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glxgears: Log a message if synched to vblank 

Tries to use either GLX_MESA_swap_control or GLX_SGI_video_sync to
detect whether the display is synchronized to the vertical blank.  If
it detects this, a message will be printed.  HOPEFULLY this will
prevent some of the bug reports such as "glxgears only gets 59.7fps.
What's wrong with my driver?"
This commit is contained in:
Ian Romanick 2009-01-30 14:43:03 -08:00
parent 7c48719a5f
commit 58b9cd411f
1 changed files with 74 additions and 0 deletions
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74
progs/xdemos/glxgears.c
View File

@ -39,6 +39,9 @@
#include <GL/gl.h>
#include <GL/glx.h>
static int is_glx_extension_supported(Display *dpy, const char *query);
static void query_vsync(Display *dpy);
#define BENCHMARK
@ -560,6 +563,73 @@ make_window( Display *dpy, const char *name,
}
/**
* Determine whether or not a GLX extension is supported.
*/
int
is_glx_extension_supported(Display *dpy, const char *query)
{
const int scrnum = DefaultScreen(dpy);
const char *glx_extensions = NULL;
const size_t len = strlen(query);
const char *ptr;
if (glx_extensions == NULL) {
glx_extensions = glXQueryExtensionsString(dpy, scrnum);
}
ptr = strstr(glx_extensions, query);
return ((ptr != NULL) && ((ptr[len] == ' ') || (ptr[len] == '\0')));
}
/**
* Attempt to determine whether or not the display is synched to vblank.
*/
void
query_vsync(Display *dpy)
{
int interval = 0;
#ifdef GLX_MESA_swap_control
if ((interval <= 0)
&& is_glx_extension_supported(dpy, "GLX_MESA_swap_control")) {
PFNGLXGETSWAPINTERVALMESAPROC pglXGetSwapIntervalMESA =
(PFNGLXGETSWAPINTERVALMESAPROC)
glXGetProcAddressARB((const GLubyte *) "glXGetSwapIntervalMESA");
interval = (*pglXGetSwapIntervalMESA)();
}
#endif
#ifdef GLX_SGI_video_sync
if ((interval <= 0)
&& is_glx_extension_supported(dpy, "GLX_SGI_video_sync")) {
PFNGLXGETVIDEOSYNCSGIPROC pglXGetVideoSyncSGI =
(PFNGLXGETVIDEOSYNCSGIPROC)
glXGetProcAddressARB((const GLubyte *) "glXGetVideoSyncSGI");
unsigned count;
if ((*pglXGetVideoSyncSGI)(& count) == 0) {
interval = (int) count;
}
}
#endif
if (interval > 0) {
printf("Running synchronized to the vertical refresh. The framerate should be\n");
if (interval == 1) {
printf("approximately the same as the montior refresh rate.\n");
} else if (interval > 1) {
printf("approximately 1/%d the montior refresh rate.\n",
interval);
}
}
}
/**
* Handle one X event.
* \return NOP, EXIT or DRAW
@ -567,6 +637,9 @@ make_window( Display *dpy, const char *name,
static int
handle_event(Display *dpy, Window win, XEvent *event)
{
(void) dpy;
(void) win;
switch (event->type) {
case Expose:
return DRAW;
@ -686,6 +759,7 @@ main(int argc, char *argv[])
make_window(dpy, "glxgears", x, y, winWidth, winHeight, &win, &ctx);
XMapWindow(dpy, win);
glXMakeCurrent(dpy, win, ctx);
query_vsync(dpy);
if (printInfo) {
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));