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bevymark.rs
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bevymark.rs
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//! This example provides a 2D benchmark.
//!
//! Usage: spawn more entities by clicking on the screen.
use bevy::{
diagnostic::{Diagnostics, FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin},
prelude::*,
time::FixedTimestep,
window::PresentMode,
};
use rand::{thread_rng, Rng};
const BIRDS_PER_SECOND: u32 = 10000;
const GRAVITY: f32 = -9.8 * 100.0;
const MAX_VELOCITY: f32 = 750.;
const BIRD_SCALE: f32 = 0.15;
const HALF_BIRD_SIZE: f32 = 256. * BIRD_SCALE * 0.5;
struct BevyCounter {
pub count: usize,
pub color: Color,
}
#[derive(Component)]
struct Bird {
velocity: Vec3,
}
fn main() {
App::new()
.insert_resource(WindowDescriptor {
title: "BevyMark".to_string(),
width: 800.,
height: 600.,
present_mode: PresentMode::AutoNoVsync,
resizable: true,
..default()
})
.add_plugins(DefaultPlugins)
.add_plugin(FrameTimeDiagnosticsPlugin::default())
.add_plugin(LogDiagnosticsPlugin::default())
.insert_resource(BevyCounter {
count: 0,
color: Color::WHITE,
})
.add_startup_system(setup)
.add_system(mouse_handler)
.add_system(movement_system)
.add_system(collision_system)
.add_system(counter_system)
.add_system_set(
SystemSet::new()
.with_run_criteria(FixedTimestep::step(0.2))
.with_system(scheduled_spawner),
)
.run();
}
struct BirdScheduled {
wave: usize,
per_wave: usize,
}
fn scheduled_spawner(
mut commands: Commands,
windows: Res<Windows>,
mut scheduled: ResMut<BirdScheduled>,
mut counter: ResMut<BevyCounter>,
bird_texture: Res<BirdTexture>,
) {
if scheduled.wave > 0 {
spawn_birds(
&mut commands,
&windows,
&mut counter,
scheduled.per_wave,
bird_texture.clone_weak(),
);
let mut rng = thread_rng();
counter.color = Color::rgb_linear(rng.gen(), rng.gen(), rng.gen());
scheduled.wave -= 1;
}
}
#[derive(Deref)]
struct BirdTexture(Handle<Image>);
#[derive(Component)]
struct StatsText;
fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
warn!(include_str!("warning_string.txt"));
let texture = asset_server.load("branding/icon.png");
commands.spawn_bundle(Camera2dBundle::default());
commands
.spawn_bundle(
TextBundle::from_sections([
TextSection::new(
"Bird Count: ",
TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 40.0,
color: Color::rgb(0.0, 1.0, 0.0),
},
),
TextSection::from_style(TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 40.0,
color: Color::rgb(0.0, 1.0, 1.0),
}),
TextSection::new(
"\nAverage FPS: ",
TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 40.0,
color: Color::rgb(0.0, 1.0, 0.0),
},
),
TextSection::from_style(TextStyle {
font: asset_server.load("fonts/FiraSans-Bold.ttf"),
font_size: 40.0,
color: Color::rgb(0.0, 1.0, 1.0),
}),
])
.with_style(Style {
position_type: PositionType::Absolute,
position: UiRect {
top: Val::Px(5.0),
left: Val::Px(5.0),
..default()
},
..default()
}),
)
.insert(StatsText);
commands.insert_resource(BirdTexture(texture));
commands.insert_resource(BirdScheduled {
per_wave: std::env::args()
.nth(1)
.and_then(|arg| arg.parse::<usize>().ok())
.unwrap_or_default(),
wave: std::env::args()
.nth(2)
.and_then(|arg| arg.parse::<usize>().ok())
.unwrap_or(1),
});
}
fn mouse_handler(
mut commands: Commands,
time: Res<Time>,
mouse_button_input: Res<Input<MouseButton>>,
windows: Res<Windows>,
bird_texture: Res<BirdTexture>,
mut counter: ResMut<BevyCounter>,
) {
if mouse_button_input.just_released(MouseButton::Left) {
let mut rng = thread_rng();
counter.color = Color::rgb_linear(rng.gen(), rng.gen(), rng.gen());
}
if mouse_button_input.pressed(MouseButton::Left) {
let spawn_count = (BIRDS_PER_SECOND as f64 * time.delta_seconds_f64()) as usize;
spawn_birds(
&mut commands,
&windows,
&mut counter,
spawn_count,
bird_texture.clone_weak(),
);
}
}
fn spawn_birds(
commands: &mut Commands,
windows: &Windows,
counter: &mut BevyCounter,
spawn_count: usize,
texture: Handle<Image>,
) {
let window = windows.primary();
let bird_x = (window.width() as f32 / -2.) + HALF_BIRD_SIZE;
let bird_y = (window.height() as f32 / 2.) - HALF_BIRD_SIZE;
let mut rng = thread_rng();
for count in 0..spawn_count {
let bird_z = (counter.count + count) as f32 * 0.00001;
commands
.spawn_bundle(SpriteBundle {
texture: texture.clone(),
transform: Transform {
translation: Vec3::new(bird_x, bird_y, bird_z),
scale: Vec3::splat(BIRD_SCALE),
..default()
},
sprite: Sprite {
color: counter.color,
..default()
},
..default()
})
.insert(Bird {
velocity: Vec3::new(
rng.gen::<f32>() * MAX_VELOCITY - (MAX_VELOCITY * 0.5),
0.,
0.,
),
});
}
counter.count += spawn_count;
}
fn movement_system(time: Res<Time>, mut bird_query: Query<(&mut Bird, &mut Transform)>) {
for (mut bird, mut transform) in &mut bird_query {
transform.translation.x += bird.velocity.x * time.delta_seconds();
transform.translation.y += bird.velocity.y * time.delta_seconds();
bird.velocity.y += GRAVITY * time.delta_seconds();
}
}
fn collision_system(windows: Res<Windows>, mut bird_query: Query<(&mut Bird, &Transform)>) {
let window = windows.primary();
let half_width = window.width() as f32 * 0.5;
let half_height = window.height() as f32 * 0.5;
for (mut bird, transform) in &mut bird_query {
let x_vel = bird.velocity.x;
let y_vel = bird.velocity.y;
let x_pos = transform.translation.x;
let y_pos = transform.translation.y;
if (x_vel > 0. && x_pos + HALF_BIRD_SIZE > half_width)
|| (x_vel <= 0. && x_pos - HALF_BIRD_SIZE < -(half_width))
{
bird.velocity.x = -x_vel;
}
if y_vel < 0. && y_pos - HALF_BIRD_SIZE < -half_height {
bird.velocity.y = -y_vel;
}
if y_pos + HALF_BIRD_SIZE > half_height && y_vel > 0.0 {
bird.velocity.y = 0.0;
}
}
}
fn counter_system(
diagnostics: Res<Diagnostics>,
counter: Res<BevyCounter>,
mut query: Query<&mut Text, With<StatsText>>,
) {
let mut text = query.single_mut();
if counter.is_changed() {
text.sections[1].value = counter.count.to_string();
}
if let Some(fps) = diagnostics.get(FrameTimeDiagnosticsPlugin::FPS) {
if let Some(average) = fps.average() {
text.sections[3].value = format!("{average:.2}");
}
};
}