[Nouveau] [Bug 61854] [nv50]glClipPlane not clipping correctly for glsl

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=61854

Christoph Bumiller <e0425955 at student.tuwien.ac.at> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |NOTOURBUG

--- Comment #3 from Christoph Bumiller <e0425955 at student.tuwien.ac.at> ---
blender's shader says:
"gl_ClipVertex works only on NVIDIA graphic cards so we have to check with
__GLSL_CG_DATA_TYPES"

The GL 2.0 spec says:
"If gl ClipVertex is not written by the vertex shader, its value is undefined,
which implies that the results of clipping to any client-defined clip planes are
also undefined."

I don't know with which driver they tested this (maybe on a gallium driver
before gl_ClipVertex was handled, which came rather late ?), but they can't
expect undefined behaviour to work everywhere.

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