@thynnmas It occurs to me that you'd be awesome at contributing to MAME, but the amount of legacy and WTF-code would probably give you an aneurysm.
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Weird that the uninit'd memory seems to have valid texels rather than being complete garbage. I guess it makes sense though if the driver re-uses the most recently used area of VRAM that fits.
I'm admittedly totally talking out my posterior here, my primary experience with graphics programming ended roughly when the Wii did.