Render test case is kinda working now, at least for purposes of actually rendering stuff; assertions to follow. when I decide how I'm going to do them... I'd _like_ to dump the full image to file and compare, but sadly I've got little chance of it matching up perfectly as long unless/until I write a software renderer. Something that I don't really want to do right this moment. Testing individual points of interest might be doable though.
Incidentally, it seems the pvr doesn't like drawing the backplane behind the far z-clip. Which makes sense I suppose. The backplane is kinda interesting inasmuch as it takes an arbitrary 3 points and extrapolates those out to fill the full viewport.