[Mesa-dev] [PATCH 3/5] panfrost: Disable PIPE_CAP_TGSI_TEXCOORD

Alyssa Rosenzweig alyssa at rosenzweig.io
Fri Mar 15 17:39:25 UTC 2019


> So you have to be able to generate both S,T and S,1-T. [Or
> perhaps there's an explicit control for it, I forget.] With GLES2+,
> it's just gl_PointCoord though.

FWIW, the blob emits a linear (er, affine technically?) transformation
in the shader to do the flip, loading the matrix from a special uniform
so they can reuse the same shader across contexts and maybe also APIs.
This seems a little excessive to me since for OpenGL scanout they're
just using the identity matrix but hey.
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