[Bug 22045] Re: Poor performance / flickering with OpenGL hacks

Paul Sladen ubuntu at paul.sladen.org
Tue Apr 11 16:54:39 UTC 2006

On this machine (i915 graphics) the OpenGL hacks aren't getting a z-buffer (depth buffer) so look like the polygons are all drawn in the wrong order.

I'm guessing the hacks are choosing (or being given...) the wrong GLX visual to draw to.  Eg. if it was choosig the first one in the list, rather than the closest then this would explain it, as:

  $ glxinfo | grep -m1 -B3 '^0x'
     visual  x  bf lv rg d st colorbuffer ax dp st accumbuffer  ms  cav
   id dep cl sp sz l  ci b ro  r  g  b  a bf th cl  r  g  b  a ns b eat
  0x23 24 tc  0 32  0 r  y  .  8  8  8  8  0  0  0  0  0  0  0  0 0 None

the first one is one without an offered double-buffer.
Poor performance / flickering with OpenGL hacks

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