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r_shadow.c

/*
Terminology: Stencil Shadow Volume (sometimes called Stencil Shadows)
An extrusion of the lit faces, beginning at the original geometry and ending
further from the light source than the original geometry (presumably at least
as far as the light's radius, if the light has a radius at all), capped at
both front and back to avoid any problems (extrusion from dark faces also
works but has a different set of problems)

This is normally rendered using Carmack's Reverse technique, in which
backfaces behind zbuffer (zfail) increment the stencil, and frontfaces behind
zbuffer (zfail) decrement the stencil, the result is a stencil value of zero
where shadows did not intersect the visible geometry, suitable as a stencil
mask for rendering lighting everywhere but shadow.

In our case to hopefully avoid the Creative Labs patent, we draw the backfaces
as decrement and the frontfaces as increment, and we redefine the DepthFunc to
GL_LESS (the patent uses GL_GEQUAL) which causes zfail when behind surfaces
and zpass when infront (the patent draws where zpass with a GL_GEQUAL test),
additionally we clear stencil to 128 to avoid the need for the unclamped
incr/decr extension (not related to patent).

Patent warning:
This algorithm may be covered by Creative's patent (US Patent #6384822),
however that patent is quite specific about increment on backfaces and
decrement on frontfaces where zpass with GL_GEQUAL depth test, which is
opposite this implementation and partially opposite Carmack's Reverse paper
(which uses GL_LESS, but increments on backfaces and decrements on frontfaces).



Terminology: Stencil Light Volume (sometimes called Light Volumes)
Similar to a Stencil Shadow Volume, but inverted; rather than containing the
areas in shadow it contains the areas in light, this can only be built
quickly for certain limited cases (such as portal visibility from a point),
but is quite useful for some effects (sunlight coming from sky polygons is
one possible example, translucent occluders is another example).



Terminology: Optimized Stencil Shadow Volume
A Stencil Shadow Volume that has been processed sufficiently to ensure it has
no duplicate coverage of areas (no need to shadow an area twice), often this
greatly improves performance but is an operation too costly to use on moving
lights (however completely optimal Stencil Light Volumes can be constructed
in some ideal cases).



Terminology: Per Pixel Lighting (sometimes abbreviated PPL)
Per pixel evaluation of lighting equations, at a bare minimum this involves
DOT3 shading of diffuse lighting (per pixel dotproduct of negated incidence
vector and surface normal, using a texture of the surface bumps, called a
NormalMap) if supported by hardware; in our case there is support for cards
which are incapable of DOT3, the quality is quite poor however.  Additionally
it is desirable to have specular evaluation per pixel, per vertex
normalization of specular halfangle vectors causes noticable distortion but
is unavoidable on hardware without GL_ARB_fragment_program or
GL_ARB_fragment_shader.



Terminology: Normalization CubeMap
A cubemap containing normalized dot3-encoded (vectors of length 1 or less
encoded as RGB colors) for any possible direction, this technique allows per
pixel calculation of incidence vector for per pixel lighting purposes, which
would not otherwise be possible per pixel without GL_ARB_fragment_program or
GL_ARB_fragment_shader.



Terminology: 2D+1D Attenuation Texturing
A very crude approximation of light attenuation with distance which results
in cylindrical light shapes which fade vertically as a streak (some games
such as Doom3 allow this to be rotated to be less noticable in specific
cases), the technique is simply modulating lighting by two 2D textures (which
can be the same) on different axes of projection (XY and Z, typically), this
is the second best technique available without 3D Attenuation Texturing,
GL_ARB_fragment_program or GL_ARB_fragment_shader technology.



Terminology: 2D+1D Inverse Attenuation Texturing
A clever method described in papers on the Abducted engine, this has a squared
distance texture (bright on the outside, black in the middle), which is used
twice using GL_ADD blending, the result of this is used in an inverse modulate
(GL_ONE_MINUS_DST_ALPHA, GL_ZERO) to implement the equation
lighting*=(1-((X*X+Y*Y)+(Z*Z))) which is spherical (unlike 2D+1D attenuation
texturing).



Terminology: 3D Attenuation Texturing
A slightly crude approximation of light attenuation with distance, its flaws
are limited radius and resolution (performance tradeoffs).



Terminology: 3D Attenuation-Normalization Texturing
A 3D Attenuation Texture merged with a Normalization CubeMap, by making the
vectors shorter the lighting becomes darker, a very effective optimization of
diffuse lighting if 3D Attenuation Textures are already used.



Terminology: Light Cubemap Filtering
A technique for modeling non-uniform light distribution according to
direction, for example a lantern may use a cubemap to describe the light
emission pattern of the cage around the lantern (as well as soot buildup
discoloring the light in certain areas), often also used for softened grate
shadows and light shining through a stained glass window (done crudely by
texturing the lighting with a cubemap), another good example would be a disco
light.  This technique is used heavily in many games (Doom3 does not support
this however).



Terminology: Light Projection Filtering
A technique for modeling shadowing of light passing through translucent
surfaces, allowing stained glass windows and other effects to be done more
elegantly than possible with Light Cubemap Filtering by applying an occluder
texture to the lighting combined with a stencil light volume to limit the lit
area, this technique is used by Doom3 for spotlights and flashlights, among
other things, this can also be used more generally to render light passing
through multiple translucent occluders in a scene (using a light volume to
describe the area beyond the occluder, and thus mask off rendering of all
other areas).



Terminology: Doom3 Lighting
A combination of Stencil Shadow Volume, Per Pixel Lighting, Normalization
CubeMap, 2D+1D Attenuation Texturing, and Light Projection Filtering, as
demonstrated by the game Doom3.
*/

#include "quakedef.h"
#include "r_shadow.h"
#include "cl_collision.h"
#include "portals.h"
#include "image.h"
#include "dpsoftrast.h"

#ifdef SUPPORTD3D
#include <d3d9.h>
extern LPDIRECT3DDEVICE9 vid_d3d9dev;
#endif

extern void R_Shadow_EditLights_Init(void);

typedef enum r_shadow_rendermode_e
{
      R_SHADOW_RENDERMODE_NONE,
      R_SHADOW_RENDERMODE_ZPASS_STENCIL,
      R_SHADOW_RENDERMODE_ZPASS_SEPARATESTENCIL,
      R_SHADOW_RENDERMODE_ZPASS_STENCILTWOSIDE,
      R_SHADOW_RENDERMODE_ZFAIL_STENCIL,
      R_SHADOW_RENDERMODE_ZFAIL_SEPARATESTENCIL,
      R_SHADOW_RENDERMODE_ZFAIL_STENCILTWOSIDE,
      R_SHADOW_RENDERMODE_LIGHT_VERTEX,
      R_SHADOW_RENDERMODE_LIGHT_VERTEX2DATTEN,
      R_SHADOW_RENDERMODE_LIGHT_VERTEX2D1DATTEN,
      R_SHADOW_RENDERMODE_LIGHT_VERTEX3DATTEN,
      R_SHADOW_RENDERMODE_LIGHT_GLSL,
      R_SHADOW_RENDERMODE_VISIBLEVOLUMES,
      R_SHADOW_RENDERMODE_VISIBLELIGHTING,
      R_SHADOW_RENDERMODE_SHADOWMAP2D
}
r_shadow_rendermode_t;

typedef enum r_shadow_shadowmode_e
{
    R_SHADOW_SHADOWMODE_STENCIL,
    R_SHADOW_SHADOWMODE_SHADOWMAP2D
}
r_shadow_shadowmode_t;

r_shadow_rendermode_t r_shadow_rendermode = R_SHADOW_RENDERMODE_NONE;
r_shadow_rendermode_t r_shadow_lightingrendermode = R_SHADOW_RENDERMODE_NONE;
r_shadow_rendermode_t r_shadow_shadowingrendermode_zpass = R_SHADOW_RENDERMODE_NONE;
r_shadow_rendermode_t r_shadow_shadowingrendermode_zfail = R_SHADOW_RENDERMODE_NONE;
qboolean r_shadow_usingshadowmap2d;
qboolean r_shadow_usingshadowmaportho;
int r_shadow_shadowmapside;
float r_shadow_shadowmap_texturescale[2];
float r_shadow_shadowmap_parameters[4];
#if 0
int r_shadow_drawbuffer;
int r_shadow_readbuffer;
#endif
int r_shadow_cullface_front, r_shadow_cullface_back;
GLuint r_shadow_fbo2d;
r_shadow_shadowmode_t r_shadow_shadowmode;
int r_shadow_shadowmapfilterquality;
int r_shadow_shadowmapdepthbits;
int r_shadow_shadowmapmaxsize;
qboolean r_shadow_shadowmapvsdct;
qboolean r_shadow_shadowmapsampler;
int r_shadow_shadowmappcf;
int r_shadow_shadowmapborder;
matrix4x4_t r_shadow_shadowmapmatrix;
int r_shadow_lightscissor[4];
qboolean r_shadow_usingdeferredprepass;

int maxshadowtriangles;
int *shadowelements;

int maxshadowvertices;
float *shadowvertex3f;

int maxshadowmark;
int numshadowmark;
int *shadowmark;
int *shadowmarklist;
int shadowmarkcount;

int maxshadowsides;
int numshadowsides;
unsigned char *shadowsides;
int *shadowsideslist;

int maxvertexupdate;
int *vertexupdate;
int *vertexremap;
int vertexupdatenum;

int r_shadow_buffer_numleafpvsbytes;
unsigned char *r_shadow_buffer_visitingleafpvs;
unsigned char *r_shadow_buffer_leafpvs;
int *r_shadow_buffer_leaflist;

int r_shadow_buffer_numsurfacepvsbytes;
unsigned char *r_shadow_buffer_surfacepvs;
int *r_shadow_buffer_surfacelist;
unsigned char *r_shadow_buffer_surfacesides;

int r_shadow_buffer_numshadowtrispvsbytes;
unsigned char *r_shadow_buffer_shadowtrispvs;
int r_shadow_buffer_numlighttrispvsbytes;
unsigned char *r_shadow_buffer_lighttrispvs;

rtexturepool_t *r_shadow_texturepool;
rtexture_t *r_shadow_attenuationgradienttexture;
rtexture_t *r_shadow_attenuation2dtexture;
rtexture_t *r_shadow_attenuation3dtexture;
skinframe_t *r_shadow_lightcorona;
rtexture_t *r_shadow_shadowmap2dtexture;
rtexture_t *r_shadow_shadowmap2dcolortexture;
rtexture_t *r_shadow_shadowmapvsdcttexture;
int r_shadow_shadowmapsize; // changes for each light based on distance
int r_shadow_shadowmaplod; // changes for each light based on distance

GLuint r_shadow_prepassgeometryfbo;
GLuint r_shadow_prepasslightingdiffusespecularfbo;
GLuint r_shadow_prepasslightingdiffusefbo;
int r_shadow_prepass_width;
int r_shadow_prepass_height;
rtexture_t *r_shadow_prepassgeometrydepthtexture;
rtexture_t *r_shadow_prepassgeometrydepthcolortexture;
rtexture_t *r_shadow_prepassgeometrynormalmaptexture;
rtexture_t *r_shadow_prepasslightingdiffusetexture;
rtexture_t *r_shadow_prepasslightingspeculartexture;

// lights are reloaded when this changes
char r_shadow_mapname[MAX_QPATH];

// used only for light filters (cubemaps)
rtexturepool_t *r_shadow_filters_texturepool;

static const GLenum r_shadow_prepasslightingdrawbuffers[2] = {GL_COLOR_ATTACHMENT0_EXT, GL_COLOR_ATTACHMENT1_EXT};

cvar_t r_shadow_bumpscale_basetexture = {0, "r_shadow_bumpscale_basetexture", "0", "generate fake bumpmaps from diffuse textures at this bumpyness, try 4 to match tenebrae, higher values increase depth, requires r_restart to take effect"};
cvar_t r_shadow_bumpscale_bumpmap = {0, "r_shadow_bumpscale_bumpmap", "4", "what magnitude to interpret _bump.tga textures as, higher values increase depth, requires r_restart to take effect"};
cvar_t r_shadow_debuglight = {0, "r_shadow_debuglight", "-1", "renders only one light, for level design purposes or debugging"};
cvar_t r_shadow_deferred = {CVAR_SAVE, "r_shadow_deferred", "0", "uses image-based lighting instead of geometry-based lighting, the method used renders a depth image and a normalmap image, renders lights into separate diffuse and specular images, and then combines this into the normal rendering, requires r_shadow_shadowmapping"};
cvar_t r_shadow_deferred_8bitrange = {CVAR_SAVE, "r_shadow_deferred_8bitrange", "4", "dynamic range of image-based lighting when using 32bit color (does not apply to fp)"};
//cvar_t r_shadow_deferred_fp = {CVAR_SAVE, "r_shadow_deferred_fp", "0", "use 16bit (1) or 32bit (2) floating point for accumulation of image-based lighting"};
cvar_t r_shadow_usebihculling = {0, "r_shadow_usebihculling", "1", "use BIH (Bounding Interval Hierarchy) for culling lit surfaces instead of BSP (Binary Space Partitioning)"};
cvar_t r_shadow_usenormalmap = {CVAR_SAVE, "r_shadow_usenormalmap", "1", "enables use of directional shading on lights"};
cvar_t r_shadow_gloss = {CVAR_SAVE, "r_shadow_gloss", "1", "0 disables gloss (specularity) rendering, 1 uses gloss if textures are found, 2 forces a flat metallic specular effect on everything without textures (similar to tenebrae)"};
cvar_t r_shadow_gloss2intensity = {0, "r_shadow_gloss2intensity", "0.125", "how bright the forced flat gloss should look if r_shadow_gloss is 2"};
cvar_t r_shadow_glossintensity = {0, "r_shadow_glossintensity", "1", "how bright textured glossmaps should look if r_shadow_gloss is 1 or 2"};
cvar_t r_shadow_glossexponent = {0, "r_shadow_glossexponent", "32", "how 'sharp' the gloss should appear (specular power)"};
cvar_t r_shadow_gloss2exponent = {0, "r_shadow_gloss2exponent", "32", "same as r_shadow_glossexponent but for forced gloss (gloss 2) surfaces"};
cvar_t r_shadow_glossexact = {0, "r_shadow_glossexact", "0", "use exact reflection math for gloss (slightly slower, but should look a tad better)"};
cvar_t r_shadow_lightattenuationdividebias = {0, "r_shadow_lightattenuationdividebias", "1", "changes attenuation texture generation"};
cvar_t r_shadow_lightattenuationlinearscale = {0, "r_shadow_lightattenuationlinearscale", "2", "changes attenuation texture generation"};
cvar_t r_shadow_lightintensityscale = {0, "r_shadow_lightintensityscale", "1", "renders all world lights brighter or darker"};
cvar_t r_shadow_lightradiusscale = {0, "r_shadow_lightradiusscale", "1", "renders all world lights larger or smaller"};
cvar_t r_shadow_projectdistance = {0, "r_shadow_projectdistance", "0", "how far to cast shadows"};
cvar_t r_shadow_frontsidecasting = {0, "r_shadow_frontsidecasting", "1", "whether to cast shadows from illuminated triangles (front side of model) or unlit triangles (back side of model)"};
cvar_t r_shadow_realtime_dlight = {CVAR_SAVE, "r_shadow_realtime_dlight", "1", "enables rendering of dynamic lights such as explosions and rocket light"};
cvar_t r_shadow_realtime_dlight_shadows = {CVAR_SAVE, "r_shadow_realtime_dlight_shadows", "1", "enables rendering of shadows from dynamic lights"};
cvar_t r_shadow_realtime_dlight_svbspculling = {0, "r_shadow_realtime_dlight_svbspculling", "0", "enables svbsp optimization on dynamic lights (very slow!)"};
cvar_t r_shadow_realtime_dlight_portalculling = {0, "r_shadow_realtime_dlight_portalculling", "0", "enables portal optimization on dynamic lights (slow!)"};
cvar_t r_shadow_realtime_world = {CVAR_SAVE, "r_shadow_realtime_world", "0", "enables rendering of full world lighting (whether loaded from the map, or a .rtlights file, or a .ent file, or a .lights file produced by hlight)"};
cvar_t r_shadow_realtime_world_lightmaps = {CVAR_SAVE, "r_shadow_realtime_world_lightmaps", "0", "brightness to render lightmaps when using full world lighting, try 0.5 for a tenebrae-like appearance"};
cvar_t r_shadow_realtime_world_shadows = {CVAR_SAVE, "r_shadow_realtime_world_shadows", "1", "enables rendering of shadows from world lights"};
cvar_t r_shadow_realtime_world_compile = {0, "r_shadow_realtime_world_compile", "1", "enables compilation of world lights for higher performance rendering"};
cvar_t r_shadow_realtime_world_compileshadow = {0, "r_shadow_realtime_world_compileshadow", "1", "enables compilation of shadows from world lights for higher performance rendering"};
cvar_t r_shadow_realtime_world_compilesvbsp = {0, "r_shadow_realtime_world_compilesvbsp", "1", "enables svbsp optimization during compilation (slower than compileportalculling but more exact)"};
cvar_t r_shadow_realtime_world_compileportalculling = {0, "r_shadow_realtime_world_compileportalculling", "1", "enables portal-based culling optimization during compilation (overrides compilesvbsp)"};
cvar_t r_shadow_scissor = {0, "r_shadow_scissor", "1", "use scissor optimization of light rendering (restricts rendering to the portion of the screen affected by the light)"};
cvar_t r_shadow_shadowmapping = {CVAR_SAVE, "r_shadow_shadowmapping", "1", "enables use of shadowmapping (depth texture sampling) instead of stencil shadow volumes, requires gl_fbo 1"};
cvar_t r_shadow_shadowmapping_filterquality = {CVAR_SAVE, "r_shadow_shadowmapping_filterquality", "-1", "shadowmap filter modes: -1 = auto-select, 0 = no filtering, 1 = bilinear, 2 = bilinear 2x2 blur (fast), 3 = 3x3 blur (moderate), 4 = 4x4 blur (slow)"};
cvar_t r_shadow_shadowmapping_depthbits = {CVAR_SAVE, "r_shadow_shadowmapping_depthbits", "24", "requested minimum shadowmap texture depth bits"};
cvar_t r_shadow_shadowmapping_vsdct = {CVAR_SAVE, "r_shadow_shadowmapping_vsdct", "1", "enables use of virtual shadow depth cube texture"};
cvar_t r_shadow_shadowmapping_minsize = {CVAR_SAVE, "r_shadow_shadowmapping_minsize", "32", "shadowmap size limit"};
cvar_t r_shadow_shadowmapping_maxsize = {CVAR_SAVE, "r_shadow_shadowmapping_maxsize", "512", "shadowmap size limit"};
cvar_t r_shadow_shadowmapping_precision = {CVAR_SAVE, "r_shadow_shadowmapping_precision", "1", "makes shadowmaps have a maximum resolution of this number of pixels per light source radius unit such that, for example, at precision 0.5 a light with radius 200 will have a maximum resolution of 100 pixels"};
//cvar_t r_shadow_shadowmapping_lod_bias = {CVAR_SAVE, "r_shadow_shadowmapping_lod_bias", "16", "shadowmap size bias"};
//cvar_t r_shadow_shadowmapping_lod_scale = {CVAR_SAVE, "r_shadow_shadowmapping_lod_scale", "128", "shadowmap size scaling parameter"};
cvar_t r_shadow_shadowmapping_bordersize = {CVAR_SAVE, "r_shadow_shadowmapping_bordersize", "4", "shadowmap size bias for filtering"};
cvar_t r_shadow_shadowmapping_nearclip = {CVAR_SAVE, "r_shadow_shadowmapping_nearclip", "1", "shadowmap nearclip in world units"};
cvar_t r_shadow_shadowmapping_bias = {CVAR_SAVE, "r_shadow_shadowmapping_bias", "0.03", "shadowmap bias parameter (this is multiplied by nearclip * 1024 / lodsize)"};
cvar_t r_shadow_shadowmapping_polygonfactor = {CVAR_SAVE, "r_shadow_shadowmapping_polygonfactor", "2", "slope-dependent shadowmapping bias"};
cvar_t r_shadow_shadowmapping_polygonoffset = {CVAR_SAVE, "r_shadow_shadowmapping_polygonoffset", "0", "constant shadowmapping bias"};
cvar_t r_shadow_sortsurfaces = {0, "r_shadow_sortsurfaces", "1", "improve performance by sorting illuminated surfaces by texture"};
cvar_t r_shadow_polygonfactor = {0, "r_shadow_polygonfactor", "0", "how much to enlarge shadow volume polygons when rendering (should be 0!)"};
cvar_t r_shadow_polygonoffset = {0, "r_shadow_polygonoffset", "1", "how much to push shadow volumes into the distance when rendering, to reduce chances of zfighting artifacts (should not be less than 0)"};
cvar_t r_shadow_texture3d = {0, "r_shadow_texture3d", "1", "use 3D voxel textures for spherical attenuation rather than cylindrical (does not affect OpenGL 2.0 render path)"};
cvar_t r_shadow_bouncegrid = {CVAR_SAVE, "r_shadow_bouncegrid", "0", "perform particle tracing for indirect lighting (Global Illumination / radiosity) using a 3D texture covering the scene, only active on levels with realtime lights active (r_shadow_realtime_world is usually required for these)"};
cvar_t r_shadow_bouncegrid_bounceanglediffuse = {CVAR_SAVE, "r_shadow_bouncegrid_bounceanglediffuse", "0", "use random bounce direction rather than true reflection, makes some corner areas dark"};
cvar_t r_shadow_bouncegrid_directionalshading = {CVAR_SAVE, "r_shadow_bouncegrid_directionalshading", "0", "use diffuse shading rather than ambient, 3D texture becomes 8x as many pixels to hold the additional data"};
cvar_t r_shadow_bouncegrid_dlightparticlemultiplier = {CVAR_SAVE, "r_shadow_bouncegrid_dlightparticlemultiplier", "0", "if set to a high value like 16 this can make dlights look great, but 0 is recommended for performance reasons"};
cvar_t r_shadow_bouncegrid_hitmodels = {CVAR_SAVE, "r_shadow_bouncegrid_hitmodels", "0", "enables hitting character model geometry (SLOW)"};
cvar_t r_shadow_bouncegrid_includedirectlighting = {CVAR_SAVE, "r_shadow_bouncegrid_includedirectlighting", "0", "allows direct lighting to be recorded, not just indirect (gives an effect somewhat like r_shadow_realtime_world_lightmaps)"};
cvar_t r_shadow_bouncegrid_intensity = {CVAR_SAVE, "r_shadow_bouncegrid_intensity", "4", "overall brightness of bouncegrid texture"};
cvar_t r_shadow_bouncegrid_lightradiusscale = {CVAR_SAVE, "r_shadow_bouncegrid_lightradiusscale", "4", "particles stop at this fraction of light radius (can be more than 1)"};
cvar_t r_shadow_bouncegrid_maxbounce = {CVAR_SAVE, "r_shadow_bouncegrid_maxbounce", "2", "maximum number of bounces for a particle (minimum is 0)"};
cvar_t r_shadow_bouncegrid_particlebounceintensity = {CVAR_SAVE, "r_shadow_bouncegrid_particlebounceintensity", "1", "amount of energy carried over after each bounce, this is a multiplier of texture color and the result is clamped to 1 or less, to prevent adding energy on each bounce"};
cvar_t r_shadow_bouncegrid_particleintensity = {CVAR_SAVE, "r_shadow_bouncegrid_particleintensity", "1", "brightness of particles contributing to bouncegrid texture"};
cvar_t r_shadow_bouncegrid_photons = {CVAR_SAVE, "r_shadow_bouncegrid_photons", "2000", "total photons to shoot per update, divided proportionately between lights"};
cvar_t r_shadow_bouncegrid_spacing = {CVAR_SAVE, "r_shadow_bouncegrid_spacing", "64", "unit size of bouncegrid pixel"};
cvar_t r_shadow_bouncegrid_stablerandom = {CVAR_SAVE, "r_shadow_bouncegrid_stablerandom", "1", "make particle distribution consistent from frame to frame"};
cvar_t r_shadow_bouncegrid_static = {CVAR_SAVE, "r_shadow_bouncegrid_static", "1", "use static radiosity solution (high quality) rather than dynamic (splotchy)"};
cvar_t r_shadow_bouncegrid_static_directionalshading = {CVAR_SAVE, "r_shadow_bouncegrid_static_directionalshading", "1", "whether to use directionalshading when in static mode"};
cvar_t r_shadow_bouncegrid_static_lightradiusscale = {CVAR_SAVE, "r_shadow_bouncegrid_static_lightradiusscale", "10", "particles stop at this fraction of light radius (can be more than 1) when in static mode"};
cvar_t r_shadow_bouncegrid_static_maxbounce = {CVAR_SAVE, "r_shadow_bouncegrid_static_maxbounce", "5", "maximum number of bounces for a particle (minimum is 0) in static mode"};
cvar_t r_shadow_bouncegrid_static_photons = {CVAR_SAVE, "r_shadow_bouncegrid_static_photons", "25000", "photons value to use when in static mode"};
cvar_t r_shadow_bouncegrid_updateinterval = {CVAR_SAVE, "r_shadow_bouncegrid_updateinterval", "0", "update bouncegrid texture once per this many seconds, useful values are 0, 0.05, or 1000000"};
cvar_t r_shadow_bouncegrid_x = {CVAR_SAVE, "r_shadow_bouncegrid_x", "64", "maximum texture size of bouncegrid on X axis"};
cvar_t r_shadow_bouncegrid_y = {CVAR_SAVE, "r_shadow_bouncegrid_y", "64", "maximum texture size of bouncegrid on Y axis"};
cvar_t r_shadow_bouncegrid_z = {CVAR_SAVE, "r_shadow_bouncegrid_z", "32", "maximum texture size of bouncegrid on Z axis"};
cvar_t r_coronas = {CVAR_SAVE, "r_coronas", "1", "brightness of corona flare effects around certain lights, 0 disables corona effects"};
cvar_t r_coronas_occlusionsizescale = {CVAR_SAVE, "r_coronas_occlusionsizescale", "0.1", "size of light source for corona occlusion checksum the proportion of hidden pixels controls corona intensity"};
cvar_t r_coronas_occlusionquery = {CVAR_SAVE, "r_coronas_occlusionquery", "1", "use GL_ARB_occlusion_query extension if supported (fades coronas according to visibility)"};
cvar_t gl_flashblend = {CVAR_SAVE, "gl_flashblend", "0", "render bright coronas for dynamic lights instead of actual lighting, fast but ugly"};
cvar_t gl_ext_separatestencil = {0, "gl_ext_separatestencil", "1", "make use of OpenGL 2.0 glStencilOpSeparate or GL_ATI_separate_stencil extension"};
cvar_t gl_ext_stenciltwoside = {0, "gl_ext_stenciltwoside", "1", "make use of GL_EXT_stenciltwoside extension (NVIDIA only)"};
cvar_t r_editlights = {0, "r_editlights", "0", "enables .rtlights file editing mode"};
cvar_t r_editlights_cursordistance = {0, "r_editlights_cursordistance", "1024", "maximum distance of cursor from eye"};
cvar_t r_editlights_cursorpushback = {0, "r_editlights_cursorpushback", "0", "how far to pull the cursor back toward the eye"};
cvar_t r_editlights_cursorpushoff = {0, "r_editlights_cursorpushoff", "4", "how far to push the cursor off the impacted surface"};
cvar_t r_editlights_cursorgrid = {0, "r_editlights_cursorgrid", "4", "snaps cursor to this grid size"};
cvar_t r_editlights_quakelightsizescale = {CVAR_SAVE, "r_editlights_quakelightsizescale", "1", "changes size of light entities loaded from a map"};

00358 typedef struct r_shadow_bouncegrid_settings_s
{
      qboolean staticmode;
      qboolean bounceanglediffuse;
      qboolean directionalshading;
      qboolean includedirectlighting;
      float dlightparticlemultiplier;
      qboolean hitmodels;
      float lightradiusscale;
      int maxbounce;
      float particlebounceintensity;
      float particleintensity;
      int photons;
      float spacing[3];
      int stablerandom;
}
r_shadow_bouncegrid_settings_t;

r_shadow_bouncegrid_settings_t r_shadow_bouncegridsettings;
rtexture_t *r_shadow_bouncegridtexture;
matrix4x4_t r_shadow_bouncegridmatrix;
vec_t r_shadow_bouncegridintensity;
qboolean r_shadow_bouncegriddirectional;
static double r_shadow_bouncegridtime;
static int r_shadow_bouncegridresolution[3];
static int r_shadow_bouncegridnumpixels;
static unsigned char *r_shadow_bouncegridpixels;
static float *r_shadow_bouncegridhighpixels;

// note the table actually includes one more value, just to avoid the need to clamp the distance index due to minor math error
#define ATTENTABLESIZE 256
// 1D gradient, 2D circle and 3D sphere attenuation textures
#define ATTEN1DSIZE 32
#define ATTEN2DSIZE 64
#define ATTEN3DSIZE 32

static float r_shadow_attendividebias; // r_shadow_lightattenuationdividebias
static float r_shadow_attenlinearscale; // r_shadow_lightattenuationlinearscale
static float r_shadow_attentable[ATTENTABLESIZE+1];

rtlight_t *r_shadow_compilingrtlight;
static memexpandablearray_t r_shadow_worldlightsarray;
dlight_t *r_shadow_selectedlight;
dlight_t r_shadow_bufferlight;
vec3_t r_editlights_cursorlocation;
qboolean r_editlights_lockcursor;

extern int con_vislines;

void R_Shadow_UncompileWorldLights(void);
void R_Shadow_ClearWorldLights(void);
void R_Shadow_SaveWorldLights(void);
void R_Shadow_LoadWorldLights(void);
void R_Shadow_LoadLightsFile(void);
void R_Shadow_LoadWorldLightsFromMap_LightArghliteTyrlite(void);
void R_Shadow_EditLights_Reload_f(void);
void R_Shadow_ValidateCvars(void);
static void R_Shadow_MakeTextures(void);

#define EDLIGHTSPRSIZE              8
skinframe_t *r_editlights_sprcursor;
skinframe_t *r_editlights_sprlight;
skinframe_t *r_editlights_sprnoshadowlight;
skinframe_t *r_editlights_sprcubemaplight;
skinframe_t *r_editlights_sprcubemapnoshadowlight;
skinframe_t *r_editlights_sprselection;

void R_Shadow_SetShadowMode(void)
{
      r_shadow_shadowmapmaxsize = bound(1, r_shadow_shadowmapping_maxsize.integer, (int)vid.maxtexturesize_2d / 4);
      r_shadow_shadowmapvsdct = r_shadow_shadowmapping_vsdct.integer != 0 && vid.renderpath == RENDERPATH_GL20;
      r_shadow_shadowmapfilterquality = r_shadow_shadowmapping_filterquality.integer;
      r_shadow_shadowmapdepthbits = r_shadow_shadowmapping_depthbits.integer;
      r_shadow_shadowmapborder = bound(0, r_shadow_shadowmapping_bordersize.integer, 16);
      r_shadow_shadowmaplod = -1;
      r_shadow_shadowmapsize = 0;
      r_shadow_shadowmapsampler = false;
      r_shadow_shadowmappcf = 0;
      r_shadow_shadowmode = R_SHADOW_SHADOWMODE_STENCIL;
      if ((r_shadow_shadowmapping.integer || r_shadow_deferred.integer) && vid.support.ext_framebuffer_object)
      {
            switch(vid.renderpath)
            {
            case RENDERPATH_GL20:
                  if(r_shadow_shadowmapfilterquality < 0)
                  {
                        if(vid.support.amd_texture_texture4 || vid.support.arb_texture_gather)
                              r_shadow_shadowmappcf = 1;
                        else if(strstr(gl_vendor, "NVIDIA") || strstr(gl_renderer, "Radeon HD")) 
                        {
                              r_shadow_shadowmapsampler = vid.support.arb_shadow;
                              r_shadow_shadowmappcf = 1;
                        }
                        else if(strstr(gl_vendor, "ATI")) 
                              r_shadow_shadowmappcf = 1;
                        else 
                              r_shadow_shadowmapsampler = vid.support.arb_shadow;
                  }
                  else 
                  {
                        switch (r_shadow_shadowmapfilterquality)
                        {
                        case 1:
                              r_shadow_shadowmapsampler = vid.support.arb_shadow;
                              break;
                        case 2:
                              r_shadow_shadowmapsampler = vid.support.arb_shadow;
                              r_shadow_shadowmappcf = 1;
                              break;
                        case 3:
                              r_shadow_shadowmappcf = 1;
                              break;
                        case 4:
                              r_shadow_shadowmappcf = 2;
                              break;
                        }
                  }
                  r_shadow_shadowmode = R_SHADOW_SHADOWMODE_SHADOWMAP2D;
                  break;
            case RENDERPATH_D3D9:
            case RENDERPATH_D3D10:
            case RENDERPATH_D3D11:
            case RENDERPATH_SOFT:
                  r_shadow_shadowmapsampler = false;
                  r_shadow_shadowmappcf = 1;
                  r_shadow_shadowmode = R_SHADOW_SHADOWMODE_SHADOWMAP2D;
                  break;
            case RENDERPATH_GL11:
            case RENDERPATH_GL13:
            case RENDERPATH_GLES1:
            case RENDERPATH_GLES2:
                  break;
            }
      }
}

qboolean R_Shadow_ShadowMappingEnabled(void)
{
      switch (r_shadow_shadowmode)
      {
      case R_SHADOW_SHADOWMODE_SHADOWMAP2D:
            return true;
      default:
            return false;
      }
}

void R_Shadow_FreeShadowMaps(void)
{
      R_Shadow_SetShadowMode();

      R_Mesh_DestroyFramebufferObject(r_shadow_fbo2d);

      r_shadow_fbo2d = 0;

      if (r_shadow_shadowmap2dtexture)
            R_FreeTexture(r_shadow_shadowmap2dtexture);
      r_shadow_shadowmap2dtexture = NULL;

      if (r_shadow_shadowmap2dcolortexture)
            R_FreeTexture(r_shadow_shadowmap2dcolortexture);
      r_shadow_shadowmap2dcolortexture = NULL;

      if (r_shadow_shadowmapvsdcttexture)
            R_FreeTexture(r_shadow_shadowmapvsdcttexture);
      r_shadow_shadowmapvsdcttexture = NULL;
}

void r_shadow_start(void)
{
      // allocate vertex processing arrays
      r_shadow_bouncegridpixels = NULL;
      r_shadow_bouncegridhighpixels = NULL;
      r_shadow_bouncegridnumpixels = 0;
      r_shadow_bouncegridtexture = NULL;
      r_shadow_bouncegriddirectional = false;
      r_shadow_attenuationgradienttexture = NULL;
      r_shadow_attenuation2dtexture = NULL;
      r_shadow_attenuation3dtexture = NULL;
      r_shadow_shadowmode = R_SHADOW_SHADOWMODE_STENCIL;
      r_shadow_shadowmap2dtexture = NULL;
      r_shadow_shadowmap2dcolortexture = NULL;
      r_shadow_shadowmapvsdcttexture = NULL;
      r_shadow_shadowmapmaxsize = 0;
      r_shadow_shadowmapsize = 0;
      r_shadow_shadowmaplod = 0;
      r_shadow_shadowmapfilterquality = -1;
      r_shadow_shadowmapdepthbits = 0;
      r_shadow_shadowmapvsdct = false;
      r_shadow_shadowmapsampler = false;
      r_shadow_shadowmappcf = 0;
      r_shadow_fbo2d = 0;

      R_Shadow_FreeShadowMaps();

      r_shadow_texturepool = NULL;
      r_shadow_filters_texturepool = NULL;
      R_Shadow_ValidateCvars();
      R_Shadow_MakeTextures();
      maxshadowtriangles = 0;
      shadowelements = NULL;
      maxshadowvertices = 0;
      shadowvertex3f = NULL;
      maxvertexupdate = 0;
      vertexupdate = NULL;
      vertexremap = NULL;
      vertexupdatenum = 0;
      maxshadowmark = 0;
      numshadowmark = 0;
      shadowmark = NULL;
      shadowmarklist = NULL;
      shadowmarkcount = 0;
      maxshadowsides = 0;
      numshadowsides = 0;
      shadowsides = NULL;
      shadowsideslist = NULL;
      r_shadow_buffer_numleafpvsbytes = 0;
      r_shadow_buffer_visitingleafpvs = NULL;
      r_shadow_buffer_leafpvs = NULL;
      r_shadow_buffer_leaflist = NULL;
      r_shadow_buffer_numsurfacepvsbytes = 0;
      r_shadow_buffer_surfacepvs = NULL;
      r_shadow_buffer_surfacelist = NULL;
      r_shadow_buffer_surfacesides = NULL;
      r_shadow_buffer_numshadowtrispvsbytes = 0;
      r_shadow_buffer_shadowtrispvs = NULL;
      r_shadow_buffer_numlighttrispvsbytes = 0;
      r_shadow_buffer_lighttrispvs = NULL;

      r_shadow_usingdeferredprepass = false;
      r_shadow_prepass_width = r_shadow_prepass_height = 0;
}

static void R_Shadow_FreeDeferred(void);
void r_shadow_shutdown(void)
{
      CHECKGLERROR
      R_Shadow_UncompileWorldLights();

      R_Shadow_FreeShadowMaps();

      r_shadow_usingdeferredprepass = false;
      if (r_shadow_prepass_width)
            R_Shadow_FreeDeferred();
      r_shadow_prepass_width = r_shadow_prepass_height = 0;

      CHECKGLERROR
      r_shadow_bouncegridtexture = NULL;
      r_shadow_bouncegridpixels = NULL;
      r_shadow_bouncegridhighpixels = NULL;
      r_shadow_bouncegridnumpixels = 0;
      r_shadow_bouncegriddirectional = false;
      r_shadow_attenuationgradienttexture = NULL;
      r_shadow_attenuation2dtexture = NULL;
      r_shadow_attenuation3dtexture = NULL;
      R_FreeTexturePool(&r_shadow_texturepool);
      R_FreeTexturePool(&r_shadow_filters_texturepool);
      maxshadowtriangles = 0;
      if (shadowelements)
            Mem_Free(shadowelements);
      shadowelements = NULL;
      if (shadowvertex3f)
            Mem_Free(shadowvertex3f);
      shadowvertex3f = NULL;
      maxvertexupdate = 0;
      if (vertexupdate)
            Mem_Free(vertexupdate);
      vertexupdate = NULL;
      if (vertexremap)
            Mem_Free(vertexremap);
      vertexremap = NULL;
      vertexupdatenum = 0;
      maxshadowmark = 0;
      numshadowmark = 0;
      if (shadowmark)
            Mem_Free(shadowmark);
      shadowmark = NULL;
      if (shadowmarklist)
            Mem_Free(shadowmarklist);
      shadowmarklist = NULL;
      shadowmarkcount = 0;
      maxshadowsides = 0;
      numshadowsides = 0;
      if (shadowsides)
            Mem_Free(shadowsides);
      shadowsides = NULL;
      if (shadowsideslist)
            Mem_Free(shadowsideslist);
      shadowsideslist = NULL;
      r_shadow_buffer_numleafpvsbytes = 0;
      if (r_shadow_buffer_visitingleafpvs)
            Mem_Free(r_shadow_buffer_visitingleafpvs);
      r_shadow_buffer_visitingleafpvs = NULL;
      if (r_shadow_buffer_leafpvs)
            Mem_Free(r_shadow_buffer_leafpvs);
      r_shadow_buffer_leafpvs = NULL;
      if (r_shadow_buffer_leaflist)
            Mem_Free(r_shadow_buffer_leaflist);
      r_shadow_buffer_leaflist = NULL;
      r_shadow_buffer_numsurfacepvsbytes = 0;
      if (r_shadow_buffer_surfacepvs)
            Mem_Free(r_shadow_buffer_surfacepvs);
      r_shadow_buffer_surfacepvs = NULL;
      if (r_shadow_buffer_surfacelist)
            Mem_Free(r_shadow_buffer_surfacelist);
      r_shadow_buffer_surfacelist = NULL;
      if (r_shadow_buffer_surfacesides)
            Mem_Free(r_shadow_buffer_surfacesides);
      r_shadow_buffer_surfacesides = NULL;
      r_shadow_buffer_numshadowtrispvsbytes = 0;
      if (r_shadow_buffer_shadowtrispvs)
            Mem_Free(r_shadow_buffer_shadowtrispvs);
      r_shadow_buffer_numlighttrispvsbytes = 0;
      if (r_shadow_buffer_lighttrispvs)
            Mem_Free(r_shadow_buffer_lighttrispvs);
}

void r_shadow_newmap(void)
{
      if (r_shadow_bouncegridtexture) R_FreeTexture(r_shadow_bouncegridtexture);r_shadow_bouncegridtexture = NULL;
      if (r_shadow_lightcorona)                 R_SkinFrame_MarkUsed(r_shadow_lightcorona);
      if (r_editlights_sprcursor)               R_SkinFrame_MarkUsed(r_editlights_sprcursor);
      if (r_editlights_sprlight)                R_SkinFrame_MarkUsed(r_editlights_sprlight);
      if (r_editlights_sprnoshadowlight)        R_SkinFrame_MarkUsed(r_editlights_sprnoshadowlight);
      if (r_editlights_sprcubemaplight)         R_SkinFrame_MarkUsed(r_editlights_sprcubemaplight);
      if (r_editlights_sprcubemapnoshadowlight) R_SkinFrame_MarkUsed(r_editlights_sprcubemapnoshadowlight);
      if (r_editlights_sprselection)            R_SkinFrame_MarkUsed(r_editlights_sprselection);
      if (strncmp(cl.worldname, r_shadow_mapname, sizeof(r_shadow_mapname)))
            R_Shadow_EditLights_Reload_f();
}

