Blender Git Loki

Ported over the various operation nodes to c++ classes.

Make use of boost for some utility types (hash tables).

This could be replaced by own classes if we want to avoid boost
dependency (boost is included centrally in a util header).

Removed unused GHash includes.

Constructor/Destructor for Depsgraph struct.

Register the main node and component types, fixed a few syntax errors.

Replaced op_hash in component nodes by unordered_map.

Replaced bone_hash by unordered_map in PoseComponentDepsNode.

Replaced id_hash container in Depsgraph with a unordered_map.

NOTE: had to disable the subgraph registration in the id_hash, since
this is not a proper IDDepsNode. Not sure how this is supposed to work.

Replaced the component hash table in IDDepsNode with unordered_map.

We can't use GHash reliably because it only stores void * and all
dynamic type info (vtable) gets lost. This means we cannot retrieve a
node from such hash tables and then call a virtual function on it.

Pose and Bone component classes.

Fix for invalid template arguments: const char * cannot be used for
templates.

Instead made a little helper struct TypeInfo inside DepsNode, which
can be created statically using simple macros (just to avoid repetitive
syntax). This typeinfo is then copied by factories and used to
initialize nodes.

Default constructor/destructor for DepsNode.

Implemented a factory method 'create_node' to replace the current
DEG_create_node function.

Virtual copy function for DepsNode.
This must be implemented by subclasses to replace the copy_data callback.

Added component subtypes, which use the plain ComponentDepsNode base
without further modification.

Changed the 2 constructor variants of nodes to a virtual init and copy
function.

This has the advantage of being inheritable by subclasses, other than
constructors which have to be redefined every time and then do nested
constructor calls for base classes (constructor inheritance has actually
been added in C++11, but is not widely available).

Replaced the free_node callback in typeinfo with calls to 'delete'.

add_to_graph/remove_from_graph virtual methods for DepsNode and a
Root node implementation for testing.

Reimplemented methods for ID and Subgraph deps nodes.

Porting to C++:
* Redeclared source files as cpp sources
* Added explicit void* to type conversions (C++ requirement)
* Wrapped C includes in extern "C"