I recently spent a lot of time debugging fast clears. The hardware
documentation is confusing on the subject, so I began poking individual
bits in the auxiliary surface to better understand why things were not
working as expecting.
Some of you (CC'd) may find my debug branch useful if you ever find
yourself in a similar situation.
http://cgit.kiwitree.net/~chadv/mesa/log/?h=debug-intel-aux-surfaces
http://cgit.kiwitree.net/~chadv/piglit/log/?h=debug-intel-aux-surfaces
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