148 lines
4.5 KiB
Rust
148 lines
4.5 KiB
Rust
//! Renders a lot of animated sprites to allow performance testing.
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//!
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//! It sets up many animated sprites in different sizes and rotations,
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//! and at different scales in the world, and moves the camera over them.
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//!
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//! Having sprites out of the camera's field of view should also help stress
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//! test any future potential 2d frustum culling implementation.
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use std::time::Duration;
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use bevy::{
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diagnostic::{FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin},
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math::Quat,
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prelude::*,
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render::camera::Camera,
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window::PresentMode,
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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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fn main() {
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App::new()
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// Since this is also used as a benchmark, we want it to display performance data.
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.add_plugin(LogDiagnosticsPlugin::default())
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.add_plugin(FrameTimeDiagnosticsPlugin::default())
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.add_plugins(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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.add_systems((
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setup.on_startup(),
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animate_sprite,
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print_sprite_count,
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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(
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mut commands: Commands,
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assets: Res<AssetServer>,
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mut texture_atlases: ResMut<Assets<TextureAtlas>>,
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) {
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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 texture_handle = assets.load("textures/rpg/chars/gabe/gabe-idle-run.png");
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let texture_atlas =
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TextureAtlas::from_grid(texture_handle, Vec2::new(24.0, 24.0), 7, 1, None, None);
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let texture_atlas_handle = texture_atlases.add(texture_atlas);
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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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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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let mut timer = Timer::from_seconds(0.1, TimerMode::Repeating);
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timer.set_elapsed(Duration::from_secs_f32(rng.gen::<f32>()));
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commands.spawn((
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SpriteSheetBundle {
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texture_atlas: texture_atlas_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: TextureAtlasSprite {
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custom_size: Some(tile_size),
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..default()
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},
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..default()
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},
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AnimationTimer(timer),
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));
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}
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}
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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(Quat::from_rotation_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(Component, Deref, DerefMut)]
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struct AnimationTimer(Timer);
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fn animate_sprite(
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time: Res<Time>,
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texture_atlases: Res<Assets<TextureAtlas>>,
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mut query: Query<(
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&mut AnimationTimer,
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&mut TextureAtlasSprite,
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&Handle<TextureAtlas>,
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)>,
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) {
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for (mut timer, mut sprite, texture_atlas_handle) in query.iter_mut() {
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timer.tick(time.delta());
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if timer.just_finished() {
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let texture_atlas = texture_atlases.get(texture_atlas_handle).unwrap();
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sprite.index = (sprite.index + 1) % texture_atlas.textures.len();
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}
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}
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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(
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time: Res<Time>,
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mut timer: Local<PrintingTimer>,
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sprites: Query<&TextureAtlasSprite>,
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) {
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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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