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0e1bdd0057
Writing depth with blend enabled means we need to invalidate LRZ,
because the written depth value could mean that a later draw with
depth enabled (where we would otherwise write LRZ) could have
fragments which don't pass the depth test due to this draw. For
example, consider this sequence of draws, with depth mode GREATER:
draw A:
z=0.1, fragments pass
draw B:
z=0.4, fragments pass
blend enabled (LRZ write disabled)
depth write enabled
draw C:
z=0.2, fragments don't pass
blend disabled
depth write enabled
Normally looking at the state in draw C, we'd assume we could
enable LRZ write. But this would cause early-z/lrz to discard
fragments from draw A which should be visible due to draw B.
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/8065
Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20708>
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