/**
 * @license
 * cardboard-vr-display
 * Copyright (c) 2015-2017 Google
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @license
 * gl-preserve-state
 * Copyright (c) 2016, Brandon Jones.
 *
 * 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.
 */

/**
 * @license
 * webvr-polyfill-dpdb
 * Copyright (c) 2015-2017 Google
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @license
 * nosleep.js
 * Copyright (c) 2017, Rich Tibbett
 *
 * 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 (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
	typeof define === 'function' && define.amd ? define(factory) :
	(global.CardboardVRDisplay = factory());
}(this, (function () { 'use strict';

var asyncGenerator = function () {
  function AwaitValue(value) {
    this.value = value;
  }

  function AsyncGenerator(gen) {
    var front, back;

    function send(key, arg) {
      return new Promise(function (resolve, reject) {
        var request = {
          key: key,
          arg: arg,
          resolve: resolve,
          reject: reject,
          next: null
        };

        if (back) {
          back = back.next = request;
        } else {
          front = back = request;
          resume(key, arg);
        }
      });
    }

    function resume(key, arg) {
      try {
        var result = gen[key](arg);
        var value = result.value;

        if (value instanceof AwaitValue) {
          Promise.resolve(value.value).then(function (arg) {
            resume("next", arg);
          }, function (arg) {
            resume("throw", arg);
          });
        } else {
          settle(result.done ? "return" : "normal", result.value);
        }
      } catch (err) {
        settle("throw", err);
      }
    }

    function settle(type, value) {
      switch (type) {
        case "return":
          front.resolve({
            value: value,
            done: true
          });
          break;

        case "throw":
          front.reject(value);
          break;

        default:
          front.resolve({
            value: value,
            done: false
          });
          break;
      }

      front = front.next;

      if (front) {
        resume(front.key, front.arg);
      } else {
        back = null;
      }
    }

    this._invoke = send;

    if (typeof gen.return !== "function") {
      this.return = undefined;
    }
  }

  if (typeof Symbol === "function" && Symbol.asyncIterator) {
    AsyncGenerator.prototype[Symbol.asyncIterator] = function () {
      return this;
    };
  }

  AsyncGenerator.prototype.next = function (arg) {
    return this._invoke("next", arg);
  };

  AsyncGenerator.prototype.throw = function (arg) {
    return this._invoke("throw", arg);
  };

  AsyncGenerator.prototype.return = function (arg) {
    return this._invoke("return", arg);
  };

  return {
    wrap: function (fn) {
      return function () {
        return new AsyncGenerator(fn.apply(this, arguments));
      };
    },
    await: function (value) {
      return new AwaitValue(value);
    }
  };
}();





var classCallCheck = function (instance, Constructor) {
  if (!(instance instanceof Constructor)) {
    throw new TypeError("Cannot call a class as a function");
  }
};

var createClass = function () {
  function defineProperties(target, props) {
    for (var i = 0; i < props.length; i++) {
      var descriptor = props[i];
      descriptor.enumerable = descriptor.enumerable || false;
      descriptor.configurable = true;
      if ("value" in descriptor) descriptor.writable = true;
      Object.defineProperty(target, descriptor.key, descriptor);
    }
  }

  return function (Constructor, protoProps, staticProps) {
    if (protoProps) defineProperties(Constructor.prototype, protoProps);
    if (staticProps) defineProperties(Constructor, staticProps);
    return Constructor;
  };
}();



























var slicedToArray = function () {
  function sliceIterator(arr, i) {
    var _arr = [];
    var _n = true;
    var _d = false;
    var _e = undefined;

    try {
      for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {
        _arr.push(_s.value);

        if (i && _arr.length === i) break;
      }
    } catch (err) {
      _d = true;
      _e = err;
    } finally {
      try {
        if (!_n && _i["return"]) _i["return"]();
      } finally {
        if (_d) throw _e;
      }
    }

    return _arr;
  }

  return function (arr, i) {
    if (Array.isArray(arr)) {
      return arr;
    } else if (Symbol.iterator in Object(arr)) {
      return sliceIterator(arr, i);
    } else {
      throw new TypeError("Invalid attempt to destructure non-iterable instance");
    }
  };
}();

var MIN_TIMESTEP = 0.001;
var MAX_TIMESTEP = 1;
var dataUri = function dataUri(mimeType, svg) {
  return 'data:' + mimeType + ',' + encodeURIComponent(svg);
};

var lerp = function lerp(a, b, t) {
  return a + (b - a) * t;
};
var isIOS = function () {
  var isIOS = /iPad|iPhone|iPod/.test(navigator.platform);
  return function () {
    return isIOS;
  };
}();
var isWebViewAndroid = function () {
  var isWebViewAndroid = navigator.userAgent.indexOf('Version') !== -1 && navigator.userAgent.indexOf('Android') !== -1 && navigator.userAgent.indexOf('Chrome') !== -1;
  return function () {
    return isWebViewAndroid;
  };
}();
var isSafari = function () {
  var isSafari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
  return function () {
    return isSafari;
  };
}();
var isFirefoxAndroid = function () {
  var isFirefoxAndroid = navigator.userAgent.indexOf('Firefox') !== -1 && navigator.userAgent.indexOf('Android') !== -1;
  return function () {
    return isFirefoxAndroid;
  };
}();
var getChromeVersion = function () {
  var match = navigator.userAgent.match(/.*Chrome\/([0-9]+)/);
  var value = match ? parseInt(match[1], 10) : null;
  return function () {
    return value;
  };
}();
var isSafariWithoutDeviceMotion = function () {
  var value = false;
  value = isIOS() && isSafari() && navigator.userAgent.indexOf('13_4') !== -1;
  return function () {
    return value;
  };
}();
var isChromeWithoutDeviceMotion = function () {
  var value = false;
  if (getChromeVersion() === 65) {
    var match = navigator.userAgent.match(/.*Chrome\/([0-9\.]*)/);
    if (match) {
      var _match$1$split = match[1].split('.'),
          _match$1$split2 = slicedToArray(_match$1$split, 4),
          major = _match$1$split2[0],
          minor = _match$1$split2[1],
          branch = _match$1$split2[2],
          build = _match$1$split2[3];
      value = parseInt(branch, 10) === 3325 && parseInt(build, 10) < 148;
    }
  }
  return function () {
    return value;
  };
}();
var isR7 = function () {
  var isR7 = navigator.userAgent.indexOf('R7 Build') !== -1;
  return function () {
    return isR7;
  };
}();
var isLandscapeMode = function isLandscapeMode() {
  var rtn = window.orientation == 90 || window.orientation == -90;
  return isR7() ? !rtn : rtn;
};
var isTimestampDeltaValid = function isTimestampDeltaValid(timestampDeltaS) {
  if (isNaN(timestampDeltaS)) {
    return false;
  }
  if (timestampDeltaS <= MIN_TIMESTEP) {
    return false;
  }
  if (timestampDeltaS > MAX_TIMESTEP) {
    return false;
  }
  return true;
};
var getScreenWidth = function getScreenWidth() {
  return Math.max(window.screen.width, window.screen.height) * window.devicePixelRatio;
};
var getScreenHeight = function getScreenHeight() {
  return Math.min(window.screen.width, window.screen.height) * window.devicePixelRatio;
};
var requestFullscreen = function requestFullscreen(element) {
  if (isWebViewAndroid()) {
    return false;
  }
  if (element.requestFullscreen) {
    element.requestFullscreen();
  } else if (element.webkitRequestFullscreen) {
    element.webkitRequestFullscreen();
  } else if (element.mozRequestFullScreen) {
    element.mozRequestFullScreen();
  } else if (element.msRequestFullscreen) {
    element.msRequestFullscreen();
  } else {
    return false;
  }
  return true;
};
var exitFullscreen = function exitFullscreen() {
  if (document.exitFullscreen) {
    document.exitFullscreen();
  } else if (document.webkitExitFullscreen) {
    document.webkitExitFullscreen();
  } else if (document.mozCancelFullScreen) {
    document.mozCancelFullScreen();
  } else if (document.msExitFullscreen) {
    document.msExitFullscreen();
  } else {
    return false;
  }
  return true;
};
var getFullscreenElement = function getFullscreenElement() {
  return document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement;
};
var linkProgram = function linkProgram(gl, vertexSource, fragmentSource, attribLocationMap) {
  var vertexShader = gl.createShader(gl.VERTEX_SHADER);
  gl.shaderSource(vertexShader, vertexSource);
  gl.compileShader(vertexShader);
  var fragmentShader = gl.createShader(gl.FRAGMENT_SHADER);
  gl.shaderSource(fragmentShader, fragmentSource);
  gl.compileShader(fragmentShader);
  var program = gl.createProgram();
  gl.attachShader(program, vertexShader);
  gl.attachShader(program, fragmentShader);
  for (var attribName in attribLocationMap) {
    gl.bindAttribLocation(program, attribLocationMap[attribName], attribName);
  }gl.linkProgram(program);
  gl.deleteShader(vertexShader);
  gl.deleteShader(fragmentShader);
  return program;
};
var getProgramUniforms = function getProgramUniforms(gl, program) {
  var uniforms = {};
  var uniformCount = gl.getProgramParameter(program, gl.ACTIVE_UNIFORMS);
  var uniformName = '';
  for (var i = 0; i < uniformCount; i++) {
    var uniformInfo = gl.getActiveUniform(program, i);
    uniformName = uniformInfo.name.replace('[0]', '');
    uniforms[uniformName] = gl.getUniformLocation(program, uniformName);
  }
  return uniforms;
};
var orthoMatrix = function orthoMatrix(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;
};

var isMobile = function isMobile() {
  var check = false;
  (function (a) {
    if (/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino/i.test(a) || /1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(a.substr(0, 4))) check = true;
  })(navigator.userAgent || navigator.vendor || window.opera);
  return check;
};
var extend = function extend(dest, src) {
  for (var key in src) {
    if (src.hasOwnProperty(key)) {
      dest[key] = src[key];
    }
  }
  return dest;
};
var safariCssSizeWorkaround = function safariCssSizeWorkaround(canvas) {
  if (isIOS()) {
    var width = canvas.style.width;
    var height = canvas.style.height;
    canvas.style.width = parseInt(width) + 1 + 'px';
    canvas.style.height = parseInt(height) + 'px';
    setTimeout(function () {
      canvas.style.width = width;
      canvas.style.height = height;
    }, 100);
  }
  window.canvas = canvas;
};
var frameDataFromPose = function () {
  var piOver180 = Math.PI / 180.0;
  var rad45 = Math.PI * 0.25;
  function mat4_perspectiveFromFieldOfView(out, fov, near, far) {
    var upTan = Math.tan(fov ? fov.upDegrees * piOver180 : rad45),
        downTan = Math.tan(fov ? fov.downDegrees * piOver180 : rad45),
        leftTan = Math.tan(fov ? fov.leftDegrees * piOver180 : rad45),
        rightTan = Math.tan(fov ? fov.rightDegrees * piOver180 : rad45),
        xScale = 2.0 / (leftTan + rightTan),
        yScale = 2.0 / (upTan + downTan);
    out[0] = xScale;
    out[1] = 0.0;
    out[2] = 0.0;
    out[3] = 0.0;
    out[4] = 0.0;
    out[5] = yScale;
    out[6] = 0.0;
    out[7] = 0.0;
    out[8] = -((leftTan - rightTan) * xScale * 0.5);
    out[9] = (upTan - downTan) * yScale * 0.5;
    out[10] = far / (near - far);
    out[11] = -1.0;
    out[12] = 0.0;
    out[13] = 0.0;
    out[14] = far * near / (near - far);
    out[15] = 0.0;
    return out;
  }
  function mat4_fromRotationTranslation(out, q, v) {
    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;
  }
  function mat4_translate(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;
  }
  function mat4_invert(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,
    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;
  }
  var defaultOrientation = new Float32Array([0, 0, 0, 1]);
  var defaultPosition = new Float32Array([0, 0, 0]);
  function updateEyeMatrices(projection, view, pose, fov, offset, vrDisplay) {
    mat4_perspectiveFromFieldOfView(projection, fov || null, vrDisplay.depthNear, vrDisplay.depthFar);
    var orientation = pose.orientation || defaultOrientation;
    var position = pose.position || defaultPosition;
    mat4_fromRotationTranslation(view, orientation, position);
    if (offset) mat4_translate(view, view, offset);
    mat4_invert(view, view);
  }
  return function (frameData, pose, vrDisplay) {
    if (!frameData || !pose) return false;
    frameData.pose = pose;
    frameData.timestamp = pose.timestamp;
    updateEyeMatrices(frameData.leftProjectionMatrix, frameData.leftViewMatrix, pose, vrDisplay._getFieldOfView("left"), vrDisplay._getEyeOffset("left"), vrDisplay);
    updateEyeMatrices(frameData.rightProjectionMatrix, frameData.rightViewMatrix, pose, vrDisplay._getFieldOfView("right"), vrDisplay._getEyeOffset("right"), vrDisplay);
    return true;
  };
}();
var isInsideCrossOriginIFrame = function isInsideCrossOriginIFrame() {
  var isFramed = window.self !== window.top;
  var refOrigin = getOriginFromUrl(document.referrer);
  var thisOrigin = getOriginFromUrl(window.location.href);
  return isFramed && refOrigin !== thisOrigin;
};
var getOriginFromUrl = function getOriginFromUrl(url) {
  var domainIdx;
  var protoSepIdx = url.indexOf("://");
  if (protoSepIdx !== -1) {
    domainIdx = protoSepIdx + 3;
  } else {
    domainIdx = 0;
  }
  var domainEndIdx = url.indexOf('/', domainIdx);
  if (domainEndIdx === -1) {
    domainEndIdx = url.length;
  }
  return url.substring(0, domainEndIdx);
};
var getQuaternionAngle = function getQuaternionAngle(quat) {
  if (quat.w > 1) {
    console.warn('getQuaternionAngle: w > 1');
    return 0;
  }
  var angle = 2 * Math.acos(quat.w);
  return angle;
};
var warnOnce = function () {
  var observedWarnings = {};
  return function (key, message) {
    if (observedWarnings[key] === undefined) {
      console.warn('webvr-polyfill: ' + message);
      observedWarnings[key] = true;
    }
  };
}();
var deprecateWarning = function deprecateWarning(deprecated, suggested) {
  var alternative = suggested ? 'Please use ' + suggested + ' instead.' : '';
  warnOnce(deprecated, deprecated + ' has been deprecated. ' + 'This may not work on native WebVR displays. ' + alternative);
};

function WGLUPreserveGLState(gl, bindings, callback) {
  if (!bindings) {
    callback(gl);
    return;
  }
  var boundValues = [];
  var activeTexture = null;
  for (var i = 0; i < bindings.length; ++i) {
    var binding = bindings[i];
    switch (binding) {
      case gl.TEXTURE_BINDING_2D:
      case gl.TEXTURE_BINDING_CUBE_MAP:
        var textureUnit = bindings[++i];
        if (textureUnit < gl.TEXTURE0 || textureUnit > gl.TEXTURE31) {
          console.error("TEXTURE_BINDING_2D or TEXTURE_BINDING_CUBE_MAP must be followed by a valid texture unit");
          boundValues.push(null, null);
          break;
        }
        if (!activeTexture) {
          activeTexture = gl.getParameter(gl.ACTIVE_TEXTURE);
        }
        gl.activeTexture(textureUnit);
        boundValues.push(gl.getParameter(binding), null);
        break;
      case gl.ACTIVE_TEXTURE:
        activeTexture = gl.getParameter(gl.ACTIVE_TEXTURE);
        boundValues.push(null);
        break;
      default:
        boundValues.push(gl.getParameter(binding));
        break;
    }
  }
  callback(gl);
  for (var i = 0; i < bindings.length; ++i) {
    var binding = bindings[i];
    var boundValue = boundValues[i];
    switch (binding) {
      case gl.ACTIVE_TEXTURE:
        break;
      case gl.ARRAY_BUFFER_BINDING:
        gl.bindBuffer(gl.ARRAY_BUFFER, boundValue);
        break;
      case gl.COLOR_CLEAR_VALUE:
        gl.clearColor(boundValue[0], boundValue[1], boundValue[2], boundValue[3]);
        break;
      case gl.COLOR_WRITEMASK:
        gl.colorMask(boundValue[0], boundValue[1], boundValue[2], boundValue[3]);
        break;
      case gl.CURRENT_PROGRAM:
        gl.useProgram(boundValue);
        break;
      case gl.ELEMENT_ARRAY_BUFFER_BINDING:
        gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, boundValue);
        break;
      case gl.FRAMEBUFFER_BINDING:
        gl.bindFramebuffer(gl.FRAMEBUFFER, boundValue);
        break;
      case gl.RENDERBUFFER_BINDING:
        gl.bindRenderbuffer(gl.RENDERBUFFER, boundValue);
        break;
      case gl.TEXTURE_BINDING_2D:
        var textureUnit = bindings[++i];
        if (textureUnit < gl.TEXTURE0 || textureUnit > gl.TEXTURE31)
          break;
        gl.activeTexture(textureUnit);
        gl.bindTexture(gl.TEXTURE_2D, boundValue);
        break;
      case gl.TEXTURE_BINDING_CUBE_MAP:
        var textureUnit = bindings[++i];
        if (textureUnit < gl.TEXTURE0 || textureUnit > gl.TEXTURE31)
          break;
        gl.activeTexture(textureUnit);
        gl.bindTexture(gl.TEXTURE_CUBE_MAP, boundValue);
        break;
      case gl.VIEWPORT:
        gl.viewport(boundValue[0], boundValue[1], boundValue[2], boundValue[3]);
        break;
      case gl.BLEND:
      case gl.CULL_FACE:
      case gl.DEPTH_TEST:
      case gl.SCISSOR_TEST:
      case gl.STENCIL_TEST:
        if (boundValue) {
          gl.enable(binding);
        } else {
          gl.disable(binding);
        }
        break;
      default:
        console.log("No GL restore behavior for 0x" + binding.toString(16));
        break;
    }
    if (activeTexture) {
      gl.activeTexture(activeTexture);
    }
  }
}
var glPreserveState = WGLUPreserveGLState;

