many_sprites/
many_sprites.rs

1//! Renders a lot of sprites to allow performance testing.
2//! See <https://github.com/bevyengine/bevy/pull/1492>
3//!
4//! This example sets up many sprites in different sizes, rotations, and scales in the world.
5//! It also moves the camera over them to see how well frustum culling works.
6//!
7//! Add the `--colored` arg to run with color tinted sprites. This will cause the sprites to be rendered
8//! in multiple batches, reducing performance but useful for testing.
9
10use bevy::{
11    color::palettes::css::*,
12    diagnostic::{FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin},
13    prelude::*,
14    window::{PresentMode, WindowResolution},
15    winit::WinitSettings,
16};
17
18use rand::Rng;
19
20const CAMERA_SPEED: f32 = 1000.0;
21
22const COLORS: [Color; 3] = [Color::Srgba(BLUE), Color::Srgba(WHITE), Color::Srgba(RED)];
23
24#[derive(Resource)]
25struct ColorTint(bool);
26
27fn main() {
28    App::new()
29        .insert_resource(ColorTint(
30            std::env::args().nth(1).unwrap_or_default() == "--colored",
31        ))
32        // Since this is also used as a benchmark, we want it to display performance data.
33        .add_plugins((
34            LogDiagnosticsPlugin::default(),
35            FrameTimeDiagnosticsPlugin::default(),
36            DefaultPlugins.set(WindowPlugin {
37                primary_window: Some(Window {
38                    present_mode: PresentMode::AutoNoVsync,
39                    resolution: WindowResolution::new(1920, 1080).with_scale_factor_override(1.0),
40                    ..default()
41                }),
42                ..default()
43            }),
44        ))
45        .insert_resource(WinitSettings::continuous())
46        .add_systems(Startup, setup)
47        .add_systems(
48            Update,
49            (print_sprite_count, move_camera.after(print_sprite_count)),
50        )
51        .run();
52}
53
54fn setup(mut commands: Commands, assets: Res<AssetServer>, color_tint: Res<ColorTint>) {
55    warn!(include_str!("warning_string.txt"));
56
57    let mut rng = rand::rng();
58
59    let tile_size = Vec2::splat(64.0);
60    let map_size = Vec2::splat(320.0);
61
62    let half_x = (map_size.x / 2.0) as i32;
63    let half_y = (map_size.y / 2.0) as i32;
64
65    let sprite_handle = assets.load("branding/icon.png");
66
67    // Spawns the camera
68
69    commands.spawn(Camera2d);
70
71    // Builds and spawns the sprites
72    let mut sprites = vec![];
73    for y in -half_y..half_y {
74        for x in -half_x..half_x {
75            let position = Vec2::new(x as f32, y as f32);
76            let translation = (position * tile_size).extend(rng.random::<f32>());
77            let rotation = Quat::from_rotation_z(rng.random::<f32>());
78            let scale = Vec3::splat(rng.random::<f32>() * 2.0);
79
80            sprites.push((
81                Sprite {
82                    image: sprite_handle.clone(),
83                    custom_size: Some(tile_size),
84                    color: if color_tint.0 {
85                        COLORS[rng.random_range(0..3)]
86                    } else {
87                        Color::WHITE
88                    },
89                    ..default()
90                },
91                Transform {
92                    translation,
93                    rotation,
94                    scale,
95                },
96            ));
97        }
98    }
99    commands.spawn_batch(sprites);
100}
101
102// System for rotating and translating the camera
103fn move_camera(time: Res<Time>, mut camera_transform: Single<&mut Transform, With<Camera>>) {
104    camera_transform.rotate_z(time.delta_secs() * 0.5);
105    **camera_transform = **camera_transform
106        * Transform::from_translation(Vec3::X * CAMERA_SPEED * time.delta_secs());
107}
108
109#[derive(Deref, DerefMut)]
110struct PrintingTimer(Timer);
111
112impl Default for PrintingTimer {
113    fn default() -> Self {
114        Self(Timer::from_seconds(1.0, TimerMode::Repeating))
115    }
116}
117
118// System for printing the number of sprites on every tick of the timer
119fn print_sprite_count(time: Res<Time>, mut timer: Local<PrintingTimer>, sprites: Query<&Sprite>) {
120    timer.tick(time.delta());
121
122    if timer.just_finished() {
123        info!("Sprites: {}", sprites.iter().count());
124    }
125}
many_sprites/many_sprites.rs

many_sprites/
many_sprites.rs
