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/*
Copyright (C) 2003-2012 Andrey Nazarov
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
//
// glx.c -- support for GLX extensions
//
#include "video.h"
#include <SDL_syswm.h>
#include <GL/glx.h>
#include <GL/glxext.h>
#define QGLX_EXT_swap_control (1<<0)
#define QGLX_EXT_swap_control_tear (1<<1)
#define QGLX_SGI_video_sync (1<<2)
// for debugging
#define SHOW_SYNC() \
Com_DDDDPrintf("%s: %u\n", __func__, glx_sync_count)
static const char *(*qglXQueryExtensionsString)(Display *, int);
static GLXDrawable (*qglXGetCurrentDrawable)(void);
static int (*qglXSwapIntervalEXT)(Display *, GLXDrawable, int);
static int (*qglXGetVideoSyncSGI)(unsigned int *);
static int (*qglXWaitVideoSyncSGI)(int, int, unsigned int *);
static Display *glx_dpy;
static unsigned glx_extensions;
static unsigned glx_sync_count;
static cvar_t *gl_swapinterval;
static cvar_t *gl_video_sync;
static unsigned GLX_ParseExtensionString(const char *s)
{
static const char *const extnames[] = {
"GLX_EXT_swap_control",
"GLX_EXT_swap_control_tear",
"GLX_SGI_video_sync",
NULL
};
return Com_ParseExtensionString(s, extnames);
}
static void gl_swapinterval_changed(cvar_t *self)
{
int drawable;
if (!qglXSwapIntervalEXT)
return;
if (!qglXGetCurrentDrawable)
return;
drawable = qglXGetCurrentDrawable();
if (!drawable)
return;
if (self->integer < 0 && !(glx_extensions & QGLX_EXT_swap_control_tear)) {
Com_Printf("Negative swap interval is not supported on this system.\n");
Cvar_Reset(self);
}
qglXSwapIntervalEXT(glx_dpy, drawable, self->integer);
}
void VID_GLX_SurfaceChanged(void)
{
SDL_SysWMinfo info;
const char *extensions;
SDL_VERSION(&info.version);
if (!SDL_GetWMInfo(&info))
return;
if (info.subsystem != SDL_SYSWM_X11)
return;
glx_dpy = info.info.x11.display;
if (!glx_dpy)
return;
gl_swapinterval = Cvar_Get("gl_swapinterval", "1", CVAR_ARCHIVE);
gl_video_sync = Cvar_Get("gl_video_sync", "1", CVAR_REFRESH);
qglXQueryExtensionsString = SDL_GL_GetProcAddress("glXQueryExtensionsString");
qglXGetCurrentDrawable = SDL_GL_GetProcAddress("glXGetCurrentDrawable");
if (qglXQueryExtensionsString)
extensions = qglXQueryExtensionsString(glx_dpy, DefaultScreen(glx_dpy));
else
extensions = NULL;
glx_extensions = GLX_ParseExtensionString(extensions);
if (glx_extensions & QGLX_EXT_swap_control) {
if (glx_extensions & QGLX_EXT_swap_control_tear)
Com_Printf("...enabling GLX_EXT_swap_control(_tear)\n");
else
Com_Printf("...enabling GLX_EXT_swap_control\n");
qglXSwapIntervalEXT = SDL_GL_GetProcAddress("glXSwapIntervalEXT");
gl_swapinterval->changed = gl_swapinterval_changed;
gl_swapinterval_changed(gl_swapinterval);
} else {
Com_Printf("GLX_EXT_swap_control not found\n");
Cvar_Set("gl_swapinterval", "0");
}
if (glx_extensions & QGLX_SGI_video_sync) {
if (gl_video_sync->integer) {
Com_Printf("...enabling GLX_SGI_video_sync\n");
qglXGetVideoSyncSGI = SDL_GL_GetProcAddress("glXGetVideoSyncSGI");
qglXWaitVideoSyncSGI = SDL_GL_GetProcAddress("glXWaitVideoSyncSGI");
if (qglXGetVideoSyncSGI) {
qglXGetVideoSyncSGI(&glx_sync_count);
SHOW_SYNC();
sdl.flags |= QVF_VIDEOSYNC;
}
} else {
Com_Printf("...ignoring GLX_SGI_video_sync\n");
}
} else if (gl_video_sync->integer) {
Com_Printf("GLX_SGI_video_sync not found\n");
Cvar_Set("gl_video_sync", "0");
}
}
void VID_Shutdown(void)
{
glx_dpy = NULL;
glx_extensions = 0;
glx_sync_count = 0;
if (gl_swapinterval)
gl_swapinterval->changed = NULL;
qglXQueryExtensionsString = NULL;
qglXGetCurrentDrawable = NULL;
qglXSwapIntervalEXT = NULL;
qglXGetVideoSyncSGI = NULL;
qglXWaitVideoSyncSGI = NULL;
VID_SDL_Shutdown();
}
void VID_VideoWait(void)
{
if (!qglXGetVideoSyncSGI)
return;
if (!qglXWaitVideoSyncSGI)
return;
// work around glXWaitVideoSyncSGI blocking indefinitely if vsync is enabled
if (gl_swapinterval->integer)
qglXGetVideoSyncSGI(&glx_sync_count);
else
qglXWaitVideoSyncSGI(1, 0, &glx_sync_count);
SHOW_SYNC();
}
qboolean VID_VideoSync(void)
{
unsigned count;
if (!qglXGetVideoSyncSGI)
return qtrue;
if (qglXGetVideoSyncSGI(&count))
return qtrue;
if (count != glx_sync_count) {
glx_sync_count = count;
SHOW_SYNC();
return qtrue;
}
return qfalse;
}
void VID_BeginFrame(void)
{
}
void VID_EndFrame(void)
{
SDL_GL_SwapBuffers();
if (qglXGetVideoSyncSGI) {
qglXGetVideoSyncSGI(&glx_sync_count);
SHOW_SYNC();
}
}
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