├── static └── js │ └── .gitkeep ├── .eslintignore ├── .gitignore ├── screenshot.png ├── webpack.prod.js ├── src ├── ts │ ├── shader.d.ts │ ├── flipper.ts │ └── index.ts └── glsl │ ├── triangles.vert │ ├── rendercells.frag │ ├── rendertexture.frag │ ├── rendercells.vert │ ├── deposit.frag │ └── life.frag ├── webpack.dev.js ├── index.html ├── tsconfig.json ├── webpack.common.js ├── .eslintrc.json ├── package.json ├── README.md └── LICENSE.md /static/js/.gitkeep: -------------------------------------------------------------------------------- 1 | -------------------------------------------------------------------------------- /.eslintignore: -------------------------------------------------------------------------------- 1 | static/js/*.generated.js 2 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules 2 | .vscode 3 | static/js/*.generated.js 4 | -------------------------------------------------------------------------------- /screenshot.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ollien/slime-mold/HEAD/screenshot.png -------------------------------------------------------------------------------- /webpack.prod.js: -------------------------------------------------------------------------------- 1 | const common = require('./webpack.common.js'); 2 | 3 | module.exports = common; 4 | -------------------------------------------------------------------------------- /src/ts/shader.d.ts: -------------------------------------------------------------------------------- 1 | declare module '@shader/*' { 2 | const value: string; 3 | export default value; 4 | } 5 | -------------------------------------------------------------------------------- /src/glsl/triangles.vert: -------------------------------------------------------------------------------- 1 | attribute vec2 a_position; 2 | 3 | void main() { 4 | gl_Position = vec4(a_position, 0., 1.); 5 | } 6 | -------------------------------------------------------------------------------- /src/glsl/rendercells.frag: -------------------------------------------------------------------------------- 1 | #ifdef GL_ES 2 | precision mediump float; 3 | #endif 4 | 5 | void main() { 6 | gl_FragColor = vec4(1.); 7 | } 8 | -------------------------------------------------------------------------------- /webpack.dev.js: -------------------------------------------------------------------------------- 1 | const merge = require('webpack-merge'); // eslint-disable-line import/no-extraneous-dependencies 2 | const common = require('./webpack.common.js'); 3 | 4 | module.exports = merge(common, { 5 | devtool: 'eval-source-map', 6 | }); 7 | -------------------------------------------------------------------------------- /src/glsl/rendertexture.frag: -------------------------------------------------------------------------------- 1 | #ifdef GL_ES 2 | precision mediump float; 3 | #endif 4 | 5 | uniform vec2 resolution; 6 | uniform vec3 color; 7 | uniform sampler2D luma_texture; 8 | 9 | void main() { 10 | vec2 p = gl_FragCoord.xy/resolution; 11 | 12 | gl_FragColor = vec4(color/255. * texture2D(luma_texture, p).rgb, 1.0); 13 | } 14 | -------------------------------------------------------------------------------- /index.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | Slime Mold Simulation 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | -------------------------------------------------------------------------------- /tsconfig.json: -------------------------------------------------------------------------------- 1 | { 2 | "compilerOptions": { 3 | "baseUrl": "./src/ts", 4 | "module": "ES6", 5 | "sourceMap": true, 6 | "moduleResolution": "node", 7 | "lib": [ 8 | "DOM", 9 | "DOM.Iterable", 10 | "ES2015", 11 | "ScriptHost" 12 | ], 13 | "esModuleInterop": true 14 | }, 15 | "include": [ 16 | "src/ts/*.ts", 17 | ] 18 | } 19 | -------------------------------------------------------------------------------- /src/glsl/rendercells.vert: -------------------------------------------------------------------------------- 1 | #ifdef GL_ES 2 | precision highp float; 3 | #endif 4 | 5 | attribute vec2 a_position; 6 | uniform sampler2D simulation_texture; 7 | 8 | void main() { 9 | vec2 cell = texture2D(simulation_texture, a_position).rg; 10 | // Vertex shaders must be from -1 to 1, but our positions are from to 0 to 1 11 | cell = cell * 2. - vec2(1.); 12 | 13 | // Render the cell at the position it told us it's at. 14 | gl_Position = vec4(cell, 0., 1.); 15 | gl_PointSize = 1.; 16 | } 17 | -------------------------------------------------------------------------------- /webpack.common.js: -------------------------------------------------------------------------------- 1 | module.exports = { 2 | entry: { 3 | index: ['./src/ts/index.ts'], 4 | }, 5 | output: { 6 | filename: '[name].generated.js', 7 | path: `${__dirname}/static/js`, 8 | }, 9 | module: { 10 | rules: [ 11 | { 12 | test: /\.ts$/, 13 | use: 'ts-loader', 14 | exclude: /node_modules/, 15 | }, 16 | { 17 | test: /\.(glsl|vert|frag)$/, 18 | use: [ 19 | 'raw-loader', 20 | 'glslify-loader', 21 | ], 22 | exclude: /node_modules/, 23 | }, 24 | ], 25 | }, 26 | resolve: { 27 | extensions: ['.wasm', '.mjs', '.js', '.ts', '.json', '.frag', '.vert'], 28 | alias: { 29 | '@shader': `${__dirname}/src/glsl/`, 30 | }, 31 | }, 32 | }; 33 | -------------------------------------------------------------------------------- /src/ts/flipper.ts: -------------------------------------------------------------------------------- 1 | /** 2 | * Allows one to flip between a "front" and "back" object 3 | */ 4 | export class Flipper { 5 | private sides: Array 6 | 7 | /** 8 | * 9 | * @param front The object to start with (i.e. the first one to be returned from flip()) 10 | * @param back The object ot end with (i.e. the second to be returned from flip()) 11 | */ 12 | constructor(front: T, back: T) { 13 | this.sides = [front, back]; 14 | } 15 | 16 | /** 17 | * Flip front and back, then return what was currently the "front" 18 | */ 19 | flip(): T { 20 | const current = this.sides[0]; 21 | this.sides.reverse(); 22 | 23 | return current; 24 | } 25 | 26 | /** 27 | * Peek the front without flipping. 28 | */ 29 | peekFront(): T { 30 | return this.sides[0]; 31 | } 32 | 33 | /** 34 | * Peek the back without flipping. 35 | */ 36 | peekBack(): T { 37 | return this.sides[1]; 38 | } 39 | } 40 | -------------------------------------------------------------------------------- /src/glsl/deposit.frag: -------------------------------------------------------------------------------- 1 | #ifdef GL_ES 2 | precision mediump float; 3 | #endif 4 | 5 | #define FEEDBACK_AMOUNT 0.925 6 | #define BLUR_RADIUS 5. 7 | 8 | uniform vec2 resolution; 9 | uniform sampler2D cell_texture; 10 | uniform sampler2D feedback_texture; 11 | 12 | /** 13 | * Perform a small blur effect by averaging points around the given point. 14 | */ 15 | vec3 get_with_diffuse(sampler2D texture, vec2 pos) { 16 | vec3 color = vec3(0.); 17 | for (float i = -BLUR_RADIUS; i <= BLUR_RADIUS; i++) { 18 | for (float j = -BLUR_RADIUS; j <= BLUR_RADIUS; j++) { 19 | color += texture2D(texture, pos + vec2(i, j)/resolution).rgb; 20 | } 21 | } 22 | 23 | return color / pow(BLUR_RADIUS * 2. + 1., 2.); 24 | } 25 | 26 | 27 | void main() { 28 | vec2 p = gl_FragCoord.xy / resolution; 29 | vec3 cell = texture2D(cell_texture, p).rgb; 30 | vec3 old_deposit = get_with_diffuse(feedback_texture, p).rgb; 31 | 32 | gl_FragColor = vec4(cell + FEEDBACK_AMOUNT * old_deposit, 1.); 33 | } 34 | -------------------------------------------------------------------------------- /.eslintrc.json: -------------------------------------------------------------------------------- 1 | { 2 | "env": { 3 | "browser": true, 4 | "es6": true 5 | }, 6 | "extends": [ 7 | "airbnb-base" 8 | ], 9 | "globals": { 10 | "Atomics": "readonly", 11 | "SharedArrayBuffer": "readonly" 12 | }, 13 | "parser": "@typescript-eslint/parser", 14 | "parserOptions": { 15 | "ecmaVersion": 2018, 16 | "sourceType": "module" 17 | }, 18 | "plugins": [ 19 | "@typescript-eslint" 20 | ], 21 | "rules": { 22 | "no-tabs": 0, 23 | "indent": ["error", "tab"], 24 | "no-plusplus": 0, 25 | "no-console": "off", 26 | "lines-between-class-members": "off", 27 | "import/extensions": "off", 28 | "import/prefer-default-export": "off", 29 | "max-len": ["error", {"code": 120}], 30 | "no-bitwise": "off" 31 | }, 32 | "settings": { 33 | "import/resolver": { 34 | "node": { 35 | "extensions": [".js", ".ts"] 36 | } 37 | } 38 | } 39 | } 40 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "cs-420x-assignment-3", 3 | "version": "0.1.0", 4 | "description": "Slime Mold Simulation", 5 | "scripts": { 6 | "build": "webpack --config webpack.prod.js", 7 | "start": "npm run web-server && webpack --watch --config webpack.dev.js", 8 | "web-server": "http-server -a 127.0.0.1 -p 8000 ./ &" 9 | }, 10 | "author": "ollien", 11 | "dependencies": { 12 | "@types/dat.gui": "^0.7.5", 13 | "dat.gui": "^0.7.6", 14 | "glsl-random": "0.0.5", 15 | "lodash": "^4.17.15", 16 | "regl": "^1.3.13" 17 | }, 18 | "devDependencies": { 19 | "@types/lodash": "^4.14.149", 20 | "@typescript-eslint/eslint-plugin": "^2.19.2", 21 | "@typescript-eslint/parser": "^2.19.2", 22 | "eslint": "^6.8.0", 23 | "eslint-config-airbnb-base": "^14.0.0", 24 | "eslint-plugin-import": "^2.20.1", 25 | "glslify": "^7.0.0", 26 | "glslify-loader": "^2.0.0", 27 | "http-server": "^0.12.1", 28 | "raw-loader": "^4.0.0", 29 | "ts-loader": "^6.2.1", 30 | "typescript": "^3.7.5", 31 | "webpack": "^4.41.6", 32 | "webpack-cli": "^3.3.11", 33 | "webpack-merge": "^4.2.2" 34 | } 35 | } 36 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Slime Mold: CS420X Assignment 3 2 | 3 | Slime Mold (physarum) simulation. Based on [this blog post](https://sagejenson.com/physarum) and [this paper](https://uwe-repository.worktribe.com/output/980579). Inspiration for the implementation was sourced from [this blog post](https://kaesve.nl/projects/mold/summary.html). 4 | 5 | [Demo](https://ollien.github.io/slime-mold/) 6 | 7 | If you get poor performance with the demo, shrink your window and/or zoom in. This shader renders about 622k particles on a 1080p screen, so performance can suffer on some systems. 8 | 9 | ![Image of the simulation](https://raw.githubusercontent.com/ollien/slime-mold/master/screenshot.png?token=AAHOR72ED77AIEZUUPMKXC26LCBN4) 10 | 11 | ## Controls 12 | Parameters of the simulation, which are described in the paper, can be adjusted in a GUI within the simulation. Further, dragging within the simulation will "disturb" the mold, allowing you to cut through it. Holding shift while you do this will bring some mold closer to your cursor. 13 | 14 | ## Installation 15 | 16 | To run the development server, run. 17 | ``` 18 | npm install 19 | npm start 20 | ``` 21 | If you just wish to build the static files and host this on your own webserver, you can run 22 | ``` 23 | npm run-script build 24 | ``` 25 | -------------------------------------------------------------------------------- /src/glsl/life.frag: -------------------------------------------------------------------------------- 1 | #ifdef GL_ES 2 | precision highp float; 3 | #endif 4 | 5 | #define PI 3.14159 6 | 7 | #pragma glslify: random = require(glsl-random) 8 | 9 | uniform float step_size; 10 | uniform float sensor_distance_multiplier; 11 | uniform float sensor_angle_deg; 12 | uniform float rotate_angle_deg; 13 | uniform vec2 mouse_drag_position; 14 | uniform float disturb_radius; 15 | uniform bool paused; 16 | uniform bool pull_inwards; 17 | 18 | uniform vec2 resolution; 19 | uniform sampler2D simulation_texture; 20 | uniform sampler2D deposit_texture; 21 | 22 | vec4 get_simulation_value(vec2 coords) { 23 | return texture2D(simulation_texture, coords); 24 | } 25 | 26 | float get_deposit_value(vec2 coords) { 27 | return length(texture2D(deposit_texture, mod(coords, 1.)).rgb); 28 | } 29 | 30 | float relative_angle_to_rads(float angle) { 31 | return 2. * PI * angle; 32 | } 33 | 34 | float degrees_to_rads(float angle) { 35 | return angle / 180. * PI; 36 | } 37 | 38 | /** 39 | * Get the offset a cell will move in one step moving at the given angle (which must be in radians). 40 | */ 41 | vec2 get_position_offset_from_angle(vec2 position, float angle) { 42 | vec2 step_coeff = vec2(step_size)/resolution; 43 | 44 | return step_coeff * vec2(cos(angle), sin(angle)); 45 | } 46 | 47 | /** 48 | * Get the angle for the cell to move to after observing all of the sensors. 49 | */ 50 | float get_movement_angle(vec2 current_position, float current_angle) { 51 | float sensor_angle = degrees_to_rads(sensor_angle_deg); 52 | float rotate_angle = degrees_to_rads(rotate_angle_deg); 53 | vec2 forward_sensor_pos = current_position + sensor_distance_multiplier * get_position_offset_from_angle(current_position, current_angle); 54 | vec2 left_sensor_pos = current_position + sensor_distance_multiplier * get_position_offset_from_angle(current_position, current_angle - sensor_angle); 55 | vec2 right_sensor_pos = current_position + sensor_distance_multiplier * get_position_offset_from_angle(current_position, current_angle + sensor_angle); 56 | float forward_sensor_value = get_deposit_value(forward_sensor_pos); 57 | float left_sensor_value = get_deposit_value(left_sensor_pos); 58 | float right_sensor_value = get_deposit_value(right_sensor_pos); 59 | 60 | if (forward_sensor_value > left_sensor_value && forward_sensor_value > right_sensor_value) { 61 | return current_angle; 62 | } else if (forward_sensor_value < left_sensor_value && forward_sensor_value < right_sensor_value) { 63 | // Randomly add or subtract ROTATION_ANGLE 64 | return (2. * step(0.5, random(gl_FragCoord.xy/resolution)) - 1.) * current_angle * rotate_angle; 65 | } else if (left_sensor_value < right_sensor_value) { 66 | return current_angle + rotate_angle; 67 | } else if (left_sensor_value > right_sensor_value) { 68 | return current_angle - rotate_angle; 69 | } else { 70 | return 0.; 71 | } 72 | } 73 | 74 | /** 75 | * Get the distance of this cell from the disturb center (i.e. where the mouse is clicked) 76 | */ 77 | vec2 get_offset_from_disturb_center(vec2 cell_pos) { 78 | if (mouse_drag_position == vec2(-1.)) { 79 | return vec2(-1.); 80 | } 81 | 82 | return vec2(cell_pos.x - mouse_drag_position.x, cell_pos.y - mouse_drag_position.y); 83 | } 84 | 85 | void main() { 86 | // res holds the current cell, which will be augmented to its new position. 87 | // r represents x position, g represents y position, b represents angle and a is a boolean representing if the cell 88 | // is part of the simulation. 89 | vec4 res = get_simulation_value(gl_FragCoord.xy/resolution); 90 | 91 | float cell_angle = relative_angle_to_rads(res.b); 92 | float movement_angle = get_movement_angle(res.xy, cell_angle); 93 | vec2 offset = paused ? vec2(0.) : get_position_offset_from_angle(res.xy, movement_angle); 94 | 95 | vec2 disturb_offset = get_offset_from_disturb_center(res.xy); 96 | // If the user has clicked somewhere, we will have a disturb center (i.e. non -1). Check if this cell is within the radius of that click. 