use XrSessionCreated schedule to init the Views

Signed-off-by: Schmarni <marnistromer@gmail.com>

crates/bevy_openxr/src/openxr/render.rs

@@ -10,8 +10,11 @@ use bevy::{
     transform::TransformSystem,
 };
 use bevy_mod_xr::{
-    camera::{XrCamera, XrProjection},
+    camera::{XrCamera, XrProjection, XrViewInit},
-    session::{XrFirst, XrHandleEvents, XrPreDestroySession, XrRenderSet, XrRootTransform},
+    session::{
+        XrFirst, XrHandleEvents, XrPreDestroySession, XrRenderSet, XrRootTransform,
+        XrSessionCreated,
+    },
     spaces::XrPrimaryReferenceSpace,
 };
 use openxr::ViewStateFlags;
@@ -55,16 +58,19 @@ impl Plugin for OxrRenderPlugin {
             (
                 wait_frame.run_if(should_run_frame_loop),
                 update_cameras.run_if(should_run_frame_loop),
-                if self.spawn_cameras {
-                    init_views::<true>
-                } else {
-                    init_views::<false>
-                }
-                .run_if(resource_added::<OxrSession>),
             )
                 .chain()
                 .in_set(XrHandleEvents::FrameLoop),
         )
+        .add_systems(
+            XrSessionCreated,
+            if self.spawn_cameras {
+                init_views::<true>
+            } else {
+                init_views::<false>
+            }
+            .in_set(XrViewInit),
+        )
         .add_systems(
             PostUpdate,
             (locate_views, update_views)

crates/bevy_xr/src/camera.rs

@@ -7,7 +7,7 @@ use bevy::ecs::reflect::ReflectComponent;
 use bevy::ecs::schedule::IntoSystemConfigs;
 use bevy::math::{Mat4, Vec3A};
 use bevy::pbr::{PbrPlugin, PbrProjectionPlugin};
-use bevy::prelude::Projection;
+use bevy::prelude::{Projection, SystemSet};
 use bevy::reflect::std_traits::ReflectDefault;
 use bevy::reflect::Reflect;
 use bevy::render::camera::{CameraProjection, CameraProjectionPlugin};
@@ -38,6 +38,9 @@ impl Plugin for XrCameraPlugin {
     }
 }
 
+#[derive(Clone, Copy, Default, PartialEq, Eq, Debug, Hash, SystemSet)]
+pub struct XrViewInit;
+
 #[derive(Debug, Clone, Reflect, ExtractComponent)]
 #[reflect(Component, Default)]
 pub struct XrProjection {