Layers: use IDProperty and override collection properties system

First this replace a custom data struct with IDProperty, and use
IDProperty group merge and copying functions. Which means that a collection
property setting is only created if necessary.

This implements the "Layer Collection settings" override system, as
suggested in the "Override Manifesto" document.

The core is working, with Scene, LayerCollection and Object using a
single IDProperty to store all the render settings data. Next step is to
migrate this to depsgraph.

Note: Clay engine "ssao_samples" was hardcoded to 32 for now. It will come
back as part of "Workspace Settings" later.

Many thanks for Bastien Montagne for the help with the UI template
nightmare ;)

Differential Revision: https://developer.blender.org/D2563

1 files changed, 9 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_ui_api.c b/source/blender/makesrna/intern/rna_ui_api.c
index 46775af21db..6ef4bc6a371 100644
--- a/source/blender/makesrna/intern/rna_ui_api.c
+++ b/source/blender/makesrna/intern/rna_ui_api.c
@@ -888,6 +888,15 @@ void RNA_api_ui_layout(StructRNA *srna)
 	parm = RNA_def_pointer(func, "item", "KeyMapItem", "", "");
 	RNA_def_parameter_flags(parm, PROP_NEVER_NULL, PARM_REQUIRED | PARM_RNAPTR);
 
+	func = RNA_def_function(srna, "template_override_property", "uiTemplateOverrideProperty");
+	parm = RNA_def_pointer(func, "collection_render_overrides", "AnyType", "", "");
+	RNA_def_parameter_flags(parm, PROP_NEVER_NULL, PARM_REQUIRED | PARM_RNAPTR);
+	parm = RNA_def_pointer(func, "scene_collection_properties", "AnyType", "", "");
+	RNA_def_parameter_flags(parm, PROP_NEVER_NULL, PARM_REQUIRED | PARM_RNAPTR);
+	parm = RNA_def_string(func, "property", NULL, 0, "", "Identifier of property in collection_properties");
+	RNA_def_parameter_flags(parm, 0, PARM_REQUIRED);
+	parm = RNA_def_string(func, "custom_template", NULL, 0, "", "Optional template to use for property");
+
 	func = RNA_def_function(srna, "template_component_menu", "uiTemplateComponentMenu");
 	RNA_def_function_ui_description(func, "Item. Display expanded property in a popup menu");
 	parm = RNA_def_pointer(func, "data", "AnyType", "", "Data from which to take property");