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nv50: handle TGSI_SEMANTIC_FACE

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This commit is contained in:
Christoph Bumiller 2009-11-01 14:15:30 +01:00
parent 496c9eaacf
commit 5de8f97440
1 changed files with 25 additions and 0 deletions
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25
src/gallium/drivers/nv50/nv50_program.c
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@ -2463,6 +2463,23 @@ load_interpolant(struct nv50_pc *pc, struct nv50_reg *reg)
emit_interp(pc, reg, iv, mode);
}
/* The face input is always at v[255] (varying space), with a
* value of 0 for back-facing, and 0xffffffff for front-facing.
*/
static void
load_frontfacing(struct nv50_pc *pc, struct nv50_reg *a)
{
struct nv50_reg *one = alloc_immd(pc, 1.0f);
assert(a->rhw == -1);
alloc_reg(pc, a); /* do this before rhw is set */
a->rhw = 255;
load_interpolant(pc, a);
emit_bitop2(pc, a, a, one, TGSI_OPCODE_AND);
FREE(one);
}
static boolean
nv50_program_tx_prep(struct nv50_pc *pc)
{
@ -2607,6 +2624,8 @@ nv50_program_tx_prep(struct nv50_pc *pc)
int rid, aid;
unsigned n = 0, m = pc->attr_nr - flat_nr;
pc->allow32 = TRUE;
int base = (TGSI_SEMANTIC_POSITION ==
p->info.input_semantic_name[0]) ? 0 : 1;
@ -2635,6 +2654,12 @@ nv50_program_tx_prep(struct nv50_pc *pc)
p->cfg.io[n].hw = rid = aid;
i = p->cfg.io[n].id_fp;
if (p->info.input_semantic_name[n] ==
TGSI_SEMANTIC_FACE) {
load_frontfacing(pc, &pc->attr[i * 4]);
continue;
}
for (c = 0; c < 4; ++c) {
if (!pc->attr[i * 4 + c].acc)
continue;