Merge pull request #81 from Schmarni-Dev/crash_on_session_create_no_i…

…nstance_fix

fix panic when trying to start a session without an instance

src/xr_init/mod.rs

@@ -176,12 +176,12 @@ pub(crate) struct CleanupXrData;
 fn start_xr_session(
  mut commands: Commands,
  mut status: ResMut<XrStatus>,
- instance: Res<XrInstance>,
+ instance: Option<Res<XrInstance>>,
  primary_window: Query<&RawHandleWrapper, With<PrimaryWindow>>,
- setup_info: NonSend<OXrSessionSetupInfo>,
- render_device: Res<RenderDevice>,
- render_adapter: Res<RenderAdapter>,
- render_instance: Res<RenderInstance>,
+ setup_info: Option<NonSend<OXrSessionSetupInfo>>,
+ render_device: Option<Res<RenderDevice>>,
+ render_adapter: Option<Res<RenderAdapter>>,
+ render_instance: Option<Res<RenderInstance>>,
 ) {
  info!("start Session");
  match *status {
@@ -199,6 +199,23 @@ fn start_xr_session(
  return;
  }
  }
+ let (
+ Some(instance),
+ Some(setup_info),
+ Some(render_device),
+ Some(render_adapter),
+ Some(render_instance),
+ ) = (
+ instance,
+ setup_info,
+ render_device,
+ render_adapter,
+ render_instance,
+ )
+ else {
+ error!("Missing resources after passing status check");
+ return;
+ };
  let (
  xr_session,
  xr_resolution,