From e2cb562dd1bd79f0e4b1b2597cfb0fa6b5f8c22a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcin=20=C5=9Alusarz?= <marcin.slusarz@intel.com>
Date: Thu, 24 Feb 2022 17:06:33 +0100
Subject: [PATCH] intel/compiler: ignore per-primitive attrs when calculating
 flat input mask

If we say that per-primitive attributes are flat (which is communicated by
3DSTATE_SBE.ConstantInterpolationEnable), GPU freaks out and applies it
to other (non-flat) attributes.

Fixes: be89ea3231c ("intel/compiler: Handle per-primitive inputs in FS")

Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15169>
---
 src/intel/compiler/brw_fs.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/intel/compiler/brw_fs.cpp b/src/intel/compiler/brw_fs.cpp
index 359262ca489..46e346ec984 100644
--- a/src/intel/compiler/brw_fs.cpp
+++ b/src/intel/compiler/brw_fs.cpp
@@ -9452,6 +9452,9 @@ brw_compute_flat_inputs(struct brw_wm_prog_data *prog_data,
    prog_data->flat_inputs = 0;
 
    nir_foreach_shader_in_variable(var, shader) {
+      if (var->data.per_primitive)
+         continue;
+
       unsigned slots = glsl_count_attribute_slots(var->type, false);
       for (unsigned s = 0; s < slots; s++) {
          int input_index = prog_data->urb_setup[var->data.location + s];