Mesa (staging/21.2): pan/bi: Use ST_TILE for multisampled blend output
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Mon Aug 23 17:44:11 UTC 2021
Module: Mesa
Branch: staging/21.2
Commit: 17324031ed096a235d43046ecaed71672e59749e
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=17324031ed096a235d43046ecaed71672e59749e
Author: Alyssa Rosenzweig <alyssa at collabora.com>
Date: Wed Aug 18 22:12:02 2021 +0000
pan/bi: Use ST_TILE for multisampled blend output
ST_TILE lets us specify an explicit sample, whereas BLEND replicates to
all samples. This fully fixes the interaction between blend shaders and
multisampling on Bifrost, manifesting as
dEQP-GLES3.functional.fragment_ops.random.* failures with the
configuration rgba8888d24s8ms4.
Signed-off-by: Alyssa Rosenzweig <alyssa at collabora.com>
Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12478>
(cherry picked from commit bfd3ae35c9713a827adc4568be0725740884f3ff)
---
.pick_status.json | 2 +-
src/panfrost/bifrost/bifrost_compile.c | 16 +++++++++++-----
2 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/.pick_status.json b/.pick_status.json
index 06bb411a09f..17109a390c2 100644
--- a/.pick_status.json
+++ b/.pick_status.json
@@ -265,7 +265,7 @@
"description": "pan/bi: Use ST_TILE for multisampled blend output",
"nominated": true,
"nomination_type": 0,
- "resolution": 0,
+ "resolution": 1,
"main_sha": null,
"because_sha": null
},
diff --git a/src/panfrost/bifrost/bifrost_compile.c b/src/panfrost/bifrost/bifrost_compile.c
index 1402e46a017..326dc0915d5 100644
--- a/src/panfrost/bifrost/bifrost_compile.c
+++ b/src/panfrost/bifrost/bifrost_compile.c
@@ -480,11 +480,17 @@ static void
bi_emit_blend_op(bi_builder *b, bi_index rgba, nir_alu_type T, unsigned rt)
{
/* Reads 2 or 4 staging registers to cover the input */
- unsigned sr_count = (nir_alu_type_get_type_size(T) <= 16) ? 2 : 4;
-
- if (b->shader->inputs->is_blend) {
- uint64_t blend_desc = b->shader->inputs->blend.bifrost_blend_desc;
-
+ unsigned size = nir_alu_type_get_type_size(T);
+ unsigned sr_count = (size <= 16) ? 2 : 4;
+ const struct panfrost_compile_inputs *inputs = b->shader->inputs;
+ uint64_t blend_desc = inputs->blend.bifrost_blend_desc;
+
+ if (inputs->is_blend && inputs->blend.nr_samples > 1) {
+ /* Conversion descriptor comes from the compile inputs, pixel
+ * indices derived at run time based on sample ID */
+ bi_st_tile(b, rgba, bi_pixel_indices(b, rt), bi_register(60),
+ bi_imm_u32(blend_desc >> 32), BI_VECSIZE_V4);
+ } else if (b->shader->inputs->is_blend) {
/* Blend descriptor comes from the compile inputs */
/* Put the result in r0 */
bi_blend_to(b, bi_register(0), rgba,
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