[Mesa-dev] [Bug 44561] Piglit: spec/glsl-1.10/execution/interpolation/interpolation-none-gl_*-vertex fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=44561

--- Comment #2 from Christoph Bumiller <e0425955 at student.tuwien.ac.at> 2012-01-10 08:26:03 PST ---
Like I already mentioned on ML, i915g isn't using the ClipVertex for the
clipping calculation, but Position (ClipVertex didn't exist before, thus
whenever it was not equal to gl_Position things wouldn't have worked properly). 

The reason it worked before lies in the nature of the test.

The transformation done to the plane coefficients is the inverse of the
transformation from gl_ClipVertex and gl_Position; the prior is correctly
omitted now if a vertex shader is bound in OpenGL.

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