var distortionVS = ['attribute vec2 position;', 'attribute vec3 texCoord;', 'varying vec2 vTexCoord;', 'uniform vec4 viewportOffsetScale[2];', 'void main() {', '  vec4 viewport = viewportOffsetScale[int(texCoord.z)];', '  vTexCoord = (texCoord.xy * viewport.zw) + viewport.xy;', '  gl_Position = vec4( position, 1.0, 1.0 );', '}'].join('\n');
var distortionFS = ['precision mediump float;', 'uniform sampler2D diffuse;', 'varying vec2 vTexCoord;', 'void main() {', '  gl_FragColor = texture2D(diffuse, vTexCoord);', '}'].join('\n');
function CardboardDistorter(gl, cardboardUI, bufferScale, dirtySubmitFrameBindings) {
  this.gl = gl;
  this.cardboardUI = cardboardUI;
  this.bufferScale = bufferScale;
  this.dirtySubmitFrameBindings = dirtySubmitFrameBindings;
  this.ctxAttribs = gl.getContextAttributes();
  this.instanceExt = gl.getExtension('ANGLE_instanced_arrays');
  this.meshWidth = 20;
  this.meshHeight = 20;
  this.bufferWidth = gl.drawingBufferWidth;
  this.bufferHeight = gl.drawingBufferHeight;
  this.realBindFramebuffer = gl.bindFramebuffer;
  this.realEnable = gl.enable;
  this.realDisable = gl.disable;
  this.realColorMask = gl.colorMask;
  this.realClearColor = gl.clearColor;
  this.realViewport = gl.viewport;
  if (!isIOS()) {
    this.realCanvasWidth = Object.getOwnPropertyDescriptor(gl.canvas.__proto__, 'width');
    this.realCanvasHeight = Object.getOwnPropertyDescriptor(gl.canvas.__proto__, 'height');
  }
  this.isPatched = false;
  this.lastBoundFramebuffer = null;
  this.cullFace = false;
  this.depthTest = false;
  this.blend = false;
  this.scissorTest = false;
  this.stencilTest = false;
  this.viewport = [0, 0, 0, 0];
  this.colorMask = [true, true, true, true];
  this.clearColor = [0, 0, 0, 0];
  this.attribs = {
    position: 0,
    texCoord: 1
  };
  this.program = linkProgram(gl, distortionVS, distortionFS, this.attribs);
  this.uniforms = getProgramUniforms(gl, this.program);
  this.viewportOffsetScale = new Float32Array(8);
  this.setTextureBounds();
  this.vertexBuffer = gl.createBuffer();
  this.indexBuffer = gl.createBuffer();
  this.indexCount = 0;
  this.renderTarget = gl.createTexture();
  this.framebuffer = gl.createFramebuffer();
  this.depthStencilBuffer = null;
  this.depthBuffer = null;
  this.stencilBuffer = null;
  if (this.ctxAttribs.depth && this.ctxAttribs.stencil) {
    this.depthStencilBuffer = gl.createRenderbuffer();
  } else if (this.ctxAttribs.depth) {
    this.depthBuffer = gl.createRenderbuffer();
  } else if (this.ctxAttribs.stencil) {
    this.stencilBuffer = gl.createRenderbuffer();
  }
  this.patch();
  this.onResize();
}
CardboardDistorter.prototype.destroy = function () {
  var gl = this.gl;
  this.unpatch();
  gl.deleteProgram(this.program);
  gl.deleteBuffer(this.vertexBuffer);
  gl.deleteBuffer(this.indexBuffer);
  gl.deleteTexture(this.renderTarget);
  gl.deleteFramebuffer(this.framebuffer);
  if (this.depthStencilBuffer) {
    gl.deleteRenderbuffer(this.depthStencilBuffer);
  }
  if (this.depthBuffer) {
    gl.deleteRenderbuffer(this.depthBuffer);
  }
  if (this.stencilBuffer) {
    gl.deleteRenderbuffer(this.stencilBuffer);
  }
  if (this.cardboardUI) {
    this.cardboardUI.destroy();
  }
};
CardboardDistorter.prototype.onResize = function () {
  var gl = this.gl;
  var self = this;
  var glState = [gl.RENDERBUFFER_BINDING, gl.TEXTURE_BINDING_2D, gl.TEXTURE0];
  glPreserveState(gl, glState, function (gl) {
    self.realBindFramebuffer.call(gl, gl.FRAMEBUFFER, null);
    if (self.scissorTest) {
      self.realDisable.call(gl, gl.SCISSOR_TEST);
    }
    self.realColorMask.call(gl, true, true, true, true);
    self.realViewport.call(gl, 0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);
    self.realClearColor.call(gl, 0, 0, 0, 1);
    gl.clear(gl.COLOR_BUFFER_BIT);
    self.realBindFramebuffer.call(gl, gl.FRAMEBUFFER, self.framebuffer);
    gl.bindTexture(gl.TEXTURE_2D, self.renderTarget);
    gl.texImage2D(gl.TEXTURE_2D, 0, self.ctxAttribs.alpha ? gl.RGBA : gl.RGB, self.bufferWidth, self.bufferHeight, 0, self.ctxAttribs.alpha ? gl.RGBA : gl.RGB, gl.UNSIGNED_BYTE, null);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
    gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, self.renderTarget, 0);
    if (self.ctxAttribs.depth && self.ctxAttribs.stencil) {
      gl.bindRenderbuffer(gl.RENDERBUFFER, self.depthStencilBuffer);
      gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_STENCIL, self.bufferWidth, self.bufferHeight);
      gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_STENCIL_ATTACHMENT, gl.RENDERBUFFER, self.depthStencilBuffer);
    } else if (self.ctxAttribs.depth) {
      gl.bindRenderbuffer(gl.RENDERBUFFER, self.depthBuffer);
      gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, self.bufferWidth, self.bufferHeight);
      gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, self.depthBuffer);
    } else if (self.ctxAttribs.stencil) {
      gl.bindRenderbuffer(gl.RENDERBUFFER, self.stencilBuffer);
      gl.renderbufferStorage(gl.RENDERBUFFER, gl.STENCIL_INDEX8, self.bufferWidth, self.bufferHeight);
      gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.STENCIL_ATTACHMENT, gl.RENDERBUFFER, self.stencilBuffer);
    }
    if (!gl.checkFramebufferStatus(gl.FRAMEBUFFER) === gl.FRAMEBUFFER_COMPLETE) {
      console.error('Framebuffer incomplete!');
    }
    self.realBindFramebuffer.call(gl, gl.FRAMEBUFFER, self.lastBoundFramebuffer);
    if (self.scissorTest) {
      self.realEnable.call(gl, gl.SCISSOR_TEST);
    }
    self.realColorMask.apply(gl, self.colorMask);
    self.realViewport.apply(gl, self.viewport);
    self.realClearColor.apply(gl, self.clearColor);
  });
  if (this.cardboardUI) {
    this.cardboardUI.onResize();
  }
};
CardboardDistorter.prototype.patch = function () {
  if (this.isPatched) {
    return;
  }
  var self = this;
  var canvas = this.gl.canvas;
  var gl = this.gl;
  if (!isIOS()) {
    canvas.width = getScreenWidth() * this.bufferScale;
    canvas.height = getScreenHeight() * this.bufferScale;
    Object.defineProperty(canvas, 'width', {
      configurable: true,
      enumerable: true,
      get: function get() {
        return self.bufferWidth;
      },
      set: function set(value) {
        self.bufferWidth = value;
        self.realCanvasWidth.set.call(canvas, value);
        self.onResize();
      }
    });
    Object.defineProperty(canvas, 'height', {
      configurable: true,
      enumerable: true,
      get: function get() {
        return self.bufferHeight;
      },
      set: function set(value) {
        self.bufferHeight = value;
        self.realCanvasHeight.set.call(canvas, value);
        self.onResize();
      }
    });
  }
  this.lastBoundFramebuffer = gl.getParameter(gl.FRAMEBUFFER_BINDING);
  if (this.lastBoundFramebuffer == null) {
    this.lastBoundFramebuffer = this.framebuffer;
    this.gl.bindFramebuffer(gl.FRAMEBUFFER, this.framebuffer);
  }
  this.gl.bindFramebuffer = function (target, framebuffer) {
    self.lastBoundFramebuffer = framebuffer ? framebuffer : self.framebuffer;
    self.realBindFramebuffer.call(gl, target, self.lastBoundFramebuffer);
  };
  this.cullFace = gl.getParameter(gl.CULL_FACE);
  this.depthTest = gl.getParameter(gl.DEPTH_TEST);
  this.blend = gl.getParameter(gl.BLEND);
  this.scissorTest = gl.getParameter(gl.SCISSOR_TEST);
  this.stencilTest = gl.getParameter(gl.STENCIL_TEST);
  gl.enable = function (pname) {
    switch (pname) {
      case gl.CULL_FACE:
        self.cullFace = true;break;
      case gl.DEPTH_TEST:
        self.depthTest = true;break;
      case gl.BLEND:
        self.blend = true;break;
      case gl.SCISSOR_TEST:
        self.scissorTest = true;break;
      case gl.STENCIL_TEST:
        self.stencilTest = true;break;
    }
    self.realEnable.call(gl, pname);
  };
  gl.disable = function (pname) {
    switch (pname) {
      case gl.CULL_FACE:
        self.cullFace = false;break;
      case gl.DEPTH_TEST:
        self.depthTest = false;break;
      case gl.BLEND:
        self.blend = false;break;
      case gl.SCISSOR_TEST:
        self.scissorTest = false;break;
      case gl.STENCIL_TEST:
        self.stencilTest = false;break;
    }
    self.realDisable.call(gl, pname);
  };
  this.colorMask = gl.getParameter(gl.COLOR_WRITEMASK);
  gl.colorMask = function (r, g, b, a) {
    self.colorMask[0] = r;
    self.colorMask[1] = g;
    self.colorMask[2] = b;
    self.colorMask[3] = a;
    self.realColorMask.call(gl, r, g, b, a);
  };
  this.clearColor = gl.getParameter(gl.COLOR_CLEAR_VALUE);
  gl.clearColor = function (r, g, b, a) {
    self.clearColor[0] = r;
    self.clearColor[1] = g;
    self.clearColor[2] = b;
    self.clearColor[3] = a;
    self.realClearColor.call(gl, r, g, b, a);
  };
  this.viewport = gl.getParameter(gl.VIEWPORT);
  gl.viewport = function (x, y, w, h) {
    self.viewport[0] = x;
    self.viewport[1] = y;
    self.viewport[2] = w;
    self.viewport[3] = h;
    self.realViewport.call(gl, x, y, w, h);
  };
  this.isPatched = true;
  safariCssSizeWorkaround(canvas);
};
CardboardDistorter.prototype.unpatch = function () {
  if (!this.isPatched) {
    return;
  }
  var gl = this.gl;
  var canvas = this.gl.canvas;
  if (!isIOS()) {
    Object.defineProperty(canvas, 'width', this.realCanvasWidth);
    Object.defineProperty(canvas, 'height', this.realCanvasHeight);
  }
  canvas.width = this.bufferWidth;
  canvas.height = this.bufferHeight;
  gl.bindFramebuffer = this.realBindFramebuffer;
  gl.enable = this.realEnable;
  gl.disable = this.realDisable;
  gl.colorMask = this.realColorMask;
  gl.clearColor = this.realClearColor;
  gl.viewport = this.realViewport;
  if (this.lastBoundFramebuffer == this.framebuffer) {
    gl.bindFramebuffer(gl.FRAMEBUFFER, null);
  }
  this.isPatched = false;
  setTimeout(function () {
    safariCssSizeWorkaround(canvas);
  }, 1);
};
CardboardDistorter.prototype.setTextureBounds = function (leftBounds, rightBounds) {
  if (!leftBounds) {
    leftBounds = [0, 0, 0.5, 1];
  }
  if (!rightBounds) {
    rightBounds = [0.5, 0, 0.5, 1];
  }
  this.viewportOffsetScale[0] = leftBounds[0];
  this.viewportOffsetScale[1] = leftBounds[1];
  this.viewportOffsetScale[2] = leftBounds[2];
  this.viewportOffsetScale[3] = leftBounds[3];
  this.viewportOffsetScale[4] = rightBounds[0];
  this.viewportOffsetScale[5] = rightBounds[1];
  this.viewportOffsetScale[6] = rightBounds[2];
  this.viewportOffsetScale[7] = rightBounds[3];
};
CardboardDistorter.prototype.submitFrame = function () {
  var gl = this.gl;
  var self = this;
  var glState = [];
  if (!this.dirtySubmitFrameBindings) {
    glState.push(gl.CURRENT_PROGRAM, gl.ARRAY_BUFFER_BINDING, gl.ELEMENT_ARRAY_BUFFER_BINDING, gl.TEXTURE_BINDING_2D, gl.TEXTURE0);
  }
  glPreserveState(gl, glState, function (gl) {
    self.realBindFramebuffer.call(gl, gl.FRAMEBUFFER, null);
    var positionDivisor = 0;
    var texCoordDivisor = 0;
    if (self.instanceExt) {
      positionDivisor = gl.getVertexAttrib(self.attribs.position, self.instanceExt.VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE);
      texCoordDivisor = gl.getVertexAttrib(self.attribs.texCoord, self.instanceExt.VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE);
    }
    if (self.cullFace) {
      self.realDisable.call(gl, gl.CULL_FACE);
    }
    if (self.depthTest) {
      self.realDisable.call(gl, gl.DEPTH_TEST);
    }
    if (self.blend) {
      self.realDisable.call(gl, gl.BLEND);
    }
    if (self.scissorTest) {
      self.realDisable.call(gl, gl.SCISSOR_TEST);
    }
    if (self.stencilTest) {
      self.realDisable.call(gl, gl.STENCIL_TEST);
    }
    self.realColorMask.call(gl, true, true, true, true);
    self.realViewport.call(gl, 0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);
    if (self.ctxAttribs.alpha || isIOS()) {
      self.realClearColor.call(gl, 0, 0, 0, 1);
      gl.clear(gl.COLOR_BUFFER_BIT);
    }
    gl.useProgram(self.program);
    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, self.indexBuffer);
    gl.bindBuffer(gl.ARRAY_BUFFER, self.vertexBuffer);
    gl.enableVertexAttribArray(self.attribs.position);
    gl.enableVertexAttribArray(self.attribs.texCoord);
    gl.vertexAttribPointer(self.attribs.position, 2, gl.FLOAT, false, 20, 0);
    gl.vertexAttribPointer(self.attribs.texCoord, 3, gl.FLOAT, false, 20, 8);
    if (self.instanceExt) {
      if (positionDivisor != 0) {
        self.instanceExt.vertexAttribDivisorANGLE(self.attribs.position, 0);
      }
      if (texCoordDivisor != 0) {
        self.instanceExt.vertexAttribDivisorANGLE(self.attribs.texCoord, 0);
      }
    }
    gl.activeTexture(gl.TEXTURE0);
    gl.uniform1i(self.uniforms.diffuse, 0);
    gl.bindTexture(gl.TEXTURE_2D, self.renderTarget);
    gl.uniform4fv(self.uniforms.viewportOffsetScale, self.viewportOffsetScale);
    gl.drawElements(gl.TRIANGLES, self.indexCount, gl.UNSIGNED_SHORT, 0);
    if (self.cardboardUI) {
      self.cardboardUI.renderNoState();
    }
    self.realBindFramebuffer.call(self.gl, gl.FRAMEBUFFER, self.framebuffer);
    if (!self.ctxAttribs.preserveDrawingBuffer) {
      self.realClearColor.call(gl, 0, 0, 0, 0);
      gl.clear(gl.COLOR_BUFFER_BIT);
    }
    if (!self.dirtySubmitFrameBindings) {
      self.realBindFramebuffer.call(gl, gl.FRAMEBUFFER, self.lastBoundFramebuffer);
    }
    if (self.cullFace) {
      self.realEnable.call(gl, gl.CULL_FACE);
    }
    if (self.depthTest) {
      self.realEnable.call(gl, gl.DEPTH_TEST);
    }
    if (self.blend) {
      self.realEnable.call(gl, gl.BLEND);
    }
    if (self.scissorTest) {
      self.realEnable.call(gl, gl.SCISSOR_TEST);
    }
    if (self.stencilTest) {
      self.realEnable.call(gl, gl.STENCIL_TEST);
    }
    self.realColorMask.apply(gl, self.colorMask);
    self.realViewport.apply(gl, self.viewport);
    if (self.ctxAttribs.alpha || !self.ctxAttribs.preserveDrawingBuffer) {
      self.realClearColor.apply(gl, self.clearColor);
    }
    if (self.instanceExt) {
      if (positionDivisor != 0) {
        self.instanceExt.vertexAttribDivisorANGLE(self.attribs.position, positionDivisor);
      }
      if (texCoordDivisor != 0) {
        self.instanceExt.vertexAttribDivisorANGLE(self.attribs.texCoord, texCoordDivisor);
      }
    }
  });
  if (isIOS()) {
    var canvas = gl.canvas;
    if (canvas.width != self.bufferWidth || canvas.height != self.bufferHeight) {
      self.bufferWidth = canvas.width;
      self.bufferHeight = canvas.height;
      self.onResize();
    }
  }
};
CardboardDistorter.prototype.updateDeviceInfo = function (deviceInfo) {
  var gl = this.gl;
  var self = this;
  var glState = [gl.ARRAY_BUFFER_BINDING, gl.ELEMENT_ARRAY_BUFFER_BINDING];
  glPreserveState(gl, glState, function (gl) {
    var vertices = self.computeMeshVertices_(self.meshWidth, self.meshHeight, deviceInfo);
    gl.bindBuffer(gl.ARRAY_BUFFER, self.vertexBuffer);
    gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW);
    if (!self.indexCount) {
      var indices = self.computeMeshIndices_(self.meshWidth, self.meshHeight);
      gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, self.indexBuffer);
      gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
      self.indexCount = indices.length;
    }
  });
};
CardboardDistorter.prototype.computeMeshVertices_ = function (width, height, deviceInfo) {
  var vertices = new Float32Array(2 * width * height * 5);
  var lensFrustum = deviceInfo.getLeftEyeVisibleTanAngles();
  var noLensFrustum = deviceInfo.getLeftEyeNoLensTanAngles();
  var viewport = deviceInfo.getLeftEyeVisibleScreenRect(noLensFrustum);
  var vidx = 0;
  for (var e = 0; e < 2; e++) {
    for (var j = 0; j < height; j++) {
      for (var i = 0; i < width; i++, vidx++) {
        var u = i / (width - 1);
        var v = j / (height - 1);
        var s = u;
        var t = v;
        var x = lerp(lensFrustum[0], lensFrustum[2], u);
        var y = lerp(lensFrustum[3], lensFrustum[1], v);
        var d = Math.sqrt(x * x + y * y);
        var r = deviceInfo.distortion.distortInverse(d);
        var p = x * r / d;
        var q = y * r / d;
        u = (p - noLensFrustum[0]) / (noLensFrustum[2] - noLensFrustum[0]);
        v = (q - noLensFrustum[3]) / (noLensFrustum[1] - noLensFrustum[3]);
        u = (viewport.x + u * viewport.width - 0.5) * 2.0;
        v = (viewport.y + v * viewport.height - 0.5) * 2.0;
        vertices[vidx * 5 + 0] = u;
        vertices[vidx * 5 + 1] = v;
        vertices[vidx * 5 + 2] = s;
        vertices[vidx * 5 + 3] = t;
        vertices[vidx * 5 + 4] = e;
      }
    }
    var w = lensFrustum[2] - lensFrustum[0];
    lensFrustum[0] = -(w + lensFrustum[0]);
    lensFrustum[2] = w - lensFrustum[2];
    w = noLensFrustum[2] - noLensFrustum[0];
    noLensFrustum[0] = -(w + noLensFrustum[0]);
    noLensFrustum[2] = w - noLensFrustum[2];
    viewport.x = 1 - (viewport.x + viewport.width);
  }
  return vertices;
};
CardboardDistorter.prototype.computeMeshIndices_ = function (width, height) {
  var indices = new Uint16Array(2 * (width - 1) * (height - 1) * 6);
  var halfwidth = width / 2;
  var halfheight = height / 2;
  var vidx = 0;
  var iidx = 0;
  for (var e = 0; e < 2; e++) {
    for (var j = 0; j < height; j++) {
      for (var i = 0; i < width; i++, vidx++) {
        if (i == 0 || j == 0) continue;
        if (i <= halfwidth == j <= halfheight) {
          indices[iidx++] = vidx;
          indices[iidx++] = vidx - width - 1;
          indices[iidx++] = vidx - width;
          indices[iidx++] = vidx - width - 1;
          indices[iidx++] = vidx;
          indices[iidx++] = vidx - 1;
        } else {
          indices[iidx++] = vidx - 1;
          indices[iidx++] = vidx - width;
          indices[iidx++] = vidx;
          indices[iidx++] = vidx - width;
          indices[iidx++] = vidx - 1;
          indices[iidx++] = vidx - width - 1;
        }
      }
    }
  }
  return indices;
};
CardboardDistorter.prototype.getOwnPropertyDescriptor_ = function (proto, attrName) {
  var descriptor = Object.getOwnPropertyDescriptor(proto, attrName);
  if (descriptor.get === undefined || descriptor.set === undefined) {
    descriptor.configurable = true;
    descriptor.enumerable = true;
    descriptor.get = function () {
      return this.getAttribute(attrName);
    };
    descriptor.set = function (val) {
      this.setAttribute(attrName, val);
    };
  }
  return descriptor;
};

var uiVS = ['attribute vec2 position;', 'uniform mat4 projectionMat;', 'void main() {', '  gl_Position = projectionMat * vec4( position, -1.0, 1.0 );', '}'].join('\n');
var uiFS = ['precision mediump float;', 'uniform vec4 color;', 'void main() {', '  gl_FragColor = color;', '}'].join('\n');
var DEG2RAD = Math.PI / 180.0;
var kAnglePerGearSection = 60;
var kOuterRimEndAngle = 12;
var kInnerRimBeginAngle = 20;
var kOuterRadius = 1;
var kMiddleRadius = 0.75;
var kInnerRadius = 0.3125;
var kCenterLineThicknessDp = 4;
var kButtonWidthDp = 28;
var kTouchSlopFactor = 1.5;
function CardboardUI(gl) {
  this.gl = gl;
  this.attribs = {
    position: 0
  };
  this.program = linkProgram(gl, uiVS, uiFS, this.attribs);
  this.uniforms = getProgramUniforms(gl, this.program);
  this.vertexBuffer = gl.createBuffer();
  this.gearOffset = 0;
  this.gearVertexCount = 0;
  this.arrowOffset = 0;
  this.arrowVertexCount = 0;
  this.projMat = new Float32Array(16);
  this.listener = null;
  this.onResize();
}
CardboardUI.prototype.destroy = function () {
  var gl = this.gl;
  if (this.listener) {
    gl.canvas.removeEventListener('click', this.listener, false);
  }
  gl.deleteProgram(this.program);
  gl.deleteBuffer(this.vertexBuffer);
};
CardboardUI.prototype.listen = function (optionsCallback, backCallback) {
  var canvas = this.gl.canvas;
  this.listener = function (event) {
    var midline = canvas.clientWidth / 2;
    var buttonSize = kButtonWidthDp * kTouchSlopFactor;
    if (event.clientX > midline - buttonSize && event.clientX < midline + buttonSize && event.clientY > canvas.clientHeight - buttonSize) {
      optionsCallback(event);
    }
    else if (event.clientX < buttonSize && event.clientY < buttonSize) {
        backCallback(event);
      }
  };
  canvas.addEventListener('click', this.listener, false);
};
CardboardUI.prototype.onResize = function () {
  var gl = this.gl;
  var self = this;
  var glState = [gl.ARRAY_BUFFER_BINDING];
  glPreserveState(gl, glState, function (gl) {
    var vertices = [];
    var midline = gl.drawingBufferWidth / 2;
    var physicalPixels = Math.max(screen.width, screen.height) * window.devicePixelRatio;
    var scalingRatio = gl.drawingBufferWidth / physicalPixels;
    var dps = scalingRatio * window.devicePixelRatio;
    var lineWidth = kCenterLineThicknessDp * dps / 2;
    var buttonSize = kButtonWidthDp * kTouchSlopFactor * dps;
    var buttonScale = kButtonWidthDp * dps / 2;
    var buttonBorder = (kButtonWidthDp * kTouchSlopFactor - kButtonWidthDp) * dps;
    vertices.push(midline - lineWidth, buttonSize);
    vertices.push(midline - lineWidth, gl.drawingBufferHeight);
    vertices.push(midline + lineWidth, buttonSize);
    vertices.push(midline + lineWidth, gl.drawingBufferHeight);
    self.gearOffset = vertices.length / 2;
    function addGearSegment(theta, r) {
      var angle = (90 - theta) * DEG2RAD;
      var x = Math.cos(angle);
      var y = Math.sin(angle);
      vertices.push(kInnerRadius * x * buttonScale + midline, kInnerRadius * y * buttonScale + buttonScale);
      vertices.push(r * x * buttonScale + midline, r * y * buttonScale + buttonScale);
    }
    for (var i = 0; i <= 6; i++) {
      var segmentTheta = i * kAnglePerGearSection;
      addGearSegment(segmentTheta, kOuterRadius);
      addGearSegment(segmentTheta + kOuterRimEndAngle, kOuterRadius);
      addGearSegment(segmentTheta + kInnerRimBeginAngle, kMiddleRadius);
      addGearSegment(segmentTheta + (kAnglePerGearSection - kInnerRimBeginAngle), kMiddleRadius);
      addGearSegment(segmentTheta + (kAnglePerGearSection - kOuterRimEndAngle), kOuterRadius);
    }
    self.gearVertexCount = vertices.length / 2 - self.gearOffset;
    self.arrowOffset = vertices.length / 2;
    function addArrowVertex(x, y) {
      vertices.push(buttonBorder + x, gl.drawingBufferHeight - buttonBorder - y);
    }
    var angledLineWidth = lineWidth / Math.sin(45 * DEG2RAD);
    addArrowVertex(0, buttonScale);
    addArrowVertex(buttonScale, 0);
    addArrowVertex(buttonScale + angledLineWidth, angledLineWidth);
    addArrowVertex(angledLineWidth, buttonScale + angledLineWidth);
    addArrowVertex(angledLineWidth, buttonScale - angledLineWidth);
    addArrowVertex(0, buttonScale);
    addArrowVertex(buttonScale, buttonScale * 2);
    addArrowVertex(buttonScale + angledLineWidth, buttonScale * 2 - angledLineWidth);
    addArrowVertex(angledLineWidth, buttonScale - angledLineWidth);
    addArrowVertex(0, buttonScale);
    addArrowVertex(angledLineWidth, buttonScale - lineWidth);
    addArrowVertex(kButtonWidthDp * dps, buttonScale - lineWidth);
    addArrowVertex(angledLineWidth, buttonScale + lineWidth);
    addArrowVertex(kButtonWidthDp * dps, buttonScale + lineWidth);
    self.arrowVertexCount = vertices.length / 2 - self.arrowOffset;
    gl.bindBuffer(gl.ARRAY_BUFFER, self.vertexBuffer);
    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
  });
};
CardboardUI.prototype.render = function () {
  var gl = this.gl;
  var self = this;
  var glState = [gl.CULL_FACE, gl.DEPTH_TEST, gl.BLEND, gl.SCISSOR_TEST, gl.STENCIL_TEST, gl.COLOR_WRITEMASK, gl.VIEWPORT, gl.CURRENT_PROGRAM, gl.ARRAY_BUFFER_BINDING];
  glPreserveState(gl, glState, function (gl) {
    gl.disable(gl.CULL_FACE);
    gl.disable(gl.DEPTH_TEST);
    gl.disable(gl.BLEND);
    gl.disable(gl.SCISSOR_TEST);
    gl.disable(gl.STENCIL_TEST);
    gl.colorMask(true, true, true, true);
    gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);
    self.renderNoState();
  });
};
CardboardUI.prototype.renderNoState = function () {
  var gl = this.gl;
  gl.useProgram(this.program);
  gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer);
  gl.enableVertexAttribArray(this.attribs.position);
  gl.vertexAttribPointer(this.attribs.position, 2, gl.FLOAT, false, 8, 0);
  gl.uniform4f(this.uniforms.color, 1.0, 1.0, 1.0, 1.0);
  orthoMatrix(this.projMat, 0, gl.drawingBufferWidth, 0, gl.drawingBufferHeight, 0.1, 1024.0);
  gl.uniformMatrix4fv(this.uniforms.projectionMat, false, this.projMat);
  gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
  gl.drawArrays(gl.TRIANGLE_STRIP, this.gearOffset, this.gearVertexCount);
  gl.drawArrays(gl.TRIANGLE_STRIP, this.arrowOffset, this.arrowVertexCount);
};

function Distortion(coefficients) {
  this.coefficients = coefficients;
}
Distortion.prototype.distortInverse = function (radius) {
  var r0 = 0;
  var r1 = 1;
  var dr0 = radius - this.distort(r0);
  while (Math.abs(r1 - r0) > 0.0001             ) {
    var dr1 = radius - this.distort(r1);
    var r2 = r1 - dr1 * ((r1 - r0) / (dr1 - dr0));
    r0 = r1;
    r1 = r2;
    dr0 = dr1;
  }
  return r1;
};
Distortion.prototype.distort = function (radius) {
  var r2 = radius * radius;
  var ret = 0;
  for (var i = 0; i < this.coefficients.length; i++) {
    ret = r2 * (ret + this.coefficients[i]);
  }
  return (ret + 1) * radius;
};

var degToRad = Math.PI / 180;
var radToDeg = 180 / Math.PI;

