Mesh: Move runtime data out of DNA

This commit replaces the `Mesh_Runtime` struct embedded in `Mesh`
with `blender::bke::MeshRuntime`. This has quite a few benefits:
- It's possible to use C++ types like `std::mutex`, `Array`,
  `BitVector`, etc. more easily
- Meshes saved in files are slightly smaller
- Copying and writing meshes is a bit more obvious without
  clearing of runtime data, etc.

The first is by far the most important. It will allows us to avoid a
bunch of manual memory management boilerplate that is error-prone and
annoying. It should also simplify future CoW improvements for runtime
data.

This patch doesn't change anything besides changing `mesh.runtime.data`
to `mesh.runtime->data`. The cleanups above will happen separately.

Differential Revision: https://developer.blender.org/D16180

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/blenkernel/intern/object_dupli.cc b/source/blender/blenkernel/intern/object_dupli.cc
index 306e508dc83..96da99af97e 100644
--- a/source/blender/blenkernel/intern/object_dupli.cc
+++ b/source/blender/blenkernel/intern/object_dupli.cc
@@ -423,8 +423,8 @@ static const Mesh *mesh_data_from_duplicator_object(Object *ob,
     /* Note that this will only show deformation if #eModifierMode_OnCage is enabled.
      * We could change this but it matches 2.7x behavior. */
     me_eval = BKE_object_get_editmesh_eval_cage(ob);
-    if ((me_eval == nullptr) || (me_eval->runtime.wrapper_type == ME_WRAPPER_TYPE_BMESH)) {
-      EditMeshData *emd = me_eval ? me_eval->runtime.edit_data : nullptr;
+    if ((me_eval == nullptr) || (me_eval->runtime->wrapper_type == ME_WRAPPER_TYPE_BMESH)) {
+      EditMeshData *emd = me_eval ? me_eval->runtime->edit_data : nullptr;
 
       /* Only assign edit-mesh in the case we can't use `me_eval`. */
       *r_em = em;