Owen W. Taylor 5425a6e311 Call glFinish() before manually waiting for VBLANK
If we manually wait for the VBLANK with:

  - SGI_video_sync
  - Direct usage of the DRM ioctl

Then we should call glFinish() first, or otherwise the swap-buffers
may be delayed by pending drawing and cause a tear.

http://bugzilla.openedhand.com/show_bug.cgi?id=1636

Signed-off-by: Emmanuele Bassi <ebassi@linux.intel.com>
2009-07-13 15:18:12 +01:00
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