var Vector3 = function Vector3(x, y, z) {
  this.x = x || 0;
  this.y = y || 0;
  this.z = z || 0;
};
Vector3.prototype = {
  constructor: Vector3,
  set: function set(x, y, z) {
    this.x = x;
    this.y = y;
    this.z = z;
    return this;
  },
  copy: function copy(v) {
    this.x = v.x;
    this.y = v.y;
    this.z = v.z;
    return this;
  },
  length: function length() {
    return Math.sqrt(this.x * this.x + this.y * this.y + this.z * this.z);
  },
  normalize: function normalize() {
    var scalar = this.length();
    if (scalar !== 0) {
      var invScalar = 1 / scalar;
      this.multiplyScalar(invScalar);
    } else {
      this.x = 0;
      this.y = 0;
      this.z = 0;
    }
    return this;
  },
  multiplyScalar: function multiplyScalar(scalar) {
    this.x *= scalar;
    this.y *= scalar;
    this.z *= scalar;
  },
  applyQuaternion: function applyQuaternion(q) {
    var x = this.x;
    var y = this.y;
    var z = this.z;
    var qx = q.x;
    var qy = q.y;
    var qz = q.z;
    var qw = q.w;
    var ix = qw * x + qy * z - qz * y;
    var iy = qw * y + qz * x - qx * z;
    var iz = qw * z + qx * y - qy * x;
    var iw = -qx * x - qy * y - qz * z;
    this.x = ix * qw + iw * -qx + iy * -qz - iz * -qy;
    this.y = iy * qw + iw * -qy + iz * -qx - ix * -qz;
    this.z = iz * qw + iw * -qz + ix * -qy - iy * -qx;
    return this;
  },
  dot: function dot(v) {
    return this.x * v.x + this.y * v.y + this.z * v.z;
  },
  crossVectors: function crossVectors(a, b) {
    var ax = a.x,
        ay = a.y,
        az = a.z;
    var bx = b.x,
        by = b.y,
        bz = b.z;
    this.x = ay * bz - az * by;
    this.y = az * bx - ax * bz;
    this.z = ax * by - ay * bx;
    return this;
  }
};
var Quaternion = function Quaternion(x, y, z, w) {
  this.x = x || 0;
  this.y = y || 0;
  this.z = z || 0;
  this.w = w !== undefined ? w : 1;
};
Quaternion.prototype = {
  constructor: Quaternion,
  set: function set(x, y, z, w) {
    this.x = x;
    this.y = y;
    this.z = z;
    this.w = w;
    return this;
  },
  copy: function copy(quaternion) {
    this.x = quaternion.x;
    this.y = quaternion.y;
    this.z = quaternion.z;
    this.w = quaternion.w;
    return this;
  },
  setFromEulerXYZ: function setFromEulerXYZ(x, y, z) {
    var c1 = Math.cos(x / 2);
    var c2 = Math.cos(y / 2);
    var c3 = Math.cos(z / 2);
    var s1 = Math.sin(x / 2);
    var s2 = Math.sin(y / 2);
    var s3 = Math.sin(z / 2);
    this.x = s1 * c2 * c3 + c1 * s2 * s3;
    this.y = c1 * s2 * c3 - s1 * c2 * s3;
    this.z = c1 * c2 * s3 + s1 * s2 * c3;
    this.w = c1 * c2 * c3 - s1 * s2 * s3;
    return this;
  },
  setFromEulerYXZ: function setFromEulerYXZ(x, y, z) {
    var c1 = Math.cos(x / 2);
    var c2 = Math.cos(y / 2);
    var c3 = Math.cos(z / 2);
    var s1 = Math.sin(x / 2);
    var s2 = Math.sin(y / 2);
    var s3 = Math.sin(z / 2);
    this.x = s1 * c2 * c3 + c1 * s2 * s3;
    this.y = c1 * s2 * c3 - s1 * c2 * s3;
    this.z = c1 * c2 * s3 - s1 * s2 * c3;
    this.w = c1 * c2 * c3 + s1 * s2 * s3;
    return this;
  },
  setFromAxisAngle: function setFromAxisAngle(axis, angle) {
    var halfAngle = angle / 2,
        s = Math.sin(halfAngle);
    this.x = axis.x * s;
    this.y = axis.y * s;
    this.z = axis.z * s;
    this.w = Math.cos(halfAngle);
    return this;
  },
  multiply: function multiply(q) {
    return this.multiplyQuaternions(this, q);
  },
  multiplyQuaternions: function multiplyQuaternions(a, b) {
    var qax = a.x,
        qay = a.y,
        qaz = a.z,
        qaw = a.w;
    var qbx = b.x,
        qby = b.y,
        qbz = b.z,
        qbw = b.w;
    this.x = qax * qbw + qaw * qbx + qay * qbz - qaz * qby;
    this.y = qay * qbw + qaw * qby + qaz * qbx - qax * qbz;
    this.z = qaz * qbw + qaw * qbz + qax * qby - qay * qbx;
    this.w = qaw * qbw - qax * qbx - qay * qby - qaz * qbz;
    return this;
  },
  inverse: function inverse() {
    this.x *= -1;
    this.y *= -1;
    this.z *= -1;
    this.normalize();
    return this;
  },
  normalize: function normalize() {
    var l = Math.sqrt(this.x * this.x + this.y * this.y + this.z * this.z + this.w * this.w);
    if (l === 0) {
      this.x = 0;
      this.y = 0;
      this.z = 0;
      this.w = 1;
    } else {
      l = 1 / l;
      this.x = this.x * l;
      this.y = this.y * l;
      this.z = this.z * l;
      this.w = this.w * l;
    }
    return this;
  },
  slerp: function slerp(qb, t) {
    if (t === 0) return this;
    if (t === 1) return this.copy(qb);
    var x = this.x,
        y = this.y,
        z = this.z,
        w = this.w;
    var cosHalfTheta = w * qb.w + x * qb.x + y * qb.y + z * qb.z;
    if (cosHalfTheta < 0) {
      this.w = -qb.w;
      this.x = -qb.x;
      this.y = -qb.y;
      this.z = -qb.z;
      cosHalfTheta = -cosHalfTheta;
    } else {
      this.copy(qb);
    }
    if (cosHalfTheta >= 1.0) {
      this.w = w;
      this.x = x;
      this.y = y;
      this.z = z;
      return this;
    }
    var halfTheta = Math.acos(cosHalfTheta);
    var sinHalfTheta = Math.sqrt(1.0 - cosHalfTheta * cosHalfTheta);
    if (Math.abs(sinHalfTheta) < 0.001) {
      this.w = 0.5 * (w + this.w);
      this.x = 0.5 * (x + this.x);
      this.y = 0.5 * (y + this.y);
      this.z = 0.5 * (z + this.z);
      return this;
    }
    var ratioA = Math.sin((1 - t) * halfTheta) / sinHalfTheta,
        ratioB = Math.sin(t * halfTheta) / sinHalfTheta;
    this.w = w * ratioA + this.w * ratioB;
    this.x = x * ratioA + this.x * ratioB;
    this.y = y * ratioA + this.y * ratioB;
    this.z = z * ratioA + this.z * ratioB;
    return this;
  },
  setFromUnitVectors: function () {
    var v1, r;
    var EPS = 0.000001;
    return function (vFrom, vTo) {
      if (v1 === undefined) v1 = new Vector3();
      r = vFrom.dot(vTo) + 1;
      if (r < EPS) {
        r = 0;
        if (Math.abs(vFrom.x) > Math.abs(vFrom.z)) {
          v1.set(-vFrom.y, vFrom.x, 0);
        } else {
          v1.set(0, -vFrom.z, vFrom.y);
        }
      } else {
        v1.crossVectors(vFrom, vTo);
      }
      this.x = v1.x;
      this.y = v1.y;
      this.z = v1.z;
      this.w = r;
      this.normalize();
      return this;
    };
  }()
};

function Device(params) {
  this.width = params.width || getScreenWidth();
  this.height = params.height || getScreenHeight();
  this.widthMeters = params.widthMeters;
  this.heightMeters = params.heightMeters;
  this.bevelMeters = params.bevelMeters;
}
var DEFAULT_ANDROID = new Device({
  widthMeters: 0.110,
  heightMeters: 0.062,
  bevelMeters: 0.004
});
var DEFAULT_IOS = new Device({
  widthMeters: 0.1038,
  heightMeters: 0.0584,
  bevelMeters: 0.004
});
var Viewers = {
  CardboardV1: new CardboardViewer({
    id: 'CardboardV1',
    label: 'Cardboard I/O 2014',
    fov: 40,
    interLensDistance: 0.060,
    baselineLensDistance: 0.035,
    screenLensDistance: 0.042,
    distortionCoefficients: [0.441, 0.156],
    inverseCoefficients: [-0.4410035, 0.42756155, -0.4804439, 0.5460139, -0.58821183, 0.5733938, -0.48303202, 0.33299083, -0.17573841, 0.0651772, -0.01488963, 0.001559834]
  }),
  CardboardV2: new CardboardViewer({
    id: 'CardboardV2',
    label: 'Cardboard I/O 2015',
    fov: 60,
    interLensDistance: 0.064,
    baselineLensDistance: 0.035,
    screenLensDistance: 0.039,
    distortionCoefficients: [0.34, 0.55],
    inverseCoefficients: [-0.33836704, -0.18162185, 0.862655, -1.2462051, 1.0560602, -0.58208317, 0.21609078, -0.05444823, 0.009177956, -9.904169E-4, 6.183535E-5, -1.6981803E-6]
  })
};
function DeviceInfo(deviceParams, additionalViewers) {
  this.viewer = Viewers.CardboardV2;
  this.updateDeviceParams(deviceParams);
  this.distortion = new Distortion(this.viewer.distortionCoefficients);
  for (var i = 0; i < additionalViewers.length; i++) {
    var viewer = additionalViewers[i];
    Viewers[viewer.id] = new CardboardViewer(viewer);
  }
}
DeviceInfo.prototype.updateDeviceParams = function (deviceParams) {
  this.device = this.determineDevice_(deviceParams) || this.device;
};
DeviceInfo.prototype.getDevice = function () {
  return this.device;
};
DeviceInfo.prototype.setViewer = function (viewer) {
  this.viewer = viewer;
  this.distortion = new Distortion(this.viewer.distortionCoefficients);
};
DeviceInfo.prototype.determineDevice_ = function (deviceParams) {
  if (!deviceParams) {
    if (isIOS()) {
      console.warn('Using fallback iOS device measurements.');
      return DEFAULT_IOS;
    } else {
      console.warn('Using fallback Android device measurements.');
      return DEFAULT_ANDROID;
    }
  }
  var METERS_PER_INCH = 0.0254;
  var metersPerPixelX = METERS_PER_INCH / deviceParams.xdpi;
  var metersPerPixelY = METERS_PER_INCH / deviceParams.ydpi;
  var width = getScreenWidth();
  var height = getScreenHeight();
  return new Device({
    widthMeters: metersPerPixelX * width,
    heightMeters: metersPerPixelY * height,
    bevelMeters: deviceParams.bevelMm * 0.001
  });
};
DeviceInfo.prototype.getDistortedFieldOfViewLeftEye = function () {
  var viewer = this.viewer;
  var device = this.device;
  var distortion = this.distortion;
  var eyeToScreenDistance = viewer.screenLensDistance;
  var outerDist = (device.widthMeters - viewer.interLensDistance) / 2;
  var innerDist = viewer.interLensDistance / 2;
  var bottomDist = viewer.baselineLensDistance - device.bevelMeters;
  var topDist = device.heightMeters - bottomDist;
  var outerAngle = radToDeg * Math.atan(distortion.distort(outerDist / eyeToScreenDistance));
  var innerAngle = radToDeg * Math.atan(distortion.distort(innerDist / eyeToScreenDistance));
  var bottomAngle = radToDeg * Math.atan(distortion.distort(bottomDist / eyeToScreenDistance));
  var topAngle = radToDeg * Math.atan(distortion.distort(topDist / eyeToScreenDistance));
  return {
    leftDegrees: Math.min(outerAngle, viewer.fov),
    rightDegrees: Math.min(innerAngle, viewer.fov),
    downDegrees: Math.min(bottomAngle, viewer.fov),
    upDegrees: Math.min(topAngle, viewer.fov)
  };
};
DeviceInfo.prototype.getLeftEyeVisibleTanAngles = function () {
  var viewer = this.viewer;
  var device = this.device;
  var distortion = this.distortion;
  var fovLeft = Math.tan(-degToRad * viewer.fov);
  var fovTop = Math.tan(degToRad * viewer.fov);
  var fovRight = Math.tan(degToRad * viewer.fov);
  var fovBottom = Math.tan(-degToRad * viewer.fov);
  var halfWidth = device.widthMeters / 4;
  var halfHeight = device.heightMeters / 2;
  var verticalLensOffset = viewer.baselineLensDistance - device.bevelMeters - halfHeight;
  var centerX = viewer.interLensDistance / 2 - halfWidth;
  var centerY = -verticalLensOffset;
  var centerZ = viewer.screenLensDistance;
  var screenLeft = distortion.distort((centerX - halfWidth) / centerZ);
  var screenTop = distortion.distort((centerY + halfHeight) / centerZ);
  var screenRight = distortion.distort((centerX + halfWidth) / centerZ);
  var screenBottom = distortion.distort((centerY - halfHeight) / centerZ);
  var result = new Float32Array(4);
  result[0] = Math.max(fovLeft, screenLeft);
  result[1] = Math.min(fovTop, screenTop);
  result[2] = Math.min(fovRight, screenRight);
  result[3] = Math.max(fovBottom, screenBottom);
  return result;
};
DeviceInfo.prototype.getLeftEyeNoLensTanAngles = function () {
  var viewer = this.viewer;
  var device = this.device;
  var distortion = this.distortion;
  var result = new Float32Array(4);
  var fovLeft = distortion.distortInverse(Math.tan(-degToRad * viewer.fov));
  var fovTop = distortion.distortInverse(Math.tan(degToRad * viewer.fov));
  var fovRight = distortion.distortInverse(Math.tan(degToRad * viewer.fov));
  var fovBottom = distortion.distortInverse(Math.tan(-degToRad * viewer.fov));
  var halfWidth = device.widthMeters / 4;
  var halfHeight = device.heightMeters / 2;
  var verticalLensOffset = viewer.baselineLensDistance - device.bevelMeters - halfHeight;
  var centerX = viewer.interLensDistance / 2 - halfWidth;
  var centerY = -verticalLensOffset;
  var centerZ = viewer.screenLensDistance;
  var screenLeft = (centerX - halfWidth) / centerZ;
  var screenTop = (centerY + halfHeight) / centerZ;
  var screenRight = (centerX + halfWidth) / centerZ;
  var screenBottom = (centerY - halfHeight) / centerZ;
  result[0] = Math.max(fovLeft, screenLeft);
  result[1] = Math.min(fovTop, screenTop);
  result[2] = Math.min(fovRight, screenRight);
  result[3] = Math.max(fovBottom, screenBottom);
  return result;
};
DeviceInfo.prototype.getLeftEyeVisibleScreenRect = function (undistortedFrustum) {
  var viewer = this.viewer;
  var device = this.device;
  var dist = viewer.screenLensDistance;
  var eyeX = (device.widthMeters - viewer.interLensDistance) / 2;
  var eyeY = viewer.baselineLensDistance - device.bevelMeters;
  var left = (undistortedFrustum[0] * dist + eyeX) / device.widthMeters;
  var top = (undistortedFrustum[1] * dist + eyeY) / device.heightMeters;
  var right = (undistortedFrustum[2] * dist + eyeX) / device.widthMeters;
  var bottom = (undistortedFrustum[3] * dist + eyeY) / device.heightMeters;
  return {
    x: left,
    y: bottom,
    width: right - left,
    height: top - bottom
  };
};
DeviceInfo.prototype.getFieldOfViewLeftEye = function (opt_isUndistorted) {
  return opt_isUndistorted ? this.getUndistortedFieldOfViewLeftEye() : this.getDistortedFieldOfViewLeftEye();
};
DeviceInfo.prototype.getFieldOfViewRightEye = function (opt_isUndistorted) {
  var fov = this.getFieldOfViewLeftEye(opt_isUndistorted);
  return {
    leftDegrees: fov.rightDegrees,
    rightDegrees: fov.leftDegrees,
    upDegrees: fov.upDegrees,
    downDegrees: fov.downDegrees
  };
};
DeviceInfo.prototype.getUndistortedFieldOfViewLeftEye = function () {
  var p = this.getUndistortedParams_();
  return {
    leftDegrees: radToDeg * Math.atan(p.outerDist),
    rightDegrees: radToDeg * Math.atan(p.innerDist),
    downDegrees: radToDeg * Math.atan(p.bottomDist),
    upDegrees: radToDeg * Math.atan(p.topDist)
  };
};
DeviceInfo.prototype.getUndistortedViewportLeftEye = function () {
  var p = this.getUndistortedParams_();
  var viewer = this.viewer;
  var device = this.device;
  var eyeToScreenDistance = viewer.screenLensDistance;
  var screenWidth = device.widthMeters / eyeToScreenDistance;
  var screenHeight = device.heightMeters / eyeToScreenDistance;
  var xPxPerTanAngle = device.width / screenWidth;
  var yPxPerTanAngle = device.height / screenHeight;
  var x = Math.round((p.eyePosX - p.outerDist) * xPxPerTanAngle);
  var y = Math.round((p.eyePosY - p.bottomDist) * yPxPerTanAngle);
  return {
    x: x,
    y: y,
    width: Math.round((p.eyePosX + p.innerDist) * xPxPerTanAngle) - x,
    height: Math.round((p.eyePosY + p.topDist) * yPxPerTanAngle) - y
  };
};
DeviceInfo.prototype.getUndistortedParams_ = function () {
  var viewer = this.viewer;
  var device = this.device;
  var distortion = this.distortion;
  var eyeToScreenDistance = viewer.screenLensDistance;
  var halfLensDistance = viewer.interLensDistance / 2 / eyeToScreenDistance;
  var screenWidth = device.widthMeters / eyeToScreenDistance;
  var screenHeight = device.heightMeters / eyeToScreenDistance;
  var eyePosX = screenWidth / 2 - halfLensDistance;
  var eyePosY = (viewer.baselineLensDistance - device.bevelMeters) / eyeToScreenDistance;
  var maxFov = viewer.fov;
  var viewerMax = distortion.distortInverse(Math.tan(degToRad * maxFov));
  var outerDist = Math.min(eyePosX, viewerMax);
  var innerDist = Math.min(halfLensDistance, viewerMax);
  var bottomDist = Math.min(eyePosY, viewerMax);
  var topDist = Math.min(screenHeight - eyePosY, viewerMax);
  return {
    outerDist: outerDist,
    innerDist: innerDist,
    topDist: topDist,
    bottomDist: bottomDist,
    eyePosX: eyePosX,
    eyePosY: eyePosY
  };
};
function CardboardViewer(params) {
  this.id = params.id;
  this.label = params.label;
  this.fov = params.fov;
  this.interLensDistance = params.interLensDistance;
  this.baselineLensDistance = params.baselineLensDistance;
  this.screenLensDistance = params.screenLensDistance;
  this.distortionCoefficients = params.distortionCoefficients;
  this.inverseCoefficients = params.inverseCoefficients;
}
DeviceInfo.Viewers = Viewers;

