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r600g: LIT: clamp negative src.y to 0

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Fixes https://bugs.freedesktop.org/show_bug.cgi?id=39083

Signed-off-by: Vadim Girlin <vadimgirlin@gmail.com>
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
This commit is contained in:
Vadim Girlin 2011-07-10 13:19:38 -04:00 • committed by Alex Deucher
parent d644a50dc3
commit f0a7e28e29
1 changed files with 24 additions and 5 deletions
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29
src/gallium/drivers/r600/r600_shader.c
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@ -1370,6 +1370,22 @@ static int tgsi_lit(struct r600_shader_ctx *ctx)
struct r600_bc_alu alu;
int r;
/* tmp.x = max(src.y, 0.0) */
memset(&alu, 0, sizeof(struct r600_bc_alu));
alu.inst = CTX_INST(V_SQ_ALU_WORD1_OP2_SQ_OP2_INST_MAX);
r600_bc_src(&alu.src[0], &ctx->src[0], 1);
alu.src[1].sel = V_SQ_ALU_SRC_0; /*0.0*/
alu.src[1].chan = 1;
alu.dst.sel = ctx->temp_reg;
alu.dst.chan = 0;
alu.dst.write = 1;
alu.last = 1;
r = r600_bc_add_alu(ctx->bc, &alu);
if (r)
return r;
if (inst->Dst[0].Register.WriteMask & (1 << 2))
{
int chan;
@ -1378,11 +1394,13 @@ static int tgsi_lit(struct r600_shader_ctx *ctx)
if (ctx->bc->chip_class == CAYMAN) {
for (i = 0; i < 3; i++) {
/* dst.z = log(src.y) */
/* tmp.z = log(tmp.x) */
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], i, &alu.dst);
alu.src[0].sel = ctx->temp_reg;
alu.src[0].chan = 0;
alu.dst.sel = ctx->temp_reg;
alu.dst.chan = i;
if (i == 2) {
alu.dst.write = 1;
alu.last = 1;
@ -1394,10 +1412,11 @@ static int tgsi_lit(struct r600_shader_ctx *ctx)
return r;
}
} else {
/* tmp.z = log(src.y) */
/* tmp.z = log(tmp.x) */
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);
alu.src[0].sel = ctx->temp_reg;
alu.src[0].chan = 0;
alu.dst.sel = ctx->temp_reg;
alu.dst.chan = 2;
alu.dst.write = 1;