[READ-ONLY] Mirror of https://github.com/flo-bit/text_effect_fluid. cool text fluid effect for your website
flo-bit.dev/text_effect_fluid/
fluid-dynamics
javascript
template
text-effects
first commit
+1751
LDR_LLL1_0.png
LDR_LLL1_0.png
This is a binary file and will not be displayed.
+7
LICENSE
+7
LICENSE
···
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Copyright 2024 flo-bit
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+65
Readme.md
+65
Readme.md
···
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# Text effect: Fluid Simulation
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Inspired by the current (Jan 2024) version of [the lumalabs homepage](https://lumalabs.ai/) (obviously, their effect looks *way* better, than my quick and dirty version):
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Adjusted version of this awesome [WebGL Fluid Simulation](https://github.com/PavelDoGreat/WebGL-Fluid-Simulation).
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## Usage
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- Add `script.js` and `LDR_LLL1_0.png` to your project
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- Add this to your html
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```html
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<div id="canvasContainer">
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<canvas></canvas>
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<canvas id="maskCanvas"> </canvas>
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</div>
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<script src="./script.js"></script>
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```
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- Add this styling
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```css
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html,
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body {
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overflow: hidden;
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background-color: #000;
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}
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body {
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margin: 0;
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}
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#canvasContainer {
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position: relative;
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width: 100vw;
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height: 100vh;
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}
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canvas {
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width: 100%;
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height: 100%;
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position: absolute;
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}
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```
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## License
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MIT License
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```
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Copyright 2024 flo-bit
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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```
cover.png
cover.png
This is a binary file and will not be displayed.
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index.html
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index.html
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<!doctype html>
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<html lang="en" class="bg-black">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>fluid text effect</title>
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<style>
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html,
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body {
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overflow: hidden;
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background-color: #000;
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}
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body {
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margin: 0;
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}
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#canvasContainer {
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position: relative;
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width: 100vw;
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height: 100vh;
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}
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canvas {
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width: 100%;
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height: 100%;
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position: absolute;
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}
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</style>
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</head>
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<body>
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<div id="canvasContainer">
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<canvas></canvas>
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<canvas id="maskCanvas"> </canvas>
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</div>
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<script src="./script.js"></script>
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</body>
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</html>
luma.png
luma.png
This is a binary file and will not be displayed.
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script.js
+1632
script.js
···
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/*
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MIT License
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Copyright (c) 2017 Pavel Dobryakov
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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'use strict';
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const overlayConfig = {
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text: 'flo-bit',
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fontWidth: '900',
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font: 'Arial',
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fontSize: 1/6, // percentage to canvas width
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}
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// overlay canvas
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function resizeOverlayCanvas() {
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let overlayCanvas = document.getElementById('maskCanvas');
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let container = document.getElementById('canvasContainer');
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overlayCanvas.width = container.offsetWidth;
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overlayCanvas.height = container.offsetHeight;
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let ctx = overlayCanvas.getContext('2d');
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let dpr = window.devicePixelRatio || 1;
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let rect = overlayCanvas.getBoundingClientRect();
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overlayCanvas.width = rect.width * dpr;
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overlayCanvas.height = rect.height * dpr;
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ctx.scale(dpr, dpr);
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// Redraw the content
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ctx.fillStyle = 'black';
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ctx.fillRect(0, 0, overlayCanvas.width, overlayCanvas.height);
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let fontSize = Math.round(overlayCanvas.width / 6);
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ctx.font = '900 ' + fontSize + 'px Arial';
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ctx.strokeStyle = 'rgba(255, 255, 255, 0.3)';
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ctx.lineWidth = 2;
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ctx.strokeText('flo-bit', 0, fontSize);
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ctx.globalCompositeOperation = 'destination-out';
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ctx.font = '900 ' + fontSize + 'px Arial';
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ctx.fillText('flo-bit', 0, fontSize);
