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87 lines
3.5 KiB
JavaScript
87 lines
3.5 KiB
JavaScript
// Copyright (C) 2026 half144 and PS5 React contributors
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// SPDX-License-Identifier: GPL-3.0-or-later
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// Additional attribution term: see LICENSE-ATTRIBUTION.
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// Controller events from the per-frame GamepadState: native.js reads the state, this diffs it. Pure
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// apart from the frame subscription, so the diffing is testable without a host.
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import {onFrame} from './frame.js';
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/** In GamepadState bit order (native/shared/host_api.hpp kButtonNames). */
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export const BUTTONS = ['up', 'down', 'left', 'right', 'cross', 'circle', 'triangle', 'square', 'l1', 'r1',
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'l2', 'r2', 'l3', 'r3', 'options', 'touchpad'];
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/**
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* @typedef {import('./native.js').Button} Button
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* @typedef {import('./native.js').GamepadState} GamepadState
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* @typedef {{type: 'press', button: Button, state: GamepadState}
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* | {type: 'release', button: Button, heldMs: number, state: GamepadState}
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* | {type: 'trigger', trigger: 'l2' | 'r2', value: number, previous: number, state: GamepadState}
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* | {type: 'frame', elapsedMs: number, state: GamepadState}} ControllerEvent
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*/
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/**
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* The events between two frames' states: releases, then presses (each in button order), then trigger
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* travel changes. `held` maps each held button to the milliseconds it has been down, and is updated.
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* @param {GamepadState} previous @param {GamepadState} next
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* @param {Map<Button, number>} held @param {number} elapsedMs
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* @returns {ControllerEvent[]}
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*/
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export function gamepadEvents(previous, next, held, elapsedMs) {
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const events = [];
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const was = new Set(previous.buttons), now = new Set(next.buttons);
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for (const [button, ms] of held) held.set(button, ms + elapsedMs);
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for (const button of BUTTONS) {
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if (!was.has(button) || now.has(button)) continue;
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events.push({type: 'release', button, heldMs: held.get(button) ?? 0, state: next});
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held.delete(button);
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}
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for (const button of BUTTONS) {
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if (was.has(button) || !now.has(button)) continue;
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events.push({type: 'press', button, state: next});
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held.set(button, 0);
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}
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for (const trigger of ['l2', 'r2']) {
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if (next[trigger] !== previous[trigger])
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events.push({type: 'trigger', trigger, value: next[trigger], previous: previous[trigger], state: next});
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}
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return events;
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}
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/**
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* One frame subscription shared by every watcher, active only while there are watchers: each frame
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* reads the state once and gives every watcher it and the events since that watcher's last frame. A
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* button already held when a watcher starts is not a press for it (it may be the press that mounted
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* the watcher); its release is.
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* @param {() => GamepadState} read
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*/
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export function gamepadSource(read) {
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const watchers = new Set();
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let stop = null;
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const step = elapsedMs => {
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const next = read();
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// A watcher added by another's callback starts next frame.
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for (const watcher of [...watchers]) {
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if (!watchers.has(watcher)) continue;
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const events = gamepadEvents(watcher.state, next, watcher.held, elapsedMs);
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watcher.state = next;
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watcher.callback(next, events, elapsedMs);
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}
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};
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return {
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/**
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* @param {(state: GamepadState, events: ControllerEvent[], elapsedMs: number) => void} callback
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* @returns {() => void} stops watching
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*/
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watch(callback) {
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const state = read();
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const watcher = {callback, state, held: new Map(state.buttons.map(button => [button, 0]))};
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watchers.add(watcher);
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stop ??= onFrame(step);
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return () => {
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if (!watchers.delete(watcher) || watchers.size) return;
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stop();
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stop = null;
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};
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},
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};
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}
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