tofu.js/src/utils/Raf.js

a helper three.js library for building UC-AR

(function() {
  let lastTime = 0;
  const vendors = [ 'ms', 'moz', 'webkit', 'o' ];
  for (let x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
    window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
    window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] ||
            window[vendors[x] + 'CancelRequestAnimationFrame'];
  }

  if (!window.requestAnimationFrame) {
    window.requestAnimationFrame = function(callback) {
      const currTime = new Date().getTime();
      const timeToCall = Math.max(0, 16 - (currTime - lastTime));
      const id = window.setTimeout(function() {
        callback(currTime + timeToCall);
      }, timeToCall);
      lastTime = currTime + timeToCall;
      return id;
    };
  }

  if (!window.cancelAnimationFrame) {
    window.cancelAnimationFrame = function(id) {
      clearTimeout(id);
    };
  }

  window.RAF = window.requestAnimationFrame;
  window.CAF = window.cancelAnimationFrame;
})();