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For\nthe avoidance of doubt, this paragraph does not form part of the\npublic licenses.\n\nCreative Commons may be contacted at creativecommons.org.\n" }, { "path": "README-VITE.md", "content": "# React + TypeScript + Vite\n\nThis template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.\n\nCurrently, two official plugins are available:\n\n- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react/README.md) uses [Babel](https://babeljs.io/) for Fast Refresh\n- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh\n\n## Expanding the ESLint configuration\n\nIf you are developing a production application, we recommend updating the configuration to enable type aware lint rules:\n\n- Configure the top-level `parserOptions` property like this:\n\n```js\nexport default tseslint.config({\n languageOptions: {\n // other options...\n parserOptions: {\n project: ['./tsconfig.node.json', './tsconfig.app.json'],\n tsconfigRootDir: import.meta.dirname,\n },\n },\n});\n```\n\n- Replace `tseslint.configs.recommended` to `tseslint.configs.recommendedTypeChecked` or `tseslint.configs.strictTypeChecked`\n- Optionally add `...tseslint.configs.stylisticTypeChecked`\n- Install [eslint-plugin-react](https://github.com/jsx-eslint/eslint-plugin-react) and update the config:\n\n```js\n// eslint.config.js\nimport react from 'eslint-plugin-react';\n\nexport default tseslint.config({\n // Set the react version\n settings: { react: { version: '18.3' } },\n plugins: {\n // Add the react plugin\n react,\n },\n rules: {\n // other rules...\n // Enable its recommended rules\n ...react.configs.recommended.rules,\n ...react.configs['jsx-runtime'].rules,\n },\n});\n```\n" }, { "path": "README.md", "content": "# 🦠 Slime Sim WebGPU\n\nI made this slime mold simulation to learn more about WebGPU and compute shaders. \nIt's essentially a recreation of Sebastian Lague's coding adventure (albiet with\nfewer features).\n\nHere's a 45-second demo on\n[Twitter](https://x.com/SuboptimalEng/status/1873425520106582229),\n[Threads](https://www.threads.net/@suboptimaleng/post/DEK9UtZIX5n?hl=en), and\n[r/GraphicsProgramming](https://www.reddit.com/r/GraphicsProgramming/comments/1hp4kn2/webgpu_typescript_slime_mold_simulation/).\nYou can also try the playable demo on my website (linked in the about section of\nthis repo). Just know that WebGPU doesn't work on all devices so you might get an\nerror screen.\n\nIf you prefer a more in-depth video, you can checkout this [5-minute devlog on\nYouTube](https://www.youtube.com/watch?v=nBqZOz7AF34) where I showcase an extended demo\nand answer the following questions:\n\n- What is WebGPU?\n- What are compute shaders?\n- What is the graphics pipeline for this slime simulation?\n- What happens in each shader pass?\n\n## Setup Guide\n\n```\n# Setup Guide (for everyone).\ngit clone https://github.com/SuboptimalEng/slime-sim-webgpu.git\ncd slime-sim-webgpu\nnpm install\nnpm run dev\n\n# How to Deploy to GitHub Pages (mainly for me).\n# First, go to main.tsx file and enable StrictMode.\nnpm run build\nnpm run deploy\n# Disable StrictMode before running locally and pushing to GitHub.\n```\n\n## Screenshots\n\n\n\n\n\n## Resources\n\n#### WebGPU\n\n- [WebGPU Fundamentals](https://webgpufundamentals.org/)\n- [Google's Game of Life WebGPU Tutorial Series](https://codelabs.developers.google.com/your-first-webgpu-app#0)\n\n#### Slime Mold Simulation\n\n- [Jeff Jones' Physarum Research Paper](https://uwe-repository.worktribe.com/output/980579)\n- [Sebastian Lague's Slime Simulation Code](https://github.com/SebLague/Slime-Simulation)\n- [Sebastian Lague’s Slime Simulation Video](https://www.youtube.com/watch?v=X-iSQQgOd1A)\n- [Simulife Hub's Slime Mold Simulation Video](https://www.youtube.com/watch?v=qryINYcgO1s)\n- [Sage Jenson's Physarum Simulation Article](https://cargocollective.com/sagejenson/physarum)\n\n## License\n\nShield: [![CC BY-NC-SA 4.0][cc-by-nc-sa-shield]][cc-by-nc-sa]\n\nThis work is licensed under a\n[Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License][cc-by-nc-sa].\n\n[![CC BY-NC-SA 4.0][cc-by-nc-sa-image]][cc-by-nc-sa]\n\n[cc-by-nc-sa]: http://creativecommons.org/licenses/by-nc-sa/4.0/\n[cc-by-nc-sa-image]: https://licensebuttons.net/l/by-nc-sa/4.0/88x31.png\n[cc-by-nc-sa-shield]: https://img.shields.io/badge/License-CC%20BY--NC--SA%204.0-lightgrey.svg\n" }, { "path": "eslint.config.js", "content": "import js from '@eslint/js';\nimport globals from 'globals';\nimport reactHooks from 'eslint-plugin-react-hooks';\nimport reactRefresh from 'eslint-plugin-react-refresh';\nimport tseslint from 'typescript-eslint';\n\nexport default tseslint.config(\n { ignores: ['dist'] },\n {\n extends: [js.configs.recommended, ...tseslint.configs.recommended],\n files: ['**/*.{ts,tsx}'],\n languageOptions: {\n ecmaVersion: 2020,\n globals: globals.browser,\n },\n plugins: {\n 'react-hooks': reactHooks,\n 'react-refresh': reactRefresh,\n },\n rules: {\n ...reactHooks.configs.recommended.rules,\n 'react-refresh/only-export-components': [\n 'warn',\n { allowConstantExport: true },\n ],\n },\n },\n);\n" }, { "path": "index.html", "content": "\n\n \n \n \n \n Slime Sim WebGPU\n \n \n
\n \n \n \n \n\n" }, { "path": "package.json", "content": "{\n \"name\": \"slime-mold-webgpu-ts\",\n \"private\": true,\n \"version\": \"0.0.0\",\n \"type\": \"module\",\n \"scripts\": {\n \"dev\": \"vite\",\n \"build\": \"tsc -b && vite build\",\n \"deploy\": \"gh-pages -d dist\",\n \"lint\": \"eslint .\",\n \"preview\": \"vite preview\"\n },\n \"dependencies\": {\n \"react\": \"^18.3.1\",\n \"react-dom\": \"^18.3.1\",\n \"tweakpane\": \"^4.0.5\"\n },\n \"devDependencies\": {\n \"@eslint/js\": \"^9.13.0\",\n \"@tweakpane/core\": \"^2.0.5\",\n \"@types/react\": \"^18.3.12\",\n \"@types/react-dom\": \"^18.3.1\",\n \"@vitejs/plugin-react\": \"^4.3.3\",\n \"@webgpu/types\": \"^0.1.51\",\n \"autoprefixer\": \"^10.4.20\",\n \"eslint\": \"^9.13.0\",\n \"eslint-plugin-react-hooks\": \"^5.0.0\",\n \"eslint-plugin-react-refresh\": \"^0.4.14\",\n \"gh-pages\": \"^6.2.0\",\n \"globals\": \"^15.11.0\",\n \"postcss\": \"^8.4.49\",\n \"tailwindcss\": \"^3.4.15\",\n \"typescript\": \"~5.6.2\",\n \"typescript-eslint\": \"^8.11.0\",\n \"vite\": \"^5.4.10\"\n }\n}\n" }, { "path": "postcss.config.js", "content": "export default {\n plugins: {\n tailwindcss: {},\n autoprefixer: {},\n },\n}\n" }, { "path": "src/App.tsx", "content": "import { useEffect, useState } from 'react';\nimport { main, cleanUp } from './slime-mold/main';\n\nfunction App() {\n const [errorMessage, setErrorMessage] = useState('');\n\n useEffect(() => {\n const runMainAsync = async () => {\n try {\n await main();\n } catch (e: any) {\n setErrorMessage(String(e));\n cleanUp();\n }\n };\n\n runMainAsync();\n\n return () => {\n // We need to cancel request animation frame in the old main fn\n // when refreshing the page to avoid getting WebGPU errors.\n cleanUp();\n };\n }, []);\n\n return (\n
\n {errorMessage.length > 0 && (\n
{errorMessage}
\n )}\n
\n \n
\n
