Mesa (master): radv/ac: add implementation of load_sample_pos intrinsic.

[Dave Airlie]

Module: Mesa
Branch: master
Commit: 3c6151ccafeb47febb8320b7f4f7bbc0e819708e
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=3c6151ccafeb47febb8320b7f4f7bbc0e819708e

Author: Dave Airlie <airlied at redhat.com>
Date:   Wed Nov 16 03:54:22 2016 +0000

radv/ac: add implementation of load_sample_pos intrinsic.

This fixes a bunch of crashes in CTS tests looking for this.

Reviewed-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
Signed-off-by: Dave Airlie <airlied at redhat.com>

---

 src/amd/common/ac_nir_to_llvm.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index 17cefea..741a082 100644
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -2764,6 +2764,15 @@ static LLVMValueRef load_sample_position(struct nir_to_llvm_context *ctx,
 	return build_gather_values(ctx, result, 2);
 }
 
+static LLVMValueRef load_sample_pos(struct nir_to_llvm_context *ctx)
+{
+	LLVMValueRef values[2];
+
+	values[0] = emit_ffract(ctx, ctx->frag_pos[0]);
+	values[1] = emit_ffract(ctx, ctx->frag_pos[1]);
+	return build_gather_values(ctx, values, 2);
+}
+
 static LLVMValueRef visit_interp(struct nir_to_llvm_context *ctx,
 				 nir_intrinsic_instr *instr)
 {
@@ -2888,6 +2897,9 @@ static void visit_intrinsic(struct nir_to_llvm_context *ctx,
 	case nir_intrinsic_load_sample_id:
 		result = ctx->ancillary;
 		break;
+	case nir_intrinsic_load_sample_pos:
+		result = load_sample_pos(ctx);
+		break;
 	case nir_intrinsic_load_front_face:
 		result = ctx->front_face;
 		break;