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}
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// Initial resize
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resizeOverlayCanvas();
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// Resize canvas on window resize
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window.addEventListener('resize', resizeOverlayCanvas);
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// Simulation section
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const canvas = document.getElementsByTagName('canvas')[0];
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resizeCanvas();
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let config = {
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SIM_RESOLUTION: 128,
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DYE_RESOLUTION: 1024,
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CAPTURE_RESOLUTION: 512,
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DENSITY_DISSIPATION: 1.0,
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VELOCITY_DISSIPATION: 0.1,
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PRESSURE: 0.8,
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PRESSURE_ITERATIONS: 20,
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CURL: 30,
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SPLAT_RADIUS: 0.25,
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SPLAT_FORCE: 1000,
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SHADING: true,
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COLORFUL: true,
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COLOR_UPDATE_SPEED: 10,
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PAUSED: false,
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BACK_COLOR: { r: 0, g: 0, b: 0 },
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TRANSPARENT: false,
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BLOOM: false,
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BLOOM_ITERATIONS: 8,
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BLOOM_RESOLUTION: 256,
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BLOOM_INTENSITY: 0.8,
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BLOOM_THRESHOLD: 0.8,
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BLOOM_SOFT_KNEE: 0.7,
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SUNRAYS: true,
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SUNRAYS_RESOLUTION: 196,
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SUNRAYS_WEIGHT: 1.0,
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START_HUE: 0.5,
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END_HUE: 1.0,
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RENDER_SPEED: 0.4
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};
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function PointerPrototype() {
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this.id = -1;
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this.texcoordX = 0;
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this.texcoordY = 0;
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this.prevTexcoordX = 0;
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this.prevTexcoordY = 0;
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this.deltaX = 0;
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this.deltaY = 0;
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this.down = false;
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this.moved = false;
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this.color = [30, 0, 300];
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}
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let pointers = [];
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let splatStack = [];
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pointers.push(new PointerPrototype());
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const { gl, ext } = getWebGLContext(canvas);
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if (isMobile()) {
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config.DYE_RESOLUTION = 512;
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}
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if (!ext.supportLinearFiltering) {
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config.DYE_RESOLUTION = 512;
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config.SHADING = false;
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config.BLOOM = false;
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config.SUNRAYS = false;
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}
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function getWebGLContext(canvas) {
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const params = {
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alpha: true,
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depth: false,
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stencil: true,
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antialias: false,
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preserveDrawingBuffer: false
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};
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let gl = canvas.getContext('webgl2', params);
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const isWebGL2 = !!gl;
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if (!isWebGL2)
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gl = canvas.getContext('webgl', params) || canvas.getContext('experimental-webgl', params);
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let halfFloat;
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let supportLinearFiltering;
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if (isWebGL2) {
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gl.getExtension('EXT_color_buffer_float');
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supportLinearFiltering = gl.getExtension('OES_texture_float_linear');
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} else {
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halfFloat = gl.getExtension('OES_texture_half_float');
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supportLinearFiltering = gl.getExtension('OES_texture_half_float_linear');
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}
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gl.clearColor(0.0, 0.0, 0.0, 1.0);
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const halfFloatTexType = isWebGL2 ? gl.HALF_FLOAT : halfFloat.HALF_FLOAT_OES;
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let formatRGBA;
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let formatRG;
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let formatR;
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if (isWebGL2) {
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formatRGBA = getSupportedFormat(gl, gl.RGBA16F, gl.RGBA, halfFloatTexType);
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formatRG = getSupportedFormat(gl, gl.RG16F, gl.RG, halfFloatTexType);
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formatR = getSupportedFormat(gl, gl.R16F, gl.RED, halfFloatTexType);
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} else {
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formatRGBA = getSupportedFormat(gl, gl.RGBA, gl.RGBA, halfFloatTexType);
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formatRG = getSupportedFormat(gl, gl.RGBA, gl.RGBA, halfFloatTexType);
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formatR = getSupportedFormat(gl, gl.RGBA, gl.RGBA, halfFloatTexType);
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}
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return {
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gl,
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ext: {
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formatRGBA,
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formatRG,
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formatR,
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halfFloatTexType,
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supportLinearFiltering
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}
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};
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}
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function getSupportedFormat(gl, internalFormat, format, type) {
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if (!supportRenderTextureFormat(gl, internalFormat, format, type)) {
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switch (internalFormat) {
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case gl.R16F:
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return getSupportedFormat(gl, gl.RG16F, gl.RG, type);
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case gl.RG16F:
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return getSupportedFormat(gl, gl.RGBA16F, gl.RGBA, type);
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default:
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return null;
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}
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}
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return {
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internalFormat,
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format
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};
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}
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function supportRenderTextureFormat(gl, internalFormat, format, type) {
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let texture = gl.createTexture();
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gl.bindTexture(gl.TEXTURE_2D, texture);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
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gl.texImage2D(gl.TEXTURE_2D, 0, internalFormat, 4, 4, 0, format, type, null);
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let fbo = gl.createFramebuffer();
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gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
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gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
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let status = gl.checkFramebufferStatus(gl.FRAMEBUFFER);
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return status == gl.FRAMEBUFFER_COMPLETE;
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}
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function isMobile() {
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return /Mobi|Android/i.test(navigator.userAgent);
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}
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class Material {
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constructor(vertexShader, fragmentShaderSource) {
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this.vertexShader = vertexShader;
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this.fragmentShaderSource = fragmentShaderSource;
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this.programs = [];
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this.activeProgram = null;
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this.uniforms = [];
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}
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setKeywords(keywords) {
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let hash = 0;
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for (let i = 0; i < keywords.length; i++) hash += hashCode(keywords[i]);
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+
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let program = this.programs[hash];
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if (program == null) {
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let fragmentShader = compileShader(gl.FRAGMENT_SHADER, this.fragmentShaderSource, keywords);
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program = createProgram(this.vertexShader, fragmentShader);
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this.programs[hash] = program;
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}
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if (program == this.activeProgram) return;
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this.uniforms = getUniforms(program);
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this.activeProgram = program;
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}
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bind() {
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gl.useProgram(this.activeProgram);
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}
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}
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class Program {
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constructor(vertexShader, fragmentShader) {
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this.uniforms = {};
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this.program = createProgram(vertexShader, fragmentShader);
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this.uniforms = getUniforms(this.program);
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}
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bind() {
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gl.useProgram(this.program);
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}
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}
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function createProgram(vertexShader, fragmentShader) {
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let program = gl.createProgram();
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gl.attachShader(program, vertexShader);
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gl.attachShader(program, fragmentShader);
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gl.linkProgram(program);
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if (!gl.getProgramParameter(program, gl.LINK_STATUS))
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console.trace(gl.getProgramInfoLog(program));
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return program;
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}
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function getUniforms(program) {
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let uniforms = [];
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let uniformCount = gl.getProgramParameter(program, gl.ACTIVE_UNIFORMS);
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for (let i = 0; i < uniformCount; i++) {
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let uniformName = gl.getActiveUniform(program, i).name;
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uniforms[uniformName] = gl.getUniformLocation(program, uniformName);
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}
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return uniforms;
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}
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function compileShader(type, source, keywords) {
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source = addKeywords(source, keywords);
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const shader = gl.createShader(type);
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gl.shaderSource(shader, source);
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gl.compileShader(shader);
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if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) console.trace(gl.getShaderInfoLog(shader));
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return shader;
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}
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function addKeywords(source, keywords) {
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if (keywords == null) return source;
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let keywordsString = '';
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keywords.forEach((keyword) => {
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keywordsString += '#define ' + keyword + '\n';
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});
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return keywordsString + source;
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}
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const baseVertexShader = compileShader(
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gl.VERTEX_SHADER,
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`
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precision highp float;
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attribute vec2 aPosition;
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varying vec2 vUv;
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varying vec2 vL;
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varying vec2 vR;
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varying vec2 vT;
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varying vec2 vB;
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uniform vec2 texelSize;
