opengl pixel format regression

[Stefan Dösinger]

Hi Roderick,
Your pixel format patches caused a regression in half-life 1 for me with the 
fglrx drivers. It refuses to start in opengl mode and 
reports "ChoosePixelFormat failed", and then comes up in software(ddraw) 
mode. The d3d mode still works fine. This problem also does not occur with 
the open source radeon driver. I tested with fglrx 8.28.8 and fglrx 8.27.10. 
Other games seem to work fine(appart of a few fglrx bugs)

What infos do you need to debug this? This is the format table glxinfo 
reports:

   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 24  8 16 16 16 16  1 0 Slow
0x24 24 tc  0 32  0 r  .  .  8  8  8  8  0 24  8 16 16 16 16  1 0 Slow
0x25 24 tc  0 32  0 r  y  .  8  8  8  8  0 24  0 16 16 16 16  1 0 Slow
0x26 24 tc  0 32  0 r  .  .  8  8  8  8  0 24  0 16 16 16 16  1 0 Slow
0x27 24 tc  0 32  0 r  y  .  8  8  8  8  0 24  8  0  0  0  0  1 0 None
0x28 24 tc  0 32  0 r  .  .  8  8  8  8  0 24  8  0  0  0  0  1 0 None
0x29 24 tc  0 32  0 r  y  .  8  8  8  8  0 24  0  0  0  0  0  1 0 None
0x2a 24 tc  0 32  0 r  .  .  8  8  8  8  0 24  0  0  0  0  0  1 0 None
0x2b 24 dc  0 32  0 r  y  .  8  8  8  8  0 24  8 16 16 16 16  1 0 Slow
0x2c 24 dc  0 32  0 r  .  .  8  8  8  8  0 24  8 16 16 16 16  1 0 Slow
0x2d 24 dc  0 32  0 r  y  .  8  8  8  8  0 24  0 16 16 16 16  1 0 Slow
0x2e 24 dc  0 32  0 r  .  .  8  8  8  8  0 24  0 16 16 16 16  1 0 Slow
0x2f 24 dc  0 32  0 r  y  .  8  8  8  8  0 24  8  0  0  0  0  1 0 None
0x30 24 dc  0 32  0 r  .  .  8  8  8  8  0 24  8  0  0  0  0  1 0 None
0x31 24 dc  0 32  0 r  y  .  8  8  8  8  0 24  0  0  0  0  0  1 0 None
0x32 24 dc  0 32  0 r  .  .  8  8  8  8  0 24  0  0  0  0  0  1 0 None
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