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253 lines
7.2 KiB
253 lines
7.2 KiB
<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>Three.js - postprocessing - 3DLUT w/loader</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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<style>
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html, body {
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min-height: 100%;
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font-family: monospace;
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background: #222;
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color: white;
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}
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canvas {
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min-width: 512px;
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min-height: 64px;
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image-rendering: pixelated;
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}
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#cube {
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max-width: calc(100% - 20px);
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overflow: auto;
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}
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</style>
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</head>
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<body>
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<h1>Adobe LUT to PNG converter</h1>
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<p>Drag and drop a LUT file here</p>
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<div>size:<input id="size" type="number" value="8" min="2" max="64"/></div>
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<p id="result"></p>
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<p><button type="button">Save...</button></p>
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<div id="cube"><canvas id="c"></canvas></div>
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</body>
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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/": "../../examples/jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import * as lutParser from './resources/lut-reader.js';
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import * as dragAndDrop from './resources/drag-and-drop.js';
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import {EffectComposer} from 'three/addons/postprocessing/EffectComposer.js';
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import {RenderPass} from 'three/addons/postprocessing/RenderPass.js';
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import {ShaderPass} from 'three/addons/postprocessing/ShaderPass.js';
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function main() {
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const canvas = document.querySelector('#c');
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const renderer = new THREE.WebGLRenderer({canvas});
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const makeIdentityLutTexture = function() {
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const identityLUT = new Uint8Array([
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0, 0, 0, 255, // black
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255, 0, 0, 255, // red
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0, 0, 255, 255, // blue
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255, 0, 255, 255, // magenta
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0, 255, 0, 255, // green
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255, 255, 0, 255, // yellow
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0, 255, 255, 255, // cyan
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255, 255, 255, 255, // white
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]);
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return function(filter) {
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const texture = new THREE.DataTexture(identityLUT, 4, 2);
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texture.minFilter = filter;
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texture.magFilter = filter;
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texture.needsUpdate = true;
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texture.flipY = false;
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return texture;
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};
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}();
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const sceneBG = new THREE.Scene();
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const cameraBG = new THREE.OrthographicCamera(-1, 1, 1, -1, -1, 1);
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const ctx = document.createElement('canvas').getContext('2d');
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function drawColorCubeImage(ctx, size) {
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const canvas = ctx.canvas;
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canvas.width = size * size;
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canvas.height = size;
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for (let zz = 0; zz < size; ++zz) {
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for (let yy = 0; yy < size; ++yy) {
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for (let xx = 0; xx < size; ++xx) {
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const r = Math.floor(xx / (size - 1) * 255);
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const g = Math.floor(yy / (size - 1) * 255);
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const b = Math.floor(zz / (size - 1) * 255);
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ctx.fillStyle = `rgb(${r},${g},${b})`;
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ctx.fillRect(zz * size + xx, yy, 1, 1);
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}
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}
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}
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}
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const idTexture = new THREE.CanvasTexture(ctx.canvas);
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idTexture.magFilter = THREE.NearestFilter;
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idTexture.minFilter = THREE.NearestFilter;
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{
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const planeGeo = new THREE.PlaneGeometry(2, 2);
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const planeMat = new THREE.MeshBasicMaterial({
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map: idTexture,
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depthTest: false,
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});
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sceneBG.add(new THREE.Mesh(planeGeo, planeMat));
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}
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const lutShader = {
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uniforms: {
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tDiffuse: { value: null },
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lutMap: { value: null },
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lutMapSize: { value: 1, },
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},
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vertexShader: `
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varying vec2 vUv;
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void main() {
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vUv = uv;
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gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
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}
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`,
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fragmentShader: `
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#include <common>
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#define FILTER_LUT true
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uniform sampler2D tDiffuse;
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uniform sampler2D lutMap;
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uniform float lutMapSize;
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varying vec2 vUv;
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vec4 sampleAs3DTexture(sampler2D tex, vec3 texCoord, float size) {
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float sliceSize = 1.0 / size; // space of 1 slice
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float slicePixelSize = sliceSize / size; // space of 1 pixel
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float width = size - 1.0;
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float sliceInnerSize = slicePixelSize * width; // space of size pixels
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float zSlice0 = floor( texCoord.z * width);
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float zSlice1 = min( zSlice0 + 1.0, width);
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float xOffset = slicePixelSize * 0.5 + texCoord.x * sliceInnerSize;
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float yRange = (texCoord.y * width + 0.5) / size;
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float s0 = xOffset + (zSlice0 * sliceSize);
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#ifdef FILTER_LUT
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float s1 = xOffset + (zSlice1 * sliceSize);
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vec4 slice0Color = texture2D(tex, vec2(s0, yRange));
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vec4 slice1Color = texture2D(tex, vec2(s1, yRange));
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float zOffset = mod(texCoord.z * width, 1.0);
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return mix(slice0Color, slice1Color, zOffset);
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#else
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return texture2D(tex, vec2( s0, yRange));
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#endif
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}
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void main() {
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vec4 originalColor = texture2D(tDiffuse, vUv);
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gl_FragColor = sampleAs3DTexture(lutMap, originalColor.xyz, lutMapSize);
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}
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`,
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};
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const effectLUT = new ShaderPass(lutShader);
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effectLUT.renderToScreen = true;
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const renderBG = new RenderPass(sceneBG, cameraBG);
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const rtParameters = {
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minFilter: THREE.NearestFilter,
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magFilter: THREE.NearestFilter
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};
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const composer = new EffectComposer(renderer, new THREE.WebGLRenderTarget(1, 1, rtParameters));
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composer.addPass(renderBG);
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composer.addPass(effectLUT);
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let name = 'identity';
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const lutTexture = makeIdentityLutTexture(THREE.LinearFilter);
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effectLUT.uniforms.lutMap.value = lutTexture;
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effectLUT.uniforms.lutMapSize.value = 2;
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const sizeElem = document.querySelector('#size');
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sizeElem.addEventListener('change', render);
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function render() {
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const size = parseInt(sizeElem.value);
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renderer.setSize(size * size, size, false);
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composer.setSize(size * size, size);
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drawColorCubeImage(ctx, size);
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idTexture.needsUpdate = true;
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composer.render(0);
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}
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render();
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dragAndDrop.setup({msg: 'Drop LUT File here'});
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dragAndDrop.onDropFile(readLUTFile);
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function ext(s) {
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const period = s.lastIndexOf('.');
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return s.slice(period + 1);
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}
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function readLUTFile(file) {
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const reader = new FileReader();
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reader.onload = (e) => {
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const type = ext(file.name);
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const lut = lutParser.lutTo2D3Drgba8(lutParser.parse(e.target.result, type));
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effectLUT.uniforms.lutMapSize.value = lut.size;
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lutTexture.image.data = lut.data;
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lutTexture.image.width = lut.size * lut.size;
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lutTexture.image.height = lut.size;
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lutTexture.needsUpdate = true;
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render();
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name = `${file.name || lut.name || 'untitled'}`;
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document.querySelector('#result').textContent = `loaded: ${name}`;
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};
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reader.readAsText(file);
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}
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const saveData = (function() {
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const a = document.createElement('a');
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document.body.appendChild(a);
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a.style.display = 'none';
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return function saveData(blob, fileName) {
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const url = window.URL.createObjectURL(blob);
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a.href = url;
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a.download = fileName;
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a.click();
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};
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}());
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document.querySelector('button').addEventListener('click', () => {
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render();
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renderer.domElement.toBlob((blob) => {
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saveData(blob, `${name}-s${renderer.domElement.height}.png`);
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});
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});
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}
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main();
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</script>
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</html>
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