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+<!DOCTYPE html>
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+<html lang="en">
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+ <head>
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+ <title>three.js webgl - exporter - ktx2</title>
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+ <meta charset="utf-8">
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+ <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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+ <link type="text/css" rel="stylesheet" href="main.css">
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+ </head>
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+ <body>
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+ <div id="info">
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+ <a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - exporter - ktx2
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+ </div>
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+
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+ <script type="importmap">
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+ {
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+ "imports": {
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+ "three": "../build/three.module.js",
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+ "three/addons/": "./jsm/"
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+ }
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+ }
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+ </script>
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+
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+ <script type="module">
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+
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+ import * as THREE from 'three';
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+
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+ import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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+ import { KTX2Exporter } from 'three/addons/exporters/KTX2Exporter.js';
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+ import { RGBELoader } from 'three/addons/loaders/RGBELoader.js';
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+ import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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+
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+ let scene, camera, renderer, exporter, mesh, controls, renderTarget, dataTexture;
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+
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+ const params = {
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+ target: 'pmrem',
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+ export: exportFile
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+ };
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+
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+ init();
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+
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+ function init() {
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+
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+ renderer = new THREE.WebGLRenderer( { antialias: true } );
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+ renderer.toneMapping = THREE.AgXToneMapping;
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+ renderer.setPixelRatio( window.devicePixelRatio );
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+ renderer.setAnimationLoop( animate );
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+ document.body.appendChild( renderer.domElement );
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+
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+ //
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+
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+ camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 0.1, 100 );
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+ camera.position.set( 10, 0, 0 );
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+
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+ scene = new THREE.Scene();
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+
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+ exporter = new KTX2Exporter();
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+ const rgbeloader = new RGBELoader();
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+
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+ //
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+
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+ const pmremGenerator = new THREE.PMREMGenerator( renderer );
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+ pmremGenerator.compileEquirectangularShader();
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+
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+ rgbeloader.load( 'textures/equirectangular/venice_sunset_1k.hdr', function ( texture ) {
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+
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+ texture.mapping = THREE.EquirectangularReflectionMapping;
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+
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+ renderTarget = pmremGenerator.fromEquirectangular( texture );
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+ scene.background = renderTarget.texture;
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+
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+ } );
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+
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+ createDataTexture();
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+
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+ //
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+
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+ controls = new OrbitControls( camera, renderer.domElement );
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+ controls.enableDamping = true;
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+ controls.rotateSpeed = - 0.25; // negative, to track mouse pointer
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+
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+ //
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+
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+ window.addEventListener( 'resize', onWindowResize );
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+
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+ const gui = new GUI();
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+
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+ gui.add( params, 'target' ).options( [ 'pmrem', 'data-texture' ] ).onChange( swapScene );
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+ gui.add( params, 'export' ).name( 'Export KTX2' );
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+ gui.open();
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+
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+ }
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+
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+ function onWindowResize() {
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+
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+ camera.aspect = window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ }
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+
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+ function animate() {
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+
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+ controls.update();
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+ renderer.render( scene, camera );
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+
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+ }
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+
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+ function createDataTexture() {
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+
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+ const normal = new THREE.Vector3();
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+ const coord = new THREE.Vector2();
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+ const size = 800, radius = 320, factor = Math.PI * 0.5 / radius;
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+ const data = new Float32Array( 4 * size * size );
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+
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+ for ( let i = 0; i < size; i ++ ) {
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+
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+ for ( let j = 0; j < size; j ++ ) {
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+
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+ const idx = i * size * 4 + j * 4;
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+ coord.set( j, i ).subScalar( size / 2 );
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+
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+ if ( coord.length() < radius )
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+ normal.set(
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+ Math.sin( coord.x * factor ),
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+ Math.sin( coord.y * factor ),
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+ Math.cos( coord.x * factor )
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+ );
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+ else
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+ normal.set( 0, 0, 1 );
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+
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+ data[ idx + 0 ] = .5 + .5 * normal.x;
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+ data[ idx + 1 ] = .5 + .5 * normal.y;
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+ data[ idx + 2 ] = .5 + .5 * normal.z;
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+ data[ idx + 3 ] = 1.;
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+
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+ }
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+
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+ }
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+
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+ dataTexture = new THREE.DataTexture( data, size, size, THREE.RGBAFormat, THREE.FloatType );
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+ dataTexture.needsUpdate = true;
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+
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+ const material = new THREE.MeshBasicMaterial( { map: dataTexture } );
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+ const quad = new THREE.PlaneGeometry( 50, 50 );
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+ mesh = new THREE.Mesh( quad, material );
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+ mesh.visible = false;
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+
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+ scene.add( mesh );
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+
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+ }
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+
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+ function swapScene() {
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+
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+ if ( params.target == 'pmrem' ) {
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+
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+ camera.position.set( 10, 0, 0 );
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+ controls.enabled = true;
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+ scene.background = renderTarget.texture;
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+ mesh.visible = false;
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+ renderer.toneMapping = THREE.AgXToneMapping;
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+
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+ } else {
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+
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+ camera.position.set( 0, 0, 70 );
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+ controls.enabled = false;
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+ scene.background = new THREE.Color( 0, 0, 0 );
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+ mesh.visible = true;
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+ renderer.toneMapping = THREE.NoToneMapping;
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+
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+ }
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+
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+ }
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+
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+ async function exportFile() {
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+
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+ let result;
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+
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+ if ( params.target == 'pmrem' )
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+ result = await exporter.parse( renderer, renderTarget );
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+ else
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+ result = await exporter.parse( dataTexture );
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+
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+ saveArrayBuffer( result, params.target + '.ktx2' );
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+
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+ }
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+
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+ function saveArrayBuffer( buffer, filename ) {
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+
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+ const blob = new Blob( [ buffer ], { type: 'image/ktx2' } );
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+ const link = document.createElement( 'a' );
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+
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+ link.href = URL.createObjectURL( blob );
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+ link.download = filename;
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+ link.click();
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+
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+ }
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+
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+ </script>
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+
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+ </body>
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+</html>
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Don McCurdy
