[Mesa-dev] [Bug 93813] Incorrect viewport range when GL_CLIP_ORIGIN is GL_UPPER_LEFT

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93813

--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
And FWIW this is what st/nine does (which uses the upper_left/zero-to-one
convention):

    pvport.scale[0] = (float)vport->Width * 0.5f;
    pvport.scale[1] = (float)vport->Height * -0.5f;
    pvport.scale[2] = vport->MaxZ - vport->MinZ;
    pvport.translate[0] = (float)vport->Width * 0.5f + (float)vport->X;
    pvport.translate[1] = (float)vport->Height * 0.5f + (float)vport->Y;
    pvport.translate[2] = vport->MinZ;

So I'm suspecting that it's mesa that's wrong. Really need to draw this out on
paper and compare to the spec.

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