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nv50: make FrontFacing -1 or +1

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This commit is contained in:
Christoph Bumiller 2010-08-31 19:09:15 +02:00
parent 917c79b384
commit 07fe7c2f02
1 changed files with 9 additions and 2 deletions
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11
src/gallium/drivers/nv50/nv50_tgsi_to_nc.c
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@ -964,6 +964,14 @@ bld_saved_input(struct bld_context *bld, unsigned i, unsigned c)
static struct nv_value *
bld_interpolate(struct bld_context *bld, unsigned mode, struct nv_value *val)
{
if (val->reg.id == 255) {
/* gl_FrontFacing: 0/~0 to -1.0/+1.0 */
val = bld_insn_1(bld, NV_OP_LINTERP, val);
val = bld_insn_2(bld, NV_OP_SHL, val, bld_imm_u32(bld, 31));
val->insn->src[0]->typecast = NV_TYPE_U32;
val = bld_insn_2(bld, NV_OP_XOR, val, bld_imm_f32(bld, -1.0f));
val->insn->src[0]->typecast = NV_TYPE_U32;
} else
if (mode & (NV50_INTERP_LINEAR | NV50_INTERP_FLAT))
val = bld_insn_1(bld, NV_OP_LINTERP, val);
else
@ -1029,9 +1037,8 @@ emit_fetch(struct bld_context *bld, const struct tgsi_full_instruction *insn,
} else {
assert(src->Dimension.Dimension == 0);
res = bld_insn_1(bld, NV_OP_LDA, res);
assert(res->reg.type == type);
}
assert(res->reg.type == type);
bld->saved_inputs[bld->ti->input_map[idx][swz]] = res;
break;
case TGSI_FILE_TEMPORARY: