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vid_glx.c

/*
Copyright (C) 1996-1997 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#include <signal.h>

#include <dlfcn.h>

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <X11/XKBlib.h> // TODO possibly ifdef this out on non-supporting systems... Solaris (as always)?
#include <GL/glx.h>

#include "quakedef.h"
#include "dpsoftrast.h"

#include <X11/keysym.h>
#include <X11/cursorfont.h>
#include <X11/xpm.h>

#include <X11/extensions/XShm.h>
#if !defined(__APPLE__) && !defined(__MACH__) && !defined(SUNOS)
#include <X11/extensions/xf86dga.h>
#endif
#include <X11/extensions/xf86vmode.h>

#include <sys/ipc.h>
#include <sys/shm.h>
#include <X11/extensions/XShm.h>

// get the Uchar type
#include "utf8lib.h"
#include "image.h"

#include "nexuiz.xpm"
#include "darkplaces.xpm"

// Tell startup code that we have a client
int cl_available = true;

// note: if we used the XRandR extension we could support refresh rates
qboolean vid_supportrefreshrate = false;

//GLX prototypes
XVisualInfo *(GLAPIENTRY *qglXChooseVisual)(Display *dpy, int screen, int *attribList);
GLXContext (GLAPIENTRY *qglXCreateContext)(Display *dpy, XVisualInfo *vis, GLXContext shareList, Bool direct);
void (GLAPIENTRY *qglXDestroyContext)(Display *dpy, GLXContext ctx);
Bool (GLAPIENTRY *qglXMakeCurrent)(Display *dpy, GLXDrawable drawable, GLXContext ctx);
void (GLAPIENTRY *qglXSwapBuffers)(Display *dpy, GLXDrawable drawable);
const char *(GLAPIENTRY *qglXQueryExtensionsString)(Display *dpy, int screen);

//GLX_ARB_get_proc_address
void *(GLAPIENTRY *qglXGetProcAddressARB)(const GLubyte *procName);

static dllfunction_t getprocaddressfuncs[] =
{
      {"glXGetProcAddressARB", (void **) &qglXGetProcAddressARB},
      {NULL, NULL}
};

//GLX_SGI_swap_control
GLint (GLAPIENTRY *qglXSwapIntervalSGI)(GLint interval);

static dllfunction_t swapcontrolfuncs[] =
{
      {"glXSwapIntervalSGI", (void **) &qglXSwapIntervalSGI},
      {NULL, NULL}
};

static Display *vidx11_display = NULL;
static int vidx11_screen;
static Window win, root;
static GLXContext ctx = NULL;
static GC vidx11_gc = NULL;
static XImage *vidx11_ximage[2] = { NULL, NULL };
static int vidx11_ximage_pos = 0;
static XShmSegmentInfo vidx11_shminfo[2];
static int vidx11_shmevent = -1;
static int vidx11_shmwait = 0; // number of frames outstanding

Atom wm_delete_window_atom;
Atom net_wm_state_atom;
Atom net_wm_state_hidden_atom;
Atom net_wm_state_fullscreen_atom;
Atom net_wm_icon;
Atom cardinal;

#define KEY_MASK (KeyPressMask | KeyReleaseMask)
#define MOUSE_MASK (ButtonPressMask | ButtonReleaseMask | \
                PointerMotionMask | ButtonMotionMask)
#define X_MASK (KEY_MASK | MOUSE_MASK | VisibilityChangeMask | \
            StructureNotifyMask | FocusChangeMask | EnterWindowMask | \
            LeaveWindowMask)


static qboolean mouse_avail = true;
static qboolean vid_usingmousegrab = false;
static qboolean vid_usingmouse = false;
static qboolean vid_usinghidecursor = false;
static qboolean vid_usingvsync = false;
static qboolean vid_usevsync = false;
static qboolean vid_x11_hardwaregammasupported = false;
static qboolean vid_x11_dgasupported = false;
static int vid_x11_gammarampsize = 0;

#if !defined(__APPLE__) && !defined(SUNOS)
cvar_t vid_dgamouse = {CVAR_SAVE, "vid_dgamouse", "0", "make use of DGA mouse input"};
static qboolean vid_usingdgamouse = false;
#endif
cvar_t vid_netwmfullscreen = {CVAR_SAVE, "vid_netwmfullscreen", "0", "make use _NET_WM_STATE_FULLSCREEN; turn this off if fullscreen does not work for you"};

qboolean vidmode_ext = false;

static int win_x, win_y;

static XF86VidModeModeInfo init_vidmode, game_vidmode;
static qboolean vid_isfullscreen = false;
static qboolean vid_isvidmodefullscreen = false;
static qboolean vid_isnetwmfullscreen = false;
static qboolean vid_isoverrideredirect = false;

static Visual *vidx11_visual;
static Colormap vidx11_colormap;

/*-----------------------------------------------------------------------*/
//

long keysym2ucs(KeySym keysym);
void DP_Xutf8LookupString(XKeyEvent * ev,
                   Uchar *uch,
                   KeySym * keysym_return,
                   Status * status_return)
{
      int rc;
      KeySym keysym;
      int codepoint;
      char buffer[64];
      int nbytes = sizeof(buffer);

      rc = XLookupString(ev, buffer, nbytes, &keysym, NULL);

      if (rc > 0) {
            codepoint = buffer[0] & 0xFF;
      } else {
            codepoint = keysym2ucs(keysym);
      }

      if (codepoint < 0) {
            if (keysym == None) {
                  *status_return = XLookupNone;
            } else {
                  *status_return = XLookupKeySym;
                  *keysym_return = keysym;
            }
            *uch = 0;
            return;
      }

      *uch = codepoint;

      if (keysym != None) {
            *keysym_return = keysym;
            *status_return = XLookupBoth;
      } else {
            *status_return = XLookupChars;
      }
}
static int XLateKey(XKeyEvent *ev, Uchar *ascii)
{
      int key = 0;
      //char buf[64];
      KeySym keysym, shifted;
      Status status;

      keysym = XLookupKeysym (ev, 0);
      DP_Xutf8LookupString(ev, ascii, &shifted, &status);

      switch(keysym)
      {
            case XK_KP_Page_Up:      key = K_KP_PGUP; break;
            case XK_Page_Up:   key = K_PGUP; break;

            case XK_KP_Page_Down: key = K_KP_PGDN; break;
            case XK_Page_Down:       key = K_PGDN; break;

            case XK_KP_Home: key = K_KP_HOME; break;
            case XK_Home:      key = K_HOME; break;

            case XK_KP_End:  key = K_KP_END; break;
            case XK_End:       key = K_END; break;

            case XK_KP_Left: key = K_KP_LEFTARROW; break;
            case XK_Left:      key = K_LEFTARROW; break;

            case XK_KP_Right: key = K_KP_RIGHTARROW; break;
            case XK_Right:    key = K_RIGHTARROW;           break;

            case XK_KP_Down: key = K_KP_DOWNARROW; break;
            case XK_Down:      key = K_DOWNARROW; break;

            case XK_KP_Up:   key = K_KP_UPARROW; break;
            case XK_Up:        key = K_UPARROW;  break;

            case XK_Escape: key = K_ESCAPE;           break;

            case XK_KP_Enter: key = K_KP_ENTER; break;
            case XK_Return: key = K_ENTER;             break;

            case XK_Tab:            key = K_TAB;                   break;

            case XK_F1:        key = K_F1;                        break;

            case XK_F2:        key = K_F2;                        break;

            case XK_F3:        key = K_F3;                        break;

            case XK_F4:        key = K_F4;                        break;

            case XK_F5:        key = K_F5;                        break;

            case XK_F6:        key = K_F6;                        break;

            case XK_F7:        key = K_F7;                        break;

            case XK_F8:        key = K_F8;                        break;

            case XK_F9:        key = K_F9;                        break;

            case XK_F10:            key = K_F10;                   break;

            case XK_F11:            key = K_F11;                   break;

            case XK_F12:            key = K_F12;                   break;

            case XK_BackSpace: key = K_BACKSPACE; break;

