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glxgears: Log a message if synched to vblank

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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?"
(cherry picked from commit 58b9cd411f)
This commit is contained in:
Ian Romanick 2009-01-30 14:43:03 -08:00
parent 42ce790086
commit 9556d870a1
1 changed files with 74 additions and 0 deletions
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74
progs/xdemos/glxgears.c
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@ -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));