void R_Shadow_Init(void)
{
      Cvar_RegisterVariable(&r_shadow_bumpscale_basetexture);
      Cvar_RegisterVariable(&r_shadow_bumpscale_bumpmap);
      Cvar_RegisterVariable(&r_shadow_usebihculling);
      Cvar_RegisterVariable(&r_shadow_usenormalmap);
      Cvar_RegisterVariable(&r_shadow_debuglight);
      Cvar_RegisterVariable(&r_shadow_deferred);
      Cvar_RegisterVariable(&r_shadow_deferred_8bitrange);
//    Cvar_RegisterVariable(&r_shadow_deferred_fp);
      Cvar_RegisterVariable(&r_shadow_gloss);
      Cvar_RegisterVariable(&r_shadow_gloss2intensity);
      Cvar_RegisterVariable(&r_shadow_glossintensity);
      Cvar_RegisterVariable(&r_shadow_glossexponent);
      Cvar_RegisterVariable(&r_shadow_gloss2exponent);
      Cvar_RegisterVariable(&r_shadow_glossexact);
      Cvar_RegisterVariable(&r_shadow_lightattenuationdividebias);
      Cvar_RegisterVariable(&r_shadow_lightattenuationlinearscale);
      Cvar_RegisterVariable(&r_shadow_lightintensityscale);
      Cvar_RegisterVariable(&r_shadow_lightradiusscale);
      Cvar_RegisterVariable(&r_shadow_projectdistance);
      Cvar_RegisterVariable(&r_shadow_frontsidecasting);
      Cvar_RegisterVariable(&r_shadow_realtime_dlight);
      Cvar_RegisterVariable(&r_shadow_realtime_dlight_shadows);
      Cvar_RegisterVariable(&r_shadow_realtime_dlight_svbspculling);
      Cvar_RegisterVariable(&r_shadow_realtime_dlight_portalculling);
      Cvar_RegisterVariable(&r_shadow_realtime_world);
      Cvar_RegisterVariable(&r_shadow_realtime_world_lightmaps);
      Cvar_RegisterVariable(&r_shadow_realtime_world_shadows);
      Cvar_RegisterVariable(&r_shadow_realtime_world_compile);
      Cvar_RegisterVariable(&r_shadow_realtime_world_compileshadow);
      Cvar_RegisterVariable(&r_shadow_realtime_world_compilesvbsp);
      Cvar_RegisterVariable(&r_shadow_realtime_world_compileportalculling);
      Cvar_RegisterVariable(&r_shadow_scissor);
      Cvar_RegisterVariable(&r_shadow_shadowmapping);
      Cvar_RegisterVariable(&r_shadow_shadowmapping_vsdct);
      Cvar_RegisterVariable(&r_shadow_shadowmapping_filterquality);
      Cvar_RegisterVariable(&r_shadow_shadowmapping_depthbits);
      Cvar_RegisterVariable(&r_shadow_shadowmapping_precision);
      Cvar_RegisterVariable(&r_shadow_shadowmapping_maxsize);
      Cvar_RegisterVariable(&r_shadow_shadowmapping_minsize);
//    Cvar_RegisterVariable(&r_shadow_shadowmapping_lod_bias);
//    Cvar_RegisterVariable(&r_shadow_shadowmapping_lod_scale);
      Cvar_RegisterVariable(&r_shadow_shadowmapping_bordersize);
      Cvar_RegisterVariable(&r_shadow_shadowmapping_nearclip);
      Cvar_RegisterVariable(&r_shadow_shadowmapping_bias);
      Cvar_RegisterVariable(&r_shadow_shadowmapping_polygonfactor);
      Cvar_RegisterVariable(&r_shadow_shadowmapping_polygonoffset);
      Cvar_RegisterVariable(&r_shadow_sortsurfaces);
      Cvar_RegisterVariable(&r_shadow_polygonfactor);
      Cvar_RegisterVariable(&r_shadow_polygonoffset);
      Cvar_RegisterVariable(&r_shadow_texture3d);
      Cvar_RegisterVariable(&r_shadow_bouncegrid);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_bounceanglediffuse);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_directionalshading);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_dlightparticlemultiplier);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_hitmodels);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_includedirectlighting);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_intensity);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_lightradiusscale);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_maxbounce);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_particlebounceintensity);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_particleintensity);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_photons);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_spacing);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_stablerandom);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_static);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_static_directionalshading);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_static_lightradiusscale);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_static_maxbounce);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_static_photons);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_updateinterval);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_x);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_y);
      Cvar_RegisterVariable(&r_shadow_bouncegrid_z);
      Cvar_RegisterVariable(&r_coronas);
      Cvar_RegisterVariable(&r_coronas_occlusionsizescale);
      Cvar_RegisterVariable(&r_coronas_occlusionquery);
      Cvar_RegisterVariable(&gl_flashblend);
      Cvar_RegisterVariable(&gl_ext_separatestencil);
      Cvar_RegisterVariable(&gl_ext_stenciltwoside);
      R_Shadow_EditLights_Init();
      Mem_ExpandableArray_NewArray(&r_shadow_worldlightsarray, r_main_mempool, sizeof(dlight_t), 128);
      maxshadowtriangles = 0;
      shadowelements = NULL;
      maxshadowvertices = 0;
      shadowvertex3f = NULL;
      maxvertexupdate = 0;
      vertexupdate = NULL;
      vertexremap = NULL;
      vertexupdatenum = 0;
      maxshadowmark = 0;
      numshadowmark = 0;
      shadowmark = NULL;
      shadowmarklist = NULL;
      shadowmarkcount = 0;
      maxshadowsides = 0;
      numshadowsides = 0;
      shadowsides = NULL;
      shadowsideslist = NULL;
      r_shadow_buffer_numleafpvsbytes = 0;
      r_shadow_buffer_visitingleafpvs = NULL;
      r_shadow_buffer_leafpvs = NULL;
      r_shadow_buffer_leaflist = NULL;
      r_shadow_buffer_numsurfacepvsbytes = 0;
      r_shadow_buffer_surfacepvs = NULL;
      r_shadow_buffer_surfacelist = NULL;
      r_shadow_buffer_surfacesides = NULL;
      r_shadow_buffer_shadowtrispvs = NULL;
      r_shadow_buffer_lighttrispvs = NULL;
      R_RegisterModule("R_Shadow", r_shadow_start, r_shadow_shutdown, r_shadow_newmap, NULL, NULL);
}

matrix4x4_t matrix_attenuationxyz =
{
      {
            {0.5, 0.0, 0.0, 0.5},
            {0.0, 0.5, 0.0, 0.5},
            {0.0, 0.0, 0.5, 0.5},
            {0.0, 0.0, 0.0, 1.0}
      }
};

matrix4x4_t matrix_attenuationz =
{
      {
            {0.0, 0.0, 0.5, 0.5},
            {0.0, 0.0, 0.0, 0.5},
            {0.0, 0.0, 0.0, 0.5},
            {0.0, 0.0, 0.0, 1.0}
      }
};

void R_Shadow_ResizeShadowArrays(int numvertices, int numtriangles, int vertscale, int triscale)
{
      numvertices = ((numvertices + 255) & ~255) * vertscale;
      numtriangles = ((numtriangles + 255) & ~255) * triscale;
      // make sure shadowelements is big enough for this volume
      if (maxshadowtriangles < numtriangles)
      {
            maxshadowtriangles = numtriangles;
            if (shadowelements)
                  Mem_Free(shadowelements);
            shadowelements = (int *)Mem_Alloc(r_main_mempool, maxshadowtriangles * sizeof(int[3]));
      }
      // make sure shadowvertex3f is big enough for this volume
      if (maxshadowvertices < numvertices)
      {
            maxshadowvertices = numvertices;
            if (shadowvertex3f)
                  Mem_Free(shadowvertex3f);
            shadowvertex3f = (float *)Mem_Alloc(r_main_mempool, maxshadowvertices * sizeof(float[3]));
      }
}

static void R_Shadow_EnlargeLeafSurfaceTrisBuffer(int numleafs, int numsurfaces, int numshadowtriangles, int numlighttriangles)
{
      int numleafpvsbytes = (((numleafs + 7) >> 3) + 255) & ~255;
      int numsurfacepvsbytes = (((numsurfaces + 7) >> 3) + 255) & ~255;
      int numshadowtrispvsbytes = (((numshadowtriangles + 7) >> 3) + 255) & ~255;
      int numlighttrispvsbytes = (((numlighttriangles + 7) >> 3) + 255) & ~255;
      if (r_shadow_buffer_numleafpvsbytes < numleafpvsbytes)
      {
            if (r_shadow_buffer_visitingleafpvs)
                  Mem_Free(r_shadow_buffer_visitingleafpvs);
            if (r_shadow_buffer_leafpvs)
                  Mem_Free(r_shadow_buffer_leafpvs);
            if (r_shadow_buffer_leaflist)
                  Mem_Free(r_shadow_buffer_leaflist);
            r_shadow_buffer_numleafpvsbytes = numleafpvsbytes;
            r_shadow_buffer_visitingleafpvs = (unsigned char *)Mem_Alloc(r_main_mempool, r_shadow_buffer_numleafpvsbytes);
            r_shadow_buffer_leafpvs = (unsigned char *)Mem_Alloc(r_main_mempool, r_shadow_buffer_numleafpvsbytes);
            r_shadow_buffer_leaflist = (int *)Mem_Alloc(r_main_mempool, r_shadow_buffer_numleafpvsbytes * 8 * sizeof(*r_shadow_buffer_leaflist));
      }
      if (r_shadow_buffer_numsurfacepvsbytes < numsurfacepvsbytes)
      {
            if (r_shadow_buffer_surfacepvs)
                  Mem_Free(r_shadow_buffer_surfacepvs);
            if (r_shadow_buffer_surfacelist)
                  Mem_Free(r_shadow_buffer_surfacelist);
            if (r_shadow_buffer_surfacesides)
                  Mem_Free(r_shadow_buffer_surfacesides);
            r_shadow_buffer_numsurfacepvsbytes = numsurfacepvsbytes;
            r_shadow_buffer_surfacepvs = (unsigned char *)Mem_Alloc(r_main_mempool, r_shadow_buffer_numsurfacepvsbytes);
            r_shadow_buffer_surfacelist = (int *)Mem_Alloc(r_main_mempool, r_shadow_buffer_numsurfacepvsbytes * 8 * sizeof(*r_shadow_buffer_surfacelist));
            r_shadow_buffer_surfacesides = (unsigned char *)Mem_Alloc(r_main_mempool, r_shadow_buffer_numsurfacepvsbytes * 8 * sizeof(*r_shadow_buffer_surfacelist));
      }
      if (r_shadow_buffer_numshadowtrispvsbytes < numshadowtrispvsbytes)
      {
            if (r_shadow_buffer_shadowtrispvs)
                  Mem_Free(r_shadow_buffer_shadowtrispvs);
            r_shadow_buffer_numshadowtrispvsbytes = numshadowtrispvsbytes;
            r_shadow_buffer_shadowtrispvs = (unsigned char *)Mem_Alloc(r_main_mempool, r_shadow_buffer_numshadowtrispvsbytes);
      }
      if (r_shadow_buffer_numlighttrispvsbytes < numlighttrispvsbytes)
      {
            if (r_shadow_buffer_lighttrispvs)
                  Mem_Free(r_shadow_buffer_lighttrispvs);
            r_shadow_buffer_numlighttrispvsbytes = numlighttrispvsbytes;
            r_shadow_buffer_lighttrispvs = (unsigned char *)Mem_Alloc(r_main_mempool, r_shadow_buffer_numlighttrispvsbytes);
      }
}

void R_Shadow_PrepareShadowMark(int numtris)
{
      // make sure shadowmark is big enough for this volume
      if (maxshadowmark < numtris)
      {
            maxshadowmark = numtris;
            if (shadowmark)
                  Mem_Free(shadowmark);
            if (shadowmarklist)
                  Mem_Free(shadowmarklist);
            shadowmark = (int *)Mem_Alloc(r_main_mempool, maxshadowmark * sizeof(*shadowmark));
            shadowmarklist = (int *)Mem_Alloc(r_main_mempool, maxshadowmark * sizeof(*shadowmarklist));
            shadowmarkcount = 0;
      }
      shadowmarkcount++;
      // if shadowmarkcount wrapped we clear the array and adjust accordingly
      if (shadowmarkcount == 0)
      {
            shadowmarkcount = 1;
            memset(shadowmark, 0, maxshadowmark * sizeof(*shadowmark));
      }
      numshadowmark = 0;
}

void R_Shadow_PrepareShadowSides(int numtris)
{
    if (maxshadowsides < numtris)
    {
        maxshadowsides = numtris;
        if (shadowsides)
                  Mem_Free(shadowsides);
            if (shadowsideslist)
                  Mem_Free(shadowsideslist);
            shadowsides = (unsigned char *)Mem_Alloc(r_main_mempool, maxshadowsides * sizeof(*shadowsides));
            shadowsideslist = (int *)Mem_Alloc(r_main_mempool, maxshadowsides * sizeof(*shadowsideslist));
      }
      numshadowsides = 0;
}

static int R_Shadow_ConstructShadowVolume_ZFail(int innumvertices, int innumtris, const int *inelement3i, const int *inneighbor3i, const float *invertex3f, int *outnumvertices, int *outelement3i, float *outvertex3f, const float *projectorigin, const float *projectdirection, float projectdistance, int numshadowmarktris, const int *shadowmarktris)
{
      int i, j;
      int outtriangles = 0, outvertices = 0;
      const int *element;
      const float *vertex;
      float ratio, direction[3], projectvector[3];

      if (projectdirection)
            VectorScale(projectdirection, projectdistance, projectvector);
      else
            VectorClear(projectvector);

      // create the vertices
      if (projectdirection)
      {
            for (i = 0;i < numshadowmarktris;i++)
            {
                  element = inelement3i + shadowmarktris[i] * 3;
                  for (j = 0;j < 3;j++)
                  {
                        if (vertexupdate[element[j]] != vertexupdatenum)
                        {
                              vertexupdate[element[j]] = vertexupdatenum;
                              vertexremap[element[j]] = outvertices;
                              vertex = invertex3f + element[j] * 3;
                              // project one copy of the vertex according to projectvector
                              VectorCopy(vertex, outvertex3f);
                              VectorAdd(vertex, projectvector, (outvertex3f + 3));
                              outvertex3f += 6;
                              outvertices += 2;
                        }
                  }
            }
      }
      else
      {
            for (i = 0;i < numshadowmarktris;i++)
            {
                  element = inelement3i + shadowmarktris[i] * 3;
                  for (j = 0;j < 3;j++)
                  {
                        if (vertexupdate[element[j]] != vertexupdatenum)
                        {
                              vertexupdate[element[j]] = vertexupdatenum;
                              vertexremap[element[j]] = outvertices;
                              vertex = invertex3f + element[j] * 3;
                              // project one copy of the vertex to the sphere radius of the light
                              // (FIXME: would projecting it to the light box be better?)
                              VectorSubtract(vertex, projectorigin, direction);
                              ratio = projectdistance / VectorLength(direction);
                              VectorCopy(vertex, outvertex3f);
                              VectorMA(projectorigin, ratio, direction, (outvertex3f + 3));
                              outvertex3f += 6;
                              outvertices += 2;
                        }
                  }
            }
      }

      if (r_shadow_frontsidecasting.integer)
      {
            for (i = 0;i < numshadowmarktris;i++)
            {
                  int remappedelement[3];
                  int markindex;
                  const int *neighbortriangle;

                  markindex = shadowmarktris[i] * 3;
                  element = inelement3i + markindex;
                  neighbortriangle = inneighbor3i + markindex;
                  // output the front and back triangles
                  outelement3i[0] = vertexremap[element[0]];
                  outelement3i[1] = vertexremap[element[1]];
                  outelement3i[2] = vertexremap[element[2]];
                  outelement3i[3] = vertexremap[element[2]] + 1;
                  outelement3i[4] = vertexremap[element[1]] + 1;
                  outelement3i[5] = vertexremap[element[0]] + 1;

                  outelement3i += 6;
                  outtriangles += 2;
                  // output the sides (facing outward from this triangle)
                  if (shadowmark[neighbortriangle[0]] != shadowmarkcount)
                  {
                        remappedelement[0] = vertexremap[element[0]];
                        remappedelement[1] = vertexremap[element[1]];
                        outelement3i[0] = remappedelement[1];
                        outelement3i[1] = remappedelement[0];
                        outelement3i[2] = remappedelement[0] + 1;
                        outelement3i[3] = remappedelement[1];
                        outelement3i[4] = remappedelement[0] + 1;
                        outelement3i[5] = remappedelement[1] + 1;

                        outelement3i += 6;
                        outtriangles += 2;
                  }
                  if (shadowmark[neighbortriangle[1]] != shadowmarkcount)
                  {
                        remappedelement[1] = vertexremap[element[1]];
                        remappedelement[2] = vertexremap[element[2]];
                        outelement3i[0] = remappedelement[2];
                        outelement3i[1] = remappedelement[1];
                        outelement3i[2] = remappedelement[1] + 1;
                        outelement3i[3] = remappedelement[2];
                        outelement3i[4] = remappedelement[1] + 1;
                        outelement3i[5] = remappedelement[2] + 1;

                        outelement3i += 6;
                        outtriangles += 2;
                  }
                  if (shadowmark[neighbortriangle[2]] != shadowmarkcount)
                  {
                        remappedelement[0] = vertexremap[element[0]];
                        remappedelement[2] = vertexremap[element[2]];
                        outelement3i[0] = remappedelement[0];
                        outelement3i[1] = remappedelement[2];
                        outelement3i[2] = remappedelement[2] + 1;
                        outelement3i[3] = remappedelement[0];
                        outelement3i[4] = remappedelement[2] + 1;
                        outelement3i[5] = remappedelement[0] + 1;

                        outelement3i += 6;
                        outtriangles += 2;
                  }
            }
      }
      else
      {
            for (i = 0;i < numshadowmarktris;i++)
            {
                  int remappedelement[3];
                  int markindex;
                  const int *neighbortriangle;

                  markindex = shadowmarktris[i] * 3;
                  element = inelement3i + markindex;
                  neighbortriangle = inneighbor3i + markindex;
                  // output the front and back triangles
                  outelement3i[0] = vertexremap[element[2]];
                  outelement3i[1] = vertexremap[element[1]];
                  outelement3i[2] = vertexremap[element[0]];
                  outelement3i[3] = vertexremap[element[0]] + 1;
                  outelement3i[4] = vertexremap[element[1]] + 1;
                  outelement3i[5] = vertexremap[element[2]] + 1;

                  outelement3i += 6;
                  outtriangles += 2;
                  // output the sides (facing outward from this triangle)
                  if (shadowmark[neighbortriangle[0]] != shadowmarkcount)
                  {
                        remappedelement[0] = vertexremap[element[0]];
                        remappedelement[1] = vertexremap[element[1]];
                        outelement3i[0] = remappedelement[0];
                        outelement3i[1] = remappedelement[1];
                        outelement3i[2] = remappedelement[1] + 1;
                        outelement3i[3] = remappedelement[0];
                        outelement3i[4] = remappedelement[1] + 1;
                        outelement3i[5] = remappedelement[0] + 1;

                        outelement3i += 6;
                        outtriangles += 2;
                  }
                  if (shadowmark[neighbortriangle[1]] != shadowmarkcount)
                  {
                        remappedelement[1] = vertexremap[element[1]];
                        remappedelement[2] = vertexremap[element[2]];
                        outelement3i[0] = remappedelement[1];
                        outelement3i[1] = remappedelement[2];
                        outelement3i[2] = remappedelement[2] + 1;
                        outelement3i[3] = remappedelement[1];
                        outelement3i[4] = remappedelement[2] + 1;
                        outelement3i[5] = remappedelement[1] + 1;

                        outelement3i += 6;
                        outtriangles += 2;
                  }
                  if (shadowmark[neighbortriangle[2]] != shadowmarkcount)
                  {
                        remappedelement[0] = vertexremap[element[0]];
                        remappedelement[2] = vertexremap[element[2]];
                        outelement3i[0] = remappedelement[2];
                        outelement3i[1] = remappedelement[0];
                        outelement3i[2] = remappedelement[0] + 1;
                        outelement3i[3] = remappedelement[2];
                        outelement3i[4] = remappedelement[0] + 1;
                        outelement3i[5] = remappedelement[2] + 1;

                        outelement3i += 6;
                        outtriangles += 2;
                  }
            }
      }
      if (outnumvertices)
            *outnumvertices = outvertices;
      return outtriangles;
}

static int R_Shadow_ConstructShadowVolume_ZPass(int innumvertices, int innumtris, const int *inelement3i, const int *inneighbor3i, const float *invertex3f, int *outnumvertices, int *outelement3i, float *outvertex3f, const float *projectorigin, const float *projectdirection, float projectdistance, int numshadowmarktris, const int *shadowmarktris)
{
      int i, j, k;
      int outtriangles = 0, outvertices = 0;
      const int *element;
      const float *vertex;
      float ratio, direction[3], projectvector[3];
      qboolean side[4];

      if (projectdirection)
            VectorScale(projectdirection, projectdistance, projectvector);
      else
            VectorClear(projectvector);

      for (i = 0;i < numshadowmarktris;i++)
      {
            int remappedelement[3];
            int markindex;
            const int *neighbortriangle;

            markindex = shadowmarktris[i] * 3;
            neighbortriangle = inneighbor3i + markindex;
            side[0] = shadowmark[neighbortriangle[0]] == shadowmarkcount;
            side[1] = shadowmark[neighbortriangle[1]] == shadowmarkcount;
            side[2] = shadowmark[neighbortriangle[2]] == shadowmarkcount;
            if (side[0] + side[1] + side[2] == 0)
                  continue;

            side[3] = side[0];
            element = inelement3i + markindex;

            // create the vertices
            for (j = 0;j < 3;j++)
            {
                  if (side[j] + side[j+1] == 0)
                        continue;
                  k = element[j];
                  if (vertexupdate[k] != vertexupdatenum)
                  {
                        vertexupdate[k] = vertexupdatenum;
                        vertexremap[k] = outvertices;
                        vertex = invertex3f + k * 3;
                        VectorCopy(vertex, outvertex3f);
                        if (projectdirection)
                        {
                              // project one copy of the vertex according to projectvector
                              VectorAdd(vertex, projectvector, (outvertex3f + 3));
                        }
                        else
                        {
                              // project one copy of the vertex to the sphere radius of the light
                              // (FIXME: would projecting it to the light box be better?)
                              VectorSubtract(vertex, projectorigin, direction);
                              ratio = projectdistance / VectorLength(direction);
                              VectorMA(projectorigin, ratio, direction, (outvertex3f + 3));
                        }
                        outvertex3f += 6;
                        outvertices += 2;
                  }
            }

            // output the sides (facing outward from this triangle)
            if (!side[0])
            {
                  remappedelement[0] = vertexremap[element[0]];
                  remappedelement[1] = vertexremap[element[1]];
                  outelement3i[0] = remappedelement[1];
                  outelement3i[1] = remappedelement[0];
                  outelement3i[2] = remappedelement[0] + 1;
                  outelement3i[3] = remappedelement[1];
                  outelement3i[4] = remappedelement[0] + 1;
                  outelement3i[5] = remappedelement[1] + 1;

                  outelement3i += 6;
                  outtriangles += 2;
            }
            if (!side[1])
            {
                  remappedelement[1] = vertexremap[element[1]];
                  remappedelement[2] = vertexremap[element[2]];
                  outelement3i[0] = remappedelement[2];
                  outelement3i[1] = remappedelement[1];
                  outelement3i[2] = remappedelement[1] + 1;
                  outelement3i[3] = remappedelement[2];
                  outelement3i[4] = remappedelement[1] + 1;
                  outelement3i[5] = remappedelement[2] + 1;

                  outelement3i += 6;
                  outtriangles += 2;
            }
            if (!side[2])
            {
                  remappedelement[0] = vertexremap[element[0]];
                  remappedelement[2] = vertexremap[element[2]];
                  outelement3i[0] = remappedelement[0];
                  outelement3i[1] = remappedelement[2];
                  outelement3i[2] = remappedelement[2] + 1;
                  outelement3i[3] = remappedelement[0];
                  outelement3i[4] = remappedelement[2] + 1;
                  outelement3i[5] = remappedelement[0] + 1;

                  outelement3i += 6;
                  outtriangles += 2;
            }
      }
      if (outnumvertices)
            *outnumvertices = outvertices;
      return outtriangles;
}

void R_Shadow_MarkVolumeFromBox(int firsttriangle, int numtris, const float *invertex3f, const int *elements, const vec3_t projectorigin, const vec3_t projectdirection, const vec3_t lightmins, const vec3_t lightmaxs, const vec3_t surfacemins, const vec3_t surfacemaxs)
{
      int t, tend;
      const int *e;
      const float *v[3];
      float normal[3];
      if (!BoxesOverlap(lightmins, lightmaxs, surfacemins, surfacemaxs))
            return;
      tend = firsttriangle + numtris;
      if (BoxInsideBox(surfacemins, surfacemaxs, lightmins, lightmaxs))
      {
            // surface box entirely inside light box, no box cull
            if (projectdirection)
            {
                  for (t = firsttriangle, e = elements + t * 3;t < tend;t++, e += 3)
                  {
                        TriangleNormal(invertex3f + e[0] * 3, invertex3f + e[1] * 3, invertex3f + e[2] * 3, normal);
                        if (r_shadow_frontsidecasting.integer == (DotProduct(normal, projectdirection) < 0))
                              shadowmarklist[numshadowmark++] = t;
                  }
            }
            else
            {
                  for (t = firsttriangle, e = elements + t * 3;t < tend;t++, e += 3)
                        if (r_shadow_frontsidecasting.integer == PointInfrontOfTriangle(projectorigin, invertex3f + e[0] * 3, invertex3f + e[1] * 3, invertex3f + e[2] * 3))
                              shadowmarklist[numshadowmark++] = t;
            }
      }
      else
      {
            // surface box not entirely inside light box, cull each triangle
            if (projectdirection)
            {
                  for (t = firsttriangle, e = elements + t * 3;t < tend;t++, e += 3)
                  {
                        v[0] = invertex3f + e[0] * 3;
                        v[1] = invertex3f + e[1] * 3;
                        v[2] = invertex3f + e[2] * 3;
                        TriangleNormal(v[0], v[1], v[2], normal);
                        if (r_shadow_frontsidecasting.integer == (DotProduct(normal, projectdirection) < 0)
                         && TriangleOverlapsBox(v[0], v[1], v[2], lightmins, lightmaxs))
                              shadowmarklist[numshadowmark++] = t;
                  }
            }
            else
            {
                  for (t = firsttriangle, e = elements + t * 3;t < tend;t++, e += 3)
                  {
                        v[0] = invertex3f + e[0] * 3;
                        v[1] = invertex3f + e[1] * 3;
                        v[2] = invertex3f + e[2] * 3;
                        if (r_shadow_frontsidecasting.integer == PointInfrontOfTriangle(projectorigin, v[0], v[1], v[2])
                         && TriangleOverlapsBox(v[0], v[1], v[2], lightmins, lightmaxs))
                              shadowmarklist[numshadowmark++] = t;
                  }
            }
      }
}

qboolean R_Shadow_UseZPass(vec3_t mins, vec3_t maxs)
{
#if 1
      return false;
#else
      if (r_shadow_compilingrtlight || !r_shadow_frontsidecasting.integer || !r_shadow_usezpassifpossible.integer)
            return false;
      // check if the shadow volume intersects the near plane
      //
      // a ray between the eye and light origin may intersect the caster,
      // indicating that the shadow may touch the eye location, however we must
      // test the near plane (a polygon), not merely the eye location, so it is
      // easiest to enlarge the caster bounding shape slightly for this.
      // TODO
      return true;
#endif
}

void R_Shadow_VolumeFromList(int numverts, int numtris, const float *invertex3f, const int *elements, const int *neighbors, const vec3_t projectorigin, const vec3_t projectdirection, float projectdistance, int nummarktris, const int *marktris, vec3_t trismins, vec3_t trismaxs)
{
      int i, tris, outverts;
      if (projectdistance < 0.1)
      {
            Con_Printf("R_Shadow_Volume: projectdistance %f\n", projectdistance);
            return;
      }
      if (!numverts || !nummarktris)
            return;
      // make sure shadowelements is big enough for this volume
      if (maxshadowtriangles < nummarktris*8 || maxshadowvertices < numverts*2)
            R_Shadow_ResizeShadowArrays(numverts, nummarktris, 2, 8);

      if (maxvertexupdate < numverts)
      {
            maxvertexupdate = numverts;
            if (vertexupdate)
                  Mem_Free(vertexupdate);
            if (vertexremap)
                  Mem_Free(vertexremap);
            vertexupdate = (int *)Mem_Alloc(r_main_mempool, maxvertexupdate * sizeof(int));
            vertexremap = (int *)Mem_Alloc(r_main_mempool, maxvertexupdate * sizeof(int));
            vertexupdatenum = 0;
      }
      vertexupdatenum++;
      if (vertexupdatenum == 0)
      {
            vertexupdatenum = 1;
            memset(vertexupdate, 0, maxvertexupdate * sizeof(int));
            memset(vertexremap, 0, maxvertexupdate * sizeof(int));
      }

      for (i = 0;i < nummarktris;i++)
            shadowmark[marktris[i]] = shadowmarkcount;

      if (r_shadow_compilingrtlight)
      {
            // if we're compiling an rtlight, capture the mesh
            //tris = R_Shadow_ConstructShadowVolume_ZPass(numverts, numtris, elements, neighbors, invertex3f, &outverts, shadowelements, shadowvertex3f, projectorigin, projectdirection, projectdistance, nummarktris, marktris);
            //Mod_ShadowMesh_AddMesh(r_main_mempool, r_shadow_compilingrtlight->static_meshchain_shadow_zpass, NULL, NULL, NULL, shadowvertex3f, NULL, NULL, NULL, NULL, tris, shadowelements);
            tris = R_Shadow_ConstructShadowVolume_ZFail(numverts, numtris, elements, neighbors, invertex3f, &outverts, shadowelements, shadowvertex3f, projectorigin, projectdirection, projectdistance, nummarktris, marktris);
            Mod_ShadowMesh_AddMesh(r_main_mempool, r_shadow_compilingrtlight->static_meshchain_shadow_zfail, NULL, NULL, NULL, shadowvertex3f, NULL, NULL, NULL, NULL, tris, shadowelements);
      }
      else if (r_shadow_rendermode == R_SHADOW_RENDERMODE_VISIBLEVOLUMES)
      {
            tris = R_Shadow_ConstructShadowVolume_ZFail(numverts, numtris, elements, neighbors, invertex3f, &outverts, shadowelements, shadowvertex3f, projectorigin, projectdirection, projectdistance, nummarktris, marktris);
            R_Mesh_PrepareVertices_Vertex3f(outverts, shadowvertex3f, NULL);
            R_Mesh_Draw(0, outverts, 0, tris, shadowelements, NULL, 0, NULL, NULL, 0);
      }
      else
      {
            // decide which type of shadow to generate and set stencil mode
            R_Shadow_RenderMode_StencilShadowVolumes(R_Shadow_UseZPass(trismins, trismaxs));
            // generate the sides or a solid volume, depending on type
            if (r_shadow_rendermode >= R_SHADOW_RENDERMODE_ZPASS_STENCIL && r_shadow_rendermode <= R_SHADOW_RENDERMODE_ZPASS_STENCILTWOSIDE)
                  tris = R_Shadow_ConstructShadowVolume_ZPass(numverts, numtris, elements, neighbors, invertex3f, &outverts, shadowelements, shadowvertex3f, projectorigin, projectdirection, projectdistance, nummarktris, marktris);
            else
                  tris = R_Shadow_ConstructShadowVolume_ZFail(numverts, numtris, elements, neighbors, invertex3f, &outverts, shadowelements, shadowvertex3f, projectorigin, projectdirection, projectdistance, nummarktris, marktris);
            r_refdef.stats.lights_dynamicshadowtriangles += tris;
            r_refdef.stats.lights_shadowtriangles += tris;
            if (r_shadow_rendermode == R_SHADOW_RENDERMODE_ZPASS_STENCIL)
            {
                  // increment stencil if frontface is infront of depthbuffer
                  GL_CullFace(r_refdef.view.cullface_front);
                  R_SetStencil(true, 255, GL_KEEP, GL_KEEP, GL_DECR, GL_ALWAYS, 128, 255);
                  R_Mesh_Draw(0, outverts, 0, tris, shadowelements, NULL, 0, NULL, NULL, 0);
                  // decrement stencil if backface is infront of depthbuffer
                  GL_CullFace(r_refdef.view.cullface_back);
                  R_SetStencil(true, 255, GL_KEEP, GL_KEEP, GL_INCR, GL_ALWAYS, 128, 255);
            }
            else if (r_shadow_rendermode == R_SHADOW_RENDERMODE_ZFAIL_STENCIL)
            {
                  // decrement stencil if backface is behind depthbuffer
                  GL_CullFace(r_refdef.view.cullface_front);
                  R_SetStencil(true, 255, GL_KEEP, GL_DECR, GL_KEEP, GL_ALWAYS, 128, 255);
                  R_Mesh_Draw(0, outverts, 0, tris, shadowelements, NULL, 0, NULL, NULL, 0);
                  // increment stencil if frontface is behind depthbuffer
                  GL_CullFace(r_refdef.view.cullface_back);
                  R_SetStencil(true, 255, GL_KEEP, GL_INCR, GL_KEEP, GL_ALWAYS, 128, 255);
            }
            R_Mesh_PrepareVertices_Vertex3f(outverts, shadowvertex3f, NULL);
            R_Mesh_Draw(0, outverts, 0, tris, shadowelements, NULL, 0, NULL, NULL, 0);
      }
}

int R_Shadow_CalcTriangleSideMask(const vec3_t p1, const vec3_t p2, const vec3_t p3, float bias)
{
    // p1, p2, p3 are in the cubemap's local coordinate system
    // bias = border/(size - border)
      int mask = 0x3F;

    float dp1 = p1[0] + p1[1], dn1 = p1[0] - p1[1], ap1 = fabs(dp1), an1 = fabs(dn1),
        dp2 = p2[0] + p2[1], dn2 = p2[0] - p2[1], ap2 = fabs(dp2), an2 = fabs(dn2),
        dp3 = p3[0] + p3[1], dn3 = p3[0] - p3[1], ap3 = fabs(dp3), an3 = fabs(dn3);
      if(ap1 > bias*an1 && ap2 > bias*an2 && ap3 > bias*an3)
      mask &= (3<<4)
                  | (dp1 >= 0 ? (1<<0)|(1<<2) : (2<<0)|(2<<2))
                  | (dp2 >= 0 ? (1<<0)|(1<<2) : (2<<0)|(2<<2))
                  | (dp3 >= 0 ? (1<<0)|(1<<2) : (2<<0)|(2<<2));
    if(an1 > bias*ap1 && an2 > bias*ap2 && an3 > bias*ap3)
        mask &= (3<<4)
            | (dn1 >= 0 ? (1<<0)|(2<<2) : (2<<0)|(1<<2))
            | (dn2 >= 0 ? (1<<0)|(2<<2) : (2<<0)|(1<<2))            
            | (dn3 >= 0 ? (1<<0)|(2<<2) : (2<<0)|(1<<2));

    dp1 = p1[1] + p1[2], dn1 = p1[1] - p1[2], ap1 = fabs(dp1), an1 = fabs(dn1),
    dp2 = p2[1] + p2[2], dn2 = p2[1] - p2[2], ap2 = fabs(dp2), an2 = fabs(dn2),
    dp3 = p3[1] + p3[2], dn3 = p3[1] - p3[2], ap3 = fabs(dp3), an3 = fabs(dn3);
    if(ap1 > bias*an1 && ap2 > bias*an2 && ap3 > bias*an3)
        mask &= (3<<0)
            | (dp1 >= 0 ? (1<<2)|(1<<4) : (2<<2)|(2<<4))
            | (dp2 >= 0 ? (1<<2)|(1<<4) : (2<<2)|(2<<4))            
            | (dp3 >= 0 ? (1<<2)|(1<<4) : (2<<2)|(2<<4));
    if(an1 > bias*ap1 && an2 > bias*ap2 && an3 > bias*ap3)
        mask &= (3<<0)
            | (dn1 >= 0 ? (1<<2)|(2<<4) : (2<<2)|(1<<4))
            | (dn2 >= 0 ? (1<<2)|(2<<4) : (2<<2)|(1<<4))
            | (dn3 >= 0 ? (1<<2)|(2<<4) : (2<<2)|(1<<4));

    dp1 = p1[2] + p1[0], dn1 = p1[2] - p1[0], ap1 = fabs(dp1), an1 = fabs(dn1),
    dp2 = p2[2] + p2[0], dn2 = p2[2] - p2[0], ap2 = fabs(dp2), an2 = fabs(dn2),
    dp3 = p3[2] + p3[0], dn3 = p3[2] - p3[0], ap3 = fabs(dp3), an3 = fabs(dn3);
    if(ap1 > bias*an1 && ap2 > bias*an2 && ap3 > bias*an3)
        mask &= (3<<2)
            | (dp1 >= 0 ? (1<<4)|(1<<0) : (2<<4)|(2<<0))
            | (dp2 >= 0 ? (1<<4)|(1<<0) : (2<<4)|(2<<0))
            | (dp3 >= 0 ? (1<<4)|(1<<0) : (2<<4)|(2<<0));
    if(an1 > bias*ap1 && an2 > bias*ap2 && an3 > bias*ap3)
        mask &= (3<<2)
            | (dn1 >= 0 ? (1<<4)|(2<<0) : (2<<4)|(1<<0))
            | (dn2 >= 0 ? (1<<4)|(2<<0) : (2<<4)|(1<<0))
            | (dn3 >= 0 ? (1<<4)|(2<<0) : (2<<4)|(1<<0));

      return mask;
}

int R_Shadow_CalcBBoxSideMask(const vec3_t mins, const vec3_t maxs, const matrix4x4_t *worldtolight, const matrix4x4_t *radiustolight, float bias)
{
      vec3_t center, radius, lightcenter, lightradius, pmin, pmax;
      float dp1, dn1, ap1, an1, dp2, dn2, ap2, an2;
      int mask = 0x3F;

      VectorSubtract(maxs, mins, radius);
    VectorScale(radius, 0.5f, radius);
    VectorAdd(mins, radius, center);
    Matrix4x4_Transform(worldtolight, center, lightcenter);
      Matrix4x4_Transform3x3(radiustolight, radius, lightradius);
      VectorSubtract(lightcenter, lightradius, pmin);
      VectorAdd(lightcenter, lightradius, pmax);

    dp1 = pmax[0] + pmax[1], dn1 = pmax[0] - pmin[1], ap1 = fabs(dp1), an1 = fabs(dn1),
    dp2 = pmin[0] + pmin[1], dn2 = pmin[0] - pmax[1], ap2 = fabs(dp2), an2 = fabs(dn2);
    if(ap1 > bias*an1 && ap2 > bias*an2)
        mask &= (3<<4)
            | (dp1 >= 0 ? (1<<0)|(1<<2) : (2<<0)|(2<<2))
            | (dp2 >= 0 ? (1<<0)|(1<<2) : (2<<0)|(2<<2));
    if(an1 > bias*ap1 && an2 > bias*ap2)
        mask &= (3<<4)
            | (dn1 >= 0 ? (1<<0)|(2<<2) : (2<<0)|(1<<2))
            | (dn2 >= 0 ? (1<<0)|(2<<2) : (2<<0)|(1<<2));

    dp1 = pmax[1] + pmax[2], dn1 = pmax[1] - pmin[2], ap1 = fabs(dp1), an1 = fabs(dn1),
    dp2 = pmin[1] + pmin[2], dn2 = pmin[1] - pmax[2], ap2 = fabs(dp2), an2 = fabs(dn2);
    if(ap1 > bias*an1 && ap2 > bias*an2)
        mask &= (3<<0)
            | (dp1 >= 0 ? (1<<2)|(1<<4) : (2<<2)|(2<<4))
            | (dp2 >= 0 ? (1<<2)|(1<<4) : (2<<2)|(2<<4));
    if(an1 > bias*ap1 && an2 > bias*ap2)
        mask &= (3<<0)
            | (dn1 >= 0 ? (1<<2)|(2<<4) : (2<<2)|(1<<4))
            | (dn2 >= 0 ? (1<<2)|(2<<4) : (2<<2)|(1<<4));

    dp1 = pmax[2] + pmax[0], dn1 = pmax[2] - pmin[0], ap1 = fabs(dp1), an1 = fabs(dn1),
    dp2 = pmin[2] + pmin[0], dn2 = pmin[2] - pmax[0], ap2 = fabs(dp2), an2 = fabs(dn2);
    if(ap1 > bias*an1 && ap2 > bias*an2)
        mask &= (3<<2)
            | (dp1 >= 0 ? (1<<4)|(1<<0) : (2<<4)|(2<<0))
            | (dp2 >= 0 ? (1<<4)|(1<<0) : (2<<4)|(2<<0));
    if(an1 > bias*ap1 && an2 > bias*ap2)
        mask &= (3<<2)
            | (dn1 >= 0 ? (1<<4)|(2<<0) : (2<<4)|(1<<0))
            | (dn2 >= 0 ? (1<<4)|(2<<0) : (2<<4)|(1<<0));

    return mask;
}

#define R_Shadow_CalcEntitySideMask(ent, worldtolight, radiustolight, bias) R_Shadow_CalcBBoxSideMask((ent)->mins, (ent)->maxs, worldtolight, radiustolight, bias)

int R_Shadow_CalcSphereSideMask(const vec3_t p, float radius, float bias)
{
    // p is in the cubemap's local coordinate system
    // bias = border/(size - border)
    float dxyp = p[0] + p[1], dxyn = p[0] - p[1], axyp = fabs(dxyp), axyn = fabs(dxyn);
    float dyzp = p[1] + p[2], dyzn = p[1] - p[2], ayzp = fabs(dyzp), ayzn = fabs(dyzn);
    float dzxp = p[2] + p[0], dzxn = p[2] - p[0], azxp = fabs(dzxp), azxn = fabs(dzxn);
    int mask = 0x3F;
    if(axyp > bias*axyn + radius) mask &= dxyp < 0 ? ~((1<<0)|(1<<2)) : ~((2<<0)|(2<<2));
    if(axyn > bias*axyp + radius) mask &= dxyn < 0 ? ~((1<<0)|(2<<2)) : ~((2<<0)|(1<<2));
    if(ayzp > bias*ayzn + radius) mask &= dyzp < 0 ? ~((1<<2)|(1<<4)) : ~((2<<2)|(2<<4));
    if(ayzn > bias*ayzp + radius) mask &= dyzn < 0 ? ~((1<<2)|(2<<4)) : ~((2<<2)|(1<<4));
    if(azxp > bias*azxn + radius) mask &= dzxp < 0 ? ~((1<<4)|(1<<0)) : ~((2<<4)|(2<<0));
    if(azxn > bias*azxp + radius) mask &= dzxn < 0 ? ~((1<<4)|(2<<0)) : ~((2<<4)|(1<<0));
    return mask;
}

int R_Shadow_CullFrustumSides(rtlight_t *rtlight, float size, float border)
{
      int i;
      vec3_t p, n;
      int sides = 0x3F, masks[6] = { 3<<4, 3<<4, 3<<0, 3<<0, 3<<2, 3<<2 };
      float scale = (size - 2*border)/size, len;
      float bias = border / (float)(size - border), dp, dn, ap, an;
      // check if cone enclosing side would cross frustum plane 
      scale = 2 / (scale*scale + 2);
      for (i = 0;i < 5;i++)
      {
            if (PlaneDiff(rtlight->shadoworigin, &r_refdef.view.frustum[i]) > -0.03125)
                  continue;
            Matrix4x4_Transform3x3(&rtlight->matrix_worldtolight, r_refdef.view.frustum[i].normal, n);
            len = scale*VectorLength2(n);
            if(n[0]*n[0] > len) sides &= n[0] < 0 ? ~(1<<0) : ~(2 << 0);
            if(n[1]*n[1] > len) sides &= n[1] < 0 ? ~(1<<2) : ~(2 << 2);
            if(n[2]*n[2] > len) sides &= n[2] < 0 ? ~(1<<4) : ~(2 << 4);
      }
      if (PlaneDiff(rtlight->shadoworigin, &r_refdef.view.frustum[4]) >= r_refdef.farclip - r_refdef.nearclip + 0.03125)
      {
        Matrix4x4_Transform3x3(&rtlight->matrix_worldtolight, r_refdef.view.frustum[4].normal, n);
        len = scale*VectorLength(n);
            if(n[0]*n[0] > len) sides &= n[0] >= 0 ? ~(1<<0) : ~(2 << 0);
            if(n[1]*n[1] > len) sides &= n[1] >= 0 ? ~(1<<2) : ~(2 << 2);
            if(n[2]*n[2] > len) sides &= n[2] >= 0 ? ~(1<<4) : ~(2 << 4);
      }
      // this next test usually clips off more sides than the former, but occasionally clips fewer/different ones, so do both and combine results
      // check if frustum corners/origin cross plane sides
#if 1
    // infinite version, assumes frustum corners merely give direction and extend to infinite distance
    Matrix4x4_Transform(&rtlight->matrix_worldtolight, r_refdef.view.origin, p);
    dp = p[0] + p[1], dn = p[0] - p[1], ap = fabs(dp), an = fabs(dn);
    masks[0] |= ap <= bias*an ? 0x3F : (dp >= 0 ? (1<<0)|(1<<2) : (2<<0)|(2<<2));
    masks[1] |= an <= bias*ap ? 0x3F : (dn >= 0 ? (1<<0)|(2<<2) : (2<<0)|(1<<2));
    dp = p[1] + p[2], dn = p[1] - p[2], ap = fabs(dp), an = fabs(dn);
    masks[2] |= ap <= bias*an ? 0x3F : (dp >= 0 ? (1<<2)|(1<<4) : (2<<2)|(2<<4));
    masks[3] |= an <= bias*ap ? 0x3F : (dn >= 0 ? (1<<2)|(2<<4) : (2<<2)|(1<<4));
    dp = p[2] + p[0], dn = p[2] - p[0], ap = fabs(dp), an = fabs(dn);
    masks[4] |= ap <= bias*an ? 0x3F : (dp >= 0 ? (1<<4)|(1<<0) : (2<<4)|(2<<0));
    masks[5] |= an <= bias*ap ? 0x3F : (dn >= 0 ? (1<<4)|(2<<0) : (2<<4)|(1<<0));
    for (i = 0;i < 4;i++)
    {
        Matrix4x4_Transform(&rtlight->matrix_worldtolight, r_refdef.view.frustumcorner[i], n);
        VectorSubtract(n, p, n);
        dp = n[0] + n[1], dn = n[0] - n[1], ap = fabs(dp), an = fabs(dn);
        if(ap > 0) masks[0] |= dp >= 0 ? (1<<0)|(1<<2) : (2<<0)|(2<<2);
        if(an > 0) masks[1] |= dn >= 0 ? (1<<0)|(2<<2) : (2<<0)|(1<<2);
        dp = n[1] + n[2], dn = n[1] - n[2], ap = fabs(dp), an = fabs(dn);
        if(ap > 0) masks[2] |= dp >= 0 ? (1<<2)|(1<<4) : (2<<2)|(2<<4);
        if(an > 0) masks[3] |= dn >= 0 ? (1<<2)|(2<<4) : (2<<2)|(1<<4);
        dp = n[2] + n[0], dn = n[2] - n[0], ap = fabs(dp), an = fabs(dn);
        if(ap > 0) masks[4] |= dp >= 0 ? (1<<4)|(1<<0) : (2<<4)|(2<<0);
        if(an > 0) masks[5] |= dn >= 0 ? (1<<4)|(2<<0) : (2<<4)|(1<<0);
    }
#else
    // finite version, assumes corners are a finite distance from origin dependent on far plane
      for (i = 0;i < 5;i++)
      {
            Matrix4x4_Transform(&rtlight->matrix_worldtolight, !i ? r_refdef.view.origin : r_refdef.view.frustumcorner[i-1], p);
            dp = p[0] + p[1], dn = p[0] - p[1], ap = fabs(dp), an = fabs(dn);
            masks[0] |= ap <= bias*an ? 0x3F : (dp >= 0 ? (1<<0)|(1<<2) : (2<<0)|(2<<2));
            masks[1] |= an <= bias*ap ? 0x3F : (dn >= 0 ? (1<<0)|(2<<2) : (2<<0)|(1<<2));
            dp = p[1] + p[2], dn = p[1] - p[2], ap = fabs(dp), an = fabs(dn);
            masks[2] |= ap <= bias*an ? 0x3F : (dp >= 0 ? (1<<2)|(1<<4) : (2<<2)|(2<<4));
            masks[3] |= an <= bias*ap ? 0x3F : (dn >= 0 ? (1<<2)|(2<<4) : (2<<2)|(1<<4));
            dp = p[2] + p[0], dn = p[2] - p[0], ap = fabs(dp), an = fabs(dn);
            masks[4] |= ap <= bias*an ? 0x3F : (dp >= 0 ? (1<<4)|(1<<0) : (2<<4)|(2<<0));
            masks[5] |= an <= bias*ap ? 0x3F : (dn >= 0 ? (1<<4)|(2<<0) : (2<<4)|(1<<0));
      }
#endif
      return sides & masks[0] & masks[1] & masks[2] & masks[3] & masks[4] & masks[5];
}

