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multipleCubesFFT.html
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multipleCubesFFT.html
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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head profile="http://www.w3.org/2005/10/profile">
<title> Visualise! </title>
<script type="text/javascript" src="glMatrix-0.9.5.min.js"></script>
<script type="text/javascript" src="webgl-utils.js"></script>
<script id="shader-fs" type="x-shader/x-fragment">
precision mediump float;
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;
var sound;
function webGLStart() {
// One-liner to resume playback when user interacted with the page.
document.querySelector('button').addEventListener('click', function() {
var sound = new Sound();
sound.load('offkey_070221---snake-eyes-160.mp3');
});
var canvas = document.getElementById("canvas");
gl = WebGLUtils.setupWebGL(canvas);
gl.viewportWidth = canvas.width;
gl.viewportHeight = canvas.height;
initShaders();
initBuffers();
initCubes();
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.enable(gl.DEPTH_TEST);
sound = new Sound();
sound.load('offkey_070221---snake-eyes-160.mp3');
tick();
}
function tick() {
requestAnimFrame(tick);
animate();
drawScene();
}
var lastTime = 0;
function animate() {
var timeNow = new Date().getTime();
if (lastTime != 0) {
var elapsed = timeNow - lastTime;
sound.processAudio(elapsed);
for (var i in cubes) {
cubes[i].animate(elapsed);
}
}
lastTime = timeNow;
}
var cubes = [];
var spacing = 4.0;
function initCubes() {
var numCubes = 20;
for (var i=0; i < numCubes; i++) {
cubes.push(new Cube(i * spacing, -20, numCubes * -5.0));
}
}
function drawScene() {
gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
mat4.perspective(45, gl.viewportWidth / gl.viewportHeight, 0.1, 100.0, pMatrix);
gl.blendFunc(gl.SRC_ALPHA, gl.ONE);
gl.enable(gl.BLEND);
mat4.identity(mvMatrix);
var centreOfCubes = (((cubes.length-1) * spacing) / 2.0) * -1.0;
mat4.translate(mvMatrix, [centreOfCubes, 0, 0]);
for (var i in cubes) {
cubes[i].draw();
}
}
var shaderProgram;
function initShaders() {
var fragmentShader = getShader("shader-fs");
var vertexShader = getShader("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");
}
function getShader(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 mvMatrix = mat4.create();
var mvMatrixStack = [];
var pMatrix = mat4.create();
function mvPushMatrix() {
var copy = mat4.create();
mat4.set(mvMatrix, copy);
mvMatrixStack.push(copy);
}
function mvPopMatrix() {
if (mvMatrixStack.length == 0) {
throw "Invalid popMatrix!";
}
mvMatrix = mvMatrixStack.pop();
}
function setMatrixUniforms() {
gl.uniformMatrix4fv(shaderProgram.pMatrixUniform, false, pMatrix);
gl.uniformMatrix4fv(shaderProgram.mvMatrixUniform, false, mvMatrix);
}
function degToRad(degrees) {
return degrees * Math.PI / 180;
}
var cubeVertexPositionBuffer;
var cubeVertexColorBuffer;
var cubeVertexIndexBuffer;
function initBuffers() {
cubeVertexPositionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer);
vertices = [
// Front face
-1.0, -1.0, 1.0,
1.0, -1.0, 1.0,
1.0, 1.0, 1.0,
-1.0, 1.0, 1.0,
// Back face
-1.0, -1.0, -1.0,
-1.0, 1.0, -1.0,
1.0, 1.0, -1.0,
1.0, -1.0, -1.0,
// Top face
-1.0, 1.0, -1.0,
-1.0, 1.0, 1.0,
1.0, 1.0, 1.0,
1.0, 1.0, -1.0,
// Bottom face
-1.0, -1.0, -1.0,
1.0, -1.0, -1.0,
1.0, -1.0, 1.0,
-1.0, -1.0, 1.0,
// Right face
1.0, -1.0, -1.0,
1.0, 1.0, -1.0,
1.0, 1.0, 1.0,
1.0, -1.0, 1.0,
// Left face
-1.0, -1.0, -1.0,
-1.0, -1.0, 1.0,
-1.0, 1.0, 1.0,
-1.0, 1.0, -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);
colors = [
[1.0, 0.0, 0.0, 1.0], // Front face
[1.0, 1.0, 0.0, 1.0], // Back face
[0.0, 1.0, 0.0, 1.0], // Top face
[1.0, 0.5, 0.5, 1.0], // Bottom face
[1.0, 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;
}
function Cube(startingX, startingY, startingZ) {
var rCube = 0;
var bounceAmount = startingY;
var cubeX = startingX;
var cubeY = startingY;
var cubeZ = startingZ;
this.draw = function() {
mvPushMatrix();
//console.log("cubeX = " + cubeX + " cubeY = " + cubeY + " cubeZ = " + cubeZ);
mat4.translate(mvMatrix, [cubeX, bounceAmount, cubeZ]);
mat4.rotate(mvMatrix, degToRad(rCube), [1, 1, 1]);
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();
};
this.animate = function(elapsed) {
rCube -= (75 * elapsed) / 1000.0;
};
this.bounce = function(bounceFactor) {
bounceAmount = bounceFactor + cubeY;
};
}
function Sound() {
var self = this;
var context = new AudioContext();
var source;
var jsProcessor;
var analyser;
var freqByteData;
var gainNode;
var timer = 50;
var sampleRate = 50;
this.processAudio = function(elapsed) {
if (timer >= 50) {
analyser.getByteFrequencyData(freqByteData);
for (var i=0; i < cubes.length; i++) {
var bounce = calculateAvgLevel(i, freqByteData);
cubes[i].bounce(bounce);
}
timer = 0;
} else {
timer += elapsed;
}
};
function calculateAvgLevel(cubeNo, freqByteData) {
var ratio = Math.round((freqByteData.length / cubes.length) / 3);
var lowerBound = cubeNo * ratio;
var upperBound = ((cubeNo + 1) * ratio) - 1;
var bounce = 0;
for (var i = lowerBound; i <= upperBound; i++) {
bounce += freqByteData[i];
}
if (bounce > 0) {
bounce = bounce / 100;
}
return bounce;
}
this.initAudio = function(arrayBuffer) {
source = context.createBufferSource();
if (context.decodeAudioData) {
context.decodeAudioData(arrayBuffer, function(buffer) {
source.buffer = buffer;
}, function(e) {
console.log(e);
});
} else {
source.buffer = context.createBuffer(arrayBuffer,false /*Mix to mono*/);
}
jsProcessor = context.createScriptProcessor(2048 /*bufferSize*/, 1 /*num inputs*/, 1 /*num outputs*/);
//jsProcessor.onaudioprocess = this.processAudio;
analyser = context.createAnalyser();
freqByteData = new Uint8Array(analyser.frequencyBinCount);
source.connect(context.destination);
source.connect(analyser);
analyser.connect(jsProcessor);
jsProcessor.connect(context.destination);
source.loop = true;
var gain = context.createGain();
source.connect(gain);
gain.gain.value = 0.2;
gain.connect(context.destination);
source.start(0);
};
this.load = function(url) {
var request = new XMLHttpRequest();
request.open('GET', url, true);
request.responseType = 'arraybuffer';
request.onload = function() {
self.initAudio(request.response);
};
request.send();
};
}
</script>
</head>
<body onload="webGLStart()">
<button>Go!</button>
<canvas id="canvas" style="border:none;" width="800" height="800"/></canvas>
</body>
</html>