[Bug 66067] Trine 2's fragment normal buffer is mixtextured on Radeon HD 6770 (Juniper)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66067

--- Comment #11 from Grigori Goronzy <greg at chown.ath.cx> ---
> ARB_fragment_program_shadow may leave it undefined, but the GL spec ...

Which spec exactly? GL specifications only cover GLSL shaders.
ARB_fragment_program is separate from that and has its own rules. The extension
specification clearly states that behaviour is undefined.

Besides, OpenGL contradicts itself a little bit: in GL 4.4 spec, 15.2.1 it
states that behaviour is undefined for this case, too. It makes much more sense
anyway, shadow sampling is wildly different from sampling a texture normally in
terms of what the sampling result look like.

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