            case XK_KP_Delete: key = K_KP_DEL; break;
            case XK_Delete: key = K_DEL; break;

            case XK_Pause:    key = K_PAUSE;           break;

            case XK_Shift_L:
            case XK_Shift_R:  key = K_SHIFT;          break;

            case XK_Execute:
            case XK_Control_L:
            case XK_Control_R:      key = K_CTRL;            break;

            case XK_Alt_L:
            case XK_Meta_L:
            case XK_ISO_Level3_Shift:
            case XK_Alt_R:
            case XK_Meta_R: key = K_ALT;              break;

            case XK_KP_Begin: key = K_KP_5;     break;

            case XK_Insert:key = K_INS; break;
            case XK_KP_Insert: key = K_KP_INS; break;

            case XK_KP_Multiply: key = K_KP_MULTIPLY; break;
            case XK_KP_Add:  key = K_KP_PLUS; break;
            case XK_KP_Subtract: key = K_KP_MINUS; break;
            case XK_KP_Divide: key = K_KP_SLASH; break;

            case XK_asciicircum:    *ascii = key = '^'; break; // for some reason, XLookupString returns "" on this one for Grunt|2

            case XK_section:  *ascii = key = '~'; break;

            default:
                  if (keysym < 32)
                        break;

                  if (keysym >= 'A' && keysym <= 'Z')
                        key = keysym - 'A' + 'a';
                  else
                        key = keysym;

                  break;
      }

      return key;
}

static Cursor CreateNullCursor(Display *display, Window root)
{
      Pixmap cursormask;
      XGCValues xgc;
      GC gc;
      XColor dummycolour;
      Cursor cursor;

      cursormask = XCreatePixmap(display, root, 1, 1, 1);
      xgc.function = GXclear;
      gc =  XCreateGC(display, cursormask, GCFunction, &xgc);
      XFillRectangle(display, cursormask, gc, 0, 0, 1, 1);
      dummycolour.pixel = 0;
      dummycolour.red = 0;
      dummycolour.flags = 04;
      cursor = XCreatePixmapCursor(display, cursormask, cursormask, &dummycolour,&dummycolour, 0,0);
      XFreePixmap(display,cursormask);
      XFreeGC(display,gc);
      return cursor;
}

void VID_SetMouse(qboolean fullscreengrab, qboolean relative, qboolean hidecursor)
{
      static int originalmouseparms_num;
      static int originalmouseparms_denom;
      static int originalmouseparms_threshold;
      static qboolean restore_spi;

#if !defined(__APPLE__) && !defined(SUNOS)
      qboolean usedgamouse;
#endif

      if (!vidx11_display || !win)
            return;

      if (relative)
            fullscreengrab = true;

      if (!mouse_avail)
            fullscreengrab = relative = hidecursor = false;

#if !defined(__APPLE__) && !defined(SUNOS)
      usedgamouse = relative && vid_dgamouse.integer;
      if (!vid_x11_dgasupported)
            usedgamouse = false;
      if (fullscreengrab && vid_usingmouse && (vid_usingdgamouse != usedgamouse))
            VID_SetMouse(false, false, false); // ungrab first!
#endif

      if (vid_usingmousegrab != fullscreengrab)
      {
            vid_usingmousegrab = fullscreengrab;
            cl_ignoremousemoves = 2;
            if (fullscreengrab)
            {
                  XGrabPointer(vidx11_display, win,  True, 0, GrabModeAsync, GrabModeAsync, win, None, CurrentTime);
                  if (vid_grabkeyboard.integer || vid_isoverrideredirect)
                        XGrabKeyboard(vidx11_display, win, False, GrabModeAsync, GrabModeAsync, CurrentTime);
            }
            else
            {
                  XUngrabPointer(vidx11_display, CurrentTime);
                  XUngrabKeyboard(vidx11_display, CurrentTime);
            }
      }

      if (relative)
      {
            if (!vid_usingmouse)
            {
                  XWindowAttributes attribs_1;
                  XSetWindowAttributes attribs_2;

                  XGetWindowAttributes(vidx11_display, win, &attribs_1);
                  attribs_2.event_mask = attribs_1.your_event_mask | KEY_MASK | MOUSE_MASK;
                  XChangeWindowAttributes(vidx11_display, win, CWEventMask, &attribs_2);

#if !defined(__APPLE__) && !defined(SUNOS)
                  vid_usingdgamouse = usedgamouse;
                  if (usedgamouse)
                  {
                        XF86DGADirectVideo(vidx11_display, DefaultScreen(vidx11_display), XF86DGADirectMouse);
                        XWarpPointer(vidx11_display, None, win, 0, 0, 0, 0, 0, 0);
                  }
                  else
#endif
                        XWarpPointer(vidx11_display, None, win, 0, 0, 0, 0, vid.width / 2, vid.height / 2);

// COMMANDLINEOPTION: X11 Input: -noforcemparms disables setting of mouse parameters (not used with DGA, windows only)
#if !defined(__APPLE__) && !defined(SUNOS)
                  if (!COM_CheckParm ("-noforcemparms") && !usedgamouse)
#else
                  if (!COM_CheckParm ("-noforcemparms"))
#endif
                  {
                        XGetPointerControl(vidx11_display, &originalmouseparms_num, &originalmouseparms_denom, &originalmouseparms_threshold);
                        XChangePointerControl (vidx11_display, true, false, 1, 1, -1); // TODO maybe change threshold here, or remove this comment
                        restore_spi = true;
                  }
                  else
                        restore_spi = false;

                  cl_ignoremousemoves = 2;
                  vid_usingmouse = true;
            }
      }
      else
      {
            if (vid_usingmouse)
            {
#if !defined(__APPLE__) && !defined(SUNOS)
                  if (vid_usingdgamouse)
                        XF86DGADirectVideo(vidx11_display, DefaultScreen(vidx11_display), 0);
                  vid_usingdgamouse = false;
#endif
                  cl_ignoremousemoves = 2;

                  if (restore_spi)
                        XChangePointerControl (vidx11_display, true, true, originalmouseparms_num, originalmouseparms_denom, originalmouseparms_threshold);
                  restore_spi = false;

                  vid_usingmouse = false;
            }
      }

      if (vid_usinghidecursor != hidecursor)
      {
            vid_usinghidecursor = hidecursor;
            if (hidecursor)
                  XDefineCursor(vidx11_display, win, CreateNullCursor(vidx11_display, win));
            else
                  XUndefineCursor(vidx11_display, win);
      }
}

static keynum_t buttonremap[18] =
{
      K_MOUSE1,
      K_MOUSE3,
      K_MOUSE2,
      K_MWHEELUP,
      K_MWHEELDOWN,
      K_MOUSE4,
      K_MOUSE5,
      K_MOUSE6,
      K_MOUSE7,
      K_MOUSE8,
      K_MOUSE9,
      K_MOUSE10,
      K_MOUSE11,
      K_MOUSE12,
      K_MOUSE13,
      K_MOUSE14,
      K_MOUSE15,
      K_MOUSE16,
};