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void main () {
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vUv = aPosition * 0.5 + 0.5;
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vL = vUv - vec2(texelSize.x, 0.0);
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vR = vUv + vec2(texelSize.x, 0.0);
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vT = vUv + vec2(0.0, texelSize.y);
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vB = vUv - vec2(0.0, texelSize.y);
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gl_Position = vec4(aPosition, 0.0, 1.0);
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}
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`
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);
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const blurVertexShader = compileShader(
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gl.VERTEX_SHADER,
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`
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precision highp float;
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attribute vec2 aPosition;
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varying vec2 vUv;
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varying vec2 vL;
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varying vec2 vR;
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uniform vec2 texelSize;
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void main () {
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vUv = aPosition * 0.5 + 0.5;
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float offset = 1.33333333;
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vL = vUv - texelSize * offset;
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vR = vUv + texelSize * offset;
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gl_Position = vec4(aPosition, 0.0, 1.0);
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}
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`
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);
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const blurShader = compileShader(
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gl.FRAGMENT_SHADER,
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`
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precision mediump float;
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precision mediump sampler2D;
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varying vec2 vUv;
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varying vec2 vL;
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varying vec2 vR;
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uniform sampler2D uTexture;
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+
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void main () {
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vec4 sum = texture2D(uTexture, vUv) * 0.29411764;
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sum += texture2D(uTexture, vL) * 0.35294117;
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sum += texture2D(uTexture, vR) * 0.35294117;
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gl_FragColor = sum;
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}
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`
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);
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const copyShader = compileShader(
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gl.FRAGMENT_SHADER,
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`
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precision mediump float;
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precision mediump sampler2D;
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+
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varying highp vec2 vUv;
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uniform sampler2D uTexture;
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+
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void main () {
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gl_FragColor = texture2D(uTexture, vUv);
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}
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`
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);
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const clearShader = compileShader(
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gl.FRAGMENT_SHADER,
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`
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precision mediump float;
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precision mediump sampler2D;
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varying highp vec2 vUv;
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uniform sampler2D uTexture;
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uniform float value;
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void main () {
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gl_FragColor = value * texture2D(uTexture, vUv);
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}
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`
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);
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const colorShader = compileShader(
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gl.FRAGMENT_SHADER,
419
+
`
420
+
precision mediump float;
421
+
422
+
uniform vec4 color;
423
+
424
+
void main () {
425
+
gl_FragColor = color;
426
+
}
427
+
`
428
+
);
429
+
430
+
const checkerboardShader = compileShader(
431
+
gl.FRAGMENT_SHADER,
432
+
`
433
+
precision highp float;
434
+
precision highp sampler2D;
435
+
436
+
varying vec2 vUv;
437
+
uniform sampler2D uTexture;
438
+
uniform float aspectRatio;
439
+
440
+
#define SCALE 25.0
441
+
442
+
void main () {
443
+
vec2 uv = floor(vUv * SCALE * vec2(aspectRatio, 1.0));
444
+
float v = mod(uv.x + uv.y, 2.0);
445
+
v = v * 0.1 + 0.8;
446
+
gl_FragColor = vec4(vec3(v), 1.0);
447
+
}
448
+
`
449
+
);
450
+
451
+
const displayShaderSource = `
452
+
precision highp float;
453
+
precision highp sampler2D;
454
+
455
+
varying vec2 vUv;
456
+
varying vec2 vL;
457
+
varying vec2 vR;
458
+
varying vec2 vT;
459
+
varying vec2 vB;
460
+
uniform sampler2D uTexture;
461
+
uniform sampler2D uBloom;
462
+
uniform sampler2D uSunrays;
463
+
uniform sampler2D uDithering;
464
+
uniform vec2 ditherScale;
465
+
uniform vec2 texelSize;
466
+
467
+
vec3 linearToGamma (vec3 color) {
468
+
color = max(color, vec3(0));
469
+
return max(1.055 * pow(color, vec3(0.416666667)) - 0.055, vec3(0));
470
+
}
471
+
472
+
void main () {
473
+
vec3 c = texture2D(uTexture, vUv).rgb;
474
+
475
+
#ifdef SHADING
476
+
vec3 lc = texture2D(uTexture, vL).rgb;
477
+
vec3 rc = texture2D(uTexture, vR).rgb;
478
+
vec3 tc = texture2D(uTexture, vT).rgb;
479
+
vec3 bc = texture2D(uTexture, vB).rgb;
480
+
481
+
float dx = length(rc) - length(lc);
482
+
float dy = length(tc) - length(bc);
483
+
484
+
vec3 n = normalize(vec3(dx, dy, length(texelSize)));
485
+
vec3 l = vec3(0.0, 0.0, 1.0);
486
+
487
+
float diffuse = clamp(dot(n, l) + 0.7, 0.7, 1.0);
488
+
c *= diffuse;
489
+
#endif
490
+
491
+
#ifdef BLOOM
492
+
vec3 bloom = texture2D(uBloom, vUv).rgb;
493
+
#endif
494
+
495
+
#ifdef SUNRAYS
496
+
float sunrays = texture2D(uSunrays, vUv).r;
497
+
c *= sunrays;
498
+
#ifdef BLOOM
499
+
bloom *= sunrays;
500
+
#endif
501
+
#endif
502
+
503
+
#ifdef BLOOM
504
+
float noise = texture2D(uDithering, vUv * ditherScale).r;
505
+
noise = noise * 2.0 - 1.0;
506
+
bloom += noise / 255.0;
507
+
bloom = linearToGamma(bloom);
508
+
c += bloom;
509
+
#endif
510
+
511
+
float a = max(c.r, max(c.g, c.b));
512
+
gl_FragColor = vec4(c, a);
513
+
}
514
+
`;
515
+
516
+
const bloomPrefilterShader = compileShader(
517
+
gl.FRAGMENT_SHADER,
518
+
`
519
+
precision mediump float;
520
+
precision mediump sampler2D;
521
+
522
+
varying vec2 vUv;
523
+
uniform sampler2D uTexture;
524
+
uniform vec3 curve;
525
+
uniform float threshold;
526
+
527
+
void main () {
528
+
vec3 c = texture2D(uTexture, vUv).rgb;
529
+
float br = max(c.r, max(c.g, c.b));
530
+
float rq = clamp(br - curve.x, 0.0, curve.y);
531
+
rq = curve.z * rq * rq;
532
+
c *= max(rq, br - threshold) / max(br, 0.0001);
533
+
gl_FragColor = vec4(c, 0.0);
534
+
}
535
+
`
536
+
);
537
+
538
+
const bloomBlurShader = compileShader(
539
+
gl.FRAGMENT_SHADER,
540
+
`
541
+
precision mediump float;
542
+
precision mediump sampler2D;
543
+
544
+
varying vec2 vL;
545
+
varying vec2 vR;
546
+
varying vec2 vT;
547
+
varying vec2 vB;
548
+
uniform sampler2D uTexture;
549
+
550
+
void main () {
551
+
vec4 sum = vec4(0.0);
552
+
sum += texture2D(uTexture, vL);
