bundle.js

(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);throw new Error("Cannot find module '"+o+"'")}var f=n[o]={exports:{}};t[o][0].call(f.exports,function(e){var n=t[o][1][e];return s(n?n:e)},f,f.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
/*
*
* Camera
*
* options: {
*   map: map,
*   follow: player,
*   followPoint: { x: game.width / 2, y: game.height / 2 },
*   cameraStartPosition: { x: 0, y: 0 },
*   viewport: { width: 25, height: 25 }
* }
*
*/

module.exports = Camera;

function Camera(options){
  var self = this;

  this.map = options.map;
  this.game = options.game;
  this.following = options.follow;
  this.following.camera = this;

  this.followPoint = {
    x: options.followPoint.x || null,
    y: options.followPoint.y || null
  };

  this.position = options.cameraStartPosition || { x: 0, y: 0 };
  
  this.deadZone = options.deadZone || { x: options.viewport.width / 2, y: options.viewport.height / 2 };
  
  this.viewport = options.viewport;
    
  this.viewportRect = new Rectangle(this.position.x, this.position.y, this.viewport.width, this.viewport.height);
            
  this.worldRect = new Rectangle(this.position.x, this.position.y, this.map.width, this.map.height);

  this.game.on('update', function(){
    self.update();
  });
}

Camera.prototype.update = function(){
  var following = this.following;
  var followPoint = this.followPoint;

  if (following !== null){
    if (followPoint.x !== null){
      
      if(following.position.x - this.position.x + this.deadZone.x > this.viewport.width){
        this.position.x = following.position.x - (this.viewport.width - this.deadZone.x);
      }

      else if(following.position.x - this.deadZone.x < this.position.x){
        this.position.x = following.position.x - this.deadZone.x;
      }
    }

    if (followPoint.y !== null){
      if(following.position.y - this.position.y + this.deadZone.y > this.viewport.height){
        this.position.y = following.position.y - (this.viewport.height - this.deadZone.y);
      }

      else if(following.position.y - this.deadZone.y < this.position.y) {
        this.position.y = following.position.y - this.deadZone.y;
      }
    }
  }

  this.viewportRect.set(this.position.x, this.position.y, this.viewport.width, this.viewport.height);

  if(!this.viewportRect.within(this.worldRect)){

    if(this.viewportRect.left < this.worldRect.left){
      this.position.x = this.worldRect.left;
    }

    if(this.viewportRect.top < this.worldRect.top){
      this.position.y = this.worldRect.top;
    }

    if(this.viewportRect.right > this.worldRect.right){
      this.position.x = this.worldRect.right - this.viewport.width;
    }

    if(this.viewportRect.bottom > this.worldRect.bottom){
      this.position.y = this.worldRect.bottom - this.viewport.height;
    }

  }

};

function Rectangle(left, top, width, height){
  this.left = left || 0;
  this.top = top || 0;
  this.right = left + width || 0;
  this.bottom = top + height || 0;
}

Rectangle.prototype.set = function(left, top, width, height){
  this.left = left;
  this.top = top;
  this.width = width || this.width;
  this.height = height || this.height;
  this.right = this.left + this.width;
  this.bottom = this.top + this.height;
};

Rectangle.prototype.within = function(rectangle) {
  return (
    rectangle.left <= this.left &&
    rectangle.right >= this.right &&
    rectangle.top <= this.top &&
    rectangle.bottom >= this.bottom
  );
};

Rectangle.prototype.overlaps = function(rectangle) {
  return (
    this.left < rectangle.right &&
    this.right > rectangle.left &&
    this.top < rectangle.bottom &&
    this.bottom > rectangle.top
  );
};
},{}],2:[function(require,module,exports){
var Preloader = require('imagepreloader');
var buzz = require('buzz');
var tic = require('tic')();

var Game = require('crtrdg-gameloop');
var Mouse = require('crtrdg-mouse');
var Keyboard = require('crtrdg-keyboard');
var Scenes = require('crtrdg-scene');

var Player = require('./player');
var NPC = require('./npc');

var Sprite = require('./util/sprite');
var MathUtil = require('./util/math');

var Camera = require('./camera');
var Map = require('./map');

var game = new Game();
var mouse = new Mouse(game);
var keyboard = new Keyboard(game);
var keysDown = keyboard.keysDown;

var uiElements = [].slice.call(document.querySelectorAll('.ui'));
var loading = document.getElementById('loading');
var menuEl = document.getElementById('menu');
var playButton = document.getElementById('play');
var secondsEl = document.getElementById('seconds');
var overEl = document.getElementById('over');
var overText = document.getElementById('over-text');
var playAgainButton = document.getElementById('play-again');

// Player Properties
var score = 0;
var scoreElement = document.getElementById('points');
var LEADING_ZEROS = '0000000000';

// NPC Properties
var npcArray = [];
var NUM_OF_NPCS = 100;
var turnedBabies = 0;

// points per NPC 
var NPC_POINTS_VALUE = 100;
var babySprites = ['tan-baby.png', 'brown-baby.png', 'white-baby.png'];

game.on('start', function(){
  console.log('started');
  /* reset score onload */
  score = 0;
  scoreElement.innerText = LEADING_ZEROS;
  //console.log(menu);
  menuEl.style.display = 'none';
  uiElements.forEach(function(el, i, arr){
    el.style.display = 'initial';
  });
  song.play();
});

game.on('draw', function(context){
	map.draw(context, camera);
});

game.on('pause', function(){
  console.log('paused');
});

game.on('resume', function(){
  console.log('resumed');
});


/*
* Sounds
*/

game.musicPaused = false;
var song = new buzz.sound('./sounds/song.mp3');
var zombieNoise = new buzz.sound('./sounds/zombie-noise.mp3');

var pauseMusic = document.getElementById('pause-music');
var playMusic = document.getElementById('play-music');

pauseMusic.addEventListener('click', function(e){
  song.pause();
  playMusic.style.display = 'initial';
  pauseMusic.style.display = 'none';
  game.musicPaused = true;
});

playMusic.addEventListener('click', function(e){
  song.play().loop();
  playMusic.style.display = 'none';
  pauseMusic.style.display = 'initial';
  game.musicPaused = false;
});


/*
* THE PLAYER
*/

var player = new Player({
  game: game,
  keysDown: keysDown,
  camera: camera,
  position: { x: 100, y: 100 }
}).addTo(game);

player.on('update', function(){
  for(var i=0; i<npcArray.length; i++){
    // if player touches npc and npc has not already turned into zombie
    if (player.attacking && player.touches(npcArray[i]) && (npcArray[i].zombie !== true)){
      // add to player score
      score +=  NPC_POINTS_VALUE;
      scoreElement.innerText = new String(LEADING_ZEROS + score).slice(-10);
      //console.log('current score: ' + score);
      npcArray[i].zombie = true;
      turnedBabies += 1;
      player.attack();
    }
  }
});

player.attack =  function(){
  zombieNoise.load();
  zombieNoise.play();
};


/*
*
* MAP & CAMERA
*
*/

var map = new Map(game, 2500, 2500);
map.generate();

var camera = new Camera({
  game: game,
  follow: player,
  followPoint: { x: game.width / 2, y: game.height / 2 },
  viewport: { width: game.width, height: game.height },
  map: map
});


/*
* THE NPCs i.e. non-player characters
*/
// Why pass in game to npc objects?
for(var i = 0; i < NUM_OF_NPCS; i++){
  npcArray[i] = new NPC({
    game: game,
    map: map,
    camera: camera,
    position: { x: MathUtil.randomInt(0, (map.width - 64)), y: MathUtil.randomInt(0, (map.height - 64)) },
    path: MathUtil.randomInt(0, 3)
  }).addTo(game);
}

var preload = new Preloader();
preload
  .add('images/zombie-baby.png')
  .add('images/tan-baby.png')
  .add('images/brown-baby.png')
  .add('images/white-baby.png')
  .add('images/turned-baby.png')
  .add('images/attacking.png')
  .success(function(images){
    
    player.image = new Sprite({
      entity: player,
      image: images['zombie-baby.png'],
      frames: 4,
      fps: 16
    });

    player.attackingImage = new Sprite({
      entity: player,
      image: images['attacking.png'],
      frames: 4,
      fps: 16
    });

    for(var i = 0; i < npcArray.length; i++){
      npcArray[i].image = new Sprite({
        entity: npcArray[i],
        image: images[babySprites[MathUtil.randomInt(0,2)]],
        turnedImage: images['turned-baby.png'],
        frames: 4,
        fps: 12
      });

      npcArray[i].turnedImage = new Sprite({
        entity: npcArray[i],
        image: images['turned-baby.png'],
        frames: 4,
        fps: 12
      });
    }

    scenes.set(menu);
  })
  .error(function(err){ console.log(err); })
  .done();


/*
* SCENES 
*/

var scenes = new Scenes(game);

var menu = scenes.create({
  name: 'menu'
});

menu.on('start', function(){
  loading.style.display = 'none';
  playButton.style.display = 'initial';
});

playButton.addEventListener('click', function(e){
  scenes.set(play);
}, false);

var play = scenes.create({
  name: 'play'
});

play.on('start', function(){
  game.start();
});

play.on('update', function(dt){
  tic.tick(dt);
  if (turnedBabies === NUM_OF_NPCS) scenes.set(over);
});

var seconds = 60;

tic.interval(function(param1) {
  seconds -= 1;
  secondsEl.innerText = seconds;
  if (seconds === 0) scenes.set(over);
}, 1000, 'Every');

var over = scenes.create({
  name: 'play'
});

over.on('start', function(){
  game.pause();
  if (turnedBabies < NUM_OF_NPCS) overText.innerText = 'NOPE.'
  else overText.innerText = 'YEP.'
  overEl.style.display = 'block';
});

playAgainButton.addEventListener('click', function(e){
  document.location.reload();
}, false);

},{"./camera":1,"./map":3,"./npc":23,"./player":24,"./util/math":25,"./util/sprite":26,"buzz":7,"crtrdg-gameloop":10,"crtrdg-keyboard":13,"crtrdg-mouse":16,"crtrdg-scene":18,"imagepreloader":20,"tic":22}],3:[function(require,module,exports){
var randomRGBA = require('./util/math').randomRGBA;

module.exports = Map;

function Map(game, width, height){
  this.game = game;
  this.width = width;
  this.height = height;
  this.image = null;
}

Map.prototype.generate = function(ticks){
  var context = document.createElement('canvas').getContext('2d');

  context.canvas.width = this.width;
  context.canvas.height = this.height;

  var size = 4;
  var columns = this.width / size;
  var rows = this.height / size;

  for (var x = 0, i = 0; i < columns; x+=size, i++){
    for (var y = 0, j=0; j < rows; y+=size, j++){
      context.fillStyle = randomRGBA(250, 255, 250, 255, 200, 225, 1);
      context.fillRect(x, y, size, size);
    }
  }

  this.image = new Image();
  this.image.src = context.canvas.toDataURL("image/png");

  context = null;
};

// draw the map adjusted to camera
Map.prototype.draw = function(context, camera) {
  context.drawImage(this.image, 0, 0, this.image.width, this.image.height, -camera.position.x, -camera.position.y, this.image.width, this.image.height);
};

},{"./util/math":25}],4:[function(require,module,exports){
module.exports = AABB

var vec2 = require('gl-matrix').vec2

function AABB(pos, vec) {
  if(!(this instanceof AABB)) {
    return new AABB(pos, vec)
  }

  this.base = pos
  this.vec = vec

  this.mag = vec2.length(this.vec)

  this.max = vec2.create()
  vec2.add(this.max, this.base, this.vec)
}

var cons = AABB
  , proto = cons.prototype

proto.perimeter = function() {
  return 2 * (this.vec[0] + this.vec[1])
}

proto.area = function() {
  return this.vec[0] * this.vec[0] + this.vec[1] * this.vec[1]
}

proto.intperimeter = function() {
  return (this.vec[0] + this.vec[1]) << 1
}

proto.width = function() {
  return this.vec[0]
}

proto.height = function() {
  return this.vec[1]
}

proto.x0 = function() {
  return this.base[0]
}

proto.y0 = function() {
  return this.base[1]
}

proto.x1 = function() {
  return this.max[0]
}

proto.y1 = function() {
  return this.max[1]
}

proto.translate = function(by) {
  vec2.add(this.max, this.max, by)
  vec2.add(this.base, this.base, by)
  return this
}

proto.expand = function(aabb) {
  var max = vec2.create()
    , min = vec2.create()

  vec2.max(max, aabb.max, this.max)
  vec2.min(min, aabb.base, this.base)
  vec2.sub(max, max, min)

  return new AABB(min, max)
}

proto.intersects = function(aabb) {
  if(aabb.base[0] > this.max[0]) return false
  if(aabb.base[1] > this.max[1]) return false
  if(aabb.max[0] < this.base[0]) return false
  if(aabb.max[1] < this.base[1]) return false

  return true
}

proto.union = function(aabb) {
  if(!this.intersects(aabb)) return null

  var base_x = Math.max(aabb.base[0], this.base[0])
    , base_y = Math.max(aabb.base[1], this.base[1])
    , max_x = Math.min(aabb.max[0], this.max[0])
    , max_y = Math.min(aabb.max[1], this.max[1])

  return new AABB([base_x, base_y], [max_x - base_x, max_y - base_y])
}

},{"gl-matrix":5}],5:[function(require,module,exports){
/**
 * @fileoverview gl-matrix - High performance matrix and vector operations
 * @author Brandon Jones
 * @author Colin MacKenzie IV
 * @version 2.0.0
 */

/* Copyright (c) 2012, Brandon Jones, Colin MacKenzie IV. All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this
    list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation 
    and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */


(function() {
  "use strict";

  var shim = {};
  if (typeof(exports) === 'undefined') {
    if(typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
      shim.exports = {};
      define(function() {
        return shim.exports;
      });
    } else {
      // gl-matrix lives in a browser, define its namespaces in global
      shim.exports = window;
    }    
  }
  else {
    // gl-matrix lives in commonjs, define its namespaces in exports
    shim.exports = exports;
  }

  (function(exports) {
    /* Copyright (c) 2012, Brandon Jones, Colin MacKenzie IV. All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this
    list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation 
    and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

/**
 * @class 2 Dimensional Vector
 * @name vec2
 */

var vec2 = {};

if(!GLMAT_EPSILON) {
    var GLMAT_EPSILON = 0.000001;
}
 
/**
 * Creates a new, empty vec2
 *
 * @returns {vec2} a new 2D vector
 */
vec2.create = function() {
    return new Float32Array(2);
};

/**
 * Creates a new vec2 initialized with values from an existing vector
 *
 * @param {vec2} a vector to clone
 * @returns {vec2} a new 2D vector
 */
vec2.clone = function(a) {
    var out = new Float32Array(2);
    out[0] = a[0];
    out[1] = a[1];
    return out;
};

/**
 * Creates a new vec2 initialized with the given values
 *
 * @param {Number} x X component
 * @param {Number} y Y component
 * @returns {vec2} a new 2D vector
 */
vec2.fromValues = function(x, y) {
    var out = new Float32Array(2);
    out[0] = x;
    out[1] = y;
    return out;
};

/**
 * Copy the values from one vec2 to another
 *
 * @param {vec2} out the receiving vector
 * @param {vec2} a the source vector
 * @returns {vec2} out
 */
vec2.copy = function(out, a) {
    out[0] = a[0];
    out[1] = a[1];
    return out;
};

/**
 * Set the components of a vec2 to the given values
 *
 * @param {vec2} out the receiving vector
 * @param {Number} x X component
 * @param {Number} y Y component
 * @returns {vec2} out
 */
vec2.set = function(out, x, y) {
    out[0] = x;
    out[1] = y;
    return out;
};

/**
 * Adds two vec2's
 *
 * @param {vec2} out the receiving vector
 * @param {vec2} a the first operand
 * @param {vec2} b the second operand
 * @returns {vec2} out
 */
vec2.add = function(out, a, b) {
    out[0] = a[0] + b[0];
    out[1] = a[1] + b[1];
    return out;
};

/**
 * Subtracts two vec2's
 *
 * @param {vec2} out the receiving vector
 * @param {vec2} a the first operand
 * @param {vec2} b the second operand
 * @returns {vec2} out
 */
vec2.sub = vec2.subtract = function(out, a, b) {
    out[0] = a[0] - b[0];
    out[1] = a[1] - b[1];
    return out;
};

/**
 * Multiplies two vec2's
 *
 * @param {vec2} out the receiving vector
 * @param {vec2} a the first operand
 * @param {vec2} b the second operand
 * @returns {vec2} out
 */
vec2.mul = vec2.multiply = function(out, a, b) {
    out[0] = a[0] * b[0];
    out[1] = a[1] * b[1];
    return out;
};

/**
 * Divides two vec2's
 *
 * @param {vec2} out the receiving vector
 * @param {vec2} a the first operand
 * @param {vec2} b the second operand
 * @returns {vec2} out
 */
vec2.div = vec2.divide = function(out, a, b) {
    out[0] = a[0] / b[0];
    out[1] = a[1] / b[1];
    return out;
};

/**
 * Returns the minimum of two vec2's
 *
 * @param {vec2} out the receiving vector
 * @param {vec2} a the first operand
 * @param {vec2} b the second operand
 * @returns {vec2} out
 */
vec2.min = function(out, a, b) {
    out[0] = Math.min(a[0], b[0]);
    out[1] = Math.min(a[1], b[1]);
    return out;
};

/**
 * Returns the maximum of two vec2's
 *
 * @param {vec2} out the receiving vector
 * @param {vec2} a the first operand
 * @param {vec2} b the second operand
 * @returns {vec2} out
 */
vec2.max = function(out, a, b) {
    out[0] = Math.max(a[0], b[0]);
    out[1] = Math.max(a[1], b[1]);
    return out;
};

/**
 * Scales a vec2 by a scalar number
 *
 * @param {vec2} out the receiving vector
 * @param {vec2} a the vector to scale
 * @param {vec2} b amount to scale the vector by
 * @returns {vec2} out
 */
vec2.scale = function(out, a, b) {
    out[0] = a[0] * b;
    out[1] = a[1] * b;
    return out;
};

/**
 * Calculates the euclidian distance between two vec2's
 *
 * @param {vec2} a the first operand
 * @param {vec2} b the second operand
 * @returns {Number} distance between a and b
 */
vec2.dist = vec2.distance = function(a, b) {
    var x = b[0] - a[0],
        y = b[1] - a[1];
    return Math.sqrt(x*x + y*y);
};

