WebGL Beginner's Guide - Code / 1727_03 / ch3_Ambient_Test.html

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<html>

<head>
<title>WebGL Beginner's Guide - Chapter 3 - Ambient Test</title>
<meta http-equiv='content-type' content='text/html; charset=ISO-8859-1'>

<!-- CSS Styles //-->
<link href='css/style.css' 		type='text/css' rel='stylesheet'>
<link href='css/desert.css' 	type='text/css' rel='stylesheet'/>
<link href='css/colorpicker.css' 	type='text/css' rel='stylesheet'/>
<link href='css/smoothness/jquery-ui-1.8.13.custom.css' type='text/css' rel='stylesheet' />

<!-- JavaScript Libraries //-->
<script type='text/javascript' src='js/gl-matrix-min.js'></script>
<script type='text/javascript' src='js/jquery-1.5.1.min.js'></script>
<script type='text/javascript' src='js/jquery-ui-1.8.13.custom.min.js'></script> 
<script type='text/javascript' src='js/prettify.js'></script>
<script type='text/javascript' src='js/utils.js'></script>
<script type='text/javascript' src='js/colorpicker.js'></script>
<script type='text/javascript' src='js/codeview.js'></script>


<script id="shader-vs" type="x-shader/x-vertex">
attribute vec3 aVertexPosition;
attribute vec3 aVertexNormal;

uniform mat4 uMVMatrix; 
uniform mat4 uPMatrix; 
uniform mat4 uNMatrix;
 
uniform float uShininess;		 //shininness
uniform vec3 uLightDirection;	 //light direction

uniform vec4 uLightAmbient;      //light ambient property
uniform vec4 uLightDiffuse;      //light diffuse property 
uniform vec4 uLightSpecular;     //light specular property

uniform vec4 uMaterialAmbient;	 //object ambient property
uniform vec4 uMaterialDiffuse;   //object diffuse property
uniform vec4 uMaterialSpecular;  //object specular property

varying vec4 vFinalColor;

void main(void) {

	//Transformed vertex position
	vec4 vertex = uMVMatrix * vec4(aVertexPosition, 1.0);
	
	//Transformed normal position
    vec3 N = vec3(uNMatrix * vec4(aVertexNormal, 1.0));
	
	//Invert and normalize light to calculate lambertTerm
    vec3 L = normalize(uLightDirection); 
	
	//Lambert's cosine law
	float lambertTerm = clamp(dot(N,-L),0.0,1.0);
	
	//Ambient Term
    vec4 Ia = uLightAmbient * uMaterialAmbient;
	
	//Diffuse Term
	vec4 Id = vec4(0.0,0.0,0.0,1.0);
	
	//Specular Term
	vec4 Is = vec4(0.0,0.0,0.0,1.0);
    
	
    Id = uLightDiffuse* uMaterialDiffuse * lambertTerm; //add diffuse term
    
    vec3 eyeVec = -vec3(vertex.xyz);
    vec3 E = normalize(eyeVec);
    vec3 R = reflect(L, N);
    float specular = pow(max(dot(R, E), 0.0), uShininess );
    
    Is = uLightSpecular * uMaterialSpecular * specular;	//add specular term

	
	//Final color
	vFinalColor = Ia + Id + Is;
	vFinalColor.a = 1.0;

	//Transformed vertex position
	gl_Position = uPMatrix * vertex;
}
</script>

<script id="shader-fs" type="x-shader/x-fragment">
#ifdef GL_ES
precision highp float;
#endif

varying vec4 vFinalColor;

void main(void)
{
	gl_FragColor = vFinalColor;
}
</script>


<script id='code-js' type="text/javascript">

var gl = null; // WebGL context
var prg = null; // The program (shaders)
var c_width = 0; // Variable to store the width of the canvas
var c_height = 0; // Variable to store the height of the canvas
var clearColor = [0.3,0.3,0.3,1.0];

var mvMatrix = mat4.create(); // The Model-View matrix
var pMatrix = mat4.create(); // The projection matrix

