docs/features/core/datablocks/id_type.md

@@ -183,5 +183,48 @@ To add a new `IDTypeInfo` you need to:
       for object).
 2.  Add the `extern` declaration of the new `IDType` in
     `BKE_idtype.h`.
-3.  Register the new `IDTypeInfo` in `id_type_init()` of
-    `idtype.cc`.
+3. `idtype.cc`:
+   - Register the new `IDTypeInfo` in `id_type_init()`.
+   - Add a new `case` to `BKE_idtype_idcode_to_idfilter()`
+   - Add a new `case` to `BKE_idtype_idcode_to_index()`
+   - Add a new `case` to `BKE_idtype_idcode_from_index()`
+
+Additionally, there are some other areas in the source code where a reference to
+the new type might be added:
+
+4. `lib_query.cc`: in `BKE_library_id_can_use_filter_id()`.
+5. `blenkernel/intern/main.cc`:
+  - `which_libbase()`
+  - `set_listbasepointers()`
+6. `readfile.c`: in `dataname()`
+7. `BLT_translation.h`: add a `#define BLT_I18NCONTEXT_ID...` line
+8. Dependency graph handling: `deg_builder_nodes.h`, `deg_builder_nodes.cc`,
+   `deg_builder_relations.h`, and `deg_builder_relations.cc`,
+9. `editors/interface/interface_icons.cc` in `UI_icon_from_idcode()`
+10. `editors/interface/interface_templates.cc` in `template_id_browse_tip()`
+11. `editors/render/render_opengl.cc` in `gather_frames_to_render_for_id()`
+12. Outliner support in `editors/space_outliner`:
+  - `outliner_intern.hh`: `TREESTORE_ID_TYPE`
+  - `outliner_draw.cc`: `tree_element_get_icon_from_id()`
+  - `outliner_tools.cc`: `get_element_operation_type()`
+  - `tree_element_id.cc`: `TreeElementID::create_from_id()`
+13. Filtering:
+  - `DNA_ID.h`: add a `#define FILTER_ID_...` line and add it to `FILTER_ID_ALL`.
+  - `DNA_ID.h`: add an entry to `eID_Index`
+  - `rna_space.cc`: add to `rna_enum_space_file_id_filter_categories`
+14. `DNA_ID_enums.h`: add to `enum ID_Type`
+15. If your DNA definition has default values in `DNA_..._defaults.h`, add this to`dna_defaults.c`:
+  - add a `SDNA_DEFAULT_DECL_STRUCT(...)` line for each struct that has defaults.
+  - add a `SDNA_DEFAULT_DECL(...)` line to `DNA_default_table()` for each such struct.
+16. If you want to have RNA support:
+  - `makesrna.cc`: add an entry to `PROCESS_ITEMS` for your RNA definition file.
+  - `rna_ID.cc`: add to `rna_enum_id_type_items`, `rna_enum_id_type_filter_items`, `RNA_type_to_ID_code()`, `rna_ID_update_tag()`
+  - `rna_internal.hh`:
+    - add declaration of your RNA definition entry function (`void RNA_def_yourtype(BlenderRNA *brna);`)
+    - add declaration for the `bpy.data.yourdata` collection (`void RNA_def_main_yourdata(BlenderRNA *brna, PropertyRNA *cprop);`)
+  - `rna_main.cc`:
+    - add a `RNA_MAIN_LISTBASE_FUNCS_DEF(yourdata)` line.
+    - add your type to the `RNA_def_main()` function.
+  - `rna_main_api.cc`: add these functions:
+    - `static YourType *rna_Main_yourdata_new(Main *bmain, const char *name)`
+    - `void RNA_def_main_yourdata(BlenderRNA *brna, PropertyRNA *cprop)`