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cubies.html
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<html>
<head>
<title>Learning WebGL — lesson 4</title>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<script type="text/javascript" src="sylvester.js"></script>
<script type="text/javascript" src="glUtils.js"></script>
<script id="shader-fs" type="x-shader/x-fragment">
#ifdef GL_ES
precision highp float;
#endif
varying vec4 vColor;
void main(void) {
gl_FragColor = vColor;
}
</script>
<script id="shader-vs" type="x-shader/x-vertex">
attribute vec3 aVertexPosition;
attribute vec4 aVertexColor;
uniform mat4 uMVMatrix;
uniform mat4 uPMatrix;
varying vec4 vColor;
void main(void) {
gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0);
vColor = aVertexColor;
}
</script>
<script type="text/javascript">
var gl;
function initGL(canvas) {
try {
gl = canvas.getContext("experimental-webgl");
gl.viewportWidth = canvas.width;
gl.viewportHeight = canvas.height;
} catch(e) {
}
if (!gl) {
alert("Could not initialise WebGL, sorry :-(");
}
}
function getShader(gl, id) {
var shaderScript = document.getElementById(id);
if (!shaderScript) {
return null;
}
var str = "";
var k = shaderScript.firstChild;
while (k) {
if (k.nodeType == 3) {
str += k.textContent;
}
k = k.nextSibling;
}
var shader;
if (shaderScript.type == "x-shader/x-fragment") {
shader = gl.createShader(gl.FRAGMENT_SHADER);
} else if (shaderScript.type == "x-shader/x-vertex") {
shader = gl.createShader(gl.VERTEX_SHADER);
} else {
return null;
}
gl.shaderSource(shader, str);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
alert(gl.getShaderInfoLog(shader));
return null;
}
return shader;
}
var shaderProgram;
function initShaders() {
var fragmentShader = getShader(gl, "shader-fs");
var vertexShader = getShader(gl, "shader-vs");
shaderProgram = gl.createProgram();
gl.attachShader(shaderProgram, vertexShader);
gl.attachShader(shaderProgram, fragmentShader);
gl.linkProgram(shaderProgram);
if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
alert("Could not initialise shaders");
}
gl.useProgram(shaderProgram);
shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition");
gl.enableVertexAttribArray(shaderProgram.vertexPositionAttribute);
shaderProgram.vertexColorAttribute = gl.getAttribLocation(shaderProgram, "aVertexColor");
gl.enableVertexAttribArray(shaderProgram.vertexColorAttribute);
shaderProgram.pMatrixUniform = gl.getUniformLocation(shaderProgram, "uPMatrix");
shaderProgram.mvMatrixUniform = gl.getUniformLocation(shaderProgram, "uMVMatrix");
}
var mvMatrix;
var mvMatrixStack = [];
function mvPushMatrix(m) {
if (m) {
mvMatrixStack.push(m.dup());
mvMatrix = m.dup();
} else {
mvMatrixStack.push(mvMatrix.dup());
}
}
function mvPopMatrix() {
if (mvMatrixStack.length == 0) {
throw "Invalid popMatrix!";
}
mvMatrix = mvMatrixStack.pop();
return mvMatrix;
}
function loadIdentity() {
mvMatrix = Matrix.I(4);
}
function multMatrix(m) {
mvMatrix = mvMatrix.x(m);
}
function mvTranslate(v) {
var m = Matrix.Translation($V([v[0], v[1], v[2]])).ensure4x4();
multMatrix(m);
}
function mvRotate(ang, v) {