/**
 * Calculates the squared euclidian distance between two vec2's
 *
 * @param {vec2} a the first operand
 * @param {vec2} b the second operand
 * @returns {Number} squared distance between a and b
 */
vec2.sqrDist = vec2.squaredDistance = function(a, b) {
    var x = b[0] - a[0],
        y = b[1] - a[1];
    return x*x + y*y;
};

/**
 * Caclulates the length of a vec2
 *
 * @param {vec2} a vector to calculate length of
 * @returns {Number} length of a
 */
vec2.len = vec2.length = function (a) {
    var x = a[0],
        y = a[1];
    return Math.sqrt(x*x + y*y);
};

/**
 * Caclulates the squared length of a vec2
 *
 * @param {vec2} a vector to calculate squared length of
 * @returns {Number} squared length of a
 */
vec2.sqrLen = vec2.squaredLength = function (a) {
    var x = a[0],
        y = a[1];
    return x*x + y*y;
};

/**
 * Negates the components of a vec2
 *
 * @param {vec2} out the receiving vector
 * @param {vec2} a vector to negate
 * @returns {vec2} out
 */
vec2.negate = function(out, a) {
    out[0] = -a[0];
    out[1] = -a[1];
    return out;
};

/**
 * Normalize a vec2
 *
 * @param {vec2} out the receiving vector
 * @param {vec2} a vector to normalize
 * @returns {vec2} out
 */
vec2.normalize = function(out, a) {
    var x = a[0],
        y = a[1];
    var len = x*x + y*y;
    if (len > 0) {
        //TODO: evaluate use of glm_invsqrt here?
        len = 1 / Math.sqrt(len);
        out[0] = a[0] * len;
        out[1] = a[1] * len;
    }
    return out;
};

/**
 * Caclulates the dot product of two vec2's
 *
 * @param {vec2} a the first operand
 * @param {vec2} b the second operand
 * @returns {Number} dot product of a and b
 */
vec2.dot = function (a, b) {
    return a[0] * b[0] + a[1] * b[1];
};

/**
 * Computes the cross product of two vec2's
 * Note that the cross product must by definition produce a 3D vector
 *
 * @param {vec3} out the receiving vector
 * @param {vec2} a the first operand
 * @param {vec2} b the second operand
 * @returns {vec3} out
 */
vec2.cross = function(out, a, b) {
    var z = a[0] * b[1] - a[1] * b[0];
    out[0] = out[1] = 0;
    out[2] = z;
    return out;
};

/**
 * Performs a linear interpolation between two vec2's
 *
 * @param {vec3} out the receiving vector
 * @param {vec2} a the first operand
 * @param {vec2} b the second operand
 * @param {Number} t interpolation amount between the two inputs
 * @returns {vec2} out
 */
vec2.lerp = function (out, a, b, t) {
    var ax = a[0],
        ay = a[1];
    out[0] = ax + t * (b[0] - ax);
    out[1] = ay + t * (b[1] - ay);
    return out;
};

/**
 * Transforms the vec2 with a mat2
 *
 * @param {vec2} out the receiving vector
 * @param {vec2} a the vector to transform
 * @param {mat2} m matrix to transform with
 * @returns {vec2} out
 */
vec2.transformMat2 = function(out, a, m) {
    var x = a[0],
        y = a[1];
    out[0] = x * m[0] + y * m[1];
    out[1] = x * m[2] + y * m[3];
    return out;
};

/**
 * Perform some operation over an array of vec2s.
 *
 * @param {Array} a the array of vectors to iterate over
 * @param {Number} stride Number of elements between the start of each vec2. If 0 assumes tightly packed
 * @param {Number} offset Number of elements to skip at the beginning of the array
 * @param {Number} count Number of vec2s to iterate over. If 0 iterates over entire array
 * @param {Function} fn Function to call for each vector in the array
 * @param {Object} [arg] additional argument to pass to fn
 * @returns {Array} a
 */
vec2.forEach = (function() {
    var vec = new Float32Array(2);

    return function(a, stride, offset, count, fn, arg) {
        var i, l;
        if(!stride) {
            stride = 2;
        }

        if(!offset) {
            offset = 0;
        }
        
        if(count) {
            l = Math.min((count * stride) + offset, a.length);
        } else {
            l = a.length;
        }

        for(i = offset; i < l; i += stride) {
            vec[0] = a[i]; vec[1] = a[i+1];
            fn(vec, vec, arg);
            a[i] = vec[0]; a[i+1] = vec[1];
        }
        
        return a;
    };
})();

/**
 * Returns a string representation of a vector
 *
 * @param {vec2} vec vector to represent as a string
 * @returns {String} string representation of the vector
 */
vec2.str = function (a) {
    return 'vec2(' + a[0] + ', ' + a[1] + ')';
};

if(typeof(exports) !== 'undefined') {
    exports.vec2 = vec2;
}
;
/* Copyright (c) 2012, Brandon Jones, Colin MacKenzie IV. All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this
    list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation 
    and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

/**
 * @class 3 Dimensional Vector
 * @name vec3
 */

var vec3 = {};

if(!GLMAT_EPSILON) {
    var GLMAT_EPSILON = 0.000001;
}
 
/**
 * Creates a new, empty vec3
 *
 * @returns {vec3} a new 3D vector
 */
vec3.create = function() {
    return new Float32Array(3);
};

/**
 * Creates a new vec3 initialized with values from an existing vector
 *
 * @param {vec3} a vector to clone
 * @returns {vec3} a new 3D vector
 */
vec3.clone = function(a) {
    var out = new Float32Array(3);
    out[0] = a[0];
    out[1] = a[1];
    out[2] = a[2];
    return out;
};

/**
 * Creates a new vec3 initialized with the given values
 *
 * @param {Number} x X component
 * @param {Number} y Y component
 * @param {Number} z Z component
 * @returns {vec3} a new 3D vector
 */
vec3.fromValues = function(x, y, z) {
    var out = new Float32Array(3);
    out[0] = x;
    out[1] = y;
    out[2] = z;
    return out;
};

/**
 * Copy the values from one vec3 to another
 *
 * @param {vec3} out the receiving vector
 * @param {vec3} a the source vector
 * @returns {vec3} out
 */
vec3.copy = function(out, a) {
    out[0] = a[0];
    out[1] = a[1];
    out[2] = a[2];
    return out;
};

/**
 * Set the components of a vec3 to the given values
 *
 * @param {vec3} out the receiving vector
 * @param {Number} x X component
 * @param {Number} y Y component
 * @param {Number} z Z component
 * @returns {vec3} out
 */
vec3.set = function(out, x, y, z) {
    out[0] = x;
    out[1] = y;
    out[2] = z;
    return out;
};

/**
 * Adds two vec3's
 *
 * @param {vec3} out the receiving vector
 * @param {vec3} a the first operand
 * @param {vec3} b the second operand
 * @returns {vec3} out
 */
vec3.add = function(out, a, b) {
    out[0] = a[0] + b[0];
    out[1] = a[1] + b[1];
    out[2] = a[2] + b[2];
    return out;
};

/**
 * Subtracts two vec3's
 *
 * @param {vec3} out the receiving vector
 * @param {vec3} a the first operand
 * @param {vec3} b the second operand
 * @returns {vec3} out
 */
vec3.sub = vec3.subtract = function(out, a, b) {
    out[0] = a[0] - b[0];
    out[1] = a[1] - b[1];
    out[2] = a[2] - b[2];
    return out;
};

/**
 * Multiplies two vec3's
 *
 * @param {vec3} out the receiving vector
 * @param {vec3} a the first operand
 * @param {vec3} b the second operand
 * @returns {vec3} out
 */
vec3.mul = vec3.multiply = function(out, a, b) {
    out[0] = a[0] * b[0];
    out[1] = a[1] * b[1];
    out[2] = a[2] * b[2];
    return out;
};

/**
 * Divides two vec3's
 *
 * @param {vec3} out the receiving vector
 * @param {vec3} a the first operand
 * @param {vec3} b the second operand
 * @returns {vec3} out
 */
vec3.div = vec3.divide = function(out, a, b) {
    out[0] = a[0] / b[0];
    out[1] = a[1] / b[1];
    out[2] = a[2] / b[2];
    return out;
};

/**
 * Returns the minimum of two vec3's
 *
 * @param {vec3} out the receiving vector
 * @param {vec3} a the first operand
 * @param {vec3} b the second operand
 * @returns {vec3} out
 */
vec3.min = function(out, a, b) {
    out[0] = Math.min(a[0], b[0]);
    out[1] = Math.min(a[1], b[1]);
    out[2] = Math.min(a[2], b[2]);
    return out;
};

/**
 * Returns the maximum of two vec3's
 *
 * @param {vec3} out the receiving vector
 * @param {vec3} a the first operand
 * @param {vec3} b the second operand
 * @returns {vec3} out
 */
vec3.max = function(out, a, b) {
    out[0] = Math.max(a[0], b[0]);
    out[1] = Math.max(a[1], b[1]);
    out[2] = Math.max(a[2], b[2]);
    return out;
};

/**
 * Scales a vec3 by a scalar number
 *
 * @param {vec3} out the receiving vector
 * @param {vec3} a the vector to scale
 * @param {vec3} b amount to scale the vector by
 * @returns {vec3} out
 */
vec3.scale = function(out, a, b) {
    out[0] = a[0] * b;
    out[1] = a[1] * b;
    out[2] = a[2] * b;
    return out;
};

/**
 * Calculates the euclidian distance between two vec3's
 *
 * @param {vec3} a the first operand
 * @param {vec3} b the second operand
 * @returns {Number} distance between a and b
 */
vec3.dist = vec3.distance = function(a, b) {
    var x = b[0] - a[0],
        y = b[1] - a[1],
        z = b[2] - a[2];
    return Math.sqrt(x*x + y*y + z*z);
};

/**
 * Calculates the squared euclidian distance between two vec3's
 *
 * @param {vec3} a the first operand
 * @param {vec3} b the second operand
 * @returns {Number} squared distance between a and b
 */
vec3.sqrDist = vec3.squaredDistance = function(a, b) {
    var x = b[0] - a[0],
        y = b[1] - a[1],
        z = b[2] - a[2];
    return x*x + y*y + z*z;
};

/**
 * Caclulates the length of a vec3
 *
 * @param {vec3} a vector to calculate length of
 * @returns {Number} length of a
 */
vec3.len = vec3.length = function (a) {
    var x = a[0],
        y = a[1],
        z = a[2];
    return Math.sqrt(x*x + y*y + z*z);
};

/**
 * Caclulates the squared length of a vec3
 *
 * @param {vec3} a vector to calculate squared length of
 * @returns {Number} squared length of a
 */
vec3.sqrLen = vec3.squaredLength = function (a) {
    var x = a[0],
        y = a[1],
        z = a[2];
    return x*x + y*y + z*z;
};

/**
 * Negates the components of a vec3
 *
 * @param {vec3} out the receiving vector
 * @param {vec3} a vector to negate
 * @returns {vec3} out
 */
vec3.negate = function(out, a) {
    out[0] = -a[0];
    out[1] = -a[1];
    out[2] = -a[2];
    return out;
};

/**
 * Normalize a vec3
 *
 * @param {vec3} out the receiving vector
 * @param {vec3} a vector to normalize
 * @returns {vec3} out
 */
vec3.normalize = function(out, a) {
    var x = a[0],
        y = a[1],
        z = a[2];
    var len = x*x + y*y + z*z;
    if (len > 0) {
        //TODO: evaluate use of glm_invsqrt here?
        len = 1 / Math.sqrt(len);
        out[0] = a[0] * len;
        out[1] = a[1] * len;
        out[2] = a[2] * len;
    }
    return out;
};

/**
 * Caclulates the dot product of two vec3's
 *
 * @param {vec3} a the first operand
 * @param {vec3} b the second operand
 * @returns {Number} dot product of a and b
 */
vec3.dot = function (a, b) {
    return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
};

/**
 * Computes the cross product of two vec3's
 *
 * @param {vec3} out the receiving vector
 * @param {vec3} a the first operand
 * @param {vec3} b the second operand
 * @returns {vec3} out
 */
vec3.cross = function(out, a, b) {
    var ax = a[0], ay = a[1], az = a[2],
        bx = b[0], by = b[1], bz = b[2];

    out[0] = ay * bz - az * by;
    out[1] = az * bx - ax * bz;
    out[2] = ax * by - ay * bx;
    return out;
};

/**
 * Performs a linear interpolation between two vec3's
 *
 * @param {vec3} out the receiving vector
 * @param {vec3} a the first operand
 * @param {vec3} b the second operand
 * @param {Number} t interpolation amount between the two inputs
 * @returns {vec3} out
 */
vec3.lerp = function (out, a, b, t) {
    var ax = a[0],
        ay = a[1],
        az = a[2];
    out[0] = ax + t * (b[0] - ax);
    out[1] = ay + t * (b[1] - ay);
    out[2] = az + t * (b[2] - az);
    return out;
};

/**
 * Transforms the vec3 with a mat4.
 * 4th vector component is implicitly '1'
 *
 * @param {vec3} out the receiving vector
 * @param {vec3} a the vector to transform
 * @param {mat4} m matrix to transform with
 * @returns {vec3} out
 */
vec3.transformMat4 = function(out, a, m) {
    var x = a[0], y = a[1], z = a[2];
    out[0] = m[0] * x + m[4] * y + m[8] * z + m[12];
    out[1] = m[1] * x + m[5] * y + m[9] * z + m[13];
    out[2] = m[2] * x + m[6] * y + m[10] * z + m[14];
    return out;
};

/**
 * Transforms the vec3 with a quat
 *
 * @param {vec3} out the receiving vector
 * @param {vec3} a the vector to transform
 * @param {quat} q quaternion to transform with
 * @returns {vec3} out
 */
vec3.transformQuat = function(out, a, q) {
    var x = a[0], y = a[1], z = a[2],
        qx = q[0], qy = q[1], qz = q[2], qw = q[3],

        // calculate quat * vec
        ix = qw * x + qy * z - qz * y,
        iy = qw * y + qz * x - qx * z,
        iz = qw * z + qx * y - qy * x,
        iw = -qx * x - qy * y - qz * z;

    // calculate result * inverse quat
    out[0] = ix * qw + iw * -qx + iy * -qz - iz * -qy;
    out[1] = iy * qw + iw * -qy + iz * -qx - ix * -qz;
    out[2] = iz * qw + iw * -qz + ix * -qy - iy * -qx;
    return out;
};

/**
 * Perform some operation over an array of vec3s.
 *
 * @param {Array} a the array of vectors to iterate over
 * @param {Number} stride Number of elements between the start of each vec3. If 0 assumes tightly packed
 * @param {Number} offset Number of elements to skip at the beginning of the array
 * @param {Number} count Number of vec3s to iterate over. If 0 iterates over entire array
 * @param {Function} fn Function to call for each vector in the array
 * @param {Object} [arg] additional argument to pass to fn
 * @returns {Array} a
 */
vec3.forEach = (function() {
    var vec = new Float32Array(3);

    return function(a, stride, offset, count, fn, arg) {
        var i, l;
        if(!stride) {
            stride = 3;
        }

        if(!offset) {
            offset = 0;
        }
        
        if(count) {
            l = Math.min((count * stride) + offset, a.length);
        } else {
            l = a.length;
        }

        for(i = offset; i < l; i += stride) {
            vec[0] = a[i]; vec[1] = a[i+1]; vec[2] = a[i+2];
            fn(vec, vec, arg);
            a[i] = vec[0]; a[i+1] = vec[1]; a[i+2] = vec[2];
        }
        
        return a;
    };
})();

/**
 * Returns a string representation of a vector
 *
 * @param {vec3} vec vector to represent as a string
 * @returns {String} string representation of the vector
 */
vec3.str = function (a) {
    return 'vec3(' + a[0] + ', ' + a[1] + ', ' + a[2] + ')';
};

if(typeof(exports) !== 'undefined') {
    exports.vec3 = vec3;
}
;
/* Copyright (c) 2012, Brandon Jones, Colin MacKenzie IV. All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this
    list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation 
    and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

/**
 * @class 4 Dimensional Vector
 * @name vec4
 */

var vec4 = {};

if(!GLMAT_EPSILON) {
    var GLMAT_EPSILON = 0.000001;
}

/**
 * Creates a new, empty vec4
 *
 * @returns {vec4} a new 4D vector
 */
vec4.create = function() {
    return new Float32Array(4);
};

/**
 * Creates a new vec4 initialized with values from an existing vector
 *
 * @param {vec4} a vector to clone
 * @returns {vec4} a new 4D vector
 */
vec4.clone = function(a) {
    var out = new Float32Array(4);
    out[0] = a[0];
    out[1] = a[1];
    out[2] = a[2];
    out[3] = a[3];
    return out;
};

/**
 * Creates a new vec4 initialized with the given values
 *
 * @param {Number} x X component
 * @param {Number} y Y component
 * @param {Number} z Z component
 * @param {Number} w W component
 * @returns {vec4} a new 4D vector
 */
vec4.fromValues = function(x, y, z, w) {
    var out = new Float32Array(4);
    out[0] = x;
    out[1] = y;
    out[2] = z;
    out[3] = w;
    return out;
};

/**
 * Copy the values from one vec4 to another
 *
 * @param {vec4} out the receiving vector
 * @param {vec4} a the source vector
 * @returns {vec4} out
 */
vec4.copy = function(out, a) {
    out[0] = a[0];
    out[1] = a[1];
    out[2] = a[2];
    out[3] = a[3];
    return out;
};

/**
 * Set the components of a vec4 to the given values
 *
 * @param {vec4} out the receiving vector
 * @param {Number} x X component
 * @param {Number} y Y component
 * @param {Number} z Z component
 * @param {Number} w W component
 * @returns {vec4} out
 */
vec4.set = function(out, x, y, z, w) {
    out[0] = x;
    out[1] = y;
    out[2] = z;
    out[3] = w;
    return out;
};

/**
 * Adds two vec4's
 *
 * @param {vec4} out the receiving vector
 * @param {vec4} a the first operand
 * @param {vec4} b the second operand
 * @returns {vec4} out
 */
vec4.add = function(out, a, b) {
    out[0] = a[0] + b[0];
    out[1] = a[1] + b[1];
    out[2] = a[2] + b[2];
    out[3] = a[3] + b[3];
    return out;
};

/**
 * Subtracts two vec4's
 *
 * @param {vec4} out the receiving vector
 * @param {vec4} a the first operand
 * @param {vec4} b the second operand
 * @returns {vec4} out
 */
vec4.sub = vec4.subtract = function(out, a, b) {
    out[0] = a[0] - b[0];
    out[1] = a[1] - b[1];
    out[2] = a[2] - b[2];
    out[3] = a[3] - b[3];
    return out;
};

