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gallivm: fix tex offsets with mirror repeat linear

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Can't see why anyone would ever want to use this, but it was clearly broken.
This fixes the piglit texwrap offset test using this combination.

Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
This commit is contained in:
Roland Scheidegger 2015-10-22 23:58:50 +02:00
parent 71ff5af5dd
commit 205a3ce5c1
1 changed files with 5 additions and 4 deletions
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9
src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
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@ -405,16 +405,17 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld,
break;
case PIPE_TEX_WRAP_MIRROR_REPEAT:
if (offset) {
offset = lp_build_int_to_float(coord_bld, offset);
offset = lp_build_div(coord_bld, offset, length_f);
coord = lp_build_add(coord_bld, coord, offset);
}
/* compute mirror function */
coord = lp_build_coord_mirror(bld, coord);
/* scale coord to length */
coord = lp_build_mul(coord_bld, coord, length_f);
coord = lp_build_sub(coord_bld, coord, half);
if (offset) {
offset = lp_build_int_to_float(coord_bld, offset);
coord = lp_build_add(coord_bld, coord, offset);
}
/* convert to int, compute lerp weight */
lp_build_ifloor_fract(coord_bld, coord, &coord0, &weight);