int R_Shadow_ChooseSidesFromBox(int firsttriangle, int numtris, const float *invertex3f, const int *elements, const matrix4x4_t *worldtolight, const vec3_t projectorigin, const vec3_t projectdirection, const vec3_t lightmins, const vec3_t lightmaxs, const vec3_t surfacemins, const vec3_t surfacemaxs, int *totals)
{
      int t, tend;
      const int *e;
      const float *v[3];
      float normal[3];
      vec3_t p[3];
      float bias;
      int mask, surfacemask = 0;
      if (!BoxesOverlap(lightmins, lightmaxs, surfacemins, surfacemaxs))
            return 0;
      bias = r_shadow_shadowmapborder / (float)(r_shadow_shadowmapmaxsize - r_shadow_shadowmapborder);
      tend = firsttriangle + numtris;
      if (BoxInsideBox(surfacemins, surfacemaxs, lightmins, lightmaxs))
      {
            // surface box entirely inside light box, no box cull
            if (projectdirection)
            {
                  for (t = firsttriangle, e = elements + t * 3;t < tend;t++, e += 3)
                  {
                        v[0] = invertex3f + e[0] * 3, v[1] = invertex3f + e[1] * 3, v[2] = invertex3f + e[2] * 3;
                        TriangleNormal(v[0], v[1], v[2], normal);
                        if (r_shadow_frontsidecasting.integer == (DotProduct(normal, projectdirection) < 0))
                        {
                              Matrix4x4_Transform(worldtolight, v[0], p[0]), Matrix4x4_Transform(worldtolight, v[1], p[1]), Matrix4x4_Transform(worldtolight, v[2], p[2]);
                              mask = R_Shadow_CalcTriangleSideMask(p[0], p[1], p[2], bias);
                              surfacemask |= mask;
                              if(totals)
                              {
                                    totals[0] += mask&1, totals[1] += (mask>>1)&1, totals[2] += (mask>>2)&1, totals[3] += (mask>>3)&1, totals[4] += (mask>>4)&1, totals[5] += mask>>5;
                                    shadowsides[numshadowsides] = mask;
                                    shadowsideslist[numshadowsides++] = t;
                              }
                        }
                  }
            }
            else
            {
                  for (t = firsttriangle, e = elements + t * 3;t < tend;t++, e += 3)
                  {
                        v[0] = invertex3f + e[0] * 3, v[1] = invertex3f + e[1] * 3, v[2] = invertex3f + e[2] * 3;
                        if (r_shadow_frontsidecasting.integer == PointInfrontOfTriangle(projectorigin, v[0], v[1], v[2]))
                        {
                              Matrix4x4_Transform(worldtolight, v[0], p[0]), Matrix4x4_Transform(worldtolight, v[1], p[1]), Matrix4x4_Transform(worldtolight, v[2], p[2]);
                              mask = R_Shadow_CalcTriangleSideMask(p[0], p[1], p[2], bias);
                              surfacemask |= mask;
                              if(totals)
                              {
                                    totals[0] += mask&1, totals[1] += (mask>>1)&1, totals[2] += (mask>>2)&1, totals[3] += (mask>>3)&1, totals[4] += (mask>>4)&1, totals[5] += mask>>5;
                                    shadowsides[numshadowsides] = mask;
                                    shadowsideslist[numshadowsides++] = t;
                              }
                        }
                  }
            }
      }
      else
      {
            // surface box not entirely inside light box, cull each triangle
            if (projectdirection)
            {
                  for (t = firsttriangle, e = elements + t * 3;t < tend;t++, e += 3)
                  {
                        v[0] = invertex3f + e[0] * 3, v[1] = invertex3f + e[1] * 3, v[2] = invertex3f + e[2] * 3;
                        TriangleNormal(v[0], v[1], v[2], normal);
                        if (r_shadow_frontsidecasting.integer == (DotProduct(normal, projectdirection) < 0)
                         && TriangleOverlapsBox(v[0], v[1], v[2], lightmins, lightmaxs))
                        {
                              Matrix4x4_Transform(worldtolight, v[0], p[0]), Matrix4x4_Transform(worldtolight, v[1], p[1]), Matrix4x4_Transform(worldtolight, v[2], p[2]);
                              mask = R_Shadow_CalcTriangleSideMask(p[0], p[1], p[2], bias);
                              surfacemask |= mask;
                              if(totals)
                              {
                                    totals[0] += mask&1, totals[1] += (mask>>1)&1, totals[2] += (mask>>2)&1, totals[3] += (mask>>3)&1, totals[4] += (mask>>4)&1, totals[5] += mask>>5;
                                    shadowsides[numshadowsides] = mask;
                                    shadowsideslist[numshadowsides++] = t;
                              }
                        }
                  }
            }
            else
            {
                  for (t = firsttriangle, e = elements + t * 3;t < tend;t++, e += 3)
                  {
                        v[0] = invertex3f + e[0] * 3, v[1] = invertex3f + e[1] * 3, v[2] = invertex3f + e[2] * 3;
                        if (r_shadow_frontsidecasting.integer == PointInfrontOfTriangle(projectorigin, v[0], v[1], v[2])
                         && TriangleOverlapsBox(v[0], v[1], v[2], lightmins, lightmaxs))
                        {
                              Matrix4x4_Transform(worldtolight, v[0], p[0]), Matrix4x4_Transform(worldtolight, v[1], p[1]), Matrix4x4_Transform(worldtolight, v[2], p[2]);
                              mask = R_Shadow_CalcTriangleSideMask(p[0], p[1], p[2], bias);
                              surfacemask |= mask;
                              if(totals)
                              {
                                    totals[0] += mask&1, totals[1] += (mask>>1)&1, totals[2] += (mask>>2)&1, totals[3] += (mask>>3)&1, totals[4] += (mask>>4)&1, totals[5] += mask>>5;
                                    shadowsides[numshadowsides] = mask;
                                    shadowsideslist[numshadowsides++] = t;
                              }
                        }
                  }
            }
      }
      return surfacemask;
}

void R_Shadow_ShadowMapFromList(int numverts, int numtris, const float *vertex3f, const int *elements, int numsidetris, const int *sidetotals, const unsigned char *sides, const int *sidetris)
{
      int i, j, outtriangles = 0;
      int *outelement3i[6];
      if (!numverts || !numsidetris || !r_shadow_compilingrtlight)
            return;
      outtriangles = sidetotals[0] + sidetotals[1] + sidetotals[2] + sidetotals[3] + sidetotals[4] + sidetotals[5];
      // make sure shadowelements is big enough for this mesh
      if (maxshadowtriangles < outtriangles)
            R_Shadow_ResizeShadowArrays(0, outtriangles, 0, 1);

      // compute the offset and size of the separate index lists for each cubemap side
      outtriangles = 0;
      for (i = 0;i < 6;i++)
      {
            outelement3i[i] = shadowelements + outtriangles * 3;
            r_shadow_compilingrtlight->static_meshchain_shadow_shadowmap->sideoffsets[i] = outtriangles;
            r_shadow_compilingrtlight->static_meshchain_shadow_shadowmap->sidetotals[i] = sidetotals[i];
            outtriangles += sidetotals[i];
      }

      // gather up the (sparse) triangles into separate index lists for each cubemap side
      for (i = 0;i < numsidetris;i++)
      {
            const int *element = elements + sidetris[i] * 3;
            for (j = 0;j < 6;j++)
            {
                  if (sides[i] & (1 << j))
                  {
                        outelement3i[j][0] = element[0];
                        outelement3i[j][1] = element[1];
                        outelement3i[j][2] = element[2];
                        outelement3i[j] += 3;
                  }
            }
      }
                  
      Mod_ShadowMesh_AddMesh(r_main_mempool, r_shadow_compilingrtlight->static_meshchain_shadow_shadowmap, NULL, NULL, NULL, vertex3f, NULL, NULL, NULL, NULL, outtriangles, shadowelements);
}

static void R_Shadow_MakeTextures_MakeCorona(void)
{
      float dx, dy;
      int x, y, a;
      unsigned char pixels[32][32][4];
      for (y = 0;y < 32;y++)
      {
            dy = (y - 15.5f) * (1.0f / 16.0f);
            for (x = 0;x < 32;x++)
            {
                  dx = (x - 15.5f) * (1.0f / 16.0f);
                  a = (int)(((1.0f / (dx * dx + dy * dy + 0.2f)) - (1.0f / (1.0f + 0.2))) * 32.0f / (1.0f / (1.0f + 0.2)));
                  a = bound(0, a, 255);
                  pixels[y][x][0] = a;
                  pixels[y][x][1] = a;
                  pixels[y][x][2] = a;
                  pixels[y][x][3] = 255;
            }
      }
      r_shadow_lightcorona = R_SkinFrame_LoadInternalBGRA("lightcorona", TEXF_FORCELINEAR, &pixels[0][0][0], 32, 32, false);
}

static unsigned int R_Shadow_MakeTextures_SamplePoint(float x, float y, float z)
{
      float dist = sqrt(x*x+y*y+z*z);
      float intensity = dist < 1 ? ((1.0f - dist) * r_shadow_lightattenuationlinearscale.value / (r_shadow_lightattenuationdividebias.value + dist*dist)) : 0;
      // note this code could suffer byte order issues except that it is multiplying by an integer that reads the same both ways
      return (unsigned char)bound(0, intensity * 256.0f, 255) * 0x01010101;
}

static void R_Shadow_MakeTextures(void)
{
      int x, y, z;
      float intensity, dist;
      unsigned int *data;
      R_Shadow_FreeShadowMaps();
      R_FreeTexturePool(&r_shadow_texturepool);
      r_shadow_texturepool = R_AllocTexturePool();
      r_shadow_attenlinearscale = r_shadow_lightattenuationlinearscale.value;
      r_shadow_attendividebias = r_shadow_lightattenuationdividebias.value;
      data = (unsigned int *)Mem_Alloc(tempmempool, max(max(ATTEN3DSIZE*ATTEN3DSIZE*ATTEN3DSIZE, ATTEN2DSIZE*ATTEN2DSIZE), ATTEN1DSIZE) * 4);
      // the table includes one additional value to avoid the need to clamp indexing due to minor math errors
      for (x = 0;x <= ATTENTABLESIZE;x++)
      {
            dist = (x + 0.5f) * (1.0f / ATTENTABLESIZE) * (1.0f / 0.9375);
            intensity = dist < 1 ? ((1.0f - dist) * r_shadow_lightattenuationlinearscale.value / (r_shadow_lightattenuationdividebias.value + dist*dist)) : 0;
            r_shadow_attentable[x] = bound(0, intensity, 1);
      }
      // 1D gradient texture
      for (x = 0;x < ATTEN1DSIZE;x++)
            data[x] = R_Shadow_MakeTextures_SamplePoint((x + 0.5f) * (1.0f / ATTEN1DSIZE) * (1.0f / 0.9375), 0, 0);
      r_shadow_attenuationgradienttexture = R_LoadTexture2D(r_shadow_texturepool, "attenuation1d", ATTEN1DSIZE, 1, (unsigned char *)data, TEXTYPE_BGRA, TEXF_CLAMP | TEXF_ALPHA | TEXF_FORCELINEAR, -1, NULL);
      // 2D circle texture
      for (y = 0;y < ATTEN2DSIZE;y++)
            for (x = 0;x < ATTEN2DSIZE;x++)
                  data[y*ATTEN2DSIZE+x] = R_Shadow_MakeTextures_SamplePoint(((x + 0.5f) * (2.0f / ATTEN2DSIZE) - 1.0f) * (1.0f / 0.9375), ((y + 0.5f) * (2.0f / ATTEN2DSIZE) - 1.0f) * (1.0f / 0.9375), 0);
      r_shadow_attenuation2dtexture = R_LoadTexture2D(r_shadow_texturepool, "attenuation2d", ATTEN2DSIZE, ATTEN2DSIZE, (unsigned char *)data, TEXTYPE_BGRA, TEXF_CLAMP | TEXF_ALPHA | TEXF_FORCELINEAR, -1, NULL);
      // 3D sphere texture
      if (r_shadow_texture3d.integer && vid.support.ext_texture_3d)
      {
            for (z = 0;z < ATTEN3DSIZE;z++)
                  for (y = 0;y < ATTEN3DSIZE;y++)
                        for (x = 0;x < ATTEN3DSIZE;x++)
                              data[(z*ATTEN3DSIZE+y)*ATTEN3DSIZE+x] = R_Shadow_MakeTextures_SamplePoint(((x + 0.5f) * (2.0f / ATTEN3DSIZE) - 1.0f) * (1.0f / 0.9375), ((y + 0.5f) * (2.0f / ATTEN3DSIZE) - 1.0f) * (1.0f / 0.9375), ((z + 0.5f) * (2.0f / ATTEN3DSIZE) - 1.0f) * (1.0f / 0.9375));
            r_shadow_attenuation3dtexture = R_LoadTexture3D(r_shadow_texturepool, "attenuation3d", ATTEN3DSIZE, ATTEN3DSIZE, ATTEN3DSIZE, (unsigned char *)data, TEXTYPE_BGRA, TEXF_CLAMP | TEXF_ALPHA | TEXF_FORCELINEAR, -1, NULL);
      }
      else
            r_shadow_attenuation3dtexture = NULL;
      Mem_Free(data);

      R_Shadow_MakeTextures_MakeCorona();

      // Editor light sprites
      r_editlights_sprcursor = R_SkinFrame_LoadInternal8bit("gfx/editlights/cursor", TEXF_ALPHA | TEXF_CLAMP, (const unsigned char *)
      "................"
      ".3............3."
      "..5...2332...5.."
      "...7.3....3.7..."
      "....7......7...."
      "...3.7....7.3..."
      "..2...7..7...2.."
      "..3..........3.."
      "..3..........3.."
      "..2...7..7...2.."
      "...3.7....7.3..."
      "....7......7...."
      "...7.3....3.7..."
      "..5...2332...5.."
      ".3............3."
      "................"
      , 16, 16, palette_bgra_embeddedpic, palette_bgra_embeddedpic);
      r_editlights_sprlight = R_SkinFrame_LoadInternal8bit("gfx/editlights/light", TEXF_ALPHA | TEXF_CLAMP, (const unsigned char *)
      "................"
      "................"
      "......1111......"
      "....11233211...."
      "...1234554321..."
      "...1356776531..."
      "..124677776421.."
      "..135777777531.."
      "..135777777531.."
      "..124677776421.."
      "...1356776531..."
      "...1234554321..."
      "....11233211...."
      "......1111......"
      "................"
      "................"
      , 16, 16, palette_bgra_embeddedpic, palette_bgra_embeddedpic);
      r_editlights_sprnoshadowlight = R_SkinFrame_LoadInternal8bit("gfx/editlights/noshadow", TEXF_ALPHA | TEXF_CLAMP, (const unsigned char *)
      "................"
      "................"
      "......1111......"
      "....11233211...."
      "...1234554321..."
      "...1356226531..."
      "..12462..26421.."
      "..1352....2531.."
      "..1352....2531.."
      "..12462..26421.."
      "...1356226531..."
      "...1234554321..."
      "....11233211...."
      "......1111......"
      "................"
      "................"
      , 16, 16, palette_bgra_embeddedpic, palette_bgra_embeddedpic);
      r_editlights_sprcubemaplight = R_SkinFrame_LoadInternal8bit("gfx/editlights/cubemaplight", TEXF_ALPHA | TEXF_CLAMP, (const unsigned char *)
      "................"
      "................"
      "......2772......"
      "....27755772...."
      "..277533335772.."
      "..753333333357.."
      "..777533335777.."
      "..735775577537.."
      "..733357753337.."
      "..733337733337.."
      "..753337733357.."
      "..277537735772.."
      "....27777772...."
      "......2772......"
      "................"
      "................"
      , 16, 16, palette_bgra_embeddedpic, palette_bgra_embeddedpic);
      r_editlights_sprcubemapnoshadowlight = R_SkinFrame_LoadInternal8bit("gfx/editlights/cubemapnoshadowlight", TEXF_ALPHA | TEXF_CLAMP, (const unsigned char *)
      "................"
      "................"
      "......2772......"
      "....27722772...."
      "..2772....2772.."
      "..72........27.."
      "..7772....2777.."
      "..7.27722772.7.."
      "..7...2772...7.."
      "..7....77....7.."
      "..72...77...27.."
      "..2772.77.2772.."
      "....27777772...."
      "......2772......"
      "................"
      "................"
      , 16, 16, palette_bgra_embeddedpic, palette_bgra_embeddedpic);
      r_editlights_sprselection = R_SkinFrame_LoadInternal8bit("gfx/editlights/selection", TEXF_ALPHA | TEXF_CLAMP, (unsigned char *)
      "................"
      ".777752..257777."
      ".742........247."
      ".72..........27."
      ".7............7."
      ".5............5."
      ".2............2."
      "................"
      "................"
      ".2............2."
      ".5............5."
      ".7............7."
      ".72..........27."
      ".742........247."
      ".777752..257777."
      "................"
      , 16, 16, palette_bgra_embeddedpic, palette_bgra_embeddedpic);
}

void R_Shadow_ValidateCvars(void)
{
      if (r_shadow_texture3d.integer && !vid.support.ext_texture_3d)
            Cvar_SetValueQuick(&r_shadow_texture3d, 0);
      if (gl_ext_separatestencil.integer && !vid.support.ati_separate_stencil)
            Cvar_SetValueQuick(&gl_ext_separatestencil, 0);
      if (gl_ext_stenciltwoside.integer && !vid.support.ext_stencil_two_side)
            Cvar_SetValueQuick(&gl_ext_stenciltwoside, 0);
}

void R_Shadow_RenderMode_Begin(void)
{
#if 0
      GLint drawbuffer;
      GLint readbuffer;
#endif
      R_Shadow_ValidateCvars();

      if (!r_shadow_attenuation2dtexture
       || (!r_shadow_attenuation3dtexture && r_shadow_texture3d.integer)
       || r_shadow_lightattenuationdividebias.value != r_shadow_attendividebias
       || r_shadow_lightattenuationlinearscale.value != r_shadow_attenlinearscale)
            R_Shadow_MakeTextures();

      CHECKGLERROR
      R_Mesh_ResetTextureState();
      GL_BlendFunc(GL_ONE, GL_ZERO);
      GL_DepthRange(0, 1);
      GL_PolygonOffset(r_refdef.polygonfactor, r_refdef.polygonoffset);
      GL_DepthTest(true);
      GL_DepthMask(false);
      GL_Color(0, 0, 0, 1);
      GL_Scissor(r_refdef.view.viewport.x, r_refdef.view.viewport.y, r_refdef.view.viewport.width, r_refdef.view.viewport.height);
      
      r_shadow_rendermode = R_SHADOW_RENDERMODE_NONE;

      if (gl_ext_separatestencil.integer && vid.support.ati_separate_stencil)
      {
            r_shadow_shadowingrendermode_zpass = R_SHADOW_RENDERMODE_ZPASS_SEPARATESTENCIL;
            r_shadow_shadowingrendermode_zfail = R_SHADOW_RENDERMODE_ZFAIL_SEPARATESTENCIL;
      }
      else if (gl_ext_stenciltwoside.integer && vid.support.ext_stencil_two_side)
      {
            r_shadow_shadowingrendermode_zpass = R_SHADOW_RENDERMODE_ZPASS_STENCILTWOSIDE;
            r_shadow_shadowingrendermode_zfail = R_SHADOW_RENDERMODE_ZFAIL_STENCILTWOSIDE;
      }
      else
      {
            r_shadow_shadowingrendermode_zpass = R_SHADOW_RENDERMODE_ZPASS_STENCIL;
            r_shadow_shadowingrendermode_zfail = R_SHADOW_RENDERMODE_ZFAIL_STENCIL;
      }

      switch(vid.renderpath)
      {
      case RENDERPATH_GL20:
      case RENDERPATH_D3D9:
      case RENDERPATH_D3D10:
      case RENDERPATH_D3D11:
      case RENDERPATH_SOFT:
      case RENDERPATH_GLES2:
            r_shadow_lightingrendermode = R_SHADOW_RENDERMODE_LIGHT_GLSL;
            break;
      case RENDERPATH_GL11:
      case RENDERPATH_GL13:
      case RENDERPATH_GLES1:
            if (r_textureunits.integer >= 2 && vid.texunits >= 2 && r_shadow_texture3d.integer && r_shadow_attenuation3dtexture)
                  r_shadow_lightingrendermode = R_SHADOW_RENDERMODE_LIGHT_VERTEX3DATTEN;
            else if (r_textureunits.integer >= 3 && vid.texunits >= 3)
                  r_shadow_lightingrendermode = R_SHADOW_RENDERMODE_LIGHT_VERTEX2D1DATTEN;
            else if (r_textureunits.integer >= 2 && vid.texunits >= 2)
                  r_shadow_lightingrendermode = R_SHADOW_RENDERMODE_LIGHT_VERTEX2DATTEN;
            else
                  r_shadow_lightingrendermode = R_SHADOW_RENDERMODE_LIGHT_VERTEX;
            break;
      }

      CHECKGLERROR
#if 0
      qglGetIntegerv(GL_DRAW_BUFFER, &drawbuffer);CHECKGLERROR
      qglGetIntegerv(GL_READ_BUFFER, &readbuffer);CHECKGLERROR
      r_shadow_drawbuffer = drawbuffer;
      r_shadow_readbuffer = readbuffer;
#endif
      r_shadow_cullface_front = r_refdef.view.cullface_front;
      r_shadow_cullface_back = r_refdef.view.cullface_back;
}

void R_Shadow_RenderMode_ActiveLight(const rtlight_t *rtlight)
{
      rsurface.rtlight = rtlight;
}

void R_Shadow_RenderMode_Reset(void)
{
      R_Mesh_SetMainRenderTargets();
      R_SetViewport(&r_refdef.view.viewport);
      GL_Scissor(r_shadow_lightscissor[0], r_shadow_lightscissor[1], r_shadow_lightscissor[2], r_shadow_lightscissor[3]);
      R_Mesh_ResetTextureState();
      GL_DepthRange(0, 1);
      GL_DepthTest(true);
      GL_DepthMask(false);
      GL_DepthFunc(GL_LEQUAL);
      GL_PolygonOffset(r_refdef.polygonfactor, r_refdef.polygonoffset);CHECKGLERROR
      r_refdef.view.cullface_front = r_shadow_cullface_front;
      r_refdef.view.cullface_back = r_shadow_cullface_back;
      GL_CullFace(r_refdef.view.cullface_back);
      GL_Color(1, 1, 1, 1);
      GL_ColorMask(r_refdef.view.colormask[0], r_refdef.view.colormask[1], r_refdef.view.colormask[2], 1);
      GL_BlendFunc(GL_ONE, GL_ZERO);
      R_SetupShader_Generic(NULL, NULL, GL_MODULATE, 1, false);
      r_shadow_usingshadowmap2d = false;
      r_shadow_usingshadowmaportho = false;
      R_SetStencil(false, 255, GL_KEEP, GL_KEEP, GL_KEEP, GL_ALWAYS, 128, 255);
}

void R_Shadow_ClearStencil(void)
{
      GL_Clear(GL_STENCIL_BUFFER_BIT, NULL, 1.0f, 128);
      r_refdef.stats.lights_clears++;
}

void R_Shadow_RenderMode_StencilShadowVolumes(qboolean zpass)
{
      r_shadow_rendermode_t mode = zpass ? r_shadow_shadowingrendermode_zpass : r_shadow_shadowingrendermode_zfail;
      if (r_shadow_rendermode == mode)
            return;
      R_Shadow_RenderMode_Reset();
      GL_DepthFunc(GL_LESS);
      GL_ColorMask(0, 0, 0, 0);
      GL_PolygonOffset(r_refdef.shadowpolygonfactor, r_refdef.shadowpolygonoffset);CHECKGLERROR
      GL_CullFace(GL_NONE);
      R_SetupShader_DepthOrShadow(false);
      r_shadow_rendermode = mode;
      switch(mode)
      {
      default:
            break;
      case R_SHADOW_RENDERMODE_ZPASS_STENCILTWOSIDE:
      case R_SHADOW_RENDERMODE_ZPASS_SEPARATESTENCIL:
            R_SetStencilSeparate(true, 255, GL_KEEP, GL_KEEP, GL_INCR, GL_KEEP, GL_KEEP, GL_DECR, GL_ALWAYS, GL_ALWAYS, 128, 255);
            break;
      case R_SHADOW_RENDERMODE_ZFAIL_STENCILTWOSIDE:
      case R_SHADOW_RENDERMODE_ZFAIL_SEPARATESTENCIL:
            R_SetStencilSeparate(true, 255, GL_KEEP, GL_INCR, GL_KEEP, GL_KEEP, GL_DECR, GL_KEEP, GL_ALWAYS, GL_ALWAYS, 128, 255);
            break;
      }
}

static void R_Shadow_MakeVSDCT(void)
{
      // maps to a 2x3 texture rectangle with normalized coordinates
      // +-
      // XX
      // YY
      // ZZ
      // stores abs(dir.xy), offset.xy/2.5
      unsigned char data[4*6] =
      {
            255, 0, 0x33, 0x33, // +X: <1, 0>, <0.5, 0.5>
            255, 0, 0x99, 0x33, // -X: <1, 0>, <1.5, 0.5>
            0, 255, 0x33, 0x99, // +Y: <0, 1>, <0.5, 1.5>
            0, 255, 0x99, 0x99, // -Y: <0, 1>, <1.5, 1.5>
            0,   0, 0x33, 0xFF, // +Z: <0, 0>, <0.5, 2.5>
            0,   0, 0x99, 0xFF, // -Z: <0, 0>, <1.5, 2.5>
      };
      r_shadow_shadowmapvsdcttexture = R_LoadTextureCubeMap(r_shadow_texturepool, "shadowmapvsdct", 1, data, TEXTYPE_RGBA, TEXF_FORCENEAREST | TEXF_CLAMP | TEXF_ALPHA, -1, NULL);
}

static void R_Shadow_MakeShadowMap(int side, int size)
{
      switch (r_shadow_shadowmode)
      {
      case R_SHADOW_SHADOWMODE_SHADOWMAP2D:
            if (r_shadow_shadowmap2dtexture) return;
            r_shadow_shadowmap2dtexture = R_LoadTextureShadowMap2D(r_shadow_texturepool, "shadowmap", size*2, size*(vid.support.arb_texture_non_power_of_two ? 3 : 4), r_shadow_shadowmapdepthbits, r_shadow_shadowmapsampler);
            r_shadow_shadowmap2dcolortexture = NULL;
            switch(vid.renderpath)
            {
#ifdef SUPPORTD3D
            case RENDERPATH_D3D9:
                  r_shadow_shadowmap2dcolortexture = R_LoadTexture2D(r_shadow_texturepool, "shadowmaprendertarget", size*2, size*(vid.support.arb_texture_non_power_of_two ? 3 : 4), NULL, TEXTYPE_BGRA, TEXF_RENDERTARGET | TEXF_FORCENEAREST | TEXF_CLAMP | TEXF_ALPHA, -1, NULL);
                  r_shadow_fbo2d = R_Mesh_CreateFramebufferObject(r_shadow_shadowmap2dtexture, r_shadow_shadowmap2dcolortexture, NULL, NULL, NULL);
                  break;
#endif
            default:
                  r_shadow_fbo2d = R_Mesh_CreateFramebufferObject(r_shadow_shadowmap2dtexture, NULL, NULL, NULL, NULL);
                  break;
            }
            break;
      default:
            return;
      }

      // render depth into the fbo, do not render color at all
      // validate the fbo now
      if (qglDrawBuffer)
      {
            int status;
            qglDrawBuffer(GL_NONE);CHECKGLERROR
            qglReadBuffer(GL_NONE);CHECKGLERROR
            status = qglCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);CHECKGLERROR
            if (status != GL_FRAMEBUFFER_COMPLETE_EXT && (r_shadow_shadowmapping.integer || r_shadow_deferred.integer))
            {
                  Con_Printf("R_Shadow_MakeShadowMap: glCheckFramebufferStatusEXT returned %i\n", status);
                  Cvar_SetValueQuick(&r_shadow_shadowmapping, 0);
                  Cvar_SetValueQuick(&r_shadow_deferred, 0);
            }
      }
}

void R_Shadow_RenderMode_ShadowMap(int side, int clear, int size)
{
      float nearclip, farclip, bias;
      r_viewport_t viewport;
      int flipped;
      GLuint fbo = 0;
      float clearcolor[4];
      nearclip = r_shadow_shadowmapping_nearclip.value / rsurface.rtlight->radius;
      farclip = 1.0f;
      bias = r_shadow_shadowmapping_bias.value * nearclip * (1024.0f / size);// * rsurface.rtlight->radius;
      r_shadow_shadowmap_parameters[1] = -nearclip * farclip / (farclip - nearclip) - 0.5f * bias;
      r_shadow_shadowmap_parameters[3] = 0.5f + 0.5f * (farclip + nearclip) / (farclip - nearclip);
      r_shadow_shadowmapside = side;
      r_shadow_shadowmapsize = size;

      r_shadow_shadowmap_parameters[0] = 0.5f * (size - r_shadow_shadowmapborder);
      r_shadow_shadowmap_parameters[2] = r_shadow_shadowmapvsdct ? 2.5f*size : size;
      R_Viewport_InitRectSideView(&viewport, &rsurface.rtlight->matrix_lighttoworld, side, size, r_shadow_shadowmapborder, nearclip, farclip, NULL);
      if (r_shadow_rendermode == R_SHADOW_RENDERMODE_SHADOWMAP2D) goto init_done;

      // complex unrolled cube approach (more flexible)
      if (r_shadow_shadowmapvsdct && !r_shadow_shadowmapvsdcttexture)
            R_Shadow_MakeVSDCT();
      if (!r_shadow_shadowmap2dtexture)
            R_Shadow_MakeShadowMap(side, r_shadow_shadowmapmaxsize);
      if (r_shadow_shadowmap2dtexture) fbo = r_shadow_fbo2d;
      r_shadow_shadowmap_texturescale[0] = 1.0f / R_TextureWidth(r_shadow_shadowmap2dtexture);
      r_shadow_shadowmap_texturescale[1] = 1.0f / R_TextureHeight(r_shadow_shadowmap2dtexture);
      r_shadow_rendermode = R_SHADOW_RENDERMODE_SHADOWMAP2D;

      R_Mesh_ResetTextureState();
      R_Shadow_RenderMode_Reset();
      R_Mesh_SetRenderTargets(fbo, r_shadow_shadowmap2dtexture, r_shadow_shadowmap2dcolortexture, NULL, NULL, NULL);
      R_SetupShader_DepthOrShadow(true);
      GL_PolygonOffset(r_shadow_shadowmapping_polygonfactor.value, r_shadow_shadowmapping_polygonoffset.value);
      GL_DepthMask(true);
      GL_DepthTest(true);

init_done:
      R_SetViewport(&viewport);
      flipped = (side & 1) ^ (side >> 2);
      r_refdef.view.cullface_front = flipped ? r_shadow_cullface_back : r_shadow_cullface_front;
      r_refdef.view.cullface_back = flipped ? r_shadow_cullface_front : r_shadow_cullface_back;
      switch(vid.renderpath)
      {
      case RENDERPATH_GL11:
      case RENDERPATH_GL13:
      case RENDERPATH_GL20:
      case RENDERPATH_SOFT:
      case RENDERPATH_GLES1:
      case RENDERPATH_GLES2:
            GL_CullFace(r_refdef.view.cullface_back);
            // OpenGL lets us scissor larger than the viewport, so go ahead and clear all views at once
            if ((clear & ((2 << side) - 1)) == (1 << side)) // only clear if the side is the first in the mask
            {
                  // get tightest scissor rectangle that encloses all viewports in the clear mask
                  int x1 = clear & 0x15 ? 0 : size;
                  int x2 = clear & 0x2A ? 2 * size : size;
                  int y1 = clear & 0x03 ? 0 : (clear & 0xC ? size : 2 * size);
                  int y2 = clear & 0x30 ? 3 * size : (clear & 0xC ? 2 * size : size);
                  GL_Scissor(x1, y1, x2 - x1, y2 - y1);
                  GL_Clear(GL_DEPTH_BUFFER_BIT, NULL, 1.0f, 0);
            }
            GL_Scissor(viewport.x, viewport.y, viewport.width, viewport.height);
            break;
      case RENDERPATH_D3D9:
      case RENDERPATH_D3D10:
      case RENDERPATH_D3D11:
            Vector4Set(clearcolor, 1,1,1,1);
            // completely different meaning than in OpenGL path
            r_shadow_shadowmap_parameters[1] = 0;
            r_shadow_shadowmap_parameters[3] = -bias;
            // we invert the cull mode because we flip the projection matrix
            // NOTE: this actually does nothing because the DrawShadowMap code sets it to doublesided...
            GL_CullFace(r_refdef.view.cullface_front);
            // D3D considers it an error to use a scissor larger than the viewport...  clear just this view
            GL_Scissor(viewport.x, viewport.y, viewport.width, viewport.height);
            if (r_shadow_shadowmapsampler)
            {
                  GL_ColorMask(0,0,0,0);
                  if (clear)
                        GL_Clear(GL_DEPTH_BUFFER_BIT, clearcolor, 1.0f, 0);
            }
            else
            {
                  GL_ColorMask(1,1,1,1);
                  if (clear)
                        GL_Clear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT, clearcolor, 1.0f, 0);
            }
            break;
      }
}

void R_Shadow_RenderMode_Lighting(qboolean stenciltest, qboolean transparent, qboolean shadowmapping)
{
      R_Mesh_ResetTextureState();
      R_Mesh_SetMainRenderTargets();
      if (transparent)
      {
            r_shadow_lightscissor[0] = r_refdef.view.viewport.x;
            r_shadow_lightscissor[1] = r_refdef.view.viewport.y;
            r_shadow_lightscissor[2] = r_refdef.view.viewport.width;
            r_shadow_lightscissor[3] = r_refdef.view.viewport.height;
      }
      R_Shadow_RenderMode_Reset();
      GL_BlendFunc(GL_SRC_ALPHA, GL_ONE);
      if (!transparent)
            GL_DepthFunc(GL_EQUAL);
      // do global setup needed for the chosen lighting mode
      if (r_shadow_rendermode == R_SHADOW_RENDERMODE_LIGHT_GLSL)
            GL_ColorMask(r_refdef.view.colormask[0], r_refdef.view.colormask[1], r_refdef.view.colormask[2], 0);
      r_shadow_usingshadowmap2d = shadowmapping;
      r_shadow_rendermode = r_shadow_lightingrendermode;
      // only draw light where this geometry was already rendered AND the
      // stencil is 128 (values other than this mean shadow)
      if (stenciltest)
            R_SetStencil(true, 255, GL_KEEP, GL_KEEP, GL_KEEP, GL_EQUAL, 128, 255);
      else
            R_SetStencil(false, 255, GL_KEEP, GL_KEEP, GL_KEEP, GL_ALWAYS, 128, 255);
}

static const unsigned short bboxelements[36] =
{
      5, 1, 3, 5, 3, 7,
      6, 2, 0, 6, 0, 4,
      7, 3, 2, 7, 2, 6,
      4, 0, 1, 4, 1, 5,
      4, 5, 7, 4, 7, 6,
      1, 0, 2, 1, 2, 3,
};

static const float bboxpoints[8][3] =
{
      {-1,-1,-1},
      { 1,-1,-1},
      {-1, 1,-1},
      { 1, 1,-1},
      {-1,-1, 1},
      { 1,-1, 1},
      {-1, 1, 1},
      { 1, 1, 1},
};

void R_Shadow_RenderMode_DrawDeferredLight(qboolean stenciltest, qboolean shadowmapping)
{
      int i;
      float vertex3f[8*3];
      const matrix4x4_t *matrix = &rsurface.rtlight->matrix_lighttoworld;
// do global setup needed for the chosen lighting mode
      R_Shadow_RenderMode_Reset();
      r_shadow_rendermode = r_shadow_lightingrendermode;
      R_EntityMatrix(&identitymatrix);
      GL_BlendFunc(GL_SRC_ALPHA, GL_ONE);
      // only draw light where this geometry was already rendered AND the
      // stencil is 128 (values other than this mean shadow)
      R_SetStencil(stenciltest, 255, GL_KEEP, GL_KEEP, GL_KEEP, GL_EQUAL, 128, 255);
      if (rsurface.rtlight->specularscale > 0 && r_shadow_gloss.integer > 0)
            R_Mesh_SetRenderTargets(r_shadow_prepasslightingdiffusespecularfbo, r_shadow_prepassgeometrydepthtexture, r_shadow_prepasslightingdiffusetexture, r_shadow_prepasslightingspeculartexture, NULL, NULL);
      else
            R_Mesh_SetRenderTargets(r_shadow_prepasslightingdiffusefbo, r_shadow_prepassgeometrydepthtexture, r_shadow_prepasslightingdiffusetexture, NULL, NULL, NULL);

      r_shadow_usingshadowmap2d = shadowmapping;

      // render the lighting
      R_SetupShader_DeferredLight(rsurface.rtlight);
      for (i = 0;i < 8;i++)
            Matrix4x4_Transform(matrix, bboxpoints[i], vertex3f + i*3);
      GL_ColorMask(1,1,1,1);
      GL_DepthMask(false);
      GL_DepthRange(0, 1);
      GL_PolygonOffset(0, 0);
      GL_DepthTest(true);
      GL_DepthFunc(GL_GREATER);
      GL_CullFace(r_refdef.view.cullface_back);
      R_Mesh_PrepareVertices_Vertex3f(8, vertex3f, NULL);
      R_Mesh_Draw(0, 8, 0, 12, NULL, NULL, 0, bboxelements, NULL, 0);
}

void R_Shadow_UpdateBounceGridTexture(void)
{
#define MAXBOUNCEGRIDPARTICLESPERLIGHT 1048576
      dlight_t *light;
      int flag = r_refdef.scene.rtworld ? LIGHTFLAG_REALTIMEMODE : LIGHTFLAG_NORMALMODE;
      int bouncecount;
      int hitsupercontentsmask;
      int maxbounce;
      int numpixels;
      int resolution[3];
      int shootparticles;
      int shotparticles;
      int photoncount;
      int tex[3];
      trace_t cliptrace;
      //trace_t cliptrace2;
      //trace_t cliptrace3;
      unsigned char *pixel;
      unsigned char *pixels;
      float *highpixel;
      float *highpixels;
      unsigned int lightindex;
      unsigned int range;
      unsigned int range1;
      unsigned int range2;
      unsigned int seed = (unsigned int)(realtime * 1000.0f);
      vec3_t shotcolor;
      vec3_t baseshotcolor;
      vec3_t surfcolor;
      vec3_t clipend;
      vec3_t clipstart;
      vec3_t clipdiff;
      vec3_t ispacing;
      vec3_t maxs;
      vec3_t mins;
      vec3_t size;
      vec3_t spacing;
      vec3_t lightcolor;
      vec3_t steppos;
      vec3_t stepdelta;
      vec3_t cullmins, cullmaxs;
      vec_t radius;
      vec_t s;
      vec_t lightintensity;
      vec_t photonscaling;
      vec_t photonresidual;
      float m[16];
      float texlerp[2][3];
      float splatcolor[32];
      float pixelweight[8];
      float w;
      int c[4];
      int pixelindex[8];
      int corner;
      int pixelsperband;
      int pixelband;
      int pixelbands;
      int numsteps;
      int step;
      int x, y, z;
      rtlight_t *rtlight;
      r_shadow_bouncegrid_settings_t settings;
      qboolean enable = r_shadow_bouncegrid.integer != 0 && r_refdef.scene.worldmodel;
      qboolean allowdirectionalshading = false;
      switch(vid.renderpath)
      {
      case RENDERPATH_GL20:
            allowdirectionalshading = true;
            if (!vid.support.ext_texture_3d)
                  return;
            break;
      case RENDERPATH_GLES2:
            // for performance reasons, do not use directional shading on GLES devices
            if (!vid.support.ext_texture_3d)
                  return;
            break;
            // these renderpaths do not currently have the code to display the bouncegrid, so disable it on them...
      case RENDERPATH_GL11:
      case RENDERPATH_GL13:
      case RENDERPATH_GLES1:
      case RENDERPATH_SOFT:
      case RENDERPATH_D3D9:
      case RENDERPATH_D3D10:
      case RENDERPATH_D3D11:
            return;
      }

      r_shadow_bouncegridintensity = r_shadow_bouncegrid_intensity.value;

      // see if there are really any lights to render...
      if (enable && r_shadow_bouncegrid_static.integer)
      {
            enable = false;
            range = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray); // checked
            for (lightindex = 0;lightindex < range;lightindex++)
            {
                  light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
                  if (!light || !(light->flags & flag))
                        continue;
                  rtlight = &light->rtlight;
                  // when static, we skip styled lights because they tend to change...
                  if (rtlight->style > 0)
                        continue;
                  VectorScale(rtlight->color, (rtlight->ambientscale + rtlight->diffusescale + rtlight->specularscale), lightcolor);
                  if (!VectorLength2(lightcolor))
                        continue;
                  enable = true;
                  break;
            }
      }

      if (!enable)
      {
            if (r_shadow_bouncegridtexture)
            {
                  R_FreeTexture(r_shadow_bouncegridtexture);
                  r_shadow_bouncegridtexture = NULL;
            }
            if (r_shadow_bouncegridpixels)
                  Mem_Free(r_shadow_bouncegridpixels);
            r_shadow_bouncegridpixels = NULL;
            if (r_shadow_bouncegridhighpixels)
                  Mem_Free(r_shadow_bouncegridhighpixels);
            r_shadow_bouncegridhighpixels = NULL;
            r_shadow_bouncegridnumpixels = 0;
            r_shadow_bouncegriddirectional = false;
            return;
      }

