Simulations: Embed simulation node tree in simulation data block

This adds an embedded node tree to the simulation data block dna.
The UI in the `Simulation Editor` has been updated to show a list
of simulation data blocks, instead of individual node trees.

The new `SpaceNodeEditor.simulation` property wraps the existing
`SpaceNodeEditor.id` property. It allows scripts to get and set
the simulation data block that is being edited.

Reviewers: brecht, mont29

Differential Revision: https://developer.blender.org/D7301

1 files changed, 5 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_simulation.c b/source/blender/makesrna/intern/rna_simulation.c
index 2ffda8a4ea8..789ea299feb 100644
--- a/source/blender/makesrna/intern/rna_simulation.c
+++ b/source/blender/makesrna/intern/rna_simulation.c
@@ -34,11 +34,16 @@
 static void rna_def_simulation(BlenderRNA *brna)
 {
   StructRNA *srna;
+  PropertyRNA *prop;
 
   srna = RNA_def_struct(brna, "Simulation", "ID");
   RNA_def_struct_ui_text(srna, "Simulation", "Simulation data-block");
   RNA_def_struct_ui_icon(srna, ICON_PHYSICS); /* TODO: Use correct icon. */
 
+  prop = RNA_def_property(srna, "node_tree", PROP_POINTER, PROP_NONE);
+  RNA_def_property_pointer_sdna(prop, NULL, "nodetree");
+  RNA_def_property_ui_text(prop, "Node Tree", "Node tree defining the simulation");
+
   /* common */
   rna_def_animdata_common(srna);
 }