[Mesa-dev] [PATCH 09/11] nir: add lowering stage for user-clip-planes / clipdist

[Erik Faye-Lund]

On Tue, Sep 15, 2015 at 6:49 PM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
> However having a piglit test that covers this would be neat... I guess
> you could clip a pixel in half and make sure that the resolved result
> is some in-between color? Lots of implementation-dependent stuff going
> on in there though.

I think this would simply be a matter of drawing a white triangle on a
black background both with clipping and pre-clipped, and verify that
the result is the same. Perhaps even using a few differently sub-pixel
jittered triangles.