mirror of
https://github.com/bevyengine/bevy
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e788e3bc83
# Objective
- Significantly improve the ergonomics of gamepads and allow new
features
Gamepads are a bit unergonomic to work with, they use resources but
unlike other inputs, they are not limited to a single gamepad, to get
around this it uses an identifier (Gamepad) to interact with anything
causing all sorts of issues.
1. There are too many: Gamepads, GamepadSettings, GamepadInfo,
ButtonInput<T>, 2 Axis<T>.
2. ButtonInput/Axis generic methods become really inconvenient to use
e.g. any_pressed()
3. GamepadButton/Axis structs are unnecessary boilerplate:
```rust
for gamepad in gamepads.iter() {
if button_inputs.just_pressed(GamepadButton::new(gamepad, GamepadButtonType::South)) {
info!("{:?} just pressed South", gamepad);
} else if button_inputs.just_released(GamepadButton::new(gamepad, GamepadButtonType::South))
{
info!("{:?} just released South", gamepad);
}
}
```
4. Projects often need to create resources to store the selected gamepad
and have to manually check if their gamepad is still valid anyways.
- Previously attempted by #3419 and #12674
## Solution
- Implement gamepads as entities.
Using entities solves all the problems above and opens new
possibilities.
1. Reduce boilerplate and allows iteration
```rust
let is_pressed = gamepads_buttons.iter().any(|buttons| buttons.pressed(GamepadButtonType::South))
```
2. ButtonInput/Axis generic methods become ergonomic again
```rust
gamepad_buttons.any_just_pressed([GamepadButtonType::Start, GamepadButtonType::Select])
```
3. Reduces the number of public components significantly (Gamepad,
GamepadSettings, GamepadButtons, GamepadAxes)
4. Components are highly convenient. Gamepad optional features could now
be expressed naturally (`Option<Rumble> or Option<Gyro>`), allows devs
to attach their own components and filter them, so code like this
becomes possible:
```rust
fn move_player<const T: usize>(
player: Query<&Transform, With<Player<T>>>,
gamepads_buttons: Query<&GamepadButtons, With<Player<T>>>,
) {
if let Ok(gamepad_buttons) = gamepads_buttons.get_single() {
if gamepad_buttons.pressed(GamepadButtonType::South) {
// move player
}
}
}
```
---
## Follow-up
- [ ] Run conditions?
- [ ] Rumble component
# Changelog
## Added
TODO
## Changed
TODO
## Removed
TODO
## Migration Guide
TODO
---------
Co-authored-by: Carter Anderson <mcanders1@gmail.com>
60 lines
2.4 KiB
Rust
60 lines
2.4 KiB
Rust
//! Iterates and prints gamepad input and connection events.
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use bevy::{
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input::gamepad::{
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GamepadAxisChangedEvent, GamepadButtonChangedEvent, GamepadButtonStateChangedEvent,
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GamepadConnectionEvent, GamepadEvent,
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},
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prelude::*,
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};
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.add_systems(Update, (gamepad_events, gamepad_ordered_events))
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.run();
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}
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fn gamepad_events(
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mut connection_events: EventReader<GamepadConnectionEvent>,
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// Handles the continuous measure of an axis, equivalent to GamepadAxes::get.
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mut axis_changed_events: EventReader<GamepadAxisChangedEvent>,
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// Handles the continuous measure of how far a button has been pressed down, equivalent to `GamepadButtons::get`.
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mut button_changed_events: EventReader<GamepadButtonChangedEvent>,
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// Handles the boolean measure of whether a button is considered pressed or unpressed, as
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// defined by the thresholds in `GamepadSettings::button_settings`.
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// When the threshold is crossed and the button state changes, this event is emitted.
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mut button_input_events: EventReader<GamepadButtonStateChangedEvent>,
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) {
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for connection_event in connection_events.read() {
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info!("{:?}", connection_event);
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}
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for axis_changed_event in axis_changed_events.read() {
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info!(
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"{:?} of {:?} is changed to {}",
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axis_changed_event.axis, axis_changed_event.entity, axis_changed_event.value
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);
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}
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for button_changed_event in button_changed_events.read() {
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info!(
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"{:?} of {:?} is changed to {}",
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button_changed_event.button, button_changed_event.entity, button_changed_event.value
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);
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}
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for button_input_event in button_input_events.read() {
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info!("{:?}", button_input_event);
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}
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}
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// If you require in-frame relative event ordering, you can also read the `Gamepad` event
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// stream directly. For standard use-cases, reading the events individually or using the
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// `Input<T>` or `Axis<T>` resources is preferable.
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fn gamepad_ordered_events(mut gamepad_events: EventReader<GamepadEvent>) {
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for gamepad_event in gamepad_events.read() {
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match gamepad_event {
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GamepadEvent::Connection(connection_event) => info!("{:?}", connection_event),
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GamepadEvent::Button(button_event) => info!("{:?}", button_event),
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GamepadEvent::Axis(axis_event) => info!("{:?}", axis_event),
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}
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}
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}
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