Assets: Initial Asset List as part of the Asset System design

Implements a basic, WIP version of the asset list. This is needed to
give the asset view UI template asset reading and displaying
functionality.

See:
* Asset System: Data Storage, Reading & UI Access - https://developer.blender.org/T88184

Especially the asset list internals should change. It uses the
File/Asset Browser's `FileList` API, which isn't really meant for access
from outside the File Browser. But as explained in T88184, it does a lot
of the stuff we currently need, so we (Sybren Stüvel and I) decided to
go this route for now. Work on a file-list rewrite which integrates well
with the asset system started in the `asset-system-filelist` branch.

Further includes:
* Operator to reload the asset list.
* New `bpy.types.AssetHandle.get_full_library_path()` function, which
  gets the full path of the asset via the asset-list.
* Changes to preview loading to prevent the preview loading job to run
  eternally for asset views. File Browsers have this issue too, but
  should be fixed separately.

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_asset_types.h b/source/blender/makesdna/DNA_asset_types.h
index 9b17bca2ab6..3907c158573 100644
--- a/source/blender/makesdna/DNA_asset_types.h
+++ b/source/blender/makesdna/DNA_asset_types.h
@@ -20,6 +20,7 @@
 
 #pragma once
 
+#include "DNA_defs.h"
 #include "DNA_listBase.h"
 
 #ifdef __cplusplus
@@ -36,6 +37,16 @@ typedef struct AssetTag {
   char name[64]; /* MAX_NAME */
 } AssetTag;
 
+#
+#
+typedef struct AssetFilterSettings {
+  /** Tags to match against. These are newly allocated, and compared against the
+   * #AssetMetaData.tags.
+   * TODO not used and doesn't do anything yet. */
+  ListBase tags;     /* AssetTag */
+  uint64_t id_types; /* rna_enum_id_type_filter_items */
+} AssetFilterSettings;
+
 /**
  * \brief The meta-data of an asset.
  * By creating and giving this for a data-block (#ID.asset_data), the data-block becomes an asset.