97 | if (disturb_offset != vec2(-1.) && length(disturb_offset) < length(vec2(disturb_radius)/resolution)) { 98 | // Divide this by sixteen so it takes a few frames for things to move out of the way 99 | float disturb_multiplier = disturb_radius/16.; 100 | offset = disturb_multiplier/resolution * vec2(sign(disturb_offset.x), sign(disturb_offset.y)); 101 | if (pull_inwards) { 102 | offset *= -1.; 103 | } 104 | } 105 | 106 | vec2 new_pos = res.xy + offset; 107 | res.r = mod(new_pos.x, 1.); 108 | res.g = mod(new_pos.y, 1.); 109 | 110 | // If a pixel was already not part of the simulation, we don't want to put it into the simulation. 111 | // This step function shouldn't be needed, but due to floating point precision issues, simply doing a *= res.a will not work. 112 | res *= step(0., res.a); 113 | 114 | gl_FragColor = res; 115 | } 116 | -------------------------------------------------------------------------------- /src/ts/index.ts: -------------------------------------------------------------------------------- 1 | import reglModule, { Framebuffer } from 'regl'; // eslint-disable-line no-unused-vars 2 | import dat from 'dat.gui'; 3 | import lodash from 'lodash'; 4 | import renderTextureShaderSource from '@shader/rendertexture.frag'; // eslint-disable-line import/no-unresolved 5 | import renderCellShaderSource from '@shader/rendercells.frag'; // eslint-disable-line import/no-unresolved 6 | import depositShaderSource from '@shader/deposit.frag'; // eslint-disable-line import/no-unresolved 7 | import renderCellVertexShaderSource from '@shader/rendercells.vert'; // eslint-disable-line import/no-unresolved 8 | import lifeShaderSource from '@shader/life.frag'; // eslint-disable-line import/no-unresolved 9 | import triangleVertexShaderSource from '@shader/triangles.vert'; // eslint-disable-line import/no-unresolved 10 | import { Flipper } from './flipper'; 11 | 12 | const CANVAS_ID = 'gl'; 13 | const CELL_PERCENTAGE = 0.30; 14 | const RENDER_TRIANGLE_VERTS = [ 15 | [-1, -1], 16 | [1, -1], 17 | [-1, 1], 18 | [-1, 1], 19 | [1, -1], 20 | [1, 1], 21 | ]; 22 | 23 | // Represents properties that can be varied in the simulation. 24 | interface SimulationProperties { 25 | stepSize: number, 26 | sensorDistance: number, 27 | sensorAngle: number, 28 | rotateAngle: number, 29 | color: [number, number, number], 30 | dragPosition: [number, number], 31 | disturbRadius: number, 32 | paused: boolean, 33 | pullInwards: boolean, 34 | } 35 | 36 | function setCanvasSize(canvas: HTMLCanvasElement): void { 37 | const html = document.querySelector('html'); 38 | /* eslint-disable no-param-reassign */ 39 | canvas.height = html.clientHeight - 4; 40 | canvas.width = html.clientWidth; 41 | /* eslint-enable no-param-reassign */ 42 | } 43 | 44 | /** 45 | * Generates random up to n random pixels of the following form. 46 | * r: x coordinate 47 | * g: y coordinate 48 | * b: z coordinate 49 | * a: 1 if the pixel is part of the simulation, 0 otherwise. 50 | * 51 | * @param numRandomItems The number of items to generate. Must be <= length. 52 | * @param length The size of the array to generate. Will be padded with zeroes. 53 | */ 54 | function makeRandomData(numRandomItems: number, length: number): number[] { 55 | if (numRandomItems > length) { 56 | throw Error('Attempted to generate more random items than array length'); 57 | } 58 | 59 | const values = Array(length).fill(0).map((_, index): [number, number, number, number] => { 60 | if (index >= numRandomItems) { 61 | return [0, 0, 0, 0]; 62 | } 63 | 64 | return [ 65 | Math.random(), 66 | Math.random(), 67 | Math.random(), 68 | 1, 69 | ]; 70 | }); 71 | 72 | return lodash.flatten(values); 73 | } 74 | 75 | /** 76 | * Sets up the GUI needed to control the simulation. 77 | * 78 | * @param controlObject The object whose properties will control the simulation. 79 | */ 80 | function setupSimulationGUI(controlObject: SimulationProperties) { 81 | const gui = new dat.GUI(); 82 | gui.add(controlObject, 'stepSize', 0, 10); 83 | gui.add(controlObject, 'sensorDistance', 0, 50); 84 | gui.add(controlObject, 'sensorAngle', 0, 90); 85 | gui.add(controlObject, 'rotateAngle', 0, 90); 86 | gui.add(controlObject, 'disturbRadius', 0, 256); 87 | gui.add(controlObject, 'paused'); 88 | gui.addColor(controlObject, 'color'); 89 | } 90 | 91 | /** 92 | * Sets up an event to update the controlObject with the current drag position of the mouse. 