[Mesa-dev] [PATCH 1/5] draw: make sure clipdistances work with geometry shaders

Zack Rusin zackr at vmware.com
Tue Jun 11 11:12:02 PDT 2013

> > +   unsigned clipdistance_output[2];
> Why 2?  Are there four clip distances per register, and we need 8 (or
> 6?) of them?  Maybe add some comments.

Hmm, I thought we already had a documentation for it. It's the same code that we already have in the vertex shader, just extending it to geometry shaders. I'll check it. Clip distances and cull distances support up to 8 planes and they're packed into two register with each value being a float32 referring to a single plane.


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