/**
 * Multiplies two vec4's
 *
 * @param {vec4} out the receiving vector
 * @param {vec4} a the first operand
 * @param {vec4} b the second operand
 * @returns {vec4} out
 */
vec4.mul = vec4.multiply = function(out, a, b) {
    out[0] = a[0] * b[0];
    out[1] = a[1] * b[1];
    out[2] = a[2] * b[2];
    out[3] = a[3] * b[3];
    return out;
};

/**
 * Divides two vec4's
 *
 * @param {vec4} out the receiving vector
 * @param {vec4} a the first operand
 * @param {vec4} b the second operand
 * @returns {vec4} out
 */
vec4.div = vec4.divide = function(out, a, b) {
    out[0] = a[0] / b[0];
    out[1] = a[1] / b[1];
    out[2] = a[2] / b[2];
    out[3] = a[3] / b[3];
    return out;
};

/**
 * Returns the minimum of two vec4's
 *
 * @param {vec4} out the receiving vector
 * @param {vec4} a the first operand
 * @param {vec4} b the second operand
 * @returns {vec4} out
 */
vec4.min = function(out, a, b) {
    out[0] = Math.min(a[0], b[0]);
    out[1] = Math.min(a[1], b[1]);
    out[2] = Math.min(a[2], b[2]);
    out[3] = Math.min(a[3], b[3]);
    return out;
};

/**
 * Returns the maximum of two vec4's
 *
 * @param {vec4} out the receiving vector
 * @param {vec4} a the first operand
 * @param {vec4} b the second operand
 * @returns {vec4} out
 */
vec4.max = function(out, a, b) {
    out[0] = Math.max(a[0], b[0]);
    out[1] = Math.max(a[1], b[1]);
    out[2] = Math.max(a[2], b[2]);
    out[3] = Math.max(a[3], b[3]);
    return out;
};

/**
 * Scales a vec4 by a scalar number
 *
 * @param {vec4} out the receiving vector
 * @param {vec4} a the vector to scale
 * @param {vec4} b amount to scale the vector by
 * @returns {vec4} out
 */
vec4.scale = function(out, a, b) {
    out[0] = a[0] * b;
    out[1] = a[1] * b;
    out[2] = a[2] * b;
    out[3] = a[3] * b;
    return out;
};

/**
 * Calculates the euclidian distance between two vec4's
 *
 * @param {vec4} a the first operand
 * @param {vec4} b the second operand
 * @returns {Number} distance between a and b
 */
vec4.dist = vec4.distance = function(a, b) {
    var x = b[0] - a[0],
        y = b[1] - a[1],
        z = b[2] - a[2],
        w = b[3] - a[3];
    return Math.sqrt(x*x + y*y + z*z + w*w);
};

/**
 * Calculates the squared euclidian distance between two vec4's
 *
 * @param {vec4} a the first operand
 * @param {vec4} b the second operand
 * @returns {Number} squared distance between a and b
 */
vec4.sqrDist = vec4.squaredDistance = function(a, b) {
    var x = b[0] - a[0],
        y = b[1] - a[1],
        z = b[2] - a[2],
        w = b[3] - a[3];
    return x*x + y*y + z*z + w*w;
};

/**
 * Caclulates the length of a vec4
 *
 * @param {vec4} a vector to calculate length of
 * @returns {Number} length of a
 */
vec4.len = vec4.length = function (a) {
    var x = a[0],
        y = a[1],
        z = a[2],
        w = a[3];
    return Math.sqrt(x*x + y*y + z*z + w*w);
};

/**
 * Caclulates the squared length of a vec4
 *
 * @param {vec4} a vector to calculate squared length of
 * @returns {Number} squared length of a
 */
vec4.sqrLen = vec4.squaredLength = function (a) {
    var x = a[0],
        y = a[1],
        z = a[2],
        w = a[3];
    return x*x + y*y + z*z + w*w;
};

/**
 * Negates the components of a vec4
 *
 * @param {vec4} out the receiving vector
 * @param {vec4} a vector to negate
 * @returns {vec4} out
 */
vec4.negate = function(out, a) {
    out[0] = -a[0];
    out[1] = -a[1];
    out[2] = -a[2];
    out[3] = -a[3];
    return out;
};

/**
 * Normalize a vec4
 *
 * @param {vec4} out the receiving vector
 * @param {vec4} a vector to normalize
 * @returns {vec4} out
 */
vec4.normalize = function(out, a) {
    var x = a[0],
        y = a[1],
        z = a[2],
        w = a[3];
    var len = x*x + y*y + z*z + w*w;
    if (len > 0) {
        len = 1 / Math.sqrt(len);
        out[0] = a[0] * len;
        out[1] = a[1] * len;
        out[2] = a[2] * len;
        out[3] = a[3] * len;
    }
    return out;
};

/**
 * Caclulates the dot product of two vec4's
 *
 * @param {vec4} a the first operand
 * @param {vec4} b the second operand
 * @returns {Number} dot product of a and b
 */
vec4.dot = function (a, b) {
    return a[0] * b[0] + a[1] * b[1] + a[2] * b[2] + a[3] * b[3];
};

/**
 * Performs a linear interpolation between two vec4's
 *
 * @param {vec4} out the receiving vector
 * @param {vec4} a the first operand
 * @param {vec4} b the second operand
 * @param {Number} t interpolation amount between the two inputs
 * @returns {vec4} out
 */
vec4.lerp = function (out, a, b, t) {
    var ax = a[0],
        ay = a[1],
        az = a[2],
        aw = a[3];
    out[0] = ax + t * (b[0] - ax);
    out[1] = ay + t * (b[1] - ay);
    out[2] = az + t * (b[2] - az);
    out[3] = aw + t * (b[3] - aw);
    return out;
};

/**
 * Transforms the vec4 with a mat4.
 *
 * @param {vec4} out the receiving vector
 * @param {vec4} a the vector to transform
 * @param {mat4} m matrix to transform with
 * @returns {vec4} out
 */
vec4.transformMat4 = function(out, a, m) {
    var x = a[0], y = a[1], z = a[2], w = a[3];
    out[0] = m[0] * x + m[4] * y + m[8] * z + m[12] * w;
    out[1] = m[1] * x + m[5] * y + m[9] * z + m[13] * w;
    out[2] = m[2] * x + m[6] * y + m[10] * z + m[14] * w;
    out[3] = m[3] * x + m[7] * y + m[11] * z + m[15] * w;
    return out;
};

/**
 * Transforms the vec4 with a quat
 *
 * @param {vec4} out the receiving vector
 * @param {vec4} a the vector to transform
 * @param {quat} q quaternion to transform with
 * @returns {vec4} out
 */
vec4.transformQuat = function(out, a, q) {
    var x = a[0], y = a[1], z = a[2],
        qx = q[0], qy = q[1], qz = q[2], qw = q[3],

        // calculate quat * vec
        ix = qw * x + qy * z - qz * y,
        iy = qw * y + qz * x - qx * z,
        iz = qw * z + qx * y - qy * x,
        iw = -qx * x - qy * y - qz * z;

    // calculate result * inverse quat
    out[0] = ix * qw + iw * -qx + iy * -qz - iz * -qy;
    out[1] = iy * qw + iw * -qy + iz * -qx - ix * -qz;
    out[2] = iz * qw + iw * -qz + ix * -qy - iy * -qx;
    return out;
};

/**
 * Perform some operation over an array of vec4s.
 *
 * @param {Array} a the array of vectors to iterate over
 * @param {Number} stride Number of elements between the start of each vec4. If 0 assumes tightly packed
 * @param {Number} offset Number of elements to skip at the beginning of the array
 * @param {Number} count Number of vec2s to iterate over. If 0 iterates over entire array
 * @param {Function} fn Function to call for each vector in the array
 * @param {Object} [arg] additional argument to pass to fn
 * @returns {Array} a
 */
vec4.forEach = (function() {
    var vec = new Float32Array(4);

    return function(a, stride, offset, count, fn, arg) {
        var i, l;
        if(!stride) {
            stride = 4;
        }

        if(!offset) {
            offset = 0;
        }
        
        if(count) {
            l = Math.min((count * stride) + offset, a.length);
        } else {
            l = a.length;
        }

        for(i = offset; i < l; i += stride) {
            vec[0] = a[i]; vec[1] = a[i+1]; vec[2] = a[i+2]; vec[3] = a[i+3];
            fn(vec, vec, arg);
            a[i] = vec[0]; a[i+1] = vec[1]; a[i+2] = vec[2]; a[i+3] = vec[3];
        }
        
        return a;
    };
})();

/**
 * Returns a string representation of a vector
 *
 * @param {vec4} vec vector to represent as a string
 * @returns {String} string representation of the vector
 */
vec4.str = function (a) {
    return 'vec4(' + a[0] + ', ' + a[1] + ', ' + a[2] + ', ' + a[3] + ')';
};

if(typeof(exports) !== 'undefined') {
    exports.vec4 = vec4;
}
;
/* Copyright (c) 2012, Brandon Jones, Colin MacKenzie IV. All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this
    list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation 
    and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

/**
 * @class 2x2 Matrix
 * @name mat2
 */

var mat2 = {};

var mat2Identity = new Float32Array([
    1, 0,
    0, 1
]);

if(!GLMAT_EPSILON) {
    var GLMAT_EPSILON = 0.000001;
}

/**
 * Creates a new identity mat2
 *
 * @returns {mat2} a new 2x2 matrix
 */
mat2.create = function() {
    return new Float32Array(mat2Identity);
};

/**
 * Creates a new mat2 initialized with values from an existing matrix
 *
 * @param {mat2} a matrix to clone
 * @returns {mat2} a new 2x2 matrix
 */
mat2.clone = function(a) {
    var out = new Float32Array(4);
    out[0] = a[0];
    out[1] = a[1];
    out[2] = a[2];
    out[3] = a[3];
    return out;
};

/**
 * Copy the values from one mat2 to another
 *
 * @param {mat2} out the receiving matrix
 * @param {mat2} a the source matrix
 * @returns {mat2} out
 */
mat2.copy = function(out, a) {
    out[0] = a[0];
    out[1] = a[1];
    out[2] = a[2];
    out[3] = a[3];
    return out;
};

/**
 * Set a mat2 to the identity matrix
 *
 * @param {mat2} out the receiving matrix
 * @returns {mat2} out
 */
mat2.identity = function(out) {
    out[0] = 1;
    out[1] = 0;
    out[2] = 0;
    out[3] = 1;
    return out;
};

/**
 * Transpose the values of a mat2
 *
 * @param {mat2} out the receiving matrix
 * @param {mat2} a the source matrix
 * @returns {mat2} out
 */
mat2.transpose = function(out, a) {
    // If we are transposing ourselves we can skip a few steps but have to cache some values
    if (out === a) {
        var a1 = a[1];
        out[1] = a[2];
        out[2] = a1;
    } else {
        out[0] = a[0];
        out[1] = a[2];
        out[2] = a[1];
        out[3] = a[3];
    }
    
    return out;
};

/**
 * Inverts a mat2
 *
 * @param {mat2} out the receiving matrix
 * @param {mat2} a the source matrix
 * @returns {mat2} out
 */
mat2.invert = function(out, a) {
    var a0 = a[0], a1 = a[1], a2 = a[2], a3 = a[3],

        // Calculate the determinant
        det = a0 * a3 - a2 * a1;

    if (!det) {
        return null;
    }
    det = 1.0 / det;
    
    out[0] =  a3 * det;
    out[1] = -a1 * det;
    out[2] = -a2 * det;
    out[3] =  a0 * det;

    return out;
};

/**
 * Caclulates the adjugate of a mat2
 *
 * @param {mat2} out the receiving matrix
 * @param {mat2} a the source matrix
 * @returns {mat2} out
 */
mat2.adjoint = function(out, a) {
    // Caching this value is nessecary if out == a
    var a0 = a[0];
    out[0] =  a[3];
    out[1] = -a[1];
    out[2] = -a[2];
    out[3] =  a0;

    return out;
};

/**
 * Calculates the determinant of a mat2
 *
 * @param {mat2} a the source matrix
 * @returns {Number} determinant of a
 */
mat2.determinant = function (a) {
    return a[0] * a[3] - a[2] * a[1];
};

/**
 * Multiplies two mat2's
 *
 * @param {mat2} out the receiving matrix
 * @param {mat2} a the first operand
 * @param {mat2} b the second operand
 * @returns {mat2} out
 */
mat2.mul = mat2.multiply = function (out, a, b) {
    var a0 = a[0], a1 = a[1], a2 = a[2], a3 = a[3];
    var b0 = b[0], b1 = b[1], b2 = b[2], b3 = b[3];
    out[0] = a0 * b0 + a1 * b2;
    out[1] = a0 * b1 + a1 * b3;
    out[2] = a2 * b0 + a3 * b2;
    out[3] = a2 * b1 + a3 * b3;
    return out;
};

/**
 * Rotates a mat2 by the given angle
 *
 * @param {mat2} out the receiving matrix
 * @param {mat2} a the matrix to rotate
 * @param {mat2} rad the angle to rotate the matrix by
 * @returns {mat2} out
 */
mat2.rotate = function (out, a, rad) {
    var a0 = a[0], a1 = a[1], a2 = a[2], a3 = a[3],
        s = Math.sin(rad),
        c = Math.cos(rad);
    out[0] = a0 *  c + a1 * s;
    out[1] = a0 * -s + a1 * c;
    out[2] = a2 *  c + a3 * s;
    out[3] = a2 * -s + a3 * c;
    return out;
};

/**
 * Scales the mat2 by the dimensions in the given vec2
 *
 * @param {mat2} out the receiving matrix
 * @param {mat2} a the matrix to rotate
 * @param {mat2} v the vec2 to scale the matrix by
 * @returns {mat2} out
 **/
mat2.scale = function(out, a, v) {
    var a0 = a[0], a1 = a[1], a2 = a[2], a3 = a[3],
        v0 = v[0], v1 = v[1];
    out[0] = a0 * v0;
    out[1] = a1 * v1;
    out[2] = a2 * v0;
    out[3] = a3 * v1;
    return out;
};

/**
 * Returns a string representation of a mat2
 *
 * @param {mat2} mat matrix to represent as a string
 * @returns {String} string representation of the matrix
 */
mat2.str = function (a) {
    return 'mat2(' + a[0] + ', ' + a[1] + ', ' + a[2] + ', ' + a[3] + ')';
};

if(typeof(exports) !== 'undefined') {
    exports.mat2 = mat2;
}
;
/* Copyright (c) 2012, Brandon Jones, Colin MacKenzie IV. All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this
    list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation 
    and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

/**
 * @class 3x3 Matrix
 * @name mat3
 */

var mat3 = {};

var mat3Identity = new Float32Array([
    1, 0, 0,
    0, 1, 0,
    0, 0, 1
]);

if(!GLMAT_EPSILON) {
    var GLMAT_EPSILON = 0.000001;
}

/**
 * Creates a new identity mat3
 *
 * @returns {mat3} a new 3x3 matrix
 */
mat3.create = function() {
    return new Float32Array(mat3Identity);
};

/**
 * Creates a new mat3 initialized with values from an existing matrix
 *
 * @param {mat3} a matrix to clone
 * @returns {mat3} a new 3x3 matrix
 */
mat3.clone = function(a) {
    var out = new Float32Array(9);
    out[0] = a[0];
    out[1] = a[1];
    out[2] = a[2];
    out[3] = a[3];
    out[4] = a[4];
    out[5] = a[5];
    out[6] = a[6];
    out[7] = a[7];
    out[8] = a[8];
    return out;
};

/**
 * Copy the values from one mat3 to another
 *
 * @param {mat3} out the receiving matrix
 * @param {mat3} a the source matrix
 * @returns {mat3} out
 */
mat3.copy = function(out, a) {
    out[0] = a[0];
    out[1] = a[1];
    out[2] = a[2];
    out[3] = a[3];
    out[4] = a[4];
    out[5] = a[5];
    out[6] = a[6];
    out[7] = a[7];
    out[8] = a[8];
    return out;
};

/**
 * Set a mat3 to the identity matrix
 *
 * @param {mat3} out the receiving matrix
 * @returns {mat3} out
 */
mat3.identity = function(out) {
    out[0] = 1;
    out[1] = 0;
    out[2] = 0;
    out[3] = 0;
    out[4] = 1;
    out[5] = 0;
    out[6] = 0;
    out[7] = 0;
    out[8] = 1;
    return out;
};

/**
 * Transpose the values of a mat3
 *
 * @param {mat3} out the receiving matrix
 * @param {mat3} a the source matrix
 * @returns {mat3} out
 */
mat3.transpose = function(out, a) {
    // If we are transposing ourselves we can skip a few steps but have to cache some values
    if (out === a) {
        var a01 = a[1], a02 = a[2], a12 = a[5];
        out[1] = a[3];
        out[2] = a[6];
        out[3] = a01;
        out[5] = a[7];
        out[6] = a02;
        out[7] = a12;
    } else {
        out[0] = a[0];
        out[1] = a[3];
        out[2] = a[6];
        out[3] = a[1];
        out[4] = a[4];
        out[5] = a[7];
        out[6] = a[2];
        out[7] = a[5];
        out[8] = a[8];
    }
    
    return out;
};

/**
 * Inverts a mat3
 *
 * @param {mat3} out the receiving matrix
 * @param {mat3} a the source matrix
 * @returns {mat3} out
 */
mat3.invert = function(out, a) {
    var a00 = a[0], a01 = a[1], a02 = a[2],
        a10 = a[3], a11 = a[4], a12 = a[5],
        a20 = a[6], a21 = a[7], a22 = a[8],

        b01 = a22 * a11 - a12 * a21,
        b11 = -a22 * a10 + a12 * a20,
        b21 = a21 * a10 - a11 * a20,

        // Calculate the determinant
        det = a00 * b01 + a01 * b11 + a02 * b21;

    if (!det) { 
        return null; 
    }
    det = 1.0 / det;

    out[0] = b01 * det;
    out[1] = (-a22 * a01 + a02 * a21) * det;
    out[2] = (a12 * a01 - a02 * a11) * det;
    out[3] = b11 * det;
    out[4] = (a22 * a00 - a02 * a20) * det;
    out[5] = (-a12 * a00 + a02 * a10) * det;
    out[6] = b21 * det;
    out[7] = (-a21 * a00 + a01 * a20) * det;
    out[8] = (a11 * a00 - a01 * a10) * det;
    return out;
};