var arad = ang * Math.PI / 180.0;
var m = Matrix.Rotation(arad, $V([v[0], v[1], v[2]])).ensure4x4();
multMatrix(m);
}
var pMatrix;
function perspective(fovy, aspect, znear, zfar) {
pMatrix = makePerspective(fovy, aspect, znear, zfar);
}
function setMatrixUniforms() {
gl.uniformMatrix4fv(shaderProgram.pMatrixUniform, false, new Float32Array(pMatrix.flatten()));
gl.uniformMatrix4fv(shaderProgram.mvMatrixUniform, false, new Float32Array(mvMatrix.flatten()));
}
var xRot = 0;
var xSpeed = 0;
var yRot = 0;
var ySpeed = 0;
var z = -20.0;
var filter = 0;
var currentlyPressedKeys = Object();
function handleKeyDown(event) {
currentlyPressedKeys[event.keyCode] = true;
if (String.fromCharCode(event.keyCode) == "F") {
filter += 1;
if (filter == 3) {
filter = 0;
}
}
}
function handleKeyUp(event) {
currentlyPressedKeys[event.keyCode] = false;
}
function handleKeys() {
if (currentlyPressedKeys[33]) {
// Page Up
z -= 0.05;
}
if (currentlyPressedKeys[34]) {
// Page Down
z += 0.05;
}
if (currentlyPressedKeys[37]) {
// Left cursor key
ySpeed -= 1;
}
if (currentlyPressedKeys[39]) {
// Right cursor key
ySpeed += 1;
}
if (currentlyPressedKeys[38]) {
// Up cursor key
xSpeed -= 1;
}
if (currentlyPressedKeys[40]) {
// Down cursor key
xSpeed += 1;
}
if (currentlyPressedKeys[32]) {
// Down cursor key
xSpeed = 0;
ySpeed=0;
}
}
var cubeVertexPositionBuffer;
var cubeVertexColorBuffer;
var cubeVertexIndexBuffer;
var cubeVertexPositionBuffer1;
var cubeVertexColorBuffer1;
var cubeVertexIndexBuffer1;
var cubeVertexPositionBuffer2;
var cubeVertexColorBuffer2;
var cubeVertexIndexBuffer2;
var cubeVertexPositionBuffer3;
var cubeVertexColorBuffer3;
var cubeVertexIndexBuffer3;
function initBuffers() {
cubeVertexPositionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer);
vertices = [
0.1, -2.1, 1.0,
2.1, -2.1, 1.0,
2.1, -0.1, 1.0,
0.1, -0.1, 1.0,
// Back face
0.1, -2.1, -1.0,
0.1, -0.1, -1.0,
2.1, -0.1, -1.0,
2.1, -2.1, -1.0,
// Top face
0.1, -0.1, -1.0,
0.1, -0.1, 1.0,
2.1, -0.1, 1.0,
2.1, -0.1, -1.0,
// Bottom face
0.1, -2.1, -1.0,
2.1, -2.1, -1.0,
2.1, -2.1, 1.0,
0.1, -2.1, 1.0,
// Right face
2.1, -2.1, -1.0,
2.1, -0.1, -1.0,
2.1, -0.1, 1.0,
2.1, -2.1, 1.0,
// Left face
0.1, -2.1, -1.0,
0.1, -2.1, 1.0,
0.1, -0.1, 1.0,
0.1, -0.1, -1.0
];
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
cubeVertexPositionBuffer.itemSize = 3;
cubeVertexPositionBuffer.numItems = 24;
cubeVertexColorBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexColorBuffer);
var colors = [
[1.0, 0.0, 0.0, 1.0], // Front face
[0.0, 0.0, 1.0, 1.0], // Back face
[0.0, 1.0, 0.0, 1.0], // Top face
[0.0, 0.0, 1.0, 1.0], // Bottom face
[0.0, 0.0, 1.0, 1.0], // Right face
[0.0, 0.0, 1.0, 1.0], // Left face
];
var unpackedColors = []
for (var i in colors) {
var color = colors[i];
for (var j=0; j < 4; j++) {
unpackedColors = unpackedColors.concat(color);
}
}
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(unpackedColors), gl.STATIC_DRAW);
cubeVertexColorBuffer.itemSize = 4;
cubeVertexColorBuffer.numItems = 24;
cubeVertexIndexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeVertexIndexBuffer);