/*-----------------------------------------------------*/
var nMatrix =  mat4.create();      // The normal matrix
/*-----------------------------------------------------*/

var sphereVerticesBuffer;
var sphereIndicesBuffer;

/*-----------------------------------------------------*/
var sphereNormalsBuffer;              //VBO for Normals
/*-----------------------------------------------------*/


var vertices;
var indices;
/*-----------------------------------------------------*/
var normals;              //JavaScript Array for Normals
/*-----------------------------------------------------*/

var angle = 0;

/**
* The program contains a series of instructions that tell the Graphic Processing Unit (GPU)
* what to do with every vertex and fragment that we pass it. 
* The vertex shader and the fragment shader together are called the program.
*/
function initProgram() {
	var fragmentShader        = utils.getShader(gl, "shader-fs");
    var vertexShader          = utils.getShader(gl, "shader-vs");
	prg = gl.createProgram();
	gl.attachShader(prg, vertexShader);
	gl.attachShader(prg, fragmentShader);
	gl.linkProgram(prg);

	if (!gl.getProgramParameter(prg, gl.LINK_STATUS)) {
		alert("Could not initialise shaders");
	}

	gl.useProgram(prg);

	prg.aVertexPosition    = gl.getAttribLocation(prg, "aVertexPosition");
	prg.aVertexNormal      = gl.getAttribLocation(prg, "aVertexNormal");
		
	prg.uPMatrix   		   = gl.getUniformLocation(prg, "uPMatrix");
	prg.uMVMatrix  	       = gl.getUniformLocation(prg, "uMVMatrix");
	prg.uNMatrix           = gl.getUniformLocation(prg, "uNMatrix");
	
	prg.uMaterialAmbient	= gl.getUniformLocation(prg, "uMaterialAmbient");	
	prg.uMaterialDiffuse    = gl.getUniformLocation(prg, "uMaterialDiffuse");
	prg.uMaterialSpecular	= gl.getUniformLocation(prg, "uMaterialSpecular");
	
	prg.uShininess         	= gl.getUniformLocation(prg, "uShininess");
	
	prg.uLightAmbient     	= gl.getUniformLocation(prg, "uLightAmbient");
	prg.uLightDiffuse       = gl.getUniformLocation(prg, "uLightDiffuse");
	prg.uLightSpecular		= gl.getUniformLocation(prg, "uLightSpecular");
	
	prg.uLightDirection    	= gl.getUniformLocation(prg, "uLightDirection");

}


function initLights(){
	gl.uniform3fv(prg.uLightDirection, [-0.25, -0.25, -0.25]);
	gl.uniform4fv(prg.uLightAmbient,[0.03,0.03,0.03,1.0]);
	gl.uniform4fv(prg.uLightDiffuse, [1.0,1.0,1.0,1.0]);	
	gl.uniform4fv(prg.uLightSpecular, [1.0,1.0,1.0,1.0]);
    
	gl.uniform4fv(prg.uMaterialAmbient, [1.0,1.0,1.0,1.0]);
	gl.uniform4fv(prg.uMaterialDiffuse, [46/256,99/256,191/256,1.0]);
	gl.uniform4fv(prg.uMaterialSpecular, [1.0,1.0,1.0,1.0]);
    gl.uniform1f(prg.uShininess, 10.0);
}

/**
* This function generates SPHERE data and creates the buffers
*/
function initBuffers()
{
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	normals = utils.calculateNormals(vertices, indices);
	 	
	sphereVerticesBuffer = gl.createBuffer();
	gl.bindBuffer(gl.ARRAY_BUFFER, sphereVerticesBuffer);
	gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
	
	sphereNormalsBuffer = gl.createBuffer();
	gl.bindBuffer(gl.ARRAY_BUFFER, sphereNormalsBuffer);
	gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(normals), gl.STATIC_DRAW);
	
	sphereIndicesBuffer = gl.createBuffer();
	gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, sphereIndicesBuffer);
	gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(indices), gl.STATIC_DRAW);
	
	gl.bindBuffer(gl.ARRAY_BUFFER, null);
    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);
	