/**
 * Caclulates the adjugate of a mat3
 *
 * @param {mat3} out the receiving matrix
 * @param {mat3} a the source matrix
 * @returns {mat3} out
 */
mat3.adjoint = function(out, a) {
    var a00 = a[0], a01 = a[1], a02 = a[2],
        a10 = a[3], a11 = a[4], a12 = a[5],
        a20 = a[6], a21 = a[7], a22 = a[8];

    out[0] = (a11 * a22 - a12 * a21);
    out[1] = (a02 * a21 - a01 * a22);
    out[2] = (a01 * a12 - a02 * a11);
    out[3] = (a12 * a20 - a10 * a22);
    out[4] = (a00 * a22 - a02 * a20);
    out[5] = (a02 * a10 - a00 * a12);
    out[6] = (a10 * a21 - a11 * a20);
    out[7] = (a01 * a20 - a00 * a21);
    out[8] = (a00 * a11 - a01 * a10);
    return out;
};

/**
 * Calculates the determinant of a mat3
 *
 * @param {mat3} a the source matrix
 * @returns {Number} determinant of a
 */
mat3.determinant = function (a) {
    var a00 = a[0], a01 = a[1], a02 = a[2],
        a10 = a[3], a11 = a[4], a12 = a[5],
        a20 = a[6], a21 = a[7], a22 = a[8];

    return a00 * (a22 * a11 - a12 * a21) + a01 * (-a22 * a10 + a12 * a20) + a02 * (a21 * a10 - a11 * a20);
};

/**
 * Multiplies two mat3's
 *
 * @param {mat3} out the receiving matrix
 * @param {mat3} a the first operand
 * @param {mat3} b the second operand
 * @returns {mat3} out
 */
mat3.mul = mat3.multiply = function (out, a, b) {
    var a00 = a[0], a01 = a[1], a02 = a[2],
        a10 = a[3], a11 = a[4], a12 = a[5],
        a20 = a[6], a21 = a[7], a22 = a[8],

        b00 = b[0], b01 = b[1], b02 = b[2],
        b10 = b[3], b11 = b[4], b12 = b[5],
        b20 = b[6], b21 = b[7], b22 = b[8];

    out[0] = b00 * a00 + b01 * a10 + b02 * a20;
    out[1] = b00 * a01 + b01 * a11 + b02 * a21;
    out[2] = b00 * a02 + b01 * a12 + b02 * a22;

    out[3] = b10 * a00 + b11 * a10 + b12 * a20;
    out[4] = b10 * a01 + b11 * a11 + b12 * a21;
    out[5] = b10 * a02 + b11 * a12 + b12 * a22;

    out[6] = b20 * a00 + b21 * a10 + b22 * a20;
    out[7] = b20 * a01 + b21 * a11 + b22 * a21;
    out[8] = b20 * a02 + b21 * a12 + b22 * a22;
    return out;
};

/**
 * Returns a string representation of a mat3
 *
 * @param {mat3} mat matrix to represent as a string
 * @returns {String} string representation of the matrix
 */
mat3.str = function (a) {
    return 'mat3(' + a[0] + ', ' + a[1] + ', ' + a[2] + ', ' + 
                    a[3] + ', ' + a[4] + ', ' + a[5] + ', ' + 
                    a[6] + ', ' + a[7] + ', ' + a[8] + ')';
};

if(typeof(exports) !== 'undefined') {
    exports.mat3 = mat3;
}
;
/* Copyright (c) 2012, Brandon Jones, Colin MacKenzie IV. All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this
    list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation 
    and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

/**
 * @class 4x4 Matrix
 * @name mat4
 */

var mat4 = {};

var mat4Identity = new Float32Array([
    1, 0, 0, 0,
    0, 1, 0, 0,
    0, 0, 1, 0,
    0, 0, 0, 1
]);

if(!GLMAT_EPSILON) {
    var GLMAT_EPSILON = 0.000001;
}

/**
 * Creates a new identity mat4
 *
 * @returns {mat4} a new 4x4 matrix
 */
mat4.create = function() {
    return new Float32Array(mat4Identity);
};

/**
 * Creates a new mat4 initialized with values from an existing matrix
 *
 * @param {mat4} a matrix to clone
 * @returns {mat4} a new 4x4 matrix
 */
mat4.clone = function(a) {
    var out = new Float32Array(16);
    out[0] = a[0];
    out[1] = a[1];
    out[2] = a[2];
    out[3] = a[3];
    out[4] = a[4];
    out[5] = a[5];
    out[6] = a[6];
    out[7] = a[7];
    out[8] = a[8];
    out[9] = a[9];
    out[10] = a[10];
    out[11] = a[11];
    out[12] = a[12];
    out[13] = a[13];
    out[14] = a[14];
    out[15] = a[15];
    return out;
};

/**
 * Copy the values from one mat4 to another
 *
 * @param {mat4} out the receiving matrix
 * @param {mat4} a the source matrix
 * @returns {mat4} out
 */
mat4.copy = function(out, a) {
    out[0] = a[0];
    out[1] = a[1];
    out[2] = a[2];
    out[3] = a[3];
    out[4] = a[4];
    out[5] = a[5];
    out[6] = a[6];
    out[7] = a[7];
    out[8] = a[8];
    out[9] = a[9];
    out[10] = a[10];
    out[11] = a[11];
    out[12] = a[12];
    out[13] = a[13];
    out[14] = a[14];
    out[15] = a[15];
    return out;
};

/**
 * Set a mat4 to the identity matrix
 *
 * @param {mat4} out the receiving matrix
 * @returns {mat4} out
 */
mat4.identity = function(out) {
    out[0] = 1;
    out[1] = 0;
    out[2] = 0;
    out[3] = 0;
    out[4] = 0;
    out[5] = 1;
    out[6] = 0;
    out[7] = 0;
    out[8] = 0;
    out[9] = 0;
    out[10] = 1;
    out[11] = 0;
    out[12] = 0;
    out[13] = 0;
    out[14] = 0;
    out[15] = 1;
    return out;
};

/**
 * Transpose the values of a mat4
 *
 * @param {mat4} out the receiving matrix
 * @param {mat4} a the source matrix
 * @returns {mat4} out
 */
mat4.transpose = function(out, a) {
    // If we are transposing ourselves we can skip a few steps but have to cache some values
    if (out === a) {
        var a01 = a[1], a02 = a[2], a03 = a[3],
            a12 = a[6], a13 = a[7],
            a23 = a[11];

        out[1] = a[4];
        out[2] = a[8];
        out[3] = a[12];
        out[4] = a01;
        out[6] = a[9];
        out[7] = a[13];
        out[8] = a02;
        out[9] = a12;
        out[11] = a[14];
        out[12] = a03;
        out[13] = a13;
        out[14] = a23;
    } else {
        out[0] = a[0];
        out[1] = a[4];
        out[2] = a[8];
        out[3] = a[12];
        out[4] = a[1];
        out[5] = a[5];
        out[6] = a[9];
        out[7] = a[13];
        out[8] = a[2];
        out[9] = a[6];
        out[10] = a[10];
        out[11] = a[14];
        out[12] = a[3];
        out[13] = a[7];
        out[14] = a[11];
        out[15] = a[15];
    }
    
    return out;
};

/**
 * Inverts a mat4
 *
 * @param {mat4} out the receiving matrix
 * @param {mat4} a the source matrix
 * @returns {mat4} out
 */
mat4.invert = function(out, a) {
    var a00 = a[0], a01 = a[1], a02 = a[2], a03 = a[3],
        a10 = a[4], a11 = a[5], a12 = a[6], a13 = a[7],
        a20 = a[8], a21 = a[9], a22 = a[10], a23 = a[11],
        a30 = a[12], a31 = a[13], a32 = a[14], a33 = a[15],

        b00 = a00 * a11 - a01 * a10,
        b01 = a00 * a12 - a02 * a10,
        b02 = a00 * a13 - a03 * a10,
        b03 = a01 * a12 - a02 * a11,
        b04 = a01 * a13 - a03 * a11,
        b05 = a02 * a13 - a03 * a12,
        b06 = a20 * a31 - a21 * a30,
        b07 = a20 * a32 - a22 * a30,
        b08 = a20 * a33 - a23 * a30,
        b09 = a21 * a32 - a22 * a31,
        b10 = a21 * a33 - a23 * a31,
        b11 = a22 * a33 - a23 * a32,

        // Calculate the determinant
        det = b00 * b11 - b01 * b10 + b02 * b09 + b03 * b08 - b04 * b07 + b05 * b06;

    if (!det) { 
        return null; 
    }
    det = 1.0 / det;

    out[0] = (a11 * b11 - a12 * b10 + a13 * b09) * det;
    out[1] = (a02 * b10 - a01 * b11 - a03 * b09) * det;
    out[2] = (a31 * b05 - a32 * b04 + a33 * b03) * det;
    out[3] = (a22 * b04 - a21 * b05 - a23 * b03) * det;
    out[4] = (a12 * b08 - a10 * b11 - a13 * b07) * det;
    out[5] = (a00 * b11 - a02 * b08 + a03 * b07) * det;
    out[6] = (a32 * b02 - a30 * b05 - a33 * b01) * det;
    out[7] = (a20 * b05 - a22 * b02 + a23 * b01) * det;
    out[8] = (a10 * b10 - a11 * b08 + a13 * b06) * det;
    out[9] = (a01 * b08 - a00 * b10 - a03 * b06) * det;
    out[10] = (a30 * b04 - a31 * b02 + a33 * b00) * det;
    out[11] = (a21 * b02 - a20 * b04 - a23 * b00) * det;
    out[12] = (a11 * b07 - a10 * b09 - a12 * b06) * det;
    out[13] = (a00 * b09 - a01 * b07 + a02 * b06) * det;
    out[14] = (a31 * b01 - a30 * b03 - a32 * b00) * det;
    out[15] = (a20 * b03 - a21 * b01 + a22 * b00) * det;

    return out;
};

/**
 * Caclulates the adjugate of a mat4
 *
 * @param {mat4} out the receiving matrix
 * @param {mat4} a the source matrix
 * @returns {mat4} out
 */
mat4.adjoint = function(out, a) {
    var a00 = a[0], a01 = a[1], a02 = a[2], a03 = a[3],
        a10 = a[4], a11 = a[5], a12 = a[6], a13 = a[7],
        a20 = a[8], a21 = a[9], a22 = a[10], a23 = a[11],
        a30 = a[12], a31 = a[13], a32 = a[14], a33 = a[15];

    out[0]  =  (a11 * (a22 * a33 - a23 * a32) - a21 * (a12 * a33 - a13 * a32) + a31 * (a12 * a23 - a13 * a22));
    out[1]  = -(a01 * (a22 * a33 - a23 * a32) - a21 * (a02 * a33 - a03 * a32) + a31 * (a02 * a23 - a03 * a22));
    out[2]  =  (a01 * (a12 * a33 - a13 * a32) - a11 * (a02 * a33 - a03 * a32) + a31 * (a02 * a13 - a03 * a12));
    out[3]  = -(a01 * (a12 * a23 - a13 * a22) - a11 * (a02 * a23 - a03 * a22) + a21 * (a02 * a13 - a03 * a12));
    out[4]  = -(a10 * (a22 * a33 - a23 * a32) - a20 * (a12 * a33 - a13 * a32) + a30 * (a12 * a23 - a13 * a22));
    out[5]  =  (a00 * (a22 * a33 - a23 * a32) - a20 * (a02 * a33 - a03 * a32) + a30 * (a02 * a23 - a03 * a22));
    out[6]  = -(a00 * (a12 * a33 - a13 * a32) - a10 * (a02 * a33 - a03 * a32) + a30 * (a02 * a13 - a03 * a12));
    out[7]  =  (a00 * (a12 * a23 - a13 * a22) - a10 * (a02 * a23 - a03 * a22) + a20 * (a02 * a13 - a03 * a12));
    out[8]  =  (a10 * (a21 * a33 - a23 * a31) - a20 * (a11 * a33 - a13 * a31) + a30 * (a11 * a23 - a13 * a21));
    out[9]  = -(a00 * (a21 * a33 - a23 * a31) - a20 * (a01 * a33 - a03 * a31) + a30 * (a01 * a23 - a03 * a21));
    out[10] =  (a00 * (a11 * a33 - a13 * a31) - a10 * (a01 * a33 - a03 * a31) + a30 * (a01 * a13 - a03 * a11));
    out[11] = -(a00 * (a11 * a23 - a13 * a21) - a10 * (a01 * a23 - a03 * a21) + a20 * (a01 * a13 - a03 * a11));
    out[12] = -(a10 * (a21 * a32 - a22 * a31) - a20 * (a11 * a32 - a12 * a31) + a30 * (a11 * a22 - a12 * a21));
    out[13] =  (a00 * (a21 * a32 - a22 * a31) - a20 * (a01 * a32 - a02 * a31) + a30 * (a01 * a22 - a02 * a21));
    out[14] = -(a00 * (a11 * a32 - a12 * a31) - a10 * (a01 * a32 - a02 * a31) + a30 * (a01 * a12 - a02 * a11));
    out[15] =  (a00 * (a11 * a22 - a12 * a21) - a10 * (a01 * a22 - a02 * a21) + a20 * (a01 * a12 - a02 * a11));
    return out;
};

/**
 * Calculates the determinant of a mat4
 *
 * @param {mat4} a the source matrix
 * @returns {Number} determinant of a
 */
mat4.determinant = function (a) {
    var a00 = a[0], a01 = a[1], a02 = a[2], a03 = a[3],
        a10 = a[4], a11 = a[5], a12 = a[6], a13 = a[7],
        a20 = a[8], a21 = a[9], a22 = a[10], a23 = a[11],
        a30 = a[12], a31 = a[13], a32 = a[14], a33 = a[15],

        b00 = a00 * a11 - a01 * a10,
        b01 = a00 * a12 - a02 * a10,
        b02 = a00 * a13 - a03 * a10,
        b03 = a01 * a12 - a02 * a11,
        b04 = a01 * a13 - a03 * a11,
        b05 = a02 * a13 - a03 * a12,
        b06 = a20 * a31 - a21 * a30,
        b07 = a20 * a32 - a22 * a30,
        b08 = a20 * a33 - a23 * a30,
        b09 = a21 * a32 - a22 * a31,
        b10 = a21 * a33 - a23 * a31,
        b11 = a22 * a33 - a23 * a32;

    // Calculate the determinant
    return b00 * b11 - b01 * b10 + b02 * b09 + b03 * b08 - b04 * b07 + b05 * b06;
};

/**
 * Multiplies two mat4's
 *
 * @param {mat4} out the receiving matrix
 * @param {mat4} a the first operand
 * @param {mat4} b the second operand
 * @returns {mat4} out
 */
mat4.mul = mat4.multiply = function (out, a, b) {
    var a00 = a[0], a01 = a[1], a02 = a[2], a03 = a[3],
        a10 = a[4], a11 = a[5], a12 = a[6], a13 = a[7],
        a20 = a[8], a21 = a[9], a22 = a[10], a23 = a[11],
        a30 = a[12], a31 = a[13], a32 = a[14], a33 = a[15];

    // Cache only the current line of the second matrix
    var b0  = b[0], b1 = b[1], b2 = b[2], b3 = b[3];  
    out[0] = b0*a00 + b1*a10 + b2*a20 + b3*a30;
    out[1] = b0*a01 + b1*a11 + b2*a21 + b3*a31;
    out[2] = b0*a02 + b1*a12 + b2*a22 + b3*a32;
    out[3] = b0*a03 + b1*a13 + b2*a23 + b3*a33;

    b0 = b[4]; b1 = b[5]; b2 = b[6]; b3 = b[7];
    out[4] = b0*a00 + b1*a10 + b2*a20 + b3*a30;
    out[5] = b0*a01 + b1*a11 + b2*a21 + b3*a31;
    out[6] = b0*a02 + b1*a12 + b2*a22 + b3*a32;
    out[7] = b0*a03 + b1*a13 + b2*a23 + b3*a33;

    b0 = b[8]; b1 = b[9]; b2 = b[10]; b3 = b[11];
    out[8] = b0*a00 + b1*a10 + b2*a20 + b3*a30;
    out[9] = b0*a01 + b1*a11 + b2*a21 + b3*a31;
    out[10] = b0*a02 + b1*a12 + b2*a22 + b3*a32;
    out[11] = b0*a03 + b1*a13 + b2*a23 + b3*a33;

    b0 = b[12]; b1 = b[13]; b2 = b[14]; b3 = b[15];
    out[12] = b0*a00 + b1*a10 + b2*a20 + b3*a30;
    out[13] = b0*a01 + b1*a11 + b2*a21 + b3*a31;
    out[14] = b0*a02 + b1*a12 + b2*a22 + b3*a32;
    out[15] = b0*a03 + b1*a13 + b2*a23 + b3*a33;
    return out;
};

/**
 * Translate a mat4 by the given vector
 *
 * @param {mat4} out the receiving matrix
 * @param {mat4} a the matrix to translate
 * @param {vec3} v vector to translate by
 * @returns {mat4} out
 */
mat4.translate = function (out, a, v) {
    var x = v[0], y = v[1], z = v[2],
        a00, a01, a02, a03,
        a10, a11, a12, a13,
        a20, a21, a22, a23;

    if (a === out) {
        out[12] = a[0] * x + a[4] * y + a[8] * z + a[12];
        out[13] = a[1] * x + a[5] * y + a[9] * z + a[13];
        out[14] = a[2] * x + a[6] * y + a[10] * z + a[14];
        out[15] = a[3] * x + a[7] * y + a[11] * z + a[15];
    } else {
        a00 = a[0]; a01 = a[1]; a02 = a[2]; a03 = a[3];
        a10 = a[4]; a11 = a[5]; a12 = a[6]; a13 = a[7];
        a20 = a[8]; a21 = a[9]; a22 = a[10]; a23 = a[11];

        out[0] = a00; out[1] = a01; out[2] = a02; out[3] = a03;
        out[4] = a10; out[5] = a11; out[6] = a12; out[7] = a13;
        out[8] = a20; out[9] = a21; out[10] = a22; out[11] = a23;

        out[12] = a00 * x + a10 * y + a20 * z + a[12];
        out[13] = a01 * x + a11 * y + a21 * z + a[13];
        out[14] = a02 * x + a12 * y + a22 * z + a[14];
        out[15] = a03 * x + a13 * y + a23 * z + a[15];
    }

    return out;
};

/**
 * Scales the mat4 by the dimensions in the given vec3
 *
 * @param {mat4} out the receiving matrix
 * @param {mat4} a the matrix to scale
 * @param {vec3} v the vec3 to scale the matrix by
 * @returns {mat4} out
 **/
mat4.scale = function(out, a, v) {
    var x = v[0], y = v[1], z = v[2];

    out[0] = a[0] * x;
    out[1] = a[1] * x;
    out[2] = a[2] * x;
    out[3] = a[3] * x;
    out[4] = a[4] * y;
    out[5] = a[5] * y;
    out[6] = a[6] * y;
    out[7] = a[7] * y;
    out[8] = a[8] * z;
    out[9] = a[9] * z;
    out[10] = a[10] * z;
    out[11] = a[11] * z;
    out[12] = a[12];
    out[13] = a[13];
    out[14] = a[14];
    out[15] = a[15];
    return out;
};