var cubeVertexIndices = [
0, 1, 2, 0, 2, 3, // Front face
4, 5, 6, 4, 6, 7, // Back face
8, 9, 10, 8, 10, 11, // Top face
12, 13, 14, 12, 14, 15, // Bottom face
16, 17, 18, 16, 18, 19, // Right face
20, 21, 22, 20, 22, 23 // Left face
]
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(cubeVertexIndices), gl.STATIC_DRAW);
cubeVertexIndexBuffer.itemSize = 1;
cubeVertexIndexBuffer.numItems = 36;
cubeVertexPositionBuffer1 = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer1);
vertices = [
0.1, 2.1, 1.0,
2.1, 2.1, 1.0,
2.1, 0.1, 1.0,
0.1, 0.1, 1.0,
// Back face
0.1, 2.1, -1.0,
0.1, 0.1, -1.0,
2.1, 0.1, -1.0,
2.1, 2.1, -1.0,
// Top face
0.1, 0.1, -1.0,
0.1, 0.1, 1.0,
2.1, 0.1, 1.0,
2.1, 0.1, -1.0,
// Bottom face
0.1, 2.1, -1.0,
2.1, 2.1, -1.0,
2.1, 2.1, 1.0,
0.1, 2.1, 1.0,
// Right face
2.1, 2.1, -1.0,
2.1, 0.1, -1.0,
2.1, 0.1, 1.0,
2.1, 2.1, 1.0,
// Left face
0.1, 2.1, -1.0,
0.1, 2.1, 1.0,
0.1, 0.1, 1.0,
0.1, 0.1, -1.0
];
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
cubeVertexPositionBuffer1.itemSize = 3;
cubeVertexPositionBuffer1.numItems = 24;
cubeVertexColorBuffer1 = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexColorBuffer1);
var colors = [
[1.0, 0.0, 0.0, 1.0], // Front face
[0.0, 0.0, 1.0, 1.0], // Back face
[0.0, 1.0, 0.0, 1.0], // Top face
[0.0, 0.0, 1.0, 1.0], // Bottom face
[0.0, 0.0, 1.0, 1.0], // Right face
[0.0, 0.0, 1.0, 1.0], // Left face
];
var unpackedColors = []
for (var i in colors) {
var color = colors[i];
for (var j=0; j < 4; j++) {
unpackedColors = unpackedColors.concat(color);
}
}
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(unpackedColors), gl.STATIC_DRAW);
cubeVertexColorBuffer1.itemSize = 4;
cubeVertexColorBuffer1.numItems = 24;
cubeVertexIndexBuffer1 = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeVertexIndexBuffer1);
var cubeVertexIndices = [
0, 1, 2, 0, 2, 3, // Front face
4, 5, 6, 4, 6, 7, // Back face
8, 9, 10, 8, 10, 11, // Top face
12, 13, 14, 12, 14, 15, // Bottom face
16, 17, 18, 16, 18, 19, // Right face
20, 21, 22, 20, 22, 23 // Left face
]
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(cubeVertexIndices), gl.STATIC_DRAW);
cubeVertexIndexBuffer1.itemSize = 1;
cubeVertexIndexBuffer1.numItems = 36;
cubeVertexPositionBuffer2 = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer2);
vertices = [
-2.1, -2.1, 1.0,
-0.1, -2.1, 1.0,
-0.1, -0.1, 1.0,
-2.1, -0.1, 1.0,
// Back face
-2.1, -2.1, -1.0,
-2.1, -0.1, -1.0,
-0.1, -0.1, -1.0,
-0.1, -2.1, -1.0,
// Top face
-2.1, -0.1, -1.0,
-2.1, -0.1, 1.0,
-0.1, -0.1, 1.0,
-0.1, -0.1, -1.0,
// Bottom face
-2.1, -2.1, -1.0,
-0.1, -2.1, -1.0,
-0.1, -2.1, 1.0,
-2.1, -2.1, 1.0,
// Right face
-0.1, -2.1, -1.0,
-0.1, -0.1, -1.0,
-0.1, -0.1, 1.0,
-0.1, -2.1, 1.0,
// Left face
-2.1, -2.1, -1.0,
-2.1, -2.1, 1.0,
-2.1, -0.1, 1.0,
-2.1, -0.1, -1.0
];
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
cubeVertexPositionBuffer2.itemSize = 3;
cubeVertexPositionBuffer2.numItems = 24;
cubeVertexColorBuffer2 = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexColorBuffer2);
var colors = [
[1.0, 0.0, 0.0, 1.0], // Front face
[0.0, 0.0, 1.0, 1.0], // Back face