553
+
sum += texture2D(uTexture, vR);
554
+
sum += texture2D(uTexture, vT);
555
+
sum += texture2D(uTexture, vB);
556
+
sum *= 0.25;
557
+
gl_FragColor = sum;
558
+
}
559
+
`
560
+
);
561
+
562
+
const bloomFinalShader = compileShader(
563
+
gl.FRAGMENT_SHADER,
564
+
`
565
+
precision mediump float;
566
+
precision mediump sampler2D;
567
+
568
+
varying vec2 vL;
569
+
varying vec2 vR;
570
+
varying vec2 vT;
571
+
varying vec2 vB;
572
+
uniform sampler2D uTexture;
573
+
uniform float intensity;
574
+
575
+
void main () {
576
+
vec4 sum = vec4(0.0);
577
+
sum += texture2D(uTexture, vL);
578
+
sum += texture2D(uTexture, vR);
579
+
sum += texture2D(uTexture, vT);
580
+
sum += texture2D(uTexture, vB);
581
+
sum *= 0.25;
582
+
gl_FragColor = sum * intensity;
583
+
}
584
+
`
585
+
);
586
+
587
+
const sunraysMaskShader = compileShader(
588
+
gl.FRAGMENT_SHADER,
589
+
`
590
+
precision highp float;
591
+
precision highp sampler2D;
592
+
593
+
varying vec2 vUv;
594
+
uniform sampler2D uTexture;
595
+
596
+
void main () {
597
+
vec4 c = texture2D(uTexture, vUv);
598
+
float br = max(c.r, max(c.g, c.b));
599
+
c.a = 1.0 - min(max(br * 20.0, 0.0), 0.8);
600
+
gl_FragColor = c;
601
+
}
602
+
`
603
+
);
604
+
605
+
const sunraysShader = compileShader(
606
+
gl.FRAGMENT_SHADER,
607
+
`
608
+
precision highp float;
609
+
precision highp sampler2D;
610
+
611
+
varying vec2 vUv;
612
+
uniform sampler2D uTexture;
613
+
uniform float weight;
614
+
615
+
#define ITERATIONS 16
616
+
617
+
void main () {
618
+
float Density = 0.3;
619
+
float Decay = 0.95;
620
+
float Exposure = 0.7;
621
+
622
+
vec2 coord = vUv;
623
+
vec2 dir = vUv - 0.5;
624
+
625
+
dir *= 1.0 / float(ITERATIONS) * Density;
626
+
float illuminationDecay = 1.0;
627
+
628
+
float color = texture2D(uTexture, vUv).a;
629
+
630
+
for (int i = 0; i < ITERATIONS; i++)
631
+
{
632
+
coord -= dir;
633
+
float col = texture2D(uTexture, coord).a;
634
+
color += col * illuminationDecay * weight;
635
+
illuminationDecay *= Decay;
636
+
}
637
+
638
+
gl_FragColor = vec4(color * Exposure, 0.0, 0.0, 1.0);
639
+
}
640
+
`
641
+
);
642
+
643
+
const splatShader = compileShader(
644
+
gl.FRAGMENT_SHADER,
645
+
`
646
+
precision highp float;
647
+
precision highp sampler2D;
648
+
649
+
varying vec2 vUv;
650
+
uniform sampler2D uTarget;
651
+
uniform float aspectRatio;
652
+
uniform vec3 color;
653
+
uniform vec2 point;
654
+
uniform float radius;
655
+
656
+
void main () {
657
+
vec2 p = vUv - point.xy;
658
+
p.x *= aspectRatio;
659
+
vec3 splat = exp(-dot(p, p) / radius) * color;
660
+
vec3 base = texture2D(uTarget, vUv).xyz;
661
+
gl_FragColor = vec4(base + splat, 1.0);
662
+
}
663
+
`
664
+
);
665
+
666
+
const advectionShader = compileShader(
667
+
gl.FRAGMENT_SHADER,
668
+
`
669
+
precision highp float;
670
+
precision highp sampler2D;
671
+
672
+
varying vec2 vUv;
673
+
uniform sampler2D uVelocity;
674
+
uniform sampler2D uSource;
675
+
uniform vec2 texelSize;
676
+
uniform vec2 dyeTexelSize;
677
+
uniform float dt;
678
+
uniform float dissipation;
679
+
680
+
vec4 bilerp (sampler2D sam, vec2 uv, vec2 tsize) {
681
+
vec2 st = uv / tsize - 0.5;
682
+
683
+
vec2 iuv = floor(st);
684
+
vec2 fuv = fract(st);
685
+
686
+
vec4 a = texture2D(sam, (iuv + vec2(0.5, 0.5)) * tsize);
687
+
vec4 b = texture2D(sam, (iuv + vec2(1.5, 0.5)) * tsize);
688
+
vec4 c = texture2D(sam, (iuv + vec2(0.5, 1.5)) * tsize);
689
+
vec4 d = texture2D(sam, (iuv + vec2(1.5, 1.5)) * tsize);
690
+
691
+
return mix(mix(a, b, fuv.x), mix(c, d, fuv.x), fuv.y);
692
+
}
693
+
694
+
void main () {
695
+
#ifdef MANUAL_FILTERING
696
+
vec2 coord = vUv - dt * bilerp(uVelocity, vUv, texelSize).xy * texelSize;
697
+
vec4 result = bilerp(uSource, coord, dyeTexelSize);
698
+
#else
699
+
vec2 coord = vUv - dt * texture2D(uVelocity, vUv).xy * texelSize;
700
+
vec4 result = texture2D(uSource, coord);
701
+
#endif
702
+
float decay = 1.0 + dissipation * dt;
703
+
gl_FragColor = result / decay;
704
+
}`,
705
+
ext.supportLinearFiltering ? null : ['MANUAL_FILTERING']
706
+
);
707
+
708
+
const divergenceShader = compileShader(
709
+
gl.FRAGMENT_SHADER,
710
+
`
711
+
precision mediump float;
712
+
precision mediump sampler2D;
713
+
714
+
varying highp vec2 vUv;
715
+
varying highp vec2 vL;
716
+
varying highp vec2 vR;
717
+
varying highp vec2 vT;
718
+
varying highp vec2 vB;
719
+
uniform sampler2D uVelocity;
720
+
721
+
void main () {
722
+
float L = texture2D(uVelocity, vL).x;
723
+
float R = texture2D(uVelocity, vR).x;
724
+
float T = texture2D(uVelocity, vT).y;
725
+
float B = texture2D(uVelocity, vB).y;
726
+
727
+
vec2 C = texture2D(uVelocity, vUv).xy;
728
+
if (vL.x < 0.0) { L = -C.x; }
729
+
if (vR.x > 1.0) { R = -C.x; }
730
+
if (vT.y > 1.0) { T = -C.y; }
731
+
if (vB.y < 0.0) { B = -C.y; }
732
+
733
+
float div = 0.5 * (R - L + T - B);
734
+
gl_FragColor = vec4(div, 0.0, 0.0, 1.0);
735
+
}
736
+
`
737
+
);
738
+
739
+
const curlShader = compileShader(
740
+
gl.FRAGMENT_SHADER,
741
+
`
742
+
precision mediump float;
743
+
precision mediump sampler2D;
744
+
745
+
varying highp vec2 vUv;
746
+
varying highp vec2 vL;
747
+
varying highp vec2 vR;
748
+
varying highp vec2 vT;
749
+
varying highp vec2 vB;
750
+
uniform sampler2D uVelocity;
751
+
752
+
void main () {
753
+
float L = texture2D(uVelocity, vL).y;
754
+
float R = texture2D(uVelocity, vR).y;
755
+
float T = texture2D(uVelocity, vT).x;
756
+
float B = texture2D(uVelocity, vB).x;
757
+
float vorticity = R - L - T + B;
758
+
gl_FragColor = vec4(0.5 * vorticity, 0.0, 0.0, 1.0);
759
+
}
760
+
`
761
+
);
762
+
763
+
const vorticityShader = compileShader(
764
+
gl.FRAGMENT_SHADER,
765
+
`
766
+
precision highp float;
767
+
precision highp sampler2D;
768
+
769
+
varying vec2 vUv;
770
+
varying vec2 vL;
771
+
varying vec2 vR;
772
+
varying vec2 vT;
773
+
varying vec2 vB;
774
+
uniform sampler2D uVelocity;
775
+
uniform sampler2D uCurl;
776
+
uniform float curl;
777
+
uniform float dt;
778
+
779
+
void main () {
780
+
float L = texture2D(uCurl, vL).x;
781
+
float R = texture2D(uCurl, vR).x;
782
+
float T = texture2D(uCurl, vT).x;
783
+
float B = texture2D(uCurl, vB).x;
784
+
float C = texture2D(uCurl, vUv).x;
785
+
786
+
vec2 force = 0.5 * vec2(abs(T) - abs(B), abs(R) - abs(L));
787
+
force /= length(force) + 0.0001;
788
+
force *= curl * C;
789
+
force.y *= -1.0;
790
+
791
+
vec2 velocity = texture2D(uVelocity, vUv).xy;
792
+
velocity += force * dt;
793
+
velocity = min(max(velocity, -1000.0), 1000.0);
794
+
gl_FragColor = vec4(velocity, 0.0, 1.0);
795
+
}
796
+
`
797
+
);
798
+
799
+
const pressureShader = compileShader(
800
+
gl.FRAGMENT_SHADER,
801
+
`
802
+
precision mediump float;
803
+
precision mediump sampler2D;
804
+
805
+
varying highp vec2 vUv;
806
+
varying highp vec2 vL;
807
+
varying highp vec2 vR;
808
+
varying highp vec2 vT;
809
+
varying highp vec2 vB;
810
+
uniform sampler2D uPressure;
811
+
uniform sampler2D uDivergence;
812
+
813
+
void main () {
814
+
float L = texture2D(uPressure, vL).x;
815
+
float R = texture2D(uPressure, vR).x;
816
+
float T = texture2D(uPressure, vT).x;
817
+
float B = texture2D(uPressure, vB).x;
818
+
float C = texture2D(uPressure, vUv).x;
819
+
float divergence = texture2D(uDivergence, vUv).x;
820
+
float pressure = (L + R + B + T - divergence) * 0.25;
821
+
gl_FragColor = vec4(pressure, 0.0, 0.0, 1.0);
822
+
}
823
+
`
824
+
);
825
+
826
+
const gradientSubtractShader = compileShader(
827
+
gl.FRAGMENT_SHADER,
828
+
`
829
+
precision mediump float;
830
+
precision mediump sampler2D;
831
+
832
+
varying highp vec2 vUv;
833
+
varying highp vec2 vL;
834
+
varying highp vec2 vR;
835
+
varying highp vec2 vT;
836
+
varying highp vec2 vB;
837
+
uniform sampler2D uPressure;
838
+
uniform sampler2D uVelocity;
839
+
840
+
void main () {
841
+
float L = texture2D(uPressure, vL).x;
842
+
float R = texture2D(uPressure, vR).x;
843
+
float T = texture2D(uPressure, vT).x;
844
+
float B = texture2D(uPressure, vB).x;
845
+
vec2 velocity = texture2D(uVelocity, vUv).xy;
846
+
velocity.xy -= vec2(R - L, T - B);
847
+
gl_FragColor = vec4(velocity, 0.0, 1.0);
848
+
}
849
+
`
850
+
);
851
+
852
+
const blit = (() => {
853
+
gl.bindBuffer(gl.ARRAY_BUFFER, gl.createBuffer());
854
+
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([-1, -1, -1, 1, 1, 1, 1, -1]), gl.STATIC_DRAW);
855
+
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, gl.createBuffer());
856
+
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array([0, 1, 2, 0, 2, 3]), gl.STATIC_DRAW);
857
+
gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0);
858
+
gl.enableVertexAttribArray(0);
859
+
860
+
return (target, clear = false) => {
861
+
if (target == null) {
862
+
gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);
863
+
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
864
+
} else {
865
