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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my point stands
Sure, but it ultimately boils down to the resulting X and Y members of vertex_t should theoretically be in the range of 0..639 and 0..479.
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from the matrix values you told me, my assumption is that the values would be in NDC coordinates, and the the 772* value in the last corner scales the vector's x/y components to pixel size. only a single one is required to do that.
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The baffling thing is that I'm not sure the meaning of the 772 value. I have, however, found a much better scene, as it has a single full-screen quad.
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