Buffalo Controller

controller.js

(function() {
  
  /**
  * Buffalo Classic USB Gamepad button ids:
  * 0: B (yellow)
  * 1: A (red)
  * 2: Y (green)
  * 3: X (blue)
  * 4,6: left trigger (top left)
  * 5,7: right trigger (top right)
  * 4,6: left trigger (top left)
  * 5,7: right trigger (top right)
  * 8: select
  * 9: start
  *
  *
  * 12: up (d-pad)
  * 13: down (d-pad)
  * 14: left (d-pad)
  * 15: right (d-pad)
  **/

  /**
  * Request animation frame polyfill
  **/

  var lastTime = 0;
  var vendors = ['ms', 'moz', 'webkit', 'o'];
  for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
    window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
    window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] || 
      window[vendors[x]+'CancelRequestAnimationFrame'];
  }
 
  if (!window.requestAnimationFrame)
    window.requestAnimationFrame = function(callback, element) {
      var currTime = new Date().getTime();
      var timeToCall = Math.max(0, 16 - (currTime - lastTime));
      var id = window.setTimeout(function() {
        callback(currTime + timeToCall);
      }, timeToCall);
      lastTime = currTime + timeToCall;
      return id;
  };
 
  if (!window.cancelAnimationFrame)
    window.cancelAnimationFrame = function(id) { clearTimeout(id); };

  /**
  * Gamepads
  **/

  function onConnect(e) {
    console.log('Gamepad connected at index %d: %s. %d buttons, %d axes.',
      e.gamepad.index, e.gamepad.id,
      e.gamepad.buttons.length, e.gamepad.axes.length);
    gamepadIndices.push(e.gamepad.index);
  }

  function onDisconnect(e) {
    console.log('Gamepad disconnected from index %d: %s',
      e.gamepad.index, e.gamepad.id);
  }

  function getGamepads() {
    return navigator.getGamepads();
  }

  function getPressedButtons(gamepad) {
    return gamepad.buttons.reduce(function(arr, obj, idx) {
      if (obj.pressed) arr.push(idx);
      return arr;
    }, [])
  }

  function render() {
    gamepads = getGamepads();
    gamepadIndices.forEach(function(i) {
      var pressed = getPressedButtons(gamepads[i]);
      if (pressed.length) console.log(pressed)
    })
    requestAnimationFrame(render);
  }

  var gamepadIndices = [];
  window.addEventListener('gamepadconnected', onConnect);
  window.addEventListener('gamepaddisconnected', onDisconnect);
  render()
  
})()