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Re: [Bug-gnubg] 3d board and DRI


From: Jon Kinsey
Subject: Re: [Bug-gnubg] 3d board and DRI
Date: Thu, 03 Jun 2004 10:08:51 +0100
User-agent: Mozilla Thunderbird 0.6 (Windows/20040502)

Jim Segrave wrote:

Under 24 bit mode, no
acceleration, the 3d board is quite usable even without the fast
update option, although the animation is a little bit jerky. Gnubg
says it's about 0.4 fps which it refers to as extremely slow.

The timing code still can't be right for you, I would guess you are getting more like 4fps here.

> So I
tried 16 bit mode. Now gnubg says it's very fast and, with shadows
disabled, it is blindingly fast with very smooth animations. But if
shadows are enabled. the shadows simply become seemingly random dark
patches over the board - it looks like it's got some particularly
unpleasant form of video eczema.
Is there any assumption of 24 bpp modes in the shadow code, or is it
likely to be a driver problem? The only other test I had to hand was
glxgears, which animates perfectly in 16 bit mode.

The code works fine at 16/24/32 bpp the issue here is probably the stencil buffer (which is used to calculate the shadow areas). I guess that this might be very small (less than 8bpp?) making large areas of the screen shadowed. Try running glxinfo to get some info on the display mode.

Jon





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