diff options
| author | Roland Scheidegger <[email protected]> | 2015-09-01 16:29:17 -0600 |
|---|---|---|
| committer | Brian Paul <[email protected]> | 2015-09-01 16:29:17 -0600 |
| commit | 17542086174ed1c2ea47f3b9b5917ce478442819 (patch) | |
| tree | f8754752636da1035e5ecfcfd1b698991b2aaf4b /src/gallium/auxiliary/util | |
| parent | fec4f5de67b22a7048266fb7e57f49fe6fc3744a (diff) | |
gallium/util: fix returning empty box for rectangle intersection
These functions deal with inclusive coordinates, hence a 0/0/0/0 rect
returned when there's no intersection doesn't actually represent an empty
rectangle. Hence return 0/-1/0/-1 instead.
This fixes some problems in llvmpipe with empty scissor rects (which up
to now didn't really matter because while the intersect test returned the
wrong result all pixels were scissored away later anyway).
Diffstat (limited to 'src/gallium/auxiliary/util')
| -rw-r--r-- | src/gallium/auxiliary/util/u_rect.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/gallium/auxiliary/util/u_rect.h b/src/gallium/auxiliary/util/u_rect.h index dea1e1ecff3..221d9188730 100644 --- a/src/gallium/auxiliary/util/u_rect.h +++ b/src/gallium/auxiliary/util/u_rect.h @@ -87,7 +87,12 @@ u_rect_possible_intersection(const struct u_rect *a, u_rect_find_intersection(a,b); } else { - b->x0 = b->x1 = b->y0 = b->y1 = 0; + /* + * Note the u_rect_xx tests deal with inclusive coordinates + * hence all-zero would not be an empty box. + */ + b->x0 = b->y0 = 0; + b->x1 = b->y1 = -1; } } |