93 | * 94 | * @param eventTarget The element to drag on 95 | * @param controlObject The object whose properties will control the simulation. 96 | */ 97 | function setupMouseDragControl(eventTarget: HTMLElement, controlObject: SimulationProperties) { 98 | function assignPositionToController(event: MouseEvent) { 99 | if ((event.buttons & 1) !== 1) { 100 | return; 101 | } 102 | 103 | const { height, width } = eventTarget.getBoundingClientRect(); 104 | // eslint-disable-next-line no-param-reassign 105 | controlObject.dragPosition = [ 106 | event.x / width, 107 | // Our shader expects zero to be the bottom, but the event has zero be the top. 108 | 1 - event.y / height, 109 | ]; 110 | } 111 | 112 | function assignDisturbDirectionToController(event: KeyboardEvent) { 113 | // eslint-disable-next-line no-param-reassign 114 | controlObject.pullInwards = event.shiftKey; 115 | } 116 | 117 | document.addEventListener('keydown', assignDisturbDirectionToController); 118 | document.addEventListener('keyup', assignDisturbDirectionToController); 119 | 120 | eventTarget.addEventListener('mousedown', assignPositionToController); 121 | eventTarget.addEventListener('mousemove', assignPositionToController); 122 | eventTarget.addEventListener('mouseup', () => { 123 | // eslint-disable-next-line no-param-reassign 124 | controlObject.dragPosition = [-1, -1]; 125 | }); 126 | } 127 | 128 | /** 129 | * Make one vertex for each cell, with coordinates for each cell. 130 | * 131 | * @param n The number of vertices to make 132 | * @param width The width of the rendering output 133 | * @param height The height of the rendering output 134 | */ 135 | function makeCellVertices(n: number, width: number, height: number): [number, number][] { 136 | const res = []; 137 | for (let i = 0; i < width && res.length < n; i++) { 138 | for (let j = 0; j < height && res.length < n; j++) { 139 | res.push([i / width, j / height]); 140 | } 141 | } 142 | 143 | return res; 144 | } 145 | 146 | window.addEventListener('load', () => { 147 | const canvas = document.getElementById(CANVAS_ID); 148 | const simulationProperties: SimulationProperties = { 149 | stepSize: 1.1, 150 | sensorDistance: 9, 151 | sensorAngle: 22.5, 152 | rotateAngle: 45, 153 | color: [255, 255, 255], 154 | dragPosition: [-1, -1], 155 | disturbRadius: 32, 156 | paused: false, 157 | pullInwards: false, 158 | }; 159 | 160 | setCanvasSize(canvas); 161 | setupSimulationGUI(simulationProperties); 162 | setupMouseDragControl(canvas, simulationProperties); 163 | 164 | const regl = reglModule({ canvas, extensions: ['OES_texture_float', 'WEBGL_color_buffer_float'] }); 165 | 166 | /** 167 | * Makes an FBO with the settings needed to run the simulation. 168 | * @param data The data to use for the FBO 169 | */ 170 | function makeFBO(data: number[]): Framebuffer { 171 | const { width, height } = canvas; 172 | return regl.framebuffer({ 173 | width, 174 | height, 175 | colorType: 'float', 176 | color: regl.texture({ 177 | width, 178 | height, 179 | data, 180 | format: 'rgba', 181 | // unit8 is not precise enough for the angle calculations that are required. 182 | type: 'float', 183 | }), 184 | depthStencil: false, 185 | }); 186 | } 187 | 188 | const numPixels = canvas.width * canvas.height; 189 | const numCells = numPixels * CELL_PERCENTAGE; 190 | const cellData = makeRandomData(numCells, numPixels); 191 | const simulationStates = new Flipper(makeFBO(cellData), makeFBO(cellData)); 192 | const emptyData = Array(numPixels * 4).fill(0); 193 | const cellStates = new Flipper(makeFBO(emptyData), makeFBO(emptyData)); 194 | const depositStates = new Flipper(makeFBO(emptyData), makeFBO(emptyData)); 195 | 196 | /** 197 | * Flip all of the Framebuffer flippers to allow for the next iteration to read the output of the current iteration. 