i965: Fix ARB_indirect_parameters logic.
This patch modifies the ARB_indirect_parameters logic in brw_draw_prims, so that our implementation isn't affected if another application attempts to use predicates. Previously we were using a predicate with a DELTAS_EQUAL comparison operation and relying on the MI_PREDICATE_DATA register being 0. Our code to initialize MI_PREDICATE_DATA to 0 was incorrect, so we were accidentally using whatever value was written there. Because the kernel does not initialize the MI_PREDICATE_DATA register on hardware context creation, we might inherit the value from whatever context was last running on the GPU (likely another process). The Haswell command parser also does not currently allow us to write the MI_PREDICATE_DATA register. Rather than fixing this and requiring an updated kernel, we switch to a different approach which uses a SRCS_EQUAL predicate that makes no assumptions about the states of any of the predicate registers. Fixes Piglit's spec/arb_indirect_parameters/tf-count-arrays test. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103085 Signed-off-by:Plamena Manolova <plamena.manolova@intel.com> Reviewed-by:
Kenneth Graunke <kenneth@whitecape.org> (cherry picked from commit 048d4c45)
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