[Bug 35963] crash in Syberia2

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=35963

--- Comment #10 from Henri Verbeet <hverbeet at gmail.com> ---
(In reply to farmboy0+winehq from comment #9)
> %f prints the value as -nan so you are correct.
> but both the directx manual and the opengl spec define the values as >= 0,
> so the check should be correct.
Yes, but I think it should be unnecessary, since GL should take care of it.

> There is a bug in mesa however as the glLight function is supposed to return
> GL_INVALID_VALUE on negative values of ATTENUATION.
Yes. Specifically, at
http://cgit.freedesktop.org/mesa/mesa/tree/src/mesa/main/light.c#n257 "if
(params[0] < 0.0) {" should probably either read "if (!(params[0] >= 0.0)) {",
or explicitly check for NaN.
http://cgit.freedesktop.org/mesa/mesa/tree/src/mesa/main/light.c#n173 does use
">= 0.0" in the assertion, at that's probably what causes your issue.

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