playcanvas/build/playcanvas.prf/src/extras/input/sources/gamepad-source.js

PlayCanvas WebGL game engine

import { InputSource } from '../input.js';

const BUTTON_CODES = {
		A: 0,
		B: 1,
		X: 2,
		Y: 3,
		LB: 4,
		RB: 5,
		LT: 6,
		RT: 7,
		SELECT: 8,
		START: 9,
		LEFT_STICK: 10,
		RIGHT_STICK: 11
};
const BUTTON_COUNT = Object.keys(BUTTON_CODES).length;
class GamepadSource extends InputSource {
		static{
				this.buttonCode = BUTTON_CODES;
		}
		constructor(){
				super({
						buttons: Array(BUTTON_COUNT).fill(0),
						leftStick: [
								0,
								0
						],
						rightStick: [
								0,
								0
						]
				}), this._buttonPrev = Array(BUTTON_COUNT).fill(0);
		}
		read() {
				const gamepads = navigator.getGamepads();
				for(let i = 0; i < gamepads.length; i++){
						const gp = gamepads[i];
						if (!gp) {
								continue;
						}
						if (gp.mapping !== 'standard') {
								continue;
						}
						if (gp.axes.length < 4) {
								continue;
						}
						if (gp.buttons.length < BUTTON_COUNT) {
								continue;
						}
						const { buttons, axes } = gp;
						for(let j = 0; j < this._buttonPrev.length; j++){
								const state = +buttons[j].pressed;
								this.deltas.buttons[j] = state - this._buttonPrev[j];
								this._buttonPrev[j] = state;
						}
						this.deltas.leftStick.append([
								axes[0],
								axes[1]
						]);
						this.deltas.rightStick.append([
								axes[2],
								axes[3]
						]);
				}
				return super.read();
		}
}

export { GamepadSource };