var OS = require('./OS'); 
var Browser = require('./Browser'); 
var CanvasPool = require('../display/canvas/CanvasPool'); 
var Features = { 
canvas: false ,
canvasBitBltShift: null ,
file: false ,
fileSystem: false ,
getUserMedia: true ,
littleEndian: false ,
localStorage: false ,
pointerLock: false ,
support32bit: false ,
vibration: false ,
webGL: false ,
worker: false }
; 
function checkIsLittleEndian(){ 
var a = new ArrayBuffer(4); 
var b = new Uint8Array(a); 
var c = new Uint32Array(a); 
b[0] = 161; 
b[1] = 178; 
b[2] = 195; 
b[3] = 212; 
if (c[0] === 3569595041) { 
return true ; 
} 
if (c[0] === 2712847316) { 
return false ; 
} 
 else { 
return null ; 
} 
} 
function init(){ 
Features.canvas = !!window.CanvasRenderingContext2D || OS.cocoonJS; 
try { 
Features.localStorage = !!localStorage.getItem; 
} 
catch (error) { 
Features.localStorage = false ; 
} 
Features.file = !!window.File && !!window.FileReader && !!window.FileList && !!window.Blob; 
Features.fileSystem = !!window.requestFileSystem; 
var isUint8 = false ; 
var testWebGL = function (){ 
if (window.WebGLRenderingContext) { 
try { 
var canvas = CanvasPool.createWebGL(this); 
if (OS.cocoonJS) { 
canvas.screencanvas = false ; 
} 
var ctx = canvas.getContext('webgl') || canvas.getContext('experimental-webgl'); 
var canvas2D = CanvasPool.create2D(this); 
var ctx2D = canvas2D.getContext('2d'); 
var image = ctx2D.createImageData(1, 1); 
isUint8 = image.data instanceof Uint8ClampedArray; 
CanvasPool.remove(canvas); 
CanvasPool.remove(canvas2D); 
return !!ctx; 
} 
catch (e) { 
return false ; 
} 
} 
return false ; 
} 
; 
Features.webGL = testWebGL(); 
Features.worker = !!window.Worker; 
Features.pointerLock = 'pointerLockElement' in document || 'mozPointerLockElement' in document || 'webkitPointerLockElement' in document; 
navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia || navigator.oGetUserMedia; 
_AN_Write_url('URL', window, false , _AN_Read_url('URL', window) || window.webkitURL || window.mozURL || window.msURL); 
Features.getUserMedia = Features.getUserMedia && !!navigator.getUserMedia && !!_AN_Read_url('URL', window); 
if (Browser.firefox && Browser.firefoxVersion < 21) { 
Features.getUserMedia = false ; 
} 
if (!OS.iOS && (Browser.ie || Browser.firefox || Browser.chrome)) { 
Features.canvasBitBltShift = true ; 
} 
if (Browser.safari || Browser.mobileSafari) { 
Features.canvasBitBltShift = false ; 
} 
navigator.vibrate = navigator.vibrate || navigator.webkitVibrate || navigator.mozVibrate || navigator.msVibrate; 
if (navigator.vibrate) { 
Features.vibration = true ; 
} 
if (typeof ArrayBuffer !== 'undefined' && typeof Uint8Array !== 'undefined' && typeof Uint32Array !== 'undefined') { 
Features.littleEndian = checkIsLittleEndian(); 
} 
Features.support32bit = (typeof ArrayBuffer !== 'undefined' && typeof Uint8ClampedArray !== 'undefined' && typeof Int32Array !== 'undefined' && Features.littleEndian !== null  && isUint8); 
return Features; 
} 
module.exports = init();