      // build up a complete collection of the desired settings, so that memcmp can be used to compare parameters
      memset(&settings, 0, sizeof(settings));
      settings.staticmode                    = r_shadow_bouncegrid_static.integer != 0;
      settings.bounceanglediffuse            = r_shadow_bouncegrid_bounceanglediffuse.integer != 0;
      settings.directionalshading            = (r_shadow_bouncegrid_static.integer != 0 ? r_shadow_bouncegrid_static_directionalshading.integer != 0 : r_shadow_bouncegrid_directionalshading.integer != 0) && allowdirectionalshading;
      settings.dlightparticlemultiplier      = r_shadow_bouncegrid_dlightparticlemultiplier.value;
      settings.hitmodels                     = r_shadow_bouncegrid_hitmodels.integer != 0;
      settings.includedirectlighting         = r_shadow_bouncegrid_includedirectlighting.integer != 0 || r_shadow_bouncegrid.integer == 2;
      settings.lightradiusscale              = (r_shadow_bouncegrid_static.integer != 0 ? r_shadow_bouncegrid_static_lightradiusscale.value : r_shadow_bouncegrid_lightradiusscale.value);
      settings.maxbounce                     = (r_shadow_bouncegrid_static.integer != 0 ? r_shadow_bouncegrid_static_maxbounce.integer : r_shadow_bouncegrid_maxbounce.integer);
      settings.particlebounceintensity       = r_shadow_bouncegrid_particlebounceintensity.value;
      settings.particleintensity             = r_shadow_bouncegrid_particleintensity.value * 16384.0f * (settings.directionalshading ? 4.0f : 1.0f) / (r_shadow_bouncegrid_spacing.value * r_shadow_bouncegrid_spacing.value);
      settings.photons                       = r_shadow_bouncegrid_static.integer ? r_shadow_bouncegrid_static_photons.integer : r_shadow_bouncegrid_photons.integer;
      settings.spacing[0]                    = r_shadow_bouncegrid_spacing.value;
      settings.spacing[1]                    = r_shadow_bouncegrid_spacing.value;
      settings.spacing[2]                    = r_shadow_bouncegrid_spacing.value;
      settings.stablerandom                  = r_shadow_bouncegrid_stablerandom.integer;

      // bound the values for sanity
      settings.photons = bound(1, settings.photons, 1048576);
      settings.lightradiusscale = bound(0.0001f, settings.lightradiusscale, 1024.0f);
      settings.maxbounce = bound(0, settings.maxbounce, 16);
      settings.spacing[0] = bound(1, settings.spacing[0], 512);
      settings.spacing[1] = bound(1, settings.spacing[1], 512);
      settings.spacing[2] = bound(1, settings.spacing[2], 512);

      // get the spacing values
      spacing[0] = settings.spacing[0];
      spacing[1] = settings.spacing[1];
      spacing[2] = settings.spacing[2];
      ispacing[0] = 1.0f / spacing[0];
      ispacing[1] = 1.0f / spacing[1];
      ispacing[2] = 1.0f / spacing[2];

      // calculate texture size enclosing entire world bounds at the spacing
      VectorMA(r_refdef.scene.worldmodel->normalmins, -2.0f, spacing, mins);
      VectorMA(r_refdef.scene.worldmodel->normalmaxs, 2.0f, spacing, maxs);
      VectorSubtract(maxs, mins, size);
      // now we can calculate the resolution we want
      c[0] = (int)floor(size[0] / spacing[0] + 0.5f);
      c[1] = (int)floor(size[1] / spacing[1] + 0.5f);
      c[2] = (int)floor(size[2] / spacing[2] + 0.5f);
      // figure out the exact texture size (honoring power of 2 if required)
      c[0] = bound(4, c[0], (int)vid.maxtexturesize_3d);
      c[1] = bound(4, c[1], (int)vid.maxtexturesize_3d);
      c[2] = bound(4, c[2], (int)vid.maxtexturesize_3d);
      if (vid.support.arb_texture_non_power_of_two)
      {
            resolution[0] = c[0];
            resolution[1] = c[1];
            resolution[2] = c[2];
      }
      else
      {
            for (resolution[0] = 4;resolution[0] < c[0];resolution[0]*=2) ;
            for (resolution[1] = 4;resolution[1] < c[1];resolution[1]*=2) ;
            for (resolution[2] = 4;resolution[2] < c[2];resolution[2]*=2) ;
      }
      size[0] = spacing[0] * resolution[0];
      size[1] = spacing[1] * resolution[1];
      size[2] = spacing[2] * resolution[2];

      // if dynamic we may or may not want to use the world bounds
      // if the dynamic size is smaller than the world bounds, use it instead
      if (!settings.staticmode && (r_shadow_bouncegrid_x.integer * r_shadow_bouncegrid_y.integer * r_shadow_bouncegrid_z.integer < resolution[0] * resolution[1] * resolution[2]))
      {
            // we know the resolution we want
            c[0] = r_shadow_bouncegrid_x.integer;
            c[1] = r_shadow_bouncegrid_y.integer;
            c[2] = r_shadow_bouncegrid_z.integer;
            // now we can calculate the texture size (power of 2 if required)
            c[0] = bound(4, c[0], (int)vid.maxtexturesize_3d);
            c[1] = bound(4, c[1], (int)vid.maxtexturesize_3d);
            c[2] = bound(4, c[2], (int)vid.maxtexturesize_3d);
            if (vid.support.arb_texture_non_power_of_two)
            {
                  resolution[0] = c[0];
                  resolution[1] = c[1];
                  resolution[2] = c[2];
            }
            else
            {
                  for (resolution[0] = 4;resolution[0] < c[0];resolution[0]*=2) ;
                  for (resolution[1] = 4;resolution[1] < c[1];resolution[1]*=2) ;
                  for (resolution[2] = 4;resolution[2] < c[2];resolution[2]*=2) ;
            }
            size[0] = spacing[0] * resolution[0];
            size[1] = spacing[1] * resolution[1];
            size[2] = spacing[2] * resolution[2];
            // center the rendering on the view
            mins[0] = floor(r_refdef.view.origin[0] * ispacing[0] + 0.5f) * spacing[0] - 0.5f * size[0];
            mins[1] = floor(r_refdef.view.origin[1] * ispacing[1] + 0.5f) * spacing[1] - 0.5f * size[1];
            mins[2] = floor(r_refdef.view.origin[2] * ispacing[2] + 0.5f) * spacing[2] - 0.5f * size[2];
      }

      // recalculate the maxs in case the resolution was not satisfactory
      VectorAdd(mins, size, maxs);

      // if all the settings seem identical to the previous update, return
      if (r_shadow_bouncegridtexture && (settings.staticmode || realtime < r_shadow_bouncegridtime + r_shadow_bouncegrid_updateinterval.value) && !memcmp(&r_shadow_bouncegridsettings, &settings, sizeof(settings)))
            return;

      // store the new settings
      r_shadow_bouncegridsettings = settings;

      pixelbands = settings.directionalshading ? 8 : 1;
      pixelsperband = resolution[0]*resolution[1]*resolution[2];
      numpixels = pixelsperband*pixelbands;

      // we're going to update the bouncegrid, update the matrix...
      memset(m, 0, sizeof(m));
      m[0] = 1.0f / size[0];
      m[3] = -mins[0] * m[0];
      m[5] = 1.0f / size[1];
      m[7] = -mins[1] * m[5];
      m[10] = 1.0f / size[2];
      m[11] = -mins[2] * m[10];
      m[15] = 1.0f;
      Matrix4x4_FromArrayFloatD3D(&r_shadow_bouncegridmatrix, m);
      // reallocate pixels for this update if needed...
      if (r_shadow_bouncegridnumpixels != numpixels || !r_shadow_bouncegridpixels || !r_shadow_bouncegridhighpixels)
      {
            if (r_shadow_bouncegridtexture)
            {
                  R_FreeTexture(r_shadow_bouncegridtexture);
                  r_shadow_bouncegridtexture = NULL;
            }
            r_shadow_bouncegridpixels = (unsigned char *)Mem_Realloc(r_main_mempool, r_shadow_bouncegridpixels, numpixels * sizeof(unsigned char[4]));
            r_shadow_bouncegridhighpixels = (float *)Mem_Realloc(r_main_mempool, r_shadow_bouncegridhighpixels, numpixels * sizeof(float[4]));
      }
      r_shadow_bouncegridnumpixels = numpixels;
      pixels = r_shadow_bouncegridpixels;
      highpixels = r_shadow_bouncegridhighpixels;
      x = pixelsperband*4;
      for (pixelband = 0;pixelband < pixelbands;pixelband++)
      {
            if (pixelband == 1)
                  memset(pixels + pixelband * x, 128, x);
            else
                  memset(pixels + pixelband * x, 0, x);
      }
      memset(highpixels, 0, numpixels * sizeof(float[4]));
      // figure out what we want to interact with
      if (settings.hitmodels)
            hitsupercontentsmask = SUPERCONTENTS_SOLID | SUPERCONTENTS_BODY;// | SUPERCONTENTS_LIQUIDSMASK;
      else
            hitsupercontentsmask = SUPERCONTENTS_SOLID;// | SUPERCONTENTS_LIQUIDSMASK;
      maxbounce = settings.maxbounce;
      // clear variables that produce warnings otherwise
      memset(splatcolor, 0, sizeof(splatcolor));
      // iterate world rtlights
      range = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray); // checked
      range1 = settings.staticmode ? 0 : r_refdef.scene.numlights;
      range2 = range + range1;
      photoncount = 0;
      for (lightindex = 0;lightindex < range2;lightindex++)
      {
            if (lightindex < range)
            {
                  light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
                  if (!light)
                        continue;
                  rtlight = &light->rtlight;
                  VectorClear(rtlight->photoncolor);
                  rtlight->photons = 0;
                  if (!(light->flags & flag))
                        continue;
                  if (settings.staticmode)
                  {
                        // when static, we skip styled lights because they tend to change...
                        if (rtlight->style > 0 && r_shadow_bouncegrid.integer != 2)
                              continue;
                  }
            }
            else
            {
                  rtlight = r_refdef.scene.lights[lightindex - range];
                  VectorClear(rtlight->photoncolor);
                  rtlight->photons = 0;
            }
            // draw only visible lights (major speedup)
            radius = rtlight->radius * settings.lightradiusscale;
            cullmins[0] = rtlight->shadoworigin[0] - radius;
            cullmins[1] = rtlight->shadoworigin[1] - radius;
            cullmins[2] = rtlight->shadoworigin[2] - radius;
            cullmaxs[0] = rtlight->shadoworigin[0] + radius;
            cullmaxs[1] = rtlight->shadoworigin[1] + radius;
            cullmaxs[2] = rtlight->shadoworigin[2] + radius;
            if (R_CullBox(cullmins, cullmaxs))
                  continue;
            if (r_refdef.scene.worldmodel
             && r_refdef.scene.worldmodel->brush.BoxTouchingVisibleLeafs
             && !r_refdef.scene.worldmodel->brush.BoxTouchingVisibleLeafs(r_refdef.scene.worldmodel, r_refdef.viewcache.world_leafvisible, cullmins, cullmaxs))
                  continue;
            w = r_shadow_lightintensityscale.value * (rtlight->ambientscale + rtlight->diffusescale + rtlight->specularscale);
            if (w * VectorLength2(rtlight->color) == 0.0f)
                  continue;
            w *= (rtlight->style >= 0 ? r_refdef.scene.rtlightstylevalue[rtlight->style] : 1);
            VectorScale(rtlight->color, w, rtlight->photoncolor);
            //if (!VectorLength2(rtlight->photoncolor))
            //    continue;
            // shoot particles from this light
            // use a calculation for the number of particles that will not
            // vary with lightstyle, otherwise we get randomized particle
            // distribution, the seeded random is only consistent for a
            // consistent number of particles on this light...
            s = rtlight->radius;
            lightintensity = VectorLength(rtlight->color) * (rtlight->ambientscale + rtlight->diffusescale + rtlight->specularscale);
            if (lightindex >= range)
                  lightintensity *= settings.dlightparticlemultiplier;
            rtlight->photons = max(0.0f, lightintensity * s * s);
            photoncount += rtlight->photons;
      }
      photonscaling = (float)settings.photons / max(1, photoncount);
      photonresidual = 0.0f;
      for (lightindex = 0;lightindex < range2;lightindex++)
      {
            if (lightindex < range)
            {
                  light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
                  if (!light)
                        continue;
                  rtlight = &light->rtlight;
            }
            else
                  rtlight = r_refdef.scene.lights[lightindex - range];
            // skip a light with no photons
            if (rtlight->photons == 0.0f)
                  continue;
            // skip a light with no photon color)
            if (VectorLength2(rtlight->photoncolor) == 0.0f)
                  continue;
            photonresidual += rtlight->photons * photonscaling;
            shootparticles = (int)bound(0, photonresidual, MAXBOUNCEGRIDPARTICLESPERLIGHT);
            if (!shootparticles)
                  continue;
            photonresidual -= shootparticles;
            radius = rtlight->radius * settings.lightradiusscale;
            s = settings.particleintensity / shootparticles;
            VectorScale(rtlight->photoncolor, s, baseshotcolor);
            r_refdef.stats.bouncegrid_lights++;
            r_refdef.stats.bouncegrid_particles += shootparticles;
            for (shotparticles = 0;shotparticles < shootparticles;shotparticles++)
            {
                  if (settings.stablerandom > 0)
                        seed = lightindex * 11937 + shotparticles;
                  VectorCopy(baseshotcolor, shotcolor);
                  VectorCopy(rtlight->shadoworigin, clipstart);
                  if (settings.stablerandom < 0)
                        VectorRandom(clipend);
                  else
                        VectorCheeseRandom(clipend);
                  VectorMA(clipstart, radius, clipend, clipend);
                  for (bouncecount = 0;;bouncecount++)
                  {
                        r_refdef.stats.bouncegrid_traces++;
                        //r_refdef.scene.worldmodel->TraceLineAgainstSurfaces(r_refdef.scene.worldmodel, NULL, NULL, &cliptrace, clipstart, clipend, hitsupercontentsmask);
                        //r_refdef.scene.worldmodel->TraceLine(r_refdef.scene.worldmodel, NULL, NULL, &cliptrace2, clipstart, clipend, hitsupercontentsmask);
                        //if (settings.staticmode)
                        //    Collision_ClipLineToWorld(&cliptrace, cl.worldmodel, clipstart, clipend, hitsupercontentsmask, true);
                        //else
                              cliptrace = CL_TraceLine(clipstart, clipend, settings.staticmode ? MOVE_WORLDONLY : (settings.hitmodels ? MOVE_HITMODEL : MOVE_NOMONSTERS), NULL, hitsupercontentsmask, true, false, NULL, true, true);
                        if (bouncecount > 0 || settings.includedirectlighting)
                        {
                              // calculate second order spherical harmonics values (average, slopeX, slopeY, slopeZ)
                              // accumulate average shotcolor
                              w = VectorLength(shotcolor);
                              splatcolor[ 0] = shotcolor[0];
                              splatcolor[ 1] = shotcolor[1];
                              splatcolor[ 2] = shotcolor[2];
                              splatcolor[ 3] = 0.0f;
                              if (pixelbands > 1)
                              {
                                    VectorSubtract(clipstart, cliptrace.endpos, clipdiff);
                                    VectorNormalize(clipdiff);
                                    // store bentnormal in case the shader has a use for it
                                    splatcolor[ 4] = clipdiff[0] * w;
                                    splatcolor[ 5] = clipdiff[1] * w;
                                    splatcolor[ 6] = clipdiff[2] * w;
                                    splatcolor[ 7] = w;
                                    // accumulate directional contributions (+X, +Y, +Z, -X, -Y, -Z)
                                    splatcolor[ 8] = shotcolor[0] * max(0.0f, clipdiff[0]);
                                    splatcolor[ 9] = shotcolor[0] * max(0.0f, clipdiff[1]);
                                    splatcolor[10] = shotcolor[0] * max(0.0f, clipdiff[2]);
                                    splatcolor[11] = 0.0f;
                                    splatcolor[12] = shotcolor[1] * max(0.0f, clipdiff[0]);
                                    splatcolor[13] = shotcolor[1] * max(0.0f, clipdiff[1]);
                                    splatcolor[14] = shotcolor[1] * max(0.0f, clipdiff[2]);
                                    splatcolor[15] = 0.0f;
                                    splatcolor[16] = shotcolor[2] * max(0.0f, clipdiff[0]);
                                    splatcolor[17] = shotcolor[2] * max(0.0f, clipdiff[1]);
                                    splatcolor[18] = shotcolor[2] * max(0.0f, clipdiff[2]);
                                    splatcolor[19] = 0.0f;
                                    splatcolor[20] = shotcolor[0] * max(0.0f, -clipdiff[0]);
                                    splatcolor[21] = shotcolor[0] * max(0.0f, -clipdiff[1]);
                                    splatcolor[22] = shotcolor[0] * max(0.0f, -clipdiff[2]);
                                    splatcolor[23] = 0.0f;
                                    splatcolor[24] = shotcolor[1] * max(0.0f, -clipdiff[0]);
                                    splatcolor[25] = shotcolor[1] * max(0.0f, -clipdiff[1]);
                                    splatcolor[26] = shotcolor[1] * max(0.0f, -clipdiff[2]);
                                    splatcolor[27] = 0.0f;
                                    splatcolor[28] = shotcolor[2] * max(0.0f, -clipdiff[0]);
                                    splatcolor[29] = shotcolor[2] * max(0.0f, -clipdiff[1]);
                                    splatcolor[30] = shotcolor[2] * max(0.0f, -clipdiff[2]);
                                    splatcolor[31] = 0.0f;
                              }
                              // calculate the number of steps we need to traverse this distance
                              VectorSubtract(cliptrace.endpos, clipstart, stepdelta);
                              numsteps = (int)(VectorLength(stepdelta) * ispacing[0]);
                              numsteps = bound(1, numsteps, 1024);
                              w = 1.0f / numsteps;
                              VectorScale(stepdelta, w, stepdelta);
                              VectorMA(clipstart, 0.5f, stepdelta, steppos);
                              for (step = 0;step < numsteps;step++)
                              {
                                    r_refdef.stats.bouncegrid_splats++;
                                    // figure out which texture pixel this is in
                                    texlerp[1][0] = ((steppos[0] - mins[0]) * ispacing[0]) - 0.5f;
                                    texlerp[1][1] = ((steppos[1] - mins[1]) * ispacing[1]) - 0.5f;
                                    texlerp[1][2] = ((steppos[2] - mins[2]) * ispacing[2]) - 0.5f;
                                    tex[0] = (int)floor(texlerp[1][0]);
                                    tex[1] = (int)floor(texlerp[1][1]);
                                    tex[2] = (int)floor(texlerp[1][2]);
                                    if (tex[0] >= 1 && tex[1] >= 1 && tex[2] >= 1 && tex[0] < resolution[0] - 2 && tex[1] < resolution[1] - 2 && tex[2] < resolution[2] - 2)
                                    {
                                          // it is within bounds...  do the real work now
                                          // calculate the lerp factors
                                          texlerp[1][0] -= tex[0];
                                          texlerp[1][1] -= tex[1];
                                          texlerp[1][2] -= tex[2];
                                          texlerp[0][0] = 1.0f - texlerp[1][0];
                                          texlerp[0][1] = 1.0f - texlerp[1][1];
                                          texlerp[0][2] = 1.0f - texlerp[1][2];
                                          // calculate individual pixel indexes and weights
                                          pixelindex[0] = (((tex[2]  )*resolution[1]+tex[1]  )*resolution[0]+tex[0]  );pixelweight[0] = (texlerp[0][0]*texlerp[0][1]*texlerp[0][2]);
                                          pixelindex[1] = (((tex[2]  )*resolution[1]+tex[1]  )*resolution[0]+tex[0]+1);pixelweight[1] = (texlerp[1][0]*texlerp[0][1]*texlerp[0][2]);
                                          pixelindex[2] = (((tex[2]  )*resolution[1]+tex[1]+1)*resolution[0]+tex[0]  );pixelweight[2] = (texlerp[0][0]*texlerp[1][1]*texlerp[0][2]);
                                          pixelindex[3] = (((tex[2]  )*resolution[1]+tex[1]+1)*resolution[0]+tex[0]+1);pixelweight[3] = (texlerp[1][0]*texlerp[1][1]*texlerp[0][2]);
                                          pixelindex[4] = (((tex[2]+1)*resolution[1]+tex[1]  )*resolution[0]+tex[0]  );pixelweight[4] = (texlerp[0][0]*texlerp[0][1]*texlerp[1][2]);
                                          pixelindex[5] = (((tex[2]+1)*resolution[1]+tex[1]  )*resolution[0]+tex[0]+1);pixelweight[5] = (texlerp[1][0]*texlerp[0][1]*texlerp[1][2]);
                                          pixelindex[6] = (((tex[2]+1)*resolution[1]+tex[1]+1)*resolution[0]+tex[0]  );pixelweight[6] = (texlerp[0][0]*texlerp[1][1]*texlerp[1][2]);
                                          pixelindex[7] = (((tex[2]+1)*resolution[1]+tex[1]+1)*resolution[0]+tex[0]+1);pixelweight[7] = (texlerp[1][0]*texlerp[1][1]*texlerp[1][2]);
                                          // update the 8 pixels...
                                          for (pixelband = 0;pixelband < pixelbands;pixelband++)
                                          {
                                                for (corner = 0;corner < 8;corner++)
                                                {
                                                      // calculate address for pixel
                                                      w = pixelweight[corner];
                                                      pixel = pixels + 4 * pixelindex[corner] + pixelband * pixelsperband * 4;
                                                      highpixel = highpixels + 4 * pixelindex[corner] + pixelband * pixelsperband * 4;
                                                      // add to the high precision pixel color
                                                      highpixel[0] += (splatcolor[pixelband*4+0]*w);
                                                      highpixel[1] += (splatcolor[pixelband*4+1]*w);
                                                      highpixel[2] += (splatcolor[pixelband*4+2]*w);
                                                      highpixel[3] += (splatcolor[pixelband*4+3]*w);
                                                      // flag the low precision pixel as needing to be updated
                                                      pixel[3] = 255;
                                                      // advance to next band of coefficients
                                                      //pixel += pixelsperband*4;
                                                      //highpixel += pixelsperband*4;
                                                }
                                          }
                                    }
                                    VectorAdd(steppos, stepdelta, steppos);
                              }
                        }
                        if (cliptrace.fraction >= 1.0f)
                              break;
                        r_refdef.stats.bouncegrid_hits++;
                        if (bouncecount >= maxbounce)
                              break;
                        // scale down shot color by bounce intensity and texture color (or 50% if no texture reported)
                        // also clamp the resulting color to never add energy, even if the user requests extreme values
                        if (cliptrace.hittexture && cliptrace.hittexture->currentskinframe)
                              VectorCopy(cliptrace.hittexture->currentskinframe->avgcolor, surfcolor);
                        else
                              VectorSet(surfcolor, 0.5f, 0.5f, 0.5f);
                        VectorScale(surfcolor, settings.particlebounceintensity, surfcolor);
                        surfcolor[0] = min(surfcolor[0], 1.0f);
                        surfcolor[1] = min(surfcolor[1], 1.0f);
                        surfcolor[2] = min(surfcolor[2], 1.0f);
                        VectorMultiply(shotcolor, surfcolor, shotcolor);
                        if (VectorLength2(baseshotcolor) == 0.0f)
                              break;
                        r_refdef.stats.bouncegrid_bounces++;
                        if (settings.bounceanglediffuse)
                        {
                              // random direction, primarily along plane normal
                              s = VectorDistance(cliptrace.endpos, clipend);
                              if (settings.stablerandom < 0)
                                    VectorRandom(clipend);
                              else
                                    VectorCheeseRandom(clipend);
                              VectorMA(cliptrace.plane.normal, 0.95f, clipend, clipend);
                              VectorNormalize(clipend);
                              VectorScale(clipend, s, clipend);
                        }
                        else
                        {
                              // reflect the remaining portion of the line across plane normal
                              VectorSubtract(clipend, cliptrace.endpos, clipdiff);
                              VectorReflect(clipdiff, 1.0, cliptrace.plane.normal, clipend);
                        }
                        // calculate the new line start and end
                        VectorCopy(cliptrace.endpos, clipstart);
                        VectorAdd(clipstart, clipend, clipend);
                  }
            }
      }
      // generate pixels array from highpixels array
      // skip first and last columns, rows, and layers as these are blank
      // the pixel[3] value was written above, so we can use it to detect only pixels that need to be calculated
      for (pixelband = 0;pixelband < pixelbands;pixelband++)
      {
            for (z = 1;z < resolution[2]-1;z++)
            {
                  for (y = 1;y < resolution[1]-1;y++)
                  {
                        for (x = 1, pixelindex[0] = ((pixelband*resolution[2]+z)*resolution[1]+y)*resolution[0]+x, pixel = pixels + 4*pixelindex[0], highpixel = highpixels + 4*pixelindex[0];x < resolution[0]-1;x++, pixel += 4, highpixel += 4)
                        {
                              // only convert pixels that were hit by photons
                              if (pixel[3] == 255)
                              {
                                    // normalize the bentnormal...
                                    if (pixelband == 1)
                                    {
                                          VectorNormalize(highpixel);
                                          c[0] = (int)(highpixel[0]*128.0f+128.0f);
                                          c[1] = (int)(highpixel[1]*128.0f+128.0f);
                                          c[2] = (int)(highpixel[2]*128.0f+128.0f);
                                          c[3] = (int)(highpixel[3]*128.0f+128.0f);
                                    }
                                    else
                                    {
                                          c[0] = (int)(highpixel[0]*256.0f);
                                          c[1] = (int)(highpixel[1]*256.0f);
                                          c[2] = (int)(highpixel[2]*256.0f);
                                          c[3] = (int)(highpixel[3]*256.0f);
                                    }
                                    pixel[2] = (unsigned char)bound(0, c[0], 255);
                                    pixel[1] = (unsigned char)bound(0, c[1], 255);
                                    pixel[0] = (unsigned char)bound(0, c[2], 255);
                                    pixel[3] = (unsigned char)bound(0, c[3], 255);
                              }
                        }
                  }
            }
      }
      if (r_shadow_bouncegridtexture && r_shadow_bouncegridresolution[0] == resolution[0] && r_shadow_bouncegridresolution[1] == resolution[1] && r_shadow_bouncegridresolution[2] == resolution[2] && r_shadow_bouncegriddirectional == settings.directionalshading)
            R_UpdateTexture(r_shadow_bouncegridtexture, pixels, 0, 0, 0, resolution[0], resolution[1], resolution[2]*pixelbands);
      else
      {
            VectorCopy(resolution, r_shadow_bouncegridresolution);
            r_shadow_bouncegriddirectional = settings.directionalshading;
            if (r_shadow_bouncegridtexture)
                  R_FreeTexture(r_shadow_bouncegridtexture);
            r_shadow_bouncegridtexture = R_LoadTexture3D(r_shadow_texturepool, "bouncegrid", resolution[0], resolution[1], resolution[2]*pixelbands, pixels, TEXTYPE_BGRA, TEXF_CLAMP | TEXF_ALPHA | TEXF_FORCELINEAR, 0, NULL);
      }
      r_shadow_bouncegridtime = realtime;
}

void R_Shadow_RenderMode_VisibleShadowVolumes(void)
{
      R_Shadow_RenderMode_Reset();
      GL_BlendFunc(GL_ONE, GL_ONE);
      GL_DepthRange(0, 1);
      GL_DepthTest(r_showshadowvolumes.integer < 2);
      GL_Color(0.0, 0.0125 * r_refdef.view.colorscale, 0.1 * r_refdef.view.colorscale, 1);
      GL_PolygonOffset(r_refdef.shadowpolygonfactor, r_refdef.shadowpolygonoffset);CHECKGLERROR
      GL_CullFace(GL_NONE);
      r_shadow_rendermode = R_SHADOW_RENDERMODE_VISIBLEVOLUMES;
}

void R_Shadow_RenderMode_VisibleLighting(qboolean stenciltest, qboolean transparent)
{
      R_Shadow_RenderMode_Reset();
      GL_BlendFunc(GL_ONE, GL_ONE);
      GL_DepthRange(0, 1);
      GL_DepthTest(r_showlighting.integer < 2);
      GL_Color(0.1 * r_refdef.view.colorscale, 0.0125 * r_refdef.view.colorscale, 0, 1);
      if (!transparent)
            GL_DepthFunc(GL_EQUAL);
      R_SetStencil(stenciltest, 255, GL_KEEP, GL_KEEP, GL_KEEP, GL_EQUAL, 128, 255);
      r_shadow_rendermode = R_SHADOW_RENDERMODE_VISIBLELIGHTING;
}

void R_Shadow_RenderMode_End(void)
{
      R_Shadow_RenderMode_Reset();
      R_Shadow_RenderMode_ActiveLight(NULL);
      GL_DepthMask(true);
      GL_Scissor(r_refdef.view.viewport.x, r_refdef.view.viewport.y, r_refdef.view.viewport.width, r_refdef.view.viewport.height);
      r_shadow_rendermode = R_SHADOW_RENDERMODE_NONE;
}

int bboxedges[12][2] =
{
      // top
      {0, 1}, // +X
      {0, 2}, // +Y
      {1, 3}, // Y, +X
      {2, 3}, // X, +Y
      // bottom
      {4, 5}, // +X
      {4, 6}, // +Y
      {5, 7}, // Y, +X
      {6, 7}, // X, +Y
      // verticals
      {0, 4}, // +Z
      {1, 5}, // X, +Z
      {2, 6}, // Y, +Z
      {3, 7}, // XY, +Z
};

qboolean R_Shadow_ScissorForBBox(const float *mins, const float *maxs)
{
      if (!r_shadow_scissor.integer || r_shadow_usingdeferredprepass || r_trippy.integer)
      {
            r_shadow_lightscissor[0] = r_refdef.view.viewport.x;
            r_shadow_lightscissor[1] = r_refdef.view.viewport.y;
            r_shadow_lightscissor[2] = r_refdef.view.viewport.width;
            r_shadow_lightscissor[3] = r_refdef.view.viewport.height;
            return false;
      }
      if(R_ScissorForBBox(mins, maxs, r_shadow_lightscissor))
            return true; // invisible
      if(r_shadow_lightscissor[0] != r_refdef.view.viewport.x
      || r_shadow_lightscissor[1] != r_refdef.view.viewport.y
      || r_shadow_lightscissor[2] != r_refdef.view.viewport.width
      || r_shadow_lightscissor[3] != r_refdef.view.viewport.height)
            r_refdef.stats.lights_scissored++;
      return false;
}

static void R_Shadow_RenderLighting_Light_Vertex_Shading(int firstvertex, int numverts, const float *diffusecolor, const float *ambientcolor)
{
      int i;
      const float *vertex3f;
      const float *normal3f;
      float *color4f;
      float dist, dot, distintensity, shadeintensity, v[3], n[3];
      switch (r_shadow_rendermode)
      {
      case R_SHADOW_RENDERMODE_LIGHT_VERTEX3DATTEN:
      case R_SHADOW_RENDERMODE_LIGHT_VERTEX2D1DATTEN:
            if (VectorLength2(diffusecolor) > 0)
            {
                  for (i = 0, vertex3f = rsurface.batchvertex3f + 3*firstvertex, normal3f = rsurface.batchnormal3f + 3*firstvertex, color4f = rsurface.passcolor4f + 4 * firstvertex;i < numverts;i++, vertex3f += 3, normal3f += 3, color4f += 4)
                  {
                        Matrix4x4_Transform(&rsurface.entitytolight, vertex3f, v);
                        Matrix4x4_Transform3x3(&rsurface.entitytolight, normal3f, n);
                        if ((dot = DotProduct(n, v)) < 0)
                        {
                              shadeintensity = -dot / sqrt(VectorLength2(v) * VectorLength2(n));
                              VectorMA(ambientcolor, shadeintensity, diffusecolor, color4f);
                        }
                        else
                              VectorCopy(ambientcolor, color4f);
                        if (r_refdef.fogenabled)
                        {
                              float f;
                              f = RSurf_FogVertex(vertex3f);
                              VectorScale(color4f, f, color4f);
                        }
                        color4f[3] = 1;
                  }
            }
            else
            {
                  for (i = 0, vertex3f = rsurface.batchvertex3f + 3*firstvertex, color4f = rsurface.passcolor4f + 4 * firstvertex;i < numverts;i++, vertex3f += 3, color4f += 4)
                  {
                        VectorCopy(ambientcolor, color4f);
                        if (r_refdef.fogenabled)
                        {
                              float f;
                              Matrix4x4_Transform(&rsurface.entitytolight, vertex3f, v);
                              f = RSurf_FogVertex(vertex3f);
                              VectorScale(color4f + 4*i, f, color4f);
                        }
                        color4f[3] = 1;
                  }
            }
            break;
      case R_SHADOW_RENDERMODE_LIGHT_VERTEX2DATTEN:
            if (VectorLength2(diffusecolor) > 0)
            {
                  for (i = 0, vertex3f = rsurface.batchvertex3f + 3*firstvertex, normal3f = rsurface.batchnormal3f + 3*firstvertex, color4f = rsurface.passcolor4f + 4 * firstvertex;i < numverts;i++, vertex3f += 3, normal3f += 3, color4f += 4)
                  {
                        Matrix4x4_Transform(&rsurface.entitytolight, vertex3f, v);
                        if ((dist = fabs(v[2])) < 1 && (distintensity = r_shadow_attentable[(int)(dist * ATTENTABLESIZE)]))
                        {
                              Matrix4x4_Transform3x3(&rsurface.entitytolight, normal3f, n);
                              if ((dot = DotProduct(n, v)) < 0)
                              {
                                    shadeintensity = -dot / sqrt(VectorLength2(v) * VectorLength2(n));
                                    color4f[0] = (ambientcolor[0] + shadeintensity * diffusecolor[0]) * distintensity;
                                    color4f[1] = (ambientcolor[1] + shadeintensity * diffusecolor[1]) * distintensity;
                                    color4f[2] = (ambientcolor[2] + shadeintensity * diffusecolor[2]) * distintensity;
                              }
                              else
                              {
                                    color4f[0] = ambientcolor[0] * distintensity;
                                    color4f[1] = ambientcolor[1] * distintensity;
                                    color4f[2] = ambientcolor[2] * distintensity;
                              }
                              if (r_refdef.fogenabled)
                              {
                                    float f;
                                    f = RSurf_FogVertex(vertex3f);
                                    VectorScale(color4f, f, color4f);
                              }
                        }
                        else
                              VectorClear(color4f);
                        color4f[3] = 1;
                  }
            }
            else
            {
                  for (i = 0, vertex3f = rsurface.batchvertex3f + 3*firstvertex, color4f = rsurface.passcolor4f + 4 * firstvertex;i < numverts;i++, vertex3f += 3, color4f += 4)
                  {
                        Matrix4x4_Transform(&rsurface.entitytolight, vertex3f, v);
                        if ((dist = fabs(v[2])) < 1 && (distintensity = r_shadow_attentable[(int)(dist * ATTENTABLESIZE)]))
                        {
                              color4f[0] = ambientcolor[0] * distintensity;
                              color4f[1] = ambientcolor[1] * distintensity;
                              color4f[2] = ambientcolor[2] * distintensity;
                              if (r_refdef.fogenabled)
                              {
                                    float f;
                                    f = RSurf_FogVertex(vertex3f);
                                    VectorScale(color4f, f, color4f);
                              }
                        }
                        else
                              VectorClear(color4f);
                        color4f[3] = 1;
                  }
            }
            break;
      case R_SHADOW_RENDERMODE_LIGHT_VERTEX:
            if (VectorLength2(diffusecolor) > 0)
            {
                  for (i = 0, vertex3f = rsurface.batchvertex3f + 3*firstvertex, normal3f = rsurface.batchnormal3f + 3*firstvertex, color4f = rsurface.passcolor4f + 4 * firstvertex;i < numverts;i++, vertex3f += 3, normal3f += 3, color4f += 4)
                  {
                        Matrix4x4_Transform(&rsurface.entitytolight, vertex3f, v);
                        if ((dist = VectorLength(v)) < 1 && (distintensity = r_shadow_attentable[(int)(dist * ATTENTABLESIZE)]))
                        {
                              distintensity = (1 - dist) * r_shadow_lightattenuationlinearscale.value / (r_shadow_lightattenuationdividebias.value + dist*dist);
                              Matrix4x4_Transform3x3(&rsurface.entitytolight, normal3f, n);
                              if ((dot = DotProduct(n, v)) < 0)
                              {
                                    shadeintensity = -dot / sqrt(VectorLength2(v) * VectorLength2(n));
                                    color4f[0] = (ambientcolor[0] + shadeintensity * diffusecolor[0]) * distintensity;
                                    color4f[1] = (ambientcolor[1] + shadeintensity * diffusecolor[1]) * distintensity;
                                    color4f[2] = (ambientcolor[2] + shadeintensity * diffusecolor[2]) * distintensity;
                              }
                              else
                              {
                                    color4f[0] = ambientcolor[0] * distintensity;
                                    color4f[1] = ambientcolor[1] * distintensity;
                                    color4f[2] = ambientcolor[2] * distintensity;
                              }
                              if (r_refdef.fogenabled)
                              {
                                    float f;
                                    f = RSurf_FogVertex(vertex3f);
                                    VectorScale(color4f, f, color4f);
                              }
                        }
                        else
                              VectorClear(color4f);
                        color4f[3] = 1;
                  }
            }
            else
            {
                  for (i = 0, vertex3f = rsurface.batchvertex3f + 3*firstvertex, color4f = rsurface.passcolor4f + 4 * firstvertex;i < numverts;i++, vertex3f += 3, color4f += 4)
                  {
                        Matrix4x4_Transform(&rsurface.entitytolight, vertex3f, v);
                        if ((dist = VectorLength(v)) < 1 && (distintensity = r_shadow_attentable[(int)(dist * ATTENTABLESIZE)]))
                        {
                              distintensity = (1 - dist) * r_shadow_lightattenuationlinearscale.value / (r_shadow_lightattenuationdividebias.value + dist*dist);
                              color4f[0] = ambientcolor[0] * distintensity;
                              color4f[1] = ambientcolor[1] * distintensity;
                              color4f[2] = ambientcolor[2] * distintensity;
                              if (r_refdef.fogenabled)
                              {
                                    float f;
                                    f = RSurf_FogVertex(vertex3f);
                                    VectorScale(color4f, f, color4f);
                              }
                        }
                        else
                              VectorClear(color4f);
                        color4f[3] = 1;
                  }
            }
            break;
      default:
            break;
      }
}

static void R_Shadow_RenderLighting_VisibleLighting(int texturenumsurfaces, const msurface_t **texturesurfacelist)
{
      // used to display how many times a surface is lit for level design purposes
      RSurf_PrepareVerticesForBatch(BATCHNEED_ARRAY_VERTEX | BATCHNEED_NOGAPS, texturenumsurfaces, texturesurfacelist);
      R_Mesh_PrepareVertices_Generic_Arrays(rsurface.batchnumvertices, rsurface.batchvertex3f, NULL, NULL);
      RSurf_DrawBatch();
}

static void R_Shadow_RenderLighting_Light_GLSL(int texturenumsurfaces, const msurface_t **texturesurfacelist, const vec3_t lightcolor, float ambientscale, float diffusescale, float specularscale)
{
      // ARB2 GLSL shader path (GFFX5200, Radeon 9500)
      R_SetupShader_Surface(lightcolor, false, ambientscale, diffusescale, specularscale, RSURFPASS_RTLIGHT, texturenumsurfaces, texturesurfacelist, NULL, false);
      RSurf_DrawBatch();
}

static void R_Shadow_RenderLighting_Light_Vertex_Pass(int firstvertex, int numvertices, int numtriangles, const int *element3i, vec3_t diffusecolor2, vec3_t ambientcolor2)
{
      int renders;
      int i;
      int stop;
      int newfirstvertex;
      int newlastvertex;
      int newnumtriangles;
      int *newe;
      const int *e;
      float *c;
      int maxtriangles = 4096;
      static int newelements[4096*3];
      R_Shadow_RenderLighting_Light_Vertex_Shading(firstvertex, numvertices, diffusecolor2, ambientcolor2);
      for (renders = 0;renders < 4;renders++)
      {
            stop = true;
            newfirstvertex = 0;
            newlastvertex = 0;
            newnumtriangles = 0;
            newe = newelements;
            // due to low fillrate on the cards this vertex lighting path is
            // designed for, we manually cull all triangles that do not
            // contain a lit vertex
            // this builds batches of triangles from multiple surfaces and
            // renders them at once
            for (i = 0, e = element3i;i < numtriangles;i++, e += 3)
            {
                  if (VectorLength2(rsurface.passcolor4f + e[0] * 4) + VectorLength2(rsurface.passcolor4f + e[1] * 4) + VectorLength2(rsurface.passcolor4f + e[2] * 4) >= 0.01)
                  {
                        if (newnumtriangles)
                        {
                              newfirstvertex = min(newfirstvertex, e[0]);
                              newlastvertex  = max(newlastvertex, e[0]);
                        }
                        else
                        {
                              newfirstvertex = e[0];
                              newlastvertex = e[0];
                        }
                        newfirstvertex = min(newfirstvertex, e[1]);
                        newlastvertex  = max(newlastvertex, e[1]);
                        newfirstvertex = min(newfirstvertex, e[2]);
                        newlastvertex  = max(newlastvertex, e[2]);
                        newe[0] = e[0];
                        newe[1] = e[1];
                        newe[2] = e[2];
                        newnumtriangles++;
                        newe += 3;
                        if (newnumtriangles >= maxtriangles)
                        {
                              R_Mesh_Draw(newfirstvertex, newlastvertex - newfirstvertex + 1, 0, newnumtriangles, newelements, NULL, 0, NULL, NULL, 0);
                              newnumtriangles = 0;
                              newe = newelements;
                              stop = false;
                        }
                  }
            }
            if (newnumtriangles >= 1)
            {
                  R_Mesh_Draw(newfirstvertex, newlastvertex - newfirstvertex + 1, 0, newnumtriangles, newelements, NULL, 0, NULL, NULL, 0);
                  stop = false;
            }
            // if we couldn't find any lit triangles, exit early
            if (stop)
                  break;
            // now reduce the intensity for the next overbright pass
            // we have to clamp to 0 here incase the drivers have improper
            // handling of negative colors
            // (some old drivers even have improper handling of >1 color)
            stop = true;
            for (i = 0, c = rsurface.passcolor4f + 4 * firstvertex;i < numvertices;i++, c += 4)
            {
                  if (c[0] > 1 || c[1] > 1 || c[2] > 1)
                  {
                        c[0] = max(0, c[0] - 1);
                        c[1] = max(0, c[1] - 1);
                        c[2] = max(0, c[2] - 1);
                        stop = false;
                  }
                  else
                        VectorClear(c);
            }
            // another check...
            if (stop)
                  break;
      }
}