static qboolean BuildXImages(int w, int h)
{
      int i;
      if(DefaultDepth(vidx11_display, vidx11_screen) != 32 && DefaultDepth(vidx11_display, vidx11_screen) != 24)
      {
            Con_Printf("Sorry, we only support 24bpp and 32bpp modes\n");
            VID_Shutdown();
            return false;
      }
      // match to dpsoftrast's specs
      if(vidx11_visual->red_mask != 0x00FF0000)
      {
            Con_Printf("Sorry, we only support BGR visuals\n");
            VID_Shutdown();
            return false;
      }
      if(vidx11_visual->green_mask != 0x0000FF00)
      {
            Con_Printf("Sorry, we only support BGR visuals\n");
            VID_Shutdown();
            return false;
      }
      if(vidx11_visual->blue_mask != 0x000000FF)
      {
            Con_Printf("Sorry, we only support BGR visuals\n");
            VID_Shutdown();
            return false;
      }
      if(vidx11_shmevent >= 0)
      {
            for(i = 0; i < 2; ++i)
            {
                  vidx11_shminfo[i].shmid = -1;
                  vidx11_ximage[i] = XShmCreateImage(vidx11_display, vidx11_visual, DefaultDepth(vidx11_display, vidx11_screen), ZPixmap, NULL, &vidx11_shminfo[i], w, h);
                  if(!vidx11_ximage[i])
                  {
                        Con_Printf("Failed to get an XImage segment\n");
                        VID_Shutdown();
                        return false;
                  }
                  if(vidx11_ximage[i]->bytes_per_line != w * 4)
                  {
                        Con_Printf("Sorry, we only support linear pixel layout\n");
                        VID_Shutdown();
                        return false;
                  }
                  vidx11_shminfo[i].shmid = shmget(IPC_PRIVATE, vidx11_ximage[i]->bytes_per_line * vidx11_ximage[i]->height, IPC_CREAT|0777);
                  if(vidx11_shminfo[i].shmid < 0)
                  {
                        Con_Printf("Failed to get a shm segment\n");
                        VID_Shutdown();
                        return false;
                  }
                  vidx11_shminfo[i].shmaddr = vidx11_ximage[i]->data = shmat(vidx11_shminfo[i].shmid, NULL, 0);
                  if(!vidx11_shminfo[i].shmaddr)
                  {
                        Con_Printf("Failed to get a shm segment addresst\n");
                        VID_Shutdown();
                        return false;
                  }
                  vidx11_shminfo[i].readOnly = True;
                  XShmAttach(vidx11_display, &vidx11_shminfo[i]);
            }
      }
      else
      {
            for(i = 0; i < 1; ++i) // we only need one buffer if we don't use Xshm
            {
                  char *p = calloc(4, w * h);
                  vidx11_shminfo[i].shmid = -1;
                  vidx11_ximage[i] = XCreateImage(vidx11_display, vidx11_visual, DefaultDepth(vidx11_display, vidx11_screen), ZPixmap, 0, (char*)p, w, h, 8, 0);
                  if(!vidx11_ximage[i])
                  {
                        Con_Printf("Failed to get an XImage segment\n");
                        VID_Shutdown();
                        return false;
                  }
                  if(vidx11_ximage[i]->bytes_per_line != w * 4)
                  {
                        Con_Printf("Sorry, we only support linear pixel layout\n");
                        VID_Shutdown();
                        return false;
                  }
            }
      }
      return true;
}
static void DestroyXImages(void)
{
      int i;
      for(i = 0; i < 2; ++i)
      {
            if(vidx11_shminfo[i].shmid >= 0)
            {
                  XShmDetach(vidx11_display, &vidx11_shminfo[i]);
                  XDestroyImage(vidx11_ximage[i]);
                  vidx11_ximage[i] = NULL;
                  shmdt(vidx11_shminfo[i].shmaddr);
                  shmctl(vidx11_shminfo[i].shmid, IPC_RMID, 0);
                  vidx11_shminfo[i].shmid = -1;
            }
            if(vidx11_ximage[i])
                  XDestroyImage(vidx11_ximage[i]);
            vidx11_ximage[i] = 0;
      }
}

static int in_mouse_x_save = 0, in_mouse_y_save = 0;
static void HandleEvents(void)
{
      XEvent event;
      int key;
      Uchar unicode;
      qboolean dowarp = false;

      if (!vidx11_display)
            return;

      in_mouse_x += in_mouse_x_save;
      in_mouse_y += in_mouse_y_save;
      in_mouse_x_save = 0;
      in_mouse_y_save = 0;

      while (XPending(vidx11_display))
      {
            XNextEvent(vidx11_display, &event);

            switch (event.type)
            {
            case KeyPress:
                  // key pressed
                  key = XLateKey (&event.xkey, &unicode);
                  Key_Event(key, unicode, true);
                  break;

            case KeyRelease:
                  // key released
                  key = XLateKey (&event.xkey, &unicode);
                  Key_Event(key, unicode, false);
                  break;

            case MotionNotify:
                  // mouse moved
                  if (vid_usingmouse)
                  {
#if !defined(__APPLE__) && !defined(SUNOS)
                        if (vid_usingdgamouse)
                        {
                              in_mouse_x += event.xmotion.x_root;
                              in_mouse_y += event.xmotion.y_root;
                        }
                        else
#endif
                        {
                              if (!event.xmotion.send_event)
                              {
                                    in_mouse_x += event.xmotion.x - in_windowmouse_x;
                                    in_mouse_y += event.xmotion.y - in_windowmouse_y;
                                    //if (abs(vid.width/2 - event.xmotion.x) + abs(vid.height/2 - event.xmotion.y))
                                    if (vid_stick_mouse.integer || abs(vid.width/2 - event.xmotion.x) > vid.width / 4 || abs(vid.height/2 - event.xmotion.y) > vid.height / 4)
                                          dowarp = true;
                              }
                        }
                  }
                  in_windowmouse_x = event.xmotion.x;
                  in_windowmouse_y = event.xmotion.y;
                  break;

            case ButtonPress:
                  // mouse button pressed
                  if (event.xbutton.button <= 18)
                        Key_Event(buttonremap[event.xbutton.button - 1], 0, true);
                  else
                        Con_Printf("HandleEvents: ButtonPress gave value %d, 1-18 expected\n", event.xbutton.button);
                  break;

            case ButtonRelease:
                  // mouse button released
                  if (event.xbutton.button <= 18)
                        Key_Event(buttonremap[event.xbutton.button - 1], 0, false);
                  else
                        Con_Printf("HandleEvents: ButtonRelease gave value %d, 1-18 expected\n", event.xbutton.button);
                  break;

            case CreateNotify:
                  // window created
                  win_x = event.xcreatewindow.x;
                  win_y = event.xcreatewindow.y;
                  break;

            case ConfigureNotify:
                  // window changed size/location
                  win_x = event.xconfigure.x;
                  win_y = event.xconfigure.y;
                  if((vid_resizable.integer < 2 || vid_isnetwmfullscreen) && (vid.width != event.xconfigure.width || vid.height != event.xconfigure.height))
                  {
                        vid.width = event.xconfigure.width;
                        vid.height = event.xconfigure.height;
                        if(vid_isnetwmfullscreen)
                              Con_Printf("NetWM fullscreen: actually using resolution %dx%d\n", vid.width, vid.height);
                        else
                              Con_DPrintf("Updating to ConfigureNotify resolution %dx%d\n", vid.width, vid.height);

                        DPSOFTRAST_Flush();

                        if(vid.softdepthpixels)
                              free(vid.softdepthpixels);

                        DestroyXImages();
                        XSync(vidx11_display, False);
                        if(!BuildXImages(vid.width, vid.height))
                              return;
                        XSync(vidx11_display, False);

                        vid.softpixels = (unsigned int *) vidx11_ximage[vidx11_ximage_pos]->data;
                        vid.softdepthpixels = (unsigned int *)calloc(4, vid.width * vid.height);
                  }
                  break;
            case DestroyNotify:
                  // window has been destroyed
                  Sys_Quit(0);
                  break;
            case ClientMessage:
                  // window manager messages
                  if ((event.xclient.format == 32) && ((unsigned int)event.xclient.data.l[0] == wm_delete_window_atom))
                        Sys_Quit(0);
                  break;
            case MapNotify:
                  if (vid_isoverrideredirect)
                        break;
                  // window restored
                  vid_hidden = false;
                  VID_RestoreSystemGamma();

                  if(vid_isvidmodefullscreen)
                  {
                        // set our video mode
                        XF86VidModeSwitchToMode(vidx11_display, vidx11_screen, &game_vidmode);

