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, 1 insertions, 1 deletions

diff --git a/source/blender/blenkernel/intern/subdiv_ccg.cc b/source/blender/blenkernel/intern/subdiv_ccg.cc
index 8ccf2c9cec5..bf09be444b1 100644
--- a/source/blender/blenkernel/intern/subdiv_ccg.cc
+++ b/source/blender/blenkernel/intern/subdiv_ccg.cc
@@ -615,7 +615,7 @@ Mesh *BKE_subdiv_to_ccg_mesh(Subdiv *subdiv,
     return nullptr;
   }
   Mesh *result = BKE_mesh_new_nomain_from_template(coarse_mesh, 0, 0, 0, 0, 0);
-  result->runtime.subdiv_ccg = subdiv_ccg;
+  result->runtime->subdiv_ccg = subdiv_ccg;
   return result;
 }