Mesa (main): agx: Implement blend constant color sysvals

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Module: Mesa
Branch: main
Commit: 06fe6651b3172eb56495a4cc863905d119c0fe76
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=06fe6651b3172eb56495a4cc863905d119c0fe76

Author: Alyssa Rosenzweig <alyssa at rosenzweig.io>
Date:   Tue May  4 22:37:15 2021 -0400

agx: Implement blend constant color sysvals

Signed-off-by: Alyssa Rosenzweig <alyssa at rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10720>

---

 src/asahi/compiler/agx_compile.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/asahi/compiler/agx_compile.c b/src/asahi/compiler/agx_compile.c
index dd9b6320d48..34270b2e15e 100644
--- a/src/asahi/compiler/agx_compile.c
+++ b/src/asahi/compiler/agx_compile.c
@@ -236,6 +236,15 @@ agx_emit_load_ubo(agx_builder *b, nir_intrinsic_instr *instr)
    return agx_wait(b, 0);
 }
 
+static agx_instr *
+agx_blend_const(agx_builder *b, agx_index dst, unsigned comp)
+{
+     agx_index val = agx_indexed_sysval(b->shader,
+           AGX_PUSH_BLEND_CONST, AGX_SIZE_32, comp * 2, 4 * 2);
+
+     return agx_mov_to(b, dst, val);
+}
+
 static agx_instr *
 agx_emit_intrinsic(agx_builder *b, nir_intrinsic_instr *instr)
 {
@@ -275,6 +284,11 @@ agx_emit_intrinsic(agx_builder *b, nir_intrinsic_instr *instr)
   case nir_intrinsic_load_vertex_id:
      return agx_mov_to(b, dst, agx_abs(agx_register(10, AGX_SIZE_32))); /* TODO: RA */
 
+  case nir_intrinsic_load_blend_const_color_r_float: return agx_blend_const(b, dst, 0);
+  case nir_intrinsic_load_blend_const_color_g_float: return agx_blend_const(b, dst, 1);
+  case nir_intrinsic_load_blend_const_color_b_float: return agx_blend_const(b, dst, 2);
+  case nir_intrinsic_load_blend_const_color_a_float: return agx_blend_const(b, dst, 3);
+
   default:
        fprintf(stderr, "Unhandled intrinsic %s\n", nir_intrinsic_infos[instr->intrinsic].name);
        unreachable("Unhandled intrinsic");