use bevy::{     prelude::*,     render::view::screenshot::{save_to_disk, Capturing, Screenshot},     window::{CursorIcon, SystemCursorIcon}, };  fn main() {     App::new()         .add_plugins(DefaultPlugins)         .add_systems(Startup, setup)         .add_systems(Update, (screenshot_on_spacebar, screenshot_saving))         .run(); }  fn screenshot_on_spacebar(     mut commands: Commands,     input: Res<ButtonInput<KeyCode>>,     mut counter: Local<u32>, ) {     if input.just_pressed(KeyCode::Space) {         let path = format!("./screenshot-{}.png", *counter);         *counter += 1;         commands             .spawn(Screenshot::primary_window())             .observe(save_to_disk(path));     } }  fn screenshot_saving(     mut commands: Commands,     screenshot_saving: Query<Entity, With<Capturing>>,     window: Single<Entity, With<Window>>, ) {     match screenshot_saving.iter().count() {         0 => {             commands.entity(*window).remove::<CursorIcon>();         }         x if x > 0 => {             commands                 .entity(*window)                 .insert(CursorIcon::from(SystemCursorIcon::Progress));         }         _ => {}     } }  /// set up a simple 3D scene fn setup(     mut commands: Commands,     mut meshes: ResMut<Assets<Mesh>>,     mut materials: ResMut<Assets<StandardMaterial>>, ) {     // plane     commands.spawn((         Mesh3d(meshes.add(Plane3d::default().mesh().size(5.0, 5.0))),         MeshMaterial3d(materials.add(Color::srgb(0.3, 0.5, 0.3))),     ));     // cube     commands.spawn((         Mesh3d(meshes.add(Cuboid::default())),         MeshMaterial3d(materials.add(Color::srgb(0.8, 0.7, 0.6))),         Transform::from_xyz(0.0, 0.5, 0.0),     ));     // light     commands.spawn((         PointLight {             shadows_enabled: true,             ..default()         },         Transform::from_xyz(4.0, 8.0, 4.0),     ));     // camera     commands.spawn((         Camera3d::default(),         Transform::from_xyz(-2.0, 2.5, 5.0).looking_at(Vec3::ZERO, Vec3::Y),     ));      commands.spawn((         Text::new("Press <spacebar> to save a screenshot to disk"),         Node {             position_type: PositionType::Absolute,             top: px(12),             left: px(12),             ..default()         },     )); }