radv/ac: setup tess rings on compiler side.

This just sets up the necessary pointers on the compiler
side for the rings needed for tessellation.

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

src/amd/common/ac_nir_to_llvm.c

@@ -92,6 +92,8 @@ struct nir_to_llvm_context {
 
 	LLVMValueRef esgs_ring;
 	LLVMValueRef gsvs_ring;
+	LLVMValueRef hs_ring_tess_offchip;
+	LLVMValueRef hs_ring_tess_factor;
 
 	LLVMValueRef prim_mask;
 	LLVMValueRef sample_positions;
@@ -432,6 +434,8 @@ static void create_function(struct nir_to_llvm_context *ctx)
 	/* until we sort out scratch/global buffers always assign ring offsets for gs/vs/es */
 	if (ctx->stage == MESA_SHADER_GEOMETRY ||
 	    ctx->stage == MESA_SHADER_VERTEX ||
+	    ctx->stage == MESA_SHADER_TESS_CTRL ||
+	    ctx->stage == MESA_SHADER_TESS_EVAL ||
 	    ctx->is_gs_copy_shader)
 		need_ring_offsets = true;
 
@@ -4758,7 +4762,8 @@ static void ac_llvm_finalize_module(struct nir_to_llvm_context * ctx)
 static void
 ac_setup_rings(struct nir_to_llvm_context *ctx)
 {
-	if (ctx->stage == MESA_SHADER_VERTEX && ctx->options->key.vs.as_es) {
+	if ((ctx->stage == MESA_SHADER_VERTEX && ctx->options->key.vs.as_es) ||
+	    (ctx->stage == MESA_SHADER_TESS_EVAL && ctx->options->key.tes.as_es)) {
 		ctx->esgs_ring = ac_build_indexed_load_const(&ctx->ac, ctx->ring_offsets, LLVMConstInt(ctx->i32, RING_ESGS_VS, false));
 	}
 
@@ -4779,6 +4784,12 @@ ac_setup_rings(struct nir_to_llvm_context *ctx)
 
 		ctx->gsvs_ring = LLVMBuildBitCast(ctx->builder, ctx->gsvs_ring, ctx->v16i8, "");
 	}
+
+	if (ctx->stage == MESA_SHADER_TESS_CTRL ||
+	    ctx->stage == MESA_SHADER_TESS_EVAL) {
+		ctx->hs_ring_tess_offchip = ac_build_indexed_load_const(&ctx->ac, ctx->ring_offsets, LLVMConstInt(ctx->i32, RING_HS_TESS_OFFCHIP, false));
+		ctx->hs_ring_tess_factor = ac_build_indexed_load_const(&ctx->ac, ctx->ring_offsets, LLVMConstInt(ctx->i32, RING_HS_TESS_FACTOR, false));
+	}
 }
 
 static

src/amd/common/ac_nir_to_llvm.h

@@ -107,6 +107,8 @@ enum ac_ud_index {
 #define RING_ESGS_GS 2
 #define RING_GSVS_VS 3
 #define RING_GSVS_GS 4
+#define RING_HS_TESS_FACTOR 5
+#define RING_HS_TESS_OFFCHIP 6
 
 // Match MAX_SETS from radv_descriptor_set.h
 #define AC_UD_MAX_SETS MAX_SETS