XR: Add runtime window area for XR events

This adds an offscreen View3D window area for the VR view in order to
execute XR events/operators in the proper context. The area is created
as runtime data before XR events are dispatched and set as the active
area during XR event handling.

Since the area is runtime-only, it will not be saved in files and since
the area is offscreen, it will not interfere with regular window areas.
The area is removed with the rest of the XR runtime data on exit, file
read, or when stopping the VR session.

Note: This also adds internal types (EVT_DATA_XR, EVT_XR_ACTION) and
structs (wmXrActionData) for XR events.

Reviewed By: Severin

Differential Revision: https://developer.blender.org/D12472

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/editors/include/ED_screen.h b/source/blender/editors/include/ED_screen.h
index 60ef3e740c6..0de6907e677 100644
--- a/source/blender/editors/include/ED_screen.h
+++ b/source/blender/editors/include/ED_screen.h
@@ -178,6 +178,12 @@ void ED_area_update_region_sizes(struct wmWindowManager *wm,
                                  struct wmWindow *win,
                                  struct ScrArea *area);
 bool ED_area_has_shared_border(struct ScrArea *a, struct ScrArea *b);
+ScrArea *ED_area_offscreen_create(struct wmWindowManager *wm,
+                                  struct wmWindow *win,
+                                  eSpace_Type space_type);
+void ED_area_offscreen_free(struct wmWindowManager *wm,
+                            struct wmWindow *win,
+                            struct ScrArea *area);
 
 ScrArea *ED_screen_areas_iter_first(const struct wmWindow *win, const bScreen *screen);
 ScrArea *ED_screen_areas_iter_next(const bScreen *screen, const ScrArea *area);