static void R_Shadow_RenderLighting_Light_Vertex(int texturenumsurfaces, const msurface_t **texturesurfacelist, const vec3_t lightcolor, float ambientscale, float diffusescale)
{
      // OpenGL 1.1 path (anything)
      float ambientcolorbase[3], diffusecolorbase[3];
      float ambientcolorpants[3], diffusecolorpants[3];
      float ambientcolorshirt[3], diffusecolorshirt[3];
      const float *surfacecolor = rsurface.texture->dlightcolor;
      const float *surfacepants = rsurface.colormap_pantscolor;
      const float *surfaceshirt = rsurface.colormap_shirtcolor;
      rtexture_t *basetexture = rsurface.texture->basetexture;
      rtexture_t *pantstexture = rsurface.texture->pantstexture;
      rtexture_t *shirttexture = rsurface.texture->shirttexture;
      qboolean dopants = pantstexture && VectorLength2(surfacepants) >= (1.0f / 1048576.0f);
      qboolean doshirt = shirttexture && VectorLength2(surfaceshirt) >= (1.0f / 1048576.0f);
      ambientscale *= 2 * r_refdef.view.colorscale;
      diffusescale *= 2 * r_refdef.view.colorscale;
      ambientcolorbase[0] = lightcolor[0] * ambientscale * surfacecolor[0];ambientcolorbase[1] = lightcolor[1] * ambientscale * surfacecolor[1];ambientcolorbase[2] = lightcolor[2] * ambientscale * surfacecolor[2];
      diffusecolorbase[0] = lightcolor[0] * diffusescale * surfacecolor[0];diffusecolorbase[1] = lightcolor[1] * diffusescale * surfacecolor[1];diffusecolorbase[2] = lightcolor[2] * diffusescale * surfacecolor[2];
      ambientcolorpants[0] = ambientcolorbase[0] * surfacepants[0];ambientcolorpants[1] = ambientcolorbase[1] * surfacepants[1];ambientcolorpants[2] = ambientcolorbase[2] * surfacepants[2];
      diffusecolorpants[0] = diffusecolorbase[0] * surfacepants[0];diffusecolorpants[1] = diffusecolorbase[1] * surfacepants[1];diffusecolorpants[2] = diffusecolorbase[2] * surfacepants[2];
      ambientcolorshirt[0] = ambientcolorbase[0] * surfaceshirt[0];ambientcolorshirt[1] = ambientcolorbase[1] * surfaceshirt[1];ambientcolorshirt[2] = ambientcolorbase[2] * surfaceshirt[2];
      diffusecolorshirt[0] = diffusecolorbase[0] * surfaceshirt[0];diffusecolorshirt[1] = diffusecolorbase[1] * surfaceshirt[1];diffusecolorshirt[2] = diffusecolorbase[2] * surfaceshirt[2];
      RSurf_PrepareVerticesForBatch(BATCHNEED_ARRAY_VERTEX | (diffusescale > 0 ? BATCHNEED_ARRAY_NORMAL : 0) | BATCHNEED_ARRAY_TEXCOORD | BATCHNEED_NOGAPS, texturenumsurfaces, texturesurfacelist);
      rsurface.passcolor4f = (float *)R_FrameData_Alloc((rsurface.batchfirstvertex + rsurface.batchnumvertices) * sizeof(float[4]));
      R_Mesh_VertexPointer(3, GL_FLOAT, sizeof(float[3]), rsurface.batchvertex3f, rsurface.batchvertex3f_vertexbuffer, rsurface.batchvertex3f_bufferoffset);
      R_Mesh_ColorPointer(4, GL_FLOAT, sizeof(float[4]), rsurface.passcolor4f, 0, 0);
      R_Mesh_TexCoordPointer(0, 2, GL_FLOAT, sizeof(float[2]), rsurface.batchtexcoordtexture2f, rsurface.batchtexcoordtexture2f_vertexbuffer, rsurface.batchtexcoordtexture2f_bufferoffset);
      R_Mesh_TexBind(0, basetexture);
      R_Mesh_TexMatrix(0, &rsurface.texture->currenttexmatrix);
      R_Mesh_TexCombine(0, GL_MODULATE, GL_MODULATE, 1, 1);
      switch(r_shadow_rendermode)
      {
      case R_SHADOW_RENDERMODE_LIGHT_VERTEX3DATTEN:
            R_Mesh_TexBind(1, r_shadow_attenuation3dtexture);
            R_Mesh_TexMatrix(1, &rsurface.entitytoattenuationxyz);
            R_Mesh_TexCombine(1, GL_MODULATE, GL_MODULATE, 1, 1);
            R_Mesh_TexCoordPointer(1, 3, GL_FLOAT, sizeof(float[3]), rsurface.batchvertex3f, rsurface.batchvertex3f_vertexbuffer, rsurface.batchvertex3f_bufferoffset);
            break;
      case R_SHADOW_RENDERMODE_LIGHT_VERTEX2D1DATTEN:
            R_Mesh_TexBind(2, r_shadow_attenuation2dtexture);
            R_Mesh_TexMatrix(2, &rsurface.entitytoattenuationz);
            R_Mesh_TexCombine(2, GL_MODULATE, GL_MODULATE, 1, 1);
            R_Mesh_TexCoordPointer(2, 3, GL_FLOAT, sizeof(float[3]), rsurface.batchvertex3f, rsurface.batchvertex3f_vertexbuffer, rsurface.batchvertex3f_bufferoffset);
            // fall through
      case R_SHADOW_RENDERMODE_LIGHT_VERTEX2DATTEN:
            R_Mesh_TexBind(1, r_shadow_attenuation2dtexture);
            R_Mesh_TexMatrix(1, &rsurface.entitytoattenuationxyz);
            R_Mesh_TexCombine(1, GL_MODULATE, GL_MODULATE, 1, 1);
            R_Mesh_TexCoordPointer(1, 3, GL_FLOAT, sizeof(float[3]), rsurface.batchvertex3f, rsurface.batchvertex3f_vertexbuffer, rsurface.batchvertex3f_bufferoffset);
            break;
      case R_SHADOW_RENDERMODE_LIGHT_VERTEX:
            break;
      default:
            break;
      }
      //R_Mesh_TexBind(0, basetexture);
      R_Shadow_RenderLighting_Light_Vertex_Pass(rsurface.batchfirstvertex, rsurface.batchnumvertices, rsurface.batchnumtriangles, rsurface.batchelement3i + 3*rsurface.batchfirsttriangle, diffusecolorbase, ambientcolorbase);
      if (dopants)
      {
            R_Mesh_TexBind(0, pantstexture);
            R_Shadow_RenderLighting_Light_Vertex_Pass(rsurface.batchfirstvertex, rsurface.batchnumvertices, rsurface.batchnumtriangles, rsurface.batchelement3i + 3*rsurface.batchfirsttriangle, diffusecolorpants, ambientcolorpants);
      }
      if (doshirt)
      {
            R_Mesh_TexBind(0, shirttexture);
            R_Shadow_RenderLighting_Light_Vertex_Pass(rsurface.batchfirstvertex, rsurface.batchnumvertices, rsurface.batchnumtriangles, rsurface.batchelement3i + 3*rsurface.batchfirsttriangle, diffusecolorshirt, ambientcolorshirt);
      }
}

extern cvar_t gl_lightmaps;
void R_Shadow_RenderLighting(int texturenumsurfaces, const msurface_t **texturesurfacelist)
{
      float ambientscale, diffusescale, specularscale;
      qboolean negated;
      float lightcolor[3];
      VectorCopy(rsurface.rtlight->currentcolor, lightcolor);
      ambientscale = rsurface.rtlight->ambientscale;
      diffusescale = rsurface.rtlight->diffusescale;
      specularscale = rsurface.rtlight->specularscale * rsurface.texture->specularscale;
      if (!r_shadow_usenormalmap.integer)
      {
            ambientscale += 1.0f * diffusescale;
            diffusescale = 0;
            specularscale = 0;
      }
      if ((ambientscale + diffusescale) * VectorLength2(lightcolor) + specularscale * VectorLength2(lightcolor) < (1.0f / 1048576.0f))
            return;
      negated = (lightcolor[0] + lightcolor[1] + lightcolor[2] < 0) && vid.support.ext_blend_subtract;
      if(negated)
      {
            VectorNegate(lightcolor, lightcolor);
            GL_BlendEquationSubtract(true);
      }
      RSurf_SetupDepthAndCulling();
      switch (r_shadow_rendermode)
      {
      case R_SHADOW_RENDERMODE_VISIBLELIGHTING:
            GL_DepthTest(!(rsurface.texture->currentmaterialflags & MATERIALFLAG_NODEPTHTEST) && !r_showdisabledepthtest.integer);
            R_Shadow_RenderLighting_VisibleLighting(texturenumsurfaces, texturesurfacelist);
            break;
      case R_SHADOW_RENDERMODE_LIGHT_GLSL:
            R_Shadow_RenderLighting_Light_GLSL(texturenumsurfaces, texturesurfacelist, lightcolor, ambientscale, diffusescale, specularscale);
            break;
      case R_SHADOW_RENDERMODE_LIGHT_VERTEX3DATTEN:
      case R_SHADOW_RENDERMODE_LIGHT_VERTEX2D1DATTEN:
      case R_SHADOW_RENDERMODE_LIGHT_VERTEX2DATTEN:
      case R_SHADOW_RENDERMODE_LIGHT_VERTEX:
            R_Shadow_RenderLighting_Light_Vertex(texturenumsurfaces, texturesurfacelist, lightcolor, ambientscale, diffusescale);
            break;
      default:
            Con_Printf("R_Shadow_RenderLighting: unknown r_shadow_rendermode %i\n", r_shadow_rendermode);
            break;
      }
      if(negated)
            GL_BlendEquationSubtract(false);
}

void R_RTLight_Update(rtlight_t *rtlight, int isstatic, matrix4x4_t *matrix, vec3_t color, int style, const char *cubemapname, int shadow, vec_t corona, vec_t coronasizescale, vec_t ambientscale, vec_t diffusescale, vec_t specularscale, int flags)
{
      matrix4x4_t tempmatrix = *matrix;
      Matrix4x4_Scale(&tempmatrix, r_shadow_lightradiusscale.value, 1);

      // if this light has been compiled before, free the associated data
      R_RTLight_Uncompile(rtlight);

      // clear it completely to avoid any lingering data
      memset(rtlight, 0, sizeof(*rtlight));

      // copy the properties
      rtlight->matrix_lighttoworld = tempmatrix;
      Matrix4x4_Invert_Simple(&rtlight->matrix_worldtolight, &tempmatrix);
      Matrix4x4_OriginFromMatrix(&tempmatrix, rtlight->shadoworigin);
      rtlight->radius = Matrix4x4_ScaleFromMatrix(&tempmatrix);
      VectorCopy(color, rtlight->color);
      rtlight->cubemapname[0] = 0;
      if (cubemapname && cubemapname[0])
            strlcpy(rtlight->cubemapname, cubemapname, sizeof(rtlight->cubemapname));
      rtlight->shadow = shadow;
      rtlight->corona = corona;
      rtlight->style = style;
      rtlight->isstatic = isstatic;
      rtlight->coronasizescale = coronasizescale;
      rtlight->ambientscale = ambientscale;
      rtlight->diffusescale = diffusescale;
      rtlight->specularscale = specularscale;
      rtlight->flags = flags;

      // compute derived data
      //rtlight->cullradius = rtlight->radius;
      //rtlight->cullradius2 = rtlight->radius * rtlight->radius;
      rtlight->cullmins[0] = rtlight->shadoworigin[0] - rtlight->radius;
      rtlight->cullmins[1] = rtlight->shadoworigin[1] - rtlight->radius;
      rtlight->cullmins[2] = rtlight->shadoworigin[2] - rtlight->radius;
      rtlight->cullmaxs[0] = rtlight->shadoworigin[0] + rtlight->radius;
      rtlight->cullmaxs[1] = rtlight->shadoworigin[1] + rtlight->radius;
      rtlight->cullmaxs[2] = rtlight->shadoworigin[2] + rtlight->radius;
}

// compiles rtlight geometry
// (undone by R_FreeCompiledRTLight, which R_UpdateLight calls)
void R_RTLight_Compile(rtlight_t *rtlight)
{
      int i;
      int numsurfaces, numleafs, numleafpvsbytes, numshadowtrispvsbytes, numlighttrispvsbytes;
      int lighttris, shadowtris, shadowzpasstris, shadowzfailtris;
      entity_render_t *ent = r_refdef.scene.worldentity;
      dp_model_t *model = r_refdef.scene.worldmodel;
      unsigned char *data;
      shadowmesh_t *mesh;

      // compile the light
      rtlight->compiled = true;
      rtlight->shadowmode = rtlight->shadow ? (int)r_shadow_shadowmode : -1;
      rtlight->static_numleafs = 0;
      rtlight->static_numleafpvsbytes = 0;
      rtlight->static_leaflist = NULL;
      rtlight->static_leafpvs = NULL;
      rtlight->static_numsurfaces = 0;
      rtlight->static_surfacelist = NULL;
      rtlight->static_shadowmap_receivers = 0x3F;
      rtlight->static_shadowmap_casters = 0x3F;
      rtlight->cullmins[0] = rtlight->shadoworigin[0] - rtlight->radius;
      rtlight->cullmins[1] = rtlight->shadoworigin[1] - rtlight->radius;
      rtlight->cullmins[2] = rtlight->shadoworigin[2] - rtlight->radius;
      rtlight->cullmaxs[0] = rtlight->shadoworigin[0] + rtlight->radius;
      rtlight->cullmaxs[1] = rtlight->shadoworigin[1] + rtlight->radius;
      rtlight->cullmaxs[2] = rtlight->shadoworigin[2] + rtlight->radius;

      if (model && model->GetLightInfo)
      {
            // this variable must be set for the CompileShadowVolume/CompileShadowMap code
            r_shadow_compilingrtlight = rtlight;
            R_FrameData_SetMark();
            model->GetLightInfo(ent, rtlight->shadoworigin, rtlight->radius, rtlight->cullmins, rtlight->cullmaxs, r_shadow_buffer_leaflist, r_shadow_buffer_leafpvs, &numleafs, r_shadow_buffer_surfacelist, r_shadow_buffer_surfacepvs, &numsurfaces, r_shadow_buffer_shadowtrispvs, r_shadow_buffer_lighttrispvs, r_shadow_buffer_visitingleafpvs, 0, NULL);
            R_FrameData_ReturnToMark();
            numleafpvsbytes = (model->brush.num_leafs + 7) >> 3;
            numshadowtrispvsbytes = ((model->brush.shadowmesh ? model->brush.shadowmesh->numtriangles : model->surfmesh.num_triangles) + 7) >> 3;
            numlighttrispvsbytes = (model->surfmesh.num_triangles + 7) >> 3;
            data = (unsigned char *)Mem_Alloc(r_main_mempool, sizeof(int) * numsurfaces + sizeof(int) * numleafs + numleafpvsbytes + numshadowtrispvsbytes + numlighttrispvsbytes);
            rtlight->static_numsurfaces = numsurfaces;
            rtlight->static_surfacelist = (int *)data;data += sizeof(int) * numsurfaces;
            rtlight->static_numleafs = numleafs;
            rtlight->static_leaflist = (int *)data;data += sizeof(int) * numleafs;
            rtlight->static_numleafpvsbytes = numleafpvsbytes;
            rtlight->static_leafpvs = (unsigned char *)data;data += numleafpvsbytes;
            rtlight->static_numshadowtrispvsbytes = numshadowtrispvsbytes;
            rtlight->static_shadowtrispvs = (unsigned char *)data;data += numshadowtrispvsbytes;
            rtlight->static_numlighttrispvsbytes = numlighttrispvsbytes;
            rtlight->static_lighttrispvs = (unsigned char *)data;data += numlighttrispvsbytes;
            if (rtlight->static_numsurfaces)
                  memcpy(rtlight->static_surfacelist, r_shadow_buffer_surfacelist, rtlight->static_numsurfaces * sizeof(*rtlight->static_surfacelist));
            if (rtlight->static_numleafs)
                  memcpy(rtlight->static_leaflist, r_shadow_buffer_leaflist, rtlight->static_numleafs * sizeof(*rtlight->static_leaflist));
            if (rtlight->static_numleafpvsbytes)
                  memcpy(rtlight->static_leafpvs, r_shadow_buffer_leafpvs, rtlight->static_numleafpvsbytes);
            if (rtlight->static_numshadowtrispvsbytes)
                  memcpy(rtlight->static_shadowtrispvs, r_shadow_buffer_shadowtrispvs, rtlight->static_numshadowtrispvsbytes);
            if (rtlight->static_numlighttrispvsbytes)
                  memcpy(rtlight->static_lighttrispvs, r_shadow_buffer_lighttrispvs, rtlight->static_numlighttrispvsbytes);
            R_FrameData_SetMark();
            switch (rtlight->shadowmode)
            {
            case R_SHADOW_SHADOWMODE_SHADOWMAP2D:
                  if (model->CompileShadowMap && rtlight->shadow)
                        model->CompileShadowMap(ent, rtlight->shadoworigin, NULL, rtlight->radius, numsurfaces, r_shadow_buffer_surfacelist);
                  break;
            default:
                  if (model->CompileShadowVolume && rtlight->shadow)
                        model->CompileShadowVolume(ent, rtlight->shadoworigin, NULL, rtlight->radius, numsurfaces, r_shadow_buffer_surfacelist);
                  break;
            }
            R_FrameData_ReturnToMark();
            // now we're done compiling the rtlight
            r_shadow_compilingrtlight = NULL;
      }


      // use smallest available cullradius - box radius or light radius
      //rtlight->cullradius = RadiusFromBoundsAndOrigin(rtlight->cullmins, rtlight->cullmaxs, rtlight->shadoworigin);
      //rtlight->cullradius = min(rtlight->cullradius, rtlight->radius);

      shadowzpasstris = 0;
      if (rtlight->static_meshchain_shadow_zpass)
            for (mesh = rtlight->static_meshchain_shadow_zpass;mesh;mesh = mesh->next)
                  shadowzpasstris += mesh->numtriangles;

      shadowzfailtris = 0;
      if (rtlight->static_meshchain_shadow_zfail)
            for (mesh = rtlight->static_meshchain_shadow_zfail;mesh;mesh = mesh->next)
                  shadowzfailtris += mesh->numtriangles;

      lighttris = 0;
      if (rtlight->static_numlighttrispvsbytes)
            for (i = 0;i < rtlight->static_numlighttrispvsbytes*8;i++)
                  if (CHECKPVSBIT(rtlight->static_lighttrispvs, i))
                        lighttris++;

      shadowtris = 0;
      if (rtlight->static_numlighttrispvsbytes)
            for (i = 0;i < rtlight->static_numshadowtrispvsbytes*8;i++)
                  if (CHECKPVSBIT(rtlight->static_shadowtrispvs, i))
                        shadowtris++;

      if (developer_extra.integer)
            Con_DPrintf("static light built: %f %f %f : %f %f %f box, %i light triangles, %i shadow triangles, %i zpass/%i zfail compiled shadow volume triangles\n", rtlight->cullmins[0], rtlight->cullmins[1], rtlight->cullmins[2], rtlight->cullmaxs[0], rtlight->cullmaxs[1], rtlight->cullmaxs[2], lighttris, shadowtris, shadowzpasstris, shadowzfailtris);
}

void R_RTLight_Uncompile(rtlight_t *rtlight)
{
      if (rtlight->compiled)
      {
            if (rtlight->static_meshchain_shadow_zpass)
                  Mod_ShadowMesh_Free(rtlight->static_meshchain_shadow_zpass);
            rtlight->static_meshchain_shadow_zpass = NULL;
            if (rtlight->static_meshchain_shadow_zfail)
                  Mod_ShadowMesh_Free(rtlight->static_meshchain_shadow_zfail);
            rtlight->static_meshchain_shadow_zfail = NULL;
            if (rtlight->static_meshchain_shadow_shadowmap)
                  Mod_ShadowMesh_Free(rtlight->static_meshchain_shadow_shadowmap);
            rtlight->static_meshchain_shadow_shadowmap = NULL;
            // these allocations are grouped
            if (rtlight->static_surfacelist)
                  Mem_Free(rtlight->static_surfacelist);
            rtlight->static_numleafs = 0;
            rtlight->static_numleafpvsbytes = 0;
            rtlight->static_leaflist = NULL;
            rtlight->static_leafpvs = NULL;
            rtlight->static_numsurfaces = 0;
            rtlight->static_surfacelist = NULL;
            rtlight->static_numshadowtrispvsbytes = 0;
            rtlight->static_shadowtrispvs = NULL;
            rtlight->static_numlighttrispvsbytes = 0;
            rtlight->static_lighttrispvs = NULL;
            rtlight->compiled = false;
      }
}

void R_Shadow_UncompileWorldLights(void)
{
      size_t lightindex;
      dlight_t *light;
      size_t range = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray); // checked
      for (lightindex = 0;lightindex < range;lightindex++)
      {
            light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
            if (!light)
                  continue;
            R_RTLight_Uncompile(&light->rtlight);
      }
}

void R_Shadow_ComputeShadowCasterCullingPlanes(rtlight_t *rtlight)
{
      int i, j;
      mplane_t plane;
      // reset the count of frustum planes
      // see rtlight->cached_frustumplanes definition for how much this array
      // can hold
      rtlight->cached_numfrustumplanes = 0;

      if (r_trippy.integer)
            return;

      // haven't implemented a culling path for ortho rendering
      if (!r_refdef.view.useperspective)
      {
            // check if the light is on screen and copy the 4 planes if it is
            for (i = 0;i < 4;i++)
                  if (PlaneDiff(rtlight->shadoworigin, &r_refdef.view.frustum[i]) < -0.03125)
                        break;
            if (i == 4)
                  for (i = 0;i < 4;i++)
                        rtlight->cached_frustumplanes[rtlight->cached_numfrustumplanes++] = r_refdef.view.frustum[i];
            return;
      }

#if 1
      // generate a deformed frustum that includes the light origin, this is
      // used to cull shadow casting surfaces that can not possibly cast a
      // shadow onto the visible light-receiving surfaces, which can be a
      // performance gain
      //
      // if the light origin is onscreen the result will be 4 planes exactly
      // if the light origin is offscreen on only one axis the result will
      // be exactly 5 planes (split-side case)
      // if the light origin is offscreen on two axes the result will be
      // exactly 4 planes (stretched corner case)
      for (i = 0;i < 4;i++)
      {
            // quickly reject standard frustum planes that put the light
            // origin outside the frustum
            if (PlaneDiff(rtlight->shadoworigin, &r_refdef.view.frustum[i]) < -0.03125)
                  continue;
            // copy the plane
            rtlight->cached_frustumplanes[rtlight->cached_numfrustumplanes++] = r_refdef.view.frustum[i];
      }
      // if all the standard frustum planes were accepted, the light is onscreen
      // otherwise we need to generate some more planes below...
      if (rtlight->cached_numfrustumplanes < 4)
      {
            // at least one of the stock frustum planes failed, so we need to
            // create one or two custom planes to enclose the light origin
            for (i = 0;i < 4;i++)
            {
                  // create a plane using the view origin and light origin, and a
                  // single point from the frustum corner set
                  TriangleNormal(r_refdef.view.origin, r_refdef.view.frustumcorner[i], rtlight->shadoworigin, plane.normal);
                  VectorNormalize(plane.normal);
                  plane.dist = DotProduct(r_refdef.view.origin, plane.normal);
                  // see if this plane is backwards and flip it if so
                  for (j = 0;j < 4;j++)
                        if (j != i && DotProduct(r_refdef.view.frustumcorner[j], plane.normal) - plane.dist < -0.03125)
                              break;
                  if (j < 4)
                  {
                        VectorNegate(plane.normal, plane.normal);
                        plane.dist *= -1;
                        // flipped plane, test again to see if it is now valid
                        for (j = 0;j < 4;j++)
                              if (j != i && DotProduct(r_refdef.view.frustumcorner[j], plane.normal) - plane.dist < -0.03125)
                                    break;
                        // if the plane is still not valid, then it is dividing the
                        // frustum and has to be rejected
                        if (j < 4)
                              continue;
                  }
                  // we have created a valid plane, compute extra info
                  PlaneClassify(&plane);
                  // copy the plane
                  rtlight->cached_frustumplanes[rtlight->cached_numfrustumplanes++] = plane;
#if 1
                  // if we've found 5 frustum planes then we have constructed a
                  // proper split-side case and do not need to keep searching for
                  // planes to enclose the light origin
                  if (rtlight->cached_numfrustumplanes == 5)
                        break;
#endif
            }
      }
#endif

#if 0
      for (i = 0;i < rtlight->cached_numfrustumplanes;i++)
      {
            plane = rtlight->cached_frustumplanes[i];
            Con_Printf("light %p plane #%i %f %f %f : %f (%f %f %f %f %f)\n", rtlight, i, plane.normal[0], plane.normal[1], plane.normal[2], plane.dist, PlaneDiff(r_refdef.view.frustumcorner[0], &plane), PlaneDiff(r_refdef.view.frustumcorner[1], &plane), PlaneDiff(r_refdef.view.frustumcorner[2], &plane), PlaneDiff(r_refdef.view.frustumcorner[3], &plane), PlaneDiff(rtlight->shadoworigin, &plane));
      }
#endif

#if 0
      // now add the light-space box planes if the light box is rotated, as any
      // caster outside the oriented light box is irrelevant (even if it passed
      // the worldspace light box, which is axial)
      if (rtlight->matrix_lighttoworld.m[0][0] != 1 || rtlight->matrix_lighttoworld.m[1][1] != 1 || rtlight->matrix_lighttoworld.m[2][2] != 1)
      {
            for (i = 0;i < 6;i++)
            {
                  vec3_t v;
                  VectorClear(v);
                  v[i >> 1] = (i & 1) ? -1 : 1;
                  Matrix4x4_Transform(&rtlight->matrix_lighttoworld, v, plane.normal);
                  VectorSubtract(plane.normal, rtlight->shadoworigin, plane.normal);
                  plane.dist = VectorNormalizeLength(plane.normal);
                  plane.dist += DotProduct(plane.normal, rtlight->shadoworigin);
                  rtlight->cached_frustumplanes[rtlight->cached_numfrustumplanes++] = plane;
            }
      }
#endif

#if 0
      // add the world-space reduced box planes
      for (i = 0;i < 6;i++)
      {
            VectorClear(plane.normal);
            plane.normal[i >> 1] = (i & 1) ? -1 : 1;
            plane.dist = (i & 1) ? -rtlight->cached_cullmaxs[i >> 1] : rtlight->cached_cullmins[i >> 1];
            rtlight->cached_frustumplanes[rtlight->cached_numfrustumplanes++] = plane;
      }
#endif

#if 0
      {
      int j, oldnum;
      vec3_t points[8];
      vec_t bestdist;
      // reduce all plane distances to tightly fit the rtlight cull box, which
      // is in worldspace
      VectorSet(points[0], rtlight->cached_cullmins[0], rtlight->cached_cullmins[1], rtlight->cached_cullmins[2]);
      VectorSet(points[1], rtlight->cached_cullmaxs[0], rtlight->cached_cullmins[1], rtlight->cached_cullmins[2]);
      VectorSet(points[2], rtlight->cached_cullmins[0], rtlight->cached_cullmaxs[1], rtlight->cached_cullmins[2]);
      VectorSet(points[3], rtlight->cached_cullmaxs[0], rtlight->cached_cullmaxs[1], rtlight->cached_cullmins[2]);
      VectorSet(points[4], rtlight->cached_cullmins[0], rtlight->cached_cullmins[1], rtlight->cached_cullmaxs[2]);
      VectorSet(points[5], rtlight->cached_cullmaxs[0], rtlight->cached_cullmins[1], rtlight->cached_cullmaxs[2]);
      VectorSet(points[6], rtlight->cached_cullmins[0], rtlight->cached_cullmaxs[1], rtlight->cached_cullmaxs[2]);
      VectorSet(points[7], rtlight->cached_cullmaxs[0], rtlight->cached_cullmaxs[1], rtlight->cached_cullmaxs[2]);
      oldnum = rtlight->cached_numfrustumplanes;
      rtlight->cached_numfrustumplanes = 0;
      for (j = 0;j < oldnum;j++)
      {
            // find the nearest point on the box to this plane
            bestdist = DotProduct(rtlight->cached_frustumplanes[j].normal, points[0]);
            for (i = 1;i < 8;i++)
            {
                  dist = DotProduct(rtlight->cached_frustumplanes[j].normal, points[i]);
                  if (bestdist > dist)
                        bestdist = dist;
            }
            Con_Printf("light %p %splane #%i %f %f %f : %f < %f\n", rtlight, rtlight->cached_frustumplanes[j].dist < bestdist + 0.03125 ? "^2" : "^1", j, rtlight->cached_frustumplanes[j].normal[0], rtlight->cached_frustumplanes[j].normal[1], rtlight->cached_frustumplanes[j].normal[2], rtlight->cached_frustumplanes[j].dist, bestdist);
            // if the nearest point is near or behind the plane, we want this
            // plane, otherwise the plane is useless as it won't cull anything
            if (rtlight->cached_frustumplanes[j].dist < bestdist + 0.03125)
            {
                  PlaneClassify(&rtlight->cached_frustumplanes[j]);
                  rtlight->cached_frustumplanes[rtlight->cached_numfrustumplanes++] = rtlight->cached_frustumplanes[j];
            }
      }
      }
#endif
}

void R_Shadow_DrawWorldShadow_ShadowMap(int numsurfaces, int *surfacelist, const unsigned char *trispvs, const unsigned char *surfacesides)
{
      shadowmesh_t *mesh;

      RSurf_ActiveWorldEntity();

      if (rsurface.rtlight->compiled && r_shadow_realtime_world_compile.integer && r_shadow_realtime_world_compileshadow.integer)
      {
            CHECKGLERROR
            GL_CullFace(GL_NONE);
            mesh = rsurface.rtlight->static_meshchain_shadow_shadowmap;
            for (;mesh;mesh = mesh->next)
            {
                  if (!mesh->sidetotals[r_shadow_shadowmapside])
                        continue;
                  r_refdef.stats.lights_shadowtriangles += mesh->sidetotals[r_shadow_shadowmapside];
                  if (mesh->vertex3fbuffer)
                        R_Mesh_PrepareVertices_Vertex3f(mesh->numverts, mesh->vertex3f, mesh->vertex3fbuffer);
                  else
                        R_Mesh_PrepareVertices_Vertex3f(mesh->numverts, mesh->vertex3f, mesh->vbo_vertexbuffer);
                  R_Mesh_Draw(0, mesh->numverts, mesh->sideoffsets[r_shadow_shadowmapside], mesh->sidetotals[r_shadow_shadowmapside], mesh->element3i, mesh->element3i_indexbuffer, mesh->element3i_bufferoffset, mesh->element3s, mesh->element3s_indexbuffer, mesh->element3s_bufferoffset);
            }
            CHECKGLERROR
      }
      else if (r_refdef.scene.worldentity->model)
            r_refdef.scene.worldmodel->DrawShadowMap(r_shadow_shadowmapside, r_refdef.scene.worldentity, rsurface.rtlight->shadoworigin, NULL, rsurface.rtlight->radius, numsurfaces, surfacelist, surfacesides, rsurface.rtlight->cached_cullmins, rsurface.rtlight->cached_cullmaxs);

      rsurface.entity = NULL; // used only by R_GetCurrentTexture and RSurf_ActiveWorldEntity/RSurf_ActiveModelEntity
}

void R_Shadow_DrawWorldShadow_ShadowVolume(int numsurfaces, int *surfacelist, const unsigned char *trispvs)
{
      qboolean zpass = false;
      shadowmesh_t *mesh;
      int t, tend;
      int surfacelistindex;
      msurface_t *surface;

      // if triangle neighbors are disabled, shadowvolumes are disabled
      if (r_refdef.scene.worldmodel->brush.shadowmesh ? !r_refdef.scene.worldmodel->brush.shadowmesh->neighbor3i : !r_refdef.scene.worldmodel->surfmesh.data_neighbor3i)
            return;

      RSurf_ActiveWorldEntity();

      if (rsurface.rtlight->compiled && r_shadow_realtime_world_compile.integer && r_shadow_realtime_world_compileshadow.integer)
      {
            CHECKGLERROR
            if (r_shadow_rendermode != R_SHADOW_RENDERMODE_VISIBLEVOLUMES)
            {
                  zpass = R_Shadow_UseZPass(r_refdef.scene.worldmodel->normalmins, r_refdef.scene.worldmodel->normalmaxs);
                  R_Shadow_RenderMode_StencilShadowVolumes(zpass);
            }
            mesh = zpass ? rsurface.rtlight->static_meshchain_shadow_zpass : rsurface.rtlight->static_meshchain_shadow_zfail;
            for (;mesh;mesh = mesh->next)
            {
                  r_refdef.stats.lights_shadowtriangles += mesh->numtriangles;
                  if (mesh->vertex3fbuffer)
                        R_Mesh_PrepareVertices_Vertex3f(mesh->numverts, mesh->vertex3f, mesh->vertex3fbuffer);
                  else
                        R_Mesh_PrepareVertices_Vertex3f(mesh->numverts, mesh->vertex3f, mesh->vbo_vertexbuffer);
                  if (r_shadow_rendermode == R_SHADOW_RENDERMODE_ZPASS_STENCIL)
                  {
                        // increment stencil if frontface is infront of depthbuffer
                        GL_CullFace(r_refdef.view.cullface_back);
                        R_SetStencil(true, 255, GL_KEEP, GL_KEEP, GL_INCR, GL_ALWAYS, 128, 255);
                        R_Mesh_Draw(0, mesh->numverts, 0, mesh->numtriangles, mesh->element3i, mesh->element3i_indexbuffer, mesh->element3i_bufferoffset, mesh->element3s, mesh->element3s_indexbuffer, mesh->element3s_bufferoffset);
                        // decrement stencil if backface is infront of depthbuffer
                        GL_CullFace(r_refdef.view.cullface_front);
                        R_SetStencil(true, 255, GL_KEEP, GL_KEEP, GL_DECR, GL_ALWAYS, 128, 255);
                  }
                  else if (r_shadow_rendermode == R_SHADOW_RENDERMODE_ZFAIL_STENCIL)
                  {
                        // decrement stencil if backface is behind depthbuffer
                        GL_CullFace(r_refdef.view.cullface_front);
                        R_SetStencil(true, 255, GL_KEEP, GL_DECR, GL_KEEP, GL_ALWAYS, 128, 255);
                        R_Mesh_Draw(0, mesh->numverts, 0, mesh->numtriangles, mesh->element3i, mesh->element3i_indexbuffer, mesh->element3i_bufferoffset, mesh->element3s, mesh->element3s_indexbuffer, mesh->element3s_bufferoffset);
                        // increment stencil if frontface is behind depthbuffer
                        GL_CullFace(r_refdef.view.cullface_back);
                        R_SetStencil(true, 255, GL_KEEP, GL_INCR, GL_KEEP, GL_ALWAYS, 128, 255);
                  }
                  R_Mesh_Draw(0, mesh->numverts, 0, mesh->numtriangles, mesh->element3i, mesh->element3i_indexbuffer, mesh->element3i_bufferoffset, mesh->element3s, mesh->element3s_indexbuffer, mesh->element3s_bufferoffset);
            }
            CHECKGLERROR
      }
      else if (numsurfaces && r_refdef.scene.worldmodel->brush.shadowmesh)
      {
            // use the shadow trispvs calculated earlier by GetLightInfo to cull world triangles on this dynamic light
            R_Shadow_PrepareShadowMark(r_refdef.scene.worldmodel->brush.shadowmesh->numtriangles);
            for (surfacelistindex = 0;surfacelistindex < numsurfaces;surfacelistindex++)
            {
                  surface = r_refdef.scene.worldmodel->data_surfaces + surfacelist[surfacelistindex];
                  for (t = surface->num_firstshadowmeshtriangle, tend = t + surface->num_triangles;t < tend;t++)
                        if (CHECKPVSBIT(trispvs, t))
                              shadowmarklist[numshadowmark++] = t;
            }
            R_Shadow_VolumeFromList(r_refdef.scene.worldmodel->brush.shadowmesh->numverts, r_refdef.scene.worldmodel->brush.shadowmesh->numtriangles, r_refdef.scene.worldmodel->brush.shadowmesh->vertex3f, r_refdef.scene.worldmodel->brush.shadowmesh->element3i, r_refdef.scene.worldmodel->brush.shadowmesh->neighbor3i, rsurface.rtlight->shadoworigin, NULL, rsurface.rtlight->radius + r_refdef.scene.worldmodel->radius*2 + r_shadow_projectdistance.value, numshadowmark, shadowmarklist, r_refdef.scene.worldmodel->normalmins, r_refdef.scene.worldmodel->normalmaxs);
      }
      else if (numsurfaces)
      {
            r_refdef.scene.worldmodel->DrawShadowVolume(r_refdef.scene.worldentity, rsurface.rtlight->shadoworigin, NULL, rsurface.rtlight->radius, numsurfaces, surfacelist, rsurface.rtlight->cached_cullmins, rsurface.rtlight->cached_cullmaxs);
      }

      rsurface.entity = NULL; // used only by R_GetCurrentTexture and RSurf_ActiveWorldEntity/RSurf_ActiveModelEntity
}

void R_Shadow_DrawEntityShadow(entity_render_t *ent)
{
      vec3_t relativeshadoworigin, relativeshadowmins, relativeshadowmaxs;
      vec_t relativeshadowradius;
      RSurf_ActiveModelEntity(ent, false, false, false);
      Matrix4x4_Transform(&ent->inversematrix, rsurface.rtlight->shadoworigin, relativeshadoworigin);
      // we need to re-init the shader for each entity because the matrix changed
      relativeshadowradius = rsurface.rtlight->radius / ent->scale;
      relativeshadowmins[0] = relativeshadoworigin[0] - relativeshadowradius;
      relativeshadowmins[1] = relativeshadoworigin[1] - relativeshadowradius;
      relativeshadowmins[2] = relativeshadoworigin[2] - relativeshadowradius;
      relativeshadowmaxs[0] = relativeshadoworigin[0] + relativeshadowradius;
      relativeshadowmaxs[1] = relativeshadoworigin[1] + relativeshadowradius;
      relativeshadowmaxs[2] = relativeshadoworigin[2] + relativeshadowradius;
      switch (r_shadow_rendermode)
      {
      case R_SHADOW_RENDERMODE_SHADOWMAP2D:
            ent->model->DrawShadowMap(r_shadow_shadowmapside, ent, relativeshadoworigin, NULL, relativeshadowradius, ent->model->nummodelsurfaces, ent->model->sortedmodelsurfaces, NULL, relativeshadowmins, relativeshadowmaxs);
            break;
      default:
            ent->model->DrawShadowVolume(ent, relativeshadoworigin, NULL, relativeshadowradius, ent->model->nummodelsurfaces, ent->model->sortedmodelsurfaces, relativeshadowmins, relativeshadowmaxs);
            break;
      }
      rsurface.entity = NULL; // used only by R_GetCurrentTexture and RSurf_ActiveWorldEntity/RSurf_ActiveModelEntity
}

void R_Shadow_SetupEntityLight(const entity_render_t *ent)
{
      // set up properties for rendering light onto this entity
      RSurf_ActiveModelEntity(ent, true, true, false);
      Matrix4x4_Concat(&rsurface.entitytolight, &rsurface.rtlight->matrix_worldtolight, &ent->matrix);
      Matrix4x4_Concat(&rsurface.entitytoattenuationxyz, &matrix_attenuationxyz, &rsurface.entitytolight);
      Matrix4x4_Concat(&rsurface.entitytoattenuationz, &matrix_attenuationz, &rsurface.entitytolight);
      Matrix4x4_Transform(&ent->inversematrix, rsurface.rtlight->shadoworigin, rsurface.entitylightorigin);
}

void R_Shadow_DrawWorldLight(int numsurfaces, int *surfacelist, const unsigned char *lighttrispvs)
{
      if (!r_refdef.scene.worldmodel->DrawLight)
            return;

      // set up properties for rendering light onto this entity
      RSurf_ActiveWorldEntity();
      rsurface.entitytolight = rsurface.rtlight->matrix_worldtolight;
      Matrix4x4_Concat(&rsurface.entitytoattenuationxyz, &matrix_attenuationxyz, &rsurface.entitytolight);
      Matrix4x4_Concat(&rsurface.entitytoattenuationz, &matrix_attenuationz, &rsurface.entitytolight);
      VectorCopy(rsurface.rtlight->shadoworigin, rsurface.entitylightorigin);

      r_refdef.scene.worldmodel->DrawLight(r_refdef.scene.worldentity, numsurfaces, surfacelist, lighttrispvs);

      rsurface.entity = NULL; // used only by R_GetCurrentTexture and RSurf_ActiveWorldEntity/RSurf_ActiveModelEntity
}

void R_Shadow_DrawEntityLight(entity_render_t *ent)
{
      dp_model_t *model = ent->model;
      if (!model->DrawLight)
            return;

      R_Shadow_SetupEntityLight(ent);

      model->DrawLight(ent, model->nummodelsurfaces, model->sortedmodelsurfaces, NULL);

      rsurface.entity = NULL; // used only by R_GetCurrentTexture and RSurf_ActiveWorldEntity/RSurf_ActiveModelEntity
}

void R_Shadow_PrepareLight(rtlight_t *rtlight)
{
      int i;
      float f;
      int numleafs, numsurfaces;
      int *leaflist, *surfacelist;
      unsigned char *leafpvs;
      unsigned char *shadowtrispvs;
      unsigned char *lighttrispvs;
      //unsigned char *surfacesides;
      int numlightentities;
      int numlightentities_noselfshadow;
      int numshadowentities;
      int numshadowentities_noselfshadow;
      static entity_render_t *lightentities[MAX_EDICTS];
      static entity_render_t *lightentities_noselfshadow[MAX_EDICTS];
      static entity_render_t *shadowentities[MAX_EDICTS];
      static entity_render_t *shadowentities_noselfshadow[MAX_EDICTS];
      qboolean nolight;

      rtlight->draw = false;

      // skip lights that don't light because of ambientscale+diffusescale+specularscale being 0 (corona only lights)
      // skip lights that are basically invisible (color 0 0 0)
      nolight = VectorLength2(rtlight->color) * (rtlight->ambientscale + rtlight->diffusescale + rtlight->specularscale) < (1.0f / 1048576.0f);

      // loading is done before visibility checks because loading should happen
      // all at once at the start of a level, not when it stalls gameplay.
      // (especially important to benchmarks)
      // compile light
      if (rtlight->isstatic && !nolight && (!rtlight->compiled || (rtlight->shadow && rtlight->shadowmode != (int)r_shadow_shadowmode)) && r_shadow_realtime_world_compile.integer)
      {
            if (rtlight->compiled)
                  R_RTLight_Uncompile(rtlight);
            R_RTLight_Compile(rtlight);
      }

      // load cubemap
      rtlight->currentcubemap = rtlight->cubemapname[0] ? R_GetCubemap(rtlight->cubemapname) : r_texture_whitecube;

      // look up the light style value at this time
      f = (rtlight->style >= 0 ? r_refdef.scene.rtlightstylevalue[rtlight->style] : 1) * r_shadow_lightintensityscale.value;
      VectorScale(rtlight->color, f, rtlight->currentcolor);
      /*
      if (rtlight->selected)
      {
            f = 2 + sin(realtime * M_PI * 4.0);
            VectorScale(rtlight->currentcolor, f, rtlight->currentcolor);
      }
      */

      // if lightstyle is currently off, don't draw the light
      if (VectorLength2(rtlight->currentcolor) < (1.0f / 1048576.0f))
            return;

      // skip processing on corona-only lights
      if (nolight)
            return;

      // if the light box is offscreen, skip it
      if (R_CullBox(rtlight->cullmins, rtlight->cullmaxs))
            return;

      VectorCopy(rtlight->cullmins, rtlight->cached_cullmins);
      VectorCopy(rtlight->cullmaxs, rtlight->cached_cullmaxs);

      R_Shadow_ComputeShadowCasterCullingPlanes(rtlight);

      if (rtlight->compiled && r_shadow_realtime_world_compile.integer)
      {
            // compiled light, world available and can receive realtime lighting
            // retrieve leaf information
            numleafs = rtlight->static_numleafs;
            leaflist = rtlight->static_leaflist;
            leafpvs = rtlight->static_leafpvs;
            numsurfaces = rtlight->static_numsurfaces;
            surfacelist = rtlight->static_surfacelist;
            //surfacesides = NULL;
            shadowtrispvs = rtlight->static_shadowtrispvs;
            lighttrispvs = rtlight->static_lighttrispvs;
      }
      else if (r_refdef.scene.worldmodel && r_refdef.scene.worldmodel->GetLightInfo)
      {
            // dynamic light, world available and can receive realtime lighting
            // calculate lit surfaces and leafs
            r_refdef.scene.worldmodel->GetLightInfo(r_refdef.scene.worldentity, rtlight->shadoworigin, rtlight->radius, rtlight->cached_cullmins, rtlight->cached_cullmaxs, r_shadow_buffer_leaflist, r_shadow_buffer_leafpvs, &numleafs, r_shadow_buffer_surfacelist, r_shadow_buffer_surfacepvs, &numsurfaces, r_shadow_buffer_shadowtrispvs, r_shadow_buffer_lighttrispvs, r_shadow_buffer_visitingleafpvs, rtlight->cached_numfrustumplanes, rtlight->cached_frustumplanes);
            R_Shadow_ComputeShadowCasterCullingPlanes(rtlight);
            leaflist = r_shadow_buffer_leaflist;
            leafpvs = r_shadow_buffer_leafpvs;
            surfacelist = r_shadow_buffer_surfacelist;
            //surfacesides = r_shadow_buffer_surfacesides;
            shadowtrispvs = r_shadow_buffer_shadowtrispvs;
            lighttrispvs = r_shadow_buffer_lighttrispvs;
            // if the reduced leaf bounds are offscreen, skip it
            if (R_CullBox(rtlight->cached_cullmins, rtlight->cached_cullmaxs))
                  return;
      }
      else
      {
            // no world
            numleafs = 0;
            leaflist = NULL;
            leafpvs = NULL;
            numsurfaces = 0;
            surfacelist = NULL;
            //surfacesides = NULL;
            shadowtrispvs = NULL;
            lighttrispvs = NULL;
      }
      // check if light is illuminating any visible leafs
      if (numleafs)
      {
            for (i = 0;i < numleafs;i++)
                  if (r_refdef.viewcache.world_leafvisible[leaflist[i]])
                        break;
            if (i == numleafs)
                  return;
      }