/**
 * Rotates a mat4 by the given angle
 *
 * @param {mat4} out the receiving matrix
 * @param {mat4} a the matrix to rotate
 * @param {Number} rad the angle to rotate the matrix by
 * @param {vec3} axis the axis to rotate around
 * @returns {mat4} out
 */
mat4.rotate = function (out, a, rad, axis) {
    var x = axis[0], y = axis[1], z = axis[2],
        len = Math.sqrt(x * x + y * y + z * z),
        s, c, t,
        a00, a01, a02, a03,
        a10, a11, a12, a13,
        a20, a21, a22, a23,
        b00, b01, b02,
        b10, b11, b12,
        b20, b21, b22;

    if (Math.abs(len) < GLMAT_EPSILON) { return null; }
    
    len = 1 / len;
    x *= len;
    y *= len;
    z *= len;

    s = Math.sin(rad);
    c = Math.cos(rad);
    t = 1 - c;

    a00 = a[0]; a01 = a[1]; a02 = a[2]; a03 = a[3];
    a10 = a[4]; a11 = a[5]; a12 = a[6]; a13 = a[7];
    a20 = a[8]; a21 = a[9]; a22 = a[10]; a23 = a[11];

    // Construct the elements of the rotation matrix
    b00 = x * x * t + c; b01 = y * x * t + z * s; b02 = z * x * t - y * s;
    b10 = x * y * t - z * s; b11 = y * y * t + c; b12 = z * y * t + x * s;
    b20 = x * z * t + y * s; b21 = y * z * t - x * s; b22 = z * z * t + c;

    // Perform rotation-specific matrix multiplication
    out[0] = a00 * b00 + a10 * b01 + a20 * b02;
    out[1] = a01 * b00 + a11 * b01 + a21 * b02;
    out[2] = a02 * b00 + a12 * b01 + a22 * b02;
    out[3] = a03 * b00 + a13 * b01 + a23 * b02;
    out[4] = a00 * b10 + a10 * b11 + a20 * b12;
    out[5] = a01 * b10 + a11 * b11 + a21 * b12;
    out[6] = a02 * b10 + a12 * b11 + a22 * b12;
    out[7] = a03 * b10 + a13 * b11 + a23 * b12;
    out[8] = a00 * b20 + a10 * b21 + a20 * b22;
    out[9] = a01 * b20 + a11 * b21 + a21 * b22;
    out[10] = a02 * b20 + a12 * b21 + a22 * b22;
    out[11] = a03 * b20 + a13 * b21 + a23 * b22;

    if (a !== out) { // If the source and destination differ, copy the unchanged last row
        out[12] = a[12];
        out[13] = a[13];
        out[14] = a[14];
        out[15] = a[15];
    }
    return out;
};

/**
 * Rotates a matrix by the given angle around the X axis
 *
 * @param {mat4} out the receiving matrix
 * @param {mat4} a the matrix to rotate
 * @param {Number} rad the angle to rotate the matrix by
 * @returns {mat4} out
 */
mat4.rotateX = function (out, a, rad) {
    var s = Math.sin(rad),
        c = Math.cos(rad),
        a10 = a[4],
        a11 = a[5],
        a12 = a[6],
        a13 = a[7],
        a20 = a[8],
        a21 = a[9],
        a22 = a[10],
        a23 = a[11];

    if (a !== out) { // If the source and destination differ, copy the unchanged rows
        out[0]  = a[0];
        out[1]  = a[1];
        out[2]  = a[2];
        out[3]  = a[3];
        out[12] = a[12];
        out[13] = a[13];
        out[14] = a[14];
        out[15] = a[15];
    }

    // Perform axis-specific matrix multiplication
    out[4] = a10 * c + a20 * s;
    out[5] = a11 * c + a21 * s;
    out[6] = a12 * c + a22 * s;
    out[7] = a13 * c + a23 * s;
    out[8] = a20 * c - a10 * s;
    out[9] = a21 * c - a11 * s;
    out[10] = a22 * c - a12 * s;
    out[11] = a23 * c - a13 * s;
    return out;
};

/**
 * Rotates a matrix by the given angle around the Y axis
 *
 * @param {mat4} out the receiving matrix
 * @param {mat4} a the matrix to rotate
 * @param {Number} rad the angle to rotate the matrix by
 * @returns {mat4} out
 */
mat4.rotateY = function (out, a, rad) {
    var s = Math.sin(rad),
        c = Math.cos(rad),
        a00 = a[0],
        a01 = a[1],
        a02 = a[2],
        a03 = a[3],
        a20 = a[8],
        a21 = a[9],
        a22 = a[10],
        a23 = a[11];

    if (a !== out) { // If the source and destination differ, copy the unchanged rows
        out[4]  = a[4];
        out[5]  = a[5];
        out[6]  = a[6];
        out[7]  = a[7];
        out[12] = a[12];
        out[13] = a[13];
        out[14] = a[14];
        out[15] = a[15];
    }

    // Perform axis-specific matrix multiplication
    out[0] = a00 * c - a20 * s;
    out[1] = a01 * c - a21 * s;
    out[2] = a02 * c - a22 * s;
    out[3] = a03 * c - a23 * s;
    out[8] = a00 * s + a20 * c;
    out[9] = a01 * s + a21 * c;
    out[10] = a02 * s + a22 * c;
    out[11] = a03 * s + a23 * c;
    return out;
};

/**
 * Rotates a matrix by the given angle around the Z axis
 *
 * @param {mat4} out the receiving matrix
 * @param {mat4} a the matrix to rotate
 * @param {Number} rad the angle to rotate the matrix by
 * @returns {mat4} out
 */
mat4.rotateZ = function (out, a, rad) {
    var s = Math.sin(rad),
        c = Math.cos(rad),
        a00 = a[0],
        a01 = a[1],
        a02 = a[2],
        a03 = a[3],
        a10 = a[4],
        a11 = a[5],
        a12 = a[6],
        a13 = a[7];

    if (a !== out) { // If the source and destination differ, copy the unchanged last row
        out[8]  = a[8];
        out[9]  = a[9];
        out[10] = a[10];
        out[11] = a[11];
        out[12] = a[12];
        out[13] = a[13];
        out[14] = a[14];
        out[15] = a[15];
    }

    // Perform axis-specific matrix multiplication
    out[0] = a00 * c + a10 * s;
    out[1] = a01 * c + a11 * s;
    out[2] = a02 * c + a12 * s;
    out[3] = a03 * c + a13 * s;
    out[4] = a10 * c - a00 * s;
    out[5] = a11 * c - a01 * s;
    out[6] = a12 * c - a02 * s;
    out[7] = a13 * c - a03 * s;
    return out;
};

/**
 * Creates a matrix from a quaternion rotation and vector translation
 * This is equivalent to (but much faster than):
 *
 *     mat4.identity(dest);
 *     mat4.translate(dest, vec);
 *     var quatMat = mat4.create();
 *     quat4.toMat4(quat, quatMat);
 *     mat4.multiply(dest, quatMat);
 *
 * @param {mat4} out mat4 receiving operation result
 * @param {quat4} q Rotation quaternion
 * @param {vec3} v Translation vector
 * @returns {mat4} out
 */
mat4.fromRotationTranslation = function (out, q, v) {
    // Quaternion math
    var x = q[0], y = q[1], z = q[2], w = q[3],
        x2 = x + x,
        y2 = y + y,
        z2 = z + z,

        xx = x * x2,
        xy = x * y2,
        xz = x * z2,
        yy = y * y2,
        yz = y * z2,
        zz = z * z2,
        wx = w * x2,
        wy = w * y2,
        wz = w * z2;

    out[0] = 1 - (yy + zz);
    out[1] = xy + wz;
    out[2] = xz - wy;
    out[3] = 0;
    out[4] = xy - wz;
    out[5] = 1 - (xx + zz);
    out[6] = yz + wx;
    out[7] = 0;
    out[8] = xz + wy;
    out[9] = yz - wx;
    out[10] = 1 - (xx + yy);
    out[11] = 0;
    out[12] = v[0];
    out[13] = v[1];
    out[14] = v[2];
    out[15] = 1;
    
    return out;
};

/**
 * Generates a frustum matrix with the given bounds
 *
 * @param {mat4} out mat4 frustum matrix will be written into
 * @param {Number} left Left bound of the frustum
 * @param {Number} right Right bound of the frustum
 * @param {Number} bottom Bottom bound of the frustum
 * @param {Number} top Top bound of the frustum
 * @param {Number} near Near bound of the frustum
 * @param {Number} far Far bound of the frustum
 * @returns {mat4} out
 */
mat4.frustum = function (out, left, right, bottom, top, near, far) {
    var rl = 1 / (right - left),
        tb = 1 / (top - bottom),
        nf = 1 / (near - far);
    out[0] = (near * 2) * rl;
    out[1] = 0;
    out[2] = 0;
    out[3] = 0;
    out[4] = 0;
    out[5] = (near * 2) * tb;
    out[6] = 0;
    out[7] = 0;
    out[8] = (right + left) * rl;
    out[9] = (top + bottom) * tb;
    out[10] = (far + near) * nf;
    out[11] = -1;
    out[12] = 0;
    out[13] = 0;
    out[14] = (far * near * 2) * nf;
    out[15] = 0;
    return out;
};

/**
 * Generates a perspective projection matrix with the given bounds
 *
 * @param {mat4} out mat4 frustum matrix will be written into
 * @param {number} fovy Vertical field of view in radians
 * @param {number} aspect Aspect ratio. typically viewport width/height
 * @param {number} near Near bound of the frustum
 * @param {number} far Far bound of the frustum
 * @returns {mat4} out
 */
mat4.perspective = function (out, fovy, aspect, near, far) {
    var f = 1.0 / Math.tan(fovy / 2),
        nf = 1 / (near - far);
    out[0] = f / aspect;
    out[1] = 0;
    out[2] = 0;
    out[3] = 0;
    out[4] = 0;
    out[5] = f;
    out[6] = 0;
    out[7] = 0;
    out[8] = 0;
    out[9] = 0;
    out[10] = (far + near) * nf;
    out[11] = -1;
    out[12] = 0;
    out[13] = 0;
    out[14] = (2 * far * near) * nf;
    out[15] = 0;
    return out;
};

/**
 * Generates a orthogonal projection matrix with the given bounds
 *
 * @param {mat4} out mat4 frustum matrix will be written into
 * @param {number} left Left bound of the frustum
 * @param {number} right Right bound of the frustum
 * @param {number} bottom Bottom bound of the frustum
 * @param {number} top Top bound of the frustum
 * @param {number} near Near bound of the frustum
 * @param {number} far Far bound of the frustum
 * @returns {mat4} out
 */
mat4.ortho = function (out, left, right, bottom, top, near, far) {
    var lr = 1 / (left - right),
        bt = 1 / (bottom - top),
        nf = 1 / (near - far);
    out[0] = -2 * lr;
    out[1] = 0;
    out[2] = 0;
    out[3] = 0;
    out[4] = 0;
    out[5] = -2 * bt;
    out[6] = 0;
    out[7] = 0;
    out[8] = 0;
    out[9] = 0;
    out[10] = 2 * nf;
    out[11] = 0;
    out[12] = (left + right) * lr;
    out[13] = (top + bottom) * bt;
    out[14] = (far + near) * nf;
    out[15] = 1;
    return out;
};

/**
 * Generates a look-at matrix with the given eye position, focal point, and up axis
 *
 * @param {mat4} out mat4 frustum matrix will be written into
 * @param {vec3} eye Position of the viewer
 * @param {vec3} center Point the viewer is looking at
 * @param {vec3} up vec3 pointing up
 * @returns {mat4} out
 */
mat4.lookAt = function (out, eye, center, up) {
    var x0, x1, x2, y0, y1, y2, z0, z1, z2, len,
        eyex = eye[0],
        eyey = eye[1],
        eyez = eye[2],
        upx = up[0],
        upy = up[1],
        upz = up[2],
        centerx = center[0],
        centery = center[1],
        centerz = center[2];

    if (Math.abs(eyex - centerx) < GLMAT_EPSILON &&
        Math.abs(eyey - centery) < GLMAT_EPSILON &&
        Math.abs(eyez - centerz) < GLMAT_EPSILON) {
        return mat4.identity(out);
    }

    z0 = eyex - centerx;
    z1 = eyey - centery;
    z2 = eyez - centerz;

    len = 1 / Math.sqrt(z0 * z0 + z1 * z1 + z2 * z2);
    z0 *= len;
    z1 *= len;
    z2 *= len;

    x0 = upy * z2 - upz * z1;
    x1 = upz * z0 - upx * z2;
    x2 = upx * z1 - upy * z0;
    len = Math.sqrt(x0 * x0 + x1 * x1 + x2 * x2);
    if (!len) {
        x0 = 0;
        x1 = 0;
        x2 = 0;
    } else {
        len = 1 / len;
        x0 *= len;
        x1 *= len;
        x2 *= len;
    }

    y0 = z1 * x2 - z2 * x1;
    y1 = z2 * x0 - z0 * x2;
    y2 = z0 * x1 - z1 * x0;

    len = Math.sqrt(y0 * y0 + y1 * y1 + y2 * y2);
    if (!len) {
        y0 = 0;
        y1 = 0;
        y2 = 0;
    } else {
        len = 1 / len;
        y0 *= len;
        y1 *= len;
        y2 *= len;
    }

    out[0] = x0;
    out[1] = y0;
    out[2] = z0;
    out[3] = 0;
    out[4] = x1;
    out[5] = y1;
    out[6] = z1;
    out[7] = 0;
    out[8] = x2;
    out[9] = y2;
    out[10] = z2;
    out[11] = 0;
    out[12] = -(x0 * eyex + x1 * eyey + x2 * eyez);
    out[13] = -(y0 * eyex + y1 * eyey + y2 * eyez);
    out[14] = -(z0 * eyex + z1 * eyey + z2 * eyez);
    out[15] = 1;

    return out;
};

/**
 * Returns a string representation of a mat4
 *
 * @param {mat4} mat matrix to represent as a string
 * @returns {String} string representation of the matrix
 */
mat4.str = function (a) {
    return 'mat4(' + a[0] + ', ' + a[1] + ', ' + a[2] + ', ' + a[3] + ', ' +
                    a[4] + ', ' + a[5] + ', ' + a[6] + ', ' + a[7] + ', ' +
                    a[8] + ', ' + a[9] + ', ' + a[10] + ', ' + a[11] + ', ' + 
                    a[12] + ', ' + a[13] + ', ' + a[14] + ', ' + a[15] + ')';
};

if(typeof(exports) !== 'undefined') {
    exports.mat4 = mat4;
}
;
/* Copyright (c) 2012, Brandon Jones, Colin MacKenzie IV. All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice, this
    list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation 
    and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

/**
 * @class Quaternion
 * @name quat
 */

var quat = {};

var quatIdentity = new Float32Array([0, 0, 0, 1]);

if(!GLMAT_EPSILON) {
    var GLMAT_EPSILON = 0.000001;
}

/**
 * Creates a new identity quat
 *
 * @returns {quat} a new quaternion
 */
quat.create = function() {
    return new Float32Array(quatIdentity);
};

/**
 * Creates a new quat initialized with values from an existing quaternion
 *
 * @param {quat} a quaternion to clone
 * @returns {quat} a new quaternion
 */
quat.clone = vec4.clone;

/**
 * Creates a new quat initialized with the given values
 *
 * @param {Number} x X component
 * @param {Number} y Y component
 * @param {Number} z Z component
 * @param {Number} w W component
 * @returns {quat} a new quaternion
 */
quat.fromValues = vec4.fromValues;

/**
 * Copy the values from one quat to another
 *
 * @param {quat} out the receiving quaternion
 * @param {quat} a the source quaternion
 * @returns {quat} out
 */
quat.copy = vec4.copy;

/**
 * Set the components of a quat to the given values
 *
 * @param {quat} out the receiving quaternion
 * @param {Number} x X component
 * @param {Number} y Y component
 * @param {Number} z Z component
 * @param {Number} w W component
 * @returns {quat} out
 */
quat.set = vec4.set;

/**
 * Set a quat to the identity quaternion
 *
 * @param {quat} out the receiving quaternion
 * @returns {quat} out
 */
quat.identity = function(out) {
    out[0] = 0;
    out[1] = 0;
    out[2] = 0;
    out[3] = 1;
    return out;
};

/**
 * Sets a quat from the given angle and rotation axis,
 * then returns it.
 *
 * @param {quat} out the receiving quaternion
 * @param {vec3} axis the axis around which to rotate
 * @param {Number} rad the angle in radians
 * @returns {quat} out
 **/
quat.setAxisAngle = function(out, axis, rad) {
    rad = rad * 0.5;
    var s = Math.sin(rad);
    out[0] = s * axis[0];
    out[1] = s * axis[1];
    out[2] = s * axis[2];
    out[3] = Math.cos(rad);
    return out;
};

/**
 * Adds two quat's
 *
 * @param {quat} out the receiving quaternion
 * @param {quat} a the first operand
 * @param {quat} b the second operand
 * @returns {quat} out
 */
quat.add = vec4.add;

/**
 * Multiplies two quat's
 *
 * @param {quat} out the receiving quaternion
 * @param {quat} a the first operand
 * @param {quat} b the second operand
 * @returns {quat} out
 */
quat.mul = quat.multiply = function(out, a, b) {
    var ax = a[0], ay = a[1], az = a[2], aw = a[3],
        bx = b[0], by = b[1], bz = b[2], bw = b[3];

    out[0] = ax * bw + aw * bx + ay * bz - az * by;
    out[1] = ay * bw + aw * by + az * bx - ax * bz;
    out[2] = az * bw + aw * bz + ax * by - ay * bx;
    out[3] = aw * bw - ax * bx - ay * by - az * bz;
    return out;
};

/**
 * Scales a quat by a scalar number
 *
 * @param {quat} out the receiving vector
 * @param {quat} a the vector to scale
 * @param {quat} b amount to scale the vector by
 * @returns {quat} out
 */
quat.scale = vec4.scale;