                        // Move the viewport to top left
                        XF86VidModeSetViewPort(vidx11_display, vidx11_screen, 0, 0);
                  }

                  if(vid_isnetwmfullscreen)
                  {
                        // make sure it's fullscreen
                        XEvent event;
                        event.type = ClientMessage;
                        event.xclient.serial = 0;
                        event.xclient.send_event = True;
                        event.xclient.message_type = net_wm_state_atom;
                        event.xclient.window = win;
                        event.xclient.format = 32;
                        event.xclient.data.l[0] = 1;
                        event.xclient.data.l[1] = net_wm_state_fullscreen_atom;
                        event.xclient.data.l[2] = 0;
                        event.xclient.data.l[3] = 1;
                        event.xclient.data.l[4] = 0;
                        XSendEvent(vidx11_display, root, False, SubstructureRedirectMask | SubstructureNotifyMask, &event);
                  }

                  dowarp = true;

                  break;
            case UnmapNotify:
                  if (vid_isoverrideredirect)
                        break;
                  // window iconified/rolledup/whatever
                  vid_hidden = true;
                  VID_RestoreSystemGamma();

                  if(vid_isvidmodefullscreen)
                        XF86VidModeSwitchToMode(vidx11_display, vidx11_screen, &init_vidmode);

                  break;
            case FocusIn:
                  if (vid_isoverrideredirect)
                        break;
                  // window is now the input focus
                  vid_activewindow = true;
                  break;
            case FocusOut:
                  if (vid_isoverrideredirect)
                        break;

                  if(vid_isnetwmfullscreen && event.xfocus.mode == NotifyNormal)
                  {
                        // iconify netwm fullscreen window when it loses focus
                        // when the user selects it in the taskbar, the window manager will map it again and send MapNotify
                        XEvent event;
                        event.type = ClientMessage;
                        event.xclient.serial = 0;
                        event.xclient.send_event = True;
                        event.xclient.message_type = net_wm_state_atom;
                        event.xclient.window = win;
                        event.xclient.format = 32;
                        event.xclient.data.l[0] = 1;
                        event.xclient.data.l[1] = net_wm_state_hidden_atom;
                        event.xclient.data.l[2] = 0;
                        event.xclient.data.l[3] = 1;
                        event.xclient.data.l[4] = 0;
                        XSendEvent(vidx11_display, root, False, SubstructureRedirectMask | SubstructureNotifyMask, &event);
                  }

                  // window is no longer the input focus
                  vid_activewindow = false;
                  VID_RestoreSystemGamma();

                  break;
            case EnterNotify:
                  // mouse entered window
                  break;
            case LeaveNotify:
                  // mouse left window
                  break;
            default:
                  if(vidx11_shmevent >= 0 && event.type == vidx11_shmevent)
                        --vidx11_shmwait;
                  break;
            }
      }

      if (dowarp)
      {
            /* move the mouse to the window center again */
            // we'll catch the warp motion by its send_event flag, updating the
            // stored mouse position without adding any delta motion
            XEvent event;
            event.type = MotionNotify;
            event.xmotion.display = vidx11_display;
            event.xmotion.window = win;
            event.xmotion.x = vid.width / 2;
            event.xmotion.y = vid.height / 2;
            XSendEvent(vidx11_display, win, False, PointerMotionMask, &event);
            XWarpPointer(vidx11_display, None, win, 0, 0, 0, 0, vid.width / 2, vid.height / 2);
      }
}

static void *prjobj = NULL;

static void GL_CloseLibrary(void)
{
      if (prjobj)
            dlclose(prjobj);
      prjobj = NULL;
      gl_driver[0] = 0;
      qglXGetProcAddressARB = NULL;
      gl_extensions = "";
      gl_platform = "";
      gl_platformextensions = "";
}

static int GL_OpenLibrary(const char *name)
{
      Con_Printf("Loading OpenGL driver %s\n", name);
      GL_CloseLibrary();
      if (!(prjobj = dlopen(name, RTLD_LAZY | RTLD_GLOBAL)))
      {
            Con_Printf("Unable to open symbol list for %s\n", name);
            return false;
      }
      strlcpy(gl_driver, name, sizeof(gl_driver));
      return true;
}

void *GL_GetProcAddress(const char *name)
{
      void *p = NULL;
      if (qglXGetProcAddressARB != NULL)
            p = (void *) qglXGetProcAddressARB((GLubyte *)name);
      if (p == NULL)
            p = (void *) dlsym(prjobj, name);
      return p;
}

void VID_Shutdown(void)
{
      if (!vidx11_display)
            return;

      VID_EnableJoystick(false);
      VID_SetMouse(false, false, false);
      VID_RestoreSystemGamma();

      // FIXME: glXDestroyContext here?
      if (vid_isvidmodefullscreen)
            XF86VidModeSwitchToMode(vidx11_display, vidx11_screen, &init_vidmode);

      if(vidx11_gc)
            XFreeGC(vidx11_display, vidx11_gc);
      vidx11_gc = NULL;

      DestroyXImages();
      vidx11_shmevent = -1;
      vid.softpixels = NULL;

      if (vid.softdepthpixels)
            free(vid.softdepthpixels);
      vid.softdepthpixels = NULL;

      if (win)
            XDestroyWindow(vidx11_display, win);
      XCloseDisplay(vidx11_display);

      vid_hidden = true;
      vid_isfullscreen = false;
      vid_isnetwmfullscreen = false;
      vid_isvidmodefullscreen = false;
      vid_isoverrideredirect = false;
      vidx11_display = NULL;
      win = 0;
      ctx = NULL;

      GL_CloseLibrary();
      Key_ClearStates ();
}

void signal_handler(int sig)
{
      Con_Printf("Received signal %d, exiting...\n", sig);
      VID_RestoreSystemGamma();
      Sys_Quit(1);
}

void InitSig(void)
{
      signal(SIGHUP, signal_handler);
      signal(SIGINT, signal_handler);
      signal(SIGQUIT, signal_handler);
      signal(SIGILL, signal_handler);
      signal(SIGTRAP, signal_handler);
      signal(SIGIOT, signal_handler);
      signal(SIGBUS, signal_handler);
      signal(SIGFPE, signal_handler);
      signal(SIGSEGV, signal_handler);
      signal(SIGTERM, signal_handler);
}

void VID_Finish (void)
{
      vid_usevsync = vid_vsync.integer && !cls.timedemo && qglXSwapIntervalSGI;
      switch(vid.renderpath)
      {
            case RENDERPATH_SOFT:
                  if(vidx11_shmevent >= 0) {
                        vidx11_ximage_pos = !vidx11_ximage_pos;
                        vid.softpixels = (unsigned int *) vidx11_ximage[vidx11_ximage_pos]->data;
                        DPSOFTRAST_SetRenderTargets(vid.width, vid.height, vid.softdepthpixels, vid.softpixels, NULL, NULL, NULL);

                        // save mouse motion so we can deal with it later
                        in_mouse_x = 0;
                        in_mouse_y = 0;
                        while(vidx11_shmwait)
                              HandleEvents();
                        in_mouse_x_save += in_mouse_x;
                        in_mouse_y_save += in_mouse_y;
                        in_mouse_x = 0;
                        in_mouse_y = 0;

                        ++vidx11_shmwait;
                        XShmPutImage(vidx11_display, win, vidx11_gc, vidx11_ximage[!vidx11_ximage_pos], 0, 0, 0, 0, vid.width, vid.height, True);
                  } else {
                        // no buffer switching here, we just flush the renderer
                        DPSOFTRAST_Finish();
                        XPutImage(vidx11_display, win, vidx11_gc, vidx11_ximage[vidx11_ximage_pos], 0, 0, 0, 0, vid.width, vid.height);
                  }
                  break;

            case RENDERPATH_GL11:
            case RENDERPATH_GL13:
            case RENDERPATH_GL20:
            case RENDERPATH_GLES1:
            case RENDERPATH_GLES2:
                  if (vid_usingvsync != vid_usevsync)
                  {
                        vid_usingvsync = vid_usevsync;
                        if (qglXSwapIntervalSGI (vid_usevsync))
                              Con_Print("glXSwapIntervalSGI didn't accept the vid_vsync change, it will take effect on next vid_restart (GLX_SGI_swap_control does not allow turning off vsync)\n");
                  }

                  if (!vid_hidden)
                  {
                        CHECKGLERROR
                        if (r_speeds.integer == 2 || gl_finish.integer)
                              GL_Finish();
                        qglXSwapBuffers(vidx11_display, win);CHECKGLERROR
                  }
                  break;

