Comment # 2
on bug 92184
from Roland Scheidegger
Not sure, but I don't think there should be a fallback for the blit in this case. This is for map/unmap_renderbuffer after all, and if it asserts in unmap this means the blit from the rb to some temp buffer was succesful. I see no reason why it shouldn't be possible to blit it back - it was a rb after all, so should have all the required alignment, format etc. in the first place. Some of the examples you listed actually look like they should only really map/unmap zs buf not color, albeit the fallback might just map/unmap everything always (IIRC that was actually the case last I checked several years ago, and sometimes responsible for some huge slowdown compared to some old dri1 code - you draw a single point with some unsupported setup, and 99.999% of the time spent in the fallback was just for blitting everything to some buffer and back). Or could there be a problem if there's not actually a color rb and it tries to blit that?
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