[Bug 20053] Team-Fortress 2 and other source games suffer from black menu and missing UI textures in dx9 mode

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=20053





--- Comment #18 from Henri Verbeet <hverbeet at gmail.com>  2010-01-04 12:39:16 ---
(In reply to comment #17)
> As far as I understand it: Drivers up to 180.60 returned INF on divide by zero
> in shaders. Newer ones return NaN, which directx does not expect, causing
> issues. This hack changes the particular offending shader path to check for div
> by zero and make sure it generates INF. It does not fix the problem in general,
> just masks it, hence, a hack.
> 
The problem with the hack is mostly that it returns 0.0 instead of +INF. The
problem with writing a proper fix is that I don't know a practical/reliable way
to generate +INF in GLSL.

For what it's worth, the main difference between NaN and +INF that TF2 cares
about is that NaN keeps propagating while e.g. "clamp(+INF, 0.0, 1.0);" returns
1.0.

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