            case RENDERPATH_D3D9:
            case RENDERPATH_D3D10:
            case RENDERPATH_D3D11:
                  break;
      }

      if (vid_x11_hardwaregammasupported)
            VID_UpdateGamma(false, vid_x11_gammarampsize);
}

int VID_SetGamma(unsigned short *ramps, int rampsize)
{
      return XF86VidModeSetGammaRamp(vidx11_display, vidx11_screen, rampsize, ramps, ramps + rampsize, ramps + rampsize*2);
}

int VID_GetGamma(unsigned short *ramps, int rampsize)
{
      return XF86VidModeGetGammaRamp(vidx11_display, vidx11_screen, rampsize, ramps, ramps + rampsize, ramps + rampsize*2);
}

void VID_Init(void)
{
#if !defined(__APPLE__) && !defined(SUNOS)
      Cvar_RegisterVariable (&vid_dgamouse);
#endif
      Cvar_RegisterVariable (&vid_netwmfullscreen);
      InitSig(); // trap evil signals
// COMMANDLINEOPTION: Input: -nomouse disables mouse support (see also vid_mouse cvar)
      if (COM_CheckParm ("-nomouse"))
            mouse_avail = false;
      vidx11_shminfo[0].shmid = -1;
      vidx11_shminfo[1].shmid = -1;
}

void VID_BuildGLXAttrib(int *attrib, qboolean stencil, qboolean stereobuffer, int samples)
{
      *attrib++ = GLX_RGBA;
      *attrib++ = GLX_RED_SIZE;*attrib++ = stencil ? 8 : 5;
      *attrib++ = GLX_GREEN_SIZE;*attrib++ = stencil ? 8 : 5;
      *attrib++ = GLX_BLUE_SIZE;*attrib++ = stencil ? 8 : 5;
      *attrib++ = GLX_DOUBLEBUFFER;
      *attrib++ = GLX_DEPTH_SIZE;*attrib++ = stencil ? 24 : 16;
      // if stencil is enabled, ask for alpha too
      if (stencil)
      {
            *attrib++ = GLX_STENCIL_SIZE;*attrib++ = 8;
            *attrib++ = GLX_ALPHA_SIZE;*attrib++ = 8;
      }
      if (stereobuffer)
            *attrib++ = GLX_STEREO;
      if (samples > 1)
      {
            *attrib++ = GLX_SAMPLE_BUFFERS_ARB;
            *attrib++ = 1;
            *attrib++ = GLX_SAMPLES_ARB;
            *attrib++ = samples;
      }
      *attrib++ = None;
}

qboolean VID_InitModeSoft(viddef_mode_t *mode)
{
      int i, j;
      XSetWindowAttributes attr;
      XClassHint *clshints;
      XWMHints *wmhints;
      XSizeHints *szhints;
      unsigned long mask;
      int MajorVersion, MinorVersion;
      char *xpm;
      char **idata;
      unsigned char *data;
      XGCValues gcval;
      const char *dpyname;

      vid_isfullscreen = false;
      vid_isnetwmfullscreen = false;
      vid_isvidmodefullscreen = false;
      vid_isoverrideredirect = false;

      if (!(vidx11_display = XOpenDisplay(NULL)))
      {
            Con_Print("Couldn't open the X display\n");
            return false;
      }
      dpyname = XDisplayName(NULL);

      // LordHavoc: making the close button on a window do the right thing
      // seems to involve this mess, sigh...
      wm_delete_window_atom = XInternAtom(vidx11_display, "WM_DELETE_WINDOW", false);
      net_wm_state_atom = XInternAtom(vidx11_display, "_NET_WM_STATE", false);
      net_wm_state_fullscreen_atom = XInternAtom(vidx11_display, "_NET_WM_STATE_FULLSCREEN", false);
      net_wm_state_hidden_atom = XInternAtom(vidx11_display, "_NET_WM_STATE_HIDDEN", false);
      net_wm_icon = XInternAtom(vidx11_display, "_NET_WM_ICON", false);
      cardinal = XInternAtom(vidx11_display, "CARDINAL", false);

      // make autorepeat send keypress/keypress/.../keyrelease instead of intervening keyrelease
      XkbSetDetectableAutoRepeat(vidx11_display, true, NULL);

      vidx11_screen = DefaultScreen(vidx11_display);
      root = RootWindow(vidx11_display, vidx11_screen);

      // Get video mode list
      MajorVersion = MinorVersion = 0;
      if (!XF86VidModeQueryVersion(vidx11_display, &MajorVersion, &MinorVersion))
            vidmode_ext = false;
      else
      {
            Con_DPrintf("Using XFree86-VidModeExtension Version %d.%d\n", MajorVersion, MinorVersion);
            vidmode_ext = true;
      }

      if (mode->fullscreen)
      {
            if(vid_netwmfullscreen.integer)
            {
                  // TODO detect WM support
                  vid_isnetwmfullscreen = true;
                  vid_isfullscreen = true;
                  // width and height will be filled in later
                  Con_DPrintf("Using NetWM fullscreen mode\n");
            }

            if(!vid_isfullscreen && vidmode_ext)
            {
                  int best_fit, best_dist, dist, x, y;

                  // Are we going fullscreen?  If so, let's change video mode
                  XF86VidModeModeLine *current_vidmode;
                  XF86VidModeModeInfo **vidmodes;
                  int num_vidmodes;

                  // This nice hack comes from the SDL source code
                  current_vidmode = (XF86VidModeModeLine*)((char*)&init_vidmode + sizeof(init_vidmode.dotclock));
                  XF86VidModeGetModeLine(vidx11_display, vidx11_screen, (int*)&init_vidmode.dotclock, current_vidmode);

                  XF86VidModeGetAllModeLines(vidx11_display, vidx11_screen, &num_vidmodes, &vidmodes);
                  best_dist = 0;
                  best_fit = -1;

                  for (i = 0; i < num_vidmodes; i++)
                  {
                        if (mode->width > vidmodes[i]->hdisplay || mode->height > vidmodes[i]->vdisplay)
                              continue;

                        x = mode->width - vidmodes[i]->hdisplay;
                        y = mode->height - vidmodes[i]->vdisplay;
                        dist = (x * x) + (y * y);
                        if (best_fit == -1 || dist < best_dist)
                        {
                              best_dist = dist;
                              best_fit = i;
                        }
                  }

                  if (best_fit != -1)
                  {
                        // LordHavoc: changed from ActualWidth/ActualHeight =,
                        // to width/height =, so the window will take the full area of
                        // the mode chosen
                        mode->width = vidmodes[best_fit]->hdisplay;
                        mode->height = vidmodes[best_fit]->vdisplay;

                        // change to the mode
                        XF86VidModeSwitchToMode(vidx11_display, vidx11_screen, vidmodes[best_fit]);
                        memcpy(&game_vidmode, vidmodes[best_fit], sizeof(game_vidmode));
                        vid_isvidmodefullscreen = true;
                        vid_isfullscreen = true;

                        // Move the viewport to top left
                        XF86VidModeSetViewPort(vidx11_display, vidx11_screen, 0, 0);
                        Con_DPrintf("Using XVidMode fullscreen mode at %dx%d\n", mode->width, mode->height);
                  }

                  free(vidmodes);
            }

            if(!vid_isfullscreen)
            {
                  // sorry, no FS available
                  // use the full desktop resolution
                  vid_isfullscreen = true;
                  // width and height will be filled in later
                  mode->width = DisplayWidth(vidx11_display, vidx11_screen);
                  mode->height = DisplayHeight(vidx11_display, vidx11_screen);
                  Con_DPrintf("Using X11 fullscreen mode at %dx%d\n", mode->width, mode->height);
            }
      }

      // LordHavoc: save the visual for use in gamma ramp settings later
      vidx11_visual = DefaultVisual(vidx11_display, vidx11_screen);

