Blender Git Commit Log

First steps towards a 2-pass builder system.

Idea is to separate the construction of nodes from the declaration of
relations between them. This gives a cleaner structure and allows better
error handling.

Two "builder" classes define the API for each build pass. This way the
context variables (graph) can be accessed during building without having
to pass them explicitly to every function.

Specifying nodes in the relations pass works using keys rather than
direct node pointers. This way the builder can perform error handling
if one or both ends of the relation don't exist. Keys also don't require
all the details necessary for actual construction of nodes
(e.g. operation callback functions, description strings). This avoids
redundant or conflicting information in graph->get_node calls and
simplifies the code.

Old build code has been moved to a (not included) source file
depsgraph_build_deprecated.c to make porting more manageable.