text: /**
   * @author mrdoob / http://mrdoob.com/
   */
  
  const Stats = function () {
  
  	var mode = 0;
  
  	var container = document.createElement( 'div' );
  	container.style.cssText = 'position:fixed;top:0;left:0;cursor:pointer;opacity:0.9;z-index:10000';
  	container.addEventListener( 'click', function ( event ) {
  
  		event.preventDefault();
  		showPanel( ++ mode % container.children.length );
  
  	}, false );
  
  	//
  
  	function addPanel( panel ) {
  
  		container.appendChild( panel.dom );
  		return panel;
  
  	}
  
  	function showPanel( id ) {
  
  		for ( var i = 0; i < container.children.length; i ++ ) {
  
  			container.children[ i ].style.display = i === id ? 'block' : 'none';
  
  		}
  
  		mode = id;
  
  	}
  
  	//
  
  	var beginTime = ( performance || Date ).now(), prevTime = beginTime, frames = 0;
  
  	var fpsPanel = addPanel( new Stats.Panel( 'FPS', '#0ff', '#002' ) );
  	var msPanel = addPanel( new Stats.Panel( 'MS', '#0f0', '#020' ) );
  
  	if ( self.performance && self.performance.memory ) {
  
  		var memPanel = addPanel( new Stats.Panel( 'MB', '#f08', '#201' ) );
  
  	}
  
  	showPanel( 0 );
  
  	return {
  
  		REVISION: 16,
  
  		dom: container,
  
  		addPanel: addPanel,
  		showPanel: showPanel,
  
  		begin: function () {
  
  			beginTime = ( performance || Date ).now();
  
  		},
  
  		end: function () {
  
  			frames ++;
  
  			var time = ( performance || Date ).now();
  
  			msPanel.update( time - beginTime, 200 );
  
  			if ( time > prevTime + 1000 ) {
  
  				fpsPanel.update( ( frames * 1000 ) / ( time - prevTime ), 100 );
  
  				prevTime = time;
  				frames = 0;
  
  				if ( memPanel ) {
  
  					var memory = performance.memory;
  					memPanel.update( memory.usedJSHeapSize / 1048576, memory.jsHeapSizeLimit / 1048576 );
  
  				}
  
  			}
  
  			return time;
  
  		},
  
  		update: function () {
  
  			beginTime = this.end();
  
  		},
  
  		// Backwards Compatibility
  
  		domElement: container,
  		setMode: showPanel
  
  	};
  
  };
  
  Stats.Panel = function ( name, fg, bg ) {
  
  	var min = Infinity, max = 0, round = Math.round;
  	var PR = round( window.devicePixelRatio || 1 );
  
  	var WIDTH = 80 * PR, HEIGHT = 48 * PR,
  			TEXT_X = 3 * PR, TEXT_Y = 2 * PR,
  			GRAPH_X = 3 * PR, GRAPH_Y = 15 * PR,
  			GRAPH_WIDTH = 74 * PR, GRAPH_HEIGHT = 30 * PR;
  
  	var canvas = document.createElement( 'canvas' );
  	canvas.width = WIDTH;
  	canvas.height = HEIGHT;
  	canvas.style.cssText = 'width:80px;height:48px';
  
  	var context = canvas.getContext( '2d' );
  	context.font = 'bold ' + ( 9 * PR ) + 'px Helvetica,Arial,sans-serif';
  	context.textBaseline = 'top';
  
  	context.fillStyle = bg;
  	context.fillRect( 0, 0, WIDTH, HEIGHT );
  
  	context.fillStyle = fg;
  	context.fillText( name, TEXT_X, TEXT_Y );
  	context.fillRect( GRAPH_X, GRAPH_Y, GRAPH_WIDTH, GRAPH_HEIGHT );
  
  	context.fillStyle = bg;
  	context.globalAlpha = 0.9;
  	context.fillRect( GRAPH_X, GRAPH_Y, GRAPH_WIDTH, GRAPH_HEIGHT );
  
  	return {
  
  		dom: canvas,
  
  		update: function ( value, maxValue ) {
  
  			min = Math.min( min, value );
  			max = Math.max( max, value );
  
  			context.fillStyle = bg;
  			context.globalAlpha = 1;
  			context.fillRect( 0, 0, WIDTH, GRAPH_Y );
  			context.fillStyle = fg;
  			context.fillText( round( value ) + ' ' + name + ' (' + round( min ) + '-' + round( max ) + ')', TEXT_X, TEXT_Y );
  
  			context.drawImage( canvas, GRAPH_X + PR, GRAPH_Y, GRAPH_WIDTH - PR, GRAPH_HEIGHT, GRAPH_X, GRAPH_Y, GRAPH_WIDTH - PR, GRAPH_HEIGHT );
  
  			context.fillRect( GRAPH_X + GRAPH_WIDTH - PR, GRAPH_Y, PR, GRAPH_HEIGHT );
  
  			context.fillStyle = bg;
  			context.globalAlpha = 0.9;
  			context.fillRect( GRAPH_X + GRAPH_WIDTH - PR, GRAPH_Y, PR, round( ( 1 - ( value / maxValue ) ) * GRAPH_HEIGHT ) );
  
  		}
  
  	};
  
  };
  
  
  export { Stats };
  