gallivm: fix tex offsets with mirror repeat linear

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 <[email protected]>
Reviewed-by: Jose Fonseca <[email protected]>

1 files changed, 5 insertions, 4 deletions

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
index 125505eeb4b..26bfa0d2677 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
@@ -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);