[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 #9 from Nicholas Miell <nmiell at gmail.com> ---
(In reply to comment #7)
>Trine 2 uses those old assembly-like shaders for some reason

It's the minimum spec target profile for Nvidia's Cg compiler.

> This cannot work
> as shadow sampling is only defined for depth textures. According to the
> ARB_fragment_program_shadow specification (Trine 2 uses those old
> assembly-like shaders for some reason), it is undefined behaviour to sample
> from non-depth textures.

ARB_fragment_program_shadow may leave it undefined, but the GL spec says the
texture unit operates in the normal manner and texture comparison is bypassed
if the currently bound texture's base internal format is not DEPTH_COMPONENT or
DEPTH_STENCIL.

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