forestia/bevy
2
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
5ed8e0639a
bevy/release-content
History
re0312 5ed8e0639a
Merge ObserverState and Observer into single component (#18728) 
# Objective

- bevy removed `Observe` type parameters in #15151 ,it enables merging
`Observer` and `ObserverState ` into a single component. with this
consolidation ,we can improve efficiency while reducing boilerplate.

## Solution

- remove `ObserverState `and merge it  into `Observer`

## Testing

40%~60% performance win due to removal of redundant look up.

![image](https://github.com/user-attachments/assets/eb1d46cb-cca3-4c2b-948c-bf4ecb617de9)

This also improves ergonomics when using dynamic observer
```rust
// previously 
world.spawn(ObserverState {
            // SAFETY: we registered `event_a` above and it matches the type of EventA
            descriptor: unsafe { ObserverDescriptor::default().with_events(vec![event_a]) },
            runner: |mut world, _trigger, _ptr, _propagate| {
                world.resource_mut::<Order>().observed("event_a");
            },
            ..Default::default()
        });

// now
let observe = unsafe {
    Observer::with_dynamic_runner(|mut world, _trigger, _ptr, _propagate| {
        world.resource_mut::<Order>().observed("event_a");
    })
    .with_event(event_a)
};
world.spawn(observe);
```
2025-05-06 00:12:27 +00:00
..
migration-guides Merge ObserverState and Observer into single component (#18728) 2025-05-06 00:12:27 +00:00
release-notes Add a viewport UI widget (#17253) 2025-05-05 22:57:37 +00:00
migration_guides_template.md Make some changes to the migration guide recommendations (#18794) 2025-04-10 19:25:56 +00:00
migration_guides.md Make some changes to the migration guide recommendations (#18794) 2025-04-10 19:25:56 +00:00
README.md
release_notes_template.md
release_notes.md

README.md

Release Content

This directory contains drafts of documentation for the current development cycle, which will be published to the website during the next release. You can find more information in the release notes and migration guide files.