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turnip: Enable LRZ testing (not writing) in the presence of discards.

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We can LRZ test to not rasterize maybe-discarded pixels, as long as we
don't LRZ write a Z that may be discarded.  We can drop this check,
because LRZ writes are already disabled by TU_LRZ_FORCE_DISABLE_WRITE, and
tu_6_build_depth_plane_z_mode() uses has_kill to choose EARLY_LRZ_LATE_Z
(or just LATE_Z if LRZ isn't enabled).

gfxbench aztec ruins:    +7.93104% +/- 0.117845% (n=4)
ANGLE trex_200:          +11.7208% +/- 0.476166% (n=3)
ANGLE aztec_ruins_high:  +11.9138% +/- 0.147586% (n=3)

Fixes: #6327 (now vk-5-normal is +0.712724% +/- 0.0655751% to gl-5-normal)
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19286>
This commit is contained in:
Emma Anholt
2022-10-24 17:05:03 -07:00
committed by Marge Bot
parent bdfdc40a25
commit 1ac42912cc
1 changed files with 1 additions and 1 deletions
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src/freedreno/vulkan/tu_pipeline.c
+1 -1
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@@ -1680,7 +1680,7 @@ tu6_emit_fs_outputs(struct tu_cs *cs,
pipeline->lrz.fs.early_fragment_tests = fs->fs.early_fragment_tests;
if (!fs->fs.early_fragment_tests &&
(fs->no_earlyz || fs->has_kill || fs->writes_pos || fs->writes_stencilref || fs->writes_smask)) {
(fs->no_earlyz || fs->writes_pos || fs->writes_stencilref || fs->writes_smask)) {
pipeline->lrz.force_late_z = true;
}