[Mesa-dev] [PATCH] r600g: Honour destination operand's writemask in the SCS implementation.

[Tilman Sauerbeck]

Signed-off-by: Tilman Sauerbeck <tilman at code-monkey.de>
---
 src/gallium/drivers/r600/r600_shader.c |   49 +++++++++++++++++--------------
 1 files changed, 27 insertions(+), 22 deletions(-)

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index 4da6850..7e51db6 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -932,32 +932,37 @@ static int tgsi_scs(struct r600_shader_ctx *ctx)
 
 
 	/* dst.x = COS */
-	memset(&alu, 0, sizeof(struct r600_bc_alu));
-	alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_COS);
-	r = tgsi_dst(ctx, &inst->Dst[0], 0, &alu.dst);
-	if (r)
-		return r;
+	if (inst->Dst[0].Register.WriteMask & TGSI_WRITEMASK_X) {
+		memset(&alu, 0, sizeof(struct r600_bc_alu));
+		alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_COS);
+		r = tgsi_dst(ctx, &inst->Dst[0], 0, &alu.dst);
+		if (r)
+			return r;
 
-	alu.src[0].sel = ctx->temp_reg;
-	alu.src[0].chan = 0;
-	alu.last = 1;
-	r = r600_bc_add_alu(ctx->bc, &alu);
-	if (r)
-		return r;
+		alu.src[0].sel = ctx->temp_reg;
+		alu.src[0].chan = 0;
+		alu.last = 1;
+		r = r600_bc_add_alu(ctx->bc, &alu);
+		if (r)
+			return r;
+	}
 
 	/* dst.y = SIN */
-	memset(&alu, 0, sizeof(struct r600_bc_alu));
-	alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_SIN);
-	r = tgsi_dst(ctx, &inst->Dst[0], 1, &alu.dst);
-	if (r)
-		return r;
+	if (inst->Dst[0].Register.WriteMask & TGSI_WRITEMASK_Y) {
+		memset(&alu, 0, sizeof(struct r600_bc_alu));
+		alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_SIN);
+		r = tgsi_dst(ctx, &inst->Dst[0], 1, &alu.dst);
+		if (r)
+			return r;
+
+		alu.src[0].sel = ctx->temp_reg;
+		alu.src[0].chan = 0;
+		alu.last = 1;
+		r = r600_bc_add_alu(ctx->bc, &alu);
+		if (r)
+			return r;
+	}
 
-	alu.src[0].sel = ctx->temp_reg;
-	alu.src[0].chan = 0;
-	alu.last = 1;
-	r = r600_bc_add_alu(ctx->bc, &alu);
-	if (r)
-		return r;
 	return 0;
 }
 
-- 
1.7.2.3