      /* window attributes */
      attr.background_pixel = 0;
      attr.border_pixel = 0;
      // LordHavoc: save the colormap for later, too
      vidx11_colormap = attr.colormap = XCreateColormap(vidx11_display, root, vidx11_visual, AllocNone);
      attr.event_mask = X_MASK;

      if (mode->fullscreen)
      {
            if(vid_isnetwmfullscreen)
            {
                  mask = CWBackPixel | CWColormap | CWSaveUnder | CWBackingStore | CWEventMask;
                  attr.backing_store = NotUseful;
                  attr.save_under = False;
            }
            else
            {
                  mask = CWBackPixel | CWColormap | CWSaveUnder | CWBackingStore | CWEventMask | CWOverrideRedirect;
                  attr.override_redirect = True;
                  attr.backing_store = NotUseful;
                  attr.save_under = False;
                  vid_isoverrideredirect = true; // so it knows to grab
            }
      }
      else
      {
            mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
      }

      win = XCreateWindow(vidx11_display, root, 0, 0, mode->width, mode->height, 0, CopyFromParent, InputOutput, vidx11_visual, mask, &attr);

      data = loadimagepixelsbgra("darkplaces-icon", false, false, false, NULL);
      if(data)
      {
            // use _NET_WM_ICON too
            static long netwm_icon[MAX_NETWM_ICON];
            int pos = 0;
            int i = 1;

            while(data)
            {
                  if(pos + 2 * image_width * image_height < MAX_NETWM_ICON)
                  {
                        netwm_icon[pos++] = image_width;
                        netwm_icon[pos++] = image_height;
                        for(i = 0; i < image_height; ++i)
                              for(j = 0; j < image_width; ++j)
                                    netwm_icon[pos++] = BuffLittleLong(&data[(i*image_width+j)*4]);
                  }
                  else
                  {
                        Con_Printf("Skipping NETWM icon #%d because there is no space left\n", i);
                  }
                  ++i;
                  Mem_Free(data);
                  data = loadimagepixelsbgra(va("darkplaces-icon%d", i), false, false, false, NULL);
            }
            XChangeProperty(vidx11_display, win, net_wm_icon, cardinal, 32, PropModeReplace, (const unsigned char *) netwm_icon, pos);
      }

      // fallthrough for old window managers
      xpm = (char *) FS_LoadFile("darkplaces-icon.xpm", tempmempool, false, NULL);
      idata = NULL;
      if(xpm)
            idata = XPM_DecodeString(xpm);
      if(!idata)
            idata = ENGINE_ICON;

      wmhints = XAllocWMHints();
      if(XpmCreatePixmapFromData(vidx11_display, win,
            idata,
            &wmhints->icon_pixmap, &wmhints->icon_mask, NULL) == XpmSuccess)
            wmhints->flags |= IconPixmapHint | IconMaskHint;

      if(xpm)
            Mem_Free(xpm);

      clshints = XAllocClassHint();
      clshints->res_name = strdup(gamename);
      clshints->res_class = strdup("DarkPlaces");

      szhints = XAllocSizeHints();
      if(vid_resizable.integer == 0 && !vid_isnetwmfullscreen)
      {
            szhints->min_width = szhints->max_width = mode->width;
            szhints->min_height = szhints->max_height = mode->height;
            szhints->flags |= PMinSize | PMaxSize;
      }

      XmbSetWMProperties(vidx11_display, win, gamename, gamename, (char **) com_argv, com_argc, szhints, wmhints, clshints);
      // strdup() allocates using malloc(), should be freed with free()
      free(clshints->res_name);
      free(clshints->res_class);
      XFree(clshints);
      XFree(wmhints);
      XFree(szhints);

      //XStoreName(vidx11_display, win, gamename);
      XMapWindow(vidx11_display, win);

      XSetWMProtocols(vidx11_display, win, &wm_delete_window_atom, 1);

      if (vid_isoverrideredirect)
      {
            XMoveWindow(vidx11_display, win, 0, 0);
            XRaiseWindow(vidx11_display, win);
            XWarpPointer(vidx11_display, None, win, 0, 0, 0, 0, 0, 0);
            XFlush(vidx11_display);
      }

      if(vid_isvidmodefullscreen)
      {
            // Move the viewport to top left
            XF86VidModeSetViewPort(vidx11_display, vidx11_screen, 0, 0);
      }

      //XSync(vidx11_display, False);

      // COMMANDLINEOPTION: Unix GLX: -noshm disables XShm extensioon
      if(dpyname && dpyname[0] == ':' && dpyname[1] && (dpyname[2] < '0' || dpyname[2] > '9') && !COM_CheckParm("-noshm") && XShmQueryExtension(vidx11_display))
      {
            Con_Printf("Using XShm\n");
            vidx11_shmevent = XShmGetEventBase(vidx11_display) + ShmCompletion;
      }
      else
      {
            Con_Printf("Not using XShm\n");
            vidx11_shmevent = -1;
      }
      BuildXImages(mode->width, mode->height);

      vidx11_ximage_pos = 0;
      vid.softpixels = (unsigned int *) vidx11_ximage[vidx11_ximage_pos]->data;
      vidx11_shmwait = 0;
      vid.softdepthpixels = (unsigned int *)calloc(1, mode->width * mode->height * 4);

      memset(&gcval, 0, sizeof(gcval));
      vidx11_gc = XCreateGC(vidx11_display, win, 0, &gcval);

      if (DPSOFTRAST_Init(mode->width, mode->height, vid_soft_threads.integer, vid_soft_interlace.integer, (unsigned int *)vid.softpixels, (unsigned int *)vid.softdepthpixels) < 0)
      {
            Con_Printf("Failed to initialize software rasterizer\n");
            VID_Shutdown();
            return false;
      }

      XSync(vidx11_display, False);

      vid_usingmousegrab = false;
      vid_usingmouse = false;
      vid_usinghidecursor = false;
      vid_usingvsync = false;
      vid_hidden = false;
      vid_activewindow = true;
      vid_x11_hardwaregammasupported = XF86VidModeGetGammaRampSize(vidx11_display, vidx11_screen, &vid_x11_gammarampsize) != 0;
#if !defined(__APPLE__) && !defined(SUNOS)
      vid_x11_dgasupported = XF86DGAQueryVersion(vidx11_display, &MajorVersion, &MinorVersion);
      if (!vid_x11_dgasupported)
            Con_Print( "Failed to detect XF86DGA Mouse extension\n" );
#endif

      VID_Soft_SharedSetup();

      return true;
}
qboolean VID_InitModeGL(viddef_mode_t *mode)
{
      int i, j;
      int attrib[32];
      XSetWindowAttributes attr;
      XClassHint *clshints;
      XWMHints *wmhints;
      XSizeHints *szhints;
      unsigned long mask;
      XVisualInfo *visinfo;
      int MajorVersion, MinorVersion;
      const char *drivername;
      char *xpm;
      char **idata;
      unsigned char *data;

      vid_isfullscreen = false;
      vid_isnetwmfullscreen = false;
      vid_isvidmodefullscreen = false;
      vid_isoverrideredirect = false;

#if defined(__APPLE__) && defined(__MACH__)
      drivername = "/usr/X11R6/lib/libGL.1.dylib";
#else
      drivername = "libGL.so.1";
#endif
// COMMANDLINEOPTION: Linux GLX: -gl_driver <drivername> selects a GL driver library, default is libGL.so.1, useful only for using fxmesa or similar, if you don't know what this is for, you don't need it
// COMMANDLINEOPTION: BSD GLX: -gl_driver <drivername> selects a GL driver library, default is libGL.so.1, useful only for using fxmesa or similar, if you don't know what this is for, you don't need it
// LordHavoc: although this works on MacOSX, it's useless there (as there is only one system libGL)
      i = COM_CheckParm("-gl_driver");
      if (i && i < com_argc - 1)
            drivername = com_argv[i + 1];
      if (!GL_OpenLibrary(drivername))
      {
            Con_Printf("Unable to load GL driver \"%s\"\n", drivername);
            return false;
      }

      if (!(vidx11_display = XOpenDisplay(NULL)))
      {
            Con_Print("Couldn't open the X display\n");
            return false;
      }

