Mesa (main): microsoft/compiler: Support load_sample_id_no_per_sample

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Module: Mesa
Branch: main
Commit: cd4bc4893b1483dd21e14010a56dd073ff0ad7bd
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=cd4bc4893b1483dd21e14010a56dd073ff0ad7bd

Author: Boris Brezillon <boris.brezillon at collabora.com>
Date:   Fri Apr 22 14:57:37 2022 +0200

microsoft/compiler: Support load_sample_id_no_per_sample

It's like load_sample_id except it shouldn't force per-sample shading
when not already enabled. In that case, we simply return 0.

Reviewed-by: Erik Faye-Lund <erik.faye-lund at collabora.com>
Reviewed-by: Jesse Natalie <jenatali at microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16926>

---

 src/microsoft/compiler/nir_to_dxil.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/microsoft/compiler/nir_to_dxil.c b/src/microsoft/compiler/nir_to_dxil.c
index ad3f962d4d9..e325f2a42e7 100644
--- a/src/microsoft/compiler/nir_to_dxil.c
+++ b/src/microsoft/compiler/nir_to_dxil.c
@@ -4111,6 +4111,20 @@ emit_load_layer_id(struct ntd_context *ctx, nir_intrinsic_instr *intr)
    return true;
 }
 
+static bool
+emit_load_sample_id(struct ntd_context *ctx, nir_intrinsic_instr *intr)
+{
+   assert(ctx->mod.info.has_per_sample_input ||
+          intr->intrinsic == nir_intrinsic_load_sample_id_no_per_sample);
+
+   if (ctx->mod.info.has_per_sample_input)
+      return emit_load_unary_external_function(ctx, intr, "dx.op.sampleIndex",
+                                               DXIL_INTR_SAMPLE_INDEX);
+
+   store_dest_value(ctx, &intr->dest, 0, dxil_module_get_int32_const(&ctx->mod, 0));
+   return true;
+}
+
 static bool
 emit_intrinsic(struct ntd_context *ctx, nir_intrinsic_instr *intr)
 {
@@ -4146,8 +4160,8 @@ emit_intrinsic(struct ntd_context *ctx, nir_intrinsic_instr *intr)
       return emit_load_unary_external_function(ctx, intr, "dx.op.primitiveID",
                                                DXIL_INTR_PRIMITIVE_ID);
    case nir_intrinsic_load_sample_id:
-      return emit_load_unary_external_function(ctx, intr, "dx.op.sampleIndex",
-                                               DXIL_INTR_SAMPLE_INDEX);
+   case nir_intrinsic_load_sample_id_no_per_sample:
+      return emit_load_sample_id(ctx, intr);
    case nir_intrinsic_load_invocation_id:
       switch (ctx->mod.shader_kind) {
       case DXIL_HULL_SHADER: