[Bug 46304] Fog handling seems to be off in Prince of Persia

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=46304

--- Comment #2 from Henri Verbeet <hverbeet at gmail.com> ---
(In reply to Gert from comment #0)
> I have not yet investigated why wine creates different code path for the two
> drivers, I guess that it depends on some extension(s) that may or may not be
> available. 
> 
I'm mostly on vacation, so haven't really looked at this, but part of the
difference in the generated code is due to ARB_clip_control being available or
not. (I.e., see the condition on the shader_glsl_fixup_position() call in
shader_glsl_generate_vs_epilogue().)

Are you sure those are from the same D3D source shader though? The code is very
similar, but reordering e.g. vs_c[20] vs. vs_c[16] is not something wined3d
would do.

This also sounds suspiciously similar to bug 17423, any chance it's the same
issue?

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