My favorite GL bug is when nothing happens when I run it, but when I capture a frame and inspect it in @RenderDoc, everything renders as I expect. *sigh*
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Now using glMemoryBarrier(GL_ALL_BARRIER_BITS) just for my sanity and it still doesn't work. =/ Compute shader fills whole texture with red (1,0,0,1). Then render a triangle with UVs. Everything looks right in RD frame inspector. Black otherwise. *sigh*
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Turns out it didn't like that I never cleared the FBO I was drawing to. *shrug* Once I put a clear color first, it all worked.
