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webaudio_visualizer.html
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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">
<button id="startButton">Play</button>
</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="importmap">
{
"imports": {
"three": "../build/three.module.js",
"three/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
let scene, camera, renderer, analyser, uniforms;
const startButton = document.getElementById( 'startButton' );
startButton.addEventListener( 'click', init );
function init() {
const fftSize = 128;
//
const overlay = document.getElementById( 'overlay' );
overlay.remove();
//
const container = document.getElementById( 'container' );
scene = new THREE.Scene();
camera = new THREE.Camera();
//
const listener = new THREE.AudioListener();
const audio = new THREE.Audio( listener );
const file = './sounds/376737_Skullbeatz___Bad_Cat_Maste.mp3';
if ( /(iPad|iPhone|iPod)/g.test( navigator.userAgent ) ) {
const loader = new THREE.AudioLoader();
loader.load( file, function ( buffer ) {
audio.setBuffer( buffer );
audio.play();
} );
} else {
const mediaElement = new Audio( file );
mediaElement.play();
audio.setMediaElementSource( mediaElement );
}
analyser = new THREE.AudioAnalyser( audio, fftSize );
//
uniforms = {
tAudioData: { value: new THREE.DataTexture( analyser.data, fftSize / 2, 1, THREE.RedFormat ) }
};
const material = new THREE.ShaderMaterial( {
uniforms: uniforms,
vertexShader: document.getElementById( 'vertexShader' ).textContent,
fragmentShader: document.getElementById( 'fragmentShader' ).textContent
} );
const geometry = new THREE.PlaneGeometry( 1, 1 );
const mesh = new THREE.Mesh( geometry, material );
scene.add( mesh );
//
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.setAnimationLoop( animate );
container.appendChild( renderer.domElement );
//
window.addEventListener( 'resize', onWindowResize );
}
function onWindowResize() {
renderer.setSize( window.innerWidth, window.innerHeight );
}
function animate() {
analyser.getFrequencyData();
uniforms.tAudioData.value.needsUpdate = true;
renderer.render( scene, camera );
}
</script>
</body>
</html>