[0.0, 1.0, 0.0, 1.0], // Top face
[0.0, 0.0, 1.0, 1.0], // Bottom face
[0.0, 0.0, 1.0, 1.0], // Right face
[0.0, 0.0, 1.0, 1.0], // Left face
];
var unpackedColors = []
for (var i in colors) {
var color = colors[i];
for (var j=0; j < 4; j++) {
unpackedColors = unpackedColors.concat(color);
}
}
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(unpackedColors), gl.STATIC_DRAW);
cubeVertexColorBuffer2.itemSize = 4;
cubeVertexColorBuffer2.numItems = 24;
cubeVertexIndexBuffer2 = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeVertexIndexBuffer2);
var cubeVertexIndices = [
0, 1, 2, 0, 2, 3, // Front face
4, 5, 6, 4, 6, 7, // Back face
8, 9, 10, 8, 10, 11, // Top face
12, 13, 14, 12, 14, 15, // Bottom face
16, 17, 18, 16, 18, 19, // Right face
20, 21, 22, 20, 22, 23 // Left face
]
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(cubeVertexIndices), gl.STATIC_DRAW);
cubeVertexIndexBuffer2.itemSize = 1;
cubeVertexIndexBuffer2.numItems = 36;
cubeVertexPositionBuffer3 = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer3);
vertices = [
-2.1, 2.1, 1.0,
-0.1, 2.1, 1.0,
-0.1, 0.1, 1.0,
-2.1, 0.1, 1.0,
// Back face
-2.1, 2.1, -1.0,
-2.1, 0.1, -1.0,
-0.1, 0.1, -1.0,
-0.1, 2.1, -1.0,
// Top face
-2.1, 0.1, -1.0,
-2.1, 0.1, 1.0,
-0.1, 0.1, 1.0,
-0.1, 0.1, -1.0,
// Bottom face
-2.1, 2.1, -1.0,
-0.1, 2.1, -1.0,
-0.1, 2.1, 1.0,
-2.1, 2.1, 1.0,
// Right face
-0.1, 2.1, -1.0,
-0.1, 0.1, -1.0,
-0.1, 0.1, 1.0,
-0.1, 2.1, 1.0,
// Left face
-2.1, 2.1, -1.0,
-2.1, 2.1, 1.0,
-2.1, 0.1, 1.0,
-2.1, 0.1, -1.0
];
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
cubeVertexPositionBuffer3.itemSize = 3;
cubeVertexPositionBuffer3.numItems = 24;
cubeVertexColorBuffer3 = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexColorBuffer3);
var colors = [
[1.0, 0.0, 0.0, 1.0], // Front face
[0.0, 0.0, 1.0, 1.0], // Back face
[0.0, 1.0, 0.0, 1.0], // Top face
[0.0, 0.0, 1.0, 1.0], // Bottom face
[0.0, 0.0, 1.0, 1.0], // Right face
[0.0, 0.0, 1.0, 1.0], // Left face
];
var unpackedColors = []
for (var i in colors) {
var color = colors[i];
for (var j=0; j < 4; j++) {
unpackedColors = unpackedColors.concat(color);
}
}
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(unpackedColors), gl.STATIC_DRAW);
cubeVertexColorBuffer3.itemSize = 4;
cubeVertexColorBuffer3.numItems = 24;
cubeVertexIndexBuffer3 = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeVertexIndexBuffer3);
var cubeVertexIndices = [
0, 1, 2, 0, 2, 3, // Front face
4, 5, 6, 4, 6, 7, // Back face
8, 9, 10, 8, 10, 11, // Top face
12, 13, 14, 12, 14, 15, // Bottom face
16, 17, 18, 16, 18, 19, // Right face
20, 21, 22, 20, 22, 23 // Left face
]
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(cubeVertexIndices), gl.STATIC_DRAW);
cubeVertexIndexBuffer3.itemSize = 1;
cubeVertexIndexBuffer3.numItems = 36;
}
var rCube =0;
function drawScene() {
gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
perspective(45, gl.viewportWidth / gl.viewportHeight,0.1, 100.0);
loadIdentity();
mvTranslate([0, 0, z])
mvPushMatrix();
mvRotate(xRot, [1, 0, 0]);
mvRotate(yRot, [0, 1, 0]);
