i am guessing that the two matrices are set up like thispic.twitter.com/v0o5yqy5B6
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a vector ready for z division usually looks like {x y 1 z}, so the division by w is indeed a division by z. when all components are multiplied by w, which has been preinverted (a bit unusual): x' = (320 + 768*x) / z y'= (320 + 768*x) / z z' = 1 / z w' = 1
That looks somewhat close to how it is, it's just right now the Z divide on X/Y is being done before the inner equation, rather than after it. I've added some more debug logging, hopefully I can see what the actual verts look like before any transforms.
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it's super confusing that they have .x,.y .w as well as .p[0] to .p[3]
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and yes, it should be done before the inner equation, that would be even more correct; because the NDC coordinates are normalized, and only from there they're translated to pixel coordinates
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