BAYX to ABXY Userscript

abxy.user.js

// ==UserScript==
// @name         Gamepad buttons swapper
// @namespace    https://github.com/redphx
// @version      0.1
// @description  try to take over the world!
// @author       redphx
// @match        https://hardwaretester.com/gamepad
// @match        https://www.xbox.com/*/play*
// @grant        none
// @run-at       document-start
// ==/UserScript==

function cloneGamepad(gamepad) {
    const cloned = {
        id: gamepad.id,
        index: gamepad.index,
        connected: gamepad.connected,
        timestamp: 0,
        mapping: gamepad.mapping,
        haptichapticActuators: gamepad.hapticActuators,
        buttons: [],
    };

    return cloned;
}

function cloneButtons(buttons) {
    const tmp = [];
    buttons.forEach(button => {
        tmp.push({
            pressed: button.pressed,
            // touched: button.touched,
            value: button.value,
        });
    });
    return tmp;
}

function swapButton(buttons, indexA, indexB) {
    const tmp = buttons[indexA];
    buttons[indexA] = buttons[indexB];
    buttons[indexB] = tmp;

    return buttons;
}


let emulatedGamepads = [null, null, null, null];
window.addEventListener('gamepadconnected', e => {
    const gamepad = e.gamepad;
    if (gamepad.id.toLowerCase().includes('8bitdo')) {
        emulatedGamepads[gamepad.index] = cloneGamepad(gamepad);
    }
});

window.addEventListener('gamepaddisconnected', e => {
    const gamepad = e.gamepad;
    if (gamepad.id.toLowerCase().includes('8bitdo')) {
        emulatedGamepads[gamepad.index] = null;
    }
});


const originalGetGamepads = navigator.getGamepads;
navigator.getGamepads = function() {
    const originalGamepads = originalGetGamepads.apply(this);

    emulatedGamepads.forEach((emulated, index) => {
        if (!emulated) {
            return;
        }

        const orgGamepad = originalGamepads[index];
        let buttons = cloneButtons(orgGamepad.buttons);
        buttons = swapButton(buttons, 0, 1);
        buttons = swapButton(buttons, 2, 3);
        emulated.buttons = buttons;

        emulated.axes = orgGamepad.axes;
        emulated.timestamp = orgGamepad.timestamp;

        originalGamepads[emulated.index] = emulated;
    });

    return originalGamepads;
}