}

/**
* Main rendering function. Called every 500ms according to WebGLStart function (see below)
*/
function drawScene() {
    gl.clearColor(clearColor[0],clearColor[1],clearColor[2],clearColor[3]);
    gl.clearDepth(100.0);
	gl.enable(gl.DEPTH_TEST);
	gl.depthFunc(gl.LEQUAL);
	gl.viewport(0, 0, c_width, c_height);
	gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

	mat4.perspective(45, c_width / c_height, 0.1, 10000.0, pMatrix);
    
    mat4.identity(mvMatrix);
    mat4.translate(mvMatrix, [0.0, 0.0, -1.5]); //Sets the camera to a reasonable distance to view the part
    mat4.rotate(mvMatrix, angle * Math.PI / 180, [0, 1, 0]);	
    
    gl.uniformMatrix4fv(prg.uMVMatrix, false, mvMatrix);
	gl.uniformMatrix4fv(prg.uPMatrix, false, pMatrix);
	
    mat4.set(mvMatrix, nMatrix);
    mat4.inverse(nMatrix);
    mat4.transpose(nMatrix);
    
    gl.uniformMatrix4fv(prg.uNMatrix, false, nMatrix);
    
    
	
    try{
    	gl.enableVertexAttribArray(prg.aVertexPosition);
		gl.enableVertexAttribArray(prg.aVertexNormal);
				
		//2. bind buffers 
		gl.bindBuffer(gl.ARRAY_BUFFER, sphereVerticesBuffer);
		gl.vertexAttribPointer(prg.aVertexPosition, 3, gl.FLOAT, false, 0, 0);
		
		gl.bindBuffer(gl.ARRAY_BUFFER, sphereNormalsBuffer);
		gl.vertexAttribPointer(prg.aVertexNormal,3,gl.FLOAT, false, 0,0);
		
	    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER,sphereIndicesBuffer);
		gl.drawElements(gl.TRIANGLES, indices.length, gl.UNSIGNED_SHORT,0);
		//gl.drawElements(gl.LINES, indices.length, gl.UNSIGNED_SHORT,0);
		gl.bindBuffer(gl.ARRAY_BUFFER, null);
		gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);
		
	}
	catch(err){
		alert(err);
		message(err.description);
	}
}




var lastTime = 0;

/**
* Updates the angle of rotation by a little bit each time
*/
function animate() {
    var timeNow = new Date().getTime();
    if (lastTime != 0) {
        var elapsed = timeNow - lastTime;
        angle += (90 * elapsed) / 10000.0;
    }
    lastTime = timeNow;
}

/**
* Render Loop
*/
function renderLoop() {
    requestAnimFrame(renderLoop);
    drawScene();
    animate();
}

/**
* Entry point. This function is invoked when the page is loaded
*/
function runWebGLApp() {
	//Obtains a WebGL context
	gl = utils.getGLContext("canvas-element-id");
	//Initializes the program (shaders) 
    initProgram();
    //Initializes the buffers that we are going to use
    initBuffers();
    //Initializes lights
 	initLights();
    //Renders the scene!
    renderLoop();
}
</script>
</head>

<body onLoad='runWebGLApp()'>
<div id='top'>
	<h1>WebGL Beginner's Guide - Chapter 3</h1>
	<h2>Ambient Test</h2>
	<div id='logo-packt'><img src='packt.gif'/></div>
	<p>This test will produce negative Lambert coefficients. This happens when you have vertex normals forming an obtuse angle with the negative light-direction vector. 
    
    Set x to 0 and z to 1. You will be locating thie light source behind the sphere. Then, increase the intensity of the ambient light property. As it is explained in Chapter 3, we have modified the ambient light color to show you that when you the object is behind the object and your point of view, you do not account with the diffuse component to see the object.
</p>
</div>

<div id='contents'>
	<div id='canvasContainer'>
		<canvas id='canvas-element-id' width='480' height='400'>
			Your browser does not support the HTML5 canvas element.
		</canvas>
	</div>
</div>