\n );\n}\n\nexport default App;\n" }, { "path": "src/index.css", "content": "@tailwind base;\n@tailwind components;\n@tailwind utilities;\n" }, { "path": "src/main.tsx", "content": "import { StrictMode } from 'react';\nimport { createRoot } from 'react-dom/client';\nimport './index.css';\nimport App from './App.tsx';\n\ncreateRoot(document.getElementById('root')!).render(\n // todo: use strict mode\n // \n // \n // ,\n ,\n);\n" }, { "path": "src/slime-mold/create-pipeline-fns.ts", "content": "import commonUniformsWGSL from './shaders/common-uniforms.wgsl?raw';\nimport c1UpdateAgentsWGSL from './shaders/compute-01-update-agents.wgsl?raw';\nimport c2FadeAgentsTrailWGSL from './shaders/compute-02-fade-agents-trail.wgsl?raw';\nimport c3BlurAgentsTrailWGSL from './shaders/compute-03-blur-agents-trail.wgsl?raw';\nimport r1DrawAgentsWGSL from './shaders/render-01-draw-agents.wgsl?raw';\n\nconst createUpdateAgentsComputePipeline = (\n device: GPUDevice,\n slimeSimUniformsBufferGPU: GPUBuffer,\n agentsBufferGPU: GPUBuffer,\n gpuTextureForReadView: GPUTextureView,\n gpuTextureForStorageView: GPUTextureView,\n) => {\n const updateAgentsWGSL = [commonUniformsWGSL, c1UpdateAgentsWGSL].join('');\n const updateAgentsShaderModule = device.createShaderModule({\n label: 'update agents: create shader module',\n code: updateAgentsWGSL,\n });\n const updateAgentsComputeBindGroupLayout = device.createBindGroupLayout({\n label: 'update agents: create compute bind group layout',\n entries: [\n {\n binding: 0,\n visibility: GPUShaderStage.COMPUTE,\n buffer: {\n type: 'uniform',\n },\n },\n {\n binding: 1,\n visibility: GPUShaderStage.COMPUTE,\n buffer: {\n type: 'storage',\n },\n },\n {\n binding: 2,\n visibility: GPUShaderStage.COMPUTE,\n texture: {\n viewDimension: '2d',\n },\n },\n {\n binding: 3,\n visibility: GPUShaderStage.COMPUTE,\n storageTexture: {\n format: 'rgba8unorm',\n access: 'write-only',\n viewDimension: '2d',\n },\n },\n ],\n });\n const updateAgentsComputePipelineLayout = device.createPipelineLayout({\n label: 'update agents: create compute pipeline layout',\n bindGroupLayouts: [updateAgentsComputeBindGroupLayout],\n });\n const updateAgentsComputePipeline = device.createComputePipeline({\n label: 'update agents: create compute pipeline',\n layout: updateAgentsComputePipelineLayout,\n // todo: this seems to work, what are pros/cons of using auto?\n // layout: 'auto',\n compute: {\n entryPoint: 'updateAgents',\n module: updateAgentsShaderModule,\n },\n });\n const updateAgentsComputeBindGroup = device.createBindGroup({\n label: 'update agents: create compute bind group',\n layout: updateAgentsComputeBindGroupLayout,\n // layout: updateAgentsComputePipeline.getBindGroupLayout(0),\n entries: [\n {\n binding: 0,\n resource: {\n buffer: slimeSimUniformsBufferGPU,\n },\n },\n {\n binding: 1,\n resource: {\n buffer: agentsBufferGPU,\n },\n },\n {\n binding: 2,\n resource: gpuTextureForReadView,\n },\n {\n binding: 3,\n resource: gpuTextureForStorageView,\n },\n ],\n });\n return { updateAgentsComputePipeline, updateAgentsComputeBindGroup };\n};\n\nconst createFadeAgentsTrailComputePipeline = (\n device: GPUDevice,\n slimeSimUniformsBufferGPU: GPUBuffer,\n gpuTextureForReadView: GPUTextureView,\n gpuTextureForStorageView: GPUTextureView,\n) => {\n const fadeAgentsTrailWGSL = [commonUniformsWGSL, c2FadeAgentsTrailWGSL].join(\n '',\n );\n const fadeAgentsTrailShaderModule = device.createShaderModule({\n label: 'fade agents trail: create shader module',\n code: fadeAgentsTrailWGSL,\n });\n const fadeAgentsTrailComputeBindGroupLayout = device.createBindGroupLayout({\n label: 'fade agents trail: create bind group layout',\n entries: [\n {\n binding: 0,\n visibility: GPUShaderStage.COMPUTE,\n buffer: {\n type: 'uniform',\n },\n },\n {\n binding: 1,\n visibility: GPUShaderStage.COMPUTE,\n texture: {\n viewDimension: '2d',\n },\n },\n {\n binding: 2,\n visibility: GPUShaderStage.COMPUTE,\n storageTexture: {\n format: 'rgba8unorm',\n access: 'write-only',\n viewDimension: '2d',\n },\n },\n ],\n });\n const fadeAgentsTrailComputePipelineLayout = device.createPipelineLayout({\n label: 'fade agents trail: create compute pipeline layout',\n bindGroupLayouts: [fadeAgentsTrailComputeBindGroupLayout],\n });\n const fadeAgentsTrailComputePipeline = device.createComputePipeline({\n label: 'fade agents trail: create compute pipeline',\n layout: fadeAgentsTrailComputePipelineLayout,\n compute: {\n entryPoint: 'fadeAgentsTrail',\n module: fadeAgentsTrailShaderModule,\n },\n });\n const fadeAgentsTrailBindGroup = device.createBindGroup({\n label: 'fade agents trail: create bind group',\n // layout: fadeAgentsTrailComputePipeline.getBindGroupLayout(0),\n layout: fadeAgentsTrailComputeBindGroupLayout,\n entries: [\n {\n binding: 0,\n resource: {\n buffer: slimeSimUniformsBufferGPU,\n },\n },\n {\n binding: 1,\n resource: gpuTextureForReadView,\n },\n {\n binding: 2,\n resource: gpuTextureForStorageView,\n },\n ],\n });\n\n return { fadeAgentsTrailComputePipeline, fadeAgentsTrailBindGroup };\n};\n\nconst createBlurAgentsTrailComputePipeline = (\n device: GPUDevice,\n slimeSimUniformsBufferGPU: GPUBuffer,\n colorizationUniformsBufferGPU: GPUBuffer,\n gpuTextureForReadView: GPUTextureView,\n gpuTextureForStorageView: GPUTextureView,\n) => {\n // prettier-ignore\n const blurAgentsTrailWGSL = [commonUniformsWGSL, c3BlurAgentsTrailWGSL].join('');\n const blurAgentsTrailShaderModule = device.createShaderModule({\n label: 'blur agents trail: create shader module',\n code: blurAgentsTrailWGSL,\n });\n const blurAgentsTrailComputeBindGroupLayout = device.createBindGroupLayout({\n label: 'blur agents trail: create bindgroup layout',\n entries: [\n {\n binding: 0,\n visibility: GPUShaderStage.COMPUTE,\n buffer: {\n type: 'uniform',\n },\n },\n {\n binding: 1,\n visibility: GPUShaderStage.COMPUTE,\n buffer: {\n type: 'uniform',\n },\n },\n {\n binding: 2,\n visibility: GPUShaderStage.COMPUTE,\n texture: {\n viewDimension: '2d',\n },\n },\n {\n binding: 3,\n visibility: GPUShaderStage.COMPUTE,\n storageTexture: {\n format: 'rgba8unorm',\n access: 'write-only',\n viewDimension: '2d',\n },\n },\n ],\n });\n const blurAgentsTrailPipelineLayout = device.createPipelineLayout({\n label: 'blur agents trail: create pipeline layout',\n bindGroupLayouts: [blurAgentsTrailComputeBindGroupLayout],\n });\n const blurAgentsTrailPipeline = device.createComputePipeline({\n label: 'blur agents trail: create compute pipeline',\n layout: blurAgentsTrailPipelineLayout,\n compute: {\n entryPoint: 'blurAgentsTrail',\n module: blurAgentsTrailShaderModule,\n },\n });\n const blurAgentsTrailBindGroup = device.createBindGroup({\n label: 'blur agents trail: create bind group',\n layout: blurAgentsTrailComputeBindGroupLayout,\n entries: [\n {\n binding: 0,\n resource: {\n buffer: slimeSimUniformsBufferGPU,\n },\n },\n {\n binding: 1,\n resource: {\n buffer: colorizationUniformsBufferGPU,\n },\n },\n {\n binding: 2,\n resource: gpuTextureForReadView,\n },\n {\n binding: 3,\n resource: gpuTextureForStorageView,\n },\n ],\n });\n return { blurAgentsTrailPipeline, blurAgentsTrailBindGroup };\n};\n\nconst createDrawAgentsRenderPipeline = (\n device: GPUDevice,\n canvasFormat: GPUTextureFormat,\n slimeSimUniformsBufferGPU: GPUBuffer,\n colorizationUniformsBufferGPU: GPUBuffer,\n gpuTextureForReadView: