Mesh: skip conversion from edit-mesh to mesh in edit-mode

This resolves a performance regression in 2.8x where every edit-mode
update performed an edit-mesh to mesh conversion.

Now the conversion will be lazily initialized if/when it's required.

New BKE_mesh_wrapper_* functions abstract over mesh data access.
Currently only edit-mesh and regular meshes are supported.
In the future sub-surface meshes may be supported too.

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/bmesh/intern/bmesh_query.h b/source/blender/bmesh/intern/bmesh_query.h
index aaf8191c5db..7e07059d4d8 100644
--- a/source/blender/bmesh/intern/bmesh_query.h
+++ b/source/blender/bmesh/intern/bmesh_query.h
@@ -142,6 +142,16 @@ float BM_loop_calc_face_normal(const BMLoop *l, float r_normal[3]) ATTR_NONNULL(
 float BM_loop_calc_face_normal_safe(const BMLoop *l, float r_normal[3]) ATTR_NONNULL();
 float BM_loop_calc_face_normal_safe_ex(const BMLoop *l, const float epsilon, float r_normal[3])
     ATTR_NONNULL();
+float BM_loop_calc_face_normal_safe_vcos_ex(const BMLoop *l,
+                                            const float normal_fallback[3],
+                                            float const (*vertexCos)[3],
+                                            const float epsilon_sq,
+                                            float r_normal[3]) ATTR_NONNULL();
+float BM_loop_calc_face_normal_safe_vcos(const BMLoop *l,
+                                         const float normal_fallback[3],
+                                         float const (*vertexCos)[3],
+                                         float r_normal[3]) ATTR_NONNULL();
+
 void BM_loop_calc_face_direction(const BMLoop *l, float r_normal[3]);
 void BM_loop_calc_face_tangent(const BMLoop *l, float r_tangent[3]);