<div id='bottom'>

<table style='padding=0px'>
		<tr>
			<td align='right'>Light Color (Light Diffuse Term):</td><td colspan='2'><div id='colorSelectorLight' class='colorSelector'><div style='background-color:rgb(256,256,256)'></div></div></td>
			<td>Sphere Color (Material Diffuse Term):</td><td colspan='2'><div id='colorSelectorSphere' class='colorSelector'><div style='background-color:rgb(46,99,191)'></div></div></td>	
		</tr>
		<tr>
			<td align='right'>Light Ambient Term:</td><td id='slider-la-value'  width='30px'>0.03</td><td><div id='slider-la'/></td>
			<td>Material Ambient Term:</td><td id='slider-ma-value' width='30px'>1.0</td><td colspan='3'><div id='slider-ma'/></td>
		</tr>
		
		<tr>
			<td align='right'>Light Specular Term:</td><td id='slider-ls-value'  width='30px'>1.0</td><td><div id='slider-ls'/></td>
			<td>Material Specular Term:</td><td id='slider-ms-value' width='30px'>1.0</td><td colspan='3'><div id='slider-ms'/></td>
		</tr>
		<tr>
			
			<td align='right'>X:</td><td id='slider-x-value' width='30px' align='center'>-0.25</td><td width='150px'><div id='slider-x'/></td>
			
			<td>Shininess:</td><td id='slider-s-value' width='30px'>10.0</td><td width='150px'><div id='slider-s'/></td>
		</tr>
		<tr>
			<td align='right'>Y:</td><td id='slider-y-value'  width='30px' align='center'>-0.25</td><td width='150px'><div id='slider-y'/></td>
			<td>Background Color (gl.clearColor):</td><td colspan='2'><div id='colorSelectorBg' class='colorSelector'><div style='background-color:rgb(77,77,77)'></div></div></td>	
		</tr>
		<tr>
			<td align='right'>Z:</td> <td id='slider-z-value'  width='30px' align='center'>-0.25</td><td width='150px'><div id='slider-z'/></td>
			
		</tr>
	</table>

	<br/>
	
	<p>This model has three terms:</p>
	<ul>
	<li><b>Ia</b>: ambient term</li>
	<li><b>Id</b>: diffuse term</li>
	<li><b>Is</b>: specular term</li>
	</ul>
	<p>However, the diffusive and specular terms are only taken into account if the Lambert term is larger than zero.</p>
	<p>In this case: I = <b>Ia</b> + <b>Id</b> + <b>Is</b>,  otherwise (Lambert term <= 0):I = <b>Ia</b></p>
</div>
<script>cview.run(cview.MODE_VIEW);</script>
<script>

function updateShininess(){
    var v = $('#slider-s').slider("value");
	
    gl.uniform1f(prg.uShininess, v);
    $('#slider-s-value').html(v);
}

$('#slider-s').slider({value:10.0, min:0, max:40, step:1, slide: updateShininess});

function updateLightAmbientTerm(){
	var la = $('#slider-la').slider("value");
	gl.uniform4fv(prg.uLightAmbient,[0.0,la,0.0,1.0]);
	$('#slider-la-value').html(la);
}

function updateLightDiffuseTerm(){
	var ld = $('#slider-ld').slider("value");
	gl.uniform4fv(prg.uLightDiffuse,[ld,ld,ld,1.0]);
	$('#slider-ld-value').html(ld);
}

function updateLightSpecularTerm(){
	var ls = $('#slider-ls').slider("value");
	gl.uniform4fv(prg.uLightSpecular,[ls,ls,ls,1.0]);
	$('#slider-ls-value').html(ls);
}


function updateMaterialAmbientTerm(){
	var ma = $('#slider-ma').slider("value");
	gl.uniform4fv(prg.uMaterialAmbient,[ma,ma,ma,1.0]);
	$('#slider-ma-value').html(ma);
}

function updateMaterialSpecularTerm(){
	var ms = $('#slider-ms').slider("value");
	gl.uniform4fv(prg.uMaterialSpecular,[ms,ms,ms,1.0]);
	$('#slider-ms-value').html(ms);
}

