https://bugs.freedesktop.org/show_bug.cgi?id=28771 --- Comment #11 from Alex Deucher <agd5f@xxxxxxxxx> 2010-07-18 01:10:40 PDT --- (In reply to comment #10) > > What is the real solution and why is this patch needed in DDX? The real solution to what? The various GLX vsync/vblank extensions basically just expose frame counters and vertical retrace events to applications so they can use them for synchronization. They have nothing to do with tearing prevention directly. The code in the ddx you are asking about has nothing to do with the GLX vsync/vblank extensions; it is there to prevent tearing on GL buffer swaps. The variable should probably have been called vline_wait rather than vsync. What the code does is forces the GPU to wait until the current scanline is past the area that will be updated by the swap before doing the swap blit. It's the same method used by Xv to prevent tearing when rendering to the front buffer. -- Configure bugmail: https://bugs.freedesktop.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
