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/draw/engines/workbench/workbench_engine.c b/source/blender/draw/engines/workbench/workbench_engine.c
index 36a980bd506..fecdad5802c 100644
--- a/source/blender/draw/engines/workbench/workbench_engine.c
+++ b/source/blender/draw/engines/workbench/workbench_engine.c
@@ -14,6 +14,7 @@
 #include "BLI_alloca.h"
 
 #include "BKE_editmesh.h"
+#include "BKE_mesh_runtime.h"
 #include "BKE_modifier.h"
 #include "BKE_object.h"
 #include "BKE_paint.h"
@@ -231,7 +232,7 @@ static void workbench_cache_hair_populate(WORKBENCH_PrivateData *wpd,
 
 static const CustomData *workbench_mesh_get_loop_custom_data(const Mesh *mesh)
 {
-  if (mesh->runtime.wrapper_type == ME_WRAPPER_TYPE_BMESH) {
+  if (BKE_mesh_wrapper_type(mesh) == ME_WRAPPER_TYPE_BMESH) {
     BLI_assert(mesh->edit_mesh != NULL);
     BLI_assert(mesh->edit_mesh->bm != NULL);
     return &mesh->edit_mesh->bm->ldata;
@@ -241,7 +242,7 @@ static const CustomData *workbench_mesh_get_loop_custom_data(const Mesh *mesh)
 
 static const CustomData *workbench_mesh_get_vert_custom_data(const Mesh *mesh)
 {
-  if (mesh->runtime.wrapper_type == ME_WRAPPER_TYPE_BMESH) {
+  if (BKE_mesh_wrapper_type(mesh) == ME_WRAPPER_TYPE_BMESH) {
     BLI_assert(mesh->edit_mesh != NULL);
     BLI_assert(mesh->edit_mesh->bm != NULL);
     return &mesh->edit_mesh->bm->vdata;