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/*!
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 * bkcore.threejs.RenderManager helps handling multiple scenes, cameras and render loops.
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 * 
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 * @author Thibaut 'BKcore' Despoulain <http://bkcore.com>
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 * @license MIT
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 * 
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 * Initialize the a RenderManager by passing a Renderer object:
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 * 		var renderManager = new bkcore.threejs.RenderManager(new THREE.WebGLRenderer());
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 * 
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 * A render setup structure :
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 * 		{
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 * 			id 		<String>		: render setup ID,
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 * 			scene 	<THREE.Scene>	: main scene, 
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 * 			camera 	<THREE.Camera>	: main camera, 
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 * 			render 	<Function>		: render loop called when render setup is active (current), 
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 * 			objects <Dic>			: object references accessible in the render loop via this.objects
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 * 		}
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 * 	
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 * The render method's context will be the render setup's object, so in your render loop:
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 * 		function(delta, renderer)
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 * 		{
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 * 			this.scene;
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 * 			this.camera;
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 * 			this.id;
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 * 			this.objects;
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 * 			renderer.render(...);
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 * 		}
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 * 		
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 * Use the "objects" attribute to store useful references and variables like time, geometries, materials, etc.
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 * Example:
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 * 		renderManager.add('mySetup', scene, camera, function(delta, renderer)
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 *		{
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 *			this.objects.timer += delta;
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 *			this.objects.torus.rotation.z = Math.PI * Math.cos(this.objects.timer);
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 *			renderer.render(this.scene, this.camera);
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 *		},
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 *		{
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 *			timer: 0,
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 *			torus: torusMesh
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 *		});
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 */
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var bkcore = bkcore || {};
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bkcore.threejs = bkcore.threejs || {};
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(function(w){
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	var perfNow;
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	var perfNowNames = ['now', 'webkitNow', 'msNow', 'mozNow'];
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	if(!!w['performance']) for(var i = 0; i < perfNowNames.length; ++i)
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	{
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		var n = perfNowNames[i];
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		if(!!w['performance'][n])
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		{
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			perfNow = function(){return w['performance'][n]()};
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			break;
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		}
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	}
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	if(!perfNow)
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	{
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		perfNow = Date.now;
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	}
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	w.perfNow = perfNow;
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})(window);
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bkcore.threejs.RenderManager = function(renderer)
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{
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	this.renderer = renderer;
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	this.time = window.perfNow();
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	this.renders = {};
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	this.current = {};
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	this.size = 0;
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	this.defaultRenderMethod = function(delta, renderer)
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	{
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		renderer.render(this.scene, this.camera);
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	};
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};
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bkcore.threejs.RenderManager.prototype.add = function(id, scene, camera, render, objects)
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{
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	render = render || this.defaultRenderMethod;
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	objects = objects || {};
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	this.renders[id] = {
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		id: id,
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		scene: scene, 
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		camera: camera, 
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		render: render, 
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		objects: objects
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	};
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	if(this.size == 0) this.current = this.renders[id];
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	this.size++;
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};
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bkcore.threejs.RenderManager.prototype.get = function(id)
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{
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	return this.renders[id];
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};
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bkcore.threejs.RenderManager.prototype.remove = function(id)
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{
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	if(id in this.renders)
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	{
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		delete this.renders[id];
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		this.size--;
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	}
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};
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bkcore.threejs.RenderManager.prototype.renderCurrent = function()
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{
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	if(this.current && this.current.render)
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	{
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		var now = window.perfNow();
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		var delta = now - this.time;
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		this.time = now;
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		this.current.render.call(this.current, delta, this.renderer);
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	}
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	else console.warn('RenderManager: No current render defined.');
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};
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bkcore.threejs.RenderManager.prototype.setCurrent = function(id)
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{
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	if(id in this.renders)
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	{
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		this.current = this.renders[id];
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	}
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	else console.warn('RenderManager: Render "'+id+'" not found.');
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};
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