radeonsi: move default tess level constant buffer to RW buffers

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

5 files changed, 35 insertions, 10 deletions

diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index 57bc7d3eb8a..e6a4f3d28e3 100644
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -1280,6 +1280,25 @@ static void declare_system_value(
 		break;
 	}
 
+	case TGSI_SEMANTIC_DEFAULT_TESSOUTER_SI:
+	case TGSI_SEMANTIC_DEFAULT_TESSINNER_SI:
+	{
+		LLVMValueRef buf, slot, val[4];
+		int i, offset;
+
+		slot = lp_build_const_int32(gallivm, SI_HS_CONST_DEFAULT_TESS_LEVELS);
+		buf = LLVMGetParam(ctx->radeon_bld.main_fn, SI_PARAM_RW_BUFFERS);
+		buf = build_indexed_load_const(ctx, buf, slot);
+		offset = decl->Semantic.Name == TGSI_SEMANTIC_DEFAULT_TESSINNER_SI ? 4 : 0;
+
+		for (i = 0; i < 4; i++)
+			val[i] = buffer_load_const(gallivm->builder, buf,
+						   lp_build_const_int32(gallivm, (offset + i) * 4),
+						   ctx->f32);
+		value = lp_build_gather_values(gallivm, val, 4);
+		break;
+	}
+
 	case TGSI_SEMANTIC_PRIMID:
 		value = get_primitive_id(&radeon_bld->soa.bld_base, 0);
 		break;
diff --git a/src/gallium/drivers/radeonsi/si_shader.h b/src/gallium/drivers/radeonsi/si_shader.h
index 857a6829e01..0470890be7f 100644
--- a/src/gallium/drivers/radeonsi/si_shader.h
+++ b/src/gallium/drivers/radeonsi/si_shader.h
@@ -210,6 +210,12 @@ enum {
 	SI_NUM_PARAMS = SI_PARAM_POS_FIXED_PT + 9, /* +8 for COLOR[0..1] */
 };
 
+/* SI-specific system values. */
+enum {
+	TGSI_SEMANTIC_DEFAULT_TESSOUTER_SI = TGSI_SEMANTIC_COUNT,
+	TGSI_SEMANTIC_DEFAULT_TESSINNER_SI,
+};
+
 struct si_shader;
 
 /* A shader selector is a gallium CSO and contains shader variants and
diff --git a/src/gallium/drivers/radeonsi/si_state.c b/src/gallium/drivers/radeonsi/si_state.c
index 2e488fe089e..3f74176d041 100644
--- a/src/gallium/drivers/radeonsi/si_state.c
+++ b/src/gallium/drivers/radeonsi/si_state.c
@@ -3395,8 +3395,8 @@ static void si_set_tess_state(struct pipe_context *ctx,
 			       (void*)array, sizeof(array),
 			       &cb.buffer_offset);
 
-	ctx->set_constant_buffer(ctx, PIPE_SHADER_TESS_CTRL,
-				 SI_DRIVER_STATE_CONST_BUF, &cb);
+	si_set_constant_buffer(sctx, &sctx->rw_buffers,
+			       SI_HS_CONST_DEFAULT_TESS_LEVELS, &cb);
 	pipe_resource_reference(&cb.buffer, NULL);
 }
 
diff --git a/src/gallium/drivers/radeonsi/si_state.h b/src/gallium/drivers/radeonsi/si_state.h
index 2b566bf25a0..80a5983f2ef 100644
--- a/src/gallium/drivers/radeonsi/si_state.h
+++ b/src/gallium/drivers/radeonsi/si_state.h
@@ -178,6 +178,7 @@ enum {
 	SI_VS_STREAMOUT_BUF2,
 	SI_VS_STREAMOUT_BUF3,
 
+	SI_HS_CONST_DEFAULT_TESS_LEVELS,
 	SI_VS_CONST_CLIP_PLANES,
 	SI_PS_CONST_POLY_STIPPLE,
 	SI_PS_CONST_SAMPLE_POSITIONS,
diff --git a/src/gallium/drivers/radeonsi/si_state_shaders.c b/src/gallium/drivers/radeonsi/si_state_shaders.c
index 5c923cb80c1..d02ce8f74dd 100644
--- a/src/gallium/drivers/radeonsi/si_state_shaders.c
+++ b/src/gallium/drivers/radeonsi/si_state_shaders.c
@@ -1804,7 +1804,7 @@ static void si_init_tess_factor_ring(struct si_context *sctx)
  */
 static void si_generate_fixed_func_tcs(struct si_context *sctx)
 {
-	struct ureg_src const0, const1;
+	struct ureg_src outer, inner;
 	struct ureg_dst tessouter, tessinner;
 	struct ureg_program *ureg = ureg_create(TGSI_PROCESSOR_TESS_CTRL);
 
@@ -1813,17 +1813,16 @@ static void si_generate_fixed_func_tcs(struct si_context *sctx)
 
 	assert(!sctx->fixed_func_tcs_shader.cso);
 
-	ureg_DECL_constant2D(ureg, 0, 1, SI_DRIVER_STATE_CONST_BUF);
-	const0 = ureg_src_dimension(ureg_src_register(TGSI_FILE_CONSTANT, 0),
-				    SI_DRIVER_STATE_CONST_BUF);
-	const1 = ureg_src_dimension(ureg_src_register(TGSI_FILE_CONSTANT, 1),
-				    SI_DRIVER_STATE_CONST_BUF);
+	outer = ureg_DECL_system_value(ureg,
+				       TGSI_SEMANTIC_DEFAULT_TESSOUTER_SI, 0);
+	inner = ureg_DECL_system_value(ureg,
+				       TGSI_SEMANTIC_DEFAULT_TESSINNER_SI, 0);
 
 	tessouter = ureg_DECL_output(ureg, TGSI_SEMANTIC_TESSOUTER, 0);
 	tessinner = ureg_DECL_output(ureg, TGSI_SEMANTIC_TESSINNER, 0);
 
-	ureg_MOV(ureg, tessouter, const0);
-	ureg_MOV(ureg, tessinner, const1);
+	ureg_MOV(ureg, tessouter, outer);
+	ureg_MOV(ureg, tessinner, inner);
 	ureg_END(ureg);
 
 	sctx->fixed_func_tcs_shader.cso =