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RFC 0002: Implementation Tasks — WebGPU Particle Fluid Simulation

Status: Maintenance Mode Last Updated: 2026-04-16 Version: 2.0.0 Related Specs: Product Requirements | Core Architecture RFC

Overview

This document tracks the implementation tasks for the WebGPU Particle Fluid Simulation. All tasks have been completed.

TASK-1.1 Initialize Vite + TypeScript project
- Created project using Vite vanilla-ts template
- Configured TypeScript with strict mode
- Added @webgpu/types for type definitions
- Validates: REQ-1
TASK-1.2 Create project structure
- Created src/config/ for simulation constants
- Created src/core/ for main modules
- Created src/shaders/ for WGSL files
- Created src/types.ts for interfaces
- Validates: REQ-1, REQ-2

TASK-2.1 Implement WebGPU initialization
- Created src/core/webgpu.ts
- Implemented initWebGPU() function
- Added error handling for unsupported browsers
- Validates: REQ-1.1, REQ-1.2, REQ-1.4
TASK-2.2 Implement canvas configuration
- Implemented fullscreen canvas setup
- Added HiDPI support via devicePixelRatio
- Added resize event handling
- Validates: REQ-1.3

TASK-3.1 Implement particle physics (CPU reference)
- Created src/core/physics.ts
- Implemented updateParticle() pure function
- Implemented helper functions for gravity, bounce, repulsion
- Validates: REQ-3.1, REQ-3.2, REQ-3.4, REQ-4.2, REQ-4.3
TASK-3.2 Write physics property tests
- Created src/core/physics.test.ts
- Property tests for physics integration
- Property tests for boundary bounce
- Property tests for repulsion force
- Validates: REQ-3.1, REQ-3.2, REQ-4.2, REQ-4.3
TASK-3.3 Implement GPU buffer management
- Created src/core/buffers.ts
- Implemented createParticleBuffer() for storage
- Implemented createUniformBuffer() for uniforms
- Implemented initializeParticles() for random init
- Validates: REQ-2.1, REQ-2.2, REQ-2.3, REQ-2.4
TASK-3.4 Write buffer property tests
- Created src/core/buffers.test.ts
- Property tests for particle bounds
- Validates: REQ-2.3

TASK-4.1 Implement compute shader
- Created src/shaders/compute.wgsl
- Implemented gravity, repulsion, bounce logic
- Aligned with CPU physics implementation
- Validates: REQ-3.1, REQ-3.2, REQ-3.4, REQ-4.2, REQ-4.3
TASK-4.2 Implement render shader
- Created src/shaders/render.wgsl
- Implemented vertex shader (position → NDC)
- Implemented fragment shader (velocity → color)
- Validates: REQ-5.1, REQ-5.2, REQ-5.3, REQ-5.4
TASK-4.3 Implement color mapping (CPU reference)
- Created src/core/color.ts
- Implemented