[Mesa-dev] [PATCH 3/3] r600g: fix LIT to handle src==dst properly

[Vadim Girlin]

Current LIT implementation uses dst components for storing temp
results, possibly overwriting still needed values (depends on the
swizzles).
This patch uses temp reg for one of such cases (found in etqw) and
fixes "LIT R.z, R.xyzz".

Tested on evergreen. Fixes some etqw-demo rendering glitches when 
"Lighting" is set to "High" in the settings.

Signed-off-by: Vadim Girlin <vadimgirlin at gmail.com>
---
 src/gallium/drivers/r600/r600_shader.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index 0995dd5..0268108 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -1366,7 +1366,9 @@ static int tgsi_lit(struct r600_shader_ctx *ctx)
 			memset(&alu, 0, sizeof(struct r600_bc_alu));
 			alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_LOG_CLAMPED);
 			r600_bc_src(&alu.src[0], &ctx->src[0], 1);
-			tgsi_dst(ctx, &inst->Dst[0], 2, &alu.dst);
+			alu.dst.sel = ctx->temp_reg;
+			alu.dst.chan = 2;
+			alu.dst.write = 1;
 			alu.last = 1;
 			r = r600_bc_add_alu(ctx->bc, &alu);
 			if (r)
-- 
1.7.5.4