+
gl.viewport(0, 0, target.width, target.height);
866
+
gl.bindFramebuffer(gl.FRAMEBUFFER, target.fbo);
867
+
}
868
+
if (clear) {
869
+
gl.clearColor(0.0, 0.0, 0.0, 1.0);
870
+
gl.clear(gl.COLOR_BUFFER_BIT);
871
+
}
872
+
// CHECK_FRAMEBUFFER_STATUS();
873
+
gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0);
874
+
};
875
+
})();
876
+
877
+
function CHECK_FRAMEBUFFER_STATUS() {
878
+
let status = gl.checkFramebufferStatus(gl.FRAMEBUFFER);
879
+
if (status != gl.FRAMEBUFFER_COMPLETE) console.trace('Framebuffer error: ' + status);
880
+
}
881
+
882
+
let dye;
883
+
let velocity;
884
+
let divergence;
885
+
let curl;
886
+
let pressure;
887
+
let bloom;
888
+
let bloomFramebuffers = [];
889
+
let sunrays;
890
+
let sunraysTemp;
891
+
892
+
let ditheringTexture = createTextureAsync('LDR_LLL1_0.png');
893
+
894
+
const blurProgram = new Program(blurVertexShader, blurShader);
895
+
const copyProgram = new Program(baseVertexShader, copyShader);
896
+
const clearProgram = new Program(baseVertexShader, clearShader);
897
+
const colorProgram = new Program(baseVertexShader, colorShader);
898
+
const checkerboardProgram = new Program(baseVertexShader, checkerboardShader);
899
+
const bloomPrefilterProgram = new Program(baseVertexShader, bloomPrefilterShader);
900
+
const bloomBlurProgram = new Program(baseVertexShader, bloomBlurShader);
901
+
const bloomFinalProgram = new Program(baseVertexShader, bloomFinalShader);
902
+
const sunraysMaskProgram = new Program(baseVertexShader, sunraysMaskShader);
903
+
const sunraysProgram = new Program(baseVertexShader, sunraysShader);
904
+
const splatProgram = new Program(baseVertexShader, splatShader);
905
+
const advectionProgram = new Program(baseVertexShader, advectionShader);
906
+
const divergenceProgram = new Program(baseVertexShader, divergenceShader);
907
+
const curlProgram = new Program(baseVertexShader, curlShader);
908
+
const vorticityProgram = new Program(baseVertexShader, vorticityShader);
909
+
const pressureProgram = new Program(baseVertexShader, pressureShader);
910
+
const gradienSubtractProgram = new Program(baseVertexShader, gradientSubtractShader);
911
+
912
+
const displayMaterial = new Material(baseVertexShader, displayShaderSource);
913
+
914
+
function initFramebuffers() {
915
+
let simRes = getResolution(config.SIM_RESOLUTION);
916
+
let dyeRes = getResolution(config.DYE_RESOLUTION);
917
+
918
+
const texType = ext.halfFloatTexType;
919
+
const rgba = ext.formatRGBA;
920
+
const rg = ext.formatRG;
921
+
const r = ext.formatR;
922
+
const filtering = ext.supportLinearFiltering ? gl.LINEAR : gl.NEAREST;
923
+
924
+
gl.disable(gl.BLEND);
925
+
926
+
if (dye == null)
927
+
dye = createDoubleFBO(
928
+
dyeRes.width,
929
+
dyeRes.height,
930
+
rgba.internalFormat,
931
+
rgba.format,
932
+
texType,
933
+
filtering
934
+
);
935
+
else
936
+
dye = resizeDoubleFBO(
937
+
dye,
938
+
dyeRes.width,
939
+
dyeRes.height,
940
+
rgba.internalFormat,
941
+
rgba.format,
942
+
texType,
943
+
filtering
944
+
);
945
+
946
+
if (velocity == null)
947
+
velocity = createDoubleFBO(
948
+
simRes.width,
949
+
simRes.height,
950
+
rg.internalFormat,
951
+
rg.format,
952
+
texType,
953
+
filtering
954
+
);
955
+
else
956
+
velocity = resizeDoubleFBO(
957
+
velocity,
958
+
simRes.width,
959
+
simRes.height,
960
+
rg.internalFormat,
961
+
rg.format,
962
+
texType,
963
+
filtering
964
+
);
965
+
966
+
divergence = createFBO(
967
+
simRes.width,
968
+
simRes.height,
969
+
r.internalFormat,
970
+
r.format,
971
+
texType,
972
+
gl.NEAREST
973
+
);
974
+
curl = createFBO(simRes.width, simRes.height, r.internalFormat, r.format, texType, gl.NEAREST);
975
+
pressure = createDoubleFBO(
976
+
simRes.width,
977
+
simRes.height,
978
+
r.internalFormat,
979
+
r.format,
980
+
texType,
981
+
gl.NEAREST
982
+
);
983
+
984
+
initBloomFramebuffers();
985
+
initSunraysFramebuffers();
986
+
}
987
+
988
+
function initBloomFramebuffers() {
989
+
let res = getResolution(config.BLOOM_RESOLUTION);
990
+
991
+
const texType = ext.halfFloatTexType;
992
+
const rgba = ext.formatRGBA;
993
+
const filtering = ext.supportLinearFiltering ? gl.LINEAR : gl.NEAREST;
994
+
995
+
bloom = createFBO(res.width, res.height, rgba.internalFormat, rgba.format, texType, filtering);
996
+
997
+
bloomFramebuffers.length = 0;
998
+
for (let i = 0; i < config.BLOOM_ITERATIONS; i++) {
999
+
let width = res.width >> (i + 1);
1000
+
let height = res.height >> (i + 1);
1001
+
1002
+
if (width < 2 || height < 2) break;
1003
+
1004
+
let fbo = createFBO(width, height, rgba.internalFormat, rgba.format, texType, filtering);
1005
+
bloomFramebuffers.push(fbo);
1006
+
}
1007
+
}
1008
+
1009
+
function initSunraysFramebuffers() {
1010
+
let res = getResolution(config.SUNRAYS_RESOLUTION);
1011
+
1012
+
const texType = ext.halfFloatTexType;
1013
+
const r = ext.formatR;
1014
+
const filtering = ext.supportLinearFiltering ? gl.LINEAR : gl.NEAREST;
1015
+
1016
+
sunrays = createFBO(res.width, res.height, r.internalFormat, r.format, texType, filtering);
1017
+
sunraysTemp = createFBO(res.width, res.height, r.internalFormat, r.format, texType, filtering);
1018
+
}
1019
+
1020
+
function createFBO(w, h, internalFormat, format, type, param) {
1021
+
gl.activeTexture(gl.TEXTURE0);
1022
+
let texture = gl.createTexture();
1023
+
gl.bindTexture(gl.TEXTURE_2D, texture);
1024
+
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, param);
1025
+
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, param);
1026
+
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
1027
+
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
1028
+
gl.texImage2D(gl.TEXTURE_2D, 0, internalFormat, w, h, 0, format, type, null);
1029
+
1030
+
let fbo = gl.createFramebuffer();
1031
+
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
1032
+
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
1033
+
gl.viewport(0, 0, w, h);
1034
+
gl.clear(gl.COLOR_BUFFER_BIT);
1035
+
1036
+
let texelSizeX = 1.0 / w;
1037
+
let texelSizeY = 1.0 / h;
1038
+
1039
+
return {
1040
+
texture,
1041
+
fbo,
1042
+
width: w,
1043
+
height: h,
1044
+
texelSizeX,
1045
+
texelSizeY,
1046
+
attach(id) {
1047
+
gl.activeTexture(gl.TEXTURE0 + id);
1048
+
gl.bindTexture(gl.TEXTURE_2D, texture);
1049
+
return id;
1050
+
}
1051
+
};
1052
+
}
1053
+
1054
+
function createDoubleFBO(w, h, internalFormat, format, type, param) {
1055
+
let fbo1 = createFBO(w, h, internalFormat, format, type, param);
1056
+
let fbo2 = createFBO(w, h, internalFormat, format, type, param);
1057
+
1058
+
return {
1059
+
width: w,
1060
+
height: h,
1061
+
texelSizeX: fbo1.texelSizeX,
1062
+
texelSizeY: fbo1.texelSizeY,
1063
+
get read() {
1064
+
return fbo1;
1065
+
},
1066
+
set read(value) {
1067
+
fbo1 = value;
1068
+
},
1069
+
get write() {
1070
+
return fbo2;
1071
+
},
1072
+
set write(value) {
1073
+
fbo2 = value;
1074
+
},
1075
+
swap() {
1076
+
let temp = fbo1;
1077
+
fbo1 = fbo2;
1078
+
fbo2 = temp;
1079
+
}
1080
+
};
1081
+
}
1082
+
1083
+
function resizeFBO(target, w, h, internalFormat, format, type, param) {
1084
+
let newFBO = createFBO(w, h, internalFormat, format, type, param);
1085
+
copyProgram.bind();
1086
+
gl.uniform1i(copyProgram.uniforms.uTexture, target.attach(0));
1087
+
blit(newFBO);
1088
+
return newFBO;
1089
+
}
1090
+
1091
+
function resizeDoubleFBO(target, w, h, internalFormat, format, type, param) {
1092
+
if (target.width == w && target.height == h) return target;
1093
+
target.read = resizeFBO(target.read, w, h, internalFormat, format, type, param);
1094
+
target.write = createFBO(w, h, internalFormat, format, type, param);
1095
+
target.width = w;
1096
+
target.height = h;
1097
+
target.texelSizeX = 1.0 / w;
1098
+
target.texelSizeY = 1.0 / h;
1099
+
return target;
1100
+
}
1101
+
1102
+
function createTextureAsync(url) {
1103
+
let texture = gl.createTexture();
1104
+
gl.bindTexture(gl.TEXTURE_2D, texture);
1105
+
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
1106
+
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
1107
+
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT);
1108
+
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT);
1109
+
gl.texImage2D(
1110
+
gl.TEXTURE_2D,
1111
+
0,
1112
+
gl.RGB,
1113
+
1,
1114
+
1,
1115
+
0,
1116
+
gl.RGB,
1117
+
gl.UNSIGNED_BYTE,
1118
+
new Uint8Array([255, 255, 255])
1119
+
);
1120
+
1121
+
let obj = {
1122
+
texture,
1123
+
width: 1,
1124
+
height: 1,
1125
+
attach(id) {
1126
+
gl.activeTexture(gl.TEXTURE0 + id);
1127
+
gl.bindTexture(gl.TEXTURE_2D, texture);
1128
+
return id;
1129
+
}
1130
+
};
1131
+
1132
+
let image = new Image();
1133
+
image.onload = () => {
1134
+
obj.width = image.width;
1135
+
obj.height = image.height;
1136
+
gl.bindTexture(gl.TEXTURE_2D, texture);
1137
+
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB, gl.RGB, gl.UNSIGNED_BYTE, image);