      // LordHavoc: making the close button on a window do the right thing
      // seems to involve this mess, sigh...
      wm_delete_window_atom = XInternAtom(vidx11_display, "WM_DELETE_WINDOW", false);
      net_wm_state_atom = XInternAtom(vidx11_display, "_NET_WM_STATE", false);
      net_wm_state_fullscreen_atom = XInternAtom(vidx11_display, "_NET_WM_STATE_FULLSCREEN", false);
      net_wm_state_hidden_atom = XInternAtom(vidx11_display, "_NET_WM_STATE_HIDDEN", false);
      net_wm_icon = XInternAtom(vidx11_display, "_NET_WM_ICON", false);
      cardinal = XInternAtom(vidx11_display, "CARDINAL", false);

      // make autorepeat send keypress/keypress/.../keyrelease instead of intervening keyrelease
      XkbSetDetectableAutoRepeat(vidx11_display, true, NULL);

      vidx11_screen = DefaultScreen(vidx11_display);
      root = RootWindow(vidx11_display, vidx11_screen);

      // Get video mode list
      MajorVersion = MinorVersion = 0;
      if (!XF86VidModeQueryVersion(vidx11_display, &MajorVersion, &MinorVersion))
            vidmode_ext = false;
      else
      {
            Con_DPrintf("Using XFree86-VidModeExtension Version %d.%d\n", MajorVersion, MinorVersion);
            vidmode_ext = true;
      }

      if ((qglXChooseVisual = (XVisualInfo *(GLAPIENTRY *)(Display *dpy, int screen, int *attribList))GL_GetProcAddress("glXChooseVisual")) == NULL
       || (qglXCreateContext = (GLXContext (GLAPIENTRY *)(Display *dpy, XVisualInfo *vis, GLXContext shareList, Bool direct))GL_GetProcAddress("glXCreateContext")) == NULL
       || (qglXDestroyContext = (void (GLAPIENTRY *)(Display *dpy, GLXContext ctx))GL_GetProcAddress("glXDestroyContext")) == NULL
       || (qglXMakeCurrent = (Bool (GLAPIENTRY *)(Display *dpy, GLXDrawable drawable, GLXContext ctx))GL_GetProcAddress("glXMakeCurrent")) == NULL
       || (qglXSwapBuffers = (void (GLAPIENTRY *)(Display *dpy, GLXDrawable drawable))GL_GetProcAddress("glXSwapBuffers")) == NULL
       || (qglXQueryExtensionsString = (const char *(GLAPIENTRY *)(Display *dpy, int screen))GL_GetProcAddress("glXQueryExtensionsString")) == NULL)
      {
            Con_Printf("glX functions not found in %s\n", gl_driver);
            return false;
      }

      VID_BuildGLXAttrib(attrib, mode->bitsperpixel == 32, mode->stereobuffer, mode->samples);
      visinfo = qglXChooseVisual(vidx11_display, vidx11_screen, attrib);
      if (!visinfo)
      {
            Con_Print("Couldn't get an RGB, Double-buffered, Depth visual\n");
            return false;
      }

      if (mode->fullscreen)
      {
            if(vid_netwmfullscreen.integer)
            {
                  // TODO detect WM support
                  vid_isnetwmfullscreen = true;
                  vid_isfullscreen = true;
                  // width and height will be filled in later
                  Con_DPrintf("Using NetWM fullscreen mode\n");
            }

            if(!vid_isfullscreen && vidmode_ext)
            {
                  int best_fit, best_dist, dist, x, y;

                  // Are we going fullscreen?  If so, let's change video mode
                  XF86VidModeModeLine *current_vidmode;
                  XF86VidModeModeInfo **vidmodes;
                  int num_vidmodes;

                  // This nice hack comes from the SDL source code
                  current_vidmode = (XF86VidModeModeLine*)((char*)&init_vidmode + sizeof(init_vidmode.dotclock));
                  XF86VidModeGetModeLine(vidx11_display, vidx11_screen, (int*)&init_vidmode.dotclock, current_vidmode);

                  XF86VidModeGetAllModeLines(vidx11_display, vidx11_screen, &num_vidmodes, &vidmodes);
                  best_dist = 0;
                  best_fit = -1;

                  for (i = 0; i < num_vidmodes; i++)
                  {
                        if (mode->width > vidmodes[i]->hdisplay || mode->height > vidmodes[i]->vdisplay)
                              continue;

                        x = mode->width - vidmodes[i]->hdisplay;
                        y = mode->height - vidmodes[i]->vdisplay;
                        dist = (x * x) + (y * y);
                        if (best_fit == -1 || dist < best_dist)
                        {
                              best_dist = dist;
                              best_fit = i;
                        }
                  }

                  if (best_fit != -1)
                  {
                        // LordHavoc: changed from ActualWidth/ActualHeight =,
                        // to width/height =, so the window will take the full area of
                        // the mode chosen
                        mode->width = vidmodes[best_fit]->hdisplay;
                        mode->height = vidmodes[best_fit]->vdisplay;

                        // change to the mode
                        XF86VidModeSwitchToMode(vidx11_display, vidx11_screen, vidmodes[best_fit]);
                        memcpy(&game_vidmode, vidmodes[best_fit], sizeof(game_vidmode));
                        vid_isvidmodefullscreen = true;
                        vid_isfullscreen = true;

                        // Move the viewport to top left
                        XF86VidModeSetViewPort(vidx11_display, vidx11_screen, 0, 0);
                        Con_DPrintf("Using XVidMode fullscreen mode at %dx%d\n", mode->width, mode->height);
                  }

                  free(vidmodes);
            }

            if(!vid_isfullscreen)
            {
                  // sorry, no FS available
                  // use the full desktop resolution
                  vid_isfullscreen = true;
                  // width and height will be filled in later
                  mode->width = DisplayWidth(vidx11_display, vidx11_screen);
                  mode->height = DisplayHeight(vidx11_display, vidx11_screen);
                  Con_DPrintf("Using X11 fullscreen mode at %dx%d\n", mode->width, mode->height);
            }
      }

      // LordHavoc: save the visual for use in gamma ramp settings later
      vidx11_visual = visinfo->visual;

      /* window attributes */
      attr.background_pixel = 0;
      attr.border_pixel = 0;
      // LordHavoc: save the colormap for later, too
      vidx11_colormap = attr.colormap = XCreateColormap(vidx11_display, root, visinfo->visual, AllocNone);
      attr.event_mask = X_MASK;

      if (mode->fullscreen)
      {
            if(vid_isnetwmfullscreen)
            {
                  mask = CWBackPixel | CWColormap | CWSaveUnder | CWBackingStore | CWEventMask;
                  attr.backing_store = NotUseful;
                  attr.save_under = False;
            }
            else
            {
                  mask = CWBackPixel | CWColormap | CWSaveUnder | CWBackingStore | CWEventMask | CWOverrideRedirect;
                  attr.override_redirect = True;
                  attr.backing_store = NotUseful;
                  attr.save_under = False;
                  vid_isoverrideredirect = true; // so it knows to grab
            }
      }
      else
      {
            mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
      }

      win = XCreateWindow(vidx11_display, root, 0, 0, mode->width, mode->height, 0, visinfo->depth, InputOutput, visinfo->visual, mask, &attr);

      data = loadimagepixelsbgra("darkplaces-icon", false, false, false, NULL);
      if(data)
      {
            // use _NET_WM_ICON too
            static long netwm_icon[MAX_NETWM_ICON];
            int pos = 0;
            int i = 1;

            while(data)
            {
                  if(pos + 2 * image_width * image_height < MAX_NETWM_ICON)
                  {
                        netwm_icon[pos++] = image_width;
                        netwm_icon[pos++] = image_height;
                        for(i = 0; i < image_height; ++i)
                              for(j = 0; j < image_width; ++j)
                                    netwm_icon[pos++] = BuffLittleLong(&data[(i*image_width+j)*4]);
                  }
                  else
                  {
                        Con_Printf("Skipping NETWM icon #%d because there is no space left\n", i);
                  }
                  ++i;
                  Mem_Free(data);
                  data = loadimagepixelsbgra(va("darkplaces-icon%d", i), false, false, false, NULL);
            }
            XChangeProperty(vidx11_display, win, net_wm_icon, cardinal, 32, PropModeReplace, (const unsigned char *) netwm_icon, pos);
      }