      // make a list of lit entities and shadow casting entities
      numlightentities = 0;
      numlightentities_noselfshadow = 0;
      numshadowentities = 0;
      numshadowentities_noselfshadow = 0;

      // add dynamic entities that are lit by the light
      for (i = 0;i < r_refdef.scene.numentities;i++)
      {
            dp_model_t *model;
            entity_render_t *ent = r_refdef.scene.entities[i];
            vec3_t org;
            if (!BoxesOverlap(ent->mins, ent->maxs, rtlight->cached_cullmins, rtlight->cached_cullmaxs))
                  continue;
            // skip the object entirely if it is not within the valid
            // shadow-casting region (which includes the lit region)
            if (R_CullBoxCustomPlanes(ent->mins, ent->maxs, rtlight->cached_numfrustumplanes, rtlight->cached_frustumplanes))
                  continue;
            if (!(model = ent->model))
                  continue;
            if (r_refdef.viewcache.entityvisible[i] && model->DrawLight && (ent->flags & RENDER_LIGHT))
            {
                  // this entity wants to receive light, is visible, and is
                  // inside the light box
                  // TODO: check if the surfaces in the model can receive light
                  // so now check if it's in a leaf seen by the light
                  if (r_refdef.scene.worldmodel && r_refdef.scene.worldmodel->brush.BoxTouchingLeafPVS && !r_refdef.scene.worldmodel->brush.BoxTouchingLeafPVS(r_refdef.scene.worldmodel, leafpvs, ent->mins, ent->maxs))
                        continue;
                  if (ent->flags & RENDER_NOSELFSHADOW)
                        lightentities_noselfshadow[numlightentities_noselfshadow++] = ent;
                  else
                        lightentities[numlightentities++] = ent;
                  // since it is lit, it probably also casts a shadow...
                  // about the VectorDistance2 - light emitting entities should not cast their own shadow
                  Matrix4x4_OriginFromMatrix(&ent->matrix, org);
                  if ((ent->flags & RENDER_SHADOW) && model->DrawShadowVolume && VectorDistance2(org, rtlight->shadoworigin) > 0.1)
                  {
                        // note: exterior models without the RENDER_NOSELFSHADOW
                        // flag still create a RENDER_NOSELFSHADOW shadow but
                        // are lit normally, this means that they are
                        // self-shadowing but do not shadow other
                        // RENDER_NOSELFSHADOW entities such as the gun
                        // (very weird, but keeps the player shadow off the gun)
                        if (ent->flags & (RENDER_NOSELFSHADOW | RENDER_EXTERIORMODEL))
                              shadowentities_noselfshadow[numshadowentities_noselfshadow++] = ent;
                        else
                              shadowentities[numshadowentities++] = ent;
                  }
            }
            else if (ent->flags & RENDER_SHADOW)
            {
                  // this entity is not receiving light, but may still need to
                  // cast a shadow...
                  // TODO: check if the surfaces in the model can cast shadow
                  // now check if it is in a leaf seen by the light
                  if (r_refdef.scene.worldmodel && r_refdef.scene.worldmodel->brush.BoxTouchingLeafPVS && !r_refdef.scene.worldmodel->brush.BoxTouchingLeafPVS(r_refdef.scene.worldmodel, leafpvs, ent->mins, ent->maxs))
                        continue;
                  // about the VectorDistance2 - light emitting entities should not cast their own shadow
                  Matrix4x4_OriginFromMatrix(&ent->matrix, org);
                  if ((ent->flags & RENDER_SHADOW) && model->DrawShadowVolume && VectorDistance2(org, rtlight->shadoworigin) > 0.1)
                  {
                        if (ent->flags & (RENDER_NOSELFSHADOW | RENDER_EXTERIORMODEL))
                              shadowentities_noselfshadow[numshadowentities_noselfshadow++] = ent;
                        else
                              shadowentities[numshadowentities++] = ent;
                  }
            }
      }

      // return if there's nothing at all to light
      if (numsurfaces + numlightentities + numlightentities_noselfshadow == 0)
            return;

      // count this light in the r_speeds
      r_refdef.stats.lights++;

      // flag it as worth drawing later
      rtlight->draw = true;

      // cache all the animated entities that cast a shadow but are not visible
      for (i = 0;i < numshadowentities;i++)
            if (!shadowentities[i]->animcache_vertex3f)
                  R_AnimCache_GetEntity(shadowentities[i], false, false);
      for (i = 0;i < numshadowentities_noselfshadow;i++)
            if (!shadowentities_noselfshadow[i]->animcache_vertex3f)
                  R_AnimCache_GetEntity(shadowentities_noselfshadow[i], false, false);

      // allocate some temporary memory for rendering this light later in the frame
      // reusable buffers need to be copied, static data can be used as-is
      rtlight->cached_numlightentities               = numlightentities;
      rtlight->cached_numlightentities_noselfshadow  = numlightentities_noselfshadow;
      rtlight->cached_numshadowentities              = numshadowentities;
      rtlight->cached_numshadowentities_noselfshadow = numshadowentities_noselfshadow;
      rtlight->cached_numsurfaces                    = numsurfaces;
      rtlight->cached_lightentities                  = (entity_render_t**)R_FrameData_Store(numlightentities*sizeof(entity_render_t*), (void*)lightentities);
      rtlight->cached_lightentities_noselfshadow     = (entity_render_t**)R_FrameData_Store(numlightentities_noselfshadow*sizeof(entity_render_t*), (void*)lightentities_noselfshadow);
      rtlight->cached_shadowentities                 = (entity_render_t**)R_FrameData_Store(numshadowentities*sizeof(entity_render_t*), (void*)shadowentities);
      rtlight->cached_shadowentities_noselfshadow    = (entity_render_t**)R_FrameData_Store(numshadowentities_noselfshadow*sizeof(entity_render_t *), (void*)shadowentities_noselfshadow);
      if (shadowtrispvs == r_shadow_buffer_shadowtrispvs)
      {
            int numshadowtrispvsbytes = (((r_refdef.scene.worldmodel->brush.shadowmesh ? r_refdef.scene.worldmodel->brush.shadowmesh->numtriangles : r_refdef.scene.worldmodel->surfmesh.num_triangles) + 7) >> 3);
            int numlighttrispvsbytes = ((r_refdef.scene.worldmodel->surfmesh.num_triangles + 7) >> 3);
            rtlight->cached_shadowtrispvs                  =   (unsigned char *)R_FrameData_Store(numshadowtrispvsbytes, shadowtrispvs);
            rtlight->cached_lighttrispvs                   =   (unsigned char *)R_FrameData_Store(numlighttrispvsbytes, lighttrispvs);
            rtlight->cached_surfacelist                    =              (int*)R_FrameData_Store(numsurfaces*sizeof(int), (void*)surfacelist);
      }
      else
      {
            // compiled light data
            rtlight->cached_shadowtrispvs = shadowtrispvs;
            rtlight->cached_lighttrispvs = lighttrispvs;
            rtlight->cached_surfacelist = surfacelist;
      }
}

void R_Shadow_DrawLight(rtlight_t *rtlight)
{
      int i;
      int numsurfaces;
      unsigned char *shadowtrispvs, *lighttrispvs, *surfacesides;
      int numlightentities;
      int numlightentities_noselfshadow;
      int numshadowentities;
      int numshadowentities_noselfshadow;
      entity_render_t **lightentities;
      entity_render_t **lightentities_noselfshadow;
      entity_render_t **shadowentities;
      entity_render_t **shadowentities_noselfshadow;
      int *surfacelist;
      static unsigned char entitysides[MAX_EDICTS];
      static unsigned char entitysides_noselfshadow[MAX_EDICTS];
      vec3_t nearestpoint;
      vec_t distance;
      qboolean castshadows;
      int lodlinear;

      // check if we cached this light this frame (meaning it is worth drawing)
      if (!rtlight->draw)
            return;

      numlightentities = rtlight->cached_numlightentities;
      numlightentities_noselfshadow = rtlight->cached_numlightentities_noselfshadow;
      numshadowentities = rtlight->cached_numshadowentities;
      numshadowentities_noselfshadow = rtlight->cached_numshadowentities_noselfshadow;
      numsurfaces = rtlight->cached_numsurfaces;
      lightentities = rtlight->cached_lightentities;
      lightentities_noselfshadow = rtlight->cached_lightentities_noselfshadow;
      shadowentities = rtlight->cached_shadowentities;
      shadowentities_noselfshadow = rtlight->cached_shadowentities_noselfshadow;
      shadowtrispvs = rtlight->cached_shadowtrispvs;
      lighttrispvs = rtlight->cached_lighttrispvs;
      surfacelist = rtlight->cached_surfacelist;

      // set up a scissor rectangle for this light
      if (R_Shadow_ScissorForBBox(rtlight->cached_cullmins, rtlight->cached_cullmaxs))
            return;

      // don't let sound skip if going slow
      if (r_refdef.scene.extraupdate)
            S_ExtraUpdate ();

      // make this the active rtlight for rendering purposes
      R_Shadow_RenderMode_ActiveLight(rtlight);

      if (r_showshadowvolumes.integer && r_refdef.view.showdebug && numsurfaces + numshadowentities + numshadowentities_noselfshadow && rtlight->shadow && (rtlight->isstatic ? r_refdef.scene.rtworldshadows : r_refdef.scene.rtdlightshadows))
      {
            // optionally draw visible shape of the shadow volumes
            // for performance analysis by level designers
            R_Shadow_RenderMode_VisibleShadowVolumes();
            if (numsurfaces)
                  R_Shadow_DrawWorldShadow_ShadowVolume(numsurfaces, surfacelist, shadowtrispvs);
            for (i = 0;i < numshadowentities;i++)
                  R_Shadow_DrawEntityShadow(shadowentities[i]);
            for (i = 0;i < numshadowentities_noselfshadow;i++)
                  R_Shadow_DrawEntityShadow(shadowentities_noselfshadow[i]);
            R_Shadow_RenderMode_VisibleLighting(false, false);
      }

      if (r_showlighting.integer && r_refdef.view.showdebug && numsurfaces + numlightentities + numlightentities_noselfshadow)
      {
            // optionally draw the illuminated areas
            // for performance analysis by level designers
            R_Shadow_RenderMode_VisibleLighting(false, false);
            if (numsurfaces)
                  R_Shadow_DrawWorldLight(numsurfaces, surfacelist, lighttrispvs);
            for (i = 0;i < numlightentities;i++)
                  R_Shadow_DrawEntityLight(lightentities[i]);
            for (i = 0;i < numlightentities_noselfshadow;i++)
                  R_Shadow_DrawEntityLight(lightentities_noselfshadow[i]);
      }

      castshadows = numsurfaces + numshadowentities + numshadowentities_noselfshadow > 0 && rtlight->shadow && (rtlight->isstatic ? r_refdef.scene.rtworldshadows : r_refdef.scene.rtdlightshadows);

      nearestpoint[0] = bound(rtlight->cullmins[0], r_refdef.view.origin[0], rtlight->cullmaxs[0]);
      nearestpoint[1] = bound(rtlight->cullmins[1], r_refdef.view.origin[1], rtlight->cullmaxs[1]);
      nearestpoint[2] = bound(rtlight->cullmins[2], r_refdef.view.origin[2], rtlight->cullmaxs[2]);
      distance = VectorDistance(nearestpoint, r_refdef.view.origin);

      lodlinear = (rtlight->radius * r_shadow_shadowmapping_precision.value) / sqrt(max(1.0f, distance/rtlight->radius));
      //lodlinear = (int)(r_shadow_shadowmapping_lod_bias.value + r_shadow_shadowmapping_lod_scale.value * rtlight->radius / max(1.0f, distance));
      lodlinear = bound(r_shadow_shadowmapping_minsize.integer, lodlinear, r_shadow_shadowmapmaxsize);

      if (castshadows && r_shadow_shadowmode == R_SHADOW_SHADOWMODE_SHADOWMAP2D)
      {
            float borderbias;
            int side;
            int size;
            int castermask = 0;
            int receivermask = 0;
            matrix4x4_t radiustolight = rtlight->matrix_worldtolight;
            Matrix4x4_Abs(&radiustolight);

            r_shadow_shadowmaplod = 0;
            for (i = 1;i < R_SHADOW_SHADOWMAP_NUMCUBEMAPS;i++)
                  if ((r_shadow_shadowmapmaxsize >> i) > lodlinear)
                        r_shadow_shadowmaplod = i;

            size = bound(r_shadow_shadowmapborder, lodlinear, r_shadow_shadowmapmaxsize);
                  
            borderbias = r_shadow_shadowmapborder / (float)(size - r_shadow_shadowmapborder);

            surfacesides = NULL;
            if (numsurfaces)
            {
                  if (rtlight->compiled && r_shadow_realtime_world_compile.integer && r_shadow_realtime_world_compileshadow.integer)
                  {
                        castermask = rtlight->static_shadowmap_casters;
                        receivermask = rtlight->static_shadowmap_receivers;
                  }
                  else
                  {
                        surfacesides = r_shadow_buffer_surfacesides;
                        for(i = 0;i < numsurfaces;i++)
                        {
                              msurface_t *surface = r_refdef.scene.worldmodel->data_surfaces + surfacelist[i];
                              surfacesides[i] = R_Shadow_CalcBBoxSideMask(surface->mins, surface->maxs, &rtlight->matrix_worldtolight, &radiustolight, borderbias);           
                              castermask |= surfacesides[i];
                              receivermask |= surfacesides[i];
                        }
                  }
            }
            if (receivermask < 0x3F) 
            {
                  for (i = 0;i < numlightentities;i++)
                        receivermask |= R_Shadow_CalcEntitySideMask(lightentities[i], &rtlight->matrix_worldtolight, &radiustolight, borderbias);
                  if (receivermask < 0x3F)
                        for(i = 0; i < numlightentities_noselfshadow;i++)
                              receivermask |= R_Shadow_CalcEntitySideMask(lightentities_noselfshadow[i], &rtlight->matrix_worldtolight, &radiustolight, borderbias);
            }

            receivermask &= R_Shadow_CullFrustumSides(rtlight, size, r_shadow_shadowmapborder);

            if (receivermask)
            {
                  for (i = 0;i < numshadowentities;i++)
                        castermask |= (entitysides[i] = R_Shadow_CalcEntitySideMask(shadowentities[i], &rtlight->matrix_worldtolight, &radiustolight, borderbias));
                  for (i = 0;i < numshadowentities_noselfshadow;i++)
                        castermask |= (entitysides_noselfshadow[i] = R_Shadow_CalcEntitySideMask(shadowentities_noselfshadow[i], &rtlight->matrix_worldtolight, &radiustolight, borderbias)); 
            }

            //Con_Printf("distance %f lodlinear %i (lod %i) size %i\n", distance, lodlinear, r_shadow_shadowmaplod, size);

            // render shadow casters into 6 sided depth texture
            for (side = 0;side < 6;side++) if (receivermask & (1 << side))
            {
                  R_Shadow_RenderMode_ShadowMap(side, receivermask, size);
                  if (! (castermask & (1 << side))) continue;
                  if (numsurfaces)
                        R_Shadow_DrawWorldShadow_ShadowMap(numsurfaces, surfacelist, shadowtrispvs, surfacesides);
                  for (i = 0;i < numshadowentities;i++) if (entitysides[i] & (1 << side))
                        R_Shadow_DrawEntityShadow(shadowentities[i]);
            }

            if (numlightentities_noselfshadow)
            {
                  // render lighting using the depth texture as shadowmap
                  // draw lighting in the unmasked areas
                  R_Shadow_RenderMode_Lighting(false, false, true);
                  for (i = 0;i < numlightentities_noselfshadow;i++)
                        R_Shadow_DrawEntityLight(lightentities_noselfshadow[i]);
            }

            // render shadow casters into 6 sided depth texture
            if (numshadowentities_noselfshadow)
            {
                  for (side = 0;side < 6;side++) if ((receivermask & castermask) & (1 << side))
                  {
                        R_Shadow_RenderMode_ShadowMap(side, 0, size);
                        for (i = 0;i < numshadowentities_noselfshadow;i++) if (entitysides_noselfshadow[i] & (1 << side))
                              R_Shadow_DrawEntityShadow(shadowentities_noselfshadow[i]);
                  }
            }

            // render lighting using the depth texture as shadowmap
            // draw lighting in the unmasked areas
            R_Shadow_RenderMode_Lighting(false, false, true);
            // draw lighting in the unmasked areas
            if (numsurfaces)
                  R_Shadow_DrawWorldLight(numsurfaces, surfacelist, lighttrispvs);
            for (i = 0;i < numlightentities;i++)
                  R_Shadow_DrawEntityLight(lightentities[i]);
      }
      else if (castshadows && vid.stencil)
      {
            // draw stencil shadow volumes to mask off pixels that are in shadow
            // so that they won't receive lighting
            GL_Scissor(r_shadow_lightscissor[0], r_shadow_lightscissor[1], r_shadow_lightscissor[2], r_shadow_lightscissor[3]);
            R_Shadow_ClearStencil();

            if (numsurfaces)
                  R_Shadow_DrawWorldShadow_ShadowVolume(numsurfaces, surfacelist, shadowtrispvs);
            for (i = 0;i < numshadowentities;i++)
                  R_Shadow_DrawEntityShadow(shadowentities[i]);

            // draw lighting in the unmasked areas
            R_Shadow_RenderMode_Lighting(true, false, false);
            for (i = 0;i < numlightentities_noselfshadow;i++)
                  R_Shadow_DrawEntityLight(lightentities_noselfshadow[i]);

            for (i = 0;i < numshadowentities_noselfshadow;i++)
                  R_Shadow_DrawEntityShadow(shadowentities_noselfshadow[i]);

            // draw lighting in the unmasked areas
            R_Shadow_RenderMode_Lighting(true, false, false);
            if (numsurfaces)
                  R_Shadow_DrawWorldLight(numsurfaces, surfacelist, lighttrispvs);
            for (i = 0;i < numlightentities;i++)
                  R_Shadow_DrawEntityLight(lightentities[i]);
      }
      else
      {
            // draw lighting in the unmasked areas
            R_Shadow_RenderMode_Lighting(false, false, false);
            if (numsurfaces)
                  R_Shadow_DrawWorldLight(numsurfaces, surfacelist, lighttrispvs);
            for (i = 0;i < numlightentities;i++)
                  R_Shadow_DrawEntityLight(lightentities[i]);
            for (i = 0;i < numlightentities_noselfshadow;i++)
                  R_Shadow_DrawEntityLight(lightentities_noselfshadow[i]);
      }

      if (r_shadow_usingdeferredprepass)
      {
            // when rendering deferred lighting, we simply rasterize the box
            if (castshadows && r_shadow_shadowmode == R_SHADOW_SHADOWMODE_SHADOWMAP2D)
                  R_Shadow_RenderMode_DrawDeferredLight(false, true);
            else if (castshadows && vid.stencil)
                  R_Shadow_RenderMode_DrawDeferredLight(true, false);
            else
                  R_Shadow_RenderMode_DrawDeferredLight(false, false);
      }
}

static void R_Shadow_FreeDeferred(void)
{
      R_Mesh_DestroyFramebufferObject(r_shadow_prepassgeometryfbo);
      r_shadow_prepassgeometryfbo = 0;

      R_Mesh_DestroyFramebufferObject(r_shadow_prepasslightingdiffusespecularfbo);
      r_shadow_prepasslightingdiffusespecularfbo = 0;

      R_Mesh_DestroyFramebufferObject(r_shadow_prepasslightingdiffusefbo);
      r_shadow_prepasslightingdiffusefbo = 0;

      if (r_shadow_prepassgeometrydepthtexture)
            R_FreeTexture(r_shadow_prepassgeometrydepthtexture);
      r_shadow_prepassgeometrydepthtexture = NULL;

      if (r_shadow_prepassgeometrydepthcolortexture)
            R_FreeTexture(r_shadow_prepassgeometrydepthcolortexture);
      r_shadow_prepassgeometrydepthcolortexture = NULL;

      if (r_shadow_prepassgeometrynormalmaptexture)
            R_FreeTexture(r_shadow_prepassgeometrynormalmaptexture);
      r_shadow_prepassgeometrynormalmaptexture = NULL;

      if (r_shadow_prepasslightingdiffusetexture)
            R_FreeTexture(r_shadow_prepasslightingdiffusetexture);
      r_shadow_prepasslightingdiffusetexture = NULL;

      if (r_shadow_prepasslightingspeculartexture)
            R_FreeTexture(r_shadow_prepasslightingspeculartexture);
      r_shadow_prepasslightingspeculartexture = NULL;
}

void R_Shadow_DrawPrepass(void)
{
      int i;
      int flag;
      int lnum;
      size_t lightindex;
      dlight_t *light;
      size_t range;
      entity_render_t *ent;
      float clearcolor[4];

      R_Mesh_ResetTextureState();
      GL_DepthMask(true);
      GL_ColorMask(1,1,1,1);
      GL_BlendFunc(GL_ONE, GL_ZERO);
      GL_Color(1,1,1,1);
      GL_DepthTest(true);
      R_Mesh_SetRenderTargets(r_shadow_prepassgeometryfbo, r_shadow_prepassgeometrydepthtexture, r_shadow_prepassgeometrynormalmaptexture, r_shadow_prepassgeometrydepthcolortexture, NULL, NULL);
      Vector4Set(clearcolor, 0.5f,0.5f,0.5f,1.0f);
      GL_Clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT, clearcolor, 1.0f, 0);
      if (r_timereport_active)
            R_TimeReport("prepasscleargeom");

      if (cl.csqc_vidvars.drawworld && r_refdef.scene.worldmodel && r_refdef.scene.worldmodel->DrawPrepass)
            r_refdef.scene.worldmodel->DrawPrepass(r_refdef.scene.worldentity);
      if (r_timereport_active)
            R_TimeReport("prepassworld");

      for (i = 0;i < r_refdef.scene.numentities;i++)
      {
            if (!r_refdef.viewcache.entityvisible[i])
                  continue;
            ent = r_refdef.scene.entities[i];
            if (ent->model && ent->model->DrawPrepass != NULL)
                  ent->model->DrawPrepass(ent);
      }

      if (r_timereport_active)
            R_TimeReport("prepassmodels");

      GL_DepthMask(false);
      GL_ColorMask(1,1,1,1);
      GL_Color(1,1,1,1);
      GL_DepthTest(true);
      R_Mesh_SetRenderTargets(r_shadow_prepasslightingdiffusespecularfbo, r_shadow_prepassgeometrydepthtexture, r_shadow_prepasslightingdiffusetexture, r_shadow_prepasslightingspeculartexture, NULL, NULL);
      Vector4Set(clearcolor, 0, 0, 0, 0);
      GL_Clear(GL_COLOR_BUFFER_BIT, clearcolor, 1.0f, 0);
      if (r_timereport_active)
            R_TimeReport("prepassclearlit");

      R_Shadow_RenderMode_Begin();

      flag = r_refdef.scene.rtworld ? LIGHTFLAG_REALTIMEMODE : LIGHTFLAG_NORMALMODE;
      if (r_shadow_debuglight.integer >= 0)
      {
            lightindex = r_shadow_debuglight.integer;
            light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
            if (light && (light->flags & flag) && light->rtlight.draw)
                  R_Shadow_DrawLight(&light->rtlight);
      }
      else
      {
            range = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray); // checked
            for (lightindex = 0;lightindex < range;lightindex++)
            {
                  light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
                  if (light && (light->flags & flag) && light->rtlight.draw)
                        R_Shadow_DrawLight(&light->rtlight);
            }
      }
      if (r_refdef.scene.rtdlight)
            for (lnum = 0;lnum < r_refdef.scene.numlights;lnum++)
                  if (r_refdef.scene.lights[lnum]->draw)
                        R_Shadow_DrawLight(r_refdef.scene.lights[lnum]);

      R_Mesh_SetMainRenderTargets();

      R_Shadow_RenderMode_End();

      if (r_timereport_active)
            R_TimeReport("prepasslights");
}

void R_Shadow_DrawLightSprites(void);
void R_Shadow_PrepareLights(void)
{
      int flag;
      int lnum;
      size_t lightindex;
      dlight_t *light;
      size_t range;
      float f;
      GLenum status;

      if (r_shadow_shadowmapmaxsize != bound(1, r_shadow_shadowmapping_maxsize.integer, (int)vid.maxtexturesize_2d / 4) ||
            (r_shadow_shadowmode != R_SHADOW_SHADOWMODE_STENCIL) != (r_shadow_shadowmapping.integer || r_shadow_deferred.integer) ||
            r_shadow_shadowmapvsdct != (r_shadow_shadowmapping_vsdct.integer != 0 && vid.renderpath == RENDERPATH_GL20) || 
            r_shadow_shadowmapfilterquality != r_shadow_shadowmapping_filterquality.integer || 
            r_shadow_shadowmapdepthbits != r_shadow_shadowmapping_depthbits.integer || 
            r_shadow_shadowmapborder != bound(0, r_shadow_shadowmapping_bordersize.integer, 16))
            R_Shadow_FreeShadowMaps();

      r_shadow_usingshadowmaportho = false;

      switch (vid.renderpath)
      {
      case RENDERPATH_GL20:
      case RENDERPATH_D3D9:
      case RENDERPATH_D3D10:
      case RENDERPATH_D3D11:
      case RENDERPATH_SOFT:
      case RENDERPATH_GLES2:
            if (!r_shadow_deferred.integer || r_shadow_shadowmode == R_SHADOW_SHADOWMODE_STENCIL || !vid.support.ext_framebuffer_object || vid.maxdrawbuffers < 2)
            {
                  r_shadow_usingdeferredprepass = false;
                  if (r_shadow_prepass_width)
                        R_Shadow_FreeDeferred();
                  r_shadow_prepass_width = r_shadow_prepass_height = 0;
                  break;
            }

            if (r_shadow_prepass_width != vid.width || r_shadow_prepass_height != vid.height)
            {
                  R_Shadow_FreeDeferred();

                  r_shadow_usingdeferredprepass = true;
                  r_shadow_prepass_width = vid.width;
                  r_shadow_prepass_height = vid.height;
                  r_shadow_prepassgeometrydepthtexture = R_LoadTextureShadowMap2D(r_shadow_texturepool, "prepassgeometrydepthmap", vid.width, vid.height, 24, false);
                  switch (vid.renderpath)
                  {
                  case RENDERPATH_D3D9:
                        r_shadow_prepassgeometrydepthcolortexture = R_LoadTexture2D(r_shadow_texturepool, "prepassgeometrydepthcolormap", vid.width, vid.height, NULL, TEXTYPE_COLORBUFFER, TEXF_RENDERTARGET | TEXF_CLAMP | TEXF_ALPHA | TEXF_FORCENEAREST, -1, NULL);
                        break;
                  default:
                        break;
                  }
                  r_shadow_prepassgeometrynormalmaptexture = R_LoadTexture2D(r_shadow_texturepool, "prepassgeometrynormalmap", vid.width, vid.height, NULL, TEXTYPE_COLORBUFFER, TEXF_RENDERTARGET | TEXF_CLAMP | TEXF_ALPHA | TEXF_FORCENEAREST, -1, NULL);
                  r_shadow_prepasslightingdiffusetexture = R_LoadTexture2D(r_shadow_texturepool, "prepasslightingdiffuse", vid.width, vid.height, NULL, TEXTYPE_COLORBUFFER, TEXF_RENDERTARGET | TEXF_CLAMP | TEXF_ALPHA | TEXF_FORCENEAREST, -1, NULL);
                  r_shadow_prepasslightingspeculartexture = R_LoadTexture2D(r_shadow_texturepool, "prepasslightingspecular", vid.width, vid.height, NULL, TEXTYPE_COLORBUFFER, TEXF_RENDERTARGET | TEXF_CLAMP | TEXF_ALPHA | TEXF_FORCENEAREST, -1, NULL);

                  // set up the geometry pass fbo (depth + normalmap)
                  r_shadow_prepassgeometryfbo = R_Mesh_CreateFramebufferObject(r_shadow_prepassgeometrydepthtexture, r_shadow_prepassgeometrynormalmaptexture, NULL, NULL, NULL);
                  R_Mesh_SetRenderTargets(r_shadow_prepassgeometryfbo, r_shadow_prepassgeometrydepthtexture, r_shadow_prepassgeometrynormalmaptexture, r_shadow_prepassgeometrydepthcolortexture, NULL, NULL);
                  // render depth into one texture and normalmap into the other
                  if (qglDrawBuffersARB)
                  {
                        qglDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);CHECKGLERROR
                        qglReadBuffer(GL_NONE);CHECKGLERROR
                        status = qglCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);CHECKGLERROR
                        if (status != GL_FRAMEBUFFER_COMPLETE_EXT)
                        {
                              Con_Printf("R_PrepareRTLights: glCheckFramebufferStatusEXT returned %i\n", status);
                              Cvar_SetValueQuick(&r_shadow_deferred, 0);
                              r_shadow_usingdeferredprepass = false;
                        }
                  }

                  // set up the lighting pass fbo (diffuse + specular)
                  r_shadow_prepasslightingdiffusespecularfbo = R_Mesh_CreateFramebufferObject(r_shadow_prepassgeometrydepthtexture, r_shadow_prepasslightingdiffusetexture, r_shadow_prepasslightingspeculartexture, NULL, NULL);
                  R_Mesh_SetRenderTargets(r_shadow_prepasslightingdiffusespecularfbo, r_shadow_prepassgeometrydepthtexture, r_shadow_prepasslightingdiffusetexture, r_shadow_prepasslightingspeculartexture, NULL, NULL);
                  // render diffuse into one texture and specular into another,
                  // with depth and normalmap bound as textures,
                  // with depth bound as attachment as well
                  if (qglDrawBuffersARB)
                  {
                        qglDrawBuffersARB(2, r_shadow_prepasslightingdrawbuffers);CHECKGLERROR
                        qglReadBuffer(GL_NONE);CHECKGLERROR
                        status = qglCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);CHECKGLERROR
                        if (status != GL_FRAMEBUFFER_COMPLETE_EXT)
                        {
                              Con_Printf("R_PrepareRTLights: glCheckFramebufferStatusEXT returned %i\n", status);
                              Cvar_SetValueQuick(&r_shadow_deferred, 0);
                              r_shadow_usingdeferredprepass = false;
                        }
                  }

                  // set up the lighting pass fbo (diffuse)
                  r_shadow_prepasslightingdiffusefbo = R_Mesh_CreateFramebufferObject(r_shadow_prepassgeometrydepthtexture, r_shadow_prepasslightingdiffusetexture, NULL, NULL, NULL);
                  R_Mesh_SetRenderTargets(r_shadow_prepasslightingdiffusefbo, r_shadow_prepassgeometrydepthtexture, r_shadow_prepasslightingdiffusetexture, NULL, NULL, NULL);
                  // render diffuse into one texture,
                  // with depth and normalmap bound as textures,
                  // with depth bound as attachment as well
                  if (qglDrawBuffersARB)
                  {
                        qglDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);CHECKGLERROR
                        qglReadBuffer(GL_NONE);CHECKGLERROR
                        status = qglCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);CHECKGLERROR
                        if (status != GL_FRAMEBUFFER_COMPLETE_EXT)
                        {
                              Con_Printf("R_PrepareRTLights: glCheckFramebufferStatusEXT returned %i\n", status);
                              Cvar_SetValueQuick(&r_shadow_deferred, 0);
                              r_shadow_usingdeferredprepass = false;
                        }
                  }
            }
            break;
      case RENDERPATH_GL11:
      case RENDERPATH_GL13:
      case RENDERPATH_GLES1:
            r_shadow_usingdeferredprepass = false;
            break;
      }

      R_Shadow_EnlargeLeafSurfaceTrisBuffer(r_refdef.scene.worldmodel->brush.num_leafs, r_refdef.scene.worldmodel->num_surfaces, r_refdef.scene.worldmodel->brush.shadowmesh ? r_refdef.scene.worldmodel->brush.shadowmesh->numtriangles : r_refdef.scene.worldmodel->surfmesh.num_triangles, r_refdef.scene.worldmodel->surfmesh.num_triangles);

      flag = r_refdef.scene.rtworld ? LIGHTFLAG_REALTIMEMODE : LIGHTFLAG_NORMALMODE;
      if (r_shadow_bouncegrid.integer != 2)
      {
            if (r_shadow_debuglight.integer >= 0)
            {
                  lightindex = r_shadow_debuglight.integer;
                  light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
                  if (light)
                        R_Shadow_PrepareLight(&light->rtlight);
            }
            else
            {
                  range = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray); // checked
                  for (lightindex = 0;lightindex < range;lightindex++)
                  {
                        light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
                        if (light && (light->flags & flag))
                              R_Shadow_PrepareLight(&light->rtlight);
                  }
            }
      }
      if (r_refdef.scene.rtdlight)
      {
            for (lnum = 0;lnum < r_refdef.scene.numlights;lnum++)
                  R_Shadow_PrepareLight(r_refdef.scene.lights[lnum]);
      }
      else if(gl_flashblend.integer)
      {
            for (lnum = 0;lnum < r_refdef.scene.numlights;lnum++)
            {
                  rtlight_t *rtlight = r_refdef.scene.lights[lnum];
                  f = (rtlight->style >= 0 ? r_refdef.scene.lightstylevalue[rtlight->style] : 1) * r_shadow_lightintensityscale.value;
                  VectorScale(rtlight->color, f, rtlight->currentcolor);
            }
      }

      if (r_editlights.integer)
            R_Shadow_DrawLightSprites();
}

void R_Shadow_DrawLights(void)
{
      int flag;
      int lnum;
      size_t lightindex;
      dlight_t *light;
      size_t range;

      R_Shadow_RenderMode_Begin();

      if (r_shadow_bouncegrid.integer != 2)
      {
            flag = r_refdef.scene.rtworld ? LIGHTFLAG_REALTIMEMODE : LIGHTFLAG_NORMALMODE;
            if (r_shadow_debuglight.integer >= 0)
            {
                  lightindex = r_shadow_debuglight.integer;
                  light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
                  if (light)
                        R_Shadow_DrawLight(&light->rtlight);
            }
            else
            {
                  range = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray); // checked
                  for (lightindex = 0;lightindex < range;lightindex++)
                  {
                        light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
                        if (light && (light->flags & flag))
                              R_Shadow_DrawLight(&light->rtlight);
                  }
            }
      }
      if (r_refdef.scene.rtdlight)
            for (lnum = 0;lnum < r_refdef.scene.numlights;lnum++)
                  R_Shadow_DrawLight(r_refdef.scene.lights[lnum]);

      R_Shadow_RenderMode_End();
}

extern const float r_screenvertex3f[12];
extern void R_SetupView(qboolean allowwaterclippingplane);
extern void R_ResetViewRendering3D(void);
extern void R_ResetViewRendering2D(void);
extern cvar_t r_shadows;
extern cvar_t r_shadows_darken;
extern cvar_t r_shadows_drawafterrtlighting;
extern cvar_t r_shadows_castfrombmodels;
extern cvar_t r_shadows_throwdistance;
extern cvar_t r_shadows_throwdirection;
extern cvar_t r_shadows_focus;
extern cvar_t r_shadows_shadowmapscale;

void R_Shadow_PrepareModelShadows(void)
{
      int i;
      float scale, size, radius, dot1, dot2;
      vec3_t shadowdir, shadowforward, shadowright, shadoworigin, shadowfocus, shadowmins, shadowmaxs;
      entity_render_t *ent;

      if (!r_refdef.scene.numentities)
            return;

      switch (r_shadow_shadowmode)
      {
      case R_SHADOW_SHADOWMODE_SHADOWMAP2D:
            if (r_shadows.integer >= 2) 
                  break;
            // fall through
      case R_SHADOW_SHADOWMODE_STENCIL:
            for (i = 0;i < r_refdef.scene.numentities;i++)
            {
                  ent = r_refdef.scene.entities[i];
                  if (!ent->animcache_vertex3f && ent->model && ent->model->DrawShadowVolume != NULL && (!ent->model->brush.submodel || r_shadows_castfrombmodels.integer) && (ent->flags & RENDER_SHADOW))
                        R_AnimCache_GetEntity(ent, false, false);
            }
            return;
      default:
            return;
      }

      size = 2*r_shadow_shadowmapmaxsize;
      scale = r_shadow_shadowmapping_precision.value * r_shadows_shadowmapscale.value;
      radius = 0.5f * size / scale;

      Math_atov(r_shadows_throwdirection.string, shadowdir);
      VectorNormalize(shadowdir);
      dot1 = DotProduct(r_refdef.view.forward, shadowdir);
      dot2 = DotProduct(r_refdef.view.up, shadowdir);
      if (fabs(dot1) <= fabs(dot2))
            VectorMA(r_refdef.view.forward, -dot1, shadowdir, shadowforward);
      else
            VectorMA(r_refdef.view.up, -dot2, shadowdir, shadowforward);
      VectorNormalize(shadowforward);
      CrossProduct(shadowdir, shadowforward, shadowright);
      Math_atov(r_shadows_focus.string, shadowfocus);
      VectorM(shadowfocus[0], r_refdef.view.right, shadoworigin);
      VectorMA(shadoworigin, shadowfocus[1], r_refdef.view.up, shadoworigin);
      VectorMA(shadoworigin, -shadowfocus[2], r_refdef.view.forward, shadoworigin);
      VectorAdd(shadoworigin, r_refdef.view.origin, shadoworigin);
      if (shadowfocus[0] || shadowfocus[1] || shadowfocus[2])
            dot1 = 1;
      VectorMA(shadoworigin, (1.0f - fabs(dot1)) * radius, shadowforward, shadoworigin);

      shadowmins[0] = shadoworigin[0] - r_shadows_throwdistance.value * fabs(shadowdir[0]) - radius * (fabs(shadowforward[0]) + fabs(shadowright[0]));
      shadowmins[1] = shadoworigin[1] - r_shadows_throwdistance.value * fabs(shadowdir[1]) - radius * (fabs(shadowforward[1]) + fabs(shadowright[1]));
      shadowmins[2] = shadoworigin[2] - r_shadows_throwdistance.value * fabs(shadowdir[2]) - radius * (fabs(shadowforward[2]) + fabs(shadowright[2]));
      shadowmaxs[0] = shadoworigin[0] + r_shadows_throwdistance.value * fabs(shadowdir[0]) + radius * (fabs(shadowforward[0]) + fabs(shadowright[0]));
      shadowmaxs[1] = shadoworigin[1] + r_shadows_throwdistance.value * fabs(shadowdir[1]) + radius * (fabs(shadowforward[1]) + fabs(shadowright[1]));
      shadowmaxs[2] = shadoworigin[2] + r_shadows_throwdistance.value * fabs(shadowdir[2]) + radius * (fabs(shadowforward[2]) + fabs(shadowright[2]));

      for (i = 0;i < r_refdef.scene.numentities;i++)
      {
            ent = r_refdef.scene.entities[i];
            if (!BoxesOverlap(ent->mins, ent->maxs, shadowmins, shadowmaxs))
                  continue;
            // cast shadows from anything of the map (submodels are optional)
            if (!ent->animcache_vertex3f && ent->model && ent->model->DrawShadowMap != NULL && (!ent->model->brush.submodel || r_shadows_castfrombmodels.integer) && (ent->flags & RENDER_SHADOW))
                  R_AnimCache_GetEntity(ent, false, false);
      }
}

void R_DrawModelShadowMaps(void)
{
      int i;
      float relativethrowdistance, scale, size, radius, nearclip, farclip, bias, dot1, dot2;
      entity_render_t *ent;
      vec3_t relativelightorigin;
      vec3_t relativelightdirection, relativeforward, relativeright;
      vec3_t relativeshadowmins, relativeshadowmaxs;
      vec3_t shadowdir, shadowforward, shadowright, shadoworigin, shadowfocus;
      float m[12];
      matrix4x4_t shadowmatrix, cameramatrix, mvpmatrix, invmvpmatrix, scalematrix, texmatrix;
      r_viewport_t viewport;
      GLuint fbo = 0;
      float clearcolor[4];

      if (!r_refdef.scene.numentities)
            return;

      switch (r_shadow_shadowmode)
      {
      case R_SHADOW_SHADOWMODE_SHADOWMAP2D:
            break;
      default:
            return;
      }

      R_ResetViewRendering3D();
      R_Shadow_RenderMode_Begin();
      R_Shadow_RenderMode_ActiveLight(NULL);

      switch (r_shadow_shadowmode)
      {
      case R_SHADOW_SHADOWMODE_SHADOWMAP2D:
            if (!r_shadow_shadowmap2dtexture)
                  R_Shadow_MakeShadowMap(0, r_shadow_shadowmapmaxsize);
            fbo = r_shadow_fbo2d;
            r_shadow_shadowmap_texturescale[0] = 1.0f / R_TextureWidth(r_shadow_shadowmap2dtexture);
            r_shadow_shadowmap_texturescale[1] = 1.0f / R_TextureHeight(r_shadow_shadowmap2dtexture);
            r_shadow_rendermode = R_SHADOW_RENDERMODE_SHADOWMAP2D;
            break;
      default:
            break;
      }

      size = 2*r_shadow_shadowmapmaxsize;
      scale = (r_shadow_shadowmapping_precision.value * r_shadows_shadowmapscale.value) / size;
      radius = 0.5f / scale;
      nearclip = -r_shadows_throwdistance.value;
      farclip = r_shadows_throwdistance.value;
      bias = r_shadow_shadowmapping_bias.value * r_shadow_shadowmapping_nearclip.value / (2 * r_shadows_throwdistance.value) * (1024.0f / size);

      r_shadow_shadowmap_parameters[0] = size;
      r_shadow_shadowmap_parameters[1] = size;
      r_shadow_shadowmap_parameters[2] = 1.0;
      r_shadow_shadowmap_parameters[3] = bound(0.0f, 1.0f - r_shadows_darken.value, 1.0f);

      Math_atov(r_shadows_throwdirection.string, shadowdir);
      VectorNormalize(shadowdir);
      Math_atov(r_shadows_focus.string, shadowfocus);
      VectorM(shadowfocus[0], r_refdef.view.right, shadoworigin);
      VectorMA(shadoworigin, shadowfocus[1], r_refdef.view.up, shadoworigin);
      VectorMA(shadoworigin, -shadowfocus[2], r_refdef.view.forward, shadoworigin);
      VectorAdd(shadoworigin, r_refdef.view.origin, shadoworigin);
      dot1 = DotProduct(r_refdef.view.forward, shadowdir);
      dot2 = DotProduct(r_refdef.view.up, shadowdir);
      if (fabs(dot1) <= fabs(dot2)) 
            VectorMA(r_refdef.view.forward, -dot1, shadowdir, shadowforward);
      else
            VectorMA(r_refdef.view.up, -dot2, shadowdir, shadowforward);
      VectorNormalize(shadowforward);
      VectorM(scale, shadowforward, &m[0]);
      if (shadowfocus[0] || shadowfocus[1] || shadowfocus[2])
            dot1 = 1;
      m[3] = fabs(dot1) * 0.5f - DotProduct(shadoworigin, &m[0]);
      CrossProduct(shadowdir, shadowforward, shadowright);
      VectorM(scale, shadowright, &m[4]);
      m[7] = 0.5f - DotProduct(shadoworigin, &m[4]);
      VectorM(1.0f / (farclip - nearclip), shadowdir, &m[8]);
      m[11] = 0.5f - DotProduct(shadoworigin, &m[8]);
      Matrix4x4_FromArray12FloatD3D(&shadowmatrix, m);
      Matrix4x4_Invert_Full(&cameramatrix, &shadowmatrix);
      R_Viewport_InitOrtho(&viewport, &cameramatrix, 0, 0, size, size, 0, 0, 1, 1, 0, -1, NULL); 

