Fix T47788: Symmetrize flips multi-res data

Symmetrize was unusable with multi-res data,
add an option for the bmesh operator not to flip the multi-res depth.

1 files changed, 10 insertions, 2 deletions

diff --git a/source/blender/bmesh/intern/bmesh_polygon.c b/source/blender/bmesh/intern/bmesh_polygon.c
index 40f6078dc0b..62b29e61d08 100644
--- a/source/blender/bmesh/intern/bmesh_polygon.c
+++ b/source/blender/bmesh/intern/bmesh_polygon.c
@@ -702,12 +702,20 @@ void BM_face_calc_center_mean_vcos(
  * Reverses the winding of a face.
  * \note This updates the calculated normal.
  */
-void BM_face_normal_flip(BMesh *bm, BMFace *f)
+void BM_face_normal_flip_ex(
+        BMesh *bm, BMFace *f,
+        const int cd_loop_mdisp_offset, const bool use_loop_mdisp_flip)
 {
-	bmesh_loop_reverse(bm, f);
+	bmesh_loop_reverse(bm, f, cd_loop_mdisp_offset, use_loop_mdisp_flip);
 	negate_v3(f->no);
 }
 
+void BM_face_normal_flip(BMesh *bm, BMFace *f)
+{
+	const int cd_loop_mdisp_offset = CustomData_get_offset(&bm->ldata, CD_MDISPS);
+	BM_face_normal_flip_ex(bm, f, cd_loop_mdisp_offset, true);
+}
+
 /* detects if two line segments cross each other (intersects).
  * note, there could be more winding cases then there needs to be. */
 static bool line_crosses_v2f(const float v1[2], const float v2[2], const float v3[2], const float v4[2])