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We emit these before configuring depth in the normal path, or actually using the depth buffer in BLORP - we just failed to emit them when disabling depth altogether. On Sandybridge, this also requires the post_sync_nonzero flush. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Chad Versace <chad.versace@linux.intel.com> Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>