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 <airlied@redhat.com>
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
index 125505e..26bfa0d 100644 (file)
--- 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);