/**
 * Rotates a quaternion by the given angle around the X axis
 *
 * @param {quat} out quat receiving operation result
 * @param {quat} a quat to rotate
 * @param {number} rad angle (in radians) to rotate
 * @returns {quat} out
 */
quat.rotateX = function (out, a, rad) {
    rad *= 0.5; 

    var ax = a[0], ay = a[1], az = a[2], aw = a[3],
        bx = Math.sin(rad), bw = Math.cos(rad);

    out[0] = ax * bw + aw * bx;
    out[1] = ay * bw + az * bx;
    out[2] = az * bw - ay * bx;
    out[3] = aw * bw - ax * bx;
    return out;
};

/**
 * Rotates a quaternion by the given angle around the X axis
 *
 * @param {quat} out quat receiving operation result
 * @param {quat} a quat to rotate
 * @param {number} rad angle (in radians) to rotate
 * @returns {quat} out
 */
quat.rotateY = function (out, a, rad) {
    rad *= 0.5; 

    var ax = a[0], ay = a[1], az = a[2], aw = a[3],
        by = Math.sin(rad), bw = Math.cos(rad);

    out[0] = ax * bw - az * by;
    out[1] = ay * bw + aw * by;
    out[2] = az * bw + ax * by;
    out[3] = aw * bw - ay * by;
    return out;
};

/**
 * Rotates a quaternion by the given angle around the X axis
 *
 * @param {quat} out quat receiving operation result
 * @param {quat} a quat to rotate
 * @param {number} rad angle (in radians) to rotate
 * @returns {quat} out
 */
quat.rotateZ = function (out, a, rad) {
    rad *= 0.5; 

    var ax = a[0], ay = a[1], az = a[2], aw = a[3],
        bz = Math.sin(rad), bw = Math.cos(rad);

    out[0] = ax * bw + ay * bz;
    out[1] = ay * bw - ax * bz;
    out[2] = az * bw + aw * bz;
    out[3] = aw * bw - az * bz;
    return out;
};

/**
 * Calculates the W component of a quat from the X, Y, and Z components.
 * Assumes that quaternion is 1 unit in length.
 * Any existing W component will be ignored.
 *
 * @param {quat} out the receiving quaternion
 * @param {quat} a quat to calculate W component of
 * @returns {quat} out
 */
quat.calculateW = function (out, a) {
    var x = a[0], y = a[1], z = a[2];

    out[0] = x;
    out[1] = y;
    out[2] = z;
    out[3] = -Math.sqrt(Math.abs(1.0 - x * x - y * y - z * z));
    return out;
};

/**
 * Caclulates the dot product of two quat's
 *
 * @param {quat} a the first operand
 * @param {quat} b the second operand
 * @returns {Number} dot product of a and b
 */
quat.dot = vec4.dot;

/**
 * Performs a linear interpolation between two quat's
 *
 * @param {quat} out the receiving quaternion
 * @param {quat} a the first operand
 * @param {quat} b the second operand
 * @param {Number} t interpolation amount between the two inputs
 * @returns {quat} out
 */
quat.lerp = vec4.lerp;

/**
 * Performs a spherical linear interpolation between two quat
 *
 * @param {quat} out the receiving quaternion
 * @param {quat} a the first operand
 * @param {quat} b the second operand
 * @param {Number} t interpolation amount between the two inputs
 * @returns {quat} out
 */
quat.slerp = function (out, a, b, t) {
    var ax = a[0], ay = a[1], az = a[2], aw = a[3],
        bx = b[0], by = b[1], bz = b[2], bw = a[3];

    var cosHalfTheta = ax * bx + ay * by + az * bz + aw * bw,
        halfTheta,
        sinHalfTheta,
        ratioA,
        ratioB;

    if (Math.abs(cosHalfTheta) >= 1.0) {
        if (out !== a) {
            out[0] = ax;
            out[1] = ay;
            out[2] = az;
            out[3] = aw;
        }
        return out;
    }

    halfTheta = Math.acos(cosHalfTheta);
    sinHalfTheta = Math.sqrt(1.0 - cosHalfTheta * cosHalfTheta);

    if (Math.abs(sinHalfTheta) < 0.001) {
        out[0] = (ax * 0.5 + bx * 0.5);
        out[1] = (ay * 0.5 + by * 0.5);
        out[2] = (az * 0.5 + bz * 0.5);
        out[3] = (aw * 0.5 + bw * 0.5);
        return out;
    }

    ratioA = Math.sin((1 - t) * halfTheta) / sinHalfTheta;
    ratioB = Math.sin(t * halfTheta) / sinHalfTheta;

    out[0] = (ax * ratioA + bx * ratioB);
    out[1] = (ay * ratioA + by * ratioB);
    out[2] = (az * ratioA + bz * ratioB);
    out[3] = (aw * ratioA + bw * ratioB);

    return out;
};

/**
 * Calculates the inverse of a quat
 *
 * @param {quat} out the receiving quaternion
 * @param {quat} a quat to calculate inverse of
 * @returns {quat} out
 */
quat.invert = function(out, a) {
    var a0 = a[0], a1 = a[1], a2 = a[2], a3 = a[3],
        dot = a0*a0 + a1*a1 + a2*a2 + a3*a3,
        invDot = dot ? 1.0/dot : 0;
    
    // TODO: Would be faster to return [0,0,0,0] immediately if dot == 0

    out[0] = -a0*invDot;
    out[1] = -a1*invDot;
    out[2] = -a2*invDot;
    out[3] = a3*invDot;
    return out;
};

/**
 * Calculates the conjugate of a quat
 * If the quaternion is normalized, this function is faster than quat.inverse and produces the same result.
 *
 * @param {quat} out the receiving quaternion
 * @param {quat} a quat to calculate conjugate of
 * @returns {quat} out
 */
quat.conjugate = function (out, a) {
    out[0] = -a[0];
    out[1] = -a[1];
    out[2] = -a[2];
    out[3] = a[3];
    return out;
};

/**
 * Caclulates the length of a quat
 *
 * @param {quat} a vector to calculate length of
 * @returns {Number} length of a
 */
quat.len = quat.length = vec4.length;

/**
 * Caclulates the squared length of a quat
 *
 * @param {quat} a vector to calculate squared length of
 * @returns {Number} squared length of a
 */
quat.sqrLen = quat.squaredLength = vec4.squaredLength;

/**
 * Normalize a quat
 *
 * @param {quat} out the receiving quaternion
 * @param {quat} a quaternion to normalize
 * @returns {quat} out
 */
quat.normalize = vec4.normalize;

/**
 * Returns a string representation of a quatenion
 *
 * @param {quat} vec vector to represent as a string
 * @returns {String} string representation of the vector
 */
quat.str = function (a) {
    return 'quat(' + a[0] + ', ' + a[1] + ', ' + a[2] + ', ' + a[3] + ')';
};

if(typeof(exports) !== 'undefined') {
    exports.quat = quat;
}
;










  })(shim.exports);
})();

},{}],6:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

function EventEmitter() {
  this._events = this._events || {};
  this._maxListeners = this._maxListeners || undefined;
}
module.exports = EventEmitter;

// Backwards-compat with node 0.10.x
EventEmitter.EventEmitter = EventEmitter;

EventEmitter.prototype._events = undefined;
EventEmitter.prototype._maxListeners = undefined;

// By default EventEmitters will print a warning if more than 10 listeners are
// added to it. This is a useful default which helps finding memory leaks.
EventEmitter.defaultMaxListeners = 10;

// Obviously not all Emitters should be limited to 10. This function allows
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function(n) {
  if (!isNumber(n) || n < 0 || isNaN(n))
    throw TypeError('n must be a positive number');
  this._maxListeners = n;
  return this;
};

EventEmitter.prototype.emit = function(type) {
  var er, handler, len, args, i, listeners;

  if (!this._events)
    this._events = {};

  // If there is no 'error' event listener then throw.
  if (type === 'error') {
    if (!this._events.error ||
        (isObject(this._events.error) && !this._events.error.length)) {
      er = arguments[1];
      if (er instanceof Error) {
        throw er; // Unhandled 'error' event
      } else {
        throw TypeError('Uncaught, unspecified "error" event.');
      }
      return false;
    }
  }

  handler = this._events[type];

  if (isUndefined(handler))
    return false;

  if (isFunction(handler)) {
    switch (arguments.length) {
      // fast cases
      case 1:
        handler.call(this);
        break;
      case 2:
        handler.call(this, arguments[1]);
        break;
      case 3:
        handler.call(this, arguments[1], arguments[2]);
        break;
      // slower
      default:
        len = arguments.length;
        args = new Array(len - 1);
        for (i = 1; i < len; i++)
          args[i - 1] = arguments[i];
        handler.apply(this, args);
    }
  } else if (isObject(handler)) {
    len = arguments.length;
    args = new Array(len - 1);
    for (i = 1; i < len; i++)
      args[i - 1] = arguments[i];

    listeners = handler.slice();
    len = listeners.length;
    for (i = 0; i < len; i++)
      listeners[i].apply(this, args);
  }

  return true;
};

EventEmitter.prototype.addListener = function(type, listener) {
  var m;

  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  if (!this._events)
    this._events = {};

  // To avoid recursion in the case that type === "newListener"! Before
  // adding it to the listeners, first emit "newListener".
  if (this._events.newListener)
    this.emit('newListener', type,
              isFunction(listener.listener) ?
              listener.listener : listener);

  if (!this._events[type])
    // Optimize the case of one listener. Don't need the extra array object.
    this._events[type] = listener;
  else if (isObject(this._events[type]))
    // If we've already got an array, just append.
    this._events[type].push(listener);
  else
    // Adding the second element, need to change to array.
    this._events[type] = [this._events[type], listener];

  // Check for listener leak
  if (isObject(this._events[type]) && !this._events[type].warned) {
    var m;
    if (!isUndefined(this._maxListeners)) {
      m = this._maxListeners;
    } else {
      m = EventEmitter.defaultMaxListeners;
    }

    if (m && m > 0 && this._events[type].length > m) {
      this._events[type].warned = true;
      console.error('(node) warning: possible EventEmitter memory ' +
                    'leak detected. %d listeners added. ' +
                    'Use emitter.setMaxListeners() to increase limit.',
                    this._events[type].length);
      console.trace();
    }
  }

  return this;
};

EventEmitter.prototype.on = EventEmitter.prototype.addListener;

EventEmitter.prototype.once = function(type, listener) {
  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  var fired = false;

  function g() {
    this.removeListener(type, g);

    if (!fired) {
      fired = true;
      listener.apply(this, arguments);
    }
  }

  g.listener = listener;
  this.on(type, g);

  return this;
};

// emits a 'removeListener' event iff the listener was removed
EventEmitter.prototype.removeListener = function(type, listener) {
  var list, position, length, i;

  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  if (!this._events || !this._events[type])
    return this;

  list = this._events[type];
  length = list.length;
  position = -1;

  if (list === listener ||
      (isFunction(list.listener) && list.listener === listener)) {
    delete this._events[type];
    if (this._events.removeListener)
      this.emit('removeListener', type, listener);

  } else if (isObject(list)) {
    for (i = length; i-- > 0;) {
      if (list[i] === listener ||
          (list[i].listener && list[i].listener === listener)) {
        position = i;
        break;
      }
    }

    if (position < 0)
      return this;

    if (list.length === 1) {
      list.length = 0;
      delete this._events[type];
    } else {
      list.splice(position, 1);
    }

    if (this._events.removeListener)
      this.emit('removeListener', type, listener);
  }

  return this;
};

EventEmitter.prototype.removeAllListeners = function(type) {
  var key, listeners;

  if (!this._events)
    return this;

  // not listening for removeListener, no need to emit
  if (!this._events.removeListener) {
    if (arguments.length === 0)
      this._events = {};
    else if (this._events[type])
      delete this._events[type];
    return this;
  }

  // emit removeListener for all listeners on all events
  if (arguments.length === 0) {
    for (key in this._events) {
      if (key === 'removeListener') continue;
      this.removeAllListeners(key);
    }
    this.removeAllListeners('removeListener');
    this._events = {};
    return this;
  }

  listeners = this._events[type];

  if (isFunction(listeners)) {
    this.removeListener(type, listeners);
  } else {
    // LIFO order
    while (listeners.length)
      this.removeListener(type, listeners[listeners.length - 1]);
  }
  delete this._events[type];

  return this;
};

EventEmitter.prototype.listeners = function(type) {
  var ret;
  if (!this._events || !this._events[type])
    ret = [];
  else if (isFunction(this._events[type]))
    ret = [this._events[type]];
  else
    ret = this._events[type].slice();
  return ret;
};

EventEmitter.listenerCount = function(emitter, type) {
  var ret;
  if (!emitter._events || !emitter._events[type])
    ret = 0;
  else if (isFunction(emitter._events[type]))
    ret = 1;
  else
    ret = emitter._events[type].length;
  return ret;
};

function isFunction(arg) {
  return typeof arg === 'function';
}

function isNumber(arg) {
  return typeof arg === 'number';
}

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}

function isUndefined(arg) {
  return arg === void 0;
}

},{}],7:[function(require,module,exports){
 // ----------------------------------------------------------------------------
 // Buzz, a Javascript HTML5 Audio library
 // v1.1.0 - released 2013-08-15 13:18
 // Licensed under the MIT license.
 // http://buzz.jaysalvat.com/
 // ----------------------------------------------------------------------------
 // Copyright (C) 2010-2013 Jay Salvat
 // http://jaysalvat.com/
 // ----------------------------------------------------------------------------

(function(name, context, factory) {
    if (typeof module !== "undefined" && module.exports) {
        module.exports = factory();
    } else if (typeof context.define === "function" && context.define.amd) {
        define(name, [], factory);
    } else {
        context[name] = factory();
    }
})("buzz", this, function() {
    var buzz = {
        defaults: {
            autoplay: false,
            duration: 5e3,
            formats: [],
            loop: false,
            placeholder: "--",
            preload: "metadata",
            volume: 80,
            document: document
        },
        types: {
            mp3: "audio/mpeg",
            ogg: "audio/ogg",
            wav: "audio/wav",
            aac: "audio/aac",
            m4a: "audio/x-m4a"
        },
        sounds: [],
        el: document.createElement("audio"),
        sound: function(src, options) {
            options = options || {};
            var doc = options.document || buzz.defaults.document;
            var pid = 0, events = [], eventsOnce = {}, supported = buzz.isSupported();
            this.load = function() {
                if (!supported) {
                    return this;
                }
                this.sound.load();
                return this;
            };
            this.play = function() {
                if (!supported) {
                    return this;
                }
                this.sound.play();
                return this;
            };
            this.togglePlay = function() {
                if (!supported) {
                    return this;
                }
                if (this.sound.paused) {
                    this.sound.play();
                } else {
                    this.sound.pause();
                }
                return this;
            };
            this.pause = function() {
                if (!supported) {
                    return this;
                }
                this.sound.pause();
                return this;
            };
            this.isPaused = function() {
                if (!supported) {
                    return null;
                }
                return this.sound.paused;
            };
            this.stop = function() {
                if (!supported) {
                    return this;
                }
                this.setTime(0);
                this.sound.pause();
                return this;
            };
            this.isEnded = function() {
                if (!supported) {
                    return null;
                }
                return this.sound.ended;
            };
            this.loop = function() {
                if (!supported) {
                    return this;
                }
                this.sound.loop = "loop";
                this.bind("ended.buzzloop", function() {
                    this.currentTime = 0;
                    this.play();
                });
                return this;
            };
            this.unloop = function() {
                if (!supported) {
                    return this;
                }
                this.sound.removeAttribute("loop");
                this.unbind("ended.buzzloop");
                return this;
            };
            this.mute = function() {
                if (!supported) {
                    return this;
                }
                this.sound.muted = true;
                return this;
            };
            this.unmute = function() {
                if (!supported) {
                    return this;
                }
                this.sound.muted = false;
                return this;
            };
            this.toggleMute = function() {
                if (!supported) {
                    return this;
                }
                this.sound.muted = !this.sound.muted;
                return this;
            };
            this.isMuted = function() {
                if (!supported) {
                    return null;
                }
                return this.sound.muted;
            };
            this.setVolume = function(volume) {
                if (!supported) {
                    return this;
                }
                if (volume < 0) {
                    volume = 0;
                }
                if (volume > 100) {
                    volume = 100;
                }
                this.volume = volume;
                this.sound.volume = volume / 100;
                return this;
            };
            this.getVolume = function() {
                if (!supported) {
                    return this;
                }
                return this.volume;
            };
            this.increaseVolume = function(value) {
                return this.setVolume(this.volume + (value || 1));
            };
            this.decreaseVolume = function(value) {
                return this.setVolume(this.volume - (value || 1));
            };
            this.setTime = function(time) {
                if (!supported) {
                    return this;
                }
                var set = true;
                this.whenReady(function() {
                    if (set === true) {
                        set = false;
                        this.sound.currentTime = time;
                    }
                });
                return this;
            };
            this.getTime = function() {
                if (!supported) {
                    return null;
                }
                var time = Math.round(this.sound.currentTime * 100) / 100;
                return isNaN(time) ? buzz.defaults.placeholder : time;
            };
            this.setPercent = function(percent) {
                if (!supported) {
                    return this;
                }
                return this.setTime(buzz.fromPercent(percent, this.sound.duration));
            };
            this.getPercent = function() {
                if (!supported) {
                    return null;
                }
                var percent = Math.round(buzz.toPercent(this.sound.currentTime, this.sound.duration));
                return isNaN(percent) ? buzz.defaults.placeholder : percent;
            };
            this.setSpeed = function(duration) {
                if (!supported) {
                    return this;
                }
                this.sound.playbackRate = duration;
                return this;
            };
            this.getSpeed = function() {
                if (!supported) {
                    return null;
                }
                return this.sound.playbackRate;
            };
            this.getDuration = function() {
                if (!supported) {
                    return null;
                }
                var duration = Math.round(this.sound.duration * 100) / 100;
                return isNaN(duration) ? buzz.defaults.placeholder : duration;
            };
            this.getPlayed = function() {
                if (!supported) {
                    return null;
                }
                return timerangeToArray(this.sound.played);
            };
            this.getBuffered = function() {
                if (!supported) {
                    return null;
                }
                return timerangeToArray(this.sound.buffered);
            };
            this.getSeekable = function() {
                if (!supported) {
                    return null;
                }
                return timerangeToArray(this.sound.seekable);
            };
            this.getErrorCode = function() {
                if (supported && this.sound.error) {
                    return this.sound.error.code;
                }
                return 0;
            };
            this.getErrorMessage = function() {
                if (!supported) {
                    return null;
                }
                switch (this.getErrorCode()) {
                  case 1:
                    return "MEDIA_ERR_ABORTED";

                  case 2:
                    return "MEDIA_ERR_NETWORK";

                  case 3:
                    return "MEDIA_ERR_DECODE";

                  case 4:
                    return "MEDIA_ERR_SRC_NOT_SUPPORTED";

