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backend-glx: only check for GLX_SGI_video_sync for direct contexts

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The GLX_SGI_video_sync spec explicitly says that it's only supported for
direct contexts so we don't setup up the function pointers if
glXIsDirect () returns GL_FALSE.
This commit is contained in:
Robert Bragg 2010-06-03 23:12:08 +01:00
parent f37de23dec
commit 1b31ac465d
1 changed files with 5 additions and 1 deletions
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6
clutter/glx/clutter-backend-glx.c
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@ -250,7 +250,11 @@ clutter_backend_glx_get_features (ClutterBackend *backend)
* so we need to resort to manually synchronizing with the vblank so we
* always check for the video_sync extension...
*/
if (_cogl_check_extension ("GLX_SGI_video_sync", glx_extensions))
if (_cogl_check_extension ("GLX_SGI_video_sync", glx_extensions) &&
/* Note: the GLX_SGI_video_sync spec explicitly states this extension
* only works for direct contexts. */
glXIsDirect (clutter_x11_get_default_display (),
backend_glx->gl_context))
{
backend_glx->get_video_sync =
(GetVideoSyncProc) cogl_get_proc_address ("glXGetVideoSyncSGI");