[Bug 106283] Shader replacements works only for limited use cases

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106283

            Bug ID: 106283
           Summary: Shader replacements works only for limited use cases
           Product: Mesa
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: glsl-compiler
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: iive at yahoo.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

In the mesa documentation here: https://www.mesa3d.org/shading.html#envvars
you can find a section about "Shader Replacement" that tells you how you can
dump the source of GLSL shaders and even replace some shaders with your own.

Unfortunately, I couldn't make this work for the app that is having a problem.

I dig a bit in the Mesa code and came to the conclusion that the dump&replace
works only for the  glProgramStringARB(),  while the app seems to provide the
shader through  glShaderSourceARB()  that seems to be completely separate from
the code that supports dump&replace.

It would be nice if this feature could work with all code paths.

In the past, I've been able to narrow down at least two R600 assembly bugs, by
tweaking the shaders that generate them (using d3d9 library that can do that).
It's very disappointing that Mesa has the functionality, but it works only for
a limited code paths.

At very least, document properly that quirk.

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