var format = 1;
var last_updated = "2019-11-09T17:36:14Z";
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Nexus/*"},{"ua":"Galaxy Nexus"}],"dpi":[315.3,314.2],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"samsung/*/SM-N910H/*"},{"ua":"SM-N910H"}],"dpi":[515.1,518],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"samsung/*/SM-N910C/*"},{"ua":"SM-N910C"}],"dpi":[515.2,520.2],"bw":3,"ac":500},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G130M/*"},{"ua":"SM-G130M"}],"dpi":[165.9,164.8],"bw":3,"ac":500},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G928I/*"},{"ua":"SM-G928I"}],"dpi":[515.1,518.4],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G920F/*"},{"ua":"SM-G920F"}],"dpi":580.6,"bw":3,"ac":500},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G920P/*"},{"ua":"SM-G920P"}],"dpi":[522.5,577],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G925F/*"},{"ua":"SM-G925F"}],"dpi":580.6,"bw":3,"ac":500},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G925V/*"},{"ua":"SM-G925V"}],"dpi":[522.5,576.6],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G930F/*"},{"ua":"SM-G930F"}],"dpi":576.6,"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G935F/*"},{"ua":"SM-G935F"}],"dpi":533,"bw":3,"ac":500},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G950F/*"},{"ua":"SM-G950F"}],"dpi":[562.707,565.293],"bw":3,"ac":500},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G955U/*"},{"ua":"SM-G955U"}],"dpi":[522.514,525.762],"bw":3,"ac":500},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G955F/*"},{"ua":"SM-G955F"}],"dpi":[522.514,525.762],"bw":3,"ac":500},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G960F/*"},{"ua":"SM-G960F"}],"dpi":[569.575,571.5],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G9600/*"},{"ua":"SM-G9600"}],"dpi":[569.575,571.5],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G960T/*"},{"ua":"SM-G960T"}],"dpi":[569.575,571.5],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G960N/*"},{"ua":"SM-G960N"}],"dpi":[569.575,571.5],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G960U/*"},{"ua":"SM-G960U"}],"dpi":[569.575,571.5],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G9608/*"},{"ua":"SM-G9608"}],"dpi":[569.575,571.5],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G960FD/*"},{"ua":"SM-G960FD"}],"dpi":[569.575,571.5],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G960W/*"},{"ua":"SM-G960W"}],"dpi":[569.575,571.5],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G965F/*"},{"ua":"SM-G965F"}],"dpi":529,"bw":2,"ac":1000},{"type":"android","rules":[{"mdmh":"Sony/*/C6903/*"},{"ua":"C6903"}],"dpi":[442.5,443.3],"bw":3,"ac":500},{"type":"android","rules":[{"mdmh":"Sony/*/D6653/*"},{"ua":"D6653"}],"dpi":[428.6,427.6],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"Sony/*/E6653/*"},{"ua":"E6653"}],"dpi":[428.6,425.7],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"Sony/*/E6853/*"},{"ua":"E6853"}],"dpi":[403.4,401.9],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"Sony/*/SGP321/*"},{"ua":"SGP321"}],"dpi":[224.7,224.1],"bw":3,"ac":500},{"type":"android","rules":[{"mdmh":"TCT/*/ALCATEL ONE TOUCH Fierce/*"},{"ua":"ALCATEL ONE TOUCH Fierce"}],"dpi":[240,247.5],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"THL/*/thl 5000/*"},{"ua":"thl 5000"}],"dpi":[480,443.3],"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"Fly/*/IQ4412/*"},{"ua":"IQ4412"}],"dpi":307.9,"bw":3,"ac":1000},{"type":"android","rules":[{"mdmh":"ZTE/*/ZTE Blade L2/*"},{"ua":"ZTE Blade L2"}],"dpi":240,"bw":3,"ac":500},{"type":"android","rules":[{"mdmh":"BENEVE/*/VR518/*"},{"ua":"VR518"}],"dpi":480,"bw":3,"ac":500},{"type":"ios","rules":[{"res":[640,960]}],"dpi":[325.1,328.4],"bw":4,"ac":1000},{"type":"ios","rules":[{"res":[640,1136]}],"dpi":[317.1,320.2],"bw":3,"ac":1000},{"type":"ios","rules":[{"res":[750,1334]}],"dpi":326.4,"bw":4,"ac":1000},{"type":"ios","rules":[{"res":[1242,2208]}],"dpi":[453.6,458.4],"bw":4,"ac":1000},{"type":"ios","rules":[{"res":[1125,2001]}],"dpi":[410.9,415.4],"bw":4,"ac":1000},{"type":"ios","rules":[{"res":[1125,2436]}],"dpi":458,"bw":4,"ac":1000},{"type":"android","rules":[{"mdmh":"Huawei/*/EML-L29/*"},{"ua":"EML-L29"}],"dpi":428,"bw":3.45,"ac":500},{"type":"android","rules":[{"mdmh":"Nokia/*/Nokia 7.1/*"},{"ua":"Nokia 7.1"}],"dpi":[432,431.9],"bw":3,"ac":500},{"type":"ios","rules":[{"res":[1242,2688]}],"dpi":458,"bw":4,"ac":1000},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G570M/*"},{"ua":"SM-G570M"}],"dpi":320,"bw":3.684,"ac":1000},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G970F/*"},{"ua":"SM-G970F"}],"dpi":438,"bw":2.281,"ac":500},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G973F/*"},{"ua":"SM-G973F"}],"dpi":550,"bw":2.002,"ac":500},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G975F/*"},{"ua":"SM-G975F"}],"dpi":522,"bw":2.054,"ac":500},{"type":"android","rules":[{"mdmh":"samsung/*/SM-G977F/*"},{"ua":"SM-G977F"}],"dpi":505,"bw":2.334,"ac":500},{"type":"ios","rules":[{"res":[828,1792]}],"dpi":326,"bw":5,"ac":500}];
var DPDB_CACHE = {
	format: format,
	last_updated: last_updated,
	devices: devices
};

function Dpdb(url, onDeviceParamsUpdated) {
  this.dpdb = DPDB_CACHE;
  this.recalculateDeviceParams_();
  if (url) {
    this.onDeviceParamsUpdated = onDeviceParamsUpdated;
    var xhr = new XMLHttpRequest();
    var obj = this;
    xhr.open('GET', url, true);
    xhr.addEventListener('load', function () {
      obj.loading = false;
      if (xhr.status >= 200 && xhr.status <= 299) {
        obj.dpdb = JSON.parse(xhr.response);
        obj.recalculateDeviceParams_();
      } else {
        console.error('Error loading online DPDB!');
      }
    });
    xhr.send();
  }
}
Dpdb.prototype.getDeviceParams = function () {
  return this.deviceParams;
};
Dpdb.prototype.recalculateDeviceParams_ = function () {
  var newDeviceParams = this.calcDeviceParams_();
  if (newDeviceParams) {
    this.deviceParams = newDeviceParams;
    if (this.onDeviceParamsUpdated) {
      this.onDeviceParamsUpdated(this.deviceParams);
    }
  } else {
    console.error('Failed to recalculate device parameters.');
  }
};
Dpdb.prototype.calcDeviceParams_ = function () {
  var db = this.dpdb;
  if (!db) {
    console.error('DPDB not available.');
    return null;
  }
  if (db.format != 1) {
    console.error('DPDB has unexpected format version.');
    return null;
  }
  if (!db.devices || !db.devices.length) {
    console.error('DPDB does not have a devices section.');
    return null;
  }
  var userAgent = navigator.userAgent || navigator.vendor || window.opera;
  var width = getScreenWidth();
  var height = getScreenHeight();
  if (!db.devices) {
    console.error('DPDB has no devices section.');
    return null;
  }
  for (var i = 0; i < db.devices.length; i++) {
    var device = db.devices[i];
    if (!device.rules) {
      console.warn('Device[' + i + '] has no rules section.');
      continue;
    }
    if (device.type != 'ios' && device.type != 'android') {
      console.warn('Device[' + i + '] has invalid type.');
      continue;
    }
    if (isIOS() != (device.type == 'ios')) continue;
    var matched = false;
    for (var j = 0; j < device.rules.length; j++) {
      var rule = device.rules[j];
      if (this.ruleMatches_(rule, userAgent, width, height)) {
        matched = true;
        break;
      }
    }
    if (!matched) continue;
    var xdpi = device.dpi[0] || device.dpi;
    var ydpi = device.dpi[1] || device.dpi;
    return new DeviceParams({ xdpi: xdpi, ydpi: ydpi, bevelMm: device.bw });
  }
  console.warn('No DPDB device match.');
  return null;
};
Dpdb.prototype.ruleMatches_ = function (rule, ua, screenWidth, screenHeight) {
  if (!rule.ua && !rule.res) return false;
  if (rule.ua && rule.ua.substring(0, 2) === 'SM') rule.ua = rule.ua.substring(0, 7);
  if (rule.ua && ua.indexOf(rule.ua) < 0) return false;
  if (rule.res) {
    if (!rule.res[0] || !rule.res[1]) return false;
    var resX = rule.res[0];
    var resY = rule.res[1];
    if (Math.min(screenWidth, screenHeight) != Math.min(resX, resY) || Math.max(screenWidth, screenHeight) != Math.max(resX, resY)) {
      return false;
    }
  }
  return true;
};
function DeviceParams(params) {
  this.xdpi = params.xdpi;
  this.ydpi = params.ydpi;
  this.bevelMm = params.bevelMm;
}

function SensorSample(sample, timestampS) {
  this.set(sample, timestampS);
}
SensorSample.prototype.set = function (sample, timestampS) {
  this.sample = sample;
  this.timestampS = timestampS;
};
SensorSample.prototype.copy = function (sensorSample) {
  this.set(sensorSample.sample, sensorSample.timestampS);
};

function ComplementaryFilter(kFilter, isDebug) {
  this.kFilter = kFilter;
  this.isDebug = isDebug;
  this.currentAccelMeasurement = new SensorSample();
  this.currentGyroMeasurement = new SensorSample();
  this.previousGyroMeasurement = new SensorSample();
  if (isIOS()) {
    this.filterQ = new Quaternion(-1, 0, 0, 1);
  } else {
    this.filterQ = new Quaternion(1, 0, 0, 1);
  }
  this.previousFilterQ = new Quaternion();
  this.previousFilterQ.copy(this.filterQ);
  this.accelQ = new Quaternion();
  this.isOrientationInitialized = false;
  this.estimatedGravity = new Vector3();
  this.measuredGravity = new Vector3();
  this.gyroIntegralQ = new Quaternion();
}
ComplementaryFilter.prototype.addAccelMeasurement = function (vector, timestampS) {
  this.currentAccelMeasurement.set(vector, timestampS);
};
ComplementaryFilter.prototype.addGyroMeasurement = function (vector, timestampS) {
  this.currentGyroMeasurement.set(vector, timestampS);
  var deltaT = timestampS - this.previousGyroMeasurement.timestampS;
  if (isTimestampDeltaValid(deltaT)) {
    this.run_();
  }
  this.previousGyroMeasurement.copy(this.currentGyroMeasurement);
};
ComplementaryFilter.prototype.run_ = function () {
  if (!this.isOrientationInitialized) {
    this.accelQ = this.accelToQuaternion_(this.currentAccelMeasurement.sample);
    this.previousFilterQ.copy(this.accelQ);
    this.isOrientationInitialized = true;
    return;
  }
  var deltaT = this.currentGyroMeasurement.timestampS - this.previousGyroMeasurement.timestampS;
  var gyroDeltaQ = this.gyroToQuaternionDelta_(this.currentGyroMeasurement.sample, deltaT);
  this.gyroIntegralQ.multiply(gyroDeltaQ);
  this.filterQ.copy(this.previousFilterQ);
  this.filterQ.multiply(gyroDeltaQ);
  var invFilterQ = new Quaternion();
  invFilterQ.copy(this.filterQ);
  invFilterQ.inverse();
  this.estimatedGravity.set(0, 0, -1);
  this.estimatedGravity.applyQuaternion(invFilterQ);
  this.estimatedGravity.normalize();
  this.measuredGravity.copy(this.currentAccelMeasurement.sample);
  this.measuredGravity.normalize();
  var deltaQ = new Quaternion();
  deltaQ.setFromUnitVectors(this.estimatedGravity, this.measuredGravity);
  deltaQ.inverse();
  if (this.isDebug) {
    console.log('Delta: %d deg, G_est: (%s, %s, %s), G_meas: (%s, %s, %s)', radToDeg * getQuaternionAngle(deltaQ), this.estimatedGravity.x.toFixed(1), this.estimatedGravity.y.toFixed(1), this.estimatedGravity.z.toFixed(1), this.measuredGravity.x.toFixed(1), this.measuredGravity.y.toFixed(1), this.measuredGravity.z.toFixed(1));
  }
  var targetQ = new Quaternion();
  targetQ.copy(this.filterQ);
  targetQ.multiply(deltaQ);
  this.filterQ.slerp(targetQ, 1 - this.kFilter);
  this.previousFilterQ.copy(this.filterQ);
};
ComplementaryFilter.prototype.getOrientation = function () {
  return this.filterQ;
};
ComplementaryFilter.prototype.accelToQuaternion_ = function (accel) {
  var normAccel = new Vector3();
  normAccel.copy(accel);
  normAccel.normalize();
  var quat = new Quaternion();
  quat.setFromUnitVectors(new Vector3(0, 0, -1), normAccel);
  quat.inverse();
  return quat;
};
ComplementaryFilter.prototype.gyroToQuaternionDelta_ = function (gyro, dt) {
  var quat = new Quaternion();
  var axis = new Vector3();
  axis.copy(gyro);
  axis.normalize();
  quat.setFromAxisAngle(axis, gyro.length() * dt);
  return quat;
};

