examples/integrated/index.html

<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - gainmap hdr</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">
		<style>
			.lbl {
				color: #fff;
				font-size: 16px;
				font-weight: bold;
				position: absolute;
				bottom: 0px;
				z-index: 100;
				text-shadow: #000 1px 1px 1px;
				background-color: rgba(0,0,0,0.85);
				padding: 1em;
			}

			#lbl_left {
				text-align:left;
				left:0px;
			}
		</style>
	</head>

	<body>
		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - gain map (ultra hdr) loader <br/>
			Gain map images converted from hdr with <a href="https://gainmap-creator.mono-grid.com/" target="_blank" rel="noopener">Gain map converter</a>. <br />
			See external <a href="https://github.com/MONOGRID/gainmap-js" target="_blank" rel="noopener">gainmap-js</a> for more information on how to use and create gain map images.
		</div>

		<div id="lbl_left" class="lbl"></div>

		<script type="importmap">
			{
				"imports": {
					"three": "https://unpkg.com/three@0.158.0/build/three.module.js",
					"three/addons/": "https://unpkg.com/three@0.158.0/examples/jsm/",
					"@monogrid/gainmap-js": "https://unpkg.com/@monogrid/gainmap-js@2.0.0/dist/decode.js"
				}
			}
		</script>

		<script type="module">

			import * as THREE from 'three';

			import Stats from 'three/addons/libs/stats.module.js';

			import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
			import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
			import { RGBELoader } from 'three/addons/loaders/RGBELoader.js';

			import { GainMapLoader, JPEGRLoader } from '@monogrid/gainmap-js';

			const params = {
				envMap: 'JPEG Gain map',
				roughness: 0.0,
				metalness: 0.0,
				exposure: 1.0,
				debug: false
			};

			let container, stats;
			let camera, scene, renderer, controls;
			let torusMesh, planeMesh;
			let hdrCubeRenderTarget, hdrCubeMap;
			let gainMap, gainmapRenderTarget, gainmapBackground;
			let separateGainMap, separateGainmapRenderTarget, separateGainmapBackground;


			const fileSizes = {};
			const resolutions = {};

			init();
			animate();

			function init() {

				const lbl = document.getElementById( 'lbl_left' );

				container = document.createElement( 'div' );
				document.body.appendChild( container );

				camera = new THREE.PerspectiveCamera( 40, window.innerWidth / window.innerHeight, 1, 1000 );
				camera.position.set( 0, 0, 120 );

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0x000000 );

				renderer = new THREE.WebGLRenderer();
				renderer.toneMapping = THREE.ACESFilmicToneMapping;

				//

				let geometry = new THREE.TorusKnotGeometry( 18, 8, 150, 20 );
				// let geometry = new THREE.SphereGeometry( 26, 64, 32 );
				let material = new THREE.MeshStandardMaterial( {
					color: 0xffffff,
					metalness: params.metalness,
					roughness: params.roughness
				} );

				torusMesh = new THREE.Mesh( geometry, material );
				scene.add( torusMesh );


				geometry = new THREE.PlaneGeometry( 200, 200 );
				material = new THREE.MeshBasicMaterial();

				planeMesh = new THREE.Mesh( geometry, material );
				planeMesh.position.y = - 50;
				planeMesh.rotation.x = - Math.PI * 0.5;
				scene.add( planeMesh );


				const pmremGenerator = new THREE.PMREMGenerator( renderer );
				pmremGenerator.compileCubemapShader();
				pmremGenerator.compileEquirectangularShader();

				THREE.DefaultLoadingManager.onLoad = function ( ) {

					pmremGenerator.dispose();

				};


				gainMap = new JPEGRLoader( renderer )
					.load( 'textures/gainmap/spruit_sunrise_4k.jpg', function ( response ) {

						gainmapRenderTarget = pmremGenerator.fromEquirectangular( response.renderTarget.texture );

						gainmapBackground = response.toDataTexture();
						resolutions[ 'JPEG Gain map' ] = response.width + 'x' + response.height;
						fetchFileSize( 'textures/gainmap/spruit_sunrise_4k.jpg' ).then( function ( size ) {

							fileSizes[ 'JPEG Gain map' ] = humanFileSize( size );
							displayStats( 'JPEG Gain map' );

						} );


						gainmapBackground.mapping = THREE.EquirectangularReflectionMapping;
						gainmapBackground.minFilter = THREE.LinearFilter;
						gainmapBackground.magFilter = THREE.LinearFilter;
						gainmapBackground.generateMipmaps = false;

						gainmapBackground.needsUpdate = true;

					} );

				separateGainMap = new GainMapLoader( renderer )
					.load( [ 'textures/gainmap/spruit_sunrise_4k.webp', 'textures/gainmap/spruit_sunrise_4k-gainmap.webp', 'textures/gainmap/spruit_sunrise_4k.json' ], function ( response ) {

						separateGainmapRenderTarget = pmremGenerator.fromEquirectangular( response.renderTarget.texture );

						separateGainmapBackground = response.toDataTexture();
						fetchFileSize( 'textures/gainmap/spruit_sunrise_4k.webp' )
							.then( function ( sdrSize ) {

								fetchFileSize( 'textures/gainmap/spruit_sunrise_4k-gainmap.webp' ).then( function ( gainMapSize ) {

									fetchFileSize( 'textures/gainmap/spruit_sunrise_4k.json' ).then( function ( metadataSize ) {

										fileSizes[ 'Webp Gain map (separate)' ] = humanFileSize( sdrSize + gainMapSize + metadataSize );