1138
+
};
1139
+
image.src = url;
1140
+
1141
+
return obj;
1142
+
}
1143
+
1144
+
function updateKeywords() {
1145
+
let displayKeywords = [];
1146
+
if (config.SHADING) displayKeywords.push('SHADING');
1147
+
if (config.BLOOM) displayKeywords.push('BLOOM');
1148
+
if (config.SUNRAYS) displayKeywords.push('SUNRAYS');
1149
+
displayMaterial.setKeywords(displayKeywords);
1150
+
}
1151
+
1152
+
updateKeywords();
1153
+
initFramebuffers();
1154
+
multipleSplats(parseInt(Math.random() * 20) + 5);
1155
+
1156
+
let lastUpdateTime = Date.now();
1157
+
let colorUpdateTimer = 0.0;
1158
+
update();
1159
+
1160
+
function update() {
1161
+
const dt = calcDeltaTime() * (config.RENDER_SPEED ?? 1.0);
1162
+
if (resizeCanvas()) initFramebuffers();
1163
+
updateColors(dt);
1164
+
applyInputs();
1165
+
if (!config.PAUSED) step(dt);
1166
+
render(null);
1167
+
requestAnimationFrame(update);
1168
+
}
1169
+
1170
+
function calcDeltaTime() {
1171
+
let now = Date.now();
1172
+
let dt = (now - lastUpdateTime) / 1000;
1173
+
dt = Math.min(dt, 0.016666);
1174
+
lastUpdateTime = now;
1175
+
return dt;
1176
+
}
1177
+
1178
+
function resizeCanvas() {
1179
+
let width = scaleByPixelRatio(canvas.clientWidth);
1180
+
let height = scaleByPixelRatio(canvas.clientHeight);
1181
+
if (canvas.width != width || canvas.height != height) {
1182
+
canvas.width = width;
1183
+
canvas.height = height;
1184
+
return true;
1185
+
}
1186
+
return false;
1187
+
}
1188
+
1189
+
function updateColors(dt) {
1190
+
if (!config.COLORFUL) return;
1191
+
1192
+
colorUpdateTimer += dt * config.COLOR_UPDATE_SPEED;
1193
+
if (colorUpdateTimer >= 1) {
1194
+
colorUpdateTimer = wrap(colorUpdateTimer, 0, 1);
1195
+
pointers.forEach((p) => {
1196
+
p.color = generateColor();
1197
+
});
1198
+
}
1199
+
}
1200
+
1201
+
function applyInputs() {
1202
+
if (splatStack.length > 0) multipleSplats(splatStack.pop());
1203
+
1204
+
pointers.forEach((p) => {
1205
+
if (p.moved) {
1206
+
p.moved = false;
1207
+
splatPointer(p);
1208
+
}
1209
+
});
1210
+
}
1211
+
1212
+
function step(dt) {
1213
+
gl.disable(gl.BLEND);
1214
+
1215
+
curlProgram.bind();
1216
+
gl.uniform2f(curlProgram.uniforms.texelSize, velocity.texelSizeX, velocity.texelSizeY);
1217
+
gl.uniform1i(curlProgram.uniforms.uVelocity, velocity.read.attach(0));
1218
+
blit(curl);
1219
+
1220
+
vorticityProgram.bind();
1221
+
gl.uniform2f(vorticityProgram.uniforms.texelSize, velocity.texelSizeX, velocity.texelSizeY);
1222
+
gl.uniform1i(vorticityProgram.uniforms.uVelocity, velocity.read.attach(0));
1223
+
gl.uniform1i(vorticityProgram.uniforms.uCurl, curl.attach(1));
1224
+
gl.uniform1f(vorticityProgram.uniforms.curl, config.CURL);
1225
+
gl.uniform1f(vorticityProgram.uniforms.dt, dt);
1226
+
blit(velocity.write);
1227
+
velocity.swap();
1228
+
1229
+
divergenceProgram.bind();
1230
+
gl.uniform2f(divergenceProgram.uniforms.texelSize, velocity.texelSizeX, velocity.texelSizeY);
1231
+
gl.uniform1i(divergenceProgram.uniforms.uVelocity, velocity.read.attach(0));
1232
+
blit(divergence);
1233
+
1234
+
clearProgram.bind();
1235
+
gl.uniform1i(clearProgram.uniforms.uTexture, pressure.read.attach(0));
1236
+
gl.uniform1f(clearProgram.uniforms.value, config.PRESSURE);
1237
+
blit(pressure.write);
1238
+
pressure.swap();
1239
+
1240
+
pressureProgram.bind();
1241
+
gl.uniform2f(pressureProgram.uniforms.texelSize, velocity.texelSizeX, velocity.texelSizeY);
1242
+
gl.uniform1i(pressureProgram.uniforms.uDivergence, divergence.attach(0));
1243
+
for (let i = 0; i < config.PRESSURE_ITERATIONS; i++) {
1244
+
gl.uniform1i(pressureProgram.uniforms.uPressure, pressure.read.attach(1));
1245
+
blit(pressure.write);
1246
+
pressure.swap();
1247
+
}
1248
+
1249
+
gradienSubtractProgram.bind();
1250
+
gl.uniform2f(gradienSubtractProgram.uniforms.texelSize, velocity.texelSizeX, velocity.texelSizeY);
1251
+
gl.uniform1i(gradienSubtractProgram.uniforms.uPressure, pressure.read.attach(0));
1252
+
gl.uniform1i(gradienSubtractProgram.uniforms.uVelocity, velocity.read.attach(1));
1253
+
blit(velocity.write);
1254
+
velocity.swap();
1255
+
1256
+
advectionProgram.bind();
1257
+
gl.uniform2f(advectionProgram.uniforms.texelSize, velocity.texelSizeX, velocity.texelSizeY);
1258
+
if (!ext.supportLinearFiltering)
1259
+
gl.uniform2f(advectionProgram.uniforms.dyeTexelSize, velocity.texelSizeX, velocity.texelSizeY);
1260
+
let velocityId = velocity.read.attach(0);
1261
+
gl.uniform1i(advectionProgram.uniforms.uVelocity, velocityId);
1262
+
gl.uniform1i(advectionProgram.uniforms.uSource, velocityId);
1263
+
gl.uniform1f(advectionProgram.uniforms.dt, dt);
1264
+
gl.uniform1f(advectionProgram.uniforms.dissipation, config.VELOCITY_DISSIPATION);
1265
+
blit(velocity.write);
1266
+
velocity.swap();
1267
+
1268
+
if (!ext.supportLinearFiltering)
1269
+
gl.uniform2f(advectionProgram.uniforms.dyeTexelSize, dye.texelSizeX, dye.texelSizeY);
1270
+
gl.uniform1i(advectionProgram.uniforms.uVelocity, velocity.read.attach(0));
1271
+
gl.uniform1i(advectionProgram.uniforms.uSource, dye.read.attach(1));
1272
+
gl.uniform1f(advectionProgram.uniforms.dissipation, config.DENSITY_DISSIPATION);
1273
+
blit(dye.write);
1274
+
dye.swap();
1275
+
}
1276
+
1277
+
function render(target) {
1278
+
if (config.BLOOM) applyBloom(dye.read, bloom);
1279
+
if (config.SUNRAYS) {
1280
+
applySunrays(dye.read, dye.write, sunrays);
1281
+
blur(sunrays, sunraysTemp, 1);
1282
+
}
1283
+
1284
+
if (target == null || !config.TRANSPARENT) {
1285
+
gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA);
1286
+
gl.enable(gl.BLEND);
1287
+
} else {
1288
+
gl.disable(gl.BLEND);
1289
+
}
1290
+
1291
+
if (!config.TRANSPARENT) drawColor(target, normalizeColor(config.BACK_COLOR));
1292
+
if (target == null && config.TRANSPARENT) drawCheckerboard(target);
1293
+
drawDisplay(target);
1294
+
}
1295
+
1296
+
function drawColor(target, color) {
1297
+
colorProgram.bind();
1298
+
gl.uniform4f(colorProgram.uniforms.color, color.r, color.g, color.b, 1);
1299
+
blit(target);
1300
+
}
1301
+
1302
+
function drawCheckerboard(target) {
1303
+
checkerboardProgram.bind();
1304
+
gl.uniform1f(checkerboardProgram.uniforms.aspectRatio, canvas.width / canvas.height);
1305
+
blit(target);
1306
+
}
1307
+
1308
+
function drawDisplay(target) {
1309
+
let width = target == null ? gl.drawingBufferWidth : target.width;
1310
+
let height = target == null ? gl.drawingBufferHeight : target.height;
1311
+
1312
+
displayMaterial.bind();
1313
+
if (config.SHADING) gl.uniform2f(displayMaterial.uniforms.texelSize, 1.0 / width, 1.0 / height);
1314
+
gl.uniform1i(displayMaterial.uniforms.uTexture, dye.read.attach(0));
1315
+
if (config.BLOOM) {
1316
+
gl.uniform1i(displayMaterial.uniforms.uBloom, bloom.attach(1));
1317
+
gl.uniform1i(displayMaterial.uniforms.uDithering, ditheringTexture.attach(2));
1318
+
let scale = getTextureScale(ditheringTexture, width, height);
1319
+
gl.uniform2f(displayMaterial.uniforms.ditherScale, scale.x, scale.y);
1320
+
}
1321
+
if (config.SUNRAYS) gl.uniform1i(displayMaterial.uniforms.uSunrays, sunrays.attach(3));
1322
+
blit(target);
1323
+
}
1324
+
1325
+
function applyBloom(source, destination) {
1326
+
if (bloomFramebuffers.length < 2) return;
1327
+
1328
+
let last = destination;
1329
+
1330
+
gl.disable(gl.BLEND);
1331
+
bloomPrefilterProgram.bind();
1332
+
let knee = config.BLOOM_THRESHOLD * config.BLOOM_SOFT_KNEE + 0.0001;
1333
+
let curve0 = config.BLOOM_THRESHOLD - knee;
1334
+
let curve1 = knee * 2;
1335
+
let curve2 = 0.25 / knee;
1336
+
gl.uniform3f(bloomPrefilterProgram.uniforms.curve, curve0, curve1, curve2);
1337
+
gl.uniform1f(bloomPrefilterProgram.uniforms.threshold, config.BLOOM_THRESHOLD);
1338
+
gl.uniform1i(bloomPrefilterProgram.uniforms.uTexture, source.attach(0));
1339
+
blit(last);
1340
+
1341
+
bloomBlurProgram.bind();
1342
+
for (let i = 0; i < bloomFramebuffers.length; i++) {
1343
+
let dest = bloomFramebuffers[i];
1344
+
gl.uniform2f(bloomBlurProgram.uniforms.texelSize, last.texelSizeX, last.texelSizeY);
1345
+
gl.uniform1i(bloomBlurProgram.uniforms.uTexture, last.attach(0));
1346
+
blit(dest);
1347
+
last = dest;
1348
+
}
1349
+
1350
+
gl.blendFunc(gl.ONE, gl.ONE);
1351
+
gl.enable(gl.BLEND);
1352
+
1353
+
for (let i = bloomFramebuffers.length - 2; i >= 0; i--) {
1354
+
let baseTex = bloomFramebuffers[i];
1355
+
gl.uniform2f(bloomBlurProgram.uniforms.texelSize, last.texelSizeX, last.texelSizeY);
1356
+
gl.uniform1i(bloomBlurProgram.uniforms.uTexture, last.attach(0));
1357
+
gl.viewport(0, 0, baseTex.width, baseTex.height);
1358
+
blit(baseTex);
1359
+
last = baseTex;
1360
+
}
1361
+
1362
+
gl.disable(gl.BLEND);
1363
+
bloomFinalProgram.bind();
1364
+
gl.uniform2f(bloomFinalProgram.uniforms.texelSize, last.texelSizeX, last.texelSizeY);
1365
+
gl.uniform1i(bloomFinalProgram.uniforms.uTexture, last.attach(0));