function PosePredictor(predictionTimeS, isDebug) {
  this.predictionTimeS = predictionTimeS;
  this.isDebug = isDebug;
  this.previousQ = new Quaternion();
  this.previousTimestampS = null;
  this.deltaQ = new Quaternion();
  this.outQ = new Quaternion();
}
PosePredictor.prototype.getPrediction = function (currentQ, gyro, timestampS) {
  if (!this.previousTimestampS) {
    this.previousQ.copy(currentQ);
    this.previousTimestampS = timestampS;
    return currentQ;
  }
  var axis = new Vector3();
  axis.copy(gyro);
  axis.normalize();
  var angularSpeed = gyro.length();
  if (angularSpeed < degToRad * 20) {
    if (this.isDebug) {
      console.log('Moving slowly, at %s deg/s: no prediction', (radToDeg * angularSpeed).toFixed(1));
    }
    this.outQ.copy(currentQ);
    this.previousQ.copy(currentQ);
    return this.outQ;
  }
  var predictAngle = angularSpeed * this.predictionTimeS;
  this.deltaQ.setFromAxisAngle(axis, predictAngle);
  this.outQ.copy(this.previousQ);
  this.outQ.multiply(this.deltaQ);
  this.previousQ.copy(currentQ);
  this.previousTimestampS = timestampS;
  return this.outQ;
};

function FusionPoseSensor(kFilter, predictionTime, yawOnly, isDebug) {
  this.yawOnly = yawOnly;
  this.accelerometer = new Vector3();
  this.gyroscope = new Vector3();
  this.filter = new ComplementaryFilter(kFilter, isDebug);
  this.posePredictor = new PosePredictor(predictionTime, isDebug);
  this.isFirefoxAndroid = isFirefoxAndroid();
  this.isIOS = isIOS();
  var chromeVersion = getChromeVersion();
  this.isDeviceMotionInRadians = !this.isIOS && chromeVersion && chromeVersion < 66;
  this.isWithoutDeviceMotion = isChromeWithoutDeviceMotion() || isSafariWithoutDeviceMotion();
  this.filterToWorldQ = new Quaternion();
  if (isIOS()) {
    this.filterToWorldQ.setFromAxisAngle(new Vector3(1, 0, 0), Math.PI / 2);
  } else {
    this.filterToWorldQ.setFromAxisAngle(new Vector3(1, 0, 0), -Math.PI / 2);
  }
  this.inverseWorldToScreenQ = new Quaternion();
  this.worldToScreenQ = new Quaternion();
  this.originalPoseAdjustQ = new Quaternion();
  this.originalPoseAdjustQ.setFromAxisAngle(new Vector3(0, 0, 1), -window.orientation * Math.PI / 180);
  this.setScreenTransform_();
  if (isLandscapeMode()) {
    this.filterToWorldQ.multiply(this.inverseWorldToScreenQ);
  }
  this.resetQ = new Quaternion();
  this.orientationOut_ = new Float32Array(4);
  this.start();
}
FusionPoseSensor.prototype.getPosition = function () {
  return null;
};
FusionPoseSensor.prototype.getOrientation = function () {
  var orientation = void 0;
  if (this.isWithoutDeviceMotion && this._deviceOrientationQ) {
    this.deviceOrientationFixQ = this.deviceOrientationFixQ || function () {
      var z = new Quaternion().setFromAxisAngle(new Vector3(0, 0, -1), 0);
      var y = new Quaternion();
      if (window.orientation === -90) {
        y.setFromAxisAngle(new Vector3(0, 1, 0), Math.PI / -2);
      } else {
        y.setFromAxisAngle(new Vector3(0, 1, 0), Math.PI / 2);
      }
      return z.multiply(y);
    }();
    this.deviceOrientationFilterToWorldQ = this.deviceOrientationFilterToWorldQ || function () {
      var q = new Quaternion();
      q.setFromAxisAngle(new Vector3(1, 0, 0), -Math.PI / 2);
      return q;
    }();
    orientation = this._deviceOrientationQ;
    var out = new Quaternion();
    out.copy(orientation);
    out.multiply(this.deviceOrientationFilterToWorldQ);
    out.multiply(this.resetQ);
    out.multiply(this.worldToScreenQ);
    out.multiplyQuaternions(this.deviceOrientationFixQ, out);
    if (this.yawOnly) {
      out.x = 0;
      out.z = 0;
      out.normalize();
    }
    this.orientationOut_[0] = out.x;
    this.orientationOut_[1] = out.y;
    this.orientationOut_[2] = out.z;
    this.orientationOut_[3] = out.w;
    return this.orientationOut_;
  } else {
    var filterOrientation = this.filter.getOrientation();
    orientation = this.posePredictor.getPrediction(filterOrientation, this.gyroscope, this.previousTimestampS);
  }
  var out = new Quaternion();
  out.copy(this.filterToWorldQ);
  out.multiply(this.resetQ);
  out.multiply(orientation);
  out.multiply(this.worldToScreenQ);
  if (this.yawOnly) {
    out.x = 0;
    out.z = 0;
    out.normalize();
  }
  this.orientationOut_[0] = out.x;
  this.orientationOut_[1] = out.y;
  this.orientationOut_[2] = out.z;
  this.orientationOut_[3] = out.w;
  return this.orientationOut_;
};
FusionPoseSensor.prototype.resetPose = function () {
  this.resetQ.copy(this.filter.getOrientation());
  this.resetQ.x = 0;
  this.resetQ.y = 0;
  this.resetQ.z *= -1;
  this.resetQ.normalize();
  if (isLandscapeMode()) {
    this.resetQ.multiply(this.inverseWorldToScreenQ);
  }
  this.resetQ.multiply(this.originalPoseAdjustQ);
};
FusionPoseSensor.prototype.onDeviceOrientation_ = function (e) {
  this._deviceOrientationQ = this._deviceOrientationQ || new Quaternion();
  var alpha = e.alpha,
      beta = e.beta,
      gamma = e.gamma;
  alpha = (alpha || 0) * Math.PI / 180;
  beta = (beta || 0) * Math.PI / 180;
  gamma = (gamma || 0) * Math.PI / 180;
  this._deviceOrientationQ.setFromEulerYXZ(beta, alpha, -gamma);
};
FusionPoseSensor.prototype.onDeviceMotion_ = function (deviceMotion) {
  this.updateDeviceMotion_(deviceMotion);
};
FusionPoseSensor.prototype.updateDeviceMotion_ = function (deviceMotion) {
  var accGravity = deviceMotion.accelerationIncludingGravity;
  var rotRate = deviceMotion.rotationRate;
  var timestampS = deviceMotion.timeStamp / 1000;
  var deltaS = timestampS - this.previousTimestampS;
  if (deltaS < 0) {
    warnOnce('fusion-pose-sensor:invalid:non-monotonic', 'Invalid timestamps detected: non-monotonic timestamp from devicemotion');
    this.previousTimestampS = timestampS;
    return;
  } else if (deltaS <= MIN_TIMESTEP || deltaS > MAX_TIMESTEP) {
    warnOnce('fusion-pose-sensor:invalid:outside-threshold', 'Invalid timestamps detected: Timestamp from devicemotion outside expected range.');
    this.previousTimestampS = timestampS;
    return;
  }
  this.accelerometer.set(-accGravity.x, -accGravity.y, -accGravity.z);
  if (rotRate) {
    if (isR7()) {
      this.gyroscope.set(-rotRate.beta, rotRate.alpha, rotRate.gamma);
    } else {
      this.gyroscope.set(rotRate.alpha, rotRate.beta, rotRate.gamma);
    }
    if (!this.isDeviceMotionInRadians) {
      this.gyroscope.multiplyScalar(Math.PI / 180);
    }
    this.filter.addGyroMeasurement(this.gyroscope, timestampS);
  }
  this.filter.addAccelMeasurement(this.accelerometer, timestampS);
  this.previousTimestampS = timestampS;
};
FusionPoseSensor.prototype.onOrientationChange_ = function (screenOrientation) {
  this.setScreenTransform_();
};
FusionPoseSensor.prototype.onMessage_ = function (event) {
  var message = event.data;
  if (!message || !message.type) {
    return;
  }
  var type = message.type.toLowerCase();
  if (type !== 'devicemotion') {
    return;
  }
  this.updateDeviceMotion_(message.deviceMotionEvent);
};
FusionPoseSensor.prototype.setScreenTransform_ = function () {
  this.worldToScreenQ.set(0, 0, 0, 1);
  switch (window.orientation) {
    case 0:
      break;
    case 90:
      this.worldToScreenQ.setFromAxisAngle(new Vector3(0, 0, 1), -Math.PI / 2);
      break;
    case -90:
      this.worldToScreenQ.setFromAxisAngle(new Vector3(0, 0, 1), Math.PI / 2);
      break;
    case 180:
      break;
  }
  this.inverseWorldToScreenQ.copy(this.worldToScreenQ);
  this.inverseWorldToScreenQ.inverse();
};
FusionPoseSensor.prototype.start = function () {
  this.onDeviceMotionCallback_ = this.onDeviceMotion_.bind(this);
  this.onOrientationChangeCallback_ = this.onOrientationChange_.bind(this);
  this.onMessageCallback_ = this.onMessage_.bind(this);
  this.onDeviceOrientationCallback_ = this.onDeviceOrientation_.bind(this);
  if (isIOS() && isInsideCrossOriginIFrame()) {
    window.addEventListener('message', this.onMessageCallback_);
  }
  window.addEventListener('orientationchange', this.onOrientationChangeCallback_);
  if (this.isWithoutDeviceMotion) {
    window.addEventListener('deviceorientation', this.onDeviceOrientationCallback_);
  } else {
    window.addEventListener('devicemotion', this.onDeviceMotionCallback_);
  }
};
FusionPoseSensor.prototype.stop = function () {
  window.removeEventListener('devicemotion', this.onDeviceMotionCallback_);
  window.removeEventListener('deviceorientation', this.onDeviceOrientationCallback_);
  window.removeEventListener('orientationchange', this.onOrientationChangeCallback_);
  window.removeEventListener('message', this.onMessageCallback_);
};

var SENSOR_FREQUENCY = 60;
var X_AXIS = new Vector3(1, 0, 0);
var Z_AXIS = new Vector3(0, 0, 1);
var SENSOR_TO_VR = new Quaternion();
SENSOR_TO_VR.setFromAxisAngle(X_AXIS, -Math.PI / 2);
SENSOR_TO_VR.multiply(new Quaternion().setFromAxisAngle(Z_AXIS, Math.PI / 2));
var PoseSensor = function () {
  function PoseSensor(config) {
    classCallCheck(this, PoseSensor);
    this.config = config;
    this.sensor = null;
    this.fusionSensor = null;
    this._out = new Float32Array(4);
    this.api = null;
    this.errors = [];
    this._sensorQ = new Quaternion();
    this._outQ = new Quaternion();
    this._onSensorRead = this._onSensorRead.bind(this);
    this._onSensorError = this._onSensorError.bind(this);
    this.init();
  }
  createClass(PoseSensor, [{
    key: 'init',
    value: function init() {
      var sensor = null;
      try {
        sensor = new RelativeOrientationSensor({
          frequency: SENSOR_FREQUENCY,
          referenceFrame: 'screen'
        });
        sensor.addEventListener('error', this._onSensorError);
      } catch (error) {
        this.errors.push(error);
        if (error.name === 'SecurityError') {
          console.error('Cannot construct sensors due to the Feature Policy');
          console.warn('Attempting to fall back using "devicemotion"; however this will ' + 'fail in the future without correct permissions.');
          this.useDeviceMotion();
        } else if (error.name === 'ReferenceError') {
          this.useDeviceMotion();
        } else {
          console.error(error);
        }
      }
      if (sensor) {
        this.api = 'sensor';
        this.sensor = sensor;
        this.sensor.addEventListener('reading', this._onSensorRead);
        this.sensor.start();
      }
    }
  }, {
    key: 'useDeviceMotion',
    value: function useDeviceMotion() {
      this.api = 'devicemotion';
      this.fusionSensor = new FusionPoseSensor(this.config.K_FILTER, this.config.PREDICTION_TIME_S, this.config.YAW_ONLY, this.config.DEBUG);
      if (this.sensor) {
        this.sensor.removeEventListener('reading', this._onSensorRead);
        this.sensor.removeEventListener('error', this._onSensorError);
        this.sensor = null;
      }
    }
  }, {
    key: 'getOrientation',
    value: function getOrientation() {
      if (this.fusionSensor) {
        return this.fusionSensor.getOrientation();
      }
      if (!this.sensor || !this.sensor.quaternion) {
        this._out[0] = this._out[1] = this._out[2] = 0;
        this._out[3] = 1;
        return this._out;
      }
      var q = this.sensor.quaternion;
      this._sensorQ.set(q[0], q[1], q[2], q[3]);
      var out = this._outQ;
      out.copy(SENSOR_TO_VR);
      out.multiply(this._sensorQ);
      if (this.config.YAW_ONLY) {
        out.x = out.z = 0;
        out.normalize();
      }
      this._out[0] = out.x;
      this._out[1] = out.y;
      this._out[2] = out.z;
      this._out[3] = out.w;
      return this._out;
    }
  }, {
    key: '_onSensorError',
    value: function _onSensorError(event) {
      this.errors.push(event.error);
      if (event.error.name === 'NotAllowedError') {
        console.error('Permission to access sensor was denied');
      } else if (event.error.name === 'NotReadableError') {
        console.error('Sensor could not be read');
      } else {
        console.error(event.error);
      }
      this.useDeviceMotion();
    }
  }, {
    key: '_onSensorRead',
    value: function _onSensorRead() {}
  }]);
  return PoseSensor;
}();

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function RotateInstructions() {
  this.loadIcon_();
  var overlay = document.createElement('div');
  var s = overlay.style;
  s.position = 'fixed';
  s.top = 0;
  s.right = 0;
  s.bottom = 0;
  s.left = 0;
  s.backgroundColor = 'gray';
  s.fontFamily = 'sans-serif';
  s.zIndex = 1000000;
  var img = document.createElement('img');
  img.src = this.icon;
  var s = img.style;
  s.marginLeft = '25%';
  s.marginTop = '25%';
  s.width = '50%';
  overlay.appendChild(img);
  var text = document.createElement('div');
  var s = text.style;
  s.textAlign = 'center';
  s.fontSize = '16px';
  s.lineHeight = '24px';
  s.margin = '24px 25%';
  s.width = '50%';
  text.innerHTML = 'Place your phone into your Cardboard viewer.';
  overlay.appendChild(text);
  var snackbar = document.createElement('div');
  var s = snackbar.style;
  s.backgroundColor = '#CFD8DC';
  s.position = 'fixed';
  s.bottom = 0;
  s.width = '100%';
  s.height = '48px';
  s.padding = '14px 24px';
  s.boxSizing = 'border-box';
  s.color = '#656A6B';
  overlay.appendChild(snackbar);
  var snackbarText = document.createElement('div');
  snackbarText.style.float = 'left';
  snackbarText.innerHTML = 'No Cardboard viewer?';
  var snackbarButton = document.createElement('a');
  snackbarButton.href = 'https://www.google.com/get/cardboard/get-cardboard/';
  snackbarButton.innerHTML = 'get one';
  snackbarButton.target = '_blank';
  var s = snackbarButton.style;
  s.float = 'right';
  s.fontWeight = 600;
  s.textTransform = 'uppercase';
  s.borderLeft = '1px solid gray';
  s.paddingLeft = '24px';
  s.textDecoration = 'none';
  s.color = '#656A6B';
  snackbar.appendChild(snackbarText);
  snackbar.appendChild(snackbarButton);
  this.overlay = overlay;
  this.text = text;
  this.hide();
}
RotateInstructions.prototype.show = function (parent) {
  if (!parent && !this.overlay.parentElement) {
    document.body.appendChild(this.overlay);
  } else if (parent) {
    if (this.overlay.parentElement && this.overlay.parentElement != parent) this.overlay.parentElement.removeChild(this.overlay);
    parent.appendChild(this.overlay);
  }
  this.overlay.style.display = 'block';
  var img = this.overlay.querySelector('img');
  var s = img.style;
  if (isLandscapeMode()) {
    s.width = '20%';
    s.marginLeft = '40%';
    s.marginTop = '3%';
  } else {
    s.width = '50%';
    s.marginLeft = '25%';
    s.marginTop = '25%';
  }
};
RotateInstructions.prototype.hide = function () {
  this.overlay.style.display = 'none';
};
RotateInstructions.prototype.showTemporarily = function (ms, parent) {
  this.show(parent);
  this.timer = setTimeout(this.hide.bind(this), ms);
};
RotateInstructions.prototype.disableShowTemporarily = function () {
  clearTimeout(this.timer);
};
RotateInstructions.prototype.update = function () {
  this.disableShowTemporarily();
  if (!isLandscapeMode() && isMobile()) {
    this.show();
  } else {
    this.hide();
  }
};
RotateInstructions.prototype.loadIcon_ = function () {
  this.icon = dataUri('image/svg+xml', rotateInstructionsAsset);
};

