Geometry Nodes: support instancing collections

The Point Instance node can instance entire collections now.
Before, only individual collections were supported.

Randomly selecting objects from the collection on a per point basis
is not support, yet.

Last part of D9739.

Ref T82372.

1 files changed, 15 insertions, 1 deletions

diff --git a/source/blender/blenkernel/BKE_geometry_set.h b/source/blender/blenkernel/BKE_geometry_set.h
index 026f4d39d51..87bb96be145 100644
--- a/source/blender/blenkernel/BKE_geometry_set.h
+++ b/source/blender/blenkernel/BKE_geometry_set.h
@@ -26,16 +26,30 @@ extern "C" {
 
 struct Object;
 struct GeometrySet;
+struct Collection;
 
 void BKE_geometry_set_free(struct GeometrySet *geometry_set);
 
 bool BKE_geometry_set_has_instances(const struct GeometrySet *geometry_set);
 
+typedef enum InstancedDataType {
+  INSTANCE_DATA_TYPE_OBJECT = 0,
+  INSTANCE_DATA_TYPE_COLLECTION = 1,
+} InstancedDataType;
+
+typedef struct InstancedData {
+  InstancedDataType type;
+  union {
+    struct Object *object;
+    struct Collection *collection;
+  } data;
+} InstancedData;
+
 int BKE_geometry_set_instances(const struct GeometrySet *geometry_set,
                                float (**r_positions)[3],
                                float (**r_rotations)[3],
                                float (**r_scales)[3],
-                               struct Object ***r_objects);
+                               struct InstancedData **r_instanced_data);
 
 #ifdef __cplusplus
 }