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gallivm: optimize some tex wrap mode calculations a bit

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Sometimes coords are clamped to positive numbers before doing conversion
to int, or clamped to 0 afterwards, in this case can use itrunc
instead of ifloor which is easier. This is only the case for nearest
calculations unfortunately, except linear MIRROR_CLAMP_TO_EDGE which
for the same reason can use a unsigned float build context so the
ifloor_fract helper can reduce this to itrunc in the ifloor helper itself.
This commit is contained in:
Roland Scheidegger 2010-10-08 20:57:50 +02:00
parent 1e17e0c4ff
commit 99ade19e6e
1 changed files with 11 additions and 6 deletions
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17
src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
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@ -364,7 +364,8 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
{
LLVMValueRef min, max;
struct lp_build_context abs_coord_bld = bld->coord_bld;
abs_coord_bld.type.sign = FALSE;
coord = lp_build_abs(coord_bld, coord);
if (bld->static_state->normalized_coords) {
@ -380,7 +381,7 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
coord = lp_build_sub(coord_bld, coord, half);
/* convert to int, compute lerp weight */
lp_build_ifloor_fract(coord_bld, coord, &coord0, &weight);
lp_build_ifloor_fract(&abs_coord_bld, coord, &coord0, &weight);
coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one);
}
break;
@ -465,7 +466,8 @@ lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld,
}
/* floor */
icoord = lp_build_ifloor(coord_bld, coord);
/* use itrunc instead since we clamp to 0 anyway */
icoord = lp_build_itrunc(coord_bld, coord);
/* clamp to [0, length - 1]. */
icoord = lp_build_clamp(int_coord_bld, icoord, int_coord_bld->zero,
@ -499,7 +501,8 @@ lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld,
assert(bld->static_state->normalized_coords);
coord = lp_build_mul(coord_bld, coord, length_f);
icoord = lp_build_ifloor(coord_bld, coord);
/* itrunc == ifloor here */
icoord = lp_build_itrunc(coord_bld, coord);
/* clamp to [0, length - 1] */
icoord = lp_build_min(int_coord_bld, icoord, length_minus_one);
@ -514,7 +517,8 @@ lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld,
coord = lp_build_mul(coord_bld, coord, length_f);
}
icoord = lp_build_ifloor(coord_bld, coord);
/* itrunc == ifloor here */
icoord = lp_build_itrunc(coord_bld, coord);
/* clamp to [0, length - 1] */
icoord = lp_build_min(int_coord_bld, icoord, length_minus_one);
@ -528,7 +532,8 @@ lp_build_sample_wrap_nearest(struct lp_build_sample_context *bld,
coord = lp_build_mul(coord_bld, coord, length_f);
}
icoord = lp_build_ifloor(coord_bld, coord);
/* itrunc == ifloor here */
icoord = lp_build_itrunc(coord_bld, coord);
/* clamp to [0, length] */
icoord = lp_build_min(int_coord_bld, icoord, length);