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https://github.com/bevyengine/bevy
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123 lines
3.9 KiB
Rust
123 lines
3.9 KiB
Rust
//! Renders a lot of sprites to allow performance testing.
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//! See <https://github.com/bevyengine/bevy/pull/1492>
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//!
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//! This example sets up many sprites in different sizes, rotations, and scales in the world.
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//! It also moves the camera over them to see how well frustum culling works.
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//!
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//! Add the `--colored` arg to run with color tinted sprites. This will cause the sprites to be rendered
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//! in multiple batches, reducing performance but useful for testing.
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use bevy::{
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diagnostic::{FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin},
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prelude::*,
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window::{PresentMode, WindowPlugin},
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};
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use rand::Rng;
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const CAMERA_SPEED: f32 = 1000.0;
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const COLORS: [Color; 3] = [Color::BLUE, Color::WHITE, Color::RED];
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#[derive(Resource)]
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struct ColorTint(bool);
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fn main() {
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App::new()
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.insert_resource(ColorTint(
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std::env::args().nth(1).unwrap_or_default() == "--colored",
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))
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// Since this is also used as a benchmark, we want it to display performance data.
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.add_plugins((
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LogDiagnosticsPlugin::default(),
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FrameTimeDiagnosticsPlugin,
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DefaultPlugins.set(WindowPlugin {
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primary_window: Some(Window {
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present_mode: PresentMode::AutoNoVsync,
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..default()
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}),
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..default()
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}),
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))
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.add_systems(Startup, setup)
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.add_systems(
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Update,
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(print_sprite_count, move_camera.after(print_sprite_count)),
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)
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.run();
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}
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fn setup(mut commands: Commands, assets: Res<AssetServer>, color_tint: Res<ColorTint>) {
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warn!(include_str!("warning_string.txt"));
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let mut rng = rand::thread_rng();
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let tile_size = Vec2::splat(64.0);
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let map_size = Vec2::splat(320.0);
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let half_x = (map_size.x / 2.0) as i32;
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let half_y = (map_size.y / 2.0) as i32;
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let sprite_handle = assets.load("branding/icon.png");
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// Spawns the camera
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commands.spawn(Camera2dBundle::default());
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// Builds and spawns the sprites
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let mut sprites = vec![];
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for y in -half_y..half_y {
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for x in -half_x..half_x {
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let position = Vec2::new(x as f32, y as f32);
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let translation = (position * tile_size).extend(rng.gen::<f32>());
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let rotation = Quat::from_rotation_z(rng.gen::<f32>());
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let scale = Vec3::splat(rng.gen::<f32>() * 2.0);
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sprites.push(SpriteBundle {
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texture: sprite_handle.clone(),
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transform: Transform {
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translation,
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rotation,
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scale,
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},
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sprite: Sprite {
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custom_size: Some(tile_size),
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color: if color_tint.0 {
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COLORS[rng.gen_range(0..3)]
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} else {
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Color::WHITE
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},
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..default()
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},
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..default()
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});
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}
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}
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commands.spawn_batch(sprites);
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}
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// System for rotating and translating the camera
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fn move_camera(time: Res<Time>, mut camera_query: Query<&mut Transform, With<Camera>>) {
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let mut camera_transform = camera_query.single_mut();
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camera_transform.rotate_z(time.delta_seconds() * 0.5);
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*camera_transform = *camera_transform
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* Transform::from_translation(Vec3::X * CAMERA_SPEED * time.delta_seconds());
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}
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#[derive(Deref, DerefMut)]
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struct PrintingTimer(Timer);
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impl Default for PrintingTimer {
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fn default() -> Self {
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Self(Timer::from_seconds(1.0, TimerMode::Repeating))
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}
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}
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// System for printing the number of sprites on every tick of the timer
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fn print_sprite_count(time: Res<Time>, mut timer: Local<PrintingTimer>, sprites: Query<&Sprite>) {
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timer.tick(time.delta());
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if timer.just_finished() {
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info!("Sprites: {}", sprites.iter().count());
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}
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}
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