Assets: add global `bke::AssetLibraryService` class

Add `blender::bke::AssetLibraryService` class that acts like a
blendfile-scoped singleton. It's allocated upon the first call to
`BKE_asset_library_load` and destroyed in the LOAD-PRE handler.

The `AssetLibraryService` ensures that edits to asset catalogs are not
lost when the asset browser editor closes (or even reloads). Instead,
the `AssetLibrary` pointers it owns are kept around as long as the blend
file is open.

Reviewed By: Severin

Maniphest Tasks: T92151

Differential Revision: https://developer.blender.org/D12885

1 files changed, 7 insertions, 1 deletions

diff --git a/source/blender/blenkernel/BKE_asset_library.hh b/source/blender/blenkernel/BKE_asset_library.hh
index 419df2a1061..b8b4b0f8447 100644
--- a/source/blender/blenkernel/BKE_asset_library.hh
+++ b/source/blender/blenkernel/BKE_asset_library.hh
@@ -33,9 +33,15 @@
 
 namespace blender::bke {
 
+/**
+ * AssetLibrary provides access to an asset library's data.
+ * For now this is only for catalogs, later this can be expanded to indexes/caches/more.
+ */
 struct AssetLibrary {
   std::unique_ptr<AssetCatalogService> catalog_service;
 
+  ~AssetLibrary();
+
   void load(StringRefNull library_root_directory);
 
   /**
@@ -52,7 +58,7 @@ struct AssetLibrary {
   void on_save_post(struct Main *, struct PointerRNA **pointers, const int num_pointers);
 
  private:
-  bCallbackFuncStore on_save_callback_store_;
+  bCallbackFuncStore on_save_callback_store_{};
 };
 
 }  // namespace blender::bke