      VectorMA(shadoworigin, (1.0f - fabs(dot1)) * radius, shadowforward, shadoworigin);

      R_Mesh_SetRenderTargets(fbo, r_shadow_shadowmap2dtexture, r_shadow_shadowmap2dcolortexture, NULL, NULL, NULL);
      R_SetupShader_DepthOrShadow(true);
      GL_PolygonOffset(r_shadow_shadowmapping_polygonfactor.value, r_shadow_shadowmapping_polygonoffset.value);
      GL_DepthMask(true);
      GL_DepthTest(true);
      R_SetViewport(&viewport);
      GL_Scissor(viewport.x, viewport.y, min(viewport.width + r_shadow_shadowmapborder, 2*r_shadow_shadowmapmaxsize), viewport.height + r_shadow_shadowmapborder);
      Vector4Set(clearcolor, 1,1,1,1);
      // in D3D9 we have to render to a color texture shadowmap
      // in GL we render directly to a depth texture only
      if (r_shadow_shadowmap2dtexture)
            GL_Clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT, clearcolor, 1.0f, 0);
      else
            GL_Clear(GL_DEPTH_BUFFER_BIT, clearcolor, 1.0f, 0);
      // render into a slightly restricted region so that the borders of the
      // shadowmap area fade away, rather than streaking across everything
      // outside the usable area
      GL_Scissor(viewport.x + r_shadow_shadowmapborder, viewport.y + r_shadow_shadowmapborder, viewport.width - 2*r_shadow_shadowmapborder, viewport.height - 2*r_shadow_shadowmapborder);

#if 0
      // debugging
      R_Mesh_SetMainRenderTargets();
      R_SetupShader_ShowDepth(true);
      GL_ColorMask(1,1,1,1);
      GL_Clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT, clearcolor, 1.0f, 0);
#endif

      for (i = 0;i < r_refdef.scene.numentities;i++)
      {
            ent = r_refdef.scene.entities[i];

            // cast shadows from anything of the map (submodels are optional)
            if (ent->model && ent->model->DrawShadowMap != NULL && (!ent->model->brush.submodel || r_shadows_castfrombmodels.integer) && (ent->flags & RENDER_SHADOW))
            {
                  relativethrowdistance = r_shadows_throwdistance.value * Matrix4x4_ScaleFromMatrix(&ent->inversematrix);
                  Matrix4x4_Transform(&ent->inversematrix, shadoworigin, relativelightorigin);
                  Matrix4x4_Transform3x3(&ent->inversematrix, shadowdir, relativelightdirection);
                  Matrix4x4_Transform3x3(&ent->inversematrix, shadowforward, relativeforward);
                  Matrix4x4_Transform3x3(&ent->inversematrix, shadowright, relativeright);
                  relativeshadowmins[0] = relativelightorigin[0] - r_shadows_throwdistance.value * fabs(relativelightdirection[0]) - radius * (fabs(relativeforward[0]) + fabs(relativeright[0]));
                  relativeshadowmins[1] = relativelightorigin[1] - r_shadows_throwdistance.value * fabs(relativelightdirection[1]) - radius * (fabs(relativeforward[1]) + fabs(relativeright[1]));
                  relativeshadowmins[2] = relativelightorigin[2] - r_shadows_throwdistance.value * fabs(relativelightdirection[2]) - radius * (fabs(relativeforward[2]) + fabs(relativeright[2]));
                  relativeshadowmaxs[0] = relativelightorigin[0] + r_shadows_throwdistance.value * fabs(relativelightdirection[0]) + radius * (fabs(relativeforward[0]) + fabs(relativeright[0]));
                  relativeshadowmaxs[1] = relativelightorigin[1] + r_shadows_throwdistance.value * fabs(relativelightdirection[1]) + radius * (fabs(relativeforward[1]) + fabs(relativeright[1]));
                  relativeshadowmaxs[2] = relativelightorigin[2] + r_shadows_throwdistance.value * fabs(relativelightdirection[2]) + radius * (fabs(relativeforward[2]) + fabs(relativeright[2]));
                  RSurf_ActiveModelEntity(ent, false, false, false);
                  ent->model->DrawShadowMap(0, ent, relativelightorigin, relativelightdirection, relativethrowdistance, ent->model->nummodelsurfaces, ent->model->sortedmodelsurfaces, NULL, relativeshadowmins, relativeshadowmaxs);
                  rsurface.entity = NULL; // used only by R_GetCurrentTexture and RSurf_ActiveWorldEntity/RSurf_ActiveModelEntity
            }
      }

#if 0
      if (r_test.integer)
      {
            unsigned char *rawpixels = Z_Malloc(viewport.width*viewport.height*4);
            CHECKGLERROR
            qglReadPixels(viewport.x, viewport.y, viewport.width, viewport.height, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, rawpixels);
            CHECKGLERROR
            Image_WriteTGABGRA("r_shadows_2.tga", viewport.width, viewport.height, rawpixels);
            Cvar_SetValueQuick(&r_test, 0);
            Z_Free(rawpixels);
      }
#endif

      R_Shadow_RenderMode_End();

      Matrix4x4_Concat(&mvpmatrix, &r_refdef.view.viewport.projectmatrix, &r_refdef.view.viewport.viewmatrix);
      Matrix4x4_Invert_Full(&invmvpmatrix, &mvpmatrix);
      Matrix4x4_CreateScale3(&scalematrix, size, -size, 1); 
      Matrix4x4_AdjustOrigin(&scalematrix, 0, size, -0.5f * bias);
      Matrix4x4_Concat(&texmatrix, &scalematrix, &shadowmatrix);
      Matrix4x4_Concat(&r_shadow_shadowmapmatrix, &texmatrix, &invmvpmatrix);

      switch (vid.renderpath)
      {
      case RENDERPATH_GL11:
      case RENDERPATH_GL13:
      case RENDERPATH_GL20:
      case RENDERPATH_SOFT:
      case RENDERPATH_GLES1:
      case RENDERPATH_GLES2:
            break;
      case RENDERPATH_D3D9:
      case RENDERPATH_D3D10:
      case RENDERPATH_D3D11:
#ifdef OPENGL_ORIENTATION
            r_shadow_shadowmapmatrix.m[0][0]    *= -1.0f;
            r_shadow_shadowmapmatrix.m[0][1]    *= -1.0f;
            r_shadow_shadowmapmatrix.m[0][2]    *= -1.0f;
            r_shadow_shadowmapmatrix.m[0][3]    *= -1.0f;
#else
            r_shadow_shadowmapmatrix.m[0][0]    *= -1.0f;
            r_shadow_shadowmapmatrix.m[1][0]    *= -1.0f;
            r_shadow_shadowmapmatrix.m[2][0]    *= -1.0f;
            r_shadow_shadowmapmatrix.m[3][0]    *= -1.0f;
#endif
            break;
      }

      r_shadow_usingshadowmaportho = true;
      switch (r_shadow_shadowmode)
      {
      case R_SHADOW_SHADOWMODE_SHADOWMAP2D:
            r_shadow_usingshadowmap2d = true;
            break;
      default:
            break;
      }
}

void R_DrawModelShadows(void)
{
      int i;
      float relativethrowdistance;
      entity_render_t *ent;
      vec3_t relativelightorigin;
      vec3_t relativelightdirection;
      vec3_t relativeshadowmins, relativeshadowmaxs;
      vec3_t tmp, shadowdir;

      if (!r_refdef.scene.numentities || !vid.stencil || (r_shadow_shadowmode != R_SHADOW_SHADOWMODE_STENCIL && r_shadows.integer != 1))
            return;

      R_ResetViewRendering3D();
      //GL_Scissor(r_refdef.view.viewport.x, r_refdef.view.viewport.y, r_refdef.view.viewport.width, r_refdef.view.viewport.height);
      //GL_Scissor(r_refdef.view.x, vid.height - r_refdef.view.height - r_refdef.view.y, r_refdef.view.width, r_refdef.view.height);
      R_Shadow_RenderMode_Begin();
      R_Shadow_RenderMode_ActiveLight(NULL);
      r_shadow_lightscissor[0] = r_refdef.view.x;
      r_shadow_lightscissor[1] = vid.height - r_refdef.view.y - r_refdef.view.height;
      r_shadow_lightscissor[2] = r_refdef.view.width;
      r_shadow_lightscissor[3] = r_refdef.view.height;
      R_Shadow_RenderMode_StencilShadowVolumes(false);

      // get shadow dir
      if (r_shadows.integer == 2)
      {
            Math_atov(r_shadows_throwdirection.string, shadowdir);
            VectorNormalize(shadowdir);
      }

      R_Shadow_ClearStencil();

      for (i = 0;i < r_refdef.scene.numentities;i++)
      {
            ent = r_refdef.scene.entities[i];

            // cast shadows from anything of the map (submodels are optional)
            if (ent->model && ent->model->DrawShadowVolume != NULL && (!ent->model->brush.submodel || r_shadows_castfrombmodels.integer) && (ent->flags & RENDER_SHADOW))
            {
                  relativethrowdistance = r_shadows_throwdistance.value * Matrix4x4_ScaleFromMatrix(&ent->inversematrix);
                  VectorSet(relativeshadowmins, -relativethrowdistance, -relativethrowdistance, -relativethrowdistance);
                  VectorSet(relativeshadowmaxs, relativethrowdistance, relativethrowdistance, relativethrowdistance);
                  if (r_shadows.integer == 2) // 2: simpler mode, throw shadows always in same direction
                        Matrix4x4_Transform3x3(&ent->inversematrix, shadowdir, relativelightdirection);
                  else
                  {
                        if(ent->entitynumber != 0)
                        {
                              if(ent->entitynumber >= MAX_EDICTS) // csqc entity
                              {
                                    // FIXME handle this
                                    VectorNegate(ent->modellight_lightdir, relativelightdirection);
                              }
                              else
                              {
                                    // networked entity - might be attached in some way (then we should use the parent's light direction, to not tear apart attached entities)
                                    int entnum, entnum2, recursion;
                                    entnum = entnum2 = ent->entitynumber;
                                    for(recursion = 32; recursion > 0; --recursion)
                                    {
                                          entnum2 = cl.entities[entnum].state_current.tagentity;
                                          if(entnum2 >= 1 && entnum2 < cl.num_entities && cl.entities_active[entnum2])
                                                entnum = entnum2;
                                          else
                                                break;
                                    }
                                    if(recursion && recursion != 32) // if we followed a valid non-empty attachment chain
                                    {
                                          VectorNegate(cl.entities[entnum].render.modellight_lightdir, relativelightdirection);
                                          // transform into modelspace of OUR entity
                                          Matrix4x4_Transform3x3(&cl.entities[entnum].render.matrix, relativelightdirection, tmp);
                                          Matrix4x4_Transform3x3(&ent->inversematrix, tmp, relativelightdirection);
                                    }
                                    else
                                          VectorNegate(ent->modellight_lightdir, relativelightdirection);
                              }
                        }
                        else
                              VectorNegate(ent->modellight_lightdir, relativelightdirection);
                  }

                  VectorScale(relativelightdirection, -relativethrowdistance, relativelightorigin);
                  RSurf_ActiveModelEntity(ent, false, false, false);
                  ent->model->DrawShadowVolume(ent, relativelightorigin, relativelightdirection, relativethrowdistance, ent->model->nummodelsurfaces, ent->model->sortedmodelsurfaces, relativeshadowmins, relativeshadowmaxs);
                  rsurface.entity = NULL; // used only by R_GetCurrentTexture and RSurf_ActiveWorldEntity/RSurf_ActiveModelEntity
            }
      }

      // not really the right mode, but this will disable any silly stencil features
      R_Shadow_RenderMode_End();

      // set up ortho view for rendering this pass
      //GL_Scissor(r_refdef.view.x, vid.height - r_refdef.view.height - r_refdef.view.y, r_refdef.view.width, r_refdef.view.height);
      //GL_ColorMask(r_refdef.view.colormask[0], r_refdef.view.colormask[1], r_refdef.view.colormask[2], 1);
      //GL_ScissorTest(true);
      //R_EntityMatrix(&identitymatrix);
      //R_Mesh_ResetTextureState();
      R_ResetViewRendering2D();

      // set up a darkening blend on shadowed areas
      GL_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
      //GL_DepthRange(0, 1);
      //GL_DepthTest(false);
      //GL_DepthMask(false);
      //GL_PolygonOffset(0, 0);CHECKGLERROR
      GL_Color(0, 0, 0, r_shadows_darken.value);
      //GL_ColorMask(r_refdef.view.colormask[0], r_refdef.view.colormask[1], r_refdef.view.colormask[2], 1);
      //GL_DepthFunc(GL_ALWAYS);
      R_SetStencil(true, 255, GL_KEEP, GL_KEEP, GL_KEEP, GL_NOTEQUAL, 128, 255);

      // apply the blend to the shadowed areas
      R_Mesh_PrepareVertices_Generic_Arrays(4, r_screenvertex3f, NULL, NULL);
      R_SetupShader_Generic(NULL, NULL, GL_MODULATE, 1, true);
      R_Mesh_Draw(0, 4, 0, 2, polygonelement3i, NULL, 0, polygonelement3s, NULL, 0);

      // restore the viewport
      R_SetViewport(&r_refdef.view.viewport);

      // restore other state to normal
      //R_Shadow_RenderMode_End();
}

void R_BeginCoronaQuery(rtlight_t *rtlight, float scale, qboolean usequery)
{
      float zdist;
      vec3_t centerorigin;
      float vertex3f[12];
      // if it's too close, skip it
      if (VectorLength(rtlight->currentcolor) < (1.0f / 256.0f))
            return;
      zdist = (DotProduct(rtlight->shadoworigin, r_refdef.view.forward) - DotProduct(r_refdef.view.origin, r_refdef.view.forward));
      if (zdist < 32)
            return;
      if (usequery && r_numqueries + 2 <= r_maxqueries)
      {
            rtlight->corona_queryindex_allpixels = r_queries[r_numqueries++];
            rtlight->corona_queryindex_visiblepixels = r_queries[r_numqueries++];
            // we count potential samples in the middle of the screen, we count actual samples at the light location, this allows counting potential samples of off-screen lights
            VectorMA(r_refdef.view.origin, zdist, r_refdef.view.forward, centerorigin);

            switch(vid.renderpath)
            {
            case RENDERPATH_GL11:
            case RENDERPATH_GL13:
            case RENDERPATH_GL20:
            case RENDERPATH_GLES1:
            case RENDERPATH_GLES2:
                  CHECKGLERROR
                  // NOTE: GL_DEPTH_TEST must be enabled or ATI won't count samples, so use GL_DepthFunc instead
                  qglBeginQueryARB(GL_SAMPLES_PASSED_ARB, rtlight->corona_queryindex_allpixels);
                  GL_DepthFunc(GL_ALWAYS);
                  R_CalcSprite_Vertex3f(vertex3f, centerorigin, r_refdef.view.right, r_refdef.view.up, scale, -scale, -scale, scale);
                  R_Mesh_PrepareVertices_Vertex3f(4, vertex3f, NULL);
                  R_Mesh_Draw(0, 4, 0, 2, polygonelement3i, NULL, 0, polygonelement3s, NULL, 0);
                  qglEndQueryARB(GL_SAMPLES_PASSED_ARB);
                  GL_DepthFunc(GL_LEQUAL);
                  qglBeginQueryARB(GL_SAMPLES_PASSED_ARB, rtlight->corona_queryindex_visiblepixels);
                  R_CalcSprite_Vertex3f(vertex3f, rtlight->shadoworigin, r_refdef.view.right, r_refdef.view.up, scale, -scale, -scale, scale);
                  R_Mesh_PrepareVertices_Vertex3f(4, vertex3f, NULL);
                  R_Mesh_Draw(0, 4, 0, 2, polygonelement3i, NULL, 0, polygonelement3s, NULL, 0);
                  qglEndQueryARB(GL_SAMPLES_PASSED_ARB);
                  CHECKGLERROR
                  break;
            case RENDERPATH_D3D9:
                  Con_DPrintf("FIXME D3D9 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
                  break;
            case RENDERPATH_D3D10:
                  Con_DPrintf("FIXME D3D10 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
                  break;
            case RENDERPATH_D3D11:
                  Con_DPrintf("FIXME D3D11 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
                  break;
            case RENDERPATH_SOFT:
                  //Con_DPrintf("FIXME SOFT %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
                  break;
            }
      }
      rtlight->corona_visibility = bound(0, (zdist - 32) / 32, 1);
}

static float spritetexcoord2f[4*2] = {0, 1, 0, 0, 1, 0, 1, 1};

void R_DrawCorona(rtlight_t *rtlight, float cscale, float scale)
{
      vec3_t color;
      GLint allpixels = 0, visiblepixels = 0;
      // now we have to check the query result
      if (rtlight->corona_queryindex_visiblepixels)
      {
            switch(vid.renderpath)
            {
            case RENDERPATH_GL11:
            case RENDERPATH_GL13:
            case RENDERPATH_GL20:
            case RENDERPATH_GLES1:
            case RENDERPATH_GLES2:
                  CHECKGLERROR
                  qglGetQueryObjectivARB(rtlight->corona_queryindex_visiblepixels, GL_QUERY_RESULT_ARB, &visiblepixels);
                  qglGetQueryObjectivARB(rtlight->corona_queryindex_allpixels, GL_QUERY_RESULT_ARB, &allpixels);
                  CHECKGLERROR
                  break;
            case RENDERPATH_D3D9:
                  Con_DPrintf("FIXME D3D9 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
                  break;
            case RENDERPATH_D3D10:
                  Con_DPrintf("FIXME D3D10 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
                  break;
            case RENDERPATH_D3D11:
                  Con_DPrintf("FIXME D3D11 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
                  break;
            case RENDERPATH_SOFT:
                  //Con_DPrintf("FIXME SOFT %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
                  break;
            }
            //Con_Printf("%i of %i pixels\n", (int)visiblepixels, (int)allpixels);
            if (visiblepixels < 1 || allpixels < 1)
                  return;
            rtlight->corona_visibility *= bound(0, (float)visiblepixels / (float)allpixels, 1);
            cscale *= rtlight->corona_visibility;
      }
      else
      {
            // FIXME: these traces should scan all render entities instead of cl.world
            if (CL_TraceLine(r_refdef.view.origin, rtlight->shadoworigin, MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false, true).fraction < 1)
                  return;
      }
      VectorScale(rtlight->currentcolor, cscale, color);
      if (VectorLength(color) > (1.0f / 256.0f))
      {
            float vertex3f[12];
            qboolean negated = (color[0] + color[1] + color[2] < 0) && vid.support.ext_blend_subtract;
            if(negated)
            {
                  VectorNegate(color, color);
                  GL_BlendEquationSubtract(true);
            }
            R_CalcSprite_Vertex3f(vertex3f, rtlight->shadoworigin, r_refdef.view.right, r_refdef.view.up, scale, -scale, -scale, scale);
            RSurf_ActiveCustomEntity(&identitymatrix, &identitymatrix, RENDER_NODEPTHTEST, 0, color[0], color[1], color[2], 1, 4, vertex3f, spritetexcoord2f, NULL, NULL, NULL, NULL, 2, polygonelement3i, polygonelement3s, false, false);
            R_DrawCustomSurface(r_shadow_lightcorona, &identitymatrix, MATERIALFLAG_ADD | MATERIALFLAG_BLENDED | MATERIALFLAG_FULLBRIGHT | MATERIALFLAG_NOCULLFACE, 0, 4, 0, 2, false, false);
            if(negated)
                  GL_BlendEquationSubtract(false);
      }
}

void R_Shadow_DrawCoronas(void)
{
      int i, flag;
      qboolean usequery = false;
      size_t lightindex;
      dlight_t *light;
      rtlight_t *rtlight;
      size_t range;
      if (r_coronas.value < (1.0f / 256.0f) && !gl_flashblend.integer)
            return;
      if (r_waterstate.renderingscene)
            return;
      flag = r_refdef.scene.rtworld ? LIGHTFLAG_REALTIMEMODE : LIGHTFLAG_NORMALMODE;
      R_EntityMatrix(&identitymatrix);

      range = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray); // checked

      // check occlusion of coronas
      // use GL_ARB_occlusion_query if available
      // otherwise use raytraces
      r_numqueries = 0;
      switch (vid.renderpath)
      {
      case RENDERPATH_GL11:
      case RENDERPATH_GL13:
      case RENDERPATH_GL20:
      case RENDERPATH_GLES1:
      case RENDERPATH_GLES2:
            usequery = vid.support.arb_occlusion_query && r_coronas_occlusionquery.integer;
            if (usequery)
            {
                  GL_ColorMask(0,0,0,0);
                  if (r_maxqueries < (range + r_refdef.scene.numlights) * 2)
                  if (r_maxqueries < MAX_OCCLUSION_QUERIES)
                  {
                        i = r_maxqueries;
                        r_maxqueries = (range + r_refdef.scene.numlights) * 4;
                        r_maxqueries = min(r_maxqueries, MAX_OCCLUSION_QUERIES);
                        CHECKGLERROR
                        qglGenQueriesARB(r_maxqueries - i, r_queries + i);
                        CHECKGLERROR
                  }
                  RSurf_ActiveWorldEntity();
                  GL_BlendFunc(GL_ONE, GL_ZERO);
                  GL_CullFace(GL_NONE);
                  GL_DepthMask(false);
                  GL_DepthRange(0, 1);
                  GL_PolygonOffset(0, 0);
                  GL_DepthTest(true);
                  R_Mesh_ResetTextureState();
                  R_SetupShader_Generic(NULL, NULL, GL_MODULATE, 1, false);
            }
            break;
      case RENDERPATH_D3D9:
            usequery = false;
            //Con_DPrintf("FIXME D3D9 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
            break;
      case RENDERPATH_D3D10:
            Con_DPrintf("FIXME D3D10 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
            break;
      case RENDERPATH_D3D11:
            Con_DPrintf("FIXME D3D11 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
            break;
      case RENDERPATH_SOFT:
            usequery = false;
            //Con_DPrintf("FIXME SOFT %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
            break;
      }
      for (lightindex = 0;lightindex < range;lightindex++)
      {
            light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
            if (!light)
                  continue;
            rtlight = &light->rtlight;
            rtlight->corona_visibility = 0;
            rtlight->corona_queryindex_visiblepixels = 0;
            rtlight->corona_queryindex_allpixels = 0;
            if (!(rtlight->flags & flag))
                  continue;
            if (rtlight->corona <= 0)
                  continue;
            if (r_shadow_debuglight.integer >= 0 && r_shadow_debuglight.integer != (int)lightindex)
                  continue;
            R_BeginCoronaQuery(rtlight, rtlight->radius * rtlight->coronasizescale * r_coronas_occlusionsizescale.value, usequery);
      }
      for (i = 0;i < r_refdef.scene.numlights;i++)
      {
            rtlight = r_refdef.scene.lights[i];
            rtlight->corona_visibility = 0;
            rtlight->corona_queryindex_visiblepixels = 0;
            rtlight->corona_queryindex_allpixels = 0;
            if (!(rtlight->flags & flag))
                  continue;
            if (rtlight->corona <= 0)
                  continue;
            R_BeginCoronaQuery(rtlight, rtlight->radius * rtlight->coronasizescale * r_coronas_occlusionsizescale.value, usequery);
      }
      if (usequery)
            GL_ColorMask(r_refdef.view.colormask[0], r_refdef.view.colormask[1], r_refdef.view.colormask[2], 1);

      // now draw the coronas using the query data for intensity info
      for (lightindex = 0;lightindex < range;lightindex++)
      {
            light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
            if (!light)
                  continue;
            rtlight = &light->rtlight;
            if (rtlight->corona_visibility <= 0)
                  continue;
            R_DrawCorona(rtlight, rtlight->corona * r_coronas.value * 0.25f, rtlight->radius * rtlight->coronasizescale);
      }
      for (i = 0;i < r_refdef.scene.numlights;i++)
      {
            rtlight = r_refdef.scene.lights[i];
            if (rtlight->corona_visibility <= 0)
                  continue;
            if (gl_flashblend.integer)
                  R_DrawCorona(rtlight, rtlight->corona, rtlight->radius * rtlight->coronasizescale * 2.0f);
            else
                  R_DrawCorona(rtlight, rtlight->corona * r_coronas.value * 0.25f, rtlight->radius * rtlight->coronasizescale);
      }
}



dlight_t *R_Shadow_NewWorldLight(void)
{
      return (dlight_t *)Mem_ExpandableArray_AllocRecord(&r_shadow_worldlightsarray);
}

void R_Shadow_UpdateWorldLight(dlight_t *light, vec3_t origin, vec3_t angles, vec3_t color, vec_t radius, vec_t corona, int style, int shadowenable, const char *cubemapname, vec_t coronasizescale, vec_t ambientscale, vec_t diffusescale, vec_t specularscale, int flags)
{
      matrix4x4_t matrix;
      // validate parameters
      if (style < 0 || style >= MAX_LIGHTSTYLES)
      {
            Con_Printf("R_Shadow_NewWorldLight: invalid light style number %i, must be >= 0 and < %i\n", light->style, MAX_LIGHTSTYLES);
            style = 0;
      }
      if (!cubemapname)
            cubemapname = "";

      // copy to light properties
      VectorCopy(origin, light->origin);
      light->angles[0] = angles[0] - 360 * floor(angles[0] / 360);
      light->angles[1] = angles[1] - 360 * floor(angles[1] / 360);
      light->angles[2] = angles[2] - 360 * floor(angles[2] / 360);
      /*
      light->color[0] = max(color[0], 0);
      light->color[1] = max(color[1], 0);
      light->color[2] = max(color[2], 0);
      */
      light->color[0] = color[0];
      light->color[1] = color[1];
      light->color[2] = color[2];
      light->radius = max(radius, 0);
      light->style = style;
      light->shadow = shadowenable;
      light->corona = corona;
      strlcpy(light->cubemapname, cubemapname, sizeof(light->cubemapname));
      light->coronasizescale = coronasizescale;
      light->ambientscale = ambientscale;
      light->diffusescale = diffusescale;
      light->specularscale = specularscale;
      light->flags = flags;

      // update renderable light data
      Matrix4x4_CreateFromQuakeEntity(&matrix, light->origin[0], light->origin[1], light->origin[2], light->angles[0], light->angles[1], light->angles[2], light->radius);
      R_RTLight_Update(&light->rtlight, true, &matrix, light->color, light->style, light->cubemapname[0] ? light->cubemapname : NULL, light->shadow, light->corona, light->coronasizescale, light->ambientscale, light->diffusescale, light->specularscale, light->flags);
}

void R_Shadow_FreeWorldLight(dlight_t *light)
{
      if (r_shadow_selectedlight == light)
            r_shadow_selectedlight = NULL;
      R_RTLight_Uncompile(&light->rtlight);
      Mem_ExpandableArray_FreeRecord(&r_shadow_worldlightsarray, light);
}

void R_Shadow_ClearWorldLights(void)
{
      size_t lightindex;
      dlight_t *light;
      size_t range = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray); // checked
      for (lightindex = 0;lightindex < range;lightindex++)
      {
            light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
            if (light)
                  R_Shadow_FreeWorldLight(light);
      }
      r_shadow_selectedlight = NULL;
}

void R_Shadow_SelectLight(dlight_t *light)
{
      if (r_shadow_selectedlight)
            r_shadow_selectedlight->selected = false;
      r_shadow_selectedlight = light;
      if (r_shadow_selectedlight)
            r_shadow_selectedlight->selected = true;
}

void R_Shadow_DrawCursor_TransparentCallback(const entity_render_t *ent, const rtlight_t *rtlight, int numsurfaces, int *surfacelist)
{
      // this is never batched (there can be only one)
      float vertex3f[12];
      R_CalcSprite_Vertex3f(vertex3f, r_editlights_cursorlocation, r_refdef.view.right, r_refdef.view.up, EDLIGHTSPRSIZE, -EDLIGHTSPRSIZE, -EDLIGHTSPRSIZE, EDLIGHTSPRSIZE);
      RSurf_ActiveCustomEntity(&identitymatrix, &identitymatrix, 0, 0, 1, 1, 1, 1, 4, vertex3f, spritetexcoord2f, NULL, NULL, NULL, NULL, 2, polygonelement3i, polygonelement3s, false, false);
      R_DrawCustomSurface(r_editlights_sprcursor, &identitymatrix, MATERIALFLAG_NODEPTHTEST | MATERIALFLAG_ALPHA | MATERIALFLAG_BLENDED | MATERIALFLAG_FULLBRIGHT | MATERIALFLAG_NOCULLFACE, 0, 4, 0, 2, false, false);
}

void R_Shadow_DrawLightSprite_TransparentCallback(const entity_render_t *ent, const rtlight_t *rtlight, int numsurfaces, int *surfacelist)
{
      float intensity;
      float s;
      vec3_t spritecolor;
      skinframe_t *skinframe;
      float vertex3f[12];

      // this is never batched (due to the ent parameter changing every time)
      // so numsurfaces == 1 and surfacelist[0] == lightnumber
      const dlight_t *light = (dlight_t *)ent;
      s = EDLIGHTSPRSIZE;

      R_CalcSprite_Vertex3f(vertex3f, light->origin, r_refdef.view.right, r_refdef.view.up, s, -s, -s, s);

      intensity = 0.5f;
      VectorScale(light->color, intensity, spritecolor);
      if (VectorLength(spritecolor) < 0.1732f)
            VectorSet(spritecolor, 0.1f, 0.1f, 0.1f);
      if (VectorLength(spritecolor) > 1.0f)
            VectorNormalize(spritecolor);

      // draw light sprite
      if (light->cubemapname[0] && !light->shadow)
            skinframe = r_editlights_sprcubemapnoshadowlight;
      else if (light->cubemapname[0])
            skinframe = r_editlights_sprcubemaplight;
      else if (!light->shadow)
            skinframe = r_editlights_sprnoshadowlight;
      else
            skinframe = r_editlights_sprlight;

      RSurf_ActiveCustomEntity(&identitymatrix, &identitymatrix, 0, 0, spritecolor[0], spritecolor[1], spritecolor[2], 1, 4, vertex3f, spritetexcoord2f, NULL, NULL, NULL, NULL, 2, polygonelement3i, polygonelement3s, false, false);
      R_DrawCustomSurface(skinframe, &identitymatrix, MATERIALFLAG_ALPHA | MATERIALFLAG_BLENDED | MATERIALFLAG_FULLBRIGHT | MATERIALFLAG_NOCULLFACE, 0, 4, 0, 2, false, false);

      // draw selection sprite if light is selected
      if (light->selected)
      {
            RSurf_ActiveCustomEntity(&identitymatrix, &identitymatrix, 0, 0, 1, 1, 1, 1, 4, vertex3f, spritetexcoord2f, NULL, NULL, NULL, NULL, 2, polygonelement3i, polygonelement3s, false, false);
            R_DrawCustomSurface(r_editlights_sprselection, &identitymatrix, MATERIALFLAG_ALPHA | MATERIALFLAG_BLENDED | MATERIALFLAG_FULLBRIGHT | MATERIALFLAG_NOCULLFACE, 0, 4, 0, 2, false, false);
            // VorteX todo: add normalmode/realtime mode light overlay sprites?
      }
}

void R_Shadow_DrawLightSprites(void)
{
      size_t lightindex;
      dlight_t *light;
      size_t range = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray); // checked
      for (lightindex = 0;lightindex < range;lightindex++)
      {
            light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
            if (light)
                  R_MeshQueue_AddTransparent(light->origin, R_Shadow_DrawLightSprite_TransparentCallback, (entity_render_t *)light, 5, &light->rtlight);
      }
      if (!r_editlights_lockcursor)
            R_MeshQueue_AddTransparent(r_editlights_cursorlocation, R_Shadow_DrawCursor_TransparentCallback, NULL, 0, NULL);
}

int R_Shadow_GetRTLightInfo(unsigned int lightindex, float *origin, float *radius, float *color)
{
      unsigned int range;
      dlight_t *light;
      rtlight_t *rtlight;
      range = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray);
      if (lightindex >= range)
            return -1;
      light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
      if (!light)
            return 0;
      rtlight = &light->rtlight;
      //if (!(rtlight->flags & flag))
      //    return 0;
      VectorCopy(rtlight->shadoworigin, origin);
      *radius = rtlight->radius;
      VectorCopy(rtlight->color, color);
      return 1;
}

void R_Shadow_SelectLightInView(void)
{
      float bestrating, rating, temp[3];
      dlight_t *best;
      size_t lightindex;
      dlight_t *light;
      size_t range = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray); // checked
      best = NULL;
      bestrating = 0;

      if (r_editlights_lockcursor)
            return;
      for (lightindex = 0;lightindex < range;lightindex++)
      {
            light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
            if (!light)
                  continue;
            VectorSubtract(light->origin, r_refdef.view.origin, temp);
            rating = (DotProduct(temp, r_refdef.view.forward) / sqrt(DotProduct(temp, temp)));
            if (rating >= 0.95)
            {
                  rating /= (1 + 0.0625f * sqrt(DotProduct(temp, temp)));
                  if (bestrating < rating && CL_TraceLine(light->origin, r_refdef.view.origin, MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false, true).fraction == 1.0f)
                  {
                        bestrating = rating;
                        best = light;
                  }
            }
      }
      R_Shadow_SelectLight(best);
}

void R_Shadow_LoadWorldLights(void)
{
      int n, a, style, shadow, flags;
      char tempchar, *lightsstring, *s, *t, name[MAX_QPATH], cubemapname[MAX_QPATH];
      float origin[3], radius, color[3], angles[3], corona, coronasizescale, ambientscale, diffusescale, specularscale;
      if (cl.worldmodel == NULL)
      {
            Con_Print("No map loaded.\n");
            return;
      }
      dpsnprintf(name, sizeof(name), "%s.rtlights", cl.worldnamenoextension);
      lightsstring = (char *)FS_LoadFile(name, tempmempool, false, NULL);
      if (lightsstring)
      {
            s = lightsstring;
            n = 0;
            while (*s)
            {
                  t = s;
                  /*
                  shadow = true;
                  for (;COM_Parse(t, true) && strcmp(
                  if (COM_Parse(t, true))
                  {
                        if (com_token[0] == '!')
                        {
                              shadow = false;
                              origin[0] = atof(com_token+1);
                        }
                        else
                              origin[0] = atof(com_token);
                        if (Com_Parse(t
                  }
                  */
                  t = s;
                  while (*s && *s != '\n' && *s != '\r')
                        s++;
                  if (!*s)
                        break;
                  tempchar = *s;
                  shadow = true;
                  // check for modifier flags
                  if (*t == '!')
                  {
                        shadow = false;
                        t++;
                  }
                  *s = 0;
#if _MSC_VER >= 1400
#define sscanf sscanf_s
#endif
                  cubemapname[sizeof(cubemapname)-1] = 0;
#if MAX_QPATH != 128
#error update this code if MAX_QPATH changes
#endif
                  a = sscanf(t, "%f %f %f %f %f %f %f %d %127s %f %f %f %f %f %f %f %f %i", &origin[0], &origin[1], &origin[2], &radius, &color[0], &color[1], &color[2], &style, cubemapname
#if _MSC_VER >= 1400
, sizeof(cubemapname)
#endif
, &corona, &angles[0], &angles[1], &angles[2], &coronasizescale, &ambientscale, &diffusescale, &specularscale, &flags);
                  *s = tempchar;
                  if (a < 18)
                        flags = LIGHTFLAG_REALTIMEMODE;
                  if (a < 17)
                        specularscale = 1;
                  if (a < 16)
                        diffusescale = 1;
                  if (a < 15)
                        ambientscale = 0;
                  if (a < 14)
                        coronasizescale = 0.25f;
                  if (a < 13)
                        VectorClear(angles);
                  if (a < 10)
                        corona = 0;
                  if (a < 9 || !strcmp(cubemapname, "\"\""))
                        cubemapname[0] = 0;
                  // remove quotes on cubemapname
                  if (cubemapname[0] == '"' && cubemapname[strlen(cubemapname) - 1] == '"')
                  {
                        size_t namelen;
                        namelen = strlen(cubemapname) - 2;
                        memmove(cubemapname, cubemapname + 1, namelen);
                        cubemapname[namelen] = '\0';
                  }
                  if (a < 8)
                  {
                        Con_Printf("found %d parameters on line %i, should be 8 or more parameters (origin[0] origin[1] origin[2] radius color[0] color[1] color[2] style \"cubemapname\" corona angles[0] angles[1] angles[2] coronasizescale ambientscale diffusescale specularscale flags)\n", a, n + 1);
                        break;
                  }
                  R_Shadow_UpdateWorldLight(R_Shadow_NewWorldLight(), origin, angles, color, radius, corona, style, shadow, cubemapname, coronasizescale, ambientscale, diffusescale, specularscale, flags);
                  if (*s == '\r')
                        s++;
                  if (*s == '\n')
                        s++;
                  n++;
            }
            if (*s)
                  Con_Printf("invalid rtlights file \"%s\"\n", name);
            Mem_Free(lightsstring);
      }
}

void R_Shadow_SaveWorldLights(void)
{
      size_t lightindex;
      dlight_t *light;
      size_t bufchars, bufmaxchars;
      char *buf, *oldbuf;
      char name[MAX_QPATH];
      char line[MAX_INPUTLINE];
      size_t range = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray); // checked, assuming the dpsnprintf mess doesn't screw it up...
      // I hate lines which are 3 times my screen size :( --blub
      if (!range)
            return;
      if (cl.worldmodel == NULL)
      {
            Con_Print("No map loaded.\n");
            return;
      }
      dpsnprintf(name, sizeof(name), "%s.rtlights", cl.worldnamenoextension);
      bufchars = bufmaxchars = 0;
      buf = NULL;
      for (lightindex = 0;lightindex < range;lightindex++)
      {
            light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
            if (!light)
                  continue;
            if (light->coronasizescale != 0.25f || light->ambientscale != 0 || light->diffusescale != 1 || light->specularscale != 1 || light->flags != LIGHTFLAG_REALTIMEMODE)
                  dpsnprintf(line, sizeof(line), "%s%f %f %f %f %f %f %f %d \"%s\" %f %f %f %f %f %f %f %f %i\n", light->shadow ? "" : "!", light->origin[0], light->origin[1], light->origin[2], light->radius, light->color[0], light->color[1], light->color[2], light->style, light->cubemapname, light->corona, light->angles[0], light->angles[1], light->angles[2], light->coronasizescale, light->ambientscale, light->diffusescale, light->specularscale, light->flags);
            else if (light->cubemapname[0] || light->corona || light->angles[0] || light->angles[1] || light->angles[2])
                  dpsnprintf(line, sizeof(line), "%s%f %f %f %f %f %f %f %d \"%s\" %f %f %f %f\n", light->shadow ? "" : "!", light->origin[0], light->origin[1], light->origin[2], light->radius, light->color[0], light->color[1], light->color[2], light->style, light->cubemapname, light->corona, light->angles[0], light->angles[1], light->angles[2]);
            else
                  dpsnprintf(line, sizeof(line), "%s%f %f %f %f %f %f %f %d\n", light->shadow ? "" : "!", light->origin[0], light->origin[1], light->origin[2], light->radius, light->color[0], light->color[1], light->color[2], light->style);
            if (bufchars + strlen(line) > bufmaxchars)
            {
                  bufmaxchars = bufchars + strlen(line) + 2048;
                  oldbuf = buf;
                  buf = (char *)Mem_Alloc(tempmempool, bufmaxchars);
                  if (oldbuf)
                  {
                        if (bufchars)
                              memcpy(buf, oldbuf, bufchars);
                        Mem_Free(oldbuf);
                  }
            }
            if (strlen(line))
            {
                  memcpy(buf + bufchars, line, strlen(line));
                  bufchars += strlen(line);
            }
      }
      if (bufchars)
            FS_WriteFile(name, buf, (fs_offset_t)bufchars);
      if (buf)
            Mem_Free(buf);
}

void R_Shadow_LoadLightsFile(void)
{
      int n, a, style;
      char tempchar, *lightsstring, *s, *t, name[MAX_QPATH];
      float origin[3], radius, color[3], subtract, spotdir[3], spotcone, falloff, distbias;
      if (cl.worldmodel == NULL)
      {
            Con_Print("No map loaded.\n");
            return;
      }
      dpsnprintf(name, sizeof(name), "%s.lights", cl.worldnamenoextension);
      lightsstring = (char *)FS_LoadFile(name, tempmempool, false, NULL);
      if (lightsstring)
      {
            s = lightsstring;
            n = 0;
            while (*s)
            {
                  t = s;
                  while (*s && *s != '\n' && *s != '\r')
                        s++;
                  if (!*s)
                        break;
                  tempchar = *s;
                  *s = 0;
                  a = sscanf(t, "%f %f %f %f %f %f %f %f %f %f %f %f %f %d", &origin[0], &origin[1], &origin[2], &falloff, &color[0], &color[1], &color[2], &subtract, &spotdir[0], &spotdir[1], &spotdir[2], &spotcone, &distbias, &style);
                  *s = tempchar;
                  if (a < 14)
                  {
                        Con_Printf("invalid lights file, found %d parameters on line %i, should be 14 parameters (origin[0] origin[1] origin[2] falloff light[0] light[1] light[2] subtract spotdir[0] spotdir[1] spotdir[2] spotcone distancebias style)\n", a, n + 1);
                        break;
                  }
                  radius = sqrt(DotProduct(color, color) / (falloff * falloff * 8192.0f * 8192.0f));
                  radius = bound(15, radius, 4096);
                  VectorScale(color, (2.0f / (8388608.0f)), color);
                  R_Shadow_UpdateWorldLight(R_Shadow_NewWorldLight(), origin, vec3_origin, color, radius, 0, style, true, NULL, 0.25, 0, 1, 1, LIGHTFLAG_REALTIMEMODE);
                  if (*s == '\r')
                        s++;
                  if (*s == '\n')
                        s++;
                  n++;
            }
            if (*s)
                  Con_Printf("invalid lights file \"%s\"\n", name);
            Mem_Free(lightsstring);
      }
}

// tyrlite/hmap2 light types in the delay field
typedef enum lighttype_e {LIGHTTYPE_MINUSX, LIGHTTYPE_RECIPX, LIGHTTYPE_RECIPXX, LIGHTTYPE_NONE, LIGHTTYPE_SUN, LIGHTTYPE_MINUSXX} lighttype_t;

void R_Shadow_LoadWorldLightsFromMap_LightArghliteTyrlite(void)
{
      int entnum;
      int style;
      int islight;
      int skin;
      int pflags;
      //int effects;
      int type;
      int n;
      char *entfiledata;
      const char *data;
      float origin[3], angles[3], radius, color[3], light[4], fadescale, lightscale, originhack[3], overridecolor[3], vec[4];
      char key[256], value[MAX_INPUTLINE];

      if (cl.worldmodel == NULL)
      {
            Con_Print("No map loaded.\n");
            return;
      }
      // try to load a .ent file first
      dpsnprintf(key, sizeof(key), "%s.ent", cl.worldnamenoextension);
      data = entfiledata = (char *)FS_LoadFile(key, tempmempool, true, NULL);
      // and if that is not found, fall back to the bsp file entity string
      if (!data)
            data = cl.worldmodel->brush.entities;
      if (!data)
            return;
      for (entnum = 0;COM_ParseToken_Simple(&data, false, false) && com_token[0] == '{';entnum++)
      {
            type = LIGHTTYPE_MINUSX;
            origin[0] = origin[1] = origin[2] = 0;
            originhack[0] = originhack[1] = originhack[2] = 0;
            angles[0] = angles[1] = angles[2] = 0;
            color[0] = color[1] = color[2] = 1;
            light[0] = light[1] = light[2] = 1;light[3] = 300;
            overridecolor[0] = overridecolor[1] = overridecolor[2] = 1;
            fadescale = 1;
            lightscale = 1;
            style = 0;
            skin = 0;
            pflags = 0;
            //effects = 0;
            islight = false;
            while (1)
            {
                  if (!COM_ParseToken_Simple(&data, false, false))
                        break; // error
                  if (com_token[0] == '}')
                        break; // end of entity
                  if (com_token[0] == '_')
                        strlcpy(key, com_token + 1, sizeof(key));
                  else
                        strlcpy(key, com_token, sizeof(key));
                  while (key[strlen(key)-1] == ' ') // remove trailing spaces
                        key[strlen(key)-1] = 0;
                  if (!COM_ParseToken_Simple(&data, false, false))
                        break; // error
                  strlcpy(value, com_token, sizeof(value));

