acaf07c24b
Starting with GL 3.0 it's legal to have no drawable bound to the current context. GLX_SGI_video_sync doesn't take a drawable for an argument so it implicitly operates on... something. NVIDIA's driver throws GLX_BAD_CONTEXT for GetVideoSync, but WaitVideoSync seems to actually wait for the next MSC on the context's screen. We could work around this by internally creating/destroying a GLXWindow for the root window, but for Xwayland there's not necessarily a good answer it can return. Just throw GLX_BAD_CONTEXT for both. Fixes: mesa/mesa#1207 Reviewed-by: Michel Dänzer <mdaenzer@redhat.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8334>