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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - 2D compressed texture array</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">
</head>
<script id="vs" type="x-shader/x-vertex">
uniform vec2 size;
out vec2 vUv;
void main() {
gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
// Convert position.xy to 1.0-0.0
vUv.xy = position.xy / size + 0.5;
vUv.y = 1.0 - vUv.y; // original data is upside down
}
</script>
<script id="fs" type="x-shader/x-fragment">
precision highp float;
precision highp int;
precision highp sampler2DArray;
uniform sampler2DArray diffuse;
in vec2 vUv;
uniform int depth;
out vec4 outColor;
void main() {
vec4 color = texture( diffuse, vec3( vUv, depth ) );
// lighten a bit
outColor = vec4( color.rgb + .2, 1.0 );
}
</script>
<body>
<div id="info">
<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - 2D Compressed Texture Array<br />
Loop from the movie Spirited away
by the <a href="https://www.ghibli.jp/" target="_blank" rel="noopener">Studio Ghibli</a><br />
</div>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"three": "../build/three.module.js",
"three/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
import Stats from 'three/addons/libs/stats.module.js';
import { KTX2Loader } from 'three/addons/loaders/KTX2Loader.js';
import WebGL from 'three/addons/capabilities/WebGL.js';
if ( WebGL.isWebGL2Available() === false ) {
document.body.appendChild( WebGL.getWebGL2ErrorMessage() );
}
let camera, scene, mesh, renderer, stats, clock;
const planeWidth = 50;
const planeHeight = 25;
let depthStep = 1;
init();
animate();
function init() {
const container = document.createElement( 'div' );
document.body.appendChild( container );
camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 0.1, 2000 );
camera.position.z = 70;
scene = new THREE.Scene();
//
clock = new THREE.Clock();
renderer = new THREE.WebGLRenderer();
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
//
const ktx2Loader = new KTX2Loader();
ktx2Loader.setTranscoderPath( 'js/libs/basis/' );
ktx2Loader.detectSupport( renderer );
ktx2Loader.load( 'textures/spiritedaway.ktx2', function ( texturearray ) {
const material = new THREE.ShaderMaterial( {
uniforms: {
diffuse: { value: texturearray },
depth: { value: 55 },
size: { value: new THREE.Vector2( planeWidth, planeHeight ) }
},
vertexShader: document.getElementById( 'vs' ).textContent.trim(),
fragmentShader: document.getElementById( 'fs' ).textContent.trim(),
glslVersion: THREE.GLSL3
} );
const geometry = new THREE.PlaneGeometry( planeWidth, planeHeight );
mesh = new THREE.Mesh( geometry, material );
scene.add( mesh );
} );
stats = new Stats();
container.appendChild( stats.dom );
window.addEventListener( 'resize', onWindowResize );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function animate() {
requestAnimationFrame( animate );
if ( mesh ) {
const delta = clock.getDelta() * 10;
depthStep += delta;
const value = depthStep % 5;
mesh.material.uniforms[ 'depth' ].value = value;
}
render();
stats.update();
}
function render() {
renderer.render( scene, camera );
}
</script>
</body>
</html>