81b53d15d4
Resolves #1253 #1562 This makes the Commands apis consistent with World apis. This moves to a "type state" pattern (like World) where the "current entity" is stored in an `EntityCommands` builder. In general this tends to cuts down on indentation and line count. It comes at the cost of needing to type `commands` more and adding more semicolons to terminate expressions. I also added `spawn_bundle` to Commands because this is a common enough operation that I think its worth providing a shorthand.
76 lines
2.5 KiB
Rust
76 lines
2.5 KiB
Rust
use bevy::{
|
|
diagnostic::{FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin},
|
|
prelude::*,
|
|
};
|
|
use rand::{rngs::StdRng, Rng, SeedableRng};
|
|
|
|
/// This example spawns a large number of cubes, each with its own changing position and material
|
|
/// This is intended to be a stress test of bevy's ability to render many objects with different
|
|
/// properties For the best results, run it in release mode:
|
|
/// ```
|
|
/// cargo run --example spawner --release
|
|
/// ```
|
|
/// NOTE: Bevy still has a number of optimizations to do in this area. Expect the
|
|
/// performance here to go way up in the future
|
|
fn main() {
|
|
App::build()
|
|
.add_plugins(DefaultPlugins)
|
|
.add_plugin(FrameTimeDiagnosticsPlugin::default())
|
|
.add_plugin(LogDiagnosticsPlugin::default())
|
|
.add_startup_system(setup.system())
|
|
.add_system(move_cubes.system())
|
|
.run();
|
|
}
|
|
|
|
fn move_cubes(
|
|
time: Res<Time>,
|
|
mut materials: ResMut<Assets<StandardMaterial>>,
|
|
mut query: Query<(&mut Transform, &Handle<StandardMaterial>)>,
|
|
) {
|
|
for (mut transform, material_handle) in query.iter_mut() {
|
|
let material = materials.get_mut(material_handle).unwrap();
|
|
transform.translation += Vec3::new(1.0, 0.0, 0.0) * time.delta_seconds();
|
|
material.base_color =
|
|
Color::BLUE * Vec3::splat((3.0 * time.seconds_since_startup() as f32).sin());
|
|
}
|
|
}
|
|
|
|
fn setup(
|
|
mut commands: Commands,
|
|
mut meshes: ResMut<Assets<Mesh>>,
|
|
mut materials: ResMut<Assets<StandardMaterial>>,
|
|
) {
|
|
// light
|
|
commands.spawn_bundle(LightBundle {
|
|
transform: Transform::from_xyz(4.0, -4.0, 5.0),
|
|
..Default::default()
|
|
});
|
|
// camera
|
|
commands.spawn_bundle(PerspectiveCameraBundle {
|
|
transform: Transform::from_xyz(0.0, 15.0, 150.0).looking_at(Vec3::ZERO, Vec3::Y),
|
|
..Default::default()
|
|
});
|
|
|
|
let mut rng = StdRng::from_entropy();
|
|
let cube_handle = meshes.add(Mesh::from(shape::Cube { size: 1.0 }));
|
|
for _ in 0..10000 {
|
|
commands.spawn_bundle(PbrBundle {
|
|
mesh: cube_handle.clone(),
|
|
material: materials.add(StandardMaterial {
|
|
base_color: Color::rgb(
|
|
rng.gen_range(0.0..1.0),
|
|
rng.gen_range(0.0..1.0),
|
|
rng.gen_range(0.0..1.0),
|
|
),
|
|
..Default::default()
|
|
}),
|
|
transform: Transform::from_xyz(
|
|
rng.gen_range(-50.0..50.0),
|
|
rng.gen_range(-50.0..50.0),
|
|
0.0,
|
|
),
|
|
..Default::default()
|
|
});
|
|
}
|
|
}
|