[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 #20 from Nephyrin zey <Nephyrin at nephyrin.net>  2010-01-04 14:25:20 ---
(In reply to comment #18)
> (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.

Perhaps wine should do some tests on the implementation at startup to determine
the behavior of undefineds like div 0 and log 0, and assuming at least one +INF
generating special is available, store it in a constant? Or is this way too
hacky as well? It seems like implementing dx shaders with a defined floating
point model on GLSL without one is basically not possible without manually
resolving any ambiguous operations.

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