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, 2 deletions

diff --git a/source/blender/editors/space_info/info_stats.cc b/source/blender/editors/space_info/info_stats.cc
index cac0dbb0067..e8b005b2b67 100644
--- a/source/blender/editors/space_info/info_stats.cc
+++ b/source/blender/editors/space_info/info_stats.cc
@@ -40,6 +40,7 @@
 #include "BKE_key.h"
 #include "BKE_layer.h"
 #include "BKE_main.h"
+#include "BKE_mesh.h"
 #include "BKE_object.h"
 #include "BKE_paint.h"
 #include "BKE_particle.h"
@@ -94,8 +95,8 @@ static bool stats_mesheval(const Mesh *me_eval, bool is_selected, SceneStats *st
 
   int totvert, totedge, totface, totloop;
 
-  const SubdivCCG *subdiv_ccg = me_eval->runtime.subdiv_ccg;
-  const SubsurfRuntimeData *subsurf_runtime_data = me_eval->runtime.subsurf_runtime_data;
+  const SubdivCCG *subdiv_ccg = me_eval->runtime->subdiv_ccg;
+  const SubsurfRuntimeData *subsurf_runtime_data = me_eval->runtime->subsurf_runtime_data;
 
   if (subdiv_ccg != nullptr) {
     BKE_subdiv_ccg_topology_counters(subdiv_ccg, &totvert, &totedge, &totface, &totloop);