198 | */ 199 | function flipBuffers() { 200 | simulationStates.flip(); 201 | cellStates.flip(); 202 | depositStates.flip(); 203 | } 204 | 205 | // Runs the simulation's calculations, calculating cell positions as needed. 206 | const runSimulation = regl({ 207 | frag: lifeShaderSource, 208 | uniforms: { 209 | deposit_texture: (): Framebuffer => depositStates.peekBack(), 210 | simulation_texture: (): Framebuffer => simulationStates.peekFront(), 211 | // The type definitions for the properties state we must specify the key in the argument and the generic. 212 | step_size: regl.prop('stepSize'), 213 | sensor_distance_multiplier: regl.prop('sensorDistance'), 214 | sensor_angle_deg: regl.prop('sensorAngle'), 215 | rotate_angle_deg: regl.prop('rotateAngle'), 216 | mouse_drag_position: regl.prop('dragPosition'), 217 | disturb_radius: regl.prop('disturbRadius'), 218 | paused: regl.prop('paused'), 219 | pull_inwards: regl.prop('pullInwards'), 220 | }, 221 | framebuffer: (): Framebuffer => simulationStates.peekBack(), 222 | }); 223 | 224 | const cellVertices = makeCellVertices(numCells, canvas.width, canvas.height); 225 | // Renders the cells each as a vertex on the screen 226 | const renderCells = regl({ 227 | frag: renderCellShaderSource, 228 | vert: renderCellVertexShaderSource, 229 | framebuffer: (): Framebuffer => cellStates.peekBack(), 230 | attributes: { 231 | a_position: cellVertices, 232 | }, 233 | count: cellVertices.length, 234 | uniforms: { 235 | resolution: [canvas.width, canvas.height], 236 | simulation_texture: (): Framebuffer => simulationStates.peekFront(), 237 | }, 238 | primitive: 'points', 239 | }); 240 | 241 | // Renders the deposits from the cells, which is just the cells fed back into a texture. 242 | const renderDeposits = regl({ 243 | frag: depositShaderSource, 244 | framebuffer: (): Framebuffer => depositStates.peekBack(), 245 | uniforms: { 246 | cell_texture: (): Framebuffer => cellStates.peekFront(), 247 | feedback_texture: (): Framebuffer => depositStates.peekFront(), 248 | }, 249 | }); 250 | 251 | // Renders the entire simulation to the screen 252 | const renderSimulation = regl({ 253 | frag: renderTextureShaderSource, 254 | uniforms: { 255 | color: regl.prop('color'), 256 | luma_texture: (): Framebuffer => depositStates.peekFront(), 257 | }, 258 | }); 259 | 260 | 261 | regl.frame(() => { 262 | // Make sure we clear any cells that existed on the last frame 263 | regl.clear({ color: [0, 0, 0, 0], framebuffer: cellStates.peekBack() }); 264 | 265 | regl({ 266 | // All commands (except for renderCells) will use this vertex shader with the triangle attributes 267 | vert: triangleVertexShaderSource, 268 | attributes: { 269 | a_position: RENDER_TRIANGLE_VERTS, 270 | }, 271 | count: RENDER_TRIANGLE_VERTS.length, 272 | // All commands will use the resolution uniform 273 | uniforms: { 274 | resolution: [canvas.width, canvas.height], 275 | }, 276 | // None of the shaders need depth calculations 277 | depth: { enable: false }, 278 | })(() => { 279 | // Pass the properties to the simulation as regl properties 280 | runSimulation(simulationProperties); 281 | // Render the cells as verts to the framebuffer 282 | renderCells(); 283 | // Render and fade the old cells 284 | renderDeposits(); 285 | // Render the whole thing to the screen. 286 | renderSimulation(simulationProperties); 287 | }); 288 | 289 | flipBuffers(); 290 | }); 291 | }); 292 | -------------------------------------------------------------------------------- /LICENSE.md: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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