1366
+
gl.uniform1f(bloomFinalProgram.uniforms.intensity, config.BLOOM_INTENSITY);
1367
+
blit(destination);
1368
+
}
1369
+
1370
+
function applySunrays(source, mask, destination) {
1371
+
gl.disable(gl.BLEND);
1372
+
sunraysMaskProgram.bind();
1373
+
gl.uniform1i(sunraysMaskProgram.uniforms.uTexture, source.attach(0));
1374
+
blit(mask);
1375
+
1376
+
sunraysProgram.bind();
1377
+
gl.uniform1f(sunraysProgram.uniforms.weight, config.SUNRAYS_WEIGHT);
1378
+
gl.uniform1i(sunraysProgram.uniforms.uTexture, mask.attach(0));
1379
+
blit(destination);
1380
+
}
1381
+
1382
+
function blur(target, temp, iterations) {
1383
+
blurProgram.bind();
1384
+
for (let i = 0; i < iterations; i++) {
1385
+
gl.uniform2f(blurProgram.uniforms.texelSize, target.texelSizeX, 0.0);
1386
+
gl.uniform1i(blurProgram.uniforms.uTexture, target.attach(0));
1387
+
blit(temp);
1388
+
1389
+
gl.uniform2f(blurProgram.uniforms.texelSize, 0.0, target.texelSizeY);
1390
+
gl.uniform1i(blurProgram.uniforms.uTexture, temp.attach(0));
1391
+
blit(target);
1392
+
}
1393
+
}
1394
+
1395
+
function splatPointer(pointer) {
1396
+
let dx = pointer.deltaX * config.SPLAT_FORCE;
1397
+
let dy = pointer.deltaY * config.SPLAT_FORCE;
1398
+
splat(pointer.texcoordX, pointer.texcoordY, dx, dy, pointer.color);
1399
+
}
1400
+
1401
+
function multipleSplats(amount) {
1402
+
for (let i = 0; i < amount; i++) {
1403
+
const color = generateColor();
1404
+
color.r *= 10.0;
1405
+
color.g *= 10.0;
1406
+
color.b *= 10.0;
1407
+
const x = Math.random();
1408
+
const y = Math.random() < 0.5 ? 1 : 0.3;
1409
+
const dx = 100 * (Math.random() - 0.5);
1410
+
const dy = 1000 * (Math.random() - 0.5);
1411
+
splat(x, y, dx, dy, color);
1412
+
}
1413
+
}
1414
+
1415
+
function splat(x, y, dx, dy, color) {
1416
+
splatProgram.bind();
1417
+
gl.uniform1i(splatProgram.uniforms.uTarget, velocity.read.attach(0));
1418
+
gl.uniform1f(splatProgram.uniforms.aspectRatio, canvas.width / canvas.height);
1419
+
gl.uniform2f(splatProgram.uniforms.point, x, y);
1420
+
gl.uniform3f(splatProgram.uniforms.color, dx, dy, 0.0);
1421
+
gl.uniform1f(splatProgram.uniforms.radius, correctRadius(config.SPLAT_RADIUS / 100.0));
1422
+
blit(velocity.write);
1423
+
velocity.swap();
1424
+
1425
+
gl.uniform1i(splatProgram.uniforms.uTarget, dye.read.attach(0));
1426
+
gl.uniform3f(splatProgram.uniforms.color, color.r, color.g, color.b);
1427
+
blit(dye.write);
1428
+
dye.swap();
1429
+
}
1430
+
1431
+
function correctRadius(radius) {
1432
+
let aspectRatio = canvas.width / canvas.height;
1433
+
if (aspectRatio > 1) radius *= aspectRatio;
1434
+
return radius;
1435
+
}
1436
+
1437
+
canvas.addEventListener('pointerdown', (e) => {
1438
+
let posX = scaleByPixelRatio(e.offsetX);
1439
+
let posY = scaleByPixelRatio(e.offsetY);
1440
+
let pointer = pointers.find((p) => p.id == -1);
1441
+
if (pointer == null) pointer = new PointerPrototype();
1442
+
updatePointerDownData(pointer, -1, posX, posY);
1443
+
});
1444
+
1445
+
document.body.addEventListener('pointermove', (e) => {
1446
+
let pointer = pointers[0];
1447
+
// if (!pointer.down) return;
1448
+
let posX = scaleByPixelRatio(e.offsetX);
1449
+
let posY = scaleByPixelRatio(e.offsetY);
1450
+
updatePointerMoveData(pointer, posX, posY);
1451
+
});
1452
+
1453
+
window.addEventListener('pointerup', () => {
1454
+
updatePointerUpData(pointers[0]);
1455
+
});
1456
+
1457
+
// canvas.addEventListener('touchstart', (e) => {
1458
+
// e.preventDefault();
1459
+
// const touches = e.targetTouches;
1460
+
// while (touches.length >= pointers.length) pointers.push(new PointerPrototype());
1461
+
// for (let i = 0; i < touches.length; i++) {
1462
+
// let posX = scaleByPixelRatio(touches[i].pageX);
1463
+
// let posY = scaleByPixelRatio(touches[i].pageY);
1464
+
// updatePointerDownData(pointers[i + 1], touches[i].identifier, posX, posY);
1465
+
// }
1466
+
// });
1467
+
1468
+
// canvas.addEventListener(
1469
+
// 'touchmove',
1470
+
// (e) => {
1471
+
// e.preventDefault();
1472
+
// const touches = e.targetTouches;
1473
+
// for (let i = 0; i < touches.length; i++) {
1474
+
// let pointer = pointers[i + 1];
1475
+
// if (!pointer.down) continue;
1476
+
// let posX = scaleByPixelRatio(touches[i].pageX);
1477
+
// let posY = scaleByPixelRatio(touches[i].pageY);
1478
+
// updatePointerMoveData(pointer, posX, posY);
1479
+
// }
1480
+
// },
1481
+
// false
1482
+
// );
1483
+
1484
+
// window.addEventListener('touchend', (e) => {
1485
+
// const touches = e.changedTouches;
1486
+
// for (let i = 0; i < touches.length; i++) {
1487
+
// let pointer = pointers.find((p) => p.id == touches[i].identifier);
1488
+
// if (pointer == null) continue;
1489
+
// updatePointerUpData(pointer);
1490
+
// }
1491
+
// });
1492
+
1493
+
// window.addEventListener('keydown', (e) => {
1494
+
// if (e.code === 'KeyP') config.PAUSED = !config.PAUSED;
1495
+
// if (e.key === ' ') splatStack.push(parseInt(Math.random() * 20) + 5);
1496
+
// });
1497
+
1498
+
function updatePointerDownData(pointer, id, posX, posY) {
1499
+
pointer.id = id;
1500
+
pointer.down = true;
1501
+
pointer.moved = false;
1502
+
pointer.texcoordX = posX / canvas.width;
1503
+
pointer.texcoordY = 1.0 - posY / canvas.height;
1504
+
pointer.prevTexcoordX = pointer.texcoordX;
1505
+
pointer.prevTexcoordY = pointer.texcoordY;
1506
+
pointer.deltaX = 0;
1507
+
pointer.deltaY = 0;
1508
+
pointer.color = generateColor();
1509
+
}
1510
+
1511
+
function updatePointerMoveData(pointer, posX, posY) {
1512
+
pointer.prevTexcoordX = pointer.texcoordX;
1513
+
pointer.prevTexcoordY = pointer.texcoordY;
1514
+
pointer.texcoordX = posX / canvas.width;
1515
+
pointer.texcoordY = 1.0 - posY / canvas.height;
1516
+
pointer.deltaX = correctDeltaX(pointer.texcoordX - pointer.prevTexcoordX);
1517
+
pointer.deltaY = correctDeltaY(pointer.texcoordY - pointer.prevTexcoordY);
1518
+
pointer.moved = Math.abs(pointer.deltaX) > 0 || Math.abs(pointer.deltaY) > 0;
1519
+
}
1520
+
1521
+
function updatePointerUpData(pointer) {
1522
+
pointer.down = false;
1523
+
}
1524
+
1525
+
function correctDeltaX(delta) {
1526
+
let aspectRatio = canvas.width / canvas.height;
1527
+
if (aspectRatio < 1) delta *= aspectRatio;
1528
+
return delta;
1529
+
}
1530
+
1531
+
function correctDeltaY(delta) {
1532
+
let aspectRatio = canvas.width / canvas.height;
1533
+
if (aspectRatio > 1) delta /= aspectRatio;
1534
+
return delta;
1535
+
}
1536
+
1537
+
function generateColor() {
1538
+
let c = HSVtoRGB(Math.random() * (config.END_HUE - config.START_HUE) + config.START_HUE, 1.0, 1.0);
1539
+
c.r *= 0.15;
1540
+
c.g *= 0.15;
1541
+
c.b *= 0.15;
1542
+
return c;
1543
+
}
1544
+
1545
+
function HSVtoRGB(h, s, v) {
1546
+
let r, g, b, i, f, p, q, t;
1547
+
i = Math.floor(h * 6);
1548
+
f = h * 6 - i;
1549
+
p = v * (1 - s);
1550
+
q = v * (1 - f * s);
1551
+
t = v * (1 - (1 - f) * s);
1552
+
1553
+
switch (i % 6) {
1554
+
case 0:
1555
+
(r = v), (g = t), (b = p);
1556
+
break;
1557
+
case 1:
1558
+
(r = q), (g = v), (b = p);
1559
+
break;
1560
+
case 2:
1561
+
(r = p), (g = v), (b = t);
1562
+
break;
1563
+
case 3:
1564
+
(r = p), (g = q), (b = v);
1565
+
break;
1566
+
case 4:
1567
+
(r = t), (g = p), (b = v);
1568
+
break;
1569
+
case 5:
1570
+
(r = v), (g = p), (b = q);
1571
+
break;
1572
+
}
1573
+
1574
+
return {
1575
+
r,
1576
+
g,
1577
+
b
1578
+
};
1579
+
}
1580
+
1581
+
function normalizeColor(input) {
1582
+
let output = {
1583
+
r: input.r / 255,
1584
+
g: input.g / 255,
1585
+
b: input.b / 255
1586
+
};
1587
+
return output;
1588
+
}
1589
+
1590
+
function wrap(value, min, max) {
1591
+
let range = max - min;
1592
+
if (range == 0) return min;
1593
+
return ((value - min) % range) + min;
1594
+
}
1595
+
1596
+
function getResolution(resolution) {
1597
+
let aspectRatio = gl.drawingBufferWidth / gl.drawingBufferHeight;
1598
+
if (aspectRatio < 1) aspectRatio = 1.0 / aspectRatio;
1599
+
1600
+
let min = Math.round(resolution);
1601
+
let max = Math.round(resolution * aspectRatio);
1602
+
1603
+
if (gl.drawingBufferWidth > gl.drawingBufferHeight) return { width: max, height: min };
1604
+
else return { width: min, height: max };
1605
+
}
1606
+
1607
+
function getTextureScale(texture, width, height) {
1608
+
return {
1609
+
x: width / texture.width,
1610
+
y: height / texture.height
1611
+
};
1612
+
}
1613
+
1614
+
function scaleByPixelRatio(input) {
1615
+
let pixelRatio = window.devicePixelRatio || 1;
1616
+
return Math.floor(input * pixelRatio);
1617
+
}
1618
+
1619
+
function hashCode(s) {
1620
+
if (s.length == 0) return 0;
1621
+
let hash = 0;
1622
+
for (let i = 0; i < s.length; i++) {
1623
+
hash = (hash << 5) - hash + s.charCodeAt(i);
1624
+
hash |= 0; // Convert to 32bit integer
1625
+
}
1626
+
return hash;
1627
+
}
1628
+
1629
+
1630
+
setInterval(() => {
1631
+
multipleSplats(5);
1632
+
}, 500)