[Mesa-dev] [PATCH 3/3] r600g: implement edge flags

[Marek Olšák]

From: Marek Olšák <marek.olsak at amd.com>

---
 src/gallium/drivers/r600/evergreen_state.c |  1 +
 src/gallium/drivers/r600/r600_shader.c     | 55 +++++++++++++++++++++++++++---
 src/gallium/drivers/r600/r600_shader.h     |  1 +
 3 files changed, 53 insertions(+), 4 deletions(-)

diff --git a/src/gallium/drivers/r600/evergreen_state.c b/src/gallium/drivers/r600/evergreen_state.c
index 22a4d49..1cabf19 100644
--- a/src/gallium/drivers/r600/evergreen_state.c
+++ b/src/gallium/drivers/r600/evergreen_state.c
@@ -3303,6 +3303,7 @@ void evergreen_update_vs_state(struct pipe_context *ctx, struct r600_pipe_shader
 		S_02881C_VS_OUT_CCDIST1_VEC_ENA((rshader->clip_dist_write & 0xF0) != 0) |
 		S_02881C_VS_OUT_MISC_VEC_ENA(rshader->vs_out_misc_write) |
 		S_02881C_USE_VTX_POINT_SIZE(rshader->vs_out_point_size) |
+		S_02881C_USE_VTX_EDGE_FLAG(rshader->vs_out_edgeflag) |
 		S_02881C_USE_VTX_VIEWPORT_INDX(rshader->vs_out_viewport) |
 		S_02881C_USE_VTX_RENDER_TARGET_INDX(rshader->vs_out_layer);
 }
diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index 38c68e4..fabadd8 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -286,6 +286,7 @@ struct r600_shader_ctx {
 	int					colors_used;
 	boolean                 clip_vertex_write;
 	unsigned                cv_output;
+	unsigned		edgeflag_output;
 	int					fragcoord_input;
 	int					native_integers;
 	int					next_ring_offset;
@@ -490,10 +491,11 @@ static int r600_spi_sid(struct r600_shader_io * io)
 	 * semantic indices, so we'll use 0 for them.
 	 */
 	if (name == TGSI_SEMANTIC_POSITION ||
-		name == TGSI_SEMANTIC_PSIZE ||
-		name == TGSI_SEMANTIC_LAYER ||
-		name == TGSI_SEMANTIC_VIEWPORT_INDEX ||
-		name == TGSI_SEMANTIC_FACE)
+	    name == TGSI_SEMANTIC_PSIZE ||
+	    name == TGSI_SEMANTIC_EDGEFLAG ||
+	    name == TGSI_SEMANTIC_LAYER ||
+	    name == TGSI_SEMANTIC_VIEWPORT_INDEX ||
+	    name == TGSI_SEMANTIC_FACE)
 		index = 0;
 	else {
 		if (name == TGSI_SEMANTIC_GENERIC) {
@@ -624,6 +626,11 @@ static int tgsi_declaration(struct r600_shader_ctx *ctx)
 				ctx->shader->vs_out_misc_write = 1;
 				ctx->shader->vs_out_point_size = 1;
 				break;
+			case TGSI_SEMANTIC_EDGEFLAG:
+				ctx->shader->vs_out_misc_write = 1;
+				ctx->shader->vs_out_edgeflag = 1;
+				ctx->edgeflag_output = i;
+				break;
 			case TGSI_SEMANTIC_VIEWPORT_INDEX:
 				ctx->shader->vs_out_misc_write = 1;
 				ctx->shader->vs_out_viewport = 1;
@@ -1162,6 +1169,35 @@ out_err:
 	return r;
 }
 
+static void convert_edgeflag_to_int(struct r600_shader_ctx *ctx)
+{
+	struct r600_bytecode_alu alu;
+	unsigned reg;
+
+	if (!ctx->shader->vs_out_edgeflag)
+		return;
+
+	reg = ctx->shader->output[ctx->edgeflag_output].gpr;
+
+	/* clamp(x, 0, 1) */
+	memset(&alu, 0, sizeof(alu));
+	alu.op = ALU_OP1_MOV;
+	alu.src[0].sel = reg;
+	alu.dst.sel = reg;
+	alu.dst.write = 1;
+	alu.dst.clamp = 1;
+	alu.last = 1;
+	r600_bytecode_add_alu(ctx->bc, &alu);
+
+	memset(&alu, 0, sizeof(alu));
+	alu.op = ALU_OP1_FLT_TO_INT;
+	alu.src[0].sel = reg;
+	alu.dst.sel = reg;
+	alu.dst.write = 1;
+	alu.last = 1;
+	r600_bytecode_add_alu(ctx->bc, &alu);
+}
+
 static int generate_gs_copy_shader(struct r600_context *rctx,
 				   struct r600_pipe_shader *gs,
 				   struct pipe_stream_output_info *so)
@@ -1918,6 +1954,8 @@ static int r600_shader_from_tgsi(struct r600_context *rctx,
 	    so.num_outputs && !use_llvm)
 		emit_streamout(&ctx, &so);
 
+	convert_edgeflag_to_int(&ctx);
+
 	if (ring_outputs) {
 		if (key.vs_as_es)
 			emit_gs_ring_writes(&ctx, FALSE);
@@ -1953,6 +1991,15 @@ static int r600_shader_from_tgsi(struct r600_context *rctx,
 					output[j].type = V_SQ_CF_ALLOC_EXPORT_WORD0_SQ_EXPORT_POS;
 					pos_emitted = true;
 					break;
+				case TGSI_SEMANTIC_EDGEFLAG:
+					output[j].array_base = 61;
+					output[j].swizzle_x = 7;
+					output[j].swizzle_y = 0;
+					output[j].swizzle_z = 7;
+					output[j].swizzle_w = 7;
+					output[j].type = V_SQ_CF_ALLOC_EXPORT_WORD0_SQ_EXPORT_POS;
+					pos_emitted = true;
+					break;
 				case TGSI_SEMANTIC_LAYER:
 					output[j].array_base = 61;
 					output[j].swizzle_x = 7;
diff --git a/src/gallium/drivers/r600/r600_shader.h b/src/gallium/drivers/r600/r600_shader.h
index 519d0aa..ab9f1f0 100644
--- a/src/gallium/drivers/r600/r600_shader.h
+++ b/src/gallium/drivers/r600/r600_shader.h
@@ -64,6 +64,7 @@ struct r600_shader {
 	boolean			vs_out_point_size;
 	boolean			vs_out_layer;
 	boolean			vs_out_viewport;
+	boolean			vs_out_edgeflag;
 	boolean			has_txq_cube_array_z_comp;
 	boolean			uses_tex_buffers;
 	boolean                 gs_prim_id_input;
-- 
1.8.3.2