[Bug 27194] The Witcher 2: White/coloured screen with UseGLSL=enabled

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=27194

--- Comment #6 from Silver <number048 at gmail.com> 2011-07-04 08:16:02 CDT ---
I can shed some additional light on the problem.

The GL_INVALID_OPERATION from the original description is actually not the real
problem. Instead it's just the cause of a failed shader compile. The reason why
the shader fails is because it contains illegal code. Looking at shader object
8 from the attached log it's apparent that the generated shader code uses
sampler variables which hasn't been declared.

For example the error on line 94 corresponds to the line "R5.xyzw =
(texture2D(Psampler5, R1.zw).xyzw);". Only Psampler[0-3] are defined!

Disabling GLSL isn't a real fix either because ironically the generated ARB
shader also contains errors. (It's possible that nvidia is able to cope with
these errors more graciously than AMD).

Because the error originates from the generation of the OpenGL shader, this is
clearly a wine bug and totally unrelated to any hardware driver.

A short description of the bug could be: "Error during conversion from DirectX
shader to OpenGL shader".


I tried to locate the bug in the wine source code. But even though I know in
which files to search for the problem, I'm not familiar enough with the source
code to be able to pinpoint the relevant locations.


Currently the latest git version is still effected by this bug.

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