change scheduling

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

crates/bevy_openxr/examples/sessions.rs

@@ -0,0 +1,69 @@
+//! A simple 3D scene with light shining over a cube sitting on a plane.
+
+use bevy::prelude::*;
+use bevy_openxr::add_xr_plugins;
+
+fn main() {
+    App::new()
+        .add_plugins(add_xr_plugins(DefaultPlugins))
+        .add_plugins(bevy_xr_utils::hand_gizmos::HandGizmosPlugin)
+        .add_systems(Startup, setup)
+        .add_systems(Update, handle_input)
+        .run();
+}
+
+fn handle_input(
+    keys: Res<ButtonInput<KeyCode>>,
+    mut end: EventWriter<bevy_xr::session::EndXrSession>,
+    mut destroy: EventWriter<bevy_xr::session::DestroyXrSession>,
+    mut begin: EventWriter<bevy_xr::session::BeginXrSession>,
+    mut create: EventWriter<bevy_xr::session::CreateXrSession>,
+) {
+    if keys.just_pressed(KeyCode::KeyE) {
+        end.send_default();
+    }
+    if keys.just_pressed(KeyCode::KeyD) {
+        destroy.send_default();
+    }
+    if keys.just_pressed(KeyCode::KeyB) {
+        begin.send_default();
+    }
+    if keys.just_pressed(KeyCode::KeyC) {
+        create.send_default();
+    }
+}
+
+/// set up a simple 3D scene
+fn setup(
+    mut commands: Commands,
+    mut meshes: ResMut<Assets<Mesh>>,
+    mut materials: ResMut<Assets<StandardMaterial>>,
+) {
+    // circular base
+    commands.spawn(PbrBundle {
+        mesh: meshes.add(Circle::new(4.0)),
+        material: materials.add(Color::WHITE),
+        transform: Transform::from_rotation(Quat::from_rotation_x(-std::f32::consts::FRAC_PI_2)),
+        ..default()
+    });
+    // cube
+    commands.spawn(PbrBundle {
+        mesh: meshes.add(Cuboid::new(1.0, 1.0, 1.0)),
+        material: materials.add(Color::rgb_u8(124, 144, 255)),
+        transform: Transform::from_xyz(0.0, 0.5, 0.0),
+        ..default()
+    });
+    // light
+    commands.spawn(PointLightBundle {
+        point_light: PointLight {
+            shadows_enabled: true,
+            ..default()
+        },
+        transform: Transform::from_xyz(4.0, 8.0, 4.0),
+        ..default()
+    });
+    commands.spawn(Camera3dBundle {
+        transform: Transform::from_xyz(-2.5, 4.5, 9.0).looking_at(Vec3::ZERO, Vec3::Y),
+        ..default()
+    });
+}