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer);
gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, cubeVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexColorBuffer);
gl.vertexAttribPointer(shaderProgram.vertexColorAttribute, cubeVertexColorBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeVertexIndexBuffer);
setMatrixUniforms();
gl.drawElements(gl.TRIANGLES, cubeVertexIndexBuffer.numItems, gl.UNSIGNED_SHORT, 0);
mvPopMatrix();
mvTranslate([0, 0, 0])
mvPushMatrix();
mvRotate(xRot, [1, 0, 0]);
mvRotate(yRot, [0, 1, 0]);
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer1);
gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, cubeVertexPositionBuffer1.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexColorBuffer1);
gl.vertexAttribPointer(shaderProgram.vertexColorAttribute, cubeVertexColorBuffer1.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeVertexIndexBuffer1);
setMatrixUniforms();
gl.drawElements(gl.TRIANGLES, cubeVertexIndexBuffer1.numItems, gl.UNSIGNED_SHORT, 0);
mvPopMatrix();
mvTranslate([0, 0, 0])
mvPushMatrix();
mvRotate(xRot, [1, 0, 0]);
mvRotate(yRot, [0, 1, 0]);
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer2);
gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, cubeVertexPositionBuffer2.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexColorBuffer2);
gl.vertexAttribPointer(shaderProgram.vertexColorAttribute, cubeVertexColorBuffer2.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeVertexIndexBuffer2);
setMatrixUniforms();
gl.drawElements(gl.TRIANGLES, cubeVertexIndexBuffer2.numItems, gl.UNSIGNED_SHORT, 0);
mvPopMatrix();
mvTranslate([0, 0, 0])
mvPushMatrix();
mvRotate(xRot, [1, 0, 0]);
mvRotate(yRot, [0, 1, 0]);
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer3);
gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, cubeVertexPositionBuffer3.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexColorBuffer3);
gl.vertexAttribPointer(shaderProgram.vertexColorAttribute, cubeVertexColorBuffer3.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeVertexIndexBuffer3);
setMatrixUniforms();
gl.drawElements(gl.TRIANGLES, cubeVertexIndexBuffer3.numItems, gl.UNSIGNED_SHORT, 0);
mvPopMatrix();
}
var lastTime = 0;
function animate() {
var timeNow = new Date().getTime();
if (lastTime != 0) {
var elapsed = timeNow - lastTime;
xRot += (xSpeed * elapsed) / 1000.0;
yRot += (ySpeed * elapsed) / 1000.0;
}
lastTime = timeNow;
}
function tick() {
handleKeys();
drawScene();
animate();
}
function webGLStart() {
var canvas = document.getElementById("lesson04-canvas");
initGL(canvas);
initShaders()
initBuffers();
gl.clearColor(1.0, 1.0, 0.0, 1.0);
gl.clearDepth(1.0);
gl.enable(gl.DEPTH_TEST);
gl.depthFunc(gl.LEQUAL);
document.onkeydown = handleKeyDown;
document.onkeyup = handleKeyUp;
setInterval(tick, 10);
}
</script>
</head>
<body onload="webGLStart();">
<a href="http://learningwebgl.com/blog/?p=370"><< Back to Lesson 4</a><br />
<canvas id="lesson04-canvas" style="border: none;" width="600" height="600"></canvas>
<br/>
<a href="http://learningwebgl.com/blog/?p=370"><< Back to Lesson 4</a><br />
</body>
</html>