Python handlers: Pass depsgraph to events where it makes sense

The goal is to make it possible to access evaluated datablocks at a
corresponding context. For example, be able to check evaluated state
if an object used for rendering.

Allows to write scripts in a safe manner for T63548 and T60094.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D5726

1 files changed, 39 insertions, 2 deletions

diff --git a/source/blender/blenkernel/intern/callbacks.c b/source/blender/blenkernel/intern/callbacks.c
index cbecba2efe1..367fed818af 100644
--- a/source/blender/blenkernel/intern/callbacks.c
+++ b/source/blender/blenkernel/intern/callbacks.c
@@ -25,18 +25,55 @@
 
 #include "MEM_guardedalloc.h"
 
+#include "RNA_types.h"
+#include "RNA_access.h"
+
 static ListBase callback_slots[BKE_CB_EVT_TOT] = {{NULL}};
 
-void BKE_callback_exec(struct Main *bmain, struct ID *self, eCbEvent evt)
+void BKE_callback_exec(struct Main *bmain,
+                       struct PointerRNA **pointers,
+                       const int num_pointers,
+                       eCbEvent evt)
 {
   ListBase *lb = &callback_slots[evt];
   bCallbackFuncStore *funcstore;
 
   for (funcstore = lb->first; funcstore; funcstore = funcstore->next) {
-    funcstore->func(bmain, self, funcstore->arg);
+    funcstore->func(bmain, pointers, num_pointers, funcstore->arg);
   }
 }
 
+void BKE_callback_exec_null(struct Main *bmain, eCbEvent evt)
+{
+  BKE_callback_exec(bmain, NULL, 0, evt);
+}
+
+void BKE_callback_exec_id(struct Main *bmain, struct ID *id, eCbEvent evt)
+{
+  PointerRNA id_ptr;
+  RNA_id_pointer_create(id, &id_ptr);
+
+  PointerRNA *pointers[1] = {&id_ptr};
+
+  BKE_callback_exec(bmain, pointers, 1, evt);
+}
+
+void BKE_callback_exec_id_depsgraph(struct Main *bmain,
+                                    struct ID *id,
+                                    struct Depsgraph *depsgraph,
+                                    eCbEvent evt)
+{
+  PointerRNA id_ptr;
+  RNA_id_pointer_create(id, &id_ptr);
+
+  PointerRNA depsgraph_ptr;
+  RNA_pointer_create(NULL, &RNA_Depsgraph, depsgraph, &depsgraph_ptr);
+
+  PointerRNA *pointers[2] = {&id_ptr, &depsgraph_ptr};
+
+  BKE_callback_exec(bmain, pointers, 2, evt);
+}
+
 void BKE_callback_add(bCallbackFuncStore *funcstore, eCbEvent evt)
 {
   ListBase *lb = &callback_slots[evt];