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, 7 insertions, 12 deletions

diff --git a/source/blender/blenkernel/BKE_mesh_runtime.h b/source/blender/blenkernel/BKE_mesh_runtime.h
index dfefe125a51..27e04c1a4de 100644
--- a/source/blender/blenkernel/BKE_mesh_runtime.h
+++ b/source/blender/blenkernel/BKE_mesh_runtime.h
@@ -9,6 +9,7 @@
  */
 
 //#include "BKE_customdata.h"  /* for eCustomDataMask */
+#include "BKE_mesh_types.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -26,21 +27,10 @@ struct Object;
 struct Scene;
 
 /**
- * \brief Initialize the runtime of the given mesh.
- *
- * Function expects that the runtime is already cleared.
- */
-void BKE_mesh_runtime_init_data(struct Mesh *mesh);
-/**
  * \brief Free all data (and mutexes) inside the runtime of the given mesh.
  */
 void BKE_mesh_runtime_free_data(struct Mesh *mesh);
-/**
- * Clear all pointers which we don't want to be shared on copying the datablock.
- * However, keep all the flags which defines what the mesh is (for example, that
- * it's deformed only, or that its custom data layers are out of date.)
- */
-void BKE_mesh_runtime_reset_on_copy(struct Mesh *mesh, int flag);
+
 int BKE_mesh_runtime_looptri_len(const struct Mesh *mesh);
 void BKE_mesh_runtime_looptri_recalc(struct Mesh *mesh);
 /**
@@ -66,6 +56,11 @@ void BKE_mesh_runtime_verttri_from_looptri(struct MVertTri *r_verttri,
                                            const struct MLoopTri *looptri,
                                            int looptri_num);
 
+/** \note Only used for access in C. */
+bool BKE_mesh_is_deformed_only(const struct Mesh *mesh);
+/** \note Only used for access in C. */
+eMeshWrapperType BKE_mesh_wrapper_type(const struct Mesh *mesh);
+
 /* NOTE: the functions below are defined in DerivedMesh.cc, and are intended to be moved
  * to a more suitable location when that file is removed.
  * They should also be renamed to use conventions from BKE, not old DerivedMesh.cc.