Eric Anholt 1633c9735a
freedreno: Disable UBWC on z24s8 on a630. ...
Stencil texture sampling (such as what we have to do for BlitFramebuffer)
is broken with UBWC enabled. We can't just take the
fd_resource_uncompress() path, because that's a blit just like
BlitFramebuffer.
Fixes failure in dEQP-GLES3.functional.fbo.msaa.2_samples.stencil_index8,
but also the uncaught rendering fails of 4_samples.stencil_index8 and
depth24_stencil8.
Prior to "911ce374caf0 freedreno/a6xx: Fix MSAA clear" we would usually
pass and sometimes flake fail on this test occasionally, thus it being
listed as a flake (though the rendering was actually broken). Since that
commit, though, we consistently fail on a pixel of the broken rendering,
and thus this was brought to my attention by the #freedreno-ci channel
spam.
Rob took a look at the performance impact of this, and the worst was maybe
up to .5% fps hit on trex.
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8319 >
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Eric Anholt
1633c9735a