commit 531ea3596da0476794b783fd0f0ac37b1ea07a39
author Iago Toral Quiroga <itoral@igalia.com> Mon Aug 03 11:41:28 2020 +0200
committer Marge Bot <eric+marge@anholt.net> Tue Oct 13 21:21:32 2020 +0000
tree fd91266d0711ec3a4e15d49fe48dc96223745406
parent b7ca46762f23709def04ee23cca569da2c801fae

broadcom/compiler: implement nir_intrinsic_load_sample_pos

This is intended to return the sample location within the pixel.

Fixes:
dEQP-VK.pipeline.multisample_shader_builtin.sample_position.*

Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>

src/broadcom/compiler/nir_to_vir.c

diff --git a/src/broadcom/compiler/nir_to_vir.c b/src/broadcom/compiler/nir_to_vir.c
index e40c1f0..c03afcb 100644
--- a/src/broadcom/compiler/nir_to_vir.c
+++ b/src/broadcom/compiler/nir_to_vir.c
@@ -2444,6 +2444,13 @@
                 ntq_store_dest(c, &instr->dest, 0, vir_SAMPID(c));
                 break;
 
+        case nir_intrinsic_load_sample_pos:
+                ntq_store_dest(c, &instr->dest, 0,
+                               vir_FSUB(c, vir_FXCD(c), vir_ITOF(c, vir_XCD(c))));
+                ntq_store_dest(c, &instr->dest, 1,
+                               vir_FSUB(c, vir_FYCD(c), vir_ITOF(c, vir_YCD(c))));
+                break;
+
         default:
                 fprintf(stderr, "Unknown intrinsic: ");
                 nir_print_instr(&instr->instr, stderr);