@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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I think it's a mismatch between FBO and backbuffer size, and my post-shader is doing weird things. Also I'm not clearing the backbuffer before writing to it. But that's an old-ish thing, not really working on it right now so this is all wild conjecture.
It looks like there are multiple tiles with a common size multiple. Is your FBO an even fraction of the backbuffer size?
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Not quite. But it gets better. My log tells me I failed to create a new FBO when resizing, this setting the handle to 0. So on the second resize, I attempt to delete the backbuffer. Now I'm rendering to & blitting from a non-existant FBO, to a "deleted" backbuffer.
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And it does tend to reuse the same memory, so it's the mangled previous render, but channels have been shifted and the tiling doesn't match.
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