                  // now that we have the key pair worked out...
                  if (!strcmp("light", key))
                  {
                        n = sscanf(value, "%f %f %f %f", &vec[0], &vec[1], &vec[2], &vec[3]);
                        if (n == 1)
                        {
                              // quake
                              light[0] = vec[0] * (1.0f / 256.0f);
                              light[1] = vec[0] * (1.0f / 256.0f);
                              light[2] = vec[0] * (1.0f / 256.0f);
                              light[3] = vec[0];
                        }
                        else if (n == 4)
                        {
                              // halflife
                              light[0] = vec[0] * (1.0f / 255.0f);
                              light[1] = vec[1] * (1.0f / 255.0f);
                              light[2] = vec[2] * (1.0f / 255.0f);
                              light[3] = vec[3];
                        }
                  }
                  else if (!strcmp("delay", key))
                        type = atoi(value);
                  else if (!strcmp("origin", key))
                        sscanf(value, "%f %f %f", &origin[0], &origin[1], &origin[2]);
                  else if (!strcmp("angle", key))
                        angles[0] = 0, angles[1] = atof(value), angles[2] = 0;
                  else if (!strcmp("angles", key))
                        sscanf(value, "%f %f %f", &angles[0], &angles[1], &angles[2]);
                  else if (!strcmp("color", key))
                        sscanf(value, "%f %f %f", &color[0], &color[1], &color[2]);
                  else if (!strcmp("wait", key))
                        fadescale = atof(value);
                  else if (!strcmp("classname", key))
                  {
                        if (!strncmp(value, "light", 5))
                        {
                              islight = true;
                              if (!strcmp(value, "light_fluoro"))
                              {
                                    originhack[0] = 0;
                                    originhack[1] = 0;
                                    originhack[2] = 0;
                                    overridecolor[0] = 1;
                                    overridecolor[1] = 1;
                                    overridecolor[2] = 1;
                              }
                              if (!strcmp(value, "light_fluorospark"))
                              {
                                    originhack[0] = 0;
                                    originhack[1] = 0;
                                    originhack[2] = 0;
                                    overridecolor[0] = 1;
                                    overridecolor[1] = 1;
                                    overridecolor[2] = 1;
                              }
                              if (!strcmp(value, "light_globe"))
                              {
                                    originhack[0] = 0;
                                    originhack[1] = 0;
                                    originhack[2] = 0;
                                    overridecolor[0] = 1;
                                    overridecolor[1] = 0.8;
                                    overridecolor[2] = 0.4;
                              }
                              if (!strcmp(value, "light_flame_large_yellow"))
                              {
                                    originhack[0] = 0;
                                    originhack[1] = 0;
                                    originhack[2] = 0;
                                    overridecolor[0] = 1;
                                    overridecolor[1] = 0.5;
                                    overridecolor[2] = 0.1;
                              }
                              if (!strcmp(value, "light_flame_small_yellow"))
                              {
                                    originhack[0] = 0;
                                    originhack[1] = 0;
                                    originhack[2] = 0;
                                    overridecolor[0] = 1;
                                    overridecolor[1] = 0.5;
                                    overridecolor[2] = 0.1;
                              }
                              if (!strcmp(value, "light_torch_small_white"))
                              {
                                    originhack[0] = 0;
                                    originhack[1] = 0;
                                    originhack[2] = 0;
                                    overridecolor[0] = 1;
                                    overridecolor[1] = 0.5;
                                    overridecolor[2] = 0.1;
                              }
                              if (!strcmp(value, "light_torch_small_walltorch"))
                              {
                                    originhack[0] = 0;
                                    originhack[1] = 0;
                                    originhack[2] = 0;
                                    overridecolor[0] = 1;
                                    overridecolor[1] = 0.5;
                                    overridecolor[2] = 0.1;
                              }
                        }
                  }
                  else if (!strcmp("style", key))
                        style = atoi(value);
                  else if (!strcmp("skin", key))
                        skin = (int)atof(value);
                  else if (!strcmp("pflags", key))
                        pflags = (int)atof(value);
                  //else if (!strcmp("effects", key))
                  //    effects = (int)atof(value);
                  else if (cl.worldmodel->type == mod_brushq3)
                  {
                        if (!strcmp("scale", key))
                              lightscale = atof(value);
                        if (!strcmp("fade", key))
                              fadescale = atof(value);
                  }
            }
            if (!islight)
                  continue;
            if (lightscale <= 0)
                  lightscale = 1;
            if (fadescale <= 0)
                  fadescale = 1;
            if (color[0] == color[1] && color[0] == color[2])
            {
                  color[0] *= overridecolor[0];
                  color[1] *= overridecolor[1];
                  color[2] *= overridecolor[2];
            }
            radius = light[3] * r_editlights_quakelightsizescale.value * lightscale / fadescale;
            color[0] = color[0] * light[0];
            color[1] = color[1] * light[1];
            color[2] = color[2] * light[2];
            switch (type)
            {
            case LIGHTTYPE_MINUSX:
                  break;
            case LIGHTTYPE_RECIPX:
                  radius *= 2;
                  VectorScale(color, (1.0f / 16.0f), color);
                  break;
            case LIGHTTYPE_RECIPXX:
                  radius *= 2;
                  VectorScale(color, (1.0f / 16.0f), color);
                  break;
            default:
            case LIGHTTYPE_NONE:
                  break;
            case LIGHTTYPE_SUN:
                  break;
            case LIGHTTYPE_MINUSXX:
                  break;
            }
            VectorAdd(origin, originhack, origin);
            if (radius >= 1)
                  R_Shadow_UpdateWorldLight(R_Shadow_NewWorldLight(), origin, angles, color, radius, (pflags & PFLAGS_CORONA) != 0, style, (pflags & PFLAGS_NOSHADOW) == 0, skin >= 16 ? va("cubemaps/%i", skin) : NULL, 0.25, 0, 1, 1, LIGHTFLAG_REALTIMEMODE);
      }
      if (entfiledata)
            Mem_Free(entfiledata);
}


void R_Shadow_SetCursorLocationForView(void)
{
      vec_t dist, push;
      vec3_t dest, endpos;
      trace_t trace;
      VectorMA(r_refdef.view.origin, r_editlights_cursordistance.value, r_refdef.view.forward, dest);
      trace = CL_TraceLine(r_refdef.view.origin, dest, MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false, true);
      if (trace.fraction < 1)
      {
            dist = trace.fraction * r_editlights_cursordistance.value;
            push = r_editlights_cursorpushback.value;
            if (push > dist)
                  push = dist;
            push = -push;
            VectorMA(trace.endpos, push, r_refdef.view.forward, endpos);
            VectorMA(endpos, r_editlights_cursorpushoff.value, trace.plane.normal, endpos);
      }
      else
      {
            VectorClear( endpos );
      }
      r_editlights_cursorlocation[0] = floor(endpos[0] / r_editlights_cursorgrid.value + 0.5f) * r_editlights_cursorgrid.value;
      r_editlights_cursorlocation[1] = floor(endpos[1] / r_editlights_cursorgrid.value + 0.5f) * r_editlights_cursorgrid.value;
      r_editlights_cursorlocation[2] = floor(endpos[2] / r_editlights_cursorgrid.value + 0.5f) * r_editlights_cursorgrid.value;
}

void R_Shadow_UpdateWorldLightSelection(void)
{
      if (r_editlights.integer)
      {
            R_Shadow_SetCursorLocationForView();
            R_Shadow_SelectLightInView();
      }
      else
            R_Shadow_SelectLight(NULL);
}

void R_Shadow_EditLights_Clear_f(void)
{
      R_Shadow_ClearWorldLights();
}

void R_Shadow_EditLights_Reload_f(void)
{
      if (!cl.worldmodel)
            return;
      strlcpy(r_shadow_mapname, cl.worldname, sizeof(r_shadow_mapname));
      R_Shadow_ClearWorldLights();
      R_Shadow_LoadWorldLights();
      if (!Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray))
      {
            R_Shadow_LoadLightsFile();
            if (!Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray))
                  R_Shadow_LoadWorldLightsFromMap_LightArghliteTyrlite();
      }
}

void R_Shadow_EditLights_Save_f(void)
{
      if (!cl.worldmodel)
            return;
      R_Shadow_SaveWorldLights();
}

void R_Shadow_EditLights_ImportLightEntitiesFromMap_f(void)
{
      R_Shadow_ClearWorldLights();
      R_Shadow_LoadWorldLightsFromMap_LightArghliteTyrlite();
}

void R_Shadow_EditLights_ImportLightsFile_f(void)
{
      R_Shadow_ClearWorldLights();
      R_Shadow_LoadLightsFile();
}

void R_Shadow_EditLights_Spawn_f(void)
{
      vec3_t color;
      if (!r_editlights.integer)
      {
            Con_Print("Cannot spawn light when not in editing mode.  Set r_editlights to 1.\n");
            return;
      }
      if (Cmd_Argc() != 1)
      {
            Con_Print("r_editlights_spawn does not take parameters\n");
            return;
      }
      color[0] = color[1] = color[2] = 1;
      R_Shadow_UpdateWorldLight(R_Shadow_NewWorldLight(), r_editlights_cursorlocation, vec3_origin, color, 200, 0, 0, true, NULL, 0.25, 0, 1, 1, LIGHTFLAG_REALTIMEMODE);
}

void R_Shadow_EditLights_Edit_f(void)
{
      vec3_t origin, angles, color;
      vec_t radius, corona, coronasizescale, ambientscale, diffusescale, specularscale;
      int style, shadows, flags, normalmode, realtimemode;
      char cubemapname[MAX_INPUTLINE];
      if (!r_editlights.integer)
      {
            Con_Print("Cannot spawn light when not in editing mode.  Set r_editlights to 1.\n");
            return;
      }
      if (!r_shadow_selectedlight)
      {
            Con_Print("No selected light.\n");
            return;
      }
      VectorCopy(r_shadow_selectedlight->origin, origin);
      VectorCopy(r_shadow_selectedlight->angles, angles);
      VectorCopy(r_shadow_selectedlight->color, color);
      radius = r_shadow_selectedlight->radius;
      style = r_shadow_selectedlight->style;
      if (r_shadow_selectedlight->cubemapname)
            strlcpy(cubemapname, r_shadow_selectedlight->cubemapname, sizeof(cubemapname));
      else
            cubemapname[0] = 0;
      shadows = r_shadow_selectedlight->shadow;
      corona = r_shadow_selectedlight->corona;
      coronasizescale = r_shadow_selectedlight->coronasizescale;
      ambientscale = r_shadow_selectedlight->ambientscale;
      diffusescale = r_shadow_selectedlight->diffusescale;
      specularscale = r_shadow_selectedlight->specularscale;
      flags = r_shadow_selectedlight->flags;
      normalmode = (flags & LIGHTFLAG_NORMALMODE) != 0;
      realtimemode = (flags & LIGHTFLAG_REALTIMEMODE) != 0;
      if (!strcmp(Cmd_Argv(1), "origin"))
      {
            if (Cmd_Argc() != 5)
            {
                  Con_Printf("usage: r_editlights_edit %s x y z\n", Cmd_Argv(1));
                  return;
            }
            origin[0] = atof(Cmd_Argv(2));
            origin[1] = atof(Cmd_Argv(3));
            origin[2] = atof(Cmd_Argv(4));
      }
      else if (!strcmp(Cmd_Argv(1), "originscale"))
      {
            if (Cmd_Argc() != 5)
            {
                  Con_Printf("usage: r_editlights_edit %s x y z\n", Cmd_Argv(1));
                  return;
            }
            origin[0] *= atof(Cmd_Argv(2));
            origin[1] *= atof(Cmd_Argv(3));
            origin[2] *= atof(Cmd_Argv(4));
      }
      else if (!strcmp(Cmd_Argv(1), "originx"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            origin[0] = atof(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "originy"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            origin[1] = atof(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "originz"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            origin[2] = atof(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "move"))
      {
            if (Cmd_Argc() != 5)
            {
                  Con_Printf("usage: r_editlights_edit %s x y z\n", Cmd_Argv(1));
                  return;
            }
            origin[0] += atof(Cmd_Argv(2));
            origin[1] += atof(Cmd_Argv(3));
            origin[2] += atof(Cmd_Argv(4));
      }
      else if (!strcmp(Cmd_Argv(1), "movex"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            origin[0] += atof(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "movey"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            origin[1] += atof(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "movez"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            origin[2] += atof(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "angles"))
      {
            if (Cmd_Argc() != 5)
            {
                  Con_Printf("usage: r_editlights_edit %s x y z\n", Cmd_Argv(1));
                  return;
            }
            angles[0] = atof(Cmd_Argv(2));
            angles[1] = atof(Cmd_Argv(3));
            angles[2] = atof(Cmd_Argv(4));
      }
      else if (!strcmp(Cmd_Argv(1), "anglesx"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            angles[0] = atof(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "anglesy"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            angles[1] = atof(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "anglesz"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            angles[2] = atof(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "color"))
      {
            if (Cmd_Argc() != 5)
            {
                  Con_Printf("usage: r_editlights_edit %s red green blue\n", Cmd_Argv(1));
                  return;
            }
            color[0] = atof(Cmd_Argv(2));
            color[1] = atof(Cmd_Argv(3));
            color[2] = atof(Cmd_Argv(4));
      }
      else if (!strcmp(Cmd_Argv(1), "radius"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            radius = atof(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "colorscale"))
      {
            if (Cmd_Argc() == 3)
            {
                  double scale = atof(Cmd_Argv(2));
                  color[0] *= scale;
                  color[1] *= scale;
                  color[2] *= scale;
            }
            else
            {
                  if (Cmd_Argc() != 5)
                  {
                        Con_Printf("usage: r_editlights_edit %s red green blue  (OR grey instead of red green blue)\n", Cmd_Argv(1));
                        return;
                  }
                  color[0] *= atof(Cmd_Argv(2));
                  color[1] *= atof(Cmd_Argv(3));
                  color[2] *= atof(Cmd_Argv(4));
            }
      }
      else if (!strcmp(Cmd_Argv(1), "radiusscale") || !strcmp(Cmd_Argv(1), "sizescale"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            radius *= atof(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "style"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            style = atoi(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "cubemap"))
      {
            if (Cmd_Argc() > 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            if (Cmd_Argc() == 3)
                  strlcpy(cubemapname, Cmd_Argv(2), sizeof(cubemapname));
            else
                  cubemapname[0] = 0;
      }
      else if (!strcmp(Cmd_Argv(1), "shadows"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            shadows = Cmd_Argv(2)[0] == 'y' || Cmd_Argv(2)[0] == 'Y' || Cmd_Argv(2)[0] == 't' || atoi(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "corona"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            corona = atof(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "coronasize"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            coronasizescale = atof(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "ambient"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            ambientscale = atof(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "diffuse"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            diffusescale = atof(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "specular"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            specularscale = atof(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "normalmode"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            normalmode = Cmd_Argv(2)[0] == 'y' || Cmd_Argv(2)[0] == 'Y' || Cmd_Argv(2)[0] == 't' || atoi(Cmd_Argv(2));
      }
      else if (!strcmp(Cmd_Argv(1), "realtimemode"))
      {
            if (Cmd_Argc() != 3)
            {
                  Con_Printf("usage: r_editlights_edit %s value\n", Cmd_Argv(1));
                  return;
            }
            realtimemode = Cmd_Argv(2)[0] == 'y' || Cmd_Argv(2)[0] == 'Y' || Cmd_Argv(2)[0] == 't' || atoi(Cmd_Argv(2));
      }
      else
      {
            Con_Print("usage: r_editlights_edit [property] [value]\n");
            Con_Print("Selected light's properties:\n");
            Con_Printf("Origin       : %f %f %f\n", r_shadow_selectedlight->origin[0], r_shadow_selectedlight->origin[1], r_shadow_selectedlight->origin[2]);
            Con_Printf("Angles       : %f %f %f\n", r_shadow_selectedlight->angles[0], r_shadow_selectedlight->angles[1], r_shadow_selectedlight->angles[2]);
            Con_Printf("Color        : %f %f %f\n", r_shadow_selectedlight->color[0], r_shadow_selectedlight->color[1], r_shadow_selectedlight->color[2]);
            Con_Printf("Radius       : %f\n", r_shadow_selectedlight->radius);
            Con_Printf("Corona       : %f\n", r_shadow_selectedlight->corona);
            Con_Printf("Style        : %i\n", r_shadow_selectedlight->style);
            Con_Printf("Shadows      : %s\n", r_shadow_selectedlight->shadow ? "yes" : "no");
            Con_Printf("Cubemap      : %s\n", r_shadow_selectedlight->cubemapname);
            Con_Printf("CoronaSize   : %f\n", r_shadow_selectedlight->coronasizescale);
            Con_Printf("Ambient      : %f\n", r_shadow_selectedlight->ambientscale);
            Con_Printf("Diffuse      : %f\n", r_shadow_selectedlight->diffusescale);
            Con_Printf("Specular     : %f\n", r_shadow_selectedlight->specularscale);
            Con_Printf("NormalMode   : %s\n", (r_shadow_selectedlight->flags & LIGHTFLAG_NORMALMODE) ? "yes" : "no");
            Con_Printf("RealTimeMode : %s\n", (r_shadow_selectedlight->flags & LIGHTFLAG_REALTIMEMODE) ? "yes" : "no");
            return;
      }
      flags = (normalmode ? LIGHTFLAG_NORMALMODE : 0) | (realtimemode ? LIGHTFLAG_REALTIMEMODE : 0);
      R_Shadow_UpdateWorldLight(r_shadow_selectedlight, origin, angles, color, radius, corona, style, shadows, cubemapname, coronasizescale, ambientscale, diffusescale, specularscale, flags);
}

void R_Shadow_EditLights_EditAll_f(void)
{
      size_t lightindex;
      dlight_t *light, *oldselected;
      size_t range;

      if (!r_editlights.integer)
      {
            Con_Print("Cannot edit lights when not in editing mode. Set r_editlights to 1.\n");
            return;
      }

      oldselected = r_shadow_selectedlight;
      // EditLights doesn't seem to have a "remove" command or something so:
      range = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray); // checked
      for (lightindex = 0;lightindex < range;lightindex++)
      {
            light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
            if (!light)
                  continue;
            R_Shadow_SelectLight(light);
            R_Shadow_EditLights_Edit_f();
      }
      // return to old selected (to not mess editing once selection is locked)
      R_Shadow_SelectLight(oldselected);
}

void R_Shadow_EditLights_DrawSelectedLightProperties(void)
{
      int lightnumber, lightcount;
      size_t lightindex, range;
      dlight_t *light;
      float x, y;
      char temp[256];
      if (!r_editlights.integer)
            return;
      x = vid_conwidth.value - 240;
      y = 5;
      DrawQ_Pic(x-5, y-5, NULL, 250, 155, 0, 0, 0, 0.75, 0);
      lightnumber = -1;
      lightcount = 0;
      range = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray); // checked
      for (lightindex = 0;lightindex < range;lightindex++)
      {
            light = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, lightindex);
            if (!light)
                  continue;
            if (light == r_shadow_selectedlight)
                  lightnumber = lightindex;
            lightcount++;
      }
      dpsnprintf(temp, sizeof(temp), "Cursor origin: %.0f %.0f %.0f", r_editlights_cursorlocation[0], r_editlights_cursorlocation[1], r_editlights_cursorlocation[2]); DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, false, FONT_DEFAULT);y += 8;
      dpsnprintf(temp, sizeof(temp), "Total lights : %i active (%i total)", lightcount, (int)Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray)); DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, false, FONT_DEFAULT);y += 8;
      y += 8;
      if (r_shadow_selectedlight == NULL)
            return;
      dpsnprintf(temp, sizeof(temp), "Light #%i properties:", lightnumber);DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, true, FONT_DEFAULT);y += 8;
      dpsnprintf(temp, sizeof(temp), "Origin       : %.0f %.0f %.0f\n", r_shadow_selectedlight->origin[0], r_shadow_selectedlight->origin[1], r_shadow_selectedlight->origin[2]);DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, true, FONT_DEFAULT);y += 8;
      dpsnprintf(temp, sizeof(temp), "Angles       : %.0f %.0f %.0f\n", r_shadow_selectedlight->angles[0], r_shadow_selectedlight->angles[1], r_shadow_selectedlight->angles[2]);DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, true, FONT_DEFAULT);y += 8;
      dpsnprintf(temp, sizeof(temp), "Color        : %.2f %.2f %.2f\n", r_shadow_selectedlight->color[0], r_shadow_selectedlight->color[1], r_shadow_selectedlight->color[2]);DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, true, FONT_DEFAULT);y += 8;
      dpsnprintf(temp, sizeof(temp), "Radius       : %.0f\n", r_shadow_selectedlight->radius);DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, true, FONT_DEFAULT);y += 8;
      dpsnprintf(temp, sizeof(temp), "Corona       : %.0f\n", r_shadow_selectedlight->corona);DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, true, FONT_DEFAULT);y += 8;
      dpsnprintf(temp, sizeof(temp), "Style        : %i\n", r_shadow_selectedlight->style);DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, true, FONT_DEFAULT);y += 8;
      dpsnprintf(temp, sizeof(temp), "Shadows      : %s\n", r_shadow_selectedlight->shadow ? "yes" : "no");DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, true, FONT_DEFAULT);y += 8;
      dpsnprintf(temp, sizeof(temp), "Cubemap      : %s\n", r_shadow_selectedlight->cubemapname);DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, true, FONT_DEFAULT);y += 8;
      dpsnprintf(temp, sizeof(temp), "CoronaSize   : %.2f\n", r_shadow_selectedlight->coronasizescale);DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, true, FONT_DEFAULT);y += 8;
      dpsnprintf(temp, sizeof(temp), "Ambient      : %.2f\n", r_shadow_selectedlight->ambientscale);DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, true, FONT_DEFAULT);y += 8;
      dpsnprintf(temp, sizeof(temp), "Diffuse      : %.2f\n", r_shadow_selectedlight->diffusescale);DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, true, FONT_DEFAULT);y += 8;
      dpsnprintf(temp, sizeof(temp), "Specular     : %.2f\n", r_shadow_selectedlight->specularscale);DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, true, FONT_DEFAULT);y += 8;
      dpsnprintf(temp, sizeof(temp), "NormalMode   : %s\n", (r_shadow_selectedlight->flags & LIGHTFLAG_NORMALMODE) ? "yes" : "no");DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, true, FONT_DEFAULT);y += 8;
      dpsnprintf(temp, sizeof(temp), "RealTimeMode : %s\n", (r_shadow_selectedlight->flags & LIGHTFLAG_REALTIMEMODE) ? "yes" : "no");DrawQ_String(x, y, temp, 0, 8, 8, 1, 1, 1, 1, 0, NULL, true, FONT_DEFAULT);y += 8;
}

void R_Shadow_EditLights_ToggleShadow_f(void)
{
      if (!r_editlights.integer)
      {
            Con_Print("Cannot spawn light when not in editing mode.  Set r_editlights to 1.\n");
            return;
      }
      if (!r_shadow_selectedlight)
      {
            Con_Print("No selected light.\n");
            return;
      }
      R_Shadow_UpdateWorldLight(r_shadow_selectedlight, r_shadow_selectedlight->origin, r_shadow_selectedlight->angles, r_shadow_selectedlight->color, r_shadow_selectedlight->radius, r_shadow_selectedlight->corona, r_shadow_selectedlight->style, !r_shadow_selectedlight->shadow, r_shadow_selectedlight->cubemapname, r_shadow_selectedlight->coronasizescale, r_shadow_selectedlight->ambientscale, r_shadow_selectedlight->diffusescale, r_shadow_selectedlight->specularscale, r_shadow_selectedlight->flags);
}

void R_Shadow_EditLights_ToggleCorona_f(void)
{
      if (!r_editlights.integer)
      {
            Con_Print("Cannot spawn light when not in editing mode.  Set r_editlights to 1.\n");
            return;
      }
      if (!r_shadow_selectedlight)
      {
            Con_Print("No selected light.\n");
            return;
      }
      R_Shadow_UpdateWorldLight(r_shadow_selectedlight, r_shadow_selectedlight->origin, r_shadow_selectedlight->angles, r_shadow_selectedlight->color, r_shadow_selectedlight->radius, !r_shadow_selectedlight->corona, r_shadow_selectedlight->style, r_shadow_selectedlight->shadow, r_shadow_selectedlight->cubemapname, r_shadow_selectedlight->coronasizescale, r_shadow_selectedlight->ambientscale, r_shadow_selectedlight->diffusescale, r_shadow_selectedlight->specularscale, r_shadow_selectedlight->flags);
}

void R_Shadow_EditLights_Remove_f(void)
{
      if (!r_editlights.integer)
      {
            Con_Print("Cannot remove light when not in editing mode.  Set r_editlights to 1.\n");
            return;
      }
      if (!r_shadow_selectedlight)
      {
            Con_Print("No selected light.\n");
            return;
      }
      R_Shadow_FreeWorldLight(r_shadow_selectedlight);
      r_shadow_selectedlight = NULL;
}

void R_Shadow_EditLights_Help_f(void)
{
      Con_Print(
"Documentation on r_editlights system:\n"
"Settings:\n"
"r_editlights : enable/disable editing mode\n"
"r_editlights_cursordistance : maximum distance of cursor from eye\n"
"r_editlights_cursorpushback : push back cursor this far from surface\n"
"r_editlights_cursorpushoff : push cursor off surface this far\n"
"r_editlights_cursorgrid : snap cursor to grid of this size\n"
"r_editlights_quakelightsizescale : imported quake light entity size scaling\n"
"Commands:\n"
"r_editlights_help : this help\n"
"r_editlights_clear : remove all lights\n"
"r_editlights_reload : reload .rtlights, .lights file, or entities\n"
"r_editlights_lock : lock selection to current light, if already locked - unlock\n"
"r_editlights_save : save to .rtlights file\n"
"r_editlights_spawn : create a light with default settings\n"
"r_editlights_edit command : edit selected light - more documentation below\n"
"r_editlights_remove : remove selected light\n"
"r_editlights_toggleshadow : toggles on/off selected light's shadow property\n"
"r_editlights_importlightentitiesfrommap : reload light entities\n"
"r_editlights_importlightsfile : reload .light file (produced by hlight)\n"
"Edit commands:\n"
"origin x y z : set light location\n"
"originx x: set x component of light location\n"
"originy y: set y component of light location\n"
"originz z: set z component of light location\n"
"move x y z : adjust light location\n"
"movex x: adjust x component of light location\n"
"movey y: adjust y component of light location\n"
"movez z: adjust z component of light location\n"
"angles x y z : set light angles\n"
"anglesx x: set x component of light angles\n"
"anglesy y: set y component of light angles\n"
"anglesz z: set z component of light angles\n"
"color r g b : set color of light (can be brighter than 1 1 1)\n"
"radius radius : set radius (size) of light\n"
"colorscale grey : multiply color of light (1 does nothing)\n"
"colorscale r g b : multiply color of light (1 1 1 does nothing)\n"
"radiusscale scale : multiply radius (size) of light (1 does nothing)\n"
"sizescale scale : multiply radius (size) of light (1 does nothing)\n"
"originscale x y z : multiply origin of light (1 1 1 does nothing)\n"
"style style : set lightstyle of light (flickering patterns, switches, etc)\n"
"cubemap basename : set filter cubemap of light (not yet supported)\n"
"shadows 1/0 : turn on/off shadows\n"
"corona n : set corona intensity\n"
"coronasize n : set corona size (0-1)\n"
"ambient n : set ambient intensity (0-1)\n"
"diffuse n : set diffuse intensity (0-1)\n"
"specular n : set specular intensity (0-1)\n"
"normalmode 1/0 : turn on/off rendering of this light in rtworld 0 mode\n"
"realtimemode 1/0 : turn on/off rendering of this light in rtworld 1 mode\n"
"<nothing> : print light properties to console\n"
      );
}

void R_Shadow_EditLights_CopyInfo_f(void)
{
      if (!r_editlights.integer)
      {
            Con_Print("Cannot copy light info when not in editing mode.  Set r_editlights to 1.\n");
            return;
      }
      if (!r_shadow_selectedlight)
      {
            Con_Print("No selected light.\n");
            return;
      }
      VectorCopy(r_shadow_selectedlight->angles, r_shadow_bufferlight.angles);
      VectorCopy(r_shadow_selectedlight->color, r_shadow_bufferlight.color);
      r_shadow_bufferlight.radius = r_shadow_selectedlight->radius;
      r_shadow_bufferlight.style = r_shadow_selectedlight->style;
      if (r_shadow_selectedlight->cubemapname)
            strlcpy(r_shadow_bufferlight.cubemapname, r_shadow_selectedlight->cubemapname, sizeof(r_shadow_bufferlight.cubemapname));
      else
            r_shadow_bufferlight.cubemapname[0] = 0;
      r_shadow_bufferlight.shadow = r_shadow_selectedlight->shadow;
      r_shadow_bufferlight.corona = r_shadow_selectedlight->corona;
      r_shadow_bufferlight.coronasizescale = r_shadow_selectedlight->coronasizescale;
      r_shadow_bufferlight.ambientscale = r_shadow_selectedlight->ambientscale;
      r_shadow_bufferlight.diffusescale = r_shadow_selectedlight->diffusescale;
      r_shadow_bufferlight.specularscale = r_shadow_selectedlight->specularscale;
      r_shadow_bufferlight.flags = r_shadow_selectedlight->flags;
}

void R_Shadow_EditLights_PasteInfo_f(void)
{
      if (!r_editlights.integer)
      {
            Con_Print("Cannot paste light info when not in editing mode.  Set r_editlights to 1.\n");
            return;
      }
      if (!r_shadow_selectedlight)
      {
            Con_Print("No selected light.\n");
            return;
      }
      R_Shadow_UpdateWorldLight(r_shadow_selectedlight, r_shadow_selectedlight->origin, r_shadow_bufferlight.angles, r_shadow_bufferlight.color, r_shadow_bufferlight.radius, r_shadow_bufferlight.corona, r_shadow_bufferlight.style, r_shadow_bufferlight.shadow, r_shadow_bufferlight.cubemapname, r_shadow_bufferlight.coronasizescale, r_shadow_bufferlight.ambientscale, r_shadow_bufferlight.diffusescale, r_shadow_bufferlight.specularscale, r_shadow_bufferlight.flags);
}

void R_Shadow_EditLights_Lock_f(void)
{
      if (!r_editlights.integer)
      {
            Con_Print("Cannot lock on light when not in editing mode.  Set r_editlights to 1.\n");
            return;
      }
      if (r_editlights_lockcursor)
      {
            r_editlights_lockcursor = false;
            return;
      }
      if (!r_shadow_selectedlight)
      {
            Con_Print("No selected light to lock on.\n");
            return;
      }
      r_editlights_lockcursor = true;
}

void R_Shadow_EditLights_Init(void)
{
      Cvar_RegisterVariable(&r_editlights);
      Cvar_RegisterVariable(&r_editlights_cursordistance);
      Cvar_RegisterVariable(&r_editlights_cursorpushback);
      Cvar_RegisterVariable(&r_editlights_cursorpushoff);
      Cvar_RegisterVariable(&r_editlights_cursorgrid);
      Cvar_RegisterVariable(&r_editlights_quakelightsizescale);
      Cmd_AddCommand("r_editlights_help", R_Shadow_EditLights_Help_f, "prints documentation on console commands and variables in rtlight editing system");
      Cmd_AddCommand("r_editlights_clear", R_Shadow_EditLights_Clear_f, "removes all world lights (let there be darkness!)");
      Cmd_AddCommand("r_editlights_reload", R_Shadow_EditLights_Reload_f, "reloads rtlights file (or imports from .lights file or .ent file or the map itself)");
      Cmd_AddCommand("r_editlights_save", R_Shadow_EditLights_Save_f, "save .rtlights file for current level");
      Cmd_AddCommand("r_editlights_spawn", R_Shadow_EditLights_Spawn_f, "creates a light with default properties (let there be light!)");
      Cmd_AddCommand("r_editlights_edit", R_Shadow_EditLights_Edit_f, "changes a property on the selected light");
      Cmd_AddCommand("r_editlights_editall", R_Shadow_EditLights_EditAll_f, "changes a property on ALL lights at once (tip: use radiusscale and colorscale to alter these properties)");
      Cmd_AddCommand("r_editlights_remove", R_Shadow_EditLights_Remove_f, "remove selected light");
      Cmd_AddCommand("r_editlights_toggleshadow", R_Shadow_EditLights_ToggleShadow_f, "toggle on/off the shadow option on the selected light");
      Cmd_AddCommand("r_editlights_togglecorona", R_Shadow_EditLights_ToggleCorona_f, "toggle on/off the corona option on the selected light");
      Cmd_AddCommand("r_editlights_importlightentitiesfrommap", R_Shadow_EditLights_ImportLightEntitiesFromMap_f, "load lights from .ent file or map entities (ignoring .rtlights or .lights file)");
      Cmd_AddCommand("r_editlights_importlightsfile", R_Shadow_EditLights_ImportLightsFile_f, "load lights from .lights file (ignoring .rtlights or .ent files and map entities)");
      Cmd_AddCommand("r_editlights_copyinfo", R_Shadow_EditLights_CopyInfo_f, "store a copy of all properties (except origin) of the selected light");
      Cmd_AddCommand("r_editlights_pasteinfo", R_Shadow_EditLights_PasteInfo_f, "apply the stored properties onto the selected light (making it exactly identical except for origin)");
      Cmd_AddCommand("r_editlights_lock", R_Shadow_EditLights_Lock_f, "lock selection to current light, if already locked - unlock");
}



/*
=============================================================================

LIGHT SAMPLING

=============================================================================
*/

void R_LightPoint(vec3_t color, const vec3_t p, const int flags)
{
      int i, numlights, flag;
      float f, relativepoint[3], dist, dist2, lightradius2;
      vec3_t diffuse, n;
      rtlight_t *light;
      dlight_t *dlight;

      if (r_fullbright.integer)
      {
            VectorSet(color, 1, 1, 1);
            return;
      }

      VectorClear(color);

      if (flags & LP_LIGHTMAP)
      {
            if (!r_fullbright.integer && r_refdef.scene.worldmodel && r_refdef.scene.worldmodel->lit && r_refdef.scene.worldmodel->brush.LightPoint)
            {
                  VectorClear(diffuse);
                  r_refdef.scene.worldmodel->brush.LightPoint(r_refdef.scene.worldmodel, p, color, diffuse, n);
                  VectorAdd(color, diffuse, color);
            }
            else
                  VectorSet(color, 1, 1, 1);
            color[0] += r_refdef.scene.ambient;
            color[1] += r_refdef.scene.ambient;
            color[2] += r_refdef.scene.ambient;
      }

      if (flags & LP_RTWORLD)
      {
            flag = r_refdef.scene.rtworld ? LIGHTFLAG_REALTIMEMODE : LIGHTFLAG_NORMALMODE;
            numlights = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray);
            for (i = 0; i < numlights; i++)
            {
                  dlight = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, i);
                  if (!dlight)
                        continue;
                  light = &dlight->rtlight;
                  if (!(light->flags & flag))
                        continue;
                  // sample
                  lightradius2 = light->radius * light->radius;
                  VectorSubtract(light->shadoworigin, p, relativepoint);
                  dist2 = VectorLength2(relativepoint);
                  if (dist2 >= lightradius2)
                        continue;
                  dist = sqrt(dist2) / light->radius;
                  f = dist < 1 ? (r_shadow_lightintensityscale.value * ((1.0f - dist) * r_shadow_lightattenuationlinearscale.value / (r_shadow_lightattenuationdividebias.value + dist*dist))) : 0;
                  if (f <= 0)
                        continue;
                  // todo: add to both ambient and diffuse
                  if (!light->shadow || CL_TraceLine(p, light->shadoworigin, MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false, true).fraction == 1)
                        VectorMA(color, f, light->currentcolor, color);
            }
      }
      if (flags & LP_DYNLIGHT)
      {
            // sample dlights
            for (i = 0;i < r_refdef.scene.numlights;i++)
            {
                  light = r_refdef.scene.lights[i];
                  // sample
                  lightradius2 = light->radius * light->radius;
                  VectorSubtract(light->shadoworigin, p, relativepoint);
                  dist2 = VectorLength2(relativepoint);
                  if (dist2 >= lightradius2)
                        continue;
                  dist = sqrt(dist2) / light->radius;
                  f = dist < 1 ? (r_shadow_lightintensityscale.value * ((1.0f - dist) * r_shadow_lightattenuationlinearscale.value / (r_shadow_lightattenuationdividebias.value + dist*dist))) : 0;
                  if (f <= 0)
                        continue;
                  // todo: add to both ambient and diffuse
                  if (!light->shadow || CL_TraceLine(p, light->shadoworigin, MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false, true).fraction == 1)
                        VectorMA(color, f, light->color, color);
            }
      }
}

void R_CompleteLightPoint(vec3_t ambient, vec3_t diffuse, vec3_t lightdir, const vec3_t p, const int flags)
{
      int i, numlights, flag;
      rtlight_t *light;
      dlight_t *dlight;
      float relativepoint[3];
      float color[3];
      float dir[3];
      float dist;
      float dist2;
      float intensity;
      float sample[5*3];
      float lightradius2;

      if (r_fullbright.integer)
      {
            VectorSet(ambient, 1, 1, 1);
            VectorClear(diffuse);
            VectorClear(lightdir);
            return;
      }

      if (flags == LP_LIGHTMAP)
      {
            VectorSet(ambient, r_refdef.scene.ambient, r_refdef.scene.ambient, r_refdef.scene.ambient);
            VectorClear(diffuse);
            VectorClear(lightdir);
            if (r_refdef.scene.worldmodel && r_refdef.scene.worldmodel->lit && r_refdef.scene.worldmodel->brush.LightPoint)
                  r_refdef.scene.worldmodel->brush.LightPoint(r_refdef.scene.worldmodel, p, ambient, diffuse, lightdir);
            else
                  VectorSet(ambient, 1, 1, 1);
            return;
      }

      memset(sample, 0, sizeof(sample));
      VectorSet(sample, r_refdef.scene.ambient, r_refdef.scene.ambient, r_refdef.scene.ambient);

      if ((flags & LP_LIGHTMAP) && r_refdef.scene.worldmodel && r_refdef.scene.worldmodel->lit && r_refdef.scene.worldmodel->brush.LightPoint)
      {
            vec3_t tempambient;
            VectorClear(tempambient);
            VectorClear(color);
            VectorClear(relativepoint);
            r_refdef.scene.worldmodel->brush.LightPoint(r_refdef.scene.worldmodel, p, tempambient, color, relativepoint);
            VectorScale(tempambient, r_refdef.lightmapintensity, tempambient);
            VectorScale(color, r_refdef.lightmapintensity, color);
            VectorAdd(sample, tempambient, sample);
            VectorMA(sample    , 0.5f            , color, sample    );
            VectorMA(sample + 3, relativepoint[0], color, sample + 3);
            VectorMA(sample + 6, relativepoint[1], color, sample + 6);
            VectorMA(sample + 9, relativepoint[2], color, sample + 9);
            // calculate a weighted average light direction as well
            intensity = VectorLength(color);
            VectorMA(sample + 12, intensity, relativepoint, sample + 12);
      }

      if (flags & LP_RTWORLD)
      {
            flag = r_refdef.scene.rtworld ? LIGHTFLAG_REALTIMEMODE : LIGHTFLAG_NORMALMODE;
            numlights = Mem_ExpandableArray_IndexRange(&r_shadow_worldlightsarray);
            for (i = 0; i < numlights; i++)
            {
                  dlight = (dlight_t *) Mem_ExpandableArray_RecordAtIndex(&r_shadow_worldlightsarray, i);
                  if (!dlight)
                        continue;
                  light = &dlight->rtlight;
                  if (!(light->flags & flag))
                        continue;
                  // sample
                  lightradius2 = light->radius * light->radius;
                  VectorSubtract(light->shadoworigin, p, relativepoint);
                  dist2 = VectorLength2(relativepoint);
                  if (dist2 >= lightradius2)
                        continue;
                  dist = sqrt(dist2) / light->radius;
                  intensity = min(1.0f, (1.0f - dist) * r_shadow_lightattenuationlinearscale.value / (r_shadow_lightattenuationdividebias.value + dist*dist)) * r_shadow_lightintensityscale.value;
                  if (intensity <= 0.0f)
                        continue;
                  if (light->shadow && CL_TraceLine(p, light->shadoworigin, MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false, true).fraction < 1)
                        continue;
                  // scale down intensity to add to both ambient and diffuse
                  //intensity *= 0.5f;
                  VectorNormalize(relativepoint);
                  VectorScale(light->currentcolor, intensity, color);
                  VectorMA(sample    , 0.5f            , color, sample    );
                  VectorMA(sample + 3, relativepoint[0], color, sample + 3);
                  VectorMA(sample + 6, relativepoint[1], color, sample + 6);
                  VectorMA(sample + 9, relativepoint[2], color, sample + 9);
                  // calculate a weighted average light direction as well
                  intensity *= VectorLength(color);
                  VectorMA(sample + 12, intensity, relativepoint, sample + 12);
            }
      }

      if (flags & LP_DYNLIGHT)
      {
            // sample dlights
            for (i = 0;i < r_refdef.scene.numlights;i++)
            {
                  light = r_refdef.scene.lights[i];
                  // sample
                  lightradius2 = light->radius * light->radius;
                  VectorSubtract(light->shadoworigin, p, relativepoint);
                  dist2 = VectorLength2(relativepoint);
                  if (dist2 >= lightradius2)
                        continue;
                  dist = sqrt(dist2) / light->radius;
                  intensity = (1.0f - dist) * r_shadow_lightattenuationlinearscale.value / (r_shadow_lightattenuationdividebias.value + dist*dist) * r_shadow_lightintensityscale.value;
                  if (intensity <= 0.0f)
                        continue;
                  if (light->shadow && CL_TraceLine(p, light->shadoworigin, MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false, true).fraction < 1)
                        continue;
                  // scale down intensity to add to both ambient and diffuse
                  //intensity *= 0.5f;
                  VectorNormalize(relativepoint);
                  VectorScale(light->currentcolor, intensity, color);
                  VectorMA(sample    , 0.5f            , color, sample    );
                  VectorMA(sample + 3, relativepoint[0], color, sample + 3);
                  VectorMA(sample + 6, relativepoint[1], color, sample + 6);
                  VectorMA(sample + 9, relativepoint[2], color, sample + 9);
                  // calculate a weighted average light direction as well
                  intensity *= VectorLength(color);
                  VectorMA(sample + 12, intensity, relativepoint, sample + 12);
            }
      }

      // calculate the direction we'll use to reduce the sample to a directional light source
      VectorCopy(sample + 12, dir);
      //VectorSet(dir, sample[3] + sample[4] + sample[5], sample[6] + sample[7] + sample[8], sample[9] + sample[10] + sample[11]);
      VectorNormalize(dir);
      // extract the diffuse color along the chosen direction and scale it
      diffuse[0] = (dir[0]*sample[3] + dir[1]*sample[6] + dir[2]*sample[ 9] + sample[ 0]);
      diffuse[1] = (dir[0]*sample[4] + dir[1]*sample[7] + dir[2]*sample[10] + sample[ 1]);
      diffuse[2] = (dir[0]*sample[5] + dir[1]*sample[8] + dir[2]*sample[11] + sample[ 2]);
      // subtract some of diffuse from ambient
      VectorMA(sample, -0.333f, diffuse, ambient);
      // store the normalized lightdir
      VectorCopy(dir, lightdir);
}

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