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webaudio_visualizer.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webaudio - visualizer</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<link type="text/css" rel="stylesheet" href="main.css">
<script id="vertexShader" type="x-shader/x-vertex">
varying vec2 vUv;
void main() {
vUv = uv;
gl_Position = vec4( position, 1.0 );
}
</script>
<script id="fragmentShader" type="x-shader/x-fragment">
uniform sampler2D tAudioData;
varying vec2 vUv;
void main() {
vec3 backgroundColor = vec3( 0.125, 0.125, 0.125 );
vec3 color = vec3( 1.0, 1.0, 0.0 );
float f = texture2D( tAudioData, vec2( vUv.x, 0.0 ) ).r;
float i = step( vUv.y, f ) * step( f - 0.0125, vUv.y );
gl_FragColor = vec4( mix( backgroundColor, color, i ), 1.0 );
}
</script>
</head>
<body>
<div id="overlay">
<div>
<button id="startButton">Click to Play</button>
<p>Audio playback requires user interaction.</p>
</div>
</div>
<div id="container"></div>
<div id="info">
<a href="https://threejs.org" target="_blank" rel="noopener noreferrer">three.js</a> webaudio - visualizer<br/>
music by <a href="http://www.newgrounds.com/audio/listen/376737" target="_blank" rel="noopener">skullbeatz</a>
</div>
<script type="module">
import * as THREE from '../build/three.module.js';
var scene, camera, renderer, analyser, uniforms;
var startButton = document.getElementById( 'startButton' );
startButton.addEventListener( 'click', init );
function init() {
var fftSize = 128;
//
var overlay = document.getElementById( 'overlay' );
overlay.remove();
//
var container = document.getElementById( 'container' );
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.setClearColor( 0x000000 );
renderer.setPixelRatio( window.devicePixelRatio );
container.appendChild( renderer.domElement );
scene = new THREE.Scene();
camera = new THREE.Camera();
//
var listener = new THREE.AudioListener();
var audio = new THREE.Audio( listener );
var mediaElement = new Audio( 'sounds/376737_Skullbeatz___Bad_Cat_Maste.mp3' );
mediaElement.loop = true;
mediaElement.play();
audio.setMediaElementSource( mediaElement );
analyser = new THREE.AudioAnalyser( audio, fftSize );
//
uniforms = {
tAudioData: { value: new THREE.DataTexture( analyser.data, fftSize / 2, 1, THREE.LuminanceFormat ) }
};
var material = new THREE.ShaderMaterial( {
uniforms: uniforms,
vertexShader: document.getElementById( 'vertexShader' ).textContent,
fragmentShader: document.getElementById( 'fragmentShader' ).textContent
} );
var geometry = new THREE.PlaneBufferGeometry( 1, 1 );
var mesh = new THREE.Mesh( geometry, material );
scene.add( mesh );
//
window.addEventListener( 'resize', onResize, false );
animate();
}
function onResize() {
renderer.setSize( window.innerWidth, window.innerHeight );
}
function animate() {
requestAnimationFrame( animate );
render();
}
function render() {
analyser.getFrequencyData();
uniforms.tAudioData.value.needsUpdate = true;
renderer.render( scene, camera );
}
</script>
</body>
</html>