GLSL: User Clipping Planes

Hello,

(in some way further discussion to CG Using Clipping Planes thread ...)

okay we learned that if we activate programmable vertex shaders our user
clipping does not do anymore:
there is only a gl_Position = ftransform ()
and no gl_ClipVertex = ftransformClip () or so ... (see spec)

(by the way on a ati card i got user clipping planes working with a
programmable vertex shader and the gl_ClipVertex set correctly?! but thats
another thing ...)

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now i only activate the programmable pixel shader and leave the vertex
fixed pipeline as is.

then the fx5x series does no user clipping but fx6x does.
there are also some ati cards that do user clipping and some who do not.

does anyone have similar experiences? how can this be?

Thanks,
Andreas



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