[Bug 35963] crash in Syberia2

[wine-bugs at winehq.org]

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

--- Comment #13 from farmboy0+winehq at googlemail.com ---
After some more research I have come to the conclusion that the mesa
implementation is in accordance with the OpenGL 2.1 spec.
(http://www.opengl.org/sdk/docs/man2/xhtml/glLight.xml)

The spec says:
GL_CONSTANT_ATTENUATION
GL_LINEAR_ATTENUATION
GL_QUADRATIC_ATTENUATION
                        params is a single integer or floating-point value that
specifies
                        one of the three light attenuation factors.
                        Integer and floating-point values are mapped directly.

                        **Only nonnegative values are accepted.**

                        etc..

It also says:
GL_INVALID_VALUE is generated ... if a negative attenuation factor is
specified.

NaN is neither nonnegative nor negative thus it is neither accepted nor is an
error generated which is exactly what Mesa does.

This means that it is wine's responsibility to reject NaN values.

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