Depsgraph: Specify whether RNA path to be resolved as entry or exit

Makes it more explicit whether RNA property is used as a source
dependency for something else, or whether some other dependency
is being hooked up to evaluate that property.

1 files changed, 18 insertions, 3 deletions

diff --git a/source/blender/depsgraph/intern/depsgraph.h b/source/blender/depsgraph/intern/depsgraph.h
index 27dd27c923b..a816fcc32df 100644
--- a/source/blender/depsgraph/intern/depsgraph.h
+++ b/source/blender/depsgraph/intern/depsgraph.h
@@ -103,6 +103,20 @@ struct DepsRelation {
 	void unlink();
 };
 
+/* For queries which gives operation node or key defines whether we are
+ * interested in a result of the given property or whether we are linking some
+ * dependency to that property. */
+enum class RNAPointerSource {
+	/* Query will return pointer to an entry operation of component which is
+	 * responsible for evaluation of the given property. */
+	ENTRY,
+	/* Query will return pointer to an exit operation of component which is
+	 * responsible for evaluation of the given property.
+	 * More precisely, it will return operation at which the property is known
+	 * to be evaluated. */
+	EXIT,
+};
+
 /* ********* */
 /* Depsgraph */
 
@@ -125,9 +139,10 @@ struct Depsgraph {
 	 *              results in inner nodes being returned
 	 *
 	 * \return A node matching the required characteristics if it exists
-	 * or NULL if no such node exists in the graph
-	 */
-	DepsNode *find_node_from_pointer(const PointerRNA *ptr, const PropertyRNA *prop) const;
+	 * or NULL if no such node exists in the graph */
+	DepsNode *find_node_from_pointer(const PointerRNA *ptr,
+	                                 const PropertyRNA *prop,
+	                                 RNAPointerSource source) const;
 
 	TimeSourceDepsNode *add_time_source();
 	TimeSourceDepsNode *find_time_source() const;