25bfa80e60
# Objective Yet another PR for migrating stuff to required components. This time, cameras! ## Solution As per the [selected proposal](https://hackmd.io/tsYID4CGRiWxzsgawzxG_g#Combined-Proposal-1-Selected), deprecate `Camera2dBundle` and `Camera3dBundle` in favor of `Camera2d` and `Camera3d`. Adding a `Camera` without `Camera2d` or `Camera3d` now logs a warning, as suggested by Cart [on Discord](https://discord.com/channels/691052431525675048/1264881140007702558/1291506402832945273). I would personally like cameras to work a bit differently and be split into a few more components, to avoid some footguns and confusing semantics, but that is more controversial, and shouldn't block this core migration. ## Testing I ran a few 2D and 3D examples, and tried cameras with and without render graphs. --- ## Migration Guide `Camera2dBundle` and `Camera3dBundle` have been deprecated in favor of `Camera2d` and `Camera3d`. Inserting them will now also insert the other components required by them automatically.
81 lines
2.6 KiB
Rust
81 lines
2.6 KiB
Rust
//! How to use an external thread to run an infinite task and communicate with a channel.
|
|
|
|
use bevy::prelude::*;
|
|
// Using crossbeam_channel instead of std as std `Receiver` is `!Sync`
|
|
use crossbeam_channel::{bounded, Receiver};
|
|
use rand::{Rng, SeedableRng};
|
|
use rand_chacha::ChaCha8Rng;
|
|
use std::time::{Duration, Instant};
|
|
|
|
fn main() {
|
|
App::new()
|
|
.add_event::<StreamEvent>()
|
|
.add_plugins(DefaultPlugins)
|
|
.add_systems(Startup, setup)
|
|
.add_systems(Update, (read_stream, spawn_text, move_text))
|
|
.run();
|
|
}
|
|
|
|
#[derive(Resource, Deref)]
|
|
struct StreamReceiver(Receiver<u32>);
|
|
|
|
#[derive(Event)]
|
|
struct StreamEvent(u32);
|
|
|
|
fn setup(mut commands: Commands) {
|
|
commands.spawn(Camera2d);
|
|
|
|
let (tx, rx) = bounded::<u32>(10);
|
|
std::thread::spawn(move || {
|
|
// We're seeding the PRNG here to make this example deterministic for testing purposes.
|
|
// This isn't strictly required in practical use unless you need your app to be deterministic.
|
|
let mut rng = ChaCha8Rng::seed_from_u64(19878367467713);
|
|
loop {
|
|
// Everything here happens in another thread
|
|
// This is where you could connect to an external data source
|
|
let start_time = Instant::now();
|
|
let duration = Duration::from_secs_f32(rng.gen_range(0.0..0.2));
|
|
while start_time.elapsed() < duration {
|
|
// Spinning for 'duration', simulating doing hard work!
|
|
}
|
|
|
|
tx.send(rng.gen_range(0..2000)).unwrap();
|
|
}
|
|
});
|
|
|
|
commands.insert_resource(StreamReceiver(rx));
|
|
}
|
|
|
|
// This system reads from the receiver and sends events to Bevy
|
|
fn read_stream(receiver: Res<StreamReceiver>, mut events: EventWriter<StreamEvent>) {
|
|
for from_stream in receiver.try_iter() {
|
|
events.send(StreamEvent(from_stream));
|
|
}
|
|
}
|
|
|
|
fn spawn_text(mut commands: Commands, mut reader: EventReader<StreamEvent>) {
|
|
let text_style = TextStyle::default();
|
|
|
|
for (per_frame, event) in reader.read().enumerate() {
|
|
commands.spawn(Text2dBundle {
|
|
text: Text::from_section(event.0.to_string(), text_style.clone())
|
|
.with_justify(JustifyText::Center),
|
|
transform: Transform::from_xyz(per_frame as f32 * 100.0, 300.0, 0.0),
|
|
..default()
|
|
});
|
|
}
|
|
}
|
|
|
|
fn move_text(
|
|
mut commands: Commands,
|
|
mut texts: Query<(Entity, &mut Transform), With<Text>>,
|
|
time: Res<Time>,
|
|
) {
|
|
for (entity, mut position) in &mut texts {
|
|
position.translation -= Vec3::new(0.0, 100.0 * time.delta_seconds(), 0.0);
|
|
if position.translation.y < -300.0 {
|
|
commands.entity(entity).despawn();
|
|
}
|
|
}
|
|
}
|