var DEFAULT_VIEWER = 'CardboardV1';
var VIEWER_KEY = 'WEBVR_CARDBOARD_VIEWER';
var CLASS_NAME = 'webvr-polyfill-viewer-selector';
function ViewerSelector(defaultViewer) {
  try {
    this.selectedKey = localStorage.getItem(VIEWER_KEY);
  } catch (error) {
    console.error('Failed to load viewer profile: %s', error);
  }
  if (!this.selectedKey) {
    this.selectedKey = defaultViewer || DEFAULT_VIEWER;
  }
  this.dialog = this.createDialog_(DeviceInfo.Viewers);
  this.root = null;
  this.onChangeCallbacks_ = [];
}
ViewerSelector.prototype.show = function (root) {
  this.root = root;
  root.appendChild(this.dialog);
  var selected = this.dialog.querySelector('#' + this.selectedKey);
  selected.checked = true;
  this.dialog.style.display = 'block';
};
ViewerSelector.prototype.hide = function () {
  if (this.root && this.root.contains(this.dialog)) {
    this.root.removeChild(this.dialog);
  }
  this.dialog.style.display = 'none';
};
ViewerSelector.prototype.getCurrentViewer = function () {
  return DeviceInfo.Viewers[this.selectedKey];
};
ViewerSelector.prototype.getSelectedKey_ = function () {
  var input = this.dialog.querySelector('input[name=field]:checked');
  if (input) {
    return input.id;
  }
  return null;
};
ViewerSelector.prototype.onChange = function (cb) {
  this.onChangeCallbacks_.push(cb);
};
ViewerSelector.prototype.fireOnChange_ = function (viewer) {
  for (var i = 0; i < this.onChangeCallbacks_.length; i++) {
    this.onChangeCallbacks_[i](viewer);
  }
};
ViewerSelector.prototype.onSave_ = function () {
  this.selectedKey = this.getSelectedKey_();
  if (!this.selectedKey || !DeviceInfo.Viewers[this.selectedKey]) {
    console.error('ViewerSelector.onSave_: this should never happen!');
    return;
  }
  this.fireOnChange_(DeviceInfo.Viewers[this.selectedKey]);
  try {
    localStorage.setItem(VIEWER_KEY, this.selectedKey);
  } catch (error) {
    console.error('Failed to save viewer profile: %s', error);
  }
  this.hide();
};
ViewerSelector.prototype.createDialog_ = function (options) {
  var container = document.createElement('div');
  container.classList.add(CLASS_NAME);
  container.style.display = 'none';
  var overlay = document.createElement('div');
  var s = overlay.style;
  s.position = 'fixed';
  s.left = 0;
  s.top = 0;
  s.width = '100%';
  s.height = '100%';
  s.background = 'rgba(0, 0, 0, 0.3)';
  overlay.addEventListener('click', this.hide.bind(this));
  var width = 280;
  var dialog = document.createElement('div');
  var s = dialog.style;
  s.boxSizing = 'border-box';
  s.position = 'fixed';
  s.top = '24px';
  s.left = '50%';
  s.marginLeft = -width / 2 + 'px';
  s.width = width + 'px';
  s.padding = '24px';
  s.overflow = 'hidden';
  s.background = '#fafafa';
  s.fontFamily = "'Roboto', sans-serif";
  s.boxShadow = '0px 5px 20px #666';
  dialog.appendChild(this.createH1_('Select your viewer'));
  for (var id in options) {
    dialog.appendChild(this.createChoice_(id, options[id].label));
  }
  dialog.appendChild(this.createButton_('Save', this.onSave_.bind(this)));
  container.appendChild(overlay);
  container.appendChild(dialog);
  return container;
};
ViewerSelector.prototype.createH1_ = function (name) {
  var h1 = document.createElement('h1');
  var s = h1.style;
  s.color = 'black';
  s.fontSize = '20px';
  s.fontWeight = 'bold';
  s.marginTop = 0;
  s.marginBottom = '24px';
  h1.innerHTML = name;
  return h1;
};
ViewerSelector.prototype.createChoice_ = function (id, name) {
  var div = document.createElement('div');
  div.style.marginTop = '8px';
  div.style.color = 'black';
  var input = document.createElement('input');
  input.style.fontSize = '30px';
  input.setAttribute('id', id);
  input.setAttribute('type', 'radio');
  input.setAttribute('value', id);
  input.setAttribute('name', 'field');
  var label = document.createElement('label');
  label.style.marginLeft = '4px';
  label.setAttribute('for', id);
  label.innerHTML = name;
  div.appendChild(input);
  div.appendChild(label);
  return div;
};
ViewerSelector.prototype.createButton_ = function (label, onclick) {
  var button = document.createElement('button');
  button.innerHTML = label;
  var s = button.style;
  s.float = 'right';
  s.textTransform = 'uppercase';
  s.color = '#1094f7';
  s.fontSize = '14px';
  s.letterSpacing = 0;
  s.border = 0;
  s.background = 'none';
  s.marginTop = '16px';
  button.addEventListener('click', onclick);
  return button;
};

var commonjsGlobal = typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};



function unwrapExports (x) {
	return x && x.__esModule && Object.prototype.hasOwnProperty.call(x, 'default') ? x['default'] : x;
}

function createCommonjsModule(fn, module) {
	return module = { exports: {} }, fn(module, module.exports), module.exports;
}

var NoSleep = createCommonjsModule(function (module, exports) {
(function webpackUniversalModuleDefinition(root, factory) {
	module.exports = factory();
})(commonjsGlobal, function() {
return          (function(modules) {
         	var installedModules = {};
         	function __webpack_require__(moduleId) {
         		if(installedModules[moduleId]) {
         			return installedModules[moduleId].exports;
         		}
         		var module = installedModules[moduleId] = {
         			i: moduleId,
         			l: false,
         			exports: {}
         		};
         		modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
         		module.l = true;
         		return module.exports;
         	}
         	__webpack_require__.m = modules;
         	__webpack_require__.c = installedModules;
         	__webpack_require__.d = function(exports, name, getter) {
         		if(!__webpack_require__.o(exports, name)) {
         			Object.defineProperty(exports, name, {
         				configurable: false,
         				enumerable: true,
         				get: getter
         			});
         		}
         	};
         	__webpack_require__.n = function(module) {
         		var getter = module && module.__esModule ?
         			function getDefault() { return module['default']; } :
         			function getModuleExports() { return module; };
         		__webpack_require__.d(getter, 'a', getter);
         		return getter;
         	};
         	__webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };
         	__webpack_require__.p = "";
         	return __webpack_require__(__webpack_require__.s = 0);
         })
         ([
      (function(module, exports, __webpack_require__) {
"use strict";
var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
var mediaFile = __webpack_require__(1);
var oldIOS = typeof navigator !== 'undefined' && parseFloat(('' + (/CPU.*OS ([0-9_]{3,4})[0-9_]{0,1}|(CPU like).*AppleWebKit.*Mobile/i.exec(navigator.userAgent) || [0, ''])[1]).replace('undefined', '3_2').replace('_', '.').replace('_', '')) < 10 && !window.MSStream;
var NoSleep = function () {
  function NoSleep() {
    _classCallCheck(this, NoSleep);
    if (oldIOS) {
      this.noSleepTimer = null;
    } else {
      this.noSleepVideo = document.createElement('video');
      this.noSleepVideo.setAttribute('playsinline', '');
      this.noSleepVideo.setAttribute('src', mediaFile);
      this.noSleepVideo.addEventListener('timeupdate', function (e) {
        if (this.noSleepVideo.currentTime > 0.5) {
          this.noSleepVideo.currentTime = Math.random();
        }
      }.bind(this));
    }
  }
  _createClass(NoSleep, [{
    key: 'enable',
    value: function enable() {
      if (oldIOS) {
        this.disable();
        this.noSleepTimer = window.setInterval(function () {
          window.location.href = '/';
          window.setTimeout(window.stop, 0);
        }, 15000);
      } else {
        this.noSleepVideo.play();
      }
    }
  }, {
    key: 'disable',
    value: function disable() {
      if (oldIOS) {
        if (this.noSleepTimer) {
          window.clearInterval(this.noSleepTimer);
          this.noSleepTimer = null;
        }
      } else {
        this.noSleepVideo.pause();
      }
    }
  }]);
  return NoSleep;
}();

module.exports = NoSleep;
      }),
      (function(module, exports, __webpack_require__) {
"use strict";
module.exports = 'data:video/mp4;base64,[encoded data, 6456 characters]';
      })
         ]);
});
});
var NoSleep$1 = unwrapExports(NoSleep);

var nextDisplayId = 1000;
var defaultLeftBounds = [0, 0, 0.5, 1];
var defaultRightBounds = [0.5, 0, 0.5, 1];
var raf = window.requestAnimationFrame;
var caf = window.cancelAnimationFrame;
function VRFrameData() {
  this.leftProjectionMatrix = new Float32Array(16);
  this.leftViewMatrix = new Float32Array(16);
  this.rightProjectionMatrix = new Float32Array(16);
  this.rightViewMatrix = new Float32Array(16);
  this.pose = null;
}
function VRDisplayCapabilities(config) {
  Object.defineProperties(this, {
    hasPosition: {
      writable: false, enumerable: true, value: config.hasPosition
    },
    hasExternalDisplay: {
      writable: false, enumerable: true, value: config.hasExternalDisplay
    },
    canPresent: {
      writable: false, enumerable: true, value: config.canPresent
    },
    maxLayers: {
      writable: false, enumerable: true, value: config.maxLayers
    },
    hasOrientation: {
      enumerable: true, get: function get() {
        deprecateWarning('VRDisplayCapabilities.prototype.hasOrientation', 'VRDisplay.prototype.getFrameData');
        return config.hasOrientation;
      }
    }
  });
}
function VRDisplay(config) {
  config = config || {};
  var USE_WAKELOCK = 'wakelock' in config ? config.wakelock : true;
  this.isPolyfilled = true;
  this.displayId = nextDisplayId++;
  this.displayName = '';
  this.depthNear = 0.01;
  this.depthFar = 10000.0;
  this.isPresenting = false;
  Object.defineProperty(this, 'isConnected', {
    get: function get() {
      deprecateWarning('VRDisplay.prototype.isConnected', 'VRDisplayCapabilities.prototype.hasExternalDisplay');
      return false;
    }
  });
  this.capabilities = new VRDisplayCapabilities({
    hasPosition: false,
    hasOrientation: false,
    hasExternalDisplay: false,
    canPresent: false,
    maxLayers: 1
  });
  this.stageParameters = null;
  this.waitingForPresent_ = false;
  this.layer_ = null;
  this.originalParent_ = null;
  this.fullscreenElement_ = null;
  this.fullscreenWrapper_ = null;
  this.fullscreenElementCachedStyle_ = null;
  this.fullscreenEventTarget_ = null;
  this.fullscreenChangeHandler_ = null;
  this.fullscreenErrorHandler_ = null;
  if (USE_WAKELOCK && isMobile()) {
    this.wakelock_ = new NoSleep$1();
  }
}
VRDisplay.prototype.getFrameData = function (frameData) {
  return frameDataFromPose(frameData, this._getPose(), this);
};
VRDisplay.prototype.getPose = function () {
  deprecateWarning('VRDisplay.prototype.getPose', 'VRDisplay.prototype.getFrameData');
  return this._getPose();
};
VRDisplay.prototype.resetPose = function () {
  deprecateWarning('VRDisplay.prototype.resetPose');
  return this._resetPose();
};
VRDisplay.prototype.getImmediatePose = function () {
  deprecateWarning('VRDisplay.prototype.getImmediatePose', 'VRDisplay.prototype.getFrameData');
  return this._getPose();
};
VRDisplay.prototype.requestAnimationFrame = function (callback) {
  return raf(callback);
};
VRDisplay.prototype.cancelAnimationFrame = function (id) {
  return caf(id);
};
VRDisplay.prototype.wrapForFullscreen = function (element) {
  if (isIOS()) {
    return element;
  }
  if (!this.fullscreenWrapper_) {
    this.fullscreenWrapper_ = document.createElement('div');
    var cssProperties = ['height: ' + Math.min(screen.height, screen.width) + 'px !important', 'top: 0 !important', 'left: 0 !important', 'right: 0 !important', 'border: 0', 'margin: 0', 'padding: 0', 'z-index: 999999 !important', 'position: fixed'];
    this.fullscreenWrapper_.setAttribute('style', cssProperties.join('; ') + ';');
    this.fullscreenWrapper_.classList.add('webvr-polyfill-fullscreen-wrapper');
  }
  if (this.fullscreenElement_ == element) {
    return this.fullscreenWrapper_;
  }
  if (this.fullscreenElement_) {
    if (this.originalParent_) {
      this.originalParent_.appendChild(this.fullscreenElement_);
    } else {
      this.fullscreenElement_.parentElement.removeChild(this.fullscreenElement_);
    }
  }
  this.fullscreenElement_ = element;
  this.originalParent_ = element.parentElement;
  if (!this.originalParent_) {
    document.body.appendChild(element);
  }
  if (!this.fullscreenWrapper_.parentElement) {
    var parent = this.fullscreenElement_.parentElement;
    parent.insertBefore(this.fullscreenWrapper_, this.fullscreenElement_);
    parent.removeChild(this.fullscreenElement_);
  }
  this.fullscreenWrapper_.insertBefore(this.fullscreenElement_, this.fullscreenWrapper_.firstChild);
  this.fullscreenElementCachedStyle_ = this.fullscreenElement_.getAttribute('style');
  var self = this;
  function applyFullscreenElementStyle() {
    if (!self.fullscreenElement_) {
      return;
    }
    var cssProperties = ['position: absolute', 'top: 0', 'left: 0', 'width: ' + Math.max(screen.width, screen.height) + 'px', 'height: ' + Math.min(screen.height, screen.width) + 'px', 'border: 0', 'margin: 0', 'padding: 0'];
    self.fullscreenElement_.setAttribute('style', cssProperties.join('; ') + ';');
  }
  applyFullscreenElementStyle();
  return this.fullscreenWrapper_;
};
VRDisplay.prototype.removeFullscreenWrapper = function () {
  if (!this.fullscreenElement_) {
    return;
  }
  var element = this.fullscreenElement_;
  if (this.fullscreenElementCachedStyle_) {
    element.setAttribute('style', this.fullscreenElementCachedStyle_);
  } else {
    element.removeAttribute('style');
  }
  this.fullscreenElement_ = null;
  this.fullscreenElementCachedStyle_ = null;
  var parent = this.fullscreenWrapper_.parentElement;
  this.fullscreenWrapper_.removeChild(element);
  if (this.originalParent_ === parent) {
    parent.insertBefore(element, this.fullscreenWrapper_);
  }
  else if (this.originalParent_) {
      this.originalParent_.appendChild(element);
    }
  parent.removeChild(this.fullscreenWrapper_);
  return element;
};
VRDisplay.prototype.requestPresent = function (layers) {
  var wasPresenting = this.isPresenting;
  var self = this;
  if (!(layers instanceof Array)) {
    deprecateWarning('VRDisplay.prototype.requestPresent with non-array argument', 'an array of VRLayers as the first argument');
    layers = [layers];
  }
  return new Promise(function (resolve, reject) {
    if (!self.capabilities.canPresent) {
      reject(new Error('VRDisplay is not capable of presenting.'));
      return;
    }
    if (layers.length == 0 || layers.length > self.capabilities.maxLayers) {
      reject(new Error('Invalid number of layers.'));
      return;
    }
    var incomingLayer = layers[0];
    if (!incomingLayer.source) {
      resolve();
      return;
    }
    var leftBounds = incomingLayer.leftBounds || defaultLeftBounds;
    var rightBounds = incomingLayer.rightBounds || defaultRightBounds;
    if (wasPresenting) {
      var layer = self.layer_;
      if (layer.source !== incomingLayer.source) {
        layer.source = incomingLayer.source;
      }
      for (var i = 0; i < 4; i++) {
        layer.leftBounds[i] = leftBounds[i];
        layer.rightBounds[i] = rightBounds[i];
      }
      self.wrapForFullscreen(self.layer_.source);
      self.updatePresent_();
      resolve();
      return;
    }
    self.layer_ = {
      predistorted: incomingLayer.predistorted,
      source: incomingLayer.source,
      leftBounds: leftBounds.slice(0),
      rightBounds: rightBounds.slice(0)
    };
    self.waitingForPresent_ = false;
    if (self.layer_ && self.layer_.source) {
      var fullscreenElement = self.wrapForFullscreen(self.layer_.source);
      var onFullscreenChange = function onFullscreenChange() {
        var actualFullscreenElement = getFullscreenElement();
        self.isPresenting = fullscreenElement === actualFullscreenElement;
        if (self.isPresenting) {
          if (screen.orientation && screen.orientation.lock) {
            screen.orientation.lock('landscape-primary').catch(function (error) {
              console.error('screen.orientation.lock() failed due to', error.message);
            });
          }
          self.waitingForPresent_ = false;
          self.beginPresent_();
          resolve();
        } else {
          if (screen.orientation && screen.orientation.unlock) {
            screen.orientation.unlock();
          }
          self.removeFullscreenWrapper();
          self.disableWakeLock();
          self.endPresent_();
          self.removeFullscreenListeners_();
        }
        self.fireVRDisplayPresentChange_();
      };
      var onFullscreenError = function onFullscreenError() {
        if (!self.waitingForPresent_) {
          return;
        }
        self.removeFullscreenWrapper();
        self.removeFullscreenListeners_();
        self.disableWakeLock();
        self.waitingForPresent_ = false;
        self.isPresenting = false;
        reject(new Error('Unable to present.'));
      };
      self.addFullscreenListeners_(fullscreenElement, onFullscreenChange, onFullscreenError);
      if (requestFullscreen(fullscreenElement)) {
        self.enableWakeLock();
        self.waitingForPresent_ = true;
      } else if (isIOS() || isWebViewAndroid()) {
        self.enableWakeLock();
        self.isPresenting = true;
        self.beginPresent_();
        self.fireVRDisplayPresentChange_();
        resolve();
      }
    }
    if (!self.waitingForPresent_ && !isIOS()) {
      exitFullscreen();
      reject(new Error('Unable to present.'));
    }
  });
};
VRDisplay.prototype.exitPresent = function () {
  var wasPresenting = this.isPresenting;
  var self = this;
  this.isPresenting = false;
  this.layer_ = null;
  this.disableWakeLock();
  return new Promise(function (resolve, reject) {
    if (wasPresenting) {
      if (!exitFullscreen() && isIOS()) {
        self.endPresent_();
        self.fireVRDisplayPresentChange_();
      }
      if (isWebViewAndroid()) {
        self.removeFullscreenWrapper();
        self.removeFullscreenListeners_();
        self.endPresent_();
        self.fireVRDisplayPresentChange_();
      }
      resolve();
    } else {
      reject(new Error('Was not presenting to VRDisplay.'));
    }
  });
};
VRDisplay.prototype.getLayers = function () {
  if (this.layer_) {
    return [this.layer_];
  }
  return [];
};
VRDisplay.prototype.fireVRDisplayPresentChange_ = function () {
  var event = new CustomEvent('vrdisplaypresentchange', { detail: { display: this } });
  window.dispatchEvent(event);
};
VRDisplay.prototype.fireVRDisplayConnect_ = function () {
  var event = new CustomEvent('vrdisplayconnect', { detail: { display: this } });
  window.dispatchEvent(event);
};
VRDisplay.prototype.addFullscreenListeners_ = function (element, changeHandler, errorHandler) {
  this.removeFullscreenListeners_();
  this.fullscreenEventTarget_ = element;
  this.fullscreenChangeHandler_ = changeHandler;
  this.fullscreenErrorHandler_ = errorHandler;
  if (changeHandler) {
    if (document.fullscreenEnabled) {
      element.addEventListener('fullscreenchange', changeHandler, false);
    } else if (document.webkitFullscreenEnabled) {
      element.addEventListener('webkitfullscreenchange', changeHandler, false);
    } else if (document.mozFullScreenEnabled) {
      document.addEventListener('mozfullscreenchange', changeHandler, false);
    } else if (document.msFullscreenEnabled) {
      element.addEventListener('msfullscreenchange', changeHandler, false);
    }
  }
  if (errorHandler) {
    if (document.fullscreenEnabled) {
      element.addEventListener('fullscreenerror', errorHandler, false);
    } else if (document.webkitFullscreenEnabled) {
      element.addEventListener('webkitfullscreenerror', errorHandler, false);
    } else if (document.mozFullScreenEnabled) {
      document.addEventListener('mozfullscreenerror', errorHandler, false);
    } else if (document.msFullscreenEnabled) {
      element.addEventListener('msfullscreenerror', errorHandler, false);
    }
  }
};
VRDisplay.prototype.removeFullscreenListeners_ = function () {
  if (!this.fullscreenEventTarget_) return;
  var element = this.fullscreenEventTarget_;
  if (this.fullscreenChangeHandler_) {
    var changeHandler = this.fullscreenChangeHandler_;
    element.removeEventListener('fullscreenchange', changeHandler, false);
    element.removeEventListener('webkitfullscreenchange', changeHandler, false);
    document.removeEventListener('mozfullscreenchange', changeHandler, false);
    element.removeEventListener('msfullscreenchange', changeHandler, false);
  }
  if (this.fullscreenErrorHandler_) {
    var errorHandler = this.fullscreenErrorHandler_;
    element.removeEventListener('fullscreenerror', errorHandler, false);
    element.removeEventListener('webkitfullscreenerror', errorHandler, false);
    document.removeEventListener('mozfullscreenerror', errorHandler, false);
    element.removeEventListener('msfullscreenerror', errorHandler, false);
  }
  this.fullscreenEventTarget_ = null;
  this.fullscreenChangeHandler_ = null;
  this.fullscreenErrorHandler_ = null;
};
VRDisplay.prototype.enableWakeLock = function () {
  if (this.wakelock_) {
    this.wakelock_.enable();
  }
};
VRDisplay.prototype.disableWakeLock = function () {
  if (this.wakelock_) {
    this.wakelock_.disable();
  }
};
VRDisplay.prototype.beginPresent_ = function () {
};
VRDisplay.prototype.endPresent_ = function () {
};
VRDisplay.prototype.submitFrame = function (pose) {
};
VRDisplay.prototype.getEyeParameters = function (whichEye) {
  return null;
};

