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r600g: fix LIT to handle src==dst properly 

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@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Vadim Girlin 2011-06-17 23:02:01 +04:00 committed by Dave Airlie
parent 8ab1c5328b
commit 2fe39b46e7
1 changed files with 3 additions and 1 deletions
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4
src/gallium/drivers/r600/r600_shader.c
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@ -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)