									} );

								} );

							} );
						resolutions[ 'Webp Gain map (separate)' ] = response.width + 'x' + response.height;

						separateGainmapBackground.mapping = THREE.EquirectangularReflectionMapping;
						separateGainmapBackground.minFilter = THREE.LinearFilter;
						separateGainmapBackground.magFilter = THREE.LinearFilter;
						separateGainmapBackground.generateMipmaps = false;

						separateGainmapBackground.needsUpdate = true;

					} );

				hdrCubeMap = new RGBELoader()
					.load( 'textures/gainmap/spruit_sunrise_1k.hdr', function ( response ) {

						fetchFileSize( 'textures/gainmap/spruit_sunrise_1k.hdr' )
							.then( function ( size ) {

								fileSizes[ 'HDR' ] = humanFileSize( size );

							} );

						resolutions[ 'HDR' ] = response.image.width + 'x' + response.image.height;
						hdrCubeRenderTarget = pmremGenerator.fromEquirectangular( response );

						response.mapping = THREE.EquirectangularReflectionMapping;
						response.minFilter = THREE.LinearFilter;
						response.magFilter = THREE.LinearFilter;
						response.needsUpdate = true;

					} );

				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				container.appendChild( renderer.domElement );

				stats = new Stats();
				container.appendChild( stats.dom );

				controls = new OrbitControls( camera, renderer.domElement );
				controls.minDistance = 50;
				controls.maxDistance = 300;

				window.addEventListener( 'resize', onWindowResize );

				const gui = new GUI();

				gui.add( params, 'envMap', [ 'JPEG Gain map', 'Webp Gain map (separate)', 'HDR' ] ).onChange( displayStats );
				gui.add( params, 'roughness', 0, 1, 0.01 );
				gui.add( params, 'metalness', 0, 1, 0.01 );
				gui.add( params, 'exposure', 0, 2, 0.01 );
				gui.add( params, 'debug' );
				gui.open();

				function displayStats( value ) {

					lbl.innerHTML = value + ' size : ' + fileSizes[ value ] + ', Resolution: ' + resolutions[ value ];

				}

			}

			function fetchFileSize( url, key ) {

				return new Promise( function ( resolve, reject ) {

					fetch( url, { method: 'HEAD' } )
						.then( function ( response ) {

							resolve( parseInt( response.headers.get( 'Content-Length' ) ) );

						} )
						.catch( reject );

				} );

			}

			function humanFileSize( bytes, si = true, dp = 1 ) {

				const thresh = si ? 1000 : 1024;

				if ( Math.abs( bytes ) < thresh ) {

					return bytes + ' B';

				}

				const units = si
					? [ 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB' ]
					: [ 'KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB' ];
				let u = - 1;
				const r = 10 ** dp;

				do {

					bytes /= thresh;
					++ u;

				} while ( Math.round( Math.abs( bytes ) * r ) / r >= thresh && u < units.length - 1 );

				return bytes.toFixed( dp ) + ' ' + units[ u ];

			}


			function onWindowResize() {

				const width = window.innerWidth;
				const height = window.innerHeight;

				camera.aspect = width / height;
				camera.updateProjectionMatrix();

				renderer.setSize( width, height );

			}

			function animate() {

				requestAnimationFrame( animate );

				stats.begin();
				render();
				stats.end();

			}

			function render() {

				torusMesh.material.roughness = params.roughness;
				torusMesh.material.metalness = params.metalness;

				let renderTarget, cubeMap;

				switch ( params.envMap ) {

					case 'JPEG Gain map':
						renderTarget = gainmapRenderTarget;
						cubeMap = gainmapBackground || gainMap.renderTarget.texture;
						break;
					case 'Webp Gain map (separate)':
						renderTarget = separateGainmapRenderTarget;
						cubeMap = separateGainmapBackground || separateGainMap.renderTarget.texture;
						break;
					case 'HDR':
						renderTarget = hdrCubeRenderTarget;
						cubeMap = hdrCubeMap;
						break;

				}

				const newEnvMap = renderTarget ? renderTarget.texture : null;

				if ( newEnvMap && newEnvMap !== torusMesh.material.envMap ) {

					torusMesh.material.envMap = newEnvMap;
					torusMesh.material.needsUpdate = true;

					planeMesh.material.map = newEnvMap;
					planeMesh.material.needsUpdate = true;

				}

				torusMesh.rotation.y += 0.005;
				planeMesh.visible = params.debug;

				scene.background = cubeMap;
				renderer.toneMappingExposure = params.exposure;

				renderer.render( scene, camera );

			}

		</script>

	</body>
</html>