<!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">

<meta property="og:title" content="three.js webaudio - visualizer">

<meta property="og:type" content="website">

<meta property="og:url" content="https://threejs.org/examples/webaudio_visualizer.html">

<meta property="og:image" content="https://threejs.org/examples/screenshots/webaudio_visualizer.jpg">

<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="https://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>