apple2js/js/ui/gamepad.ts

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import Apple2IO from '../apple2io';
import { BUTTON, ButtonType, GamepadConfiguration } from './types';
export let gamepad: Gamepad | null = null;
const DEFAULT_GAMEPAD: GamepadConfiguration = {
'A': 0,
'B': 1,
'L1': 0,
'R1': 1,
'START': '\x1B'
} as const;
/**
* An array with 16 entries. For each entry _e_:
*
* * if _e_ <= 0, then _-e_ is 0 | 1 | 2 and represents a joystick button;
* * if _e_ > 0, then _e_ is a key on the keyboard that is pressed;
* * if _e_ is undefined, nothing happens.
*/
const gamepadMap: Array<number | undefined> = [];
/**
* An array with 16 entries saying whether or not the given button is
* currently pressed.
*/
const gamepadState: boolean[] = [];
let flipX = false;
let flipY = false;
window.addEventListener('gamepadconnected', function (e: GamepadEvent) {
gamepad = e.gamepad;
});
export function processGamepad(io: Apple2IO) {
// Always use the first gamepad
gamepad = navigator.getGamepads()[0];
if (!gamepad) {
return;
}
const x = (gamepad.axes[0] * 1.414 + 1) / 2.0;
const y = (gamepad.axes[1] * 1.414 + 1) / 2.0;
io.paddle(0, flipX ? 1.0 - x : x);
io.paddle(1, flipY ? 1.0 - y : y);
for (let idx = 0; idx < gamepad.buttons.length; idx++) {
const val = gamepadMap[idx];
if (val !== undefined) {
const old = gamepadState[idx];
const button = gamepad.buttons[idx];
let pressed: boolean;
if (typeof button === 'object') {
pressed = button.pressed;
} else {
pressed = (button === 1.0);
}
if (pressed && !old) {
if (val <= 0) {
io.buttonDown(-val as 0 | 1 | 2);
} else {
io.keyDown(val);
}
} else if (!pressed && old) {
if (val <= 0) {
io.buttonUp(-val as 0 | 1 | 2);
} else {
io.keyUp();
}
}
gamepadState[idx] = pressed;
}
}
}
export function configGamepad(configFlipX: boolean, configFlipY: boolean) {
flipX = configFlipX;
flipY = configFlipY;
}
export function initGamepad(data?: GamepadConfiguration) {
// Clear map
for (let idx = 0; idx < 16; idx++) {
gamepadMap[idx] = undefined;
}
const map = data || DEFAULT_GAMEPAD;
for (const entry of Object.entries(map)) {
const key = entry[0] as ButtonType;
const val = entry[1] as number | string;
let mapVal;
if (typeof val === 'string') {
mapVal = val.charCodeAt(0);
} else {
mapVal = -val;
}
if (key in BUTTON) {
gamepadMap[BUTTON[key]] = mapVal;
} else {
gamepadMap[parseInt(key, 10)] = mapVal;
}
}
}