                  default:
                    return null;
                }
            };
            this.getStateCode = function() {
                if (!supported) {
                    return null;
                }
                return this.sound.readyState;
            };
            this.getStateMessage = function() {
                if (!supported) {
                    return null;
                }
                switch (this.getStateCode()) {
                  case 0:
                    return "HAVE_NOTHING";

                  case 1:
                    return "HAVE_METADATA";

                  case 2:
                    return "HAVE_CURRENT_DATA";

                  case 3:
                    return "HAVE_FUTURE_DATA";

                  case 4:
                    return "HAVE_ENOUGH_DATA";

                  default:
                    return null;
                }
            };
            this.getNetworkStateCode = function() {
                if (!supported) {
                    return null;
                }
                return this.sound.networkState;
            };
            this.getNetworkStateMessage = function() {
                if (!supported) {
                    return null;
                }
                switch (this.getNetworkStateCode()) {
                  case 0:
                    return "NETWORK_EMPTY";

                  case 1:
                    return "NETWORK_IDLE";

                  case 2:
                    return "NETWORK_LOADING";

                  case 3:
                    return "NETWORK_NO_SOURCE";

                  default:
                    return null;
                }
            };
            this.set = function(key, value) {
                if (!supported) {
                    return this;
                }
                this.sound[key] = value;
                return this;
            };
            this.get = function(key) {
                if (!supported) {
                    return null;
                }
                return key ? this.sound[key] : this.sound;
            };
            this.bind = function(types, func) {
                if (!supported) {
                    return this;
                }
                types = types.split(" ");
                var self = this, efunc = function(e) {
                    func.call(self, e);
                };
                for (var t = 0; t < types.length; t++) {
                    var type = types[t], idx = type;
                    type = idx.split(".")[0];
                    events.push({
                        idx: idx,
                        func: efunc
                    });
                    this.sound.addEventListener(type, efunc, true);
                }
                return this;
            };
            this.unbind = function(types) {
                if (!supported) {
                    return this;
                }
                types = types.split(" ");
                for (var t = 0; t < types.length; t++) {
                    var idx = types[t], type = idx.split(".")[0];
                    for (var i = 0; i < events.length; i++) {
                        var namespace = events[i].idx.split(".");
                        if (events[i].idx == idx || namespace[1] && namespace[1] == idx.replace(".", "")) {
                            this.sound.removeEventListener(type, events[i].func, true);
                            events.splice(i, 1);
                        }
                    }
                }
                return this;
            };
            this.bindOnce = function(type, func) {
                if (!supported) {
                    return this;
                }
                var self = this;
                eventsOnce[pid++] = false;
                this.bind(type + "." + pid, function() {
                    if (!eventsOnce[pid]) {
                        eventsOnce[pid] = true;
                        func.call(self);
                    }
                    self.unbind(type + "." + pid);
                });
                return this;
            };
            this.trigger = function(types) {
                if (!supported) {
                    return this;
                }
                types = types.split(" ");
                for (var t = 0; t < types.length; t++) {
                    var idx = types[t];
                    for (var i = 0; i < events.length; i++) {
                        var eventType = events[i].idx.split(".");
                        if (events[i].idx == idx || eventType[0] && eventType[0] == idx.replace(".", "")) {
                            var evt = doc.createEvent("HTMLEvents");
                            evt.initEvent(eventType[0], false, true);
                            this.sound.dispatchEvent(evt);
                        }
                    }
                }
                return this;
            };
            this.fadeTo = function(to, duration, callback) {
                if (!supported) {
                    return this;
                }
                if (duration instanceof Function) {
                    callback = duration;
                    duration = buzz.defaults.duration;
                } else {
                    duration = duration || buzz.defaults.duration;
                }
                var from = this.volume, delay = duration / Math.abs(from - to), self = this;
                this.play();
                function doFade() {
                    setTimeout(function() {
                        if (from < to && self.volume < to) {
                            self.setVolume(self.volume += 1);
                            doFade();
                        } else if (from > to && self.volume > to) {
                            self.setVolume(self.volume -= 1);
                            doFade();
                        } else if (callback instanceof Function) {
                            callback.apply(self);
                        }
                    }, delay);
                }
                this.whenReady(function() {
                    doFade();
                });
                return this;
            };
            this.fadeIn = function(duration, callback) {
                if (!supported) {
                    return this;
                }
                return this.setVolume(0).fadeTo(100, duration, callback);
            };
            this.fadeOut = function(duration, callback) {
                if (!supported) {
                    return this;
                }
                return this.fadeTo(0, duration, callback);
            };
            this.fadeWith = function(sound, duration) {
                if (!supported) {
                    return this;
                }
                this.fadeOut(duration, function() {
                    this.stop();
                });
                sound.play().fadeIn(duration);
                return this;
            };
            this.whenReady = function(func) {
                if (!supported) {
                    return null;
                }
                var self = this;
                if (this.sound.readyState === 0) {
                    this.bind("canplay.buzzwhenready", function() {
                        func.call(self);
                    });
                } else {
                    func.call(self);
                }
            };
            function timerangeToArray(timeRange) {
                var array = [], length = timeRange.length - 1;
                for (var i = 0; i <= length; i++) {
                    array.push({
                        start: timeRange.start(i),
                        end: timeRange.end(i)
                    });
                }
                return array;
            }
            function getExt(filename) {
                return filename.split(".").pop();
            }
            function addSource(sound, src) {
                var source = doc.createElement("source");
                source.src = src;
                if (buzz.types[getExt(src)]) {
                    source.type = buzz.types[getExt(src)];
                }
                sound.appendChild(source);
            }
            if (supported && src) {
                for (var i in buzz.defaults) {
                    if (buzz.defaults.hasOwnProperty(i)) {
                        options[i] = options[i] || buzz.defaults[i];
                    }
                }
                this.sound = doc.createElement("audio");
                if (src instanceof Array) {
                    for (var j in src) {
                        if (src.hasOwnProperty(j)) {
                            addSource(this.sound, src[j]);
                        }
                    }
                } else if (options.formats.length) {
                    for (var k in options.formats) {
                        if (options.formats.hasOwnProperty(k)) {
                            addSource(this.sound, src + "." + options.formats[k]);
                        }
                    }
                } else {
                    addSource(this.sound, src);
                }
                if (options.loop) {
                    this.loop();
                }
                if (options.autoplay) {
                    this.sound.autoplay = "autoplay";
                }
                if (options.preload === true) {
                    this.sound.preload = "auto";
                } else if (options.preload === false) {
                    this.sound.preload = "none";
                } else {
                    this.sound.preload = options.preload;
                }
                this.setVolume(options.volume);
                buzz.sounds.push(this);
            }
        },
        group: function(sounds) {
            sounds = argsToArray(sounds, arguments);
            this.getSounds = function() {
                return sounds;
            };
            this.add = function(soundArray) {
                soundArray = argsToArray(soundArray, arguments);
                for (var a = 0; a < soundArray.length; a++) {
                    sounds.push(soundArray[a]);
                }
            };
            this.remove = function(soundArray) {
                soundArray = argsToArray(soundArray, arguments);
                for (var a = 0; a < soundArray.length; a++) {
                    for (var i = 0; i < sounds.length; i++) {
                        if (sounds[i] == soundArray[a]) {
                            sounds.splice(i, 1);
                            break;
                        }
                    }
                }
            };
            this.load = function() {
                fn("load");
                return this;
            };
            this.play = function() {
                fn("play");
                return this;
            };
            this.togglePlay = function() {
                fn("togglePlay");
                return this;
            };
            this.pause = function(time) {
                fn("pause", time);
                return this;
            };
            this.stop = function() {
                fn("stop");
                return this;
            };
            this.mute = function() {
                fn("mute");
                return this;
            };
            this.unmute = function() {
                fn("unmute");
                return this;
            };
            this.toggleMute = function() {
                fn("toggleMute");
                return this;
            };
            this.setVolume = function(volume) {
                fn("setVolume", volume);
                return this;
            };
            this.increaseVolume = function(value) {
                fn("increaseVolume", value);
                return this;
            };
            this.decreaseVolume = function(value) {
                fn("decreaseVolume", value);
                return this;
            };
            this.loop = function() {
                fn("loop");
                return this;
            };
            this.unloop = function() {
                fn("unloop");
                return this;
            };
            this.setTime = function(time) {
                fn("setTime", time);
                return this;
            };
            this.set = function(key, value) {
                fn("set", key, value);
                return this;
            };
            this.bind = function(type, func) {
                fn("bind", type, func);
                return this;
            };
            this.unbind = function(type) {
                fn("unbind", type);
                return this;
            };
            this.bindOnce = function(type, func) {
                fn("bindOnce", type, func);
                return this;
            };
            this.trigger = function(type) {
                fn("trigger", type);
                return this;
            };
            this.fade = function(from, to, duration, callback) {
                fn("fade", from, to, duration, callback);
                return this;
            };
            this.fadeIn = function(duration, callback) {
                fn("fadeIn", duration, callback);
                return this;
            };
            this.fadeOut = function(duration, callback) {
                fn("fadeOut", duration, callback);
                return this;
            };
            function fn() {
                var args = argsToArray(null, arguments), func = args.shift();
                for (var i = 0; i < sounds.length; i++) {
                    sounds[i][func].apply(sounds[i], args);
                }
            }
            function argsToArray(array, args) {
                return array instanceof Array ? array : Array.prototype.slice.call(args);
            }
        },
        all: function() {
            return new buzz.group(buzz.sounds);
        },
        isSupported: function() {
            return !!buzz.el.canPlayType;
        },
        isOGGSupported: function() {
            return !!buzz.el.canPlayType && buzz.el.canPlayType('audio/ogg; codecs="vorbis"');
        },
        isWAVSupported: function() {
            return !!buzz.el.canPlayType && buzz.el.canPlayType('audio/wav; codecs="1"');
        },
        isMP3Supported: function() {
            return !!buzz.el.canPlayType && buzz.el.canPlayType("audio/mpeg;");
        },
        isAACSupported: function() {
            return !!buzz.el.canPlayType && (buzz.el.canPlayType("audio/x-m4a;") || buzz.el.canPlayType("audio/aac;"));
        },
        toTimer: function(time, withHours) {
            var h, m, s;
            h = Math.floor(time / 3600);
            h = isNaN(h) ? "--" : h >= 10 ? h : "0" + h;
            m = withHours ? Math.floor(time / 60 % 60) : Math.floor(time / 60);
            m = isNaN(m) ? "--" : m >= 10 ? m : "0" + m;
            s = Math.floor(time % 60);
            s = isNaN(s) ? "--" : s >= 10 ? s : "0" + s;
            return withHours ? h + ":" + m + ":" + s : m + ":" + s;
        },
        fromTimer: function(time) {
            var splits = time.toString().split(":");
            if (splits && splits.length == 3) {
                time = parseInt(splits[0], 10) * 3600 + parseInt(splits[1], 10) * 60 + parseInt(splits[2], 10);
            }
            if (splits && splits.length == 2) {
                time = parseInt(splits[0], 10) * 60 + parseInt(splits[1], 10);
            }
            return time;
        },
        toPercent: function(value, total, decimal) {
            var r = Math.pow(10, decimal || 0);
            return Math.round(value * 100 / total * r) / r;
        },
        fromPercent: function(percent, total, decimal) {
            var r = Math.pow(10, decimal || 0);
            return Math.round(total / 100 * percent * r) / r;
        }
    };
    return buzz;
});
},{}],8:[function(require,module,exports){
var EventEmitter = require('events').EventEmitter;
var inherits = require('inherits');

module.exports = Entity;
inherits(Entity, EventEmitter);

function Entity(){}

Entity.prototype.addTo = function(game){
  this.game = game || {};

  if (!this.game.entities) this.game.entities = [];

  this.game.entities.push(this);
  this.game.findEntity = this.findEntity;
  this.initializeListeners();
  this.exists = true;

  return this;
};

Entity.prototype.initializeListeners = function(){
  var self = this;
  this.findEntity(this, function(exists, entities, index){
    if (exists){
      self.game.on('update', function(interval){
        self.emit('update', interval)
      });

      self.game.on('draw', function(context){
        self.emit('draw', context);
      });
    }
  });
};

Entity.prototype.remove = function(){
  this.removeAllListeners('update');
  this.removeAllListeners('draw');

  this.findEntity(this, function(exists, entities, index){
    if (exists) entities.splice(index, 1);
  });

  this.exists = false;
};

Entity.prototype.findEntity = function(entity, callback){
  var exists = false;
  var entities;
  if (this.game) entities = this.game.entities;
  else entities = this.entities
  var index;

  if (entities){
    for (var i=0; i<entities.length; i++){
      if (entities[i] === entity) {
        exists = true;
        index = i;
      }
    }
  }

  callback(exists, entities, index);
};

},{"events":6,"inherits":9}],9:[function(require,module,exports){
if (typeof Object.create === 'function') {
  // implementation from standard node.js 'util' module
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    ctor.prototype = Object.create(superCtor.prototype, {
      constructor: {
        value: ctor,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
  };
} else {
  // old school shim for old browsers
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    var TempCtor = function () {}
    TempCtor.prototype = superCtor.prototype
    ctor.prototype = new TempCtor()
    ctor.prototype.constructor = ctor
  }
}

},{}],10:[function(require,module,exports){
var EventEmitter = require('events').EventEmitter;
var requestAnimationFrame = require('raf');
var inherits = require('inherits');

module.exports = Game;
inherits(Game, EventEmitter);

function Game(options){
  var options = options || {};

  EventEmitter.call(this);
  var self = this;
  
  if (!options.canvas){
    this.canvas = document.createElement('canvas');
    this.canvas.id = 'game';
    document.body.appendChild(this.canvas);
  } else if (typeof options.canvas === 'string'){
    this.canvas = document.getElementById(options.canvas);
  } else if (typeof options.canvas === 'object' && options.canvas.tagName) {
    this.canvas = options.canvas
  }

  this.context = this.canvas.getContext('2d');
  this.width = this.canvas.width = options.width || window.innerWidth;
  this.height = this.canvas.height = options.height || window.innerHeight;

  this.ticker = requestAnimationFrame(this.canvas);
  this.paused = false;

  if (options.maxListeners) this.setMaxListeners(options.maxListeners);
  else this.setMaxListeners(0);

  //window.addEventListener('load', function(){
  //  self.start();
  //});
}

Game.prototype.start = function(){
  var self = this;
  this.emit('start');
  this.ticker.on('data', function(interval) {
    self.update(interval);
    self.draw();
  });
};

Game.prototype.pause = function(){
  this.paused = true;
  this.ticker.pause();
  this.emit('pause');
};

Game.prototype.resume = function(){
  var self = this;
  
  this.paused = false;
  this.ticker = requestAnimationFrame(this.canvas);
  this.ticker.on('data', function(interval) {
    self.update(interval);
    self.draw();
  });

  this.emit('resume');
};

Game.prototype.update = function(interval){
  this.emit('update', interval);
};

Game.prototype.draw = function(){
  this.context.clearRect(0, 0, this.width, this.height);
  this.emit('draw-background', this.context);
  this.emit('draw', this.context);
  this.emit('draw-foreground', this.context);
};
},{"events":6,"inherits":11,"raf":12}],11:[function(require,module,exports){
module.exports=require(9)
},{}],12:[function(require,module,exports){
module.exports = raf

var EE = require('events').EventEmitter
  , global = typeof window === 'undefined' ? this : window
  , now = global.performance && global.performance.now ? function() {
    return performance.now()
  } : Date.now || function () {
    return +new Date()
  }

var _raf =
  global.requestAnimationFrame ||
  global.webkitRequestAnimationFrame ||
  global.mozRequestAnimationFrame ||
  global.msRequestAnimationFrame ||
  global.oRequestAnimationFrame ||
  (global.setImmediate ? function(fn, el) {
    setImmediate(fn)
  } :
  function(fn, el) {
    setTimeout(fn, 0)
  })

function raf(el) {
  var now = raf.now()
    , ee = new EE

  ee.pause = function() { ee.paused = true }
  ee.resume = function() { ee.paused = false }

  _raf(iter, el)

  return ee

  function iter(timestamp) {
    var _now = raf.now()
      , dt = _now - now
    
    now = _now

    ee.emit('data', dt)

    if(!ee.paused) {
      _raf(iter, el)
    }
  }
}

raf.polyfill = _raf
raf.now = now


},{"events":6}],13:[function(require,module,exports){
var EventEmitter = require('events').EventEmitter;
var inherits = require('inherits');
var vkey = require('vkey');

module.exports = Keyboard;
inherits(Keyboard, EventEmitter);

function Keyboard(game){
  this.game = game || {};
  this.keysDown = {};
  this.initializeListeners();
}

Keyboard.prototype.initializeListeners = function(){
  var self = this;

  document.addEventListener('keydown', function(e){
    self.emit('keydown', vkey[e.keyCode]);
    self.keysDown[vkey[e.keyCode]] = true;

    if (e.keyCode === 40 || e.keyCode === 38 || e.keyCode === 37 || e.keyCode === 39 || e.keyCode === 32) {
      e.preventDefault();
    }
  }, false);

  document.addEventListener('keyup', function(e){
    self.emit('keyup', vkey[e.keyCode]);
    delete self.keysDown[vkey[e.keyCode]];
  }, false);
};
},{"events":6,"inherits":14,"vkey":15}],14:[function(require,module,exports){
module.exports=require(9)
},{}],15:[function(require,module,exports){
var ua = typeof window !== 'undefined' ? window.navigator.userAgent : ''
  , isOSX = /OS X/.test(ua)
  , isOpera = /Opera/.test(ua)
  , maybeFirefox = !/like Gecko/.test(ua) && !isOpera

var i, output = module.exports = {
  0:  isOSX ? '<menu>' : '<UNK>'
, 1:  '<mouse 1>'
, 2:  '<mouse 2>'
, 3:  '<break>'
, 4:  '<mouse 3>'
, 5:  '<mouse 4>'
, 6:  '<mouse 5>'
, 8:  '<backspace>'
, 9:  '<tab>'
, 12: '<clear>'
, 13: '<enter>'
, 16: '<shift>'
, 17: '<control>'
, 18: '<alt>'
, 19: '<pause>'
, 20: '<caps-lock>'
, 21: '<ime-hangul>'
, 23: '<ime-junja>'
, 24: '<ime-final>'
, 25: '<ime-kanji>'
, 27: '<escape>'
, 28: '<ime-convert>'
, 29: '<ime-nonconvert>'
, 30: '<ime-accept>'
, 31: '<ime-mode-change>'
, 27: '<escape>'
, 32: '<space>'
, 33: '<page-up>'
, 34: '<page-down>'
, 35: '<end>'
, 36: '<home>'
, 37: '<left>'
, 38: '<up>'
, 39: '<right>'
, 40: '<down>'
, 41: '<select>'
, 42: '<print>'
, 43: '<execute>'
, 44: '<snapshot>'
, 45: '<insert>'
, 46: '<delete>'
, 47: '<help>'
, 91: '<meta>'  // meta-left -- no one handles left and right properly, so we coerce into one.
, 92: '<meta>'  // meta-right
, 93: isOSX ? '<meta>' : '<menu>'      // chrome,opera,safari all report this for meta-right (osx mbp).
, 95: '<sleep>'
, 106: '<num-*>'
, 107: '<num-+>'
, 108: '<num-enter>'
, 109: '<num-->'
, 110: '<num-.>'
, 111: '<num-/>'
, 144: '<num-lock>'
, 145: '<scroll-lock>'
, 160: '<shift-left>'
, 161: '<shift-right>'
, 162: '<control-left>'
, 163: '<control-right>'
, 164: '<alt-left>'
, 165: '<alt-right>'
, 166: '<browser-back>'
, 167: '<browser-forward>'
, 168: '<browser-refresh>'
, 169: '<browser-stop>'
, 170: '<browser-search>'
, 171: '<browser-favorites>'
, 172: '<browser-home>'

