i am guessing that the two matrices are set up like thispic.twitter.com/v0o5yqy5B6
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W ends up being 1 / Z. The actual poly Z is more or less ignored by the existing emulation, minZ and maxZ are determined based on the min and max Z values on each vert.
With the current implementation, a couple of games on this hardware actually seem to render valid scenes, but are glitchy, while other games end up with scenes that are completely trashed. I suspect ignoring the projection that the game itself is sending is why. :)
