"use strict"; // 參考 https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode
////////////////////////////////////////////////////////////////////////////////
// 加上反射貼圖
////////////////////////////////////////////////////////////////////////////////
var camera, scene, renderer;
var cameraControls;
var clock = new THREE.Clock();
var teapotSize = 400;

function fillScene() {
	scene = new THREE.Scene();

// 燈光
	scene.add( new THREE.AmbientLight( 0x333333 ) );

var light = new THREE.DirectionalLight( 0xFFFFFF, 0.9 );
	light.position.set( -1300, 700, 1240 );

scene.add( light );

light = new THREE.DirectionalLight( 0xFFFFFF, 0.7 );
	light.position.set( 1000, -500, -1200 );

scene.add( light );

// 材質
	var path = "/cs291/texture/skybox/";
	var urls = [path + "px.jpg", path + "nx.jpg",
				path + "py.jpg", path + "ny.jpg",
				path + "pz.jpg", path + "nz.jpg" ];

var textureCube = THREE.ImageUtils.loadTextureCube( urls );
	textureCube.format = THREE.RGBFormat;

var teapotMaterial = new THREE.MeshPhongMaterial(
		{ color: 0x770000, specular:0xffaaaa } );

var teapot = new THREE.Mesh(
		new THREE.TeapotGeometry( teapotSize,
			8, true, true, true, true, true ),
		teapotMaterial );

scene.add( teapot );

var shader = THREE.ShaderLib.cube;
	shader.uniforms.tCube.value = textureCube;

var skyMaterial = new THREE.ShaderMaterial( {
		fragmentShader: shader.fragmentShader,
		vertexShader: shader.vertexShader,
		uniforms: shader.uniforms,
		depthWrite: false,
		side: THREE.BackSide
	} );

var sky = new THREE.Mesh( new THREE.CubeGeometry( 5000, 5000, 5000 ), skyMaterial );
	scene.add( sky );
}

function init() {
	canvasWidth = window.innerWidth;
	canvasHeight = window.innerHeight;
	var canvasRatio = canvasWidth/canvasHeight;

// 攝影機
	camera = new THREE.PerspectiveCamera( 45, canvasWidth/ canvasHeight, 100, 20000 );
	camera.position.set( -222, 494, 1746 );

// RENDERER
	renderer = new THREE.WebGLRenderer( { antialias: true } );
	renderer.setSize( canvasWidth, canvasHeight );
	renderer.setClearColorHex( 0xAAAAAA, 1.0 );
	renderer.gammaInput = true;
	renderer.gammaOutput = true;

// 控制
	cameraControls = new THREE.OrbitAndPanControls( camera, renderer.domElement );
	cameraControls.target.set(0, -160, 0);
}

// 事件處理
function addToDOM() {
	var container = document.getElementById('container');
	var canvas = container.getElementsByTagName('canvas');
	if (canvas.length>0) {
		container.removeChild(canvas[0]);
	}
	container.appendChild( renderer.domElement );
}

function animate() {
	requestAnimationFrame( animate );
	render();
}

function render() {
	var delta = clock.getDelta();
	cameraControls.update( delta );

renderer.render( scene, camera );
}