Merge branch 'blender-v2.93-release'

source/blender/depsgraph/intern/eval/deg_eval_runtime_backup.cc

@@ -33,6 +33,7 @@ namespace blender::deg {
 
 RuntimeBackup::RuntimeBackup(const Depsgraph *depsgraph)
     : have_backup(false),
+      id_data({.py_instance = nullptr}),
       animation_backup(depsgraph),
       scene_backup(depsgraph),
       sound_backup(depsgraph),
@@ -51,6 +52,8 @@ void RuntimeBackup::init_from_id(ID *id)
   }
   have_backup = true;
 
+  id_data.py_instance = id->py_instance;
+
   animation_backup.init_from_id(id);
 
   const ID_Type id_type = GS(id->name);
@@ -89,6 +92,8 @@ void RuntimeBackup::restore_to_id(ID *id)
     return;
   }
 
+  id->py_instance = id_data.py_instance;
+
   animation_backup.restore_to_id(id);
 
   const ID_Type id_type = GS(id->name);

source/blender/depsgraph/intern/eval/deg_eval_runtime_backup.h

@@ -58,6 +58,11 @@ class RuntimeBackup {
    * copy-on-write mechanism. */
   bool have_backup;
 
+  /* Struct members of the ID pointer. */
+  struct {
+    void *py_instance;
+  } id_data;
+
   AnimationBackup animation_backup;
   SceneBackup scene_backup;
   SoundBackup sound_backup;

source/blender/render/intern/engine.c

@@ -143,12 +143,9 @@ RenderEngine *RE_engine_create(RenderEngineType *type)
 static void engine_depsgraph_free(RenderEngine *engine)
 {
   if (engine->depsgraph) {
-    /* Need GPU context since this might free GPU buffers. This function can
-     * only be called from a render thread. We do not currently support
-     * persistent data with GPU contexts for that reason. */
+    /* Need GPU context since this might free GPU buffers. */
     const bool use_gpu_context = (engine->type->flag & RE_USE_GPU_CONTEXT);
     if (use_gpu_context) {
-      BLI_assert(!BLI_thread_is_main());
       DRW_render_context_enable(engine->re);
     }
 
@@ -623,8 +620,8 @@ RenderData *RE_engine_get_render_data(Render *re)
 
 bool RE_engine_use_persistent_data(RenderEngine *engine)
 {
-  /* See engine_depsgraph_free() for why preserving the depsgraph for
-   * re-renders is not supported with GPU contexts. */
+  /* Re-rendering is not supported with GPU contexts, since the GPU context
+   * is destroyed when the render thread exists. */
   return (engine->re->r.mode & R_PERSISTENT_DATA) && !(engine->type->flag & RE_USE_GPU_CONTEXT);
 }