GPUTextureView,\n) => {\n const drawAgentsWGSL = [commonUniformsWGSL, r1DrawAgentsWGSL].join('');\n const drawAgentsShaderModule = device.createShaderModule({\n label: 'draw agents: create shader module',\n code: drawAgentsWGSL,\n });\n const drawAgentsBindGroupLayout = device.createBindGroupLayout({\n label: 'draw agents: create bind group layout',\n entries: [\n {\n binding: 0,\n visibility: GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'uniform',\n },\n },\n {\n binding: 1,\n visibility: GPUShaderStage.FRAGMENT,\n buffer: {\n type: 'uniform',\n },\n },\n {\n binding: 2,\n visibility: GPUShaderStage.FRAGMENT,\n texture: {\n sampleType: 'float',\n },\n },\n ],\n });\n const drawAgentsRenderPipeline = device.createRenderPipeline({\n label: 'draw agents: create render pipeline',\n layout: device.createPipelineLayout({\n bindGroupLayouts: [drawAgentsBindGroupLayout],\n }),\n vertex: {\n entryPoint: 'vertexShader',\n module: drawAgentsShaderModule,\n },\n fragment: {\n entryPoint: 'fragmentShader',\n module: drawAgentsShaderModule,\n targets: [\n {\n format: canvasFormat,\n },\n ],\n },\n primitive: {\n topology: 'triangle-list',\n },\n });\n const drawAgentsBindGroup = device.createBindGroup({\n label: 'draw agents: create bind group',\n layout: drawAgentsBindGroupLayout,\n entries: [\n {\n binding: 0,\n resource: {\n buffer: slimeSimUniformsBufferGPU,\n },\n },\n {\n binding: 1,\n resource: {\n buffer: colorizationUniformsBufferGPU,\n },\n },\n {\n binding: 2,\n resource: gpuTextureForReadView,\n },\n ],\n });\n return { drawAgentsRenderPipeline, drawAgentsBindGroup };\n};\n\nexport {\n createUpdateAgentsComputePipeline,\n createFadeAgentsTrailComputePipeline,\n createBlurAgentsTrailComputePipeline,\n createDrawAgentsRenderPipeline,\n};\n" }, { "path": "src/slime-mold/initialize-fns.ts", "content": "import { Pane } from 'tweakpane';\nimport { UNIFORMS_COLORIZATION, UNIFORMS_SLIME_SIM } from './uniforms';\nimport {\n resetAgentsBuffer,\n resetColorizationUniformsBuffer,\n resetGPUTextures,\n resetSlimeSimUniformsBuffer,\n} from './initialize-helpers';\n\nconst initializeWebGPU = async (canvasWidth: number, canvasHeight: number) => {\n const canvas = document.querySelector('canvas');\n if (!canvas) {\n throw new Error('No canvas detected in the browser.');\n }\n\n if (!navigator.gpu) {\n throw new Error('WebGPU is not supported in this browser.');\n }\n\n const adapter = await navigator.gpu.requestAdapter();\n if (!adapter) {\n throw new Error('No appropriate GPUAdapter found.');\n }\n\n // https://eliemichel.github.io/LearnWebGPU/getting-started/adapter-and-device/the-device.html\n // device is used to create all other gpu objects\n // once device is created, the adapter should in general no longer be used\n const device = await adapter.requestDevice();\n\n device.addEventListener('uncapturederror', (event) => {\n console.log(\n `%c ${(event as GPUUncapturedErrorEvent).error.message}`,\n 'color: #FF0000; font-weight: bold; font-size: 12px',\n );\n });\n\n canvas.width = canvasWidth;\n canvas.height = canvasHeight;\n const canvasFormat = navigator.gpu.getPreferredCanvasFormat();\n const context = canvas.getContext('webgpu');\n if (!context) {\n throw new Error('Cannot recieve WebGPU context from canvas.');\n }\n\n context.configure({\n device: device,\n format: canvasFormat,\n });\n\n return { device, canvas, canvasFormat, context };\n};\n\nconst initializeSlimeSimUniforms = (\n device: GPUDevice,\n canvas: HTMLCanvasElement,\n pane: Pane,\n): GPUBuffer => {\n // =============================================================\n // Set up tweakpane settings.\n // =============================================================\n const generalFolder = pane.addFolder({ title: 'General' });\n generalFolder.addBinding(UNIFORMS_SLIME_SIM.radius, 'value', {\n ...UNIFORMS_SLIME_SIM.radius,\n });\n generalFolder.addBinding(UNIFORMS_SLIME_SIM.stepSize, 'value', {\n ...UNIFORMS_SLIME_SIM.stepSize,\n });\n generalFolder.addBinding(UNIFORMS_SLIME_SIM.decayT, 'value', {\n ...UNIFORMS_SLIME_SIM.decayT,\n });\n\n const agentFolder = pane.addFolder({ title: 'Agent' });\n agentFolder.addBinding(UNIFORMS_SLIME_SIM.sensorOffset, 'value', {\n ...UNIFORMS_SLIME_SIM.sensorOffset,\n });\n agentFolder.addBinding(UNIFORMS_SLIME_SIM.sensorAngle, 'value', {\n ...UNIFORMS_SLIME_SIM.sensorAngle,\n });\n agentFolder.addBinding(UNIFORMS_SLIME_SIM.rotationAngle, 'value', {\n ...UNIFORMS_SLIME_SIM.rotationAngle,\n });\n\n const randomizeAgentSettingsButton = agentFolder.addButton({\n title: 'Randomize Agent Settings',\n });\n\n // =============================================================\n // Create gpu buffer(s).\n //\n // Array of size 8 is too small.\n // =============================================================\n const uniformsCPU = new Float32Array(10);\n const uniformsBufferGPU = device.createBuffer({\n label: 'create uniforms buffer for gpu',\n size: uniformsCPU.byteLength,\n usage:\n GPUBufferUsage.COPY_DST |\n GPUBufferUsage.COPY_SRC |\n GPUBufferUsage.UNIFORM,\n });\n resetSlimeSimUniformsBuffer(device, canvas, uniformsCPU, uniformsBufferGPU);\n\n // =============================================================\n // Add tweakpane handlers.\n // =============================================================\n pane.on('change', () => {\n resetSlimeSimUniformsBuffer(device, canvas, uniformsCPU, uniformsBufferGPU);\n console.log('pane changed!');\n });\n randomizeAgentSettingsButton.on('click', () => {\n console.log('randomize agents clicked!');\n const getRandomValue = (min: number, max: number, step: number) => {\n const range = (max - min) / step;\n const randomStep = Math.floor(Math.random() * (range + 1));\n return min + randomStep * step;\n };\n\n const sensorOffset = UNIFORMS_SLIME_SIM.sensorOffset;\n const sensorAngle = UNIFORMS_SLIME_SIM.sensorAngle;\n const rotationAngle = UNIFORMS_SLIME_SIM.rotationAngle;\n\n UNIFORMS_SLIME_SIM.sensorOffset.value = getRandomValue(\n sensorOffset.min,\n sensorOffset.max,\n sensorOffset.step,\n );\n UNIFORMS_SLIME_SIM.sensorAngle.value = getRandomValue(\n sensorAngle.min,\n sensorAngle.max,\n sensorAngle.step,\n );\n UNIFORMS_SLIME_SIM.rotationAngle.value = getRandomValue(\n rotationAngle.min,\n rotationAngle.max,\n rotationAngle.step,\n );\n\n pane.refresh();\n });\n\n return uniformsBufferGPU;\n};\n\nconst initializeColorizationUniforms = (device: GPUDevice, pane: Pane) => {\n // =============================================================\n // Set up tweakpane settings.\n // =============================================================\n const colorizationFolder = pane.addFolder({ title: 'Colorization' });\n colorizationFolder.addBinding(UNIFORMS_COLORIZATION.blurTrail, 'value', {\n ...UNIFORMS_COLORIZATION.blurTrail,\n });\n colorizationFolder.addBinding(UNIFORMS_COLORIZATION.enableLighting, 'value', {\n ...UNIFORMS_COLORIZATION.enableLighting,\n });\n colorizationFolder.addBinding(UNIFORMS_COLORIZATION.slimeColor, 'value', {\n ...UNIFORMS_COLORIZATION.slimeColor,\n });\n\n // =============================================================\n // Create gpu buffer(s).