This gets us equivalent code paths on BDW and pre-BDW, except for stencil
(where we don't have MSAA stencil resolve code yet)
Improves MSAA-forced citybench by 7.94496% +/- 2.38429% (n=16). Reduces
DRI2 MSAA glxgears performance by -12.3559% +/- 1.52845% (n=9).
v2: Move the new meta code to brw_meta_updownsample.c, name it
brw_meta_updownsample(), add a comment about
intel_rb_storage_first_mt_slice(), and rename that function and move
the RB generation into it (review ideas by Ken).
v3: Fix 2 src vs dst pasteos in previous change.
v4: Skip this path pre-gen8 for now, until we can analyze the glxgears
performance delta some more.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Eric Anholt
4545ec1691