radv: fix interp at sample code.

Interp at sample needs to use the center, since the sample
positions it retrieves are relative to the center.

This fixes a bunch of CTS tests with multisample_interpolation.

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

diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index dfe2732..6fd2a0c 100644 (file)
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -3556,12 +3556,10 @@ static LLVMValueRef visit_interp(struct nir_to_llvm_context *ctx,
                location = INTERP_CENTROID;
                break;
        case nir_intrinsic_interp_var_at_sample:
-               location = INTERP_SAMPLE;
-               src0 = get_src(ctx, instr->src[0]);
-               break;
        case nir_intrinsic_interp_var_at_offset:
                location = INTERP_CENTER;
                src0 = get_src(ctx, instr->src[0]);
+               break;
        default:
                break;
        }