\n // =============================================================\n const colorizationUniformsArrayCPU = new Float32Array(12);\n const colorizationUniformsBufferGPU = device.createBuffer({\n label: 'colorization uniforms buffer',\n size: colorizationUniformsArrayCPU.byteLength,\n usage:\n GPUBufferUsage.COPY_DST |\n GPUBufferUsage.COPY_SRC |\n GPUBufferUsage.UNIFORM,\n });\n resetColorizationUniformsBuffer(\n device,\n colorizationUniformsArrayCPU,\n colorizationUniformsBufferGPU,\n );\n\n // =============================================================\n // Add tweakpane handlers.\n // =============================================================\n colorizationFolder.on('change', () => {\n resetColorizationUniformsBuffer(\n device,\n colorizationUniformsArrayCPU,\n colorizationUniformsBufferGPU,\n );\n });\n\n return colorizationUniformsBufferGPU;\n};\n\nconst initializeGPUTextures = (\n device: GPUDevice,\n canvas: HTMLCanvasElement,\n) => {\n // =============================================================\n // Create gpu buffer(s).\n // =============================================================\n const gpuTextureForStorage = device.createTexture({\n label: 'create texture A for storage on gpu',\n format: 'rgba8unorm',\n size: {\n width: canvas.width,\n height: canvas.height,\n },\n usage:\n GPUTextureUsage.COPY_DST |\n GPUTextureUsage.COPY_SRC |\n GPUTextureUsage.STORAGE_BINDING |\n GPUTextureUsage.TEXTURE_BINDING,\n });\n const gpuTextureForRead = device.createTexture({\n label: 'create texture B for read on gpu',\n format: 'rgba8unorm',\n size: {\n width: canvas.width,\n height: canvas.height,\n },\n usage: GPUTextureUsage.COPY_DST | GPUTextureUsage.TEXTURE_BINDING,\n });\n const gpuTextureForStorageView = gpuTextureForStorage.createView();\n const gpuTextureForReadView = gpuTextureForRead.createView();\n return {\n gpuTextureForStorage,\n gpuTextureForStorageView,\n gpuTextureForRead,\n gpuTextureForReadView,\n };\n};\n\nconst initializeAgents = (\n device: GPUDevice,\n canvas: HTMLCanvasElement,\n pane: Pane,\n gpuTextureForStorage: GPUTexture,\n gpuTextureForRead: GPUTexture,\n) => {\n // =============================================================\n // Set up tweakpane settings.\n // =============================================================\n const simulationFolder = pane.addFolder({ title: 'Simulation' });\n simulationFolder.addBinding(UNIFORMS_SLIME_SIM.numOfAgents, 'value', {\n ...UNIFORMS_SLIME_SIM.numOfAgents,\n });\n simulationFolder.addBinding(UNIFORMS_SLIME_SIM.startRadius, 'value', {\n ...UNIFORMS_SLIME_SIM.startRadius,\n });\n const downloadImageButton = simulationFolder.addButton({\n title: 'Download Image',\n });\n\n // =============================================================\n // Create gpu buffer(s).\n // =============================================================\n // todo: Currently, bind groups don't change variables so we initialize agentsBufferGPU\n // to be max size so that numOfAgents slider works as expected. More correct approach\n // could be to re-create bindgroups with agentsBufferGPU whenever it changes.\n // this will not incur performance hit because compute pass runs with SLIME_MOLD_UNIFORMS.numOfAgents\n // even if this gpu array is large, we won't use it for most calculations when numOfAgents is small\n const maxAgentsArraySize = UNIFORMS_SLIME_SIM.numOfAgents.max * 4;\n const fakeArrayCPU = new Float32Array(maxAgentsArraySize);\n const agentsBufferGPU = device.createBuffer({\n label: 'create agents buffer',\n size: fakeArrayCPU.byteLength,\n usage:\n GPUBufferUsage.STORAGE |\n GPUBufferUsage.COPY_SRC |\n GPUBufferUsage.COPY_DST,\n });\n resetAgentsBuffer(device, canvas, agentsBufferGPU);\n resetGPUTextures(device, canvas, gpuTextureForStorage, gpuTextureForRead);\n\n // =============================================================\n // Add tweakpane handlers.\n // =============================================================\n simulationFolder.on('change', () => {\n resetAgentsBuffer(device, canvas, agentsBufferGPU);\n resetGPUTextures(device, canvas, gpuTextureForStorage, gpuTextureForRead);\n });\n\n downloadImageButton.on('click', () => {\n const canvasImage = canvas.toDataURL('image/png');\n\n // this can be used to download any image from webpage to local disk\n const xhr = new XMLHttpRequest();\n xhr.responseType = 'blob';\n xhr.onload = () => {\n const a = document.createElement('a');\n a.href = window.URL.createObjectURL(xhr.response);\n a.download = 'slime-mold.png';\n a.style.display = 'none';\n document.body.appendChild(a);\n a.click();\n a.remove();\n };\n xhr.open('GET', canvasImage); // This is to download the canvas Image\n xhr.send();\n });\n\n return agentsBufferGPU;\n};\n\nexport {\n initializeWebGPU,\n initializeGPUTextures,\n initializeAgents,\n initializeColorizationUniforms,\n initializeSlimeSimUniforms,\n};\n" }, { "path": "src/slime-mold/initialize-helpers.ts", "content": "import { UNIFORMS_COLORIZATION, UNIFORMS_SLIME_SIM } from './uniforms';\n\nconst resetAgentsBuffer = (\n device: GPUDevice,\n canvas: HTMLCanvasElement,\n agentsBufferGPU: GPUBuffer,\n) => {\n const numOfAgents = UNIFORMS_SLIME_SIM.numOfAgents.value;\n const agentsArraySize = numOfAgents * 4;\n const agentsArrayCPU = new Float32Array(agentsArraySize);\n\n // initialize agents data\n for (let i = 0; i < numOfAgents; i++) {\n // agent position\n let x = canvas.width / 2;\n let y = canvas.height / 2;\n let r = Math.random() * 10;\n agentsArrayCPU[i * 4 + 0] =\n x + Math.cos(r) * UNIFORMS_SLIME_SIM.startRadius.value;\n agentsArrayCPU[i * 4 + 1] =\n y + Math.sin(r) * UNIFORMS_SLIME_SIM.startRadius.value;\n\n // agent direction\n agentsArrayCPU[i * 4 + 2] = Math.random() * 2 - 1;\n agentsArrayCPU[i * 4 + 3] = Math.random() * 2 - 1;\n }\n\n // write to gpu buffer\n device.queue.writeBuffer(agentsBufferGPU, 0, agentsArrayCPU);\n\n return agentsBufferGPU;\n};\n\nconst resetSlimeSimUniformsBuffer = (\n device: GPUDevice,\n canvas: HTMLCanvasElement,\n uniformsCPU: Float32Array,\n uniformsBufferGPU: GPUBuffer,\n) => {\n // canvas\n uniformsCPU[0] = canvas.width;\n uniformsCPU[1] = canvas.height;\n\n // general\n uniformsCPU[2] = UNIFORMS_SLIME_SIM.radius.value;\n uniformsCPU[3] = UNIFORMS_SLIME_SIM.stepSize.value;\n uniformsCPU[4] = UNIFORMS_SLIME_SIM.decayT.value;\n\n // sensor\n uniformsCPU[5] = UNIFORMS_SLIME_SIM.sensorOffset.value;\n uniformsCPU[6] = UNIFORMS_SLIME_SIM.sensorAngle.value;\n uniformsCPU[7] = UNIFORMS_SLIME_SIM.rotationAngle.value;\n\n device.queue.writeBuffer(uniformsBufferGPU, 0, uniformsCPU);\n return uniformsBufferGPU;\n};\n\nconst resetColorizationUniformsBuffer = (\n device: GPUDevice,\n colorizationUniformsCPU: Float32Array,\n colorizationUniformsBufferGPU: GPUBuffer,\n) => {\n colorizationUniformsCPU[0] = UNIFORMS_COLORIZATION.blurTrail.value ? 1 : 0;\n colorizationUniformsCPU[1] = UNIFORMS_COLORIZATION.enableLighting.value\n ? 1\n : 0;\n\n const slimeColor = UNIFORMS_COLORIZATION.slimeColor.value;\n // todo: dive a little deeper into struct memory packing\n // todo: for some reason, this needs to be 4th value, can't be the 1st one?