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, 4 insertions, 4 deletions

diff --git a/source/blender/blenkernel/intern/paint.cc b/source/blender/blenkernel/intern/paint.cc
index fbb7642c067..d45ce776b64 100644
--- a/source/blender/blenkernel/intern/paint.cc
+++ b/source/blender/blenkernel/intern/paint.cc
@@ -1743,7 +1743,7 @@ static void sculpt_update_object(
 
   ss->hide_poly = (bool *)CustomData_get_layer_named(&me->pdata, CD_PROP_BOOL, ".hide_poly");
 
-  ss->subdiv_ccg = me_eval->runtime.subdiv_ccg;
+  ss->subdiv_ccg = me_eval->runtime->subdiv_ccg;
 
   PBVH *pbvh = BKE_sculpt_object_pbvh_ensure(depsgraph, ob);
   BLI_assert(pbvh == ss->pbvh);
@@ -2258,7 +2258,7 @@ PBVH *BKE_sculpt_object_pbvh_ensure(Depsgraph *depsgraph, Object *ob)
     if (BKE_pbvh_type(pbvh) == PBVH_GRIDS) {
       Object *object_eval = DEG_get_evaluated_object(depsgraph, ob);
       Mesh *mesh_eval = static_cast<Mesh *>(object_eval->data);
-      SubdivCCG *subdiv_ccg = mesh_eval->runtime.subdiv_ccg;
+      SubdivCCG *subdiv_ccg = mesh_eval->runtime->subdiv_ccg;
       if (subdiv_ccg != nullptr) {
         BKE_sculpt_bvh_update_from_ccg(pbvh, subdiv_ccg);
       }
@@ -2277,8 +2277,8 @@ PBVH *BKE_sculpt_object_pbvh_ensure(Depsgraph *depsgraph, Object *ob)
   else {
     Object *object_eval = DEG_get_evaluated_object(depsgraph, ob);
     Mesh *mesh_eval = static_cast<Mesh *>(object_eval->data);
-    if (mesh_eval->runtime.subdiv_ccg != nullptr) {
-      pbvh = build_pbvh_from_ccg(ob, mesh_eval->runtime.subdiv_ccg, respect_hide);
+    if (mesh_eval->runtime->subdiv_ccg != nullptr) {
+      pbvh = build_pbvh_from_ccg(ob, mesh_eval->runtime->subdiv_ccg, respect_hide);
     }
     else if (ob->type == OB_MESH) {
       Mesh *me_eval_deform = object_eval->runtime.mesh_deform_eval;