$('#slider-la').slider({value:0.03, min:-0.01, max:1.0, step:0.01, slide:updateLightAmbientTerm});
$('#slider-ld').slider({value:0.35, min:-0.01, max:1.0, step:0.01, slide:updateLightDiffuseTerm});
$('#slider-ls').slider({value:1.0, min:-0.01, max:1.0, step:0.01, slide:updateLightSpecularTerm});

$('#slider-ma').slider({value:1.0, min:-0.2, max:1.2, step:0.1, slide:updateMaterialAmbientTerm});
$('#slider-ms').slider({value:1.0, min:-0.01, max:1.2, step:0.1, slide:updateMaterialSpecularTerm});

function updateLightDirection(){
   var x = $('#slider-x').slider("value");
   var y = $('#slider-y').slider("value");
   var z = $('#slider-z').slider("value");
   gl.uniform3fv(prg.uLightDirection, [x,y,z]);
   $('#slider-x-value').html(x);
   $('#slider-y-value').html(y);
   $('#slider-z-value').html(z);
}

$('#slider-x').slider({value:-0.25, min:-1.05, max:1.05, step:0.01, slide:updateLightDirection});
$('#slider-y').slider({value:-0.25, min:-1.05, max:1.05, step:0.01, slide:updateLightDirection});
$('#slider-z').slider({value:-0.25, min:-1.05, max:1.05, step:0.01, slide:updateLightDirection});

function updateObjectColor(r,g,b){
    gl.uniform4fv(prg.uMaterialDiffuse,[r,g,b,1.0]);	
}

function updateLightColor(r,g,b){
    gl.uniform4fv(prg.uLightDiffuse,[r,g,b,1.0]);	
}

function updateClearColor(r,g,b){
    clearColor = [r,g,b,1.0];
}


$('#colorSelectorSphere').ColorPicker({
    onSubmit: function(hsb, hex, rgb, el) {
			$(el).val(hex);
			$(el).ColorPickerHide();
			
	},
	color: '#00ff00',
    onShow: function (colpkr) {
        $(colpkr).fadeIn(500);
        return false;
    },
    onHide: function (colpkr) {
        $(colpkr).fadeOut(500);
        return false;
    },
    onChange: function (hsb, hex, rgb) {
        $('#colorSelectorSphere div').css('backgroundColor', '#' + hex);
        updateObjectColor(rgb.r/256,rgb.g/256,rgb.b/256);
    },
    
    onBeforeShow: function (colpkr) {
			$(colpkr).ColorPickerSetColor('rgb(0.5,0.8,0.1)');
		}
	})

	
$('#colorSelectorLight').ColorPicker({
    onSubmit: function(hsb, hex, rgb, el) {
			$(el).val(hex);
			$(el).ColorPickerHide();
			
	},
	color: '#00ff00',
    onShow: function (colpkr) {
        $(colpkr).fadeIn(500);
        return false;
    },
    onHide: function (colpkr) {
        $(colpkr).fadeOut(500);
        return false;
    },
    onChange: function (hsb, hex, rgb) {
        $('#colorSelectorLight div').css('backgroundColor', '#' + hex);
        updateLightColor(rgb.r/256,rgb.g/256,rgb.b/256);
    },
    
    onBeforeShow: function (colpkr) {
			$(colpkr).ColorPickerSetColor('rgb(0.5,0.8,0.1)');
		}
	})	
	
$('#colorSelectorBg').ColorPicker({
    onSubmit: function(hsb, hex, rgb, el) {
			$(el).val(hex);
			$(el).ColorPickerHide();
			
	},
	color: '#00ff00',
    onShow: function (colpkr) {
        $(colpkr).fadeIn(500);
        return false;
    },
    onHide: function (colpkr) {
        $(colpkr).fadeOut(500);
        return false;
    },
    onChange: function (hsb, hex, rgb) {
        $('#colorSelectorBg div').css('backgroundColor', '#' + hex);
        updateClearColor(rgb.r/256,rgb.g/256,rgb.b/256);
    },
    
    onBeforeShow: function (colpkr) {
			$(this).ColorPickerSetColor('rgb(0.5,0.8,0.1)');
		}
	})	
	
</script>
</body>
</html>
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