  // ff/osx reports '<volume-mute>' for '-'
, 173: isOSX && maybeFirefox ? '-' : '<volume-mute>'
, 174: '<volume-down>'
, 175: '<volume-up>'
, 176: '<next-track>'
, 177: '<prev-track>'
, 178: '<stop>'
, 179: '<play-pause>'
, 180: '<launch-mail>'
, 181: '<launch-media-select>'
, 182: '<launch-app 1>'
, 183: '<launch-app 2>'
, 186: ';'
, 187: '='
, 188: ','
, 189: '-'
, 190: '.'
, 191: '/'
, 192: '`'
, 219: '['
, 220: '\\'
, 221: ']'
, 222: "'"
, 223: '<meta>'
, 224: '<meta>'       // firefox reports meta here.
, 226: '<alt-gr>'
, 229: '<ime-process>'
, 231: isOpera ? '`' : '<unicode>'
, 246: '<attention>'
, 247: '<crsel>'
, 248: '<exsel>'
, 249: '<erase-eof>'
, 250: '<play>'
, 251: '<zoom>'
, 252: '<no-name>'
, 253: '<pa-1>'
, 254: '<clear>'
}

for(i = 58; i < 65; ++i) {
  output[i] = String.fromCharCode(i)
}

// 0-9
for(i = 48; i < 58; ++i) {
  output[i] = (i - 48)+''
}

// A-Z
for(i = 65; i < 91; ++i) {
  output[i] = String.fromCharCode(i)
}

// num0-9
for(i = 96; i < 107; ++i) {
  output[i] = '<num-'+(i - 96)+'>'
}

// F1-F24
for(i = 112; i < 136; ++i) {
  output[i] = 'F'+(i-111)
}

},{}],16:[function(require,module,exports){
var EventEmitter = require('events').EventEmitter;
var inherits = require('inherits');

module.exports = Mouse;
inherits(Mouse, EventEmitter);

function Mouse(game){
  this.game = game || {};
  this.el = game.canvas;
  this.initializeListeners();
}

Mouse.prototype.initializeListeners = function(){
  var self = this;

  this.el.addEventListener('click', function(e){
    e.preventDefault();
    
    self.calculateOffset(e, function(location){
      self.emit('click', location);
    });
    return false;
  }, false);

  this.el.addEventListener('mousedown', function(e){
    e.preventDefault();

    self.calculateOffset(e, function(location){
      self.emit('mousedown', location);
    });
    return false;
  }, false);

  this.el.addEventListener('mouseup', function(e){
    e.preventDefault();

    self.calculateOffset(e, function(location){
      self.emit('mouseup', location);
    });

    return false;
  }, false);

  this.el.addEventListener('mousemove', function(e){
    e.preventDefault();

    self.calculateOffset(e, function(location){
      self.emit('mousemove', location);
    });
    return false;
  }, false);
};

Mouse.prototype.calculateOffset = function(e, callback){
  var canvas = e.target;
  var offsetX = canvas.offsetLeft - canvas.scrollLeft;
  var offsetY = canvas.offsetTop - canvas.scrollTop;

  var location = {
    x: e.pageX - offsetX,
    y: e.pageY - offsetY
  };

  callback(location);
}

},{"events":6,"inherits":17}],17:[function(require,module,exports){
module.exports=require(9)
},{}],18:[function(require,module,exports){
var EventEmitter = require('events').EventEmitter;
var inherits = require('inherits');

module.exports = Scenes;

function Scenes(game){
  this.game = game || {};
  this.scenes = [];
  this.active = null;
  this.previous = null;
  var self = this;

  this.game.on('update', function(interval){
    if (self.active) self.active.update(interval);
  });

  this.game.on('draw', function(context){
    if (self.active) self.active.draw(context);
  });
};

Scenes.prototype.add = function(scene){
  this.scenes.push(scene);
  return this;
};

Scenes.prototype.create = function(options){
  var scene = new Scene(options);
  this.add(scene);
  return scene;
};

Scenes.prototype.set = function(scene){
  if (this.active !== null) this.active.emit('end');
  this.active = scene;
  scene.emit('start', scene);
};

Scenes.prototype.get = function(sceneName){
  for (var i=0; i<this.scenes.length; i++){
    if (this.scenes[i].name === sceneName) {
      return this.scenes[i];
    }
  }
};


exports.Scene = Scene;
inherits(Scene, EventEmitter);

function Scene(options){
  for (var key in options){
    this[key] = options[key];
  }
}

Scene.prototype.update = function(interval){
  this.emit('update', interval)
};

Scene.prototype.draw = function(context){
  this.emit('draw', context);
};

},{"events":6,"inherits":19}],19:[function(require,module,exports){
module.exports=require(9)
},{}],20:[function(require,module,exports){
;(function (exports) {
    var ImageSet = function(params) {
        if (params === undefined) 
            params = {}
        var list = params.obj || [];
        var success = params.fn || undefined;
        var error = params.fn2 || undefined;
        var count = 0;
        if (params.Image !== undefined)
            Image = params.Image;
        var myimages = {};
        this.add = function(src) {
            list.push(src);
            return this
        }
        this.success = function(fn) {
            success = fn;
            return this
        }
        this.error = function(fn) {
            error = fn;
            return this
        }
        this.loaded = function() {
            count++;
            if (count === list.length) {
                success(myimages);
            }
        };
        this.done = function() {
            if (success !== undefined)
                list.forEach(function(src) {
                    var that = this;
                    var img = new Image();
                    img.onerror = function() {
                        if (error !== undefined) error("image load error!");
                    };
                    img.onabort = function() {
                        if (error !== undefined) error("image load abort!");
                    };
                    img.onload = function() {
                        that.loaded();
                    };
                    img.src = src;
                    img.name = src.slice(src.lastIndexOf('/')+1);
                    myimages[img.name] = img;
                },this);
        };
    };
    if (exports.Window !== undefined) {
        exports.Preloader = ImageSet;
    } else if ((module !== undefined) && (module.exports !== undefined)) {
        exports = module.exports = ImageSet;
    }
})(typeof exports === 'undefined' ?  this : exports)

},{}],21:[function(require,module,exports){
module.exports=require(9)
},{}],22:[function(require,module,exports){
/*
 * tic
 * https://github.com/shama/tic
 *
 * Copyright (c) 2013 Kyle Robinson Young
 * Licensed under the MIT license.
 */

function Tic() { this._things = []; }
module.exports = function() { return new Tic(); };

Tic.prototype._stack = function(thing) {
  var self = this;
  self._things.push(thing);
  var i = self._things.length - 1;
  return function() { delete self._things[i]; }
};

Tic.prototype.interval = Tic.prototype.setInterval = function(fn, at) {
  return this._stack({
    fn: fn, at: at, args: Array.prototype.slice.call(arguments, 2),
    elapsed: 0, once: false
  });
};

Tic.prototype.timeout = Tic.prototype.setTimeout = function(fn, at) {
  return this._stack({
    fn: fn, at: at, args: Array.prototype.slice.call(arguments, 2),
    elapsed: 0, once: true
  });
};

Tic.prototype.tick = function(dt) {
  var self = this;
  self._things.forEach(function(thing, i) {
    thing.elapsed += dt;
    if (thing.elapsed > thing.at) {
      thing.elapsed -= thing.at;
      thing.fn.apply(thing.fn, thing.args || []);
      if (thing.once) {
        delete self._things[i];
      }
    }
  });
};

},{}],23:[function(require,module,exports){
var inherits = require('inherits');
var Entity = require('crtrdg-entity');
var aabb = require('aabb-2d');

var MathUtil = require('./util/math');

module.exports = NPC;

var MAX_NPC_FRICTION = 0.2;

function NPC(options) {
  Entity.call(this);
  var self = this;

  this.game = options.game;
  this.map = options.map;
  this.camera = options.camera;

  this.size = {
    x: 64,
    y: 64
  };
  this.velocity = {
    x: 0,
    y: 0
  };
  this.position = options.position;

  this.setBoundingBox();

  /* Set boundary width/height for NPC to walk in between */
  this.boundary = {
    x: this.position.x,
    y: this.position.y,
    width: (this.size.x * MathUtil.randomInt(4, 10)) + this.position.x,
    height: (this.size.y * MathUtil.randomInt(4, 10)) + this.position.y
  };

  this.speed = 18;
  this.friction = (Math.random() * MAX_NPC_FRICTION);
  this.health = 100;
  this.strength = 5;
  this.color = '#ff0099';
  this.visible = true;
  this.points = 0;
  this.direction = "up";
  this.paths = ['horizontal', 'vertical', 'static'];
  this.zombie = false;

  // Verify received valid path or default to horizontal
  if (options.path > -1 && options.path < 3) {
    this.path = this.paths[options.path];
  } else {
    this.path = 'horizontal';
  }

  this.on('update', function(interval) {
    self.move();
    self.setBoundingBox();
    self.velocity.x *= self.friction;
    self.velocity.y *= self.friction;
    self.boundaries();
  });

  this.on('draw', function(c) {
    c.save();

    if (self.zombie){
      self.turnedImage.draw(c);
    }
    else if (self.image){
      self.image.draw(c);
    }

    else {
      c.fillStyle = self.color;
      c.fillRect(
        self.position.x,
        self.position.y,
        self.size.x,
        self.size.y
      );
    }
    c.restore();
  });
}

inherits(NPC, Entity);

/*
 * move function - Kicks off moving NPC in intial direction when NPC is created.
 * Note during game play, NPC be redirected by boundary function. e.g. hit boundary
 */
NPC.prototype.move = function() {
  if (this.path === 'horizontal') {
    if (this.direction === 'right') {
      this.moveRight();
    } else {
      this.moveLeft();
    }
  } else if (this.path === 'vertical') {
    if (this.direction === 'up') {
      this.moveUp();
    } else {
      this.moveDown();
    }
  } else {
    this.moveStop();
  }

  this.position.x += this.velocity.x * this.friction;
  this.position.y += this.velocity.y * this.friction;
};

/* 
 * NPC will walk between boundaries or edge of map
 */
NPC.prototype.boundaries = function() {
  /* Moving Horizontal Left and went out of bounds */
  if (this.position.x <= this.boundary.x) {
    if (this.position.x <= 0) {
      this.position.x = 0;
    } else {
      this.position.x = this.boundary.x;
    }
    this.moveRight();
  }

  /* Moving Horizontal Right and went out of bounds */
  if (this.position.x >= this.boundary.width - this.size.x) {
    this.position.x = this.boundary.width - this.size.x;
    this.moveLeft();
  }

    /* Moving Horizontal Right and went out of bounds */
  if (this.position.x >= this.map.width - this.size.x) {
    this.position.x = this.map.width - this.size.x;
    this.moveLeft();
  }

  /* Moving Vertical Up and went out of bounds */
  if (this.position.y <= this.boundary.y) {
    if (this.position.y <= 0) {
      this.position.y = 0;
    } else {
      this.position.y = this.boundary.y;
    }
    this.moveDown();
  }

  /* Moving Vertical Down and went out of bounds */
  if ((this.position.y >= this.boundary.height - this.size.y) || (this.position.y >= this.map.height - this.size.y)) {
    this.position.y = this.boundary.height - this.size.y;
    this.moveUp();
  }

  if (this.position.y >= this.map.height - this.size.y) {
    this.position.y = this.map.height - this.size.y;
    this.moveUp();
  }
};

/* Stops NPC and sets path to static i.e. stopped */
NPC.prototype.moveStop = function() {
  this.path = "static";
};

NPC.prototype.moveUp = function() {
  this.velocity.y -= this.speed;
  this.direction = "up";
};

NPC.prototype.moveDown = function() {
  this.velocity.y += this.speed;
  this.direction = "down";
};

NPC.prototype.moveLeft = function() {
  this.velocity.x -= this.speed;
  this.direction = "left";
};

NPC.prototype.moveRight = function() {
  this.velocity.x += this.speed;
  this.direction = "right";
};


NPC.prototype.touches = function(entity){
  if (entity.exists) return this.boundingBox.intersects(entity.boundingBox);
  else return false;
}

NPC.prototype.setBoundingBox = function(){
  this.boundingBox = aabb([this.position.x, this.position.y], [this.size.x, this.size.y]);  
};
},{"./util/math":25,"aabb-2d":4,"crtrdg-entity":8,"inherits":21}],24:[function(require,module,exports){
var inherits = require('inherits');
var Entity = require('crtrdg-entity');
var aabb = require('aabb-2d');

module.exports = Player;

function Player(options){
  Entity.call(this);
  var self = this;

  this.game = options.game;
  this.keysDown = options.keysDown;
  this.camera = options.camera;

  this.size = { x: 64, y: 64 };
  this.velocity = { x: 0, y: 0 };
  this.position = options.position;

  this.speed = 18;
  this.friction = 0.4;
  this.health = 100;
  this.strength = 5;
  this.visible = true;
  this.points = 0;
  this.attacking = false;

  this.setBoundingBox();

  this.on('update', function(interval){
    self.attacking = false;
    self.input(self.keysDown);
    self.move();
    self.setBoundingBox();
    self.velocity.x *= self.friction;
    self.velocity.y *= self.friction;
    self.boundaries();
  });

  this.on('draw', function(c){
    c.save();
    if (self.attacking) self.attackingImage.draw(c);
    else self.image.draw(c)
    c.restore();
  });
}

inherits(Player, Entity);

Player.prototype.move = function(){
  this.position.x += this.velocity.x * this.friction;
  this.position.y += this.velocity.y * this.friction;
};


Player.prototype.boundaries = function(){
  if (this.position.x <= 0){
    this.position.x = 0;
  }

  if (this.position.x >= this.camera.map.width - this.size.x){
    this.position.x = this.camera.map.width - this.size.x;
  }

  if (this.position.y <= 0){
    this.position.y = 0;
  }

  if (this.position.y >= this.camera.map.height - this.size.y){
    this.position.y = this.camera.map.height - this.size.y;
  }
};

Player.prototype.input = function(){
  if ('W' in this.keysDown){
    this.velocity.y -= this.speed;
    this.direction = "up";
  }

  if ('S' in this.keysDown){
    this.velocity.y += this.speed;
    this.direction = "down";
  }

  if ('A' in this.keysDown){
    this.velocity.x -= this.speed;
    this.direction = "left";
  }

  if ('D' in this.keysDown){
    this.velocity.x += this.speed;
    this.direction = "right";
  }

  if ('K' in this.keysDown){
    this.attacking = true;
  }
};

Player.prototype.touches = function(entity){
  if (entity.exists) return this.boundingBox.intersects(entity.boundingBox);
  else return false;
}

Player.prototype.setBoundingBox = function(){
  this.boundingBox = aabb([this.position.x, this.position.y], [this.size.x, this.size.y]);  
};
},{"aabb-2d":4,"crtrdg-entity":8,"inherits":21}],25:[function(require,module,exports){
function randomInt(min, max) {
  return Math.floor(Math.random() * (max - min + 1) + min);
}

function randomRGBA(rmin, rmax, gmin, gmax, bmin, bmax, alpha){
  var r = randomInt(rmin, rmax);
  var g = randomInt(gmin, gmax);
  var b = randomInt(bmin, bmax);
  return 'rgba(' + r + ', ' + g + ', ' + b + ', ' + alpha + ')';
}

function randomGray(min, max){
  var num = randomInt(min, max);
  return 'rgb(' + num + ', ' + num + ', ' + num + ')';
}

function randomGrayAlpha(min, max, alpha){
  var num = randomInt(min, max);
  return 'rgb(' + num + ', ' + num + ', ' + num + ', ' + alpha + ')';
}

function randomRGB(rmin, rmax, gmin, gmax, bmin, bmax){
  var r = randomInt(rmin, rmax);
  var g = randomInt(gmin, gmax);
  var b = randomInt(bmin, bmax);
  return 'rgb(' + r + ', ' + g + ', ' + b + ')';
}

module.exports = {
  randomInt: randomInt,
  randomRGB: randomRGB,
  randomRGBA: randomRGBA,
  randomGray: randomGray,
  randomGrayAlpha: randomGray
};
},{}],26:[function(require,module,exports){
var tic = require('tic')();

module.exports = Sprite;

/*

var sprite = new Sprite({
	entity: player,
	image: image,
	frames: 4,
	fps: 20,
})

*/

function Sprite(options) {

	this.fps = options.fps;
	this.image = options.image;
	this.frames = options.frames;
	this.entity = options.entity;

  this.currentFrame = 0;
  this.timeSinceLastFrame = 0;
	this.frameWidth = this.image.width / this.frames;
	this.timeBetweenFrames = 1/this.fps;
	this.timeSinceLastFrame = this.timeBetweenFrames;

	var self = this;

	tic.interval(function(wat) {
		self.currentFrame += 1;
		if (self.currentFrame == self.frames) self.currentFrame = 0;
	}, 1000 / this.fps, 'Every');

	this.entity.on('update', function(dt){
		tic.tick(dt);
	});
}

Sprite.prototype.draw = function(context){
	var frame = this.frameWidth * this.currentFrame;
  context.drawImage(
  	this.image, 
  	this.frameWidth * this.currentFrame,
  	0,
  	this.frameWidth, 
  	this.image.height, 
  	this.entity.position.x - this.entity.camera.position.x,
  	this.entity.position.y - this.entity.camera.position.y,
  	this.frameWidth, 
  	this.image.height
  );
};

},{"tic":22}]},{},[2])