From 5ced167336d49ef42e96e205c72d3935ff302a7e Mon Sep 17 00:00:00 2001
From: Jacques Lucke <jacques@blender.org>
Date: Fri, 11 Dec 2020 17:47:58 +0100
Subject: Geometry Nodes: support collection sockets

Part of D9739.
---
 .../blenkernel/BKE_persistent_data_handle.hh       | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'source/blender/blenkernel')

diff --git a/source/blender/blenkernel/BKE_persistent_data_handle.hh b/source/blender/blenkernel/BKE_persistent_data_handle.hh
index 42a853886d7..bbee09c7bf4 100644
--- a/source/blender/blenkernel/BKE_persistent_data_handle.hh
+++ b/source/blender/blenkernel/BKE_persistent_data_handle.hh
@@ -27,6 +27,7 @@
 
 #include "DNA_ID.h"
 
+struct Collection;
 struct Object;
 
 namespace blender::bke {
@@ -82,6 +83,11 @@ class PersistentObjectHandle : public PersistentIDHandle {
   using PersistentIDHandle::PersistentIDHandle;
 };
 
+class PersistentCollectionHandle : public PersistentIDHandle {
+  friend PersistentDataHandleMap;
+  using PersistentIDHandle::PersistentIDHandle;
+};
+
 class PersistentDataHandleMap {
  private:
   Map<int32_t, ID *> id_by_handle_;
@@ -107,6 +113,12 @@ class PersistentDataHandleMap {
     return PersistentObjectHandle(handle);
   }
 
+  PersistentCollectionHandle lookup(Collection *collection) const
+  {
+    const int handle = handle_by_id_.lookup_default((ID *)collection, -1);
+    return PersistentCollectionHandle(handle);
+  }
+
   ID *lookup(const PersistentIDHandle &handle) const
   {
     ID *id = id_by_handle_.lookup_default(handle.handle_, nullptr);
@@ -124,6 +136,18 @@ class PersistentDataHandleMap {
     }
     return (Object *)id;
   }
+
+  Collection *lookup(const PersistentCollectionHandle &handle) const
+  {
+    ID *id = this->lookup((const PersistentIDHandle &)handle);
+    if (id == nullptr) {
+      return nullptr;
+    }
+    if (GS(id->name) != ID_GR) {
+      return nullptr;
+    }
+    return (Collection *)id;
+  }
 };
 
 }  // namespace blender::bke
-- 
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