Fix T79324: Crash when changing View Layer while VR session runs

Proper handling of View Layers for the VR session was never implemented.
Now the View Layer of the VR session follows the window the session was
started in.
Note that if this window is closed, we fallback to another window. This
is done to avoid the overhead it would take to maintain a separate
depsgraph for the VR view. Instead we always share some already visible
View Layer (and hence the depsgraph).

1 files changed, 2 insertions, 1 deletions

diff --git a/source/blender/windowmanager/intern/wm_operators.c b/source/blender/windowmanager/intern/wm_operators.c
index d1f65b6271b..e14b59d77b2 100644
--- a/source/blender/windowmanager/intern/wm_operators.c
+++ b/source/blender/windowmanager/intern/wm_operators.c
@@ -3722,6 +3722,7 @@ static int wm_xr_session_toggle_exec(bContext *C, wmOperator *UNUSED(op))
 {
   Main *bmain = CTX_data_main(C);
   wmWindowManager *wm = CTX_wm_manager(C);
+  wmWindow *win = CTX_wm_window(C);
   View3D *v3d = CTX_wm_view3d(C);
 
   /* Lazy-create xr context - tries to dynlink to the runtime, reading active_runtime.json. */
@@ -3730,7 +3731,7 @@ static int wm_xr_session_toggle_exec(bContext *C, wmOperator *UNUSED(op))
   }
 
   v3d->runtime.flag |= V3D_RUNTIME_XR_SESSION_ROOT;
-  wm_xr_session_toggle(wm, wm_xr_session_update_screen_on_exit_cb);
+  wm_xr_session_toggle(wm, win, wm_xr_session_update_screen_on_exit_cb);
   wm_xr_session_update_screen(bmain, &wm->xr);
 
   WM_event_add_notifier(C, NC_WM | ND_XR_DATA_CHANGED, NULL);