      // fallthrough for old window managers
      xpm = (char *) FS_LoadFile("darkplaces-icon.xpm", tempmempool, false, NULL);
      idata = NULL;
      if(xpm)
            idata = XPM_DecodeString(xpm);
      if(!idata)
            idata = ENGINE_ICON;

      wmhints = XAllocWMHints();
      if(XpmCreatePixmapFromData(vidx11_display, win,
            idata,
            &wmhints->icon_pixmap, &wmhints->icon_mask, NULL) == XpmSuccess)
            wmhints->flags |= IconPixmapHint | IconMaskHint;

      if(xpm)
            Mem_Free(xpm);

      clshints = XAllocClassHint();
      clshints->res_name = strdup(gamename);
      clshints->res_class = strdup("DarkPlaces");

      szhints = XAllocSizeHints();
      if(vid_resizable.integer == 0 && !vid_isnetwmfullscreen)
      {
            szhints->min_width = szhints->max_width = mode->width;
            szhints->min_height = szhints->max_height = mode->height;
            szhints->flags |= PMinSize | PMaxSize;
      }

      XmbSetWMProperties(vidx11_display, win, gamename, gamename, (char **) com_argv, com_argc, szhints, wmhints, clshints);
      // strdup() allocates using malloc(), should be freed with free()
      free(clshints->res_name);
      free(clshints->res_class);
      XFree(clshints);
      XFree(wmhints);
      XFree(szhints);

      //XStoreName(vidx11_display, win, gamename);
      XMapWindow(vidx11_display, win);

      XSetWMProtocols(vidx11_display, win, &wm_delete_window_atom, 1);

      if (vid_isoverrideredirect)
      {
            XMoveWindow(vidx11_display, win, 0, 0);
            XRaiseWindow(vidx11_display, win);
            XWarpPointer(vidx11_display, None, win, 0, 0, 0, 0, 0, 0);
            XFlush(vidx11_display);
      }

      if(vid_isvidmodefullscreen)
      {
            // Move the viewport to top left
            XF86VidModeSetViewPort(vidx11_display, vidx11_screen, 0, 0);
      }

      //XSync(vidx11_display, False);

      ctx = qglXCreateContext(vidx11_display, visinfo, NULL, True);
      XFree(visinfo); // glXChooseVisual man page says to use XFree to free visinfo
      if (!ctx)
      {
            Con_Printf ("glXCreateContext failed\n");
            return false;
      }

      if (!qglXMakeCurrent(vidx11_display, win, ctx))
      {
            Con_Printf ("glXMakeCurrent failed\n");
            return false;
      }

      XSync(vidx11_display, False);

      if ((qglGetString = (const GLubyte* (GLAPIENTRY *)(GLenum name))GL_GetProcAddress("glGetString")) == NULL)
      {
            Con_Printf ("glGetString not found in %s\n", gl_driver);
            return false;
      }

      gl_extensions = (const char *)qglGetString(GL_EXTENSIONS);
      gl_platform = "GLX";
      gl_platformextensions = qglXQueryExtensionsString(vidx11_display, vidx11_screen);

// COMMANDLINEOPTION: Linux GLX: -nogetprocaddress disables GLX_ARB_get_proc_address (not required, more formal method of getting extension functions)
// COMMANDLINEOPTION: BSD GLX: -nogetprocaddress disables GLX_ARB_get_proc_address (not required, more formal method of getting extension functions)
// COMMANDLINEOPTION: MacOSX GLX: -nogetprocaddress disables GLX_ARB_get_proc_address (not required, more formal method of getting extension functions)
      GL_CheckExtension("GLX_ARB_get_proc_address", getprocaddressfuncs, "-nogetprocaddress", false);
// COMMANDLINEOPTION: Linux GLX: -novideosync disables GLX_SGI_swap_control
// COMMANDLINEOPTION: BSD GLX: -novideosync disables GLX_SGI_swap_control
// COMMANDLINEOPTION: MacOSX GLX: -novideosync disables GLX_SGI_swap_control
      GL_CheckExtension("GLX_SGI_swap_control", swapcontrolfuncs, "-novideosync", false);

      vid_usingmousegrab = false;
      vid_usingmouse = false;
      vid_usinghidecursor = false;
      vid_usingvsync = false;
      vid_hidden = false;
      vid_activewindow = true;
      vid_x11_hardwaregammasupported = XF86VidModeGetGammaRampSize(vidx11_display, vidx11_screen, &vid_x11_gammarampsize) != 0;
#if !defined(__APPLE__) && !defined(SUNOS)
      vid_x11_dgasupported = XF86DGAQueryVersion(vidx11_display, &MajorVersion, &MinorVersion);
      if (!vid_x11_dgasupported)
            Con_Print( "Failed to detect XF86DGA Mouse extension\n" );
#endif

      GL_Init();
      return true;
}

qboolean VID_InitMode(viddef_mode_t *mode)
{
#ifdef SSE_POSSIBLE
      if (vid_soft.integer)
            return VID_InitModeSoft(mode);
      else
#endif
            return VID_InitModeGL(mode);
}

void Sys_SendKeyEvents(void)
{
      static qboolean sound_active = true;

      // enable/disable sound on focus gain/loss
      if ((!vid_hidden && vid_activewindow) || !snd_mutewhenidle.integer)
      {
            if (!sound_active)
            {
                  S_UnblockSound ();
                  sound_active = true;
            }
      }
      else
      {
            if (sound_active)
            {
                  S_BlockSound ();
                  sound_active = false;
            }
      }

      HandleEvents();
}

void VID_BuildJoyState(vid_joystate_t *joystate)
{
      VID_Shared_BuildJoyState_Begin(joystate);
      VID_Shared_BuildJoyState_Finish(joystate);
}

void VID_EnableJoystick(qboolean enable)
{
      int index = joy_enable.integer > 0 ? joy_index.integer : -1;
      qboolean success = false;
      int sharedcount = 0;
      sharedcount = VID_Shared_SetJoystick(index);
      if (index >= 0 && index < sharedcount)
            success = true;

      // update cvar containing count of XInput joysticks
      if (joy_detected.integer != sharedcount)
            Cvar_SetValueQuick(&joy_detected, sharedcount);

      Cvar_SetValueQuick(&joy_active, success ? 1 : 0);
}

void IN_Move (void)
{
      vid_joystate_t joystate;
      VID_EnableJoystick(true);
      VID_BuildJoyState(&joystate);
      VID_ApplyJoyState(&joystate);
}

size_t VID_ListModes(vid_mode_t *modes, size_t maxcount)
{
      if(vidmode_ext)
      {
            int i, bpp;
            size_t k;
            XF86VidModeModeInfo **vidmodes;
            int num_vidmodes;

            XF86VidModeGetAllModeLines(vidx11_display, vidx11_screen, &num_vidmodes, &vidmodes);
            k = 0;
            for (i = 0; i < num_vidmodes; i++)
            {
                  if(k >= maxcount)
                        break;
                  // we don't get bpp info, so let's just assume all of 8, 15, 16, 24, 32 work
                  for(bpp = 8; bpp <= 32; bpp = ((bpp == 8) ? 15 : (bpp & 0xF8) + 8))
                  {
                        if(k >= maxcount)
                              break;
                        modes[k].width = vidmodes[i]->hdisplay;
                        modes[k].height = vidmodes[i]->vdisplay;
                        modes[k].bpp = 8;
                        if(vidmodes[i]->dotclock && vidmodes[i]->htotal && vidmodes[i]->vtotal)
                              modes[k].refreshrate = vidmodes[i]->dotclock / vidmodes[i]->htotal / vidmodes[i]->vtotal;
                        else
                              modes[k].refreshrate = 60;
                        modes[k].pixelheight_num = 1;
                        modes[k].pixelheight_denom = 1; // xvidmode does not provide this
                        ++k;
                  }
            }
            // manpage of XF86VidModeGetAllModeLines says it should be freed by the caller
            XFree(vidmodes);
            return k;
      }
      return 0; // FIXME implement this
}

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