var config = {
  ADDITIONAL_VIEWERS: [],
  DEFAULT_VIEWER: '',
  MOBILE_WAKE_LOCK: true,
  DEBUG: false,
  DPDB_URL: 'https://dpdb.webvr.rocks/dpdb.json',
  K_FILTER: 0.98,
  PREDICTION_TIME_S: 0.040,
  CARDBOARD_UI_DISABLED: false,
  ROTATE_INSTRUCTIONS_DISABLED: false,
  YAW_ONLY: false,
  BUFFER_SCALE: 0.5,
  DIRTY_SUBMIT_FRAME_BINDINGS: false
};

var Eye = {
  LEFT: 'left',
  RIGHT: 'right'
};
function CardboardVRDisplay(config$$1) {
  var defaults = extend({}, config);
  config$$1 = extend(defaults, config$$1 || {});
  VRDisplay.call(this, {
    wakelock: config$$1.MOBILE_WAKE_LOCK
  });
  this.config = config$$1;
  this.displayName = 'Cardboard VRDisplay';
  this.capabilities = new VRDisplayCapabilities({
    hasPosition: false,
    hasOrientation: true,
    hasExternalDisplay: false,
    canPresent: true,
    maxLayers: 1
  });
  this.stageParameters = null;
  this.bufferScale_ = this.config.BUFFER_SCALE;
  this.poseSensor_ = new PoseSensor(this.config);
  this.distorter_ = null;
  this.cardboardUI_ = null;
  this.dpdb_ = new Dpdb(this.config.DPDB_URL, this.onDeviceParamsUpdated_.bind(this));
  this.deviceInfo_ = new DeviceInfo(this.dpdb_.getDeviceParams(), config$$1.ADDITIONAL_VIEWERS);
  this.viewerSelector_ = new ViewerSelector(config$$1.DEFAULT_VIEWER);
  this.viewerSelector_.onChange(this.onViewerChanged_.bind(this));
  this.deviceInfo_.setViewer(this.viewerSelector_.getCurrentViewer());
  if (!this.config.ROTATE_INSTRUCTIONS_DISABLED) {
    this.rotateInstructions_ = new RotateInstructions();
  }
  if (isIOS()) {
    window.addEventListener('resize', this.onResize_.bind(this));
  }
}
CardboardVRDisplay.prototype = Object.create(VRDisplay.prototype);
CardboardVRDisplay.prototype._getPose = function () {
  return {
    position: null,
    orientation: this.poseSensor_.getOrientation(),
    linearVelocity: null,
    linearAcceleration: null,
    angularVelocity: null,
    angularAcceleration: null
  };
};
CardboardVRDisplay.prototype._resetPose = function () {
  if (this.poseSensor_.resetPose) {
    this.poseSensor_.resetPose();
  }
};
CardboardVRDisplay.prototype._getFieldOfView = function (whichEye) {
  var fieldOfView;
  if (whichEye == Eye.LEFT) {
    fieldOfView = this.deviceInfo_.getFieldOfViewLeftEye();
  } else if (whichEye == Eye.RIGHT) {
    fieldOfView = this.deviceInfo_.getFieldOfViewRightEye();
  } else {
    console.error('Invalid eye provided: %s', whichEye);
    return null;
  }
  return fieldOfView;
};
CardboardVRDisplay.prototype._getEyeOffset = function (whichEye) {
  var offset;
  if (whichEye == Eye.LEFT) {
    offset = [-this.deviceInfo_.viewer.interLensDistance * 0.5, 0.0, 0.0];
  } else if (whichEye == Eye.RIGHT) {
    offset = [this.deviceInfo_.viewer.interLensDistance * 0.5, 0.0, 0.0];
  } else {
    console.error('Invalid eye provided: %s', whichEye);
    return null;
  }
  return offset;
};
CardboardVRDisplay.prototype.getEyeParameters = function (whichEye) {
  var offset = this._getEyeOffset(whichEye);
  var fieldOfView = this._getFieldOfView(whichEye);
  var eyeParams = {
    offset: offset,
    renderWidth: this.deviceInfo_.device.width * 0.5 * this.bufferScale_,
    renderHeight: this.deviceInfo_.device.height * this.bufferScale_
  };
  Object.defineProperty(eyeParams, 'fieldOfView', {
    enumerable: true,
    get: function get() {
      deprecateWarning('VRFieldOfView', 'VRFrameData\'s projection matrices');
      return fieldOfView;
    }
  });
  return eyeParams;
};
CardboardVRDisplay.prototype.onDeviceParamsUpdated_ = function (newParams) {
  if (this.config.DEBUG) {
    console.log('DPDB reported that device params were updated.');
  }
  this.deviceInfo_.updateDeviceParams(newParams);
  if (this.distorter_) {
    this.distorter_.updateDeviceInfo(this.deviceInfo_);
  }
};
CardboardVRDisplay.prototype.updateBounds_ = function () {
  if (this.layer_ && this.distorter_ && (this.layer_.leftBounds || this.layer_.rightBounds)) {
    this.distorter_.setTextureBounds(this.layer_.leftBounds, this.layer_.rightBounds);
  }
};
CardboardVRDisplay.prototype.beginPresent_ = function () {
  var gl = this.layer_.source.getContext('webgl');
  if (!gl) gl = this.layer_.source.getContext('experimental-webgl');
  if (!gl) gl = this.layer_.source.getContext('webgl2');
  if (!gl) return;
  if (this.layer_.predistorted) {
    if (!this.config.CARDBOARD_UI_DISABLED) {
      gl.canvas.width = getScreenWidth() * this.bufferScale_;
      gl.canvas.height = getScreenHeight() * this.bufferScale_;
      this.cardboardUI_ = new CardboardUI(gl);
    }
  } else {
    if (!this.config.CARDBOARD_UI_DISABLED) {
      this.cardboardUI_ = new CardboardUI(gl);
    }
    this.distorter_ = new CardboardDistorter(gl, this.cardboardUI_, this.config.BUFFER_SCALE, this.config.DIRTY_SUBMIT_FRAME_BINDINGS);
    this.distorter_.updateDeviceInfo(this.deviceInfo_);
  }
  if (this.cardboardUI_) {
    this.cardboardUI_.listen(function (e) {
      this.viewerSelector_.show(this.layer_.source.parentElement);
      e.stopPropagation();
      e.preventDefault();
    }.bind(this), function (e) {
      this.exitPresent();
      e.stopPropagation();
      e.preventDefault();
    }.bind(this));
  }
  if (this.rotateInstructions_) {
    if (isLandscapeMode() && isMobile()) {
      this.rotateInstructions_.showTemporarily(3000, this.layer_.source.parentElement);
    } else {
      this.rotateInstructions_.update();
    }
  }
  this.orientationHandler = this.onOrientationChange_.bind(this);
  window.addEventListener('orientationchange', this.orientationHandler);
  this.vrdisplaypresentchangeHandler = this.updateBounds_.bind(this);
  window.addEventListener('vrdisplaypresentchange', this.vrdisplaypresentchangeHandler);
  this.fireVRDisplayDeviceParamsChange_();
};
CardboardVRDisplay.prototype.endPresent_ = function () {
  if (this.distorter_) {
    this.distorter_.destroy();
    this.distorter_ = null;
  }
  if (this.cardboardUI_) {
    this.cardboardUI_.destroy();
    this.cardboardUI_ = null;
  }
  if (this.rotateInstructions_) {
    this.rotateInstructions_.hide();
  }
  this.viewerSelector_.hide();
  window.removeEventListener('orientationchange', this.orientationHandler);
  window.removeEventListener('vrdisplaypresentchange', this.vrdisplaypresentchangeHandler);
};
CardboardVRDisplay.prototype.updatePresent_ = function () {
  this.endPresent_();
  this.beginPresent_();
};
CardboardVRDisplay.prototype.submitFrame = function (pose) {
  if (this.distorter_) {
    this.updateBounds_();
    this.distorter_.submitFrame();
  } else if (this.cardboardUI_ && this.layer_) {
    var gl = this.layer_.source.getContext('webgl');
    if (!gl) gl = this.layer_.source.getContext('experimental-webgl');
    if (!gl) gl = this.layer_.source.getContext('webgl2');
    var canvas = gl.canvas;
    if (canvas.width != this.lastWidth || canvas.height != this.lastHeight) {
      this.cardboardUI_.onResize();
    }
    this.lastWidth = canvas.width;
    this.lastHeight = canvas.height;
    this.cardboardUI_.render();
  }
};
CardboardVRDisplay.prototype.onOrientationChange_ = function (e) {
  this.viewerSelector_.hide();
  if (this.rotateInstructions_) {
    this.rotateInstructions_.update();
  }
  this.onResize_();
};
CardboardVRDisplay.prototype.onResize_ = function (e) {
  if (this.layer_) {
    var gl = this.layer_.source.getContext('webgl');
    if (!gl) gl = this.layer_.source.getContext('experimental-webgl');
    if (!gl) gl = this.layer_.source.getContext('webgl2');
    var cssProperties = ['position: absolute', 'top: 0', 'left: 0',
    'width: 100vw', 'height: 100vh', 'border: 0', 'margin: 0',
    'padding: 0px', 'box-sizing: content-box'];
    gl.canvas.setAttribute('style', cssProperties.join('; ') + ';');
    safariCssSizeWorkaround(gl.canvas);
  }
};
CardboardVRDisplay.prototype.onViewerChanged_ = function (viewer) {
  this.deviceInfo_.setViewer(viewer);
  if (this.distorter_) {
    this.distorter_.updateDeviceInfo(this.deviceInfo_);
  }
  this.fireVRDisplayDeviceParamsChange_();
};
CardboardVRDisplay.prototype.fireVRDisplayDeviceParamsChange_ = function () {
  var event = new CustomEvent('vrdisplaydeviceparamschange', {
    detail: {
      vrdisplay: this,
      deviceInfo: this.deviceInfo_
    }
  });
  window.dispatchEvent(event);
};
CardboardVRDisplay.VRFrameData = VRFrameData;
CardboardVRDisplay.VRDisplay = VRDisplay;

return CardboardVRDisplay;

})));
