diff options
| author | Roland Scheidegger <sroland@vmware.com> | 2010-10-08 20:57:50 +0200 |
|---|---|---|
| committer | Roland Scheidegger <sroland@vmware.com> | 2010-10-09 00:36:38 +0200 |
| commit | 99ade19e6e0dc9f5a4507bdcd7fb9704ca6c1df5 (patch) | |
| tree | 6cd3554845ffd4829bbf3312ea0a471757a47b8b /src/gallium/auxiliary/gallivm | |
| parent | 1e17e0c4ffc0f1d1b9170c5574606172998c8917 (diff) | |
gallivm: optimize some tex wrap mode calculations a bit
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.
Diffstat (limited to 'src/gallium/auxiliary/gallivm')
| -rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c index 90fd99067b..29adb57928 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c @@ -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); |