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, 3 insertions, 3 deletions

diff --git a/source/blender/blenkernel/intern/rigidbody.c b/source/blender/blenkernel/intern/rigidbody.c
index 6b4cddb05f2..ffc6bc8d7a3 100644
--- a/source/blender/blenkernel/intern/rigidbody.c
+++ b/source/blender/blenkernel/intern/rigidbody.c
@@ -404,7 +404,7 @@ static rbCollisionShape *rigidbody_get_shape_trimesh_from_mesh(Object *ob)
     const MVert *mvert = BKE_mesh_verts(mesh);
     totvert = mesh->totvert;
     looptri = BKE_mesh_runtime_looptri_ensure(mesh);
-    tottri = mesh->runtime.looptris.len;
+    tottri = BKE_mesh_runtime_looptri_len(mesh);
     const MLoop *mloop = BKE_mesh_loops(mesh);
 
     /* sanity checking - potential case when no data will be present */
@@ -679,7 +679,7 @@ void BKE_rigidbody_calc_volume(Object *ob, float *r_vol)
         const MVert *mvert = BKE_mesh_verts(mesh);
         totvert = mesh->totvert;
         lt = BKE_mesh_runtime_looptri_ensure(mesh);
-        tottri = mesh->runtime.looptris.len;
+        tottri = BKE_mesh_runtime_looptri_len(mesh);
         const MLoop *mloop = BKE_mesh_loops(mesh);
 
         if (totvert > 0 && tottri > 0) {
@@ -753,7 +753,7 @@ void BKE_rigidbody_calc_center_of_mass(Object *ob, float r_center[3])
         const MVert *mvert = BKE_mesh_verts(mesh);
         totvert = mesh->totvert;
         looptri = BKE_mesh_runtime_looptri_ensure(mesh);
-        tottri = mesh->runtime.looptris.len;
+        tottri = BKE_mesh_runtime_looptri_len(mesh);
         const MLoop *mloop = BKE_mesh_loops(mesh);
 
         if (totvert > 0 && tottri > 0) {