mirror of
https://github.com/bevyengine/bevy
synced 2024-11-22 12:43:34 +00:00
11b41206eb
This updates the `pipelined-rendering` branch to use the latest `bevy_ecs` from `main`. This accomplishes a couple of goals: 1. prepares for upcoming `custom-shaders` branch changes, which were what drove many of the recent bevy_ecs changes on `main` 2. prepares for the soon-to-happen merge of `pipelined-rendering` into `main`. By including bevy_ecs changes now, we make that merge simpler / easier to review. I split this up into 3 commits: 1. **add upstream bevy_ecs**: please don't bother reviewing this content. it has already received thorough review on `main` and is a literal copy/paste of the relevant folders (the old folders were deleted so the directories are literally exactly the same as `main`). 2. **support manual buffer application in stages**: this is used to enable the Extract step. we've already reviewed this once on the `pipelined-rendering` branch, but its worth looking at one more time in the new context of (1). 3. **support manual archetype updates in QueryState**: same situation as (2).
51 lines
1.5 KiB
Rust
51 lines
1.5 KiB
Rust
use bevy::prelude::*;
|
|
use rand::Rng;
|
|
|
|
// This example illustrates how to react to component change
|
|
fn main() {
|
|
App::new()
|
|
.add_plugins(DefaultPlugins)
|
|
.add_startup_system(setup)
|
|
.add_system(change_component)
|
|
.add_system(change_detection)
|
|
.add_system(tracker_monitoring)
|
|
.run();
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
struct MyComponent(f64);
|
|
|
|
fn setup(mut commands: Commands) {
|
|
commands.spawn().insert(MyComponent(0.));
|
|
commands.spawn().insert(Transform::identity());
|
|
}
|
|
|
|
fn change_component(time: Res<Time>, mut query: Query<(Entity, &mut MyComponent)>) {
|
|
for (entity, mut component) in query.iter_mut() {
|
|
if rand::thread_rng().gen_bool(0.1) {
|
|
info!("changing component {:?}", entity);
|
|
component.0 = time.seconds_since_startup();
|
|
}
|
|
}
|
|
}
|
|
|
|
// There are query filters for `Changed<T>` and `Added<T>`
|
|
// Only entities matching the filters will be in the query
|
|
fn change_detection(query: Query<(Entity, &MyComponent), Changed<MyComponent>>) {
|
|
for (entity, component) in query.iter() {
|
|
info!("{:?} changed: {:?}", entity, component,);
|
|
}
|
|
}
|
|
|
|
// By looking at trackers, the query is not filtered but the information is available
|
|
fn tracker_monitoring(
|
|
query: Query<(
|
|
Entity,
|
|
Option<&MyComponent>,
|
|
Option<ChangeTrackers<MyComponent>>,
|
|
)>,
|
|
) {
|
|
for (entity, component, trackers) in query.iter() {
|
|
info!("{:?}: {:?} -> {:?}", entity, component, trackers);
|
|
}
|
|
}
|