[Bug 11285] Static characters on Nvidia 7xxx cards in Witcher

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=11285





--- Comment #1 from Roderick Colenbrander <thunderbird2k at gmx.net>  2008-01-20 07:41:39 ---
I don't think it is neither a Wine or driver bug. Let me explain what I expect
the problem is (you might also see fixmes related to the problem in the
console).

Modern games use shaders for most of the rendering. In general the shaders get
more advanced for higher quality settings in game. More complex shaders tend to
use more 'uniforms' ('input variables for the shader'). Each different GPU
generation defined by 'shader model 1/2/3/4' allows larger shaders and more
uniforms.

The problem is that for emulating differences between Direct3D and OpenGL, wine
steals 'some' of the uniforms and this can cause issues in games that push
Direct3D9 (shader model 3.0) to its limits. The first shader model 3.0 cards
are the Geforce6 and Geforce7 and they offer precise the number of uniforms
required by shader model 3.0. This means that after Wine's magic there are not
enough uniforms left. This can cause rendering issues. Geforce8 cards support
much more uniforms than Geforce6/7 cards and don't have issues.


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