> 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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