\n colorizationUniformsCPU[4] = slimeColor.r / 255;\n colorizationUniformsCPU[5] = slimeColor.g / 255;\n colorizationUniformsCPU[6] = slimeColor.b / 255;\n\n device.queue.writeBuffer(\n colorizationUniformsBufferGPU,\n 0,\n colorizationUniformsCPU,\n );\n};\n\nconst resetGPUTextures = (\n device: GPUDevice,\n canvas: HTMLCanvasElement,\n gpuTextureForStorage: GPUTexture,\n gpuTextureForRead: GPUTexture,\n) => {\n const size = Math.floor(canvas.width * canvas.height) * 4;\n const textureDataCPU = new Int8Array(size);\n for (let i = 0; i < canvas.width * canvas.height; i++) {\n textureDataCPU[i * 4 + 0] = 0;\n textureDataCPU[i * 4 + 1] = 0;\n textureDataCPU[i * 4 + 2] = 0;\n textureDataCPU[i * 4 + 3] = 255;\n }\n\n device.queue.writeTexture(\n {\n texture: gpuTextureForStorage,\n },\n textureDataCPU,\n {\n bytesPerRow: canvas.width * 4,\n },\n {\n width: canvas.width,\n height: canvas.height,\n },\n );\n\n device.queue.writeTexture(\n {\n texture: gpuTextureForRead,\n },\n textureDataCPU,\n {\n bytesPerRow: canvas.width * 4,\n },\n {\n width: canvas.width,\n height: canvas.height,\n },\n );\n};\n\nexport {\n resetAgentsBuffer,\n resetColorizationUniformsBuffer,\n resetGPUTextures,\n resetSlimeSimUniformsBuffer,\n};\n" }, { "path": "src/slime-mold/main.ts", "content": "import { Pane } from 'tweakpane';\nimport { UNIFORMS_SLIME_SIM } from './uniforms';\nimport {\n initializeWebGPU,\n initializeGPUTextures,\n initializeAgents,\n initializeColorizationUniforms,\n initializeSlimeSimUniforms,\n} from './initialize-fns';\nimport {\n createUpdateAgentsComputePipeline,\n createFadeAgentsTrailComputePipeline,\n createBlurAgentsTrailComputePipeline,\n createDrawAgentsRenderPipeline,\n} from './create-pipeline-fns';\n\n// =============================================================\n// These global variables are requied for the cleanUp fn.\n// =============================================================\nlet initializedPane: Pane = new Pane();\nlet rafId: number = 0;\n\nconst main = async () => {\n let canvasWidth = 800;\n let canvasHeight = 600;\n // canvasWidth = 800;\n // canvasHeight = 800;\n // canvasWidth = 1600;\n // canvasHeight = 900;\n // canvasWidth *= 0.75;\n // canvasHeight *= 0.75;\n\n // =============================================================\n // canvas -> ref to canvas, mainly used width/height info\n // device -> everything related to webgpu requires the device\n // canvasFormat -> needed for render pipeline fragment shader settings\n // context -> needed to create a view in the render pass\n // =============================================================\n let device: GPUDevice | null = null;\n let canvas: HTMLCanvasElement | null = null;\n let canvasFormat: GPUTextureFormat | null = null;\n let context: GPUCanvasContext | null = null;\n try {\n const result = await initializeWebGPU(canvasWidth, canvasHeight);\n device = result.device;\n canvas = result.canvas;\n canvasFormat = result.canvasFormat;\n context = result.context;\n } catch (e: any) {\n throw e;\n }\n\n // =============================================================\n // Initialize gpu storage texture that can be written to in compute shaders.\n //\n // Storage textures in WebGPU do not support read_write yet. This means\n // that we can write to storage texture in a compute pass, but we cannot\n // read from it in another compute pass. To get around this, we can create\n // a separate texture that copies the data from the storage texture after\n // every compute pass is complete. We can use this second texture to read\n // from in other compute passes.\n // =============================================================\n const {\n gpuTextureForStorage,\n gpuTextureForStorageView,\n gpuTextureForRead,\n gpuTextureForReadView,\n } = initializeGPUTextures(device, canvas);\n\n // =============================================================\n // Initialize the agents buffer.\n // =============================================================\n const agentsBufferGPU = initializeAgents(\n device,\n canvas,\n initializedPane,\n gpuTextureForStorage,\n gpuTextureForRead,\n );\n\n // =============================================================\n // Initialize slime sim uniforms and tweakpane.\n // =============================================================\n const slimeSimUniformsBufferGPU = initializeSlimeSimUniforms(\n device,\n canvas,\n initializedPane,\n );\n\n // =============================================================\n // Initialize colorization uniforms and tweakpane.\n // =============================================================\n const colorizationUniformsBufferGPU = initializeColorizationUniforms(\n device,\n initializedPane,\n );\n\n // =============================================================\n // 1. Create updateAgents compute pipeline.\n //\n // This pass updates the position + direction of each agent.\n // It also draws the result onto a storage texture.\n // =============================================================\n const { updateAgentsComputePipeline, updateAgentsComputeBindGroup } =\n createUpdateAgentsComputePipeline(\n device,\n slimeSimUniformsBufferGPU,\n agentsBufferGPU,\n gpuTextureForReadView,\n gpuTextureForStorageView,\n );\n\n // =============================================================\n // 2. Create fadeAgentsTrail compute pipeline.\n // =============================================================\n const { fadeAgentsTrailComputePipeline, fadeAgentsTrailBindGroup } =\n createFadeAgentsTrailComputePipeline(\n device,\n slimeSimUniformsBufferGPU,\n gpuTextureForReadView,\n gpuTextureForStorageView,\n );\n\n // =============================================================\n // 3. Create blurAgentsTrail compute pipeline.\n // =============================================================\n const { blurAgentsTrailPipeline, blurAgentsTrailBindGroup } =\n createBlurAgentsTrailComputePipeline(\n device,\n slimeSimUniformsBufferGPU,\n colorizationUniformsBufferGPU,\n gpuTextureForReadView,\n gpuTextureForStorageView,\n );\n\n // =============================================================\n // 4. Create drawAgents render pass.\n // =============================================================\n const { drawAgentsRenderPipeline, drawAgentsBindGroup } =\n createDrawAgentsRenderPipeline(\n device,\n canvasFormat,\n slimeSimUniformsBufferGPU,\n colorizationUniformsBufferGPU,\n // todo: Which one is it? Storage or read? Both seem to work.\n // I'll stick with read view since that's what it's defined to\n // be in pipeline and WGSL shader.\n gpuTextureForReadView,\n // gpuTextureForStorageView,\n );\n\n // =============================================================\n // Define the render loop.\n // =============================================================\n const render = () => {\n const encoder = device.createCommandEncoder();\n\n // =============================================================\n // 1. Run the updateAgents compute pass.\n // =============================================================\n const updateAgentsComputePass = encoder.beginComputePass({\n label: 'update agents: begin compute pass',\n });\n updateAgentsComputePass.setPipeline(updateAgentsComputePipeline);\n updateAgentsComputePass.setBindGroup(0, updateAgentsComputeBindGroup);\n updateAgentsComputePass.dispatchWorkgroups(\n UNIFORMS_SLIME_SIM.numOfAgents.value,\n );\n updateAgentsComputePass.end();\n\n // =============================================================\n // GPU storage textures do no support read + write (yet), so we need to\n // copy the storage texture data into a read texture so that it can be\n // accessed in the next pass (from the read texture).\n //\n // Copy agent positions from storage -> read texture.\n // =============================================================\n encoder.copyTextureToTexture(\n { texture: gpuTextureForStorage }, // Source\n { texture: gpuTextureForRead }, // Destination\n [canvas.width, canvas.height, 1], // Size (width, height, depthOrArrayLayers)\n );\n\n // =============================================================\n // 2. Run the fadeAgentsTrail compute pass.\n // =============================================================\n const fadeAgentsTrailComputePass = encoder.beginComputePass({\n label: 'fade agents trail: begin compute pass',\n });\n fadeAgentsTrailComputePass.setPipeline(fadeAgentsTrailComputePipeline);\n fadeAgentsTrailComputePass.setBindGroup(0, fadeAgentsTrailBindGroup);\n fadeAgentsTrailComputePass.dispatchWorkgroups(canvas.width, canvas.height);\n fadeAgentsTrailComputePass.end();\n\n // =============================================================\n // Copy fading trail from storage -> read texture.\n // =============================================================\n encoder.copyTextureToTexture(\n { texture: gpuTextureForStorage }, // Source\n { texture: gpuTextureForRead }, // Destination\n [canvas.width, canvas.height, 1], // Size (width, height, depthOrArrayLayers)\n );\n\n // =============================================================\n // 3. Run the blurAgentsTrail compute pass.\n // =============================================================\n const blurAgentsTrailComputePass = encoder.beginComputePass({\n label: 'blur agents trail: begin compute pass',\n });\n blurAgentsTrailComputePass.setPipeline(blurAgentsTrailPipeline);\n blurAgentsTrailComputePass.setBindGroup(0, blurAgentsTrailBindGroup);\n blurAgentsTrailComputePass.dispatchWorkgroups(\n // This means we need to create 8x8 workgroups in compute shader.\n canvas.width / 8,\n canvas.height / 8,\n );\n blurAgentsTrailComputePass.end();\n\n // =============================================================\n // Copy blur agents trail from storage -> read texture.\n // =============================================================\n encoder.copyTextureToTexture(\n { texture: gpuTextureForStorage }, // Source\n { texture: gpuTextureForRead }, // Destination\n [canvas.width, canvas.height, 1], // Size (width, height, depthOrArrayLayers)\n );\n\n // =============================================================\n // 4. Run the drawAgents (to canvas) render pass.\n // =============================================================\n const drawAgentsRenderPass = encoder.beginRenderPass({\n label: 'draw agents: begin render pass',\n colorAttachments: [\n {\n view: context.getCurrentTexture().createView(),\n loadOp: 'clear',\n storeOp: 'store',\n clearValue: { r: 0, g: 0, b: 0, a: 1 },\n },\n ],\n });\n drawAgentsRenderPass.setPipeline(drawAgentsRenderPipeline);\n drawAgentsRenderPass.setBindGroup(0, drawAgentsBindGroup);\n drawAgentsRenderPass.draw(6);\n drawAgentsRenderPass.end();\n\n // =============================================================\n // Final step.\n // =============================================================\n device.queue.submit([encoder.finish()]);\n\n // =============================================================\n // Keep track of rafId for the cleanUp fn.\n // =============================================================\n rafId = requestAnimationFrame(render);\n };\n\n // =============================================================\n // Run the render loop.\n // =============================================================\n render();\n};\n\nconst cleanUp = () => {\n initializedPane.dispose();\n cancelAnimationFrame(rafId);\n};\n\nexport { main, cleanUp };\n" }, { "path": "src/slime-mold/shaders/common-uniforms.wgsl", "content": "struct SlimeSimUniformsStruct {\n resolution: vec2f,\n\n // general\n radius: f32,\n stepSize: f32,\n decayT: f32,\n\n // sensor\n sensorOffset: f32,\n sensorAngle: f32,\n rotationAngle: f32,\n\n // other\n diffuseKernel: f32,\n};\n\nstruct ColorizationUniformsStruct {\n blurTrail: f32,\n enableLighting: f32,\n slimeColor: vec3f,\n};\n" }, { "path": "src/slime-mold/shaders/compute-01-update-agents.wgsl", "content": "// =============================================================\n// Compute pass 1 -> update agents.\n// =============================================================\nstruct Agent {\n position: vec2f,\n direction: vec2f,\n}\n\n@group(0) @binding(0) var uSlimeSim: SlimeSimUniformsStruct;\n@group(0) @binding(1) var agentsArray: array;\n@group(0) @binding(2) var readFromThisTexture: texture_2d;\n@group(0) @binding(3) var writeToThisTexture: texture_storage_2d;\n\nfn rotationMatrix(degrees: f32) -> mat2x2f {\n let radians = radians(degrees); // Convert degrees to radians\n let cosTheta = cos(radians);\n let sinTheta = sin(radians);\n return mat2x2f(\n vec2f(cosTheta, -sinTheta),\n vec2f(sinTheta, cosTheta)\n );\n}\n\nfn rotate(direction: vec2f, degrees: f32) -> vec2f {\n let rotMatrix = rotationMatrix(degrees);\n return rotMatrix * direction;\n}\n\nfn checkTrail(agentPosition: vec2f, newDir: vec2f) -> f32 {\n var sum: f32 = 0.0;\n let sensorWidth: i32 = 1;\n let sensorPosition = agentPosition + uSlimeSim.sensorOffset * newDir;\n\n for (var x = -sensorWidth; x <= sensorWidth; x++) {\n for (var y = -sensorWidth; y <= sensorWidth; y++) {\n let sampleX = i32(sensorPosition.x) + x;\n let sampleY = i32(sensorPosition.y) + y;\n sum += textureLoad(readFromThisTexture, vec2i(sampleX, sampleY), 0).r;\n }\n }\n\n return sum;\n}\n\n// takes a value and converts it between 0 and 1\nfn hashTo01(value: u32) -> u32 {\n return (value * 2654435761u) % 2u; // Use a prime multiplier for hashing\n}\n\n@compute\n@workgroup_size(1)\nfn updateAgents(\n @builtin(global_invocation_id) id: vec3u\n) {\n let idx = id.x; // Index for the current workgroup invocation\n if (idx < arrayLength(&agentsArray)) {\n // =============================================================\n // 1. Motor stage -> update agents position.\n // reference: https://uwe-repository.worktribe.com/output/980579\n // =============================================================\n let uResolution: vec2f = uSlimeSim.resolution;\n let agentPosition: vec2f = agentsArray[idx].position;\n if (agentPosition.x < 0 || agentPosition.x > uResolution.x) {\n agentsArray[idx].direction.x *= -1.0;\n }\n if (agentPosition.y < 0 || agentPosition.y > uResolution.y) {\n agentsArray[idx].direction.y *= -1.0;\n }\n // In this case, we specifically want to use agents[idx].direction because that\n // is being changed, where as the local `agent` variable is not.\n // Make sure to normalize direction becaues otherwise, some agents move very slow.\n agentsArray[idx].position = agentPosition + normalize(agentsArray[idx].direction) * uSlimeSim.stepSize;\n\n // =============================================================\n // 2. Sensory stage -> update agents direction based on sensors.\n // reference: https://uwe-repository.worktribe.com/output/980579\n //\n // Lets say that abs(maxDegrees) = 145\n // Add degrees to go left, subtract degrees to go right.\n // =============================================================\n let uSensorAngle = uSlimeSim.sensorAngle;\n let sensorDegreeLeft = uSensorAngle;\n let sensorDegreeRight = -uSensorAngle;\n\n let sensorForwardDir = normalize(agentsArray[idx].direction);\n let sensorLeftDir = rotate(sensorForwardDir, sensorDegreeLeft);\n let sensorRightDir = rotate(sensorForwardDir, sensorDegreeRight);\n\n let F: f32 = checkTrail(agentsArray[idx].position, sensorForwardDir);\n let FL: f32 = checkTrail(agentsArray[idx].position, sensorLeftDir);\n let FR: f32 = checkTrail(agentsArray[idx].position, sensorRightDir);\n\n // // lets say that abs(maxDegrees) = 145\n // // add degrees to go left, subtract degrees to go right\n let uRotationAngle = uSlimeSim.rotationAngle;\n let rotationDegreeLeft = uRotationAngle;\n let rotationDegreeRight = -uRotationAngle;\n\n let rotationForwardDir = normalize(agentsArray[idx].direction);\n let rotationLeftDir = rotate(rotationForwardDir, rotationDegreeLeft);\n let rotationRightDir = rotate(rotationForwardDir, rotationDegreeRight);\n\n if (F > FL && F > FR) {\n // do nothing\n } else if (F < FL && F < FR) {\n let zeroOrOne = f32(hashTo01(u32(F + FR + FL)));\n if (zeroOrOne < 0.1) {\n agentsArray[idx].direction = rotationLeftDir;\n } else {\n agentsArray[idx].direction = rotationRightDir;\n }\n } else if (FL < FR) {\n agentsArray[idx].direction = rotationRightDir;\n } else if (FR < FL) {\n agentsArray[idx].direction = rotationLeftDir;\n } else {\n // do nothing\n }\n }\n\n // =============================================================\n // 3. Draw white dot with uSlimeSim.radius on texture.\n // =============================================================\n let white = vec4f(1.0, 1.0, 1.0, 1.0);\n let agentCenterPos = vec2i(agentsArray[id.x].position);\n\n // Setting radius to decimal, like, 2.5 makes it an f32.\n // Type f32 doesn't allow x++ or y++ which is annoying in for-loops.\n // But type f32 can be useful if we want to make a circular agent with\n // a smaller radius since we can perform checks by incrementing 0.5\n // units in the for-loop.\n let uRadius = uSlimeSim.radius;\n let rSquared = uRadius * uRadius;\n for (var x = -uRadius; x <= uRadius; x += 0.5) {\n for (var y = -uRadius; y <= uRadius; y += 0.5) {\n let offset = vec2f(x, y);\n let offsetDotProduct = dot(offset, offset);\n if (offsetDotProduct < rSquared) {\n // We need to cast offset to i32 since textureStore takes vec2i.\n // agentCenterPos has already been cast during initialization.\n let texelCoordToColorize = agentCenterPos + vec2i(offset);\n textureStore(writeToThisTexture, texelCoordToColorize, white);\n }\n }\n }\n}\n" }, { "path": "src/slime-mold/shaders/compute-02-fade-agents-trail.wgsl", "content": "// =============================================================\n// Compute pass 2 -> fade agents trail.\n// =============================================================\n@group(0) @binding(0) var uSlimeSim: SlimeSimUniformsStruct;\n@group(0) @binding(1) var readFromThisTexture: texture_2d;\n@group(0) @binding(2) var writeToThisTexture: texture_storage_2d;\n\n@compute\n@workgroup_size(1)\nfn fadeAgentsTrail(\n @builtin(global_invocation_id) id: vec3u,\n) {\n let currTextureColor = textureLoad(readFromThisTexture, id.xy, 0).rgb;\n let newTextureColor = currTextureColor - uSlimeSim.decayT;\n textureStore(writeToThisTexture, id.xy, vec4f(newTextureColor, 1.0));\n}\n" }, { "path": "src/slime-mold/shaders/compute-03-blur-agents-trail.wgsl", "content": "// =============================================================\n// Compute pass 3 -> blur agents trail.\n// =============================================================\n@group(0) @binding(0) var uSlimeSim: SlimeSimUniformsStruct;\n@group(0) @binding(1) var uColorization: ColorizationUniformsStruct;\n@group(0) @binding(2) var readFromThisTexture: texture_2d;\n@group(0) @binding(3) var writeToThisTexture: texture_storage_2d;\n\n@compute\n@workgroup_size(8, 8)\nfn blurAgentsTrail(\n @builtin(global_invocation_id) id: vec3u,\n) {\n var newTextureColor = vec4f(0.0);\n let uBlurTrail = uColorization.blurTrail;\n let uCanvasSize = vec2u(uSlimeSim.resolution);\n\n // Avoid out-of-bounds access.\n if (id.x >= uCanvasSize.x || id.y >= uCanvasSize.y) {\n return;\n }\n\n // Seems like booleans cannot be passed as uniforms in a gpu buffer.\n // If blurTrail value is equal to 0, do not blur the texture.\n if (uBlurTrail < 1.0) {\n newTextureColor = textureLoad(readFromThisTexture, vec2i(id.xy), 0);\n } else {\n // todo: why does this loop seem slower?\n // var pixelCount = 0.0;\n // for (var x = -1; x <= 1; x++) {\n // for (var y = -1; y <= 1; y++) {\n // var currPos = vec2i(id.xy) + vec2i(x, y);\n // newTextureColor += textureLoad(readFromThisTexture, currPos, 0);\n // pixelCount += 1;\n // }\n // }\n // newTextureColor = newTextureColor / pixelCount;\n\n // this seems faster?\n var currPos = vec2i(id.xy);\n newTextureColor += textureLoad(readFromThisTexture, currPos + vec2i(-1, 1), 0);\n newTextureColor += textureLoad(readFromThisTexture, currPos + vec2i(0, 1), 0);\n newTextureColor += textureLoad(readFromThisTexture, currPos + vec2i(1, 1), 0);\n newTextureColor += textureLoad(readFromThisTexture, currPos + vec2i(-1, 0), 0);\n newTextureColor += textureLoad(readFromThisTexture, currPos + vec2i(0, 0), 0);\n newTextureColor += textureLoad(readFromThisTexture, currPos + vec2i(1, 0), 0);\n newTextureColor += textureLoad(readFromThisTexture, currPos + vec2i(-1, -1), 0);\n newTextureColor += textureLoad(readFromThisTexture, currPos + vec2i(0, -1), 0);\n newTextureColor += textureLoad(readFromThisTexture, currPos + vec2i(1, -1), 0);\n newTextureColor /= 9.0;\n }\n\n textureStore(writeToThisTexture, id.xy, newTextureColor);\n}\n" }, { "path": "src/slime-mold/shaders/render-01-draw-agents.wgsl", "content": "// =============================================================\n// Draw agents render pass: vertex shader.\n// =============================================================\n@vertex\nfn vertexShader(\n @builtin(vertex_index) index: u32\n) -> @builtin(position) vec4f {\n var positions = array(\n vec4(-1.0, -1.0, 0.0, 1.0),\n vec4( 1.0, -1.0, 0.0, 1.0),\n vec4(-1.0, 1.0, 0.0, 1.0),\n\n vec4( 1.0, -1.0, 0.0, 1.0),\n vec4( 1.0, 1.0, 0.0, 1.0),\n vec4(-1.0, 1.0, 0.0, 1.0)\n );\n return positions[index];\n}\n\n// =============================================================\n// Draw agents render pass: fragment shader.\n// =============================================================\n@group(0) @binding(0) var uSlimeSim: SlimeSimUniformsStruct;\n@group(0) @binding(1) var uColorization: ColorizationUniformsStruct;\n@group(0) @binding(2) var readFromThisTexture: texture_2d;\n\nfn calculateNormal(uv: vec2f) -> vec3f {\n // Sample neighboring pixels\n let h_x1 = textureLoad(readFromThisTexture, vec2i(uv) + vec2i(1, 0), 0).r;\n let h_x0 = textureLoad(readFromThisTexture, vec2i(uv) - vec2i(1, 0), 0).r;\n let h_y1 = textureLoad(readFromThisTexture, vec2i(uv) + vec2i(0, 1), 0).r;\n let h_y0 = textureLoad(readFromThisTexture, vec2i(uv) - vec2i(0, 1), 0).r;\n\n // Calculate gradients\n let strength = 2.0;\n let grad_x = (h_x1 - h_x0) * strength;\n let grad_y = (h_y1 - h_y0) * strength;\n\n // Compute and normalize the normal\n return normalize(vec3f(-grad_x, -grad_y, -1.0));\n}\n\n@fragment\nfn fragmentShader(\n @builtin(position) fragCoord:vec4f\n) -> @location(0) vec4f {\n // =============================================================\n // Create the checkerboard pattern.\n // =============================================================\n let checkerBoardUv = (2.0 * fragCoord.xy - uSlimeSim.resolution.xy) / uSlimeSim.resolution.y;\n let checkerBoardGridUv = vec2(floor(checkerBoardUv * 8.0));\n var checkerBoardColor = vec3(0.0);\n if (floor((checkerBoardGridUv.x + checkerBoardGridUv.y) % 2) == 0) {\n checkerBoardColor = vec3(0.125);\n } else {\n checkerBoardColor = vec3(0.0625);\n }\n\n // =============================================================\n // Set up uv coords and get texture color at the current coordinate.\n // =============================================================\n let uv = fragCoord.xy / uSlimeSim.resolution;\n let currTextureColor = textureLoad(readFromThisTexture, vec2i(uv * uSlimeSim.resolution), 0);\n let uSlimeColor = uColorization.slimeColor;\n var fragColor = vec3f(0.0);\n\n // =============================================================\n // Return early if we disabled lighting.\n // =============================================================\n if (uColorization.enableLighting <= 0.0001) {\n // Mix between the checkerboard color, and slime color based on whether or not\n // the texture color is set to white. We can check for this using the r, g, or\n // b channels. Using alpha channel wouldn't make sense because it's always 1.\n fragColor = mix(checkerBoardColor, uSlimeColor, smoothstep(0.0, 1.0, currTextureColor.r));\n return vec4(fragColor, 1.0);\n }\n\n // =============================================================\n // Calculate lighting and stylize the result.\n //\n // Note that negative values for y moves the light source up. WebGPU has y in\n // reverse. Setting y = -0.25, will make light appear at the top-right!\n // =============================================================\n let lightSource = vec3f(0.25, -0.25, -2.0);\n let viewSource = vec3f(0.0, 0.0, -1.0);\n let lightDir = normalize(lightSource);\n let viewDir = normalize(viewSource);\n\n // 32 or 64 seem like good numbers especially with lightSource\n // at vec3f(0.25, 0.25. -2.0). Higher value = sharper highlights.\n let shininess = 64.0;\n let surfaceNormal = calculateNormal(fragCoord.xy);\n let reflection = reflect(-lightDir, surfaceNormal);\n let specularIntensity = pow(max(dot(reflection, viewDir), 0.0), shininess);\n\n // Setting the baseColorIntensity to 0.8, ensures that specular highlights are\n // more easily visible. Setting it to 1.0 would make the specular highlights\n // harder to notice.\n let baseColorIntensity = 0.8;\n let lightColor = vec3f(1.0, 1.0, 1.0);\n let baseColor = uSlimeColor * currTextureColor.rgb * baseColorIntensity;\n let specularColor = lightColor * specularIntensity;\n\n fragColor = baseColor + specularColor;\n fragColor = pow(fragColor, vec3(2.0));\n fragColor = mix(checkerBoardColor, fragColor, smoothstep(0.0, 1.0, currTextureColor.r));\n return vec4f(fragColor, 1.0);\n}\n" }, { "path": "src/slime-mold/uniforms.ts", "content": "const UNIFORMS_SLIME_SIM = {\n // simulation folder\n numOfAgents: {\n value: 20_000,\n label: 'NumOfAgents',\n min: 1_000,\n max: 60_000,\n step: 10_000,\n },\n startRadius: {\n value: 100,\n label: 'StartRadius',\n min: 50,\n max: 250,\n step: 50,\n },\n\n // general folder\n radius: {\n // The tweakpane UI shows 1 -> 3, but it's actually doing 0.5 -> 2.5\n // Not sure if this is a bug with the library.\n value: 1.5,\n label: 'AgentSize',\n min: 0.5,\n max: 1.5,\n step: 1,\n },\n stepSize: {\n value: 0.75,\n label: 'AgentSpeed',\n min: 0,\n max: 1.5,\n step: 0.25,\n },\n decayT: {\n value: 0.005,\n label: 'TrailDecay',\n min: 0.005,\n max: 0.025,\n step: 0.005,\n },\n\n // sensor settings folder\n sensorOffset: {\n value: 8,\n label: 'SensorOffset',\n min: 0,\n max: 20,\n step: 2,\n },\n sensorAngle: {\n value: 45,\n label: 'SensorAngle',\n min: 5,\n max: 135,\n step: 5,\n },\n rotationAngle: {\n value: 45,\n label: 'RotationAngle',\n min: 5,\n max: 135,\n step: 5,\n },\n\n // todo: implement these fields?\n // sensorWidth: 1, // not really useful?\n // diffuseKernel: 0, // blur radius, not really useful?\n // pCD: 0, // probability of random change in direction\n};\n\nconst UNIFORMS_COLORIZATION = {\n blurTrail: {\n value: false,\n label: 'BlurTrail',\n },\n enableLighting: {\n value: true,\n label: 'Lighting',\n },\n slimeColor: {\n value: { r: 255, g: 0, b: 0 },\n label: 'SlimeColor',\n picker: 'inline',\n // expanded: true,\n },\n};\n\nexport { UNIFORMS_SLIME_SIM, UNIFORMS_COLORIZATION };\n" }, { "path": "src/vite-env.d.ts", "content": "/// \n" }, { "path": "tailwind.config.js", "content": "/** @type {import('tailwindcss').Config} */\nexport default {\n content: ['./index.html', './src/**/*.{js,ts,jsx,tsx}'],\n theme: {\n extend: {},\n },\n plugins: [],\n};\n" }, { "path": "tsconfig.app.json", "content": "{\n \"compilerOptions\": {\n \"tsBuildInfoFile\": \"./node_modules/.tmp/tsconfig.app.tsbuildinfo\",\n \"target\": \"ES2020\",\n \"useDefineForClassFields\": true,\n \"lib\": [\"ES2020\", \"DOM\", \"DOM.Iterable\"],\n \"module\": \"ESNext\",\n \"skipLibCheck\": true,\n\n /* Bundler mode */\n \"moduleResolution\": \"Bundler\",\n \"allowImportingTsExtensions\": true,\n \"isolatedModules\": true,\n \"moduleDetection\": \"force\",\n \"noEmit\": true,\n \"jsx\": \"react-jsx\",\n\n /* Linting */\n \"strict\": true,\n \"noUnusedLocals\": true,\n \"noUnusedParameters\": true,\n \"noFallthroughCasesInSwitch\": true,\n \"noUncheckedSideEffectImports\": true,\n\n \"types\": [\"@webgpu/types\"]\n },\n \"include\": [\"src\"]\n}\n" }, { "path": "tsconfig.json", "content": "{\n \"files\": [],\n \"references\": [\n { \"path\": \"./tsconfig.app.json\" },\n { \"path\": \"./tsconfig.node.json\" }\n ]\n}\n" }, { "path": "tsconfig.node.json", "content": "{\n \"compilerOptions\": {\n \"tsBuildInfoFile\": \"./node_modules/.tmp/tsconfig.node.tsbuildinfo\",\n \"target\": \"ES2022\",\n \"lib\": [\"ES2023\"],\n \"module\": \"ESNext\",\n \"skipLibCheck\": true,\n\n /* Bundler mode */\n \"moduleResolution\": \"Bundler\",\n \"allowImportingTsExtensions\": true,\n \"isolatedModules\": true,\n \"moduleDetection\": \"force\",\n \"noEmit\": true,\n\n /* Linting */\n \"strict\": true,\n \"noUnusedLocals\": true,\n \"noUnusedParameters\": true,\n \"noFallthroughCasesInSwitch\": true,\n \"noUncheckedSideEffectImports\": true\n },\n \"include\": [\"vite.config.ts\"]\n}\n" }, { "path": "vite.config.ts", "content": "import { defineConfig } from 'vite';\nimport react from '@vitejs/plugin-react';\n\n// https://vite.dev/config/\nexport default defineConfig({\n plugins: [react()],\n base: '/slime-sim-webgpu',\n});\n" } ]