Alembic: store a pointer to the object reader in the cache modifiers and

constraints.

This avoids traversing the archive everytime object data is needed and
gives an overall consistent ~2x speedup here with files containing
between 136 and 500 Alembic objects. Also this somewhat nicely de-
duplicates code between data creation (upon import) and data streaming
(modifiers and constraints).

The only worying part is what happens when a CacheFile is deleted and/or
has its path changed. For now, we traverse the whole scene and for each
object using the CacheFile we free the pointer and NULL-ify it (see
BKE_cachefile_clean), but at some point this should be re-considered and
make use of the dependency graph.

1 files changed, 4 insertions, 7 deletions

diff --git a/source/blender/alembic/intern/abc_mesh.h b/source/blender/alembic/intern/abc_mesh.h
index 41abe78f75f..66e6585a3d3 100644
--- a/source/blender/alembic/intern/abc_mesh.h
+++ b/source/blender/alembic/intern/abc_mesh.h
@@ -102,6 +102,8 @@ public:
 
 	void readObjectData(Main *bmain, float time);
 
+	DerivedMesh *read_derivedmesh(DerivedMesh *dm, const float time, int read_flag);
+
 private:
 	void readFaceSetsSample(Main *bmain, Mesh *mesh, size_t poly_start,
 	                        const Alembic::AbcGeom::ISampleSelector &sample_sel);
@@ -126,6 +128,7 @@ public:
 	bool valid() const;
 
 	void readObjectData(Main *bmain, float time);
+	DerivedMesh *read_derivedmesh(DerivedMesh *dm, const float time, int read_flag);
 };
 
 void read_subd_sample(ImportSettings *settings,
@@ -135,16 +138,10 @@ void read_subd_sample(ImportSettings *settings,
 
 /* ************************************************************************** */
 
-namespace utils {
-
-void mesh_add_verts(struct Mesh *mesh, size_t len);
-
-}
-
 void read_mverts(MVert *mverts,
                  const Alembic::AbcGeom::P3fArraySamplePtr &positions,
                  const Alembic::AbcGeom::N3fArraySamplePtr &normals);
 
-CDStreamConfig create_config(Mesh *mesh);
+CDStreamConfig get_config(DerivedMesh *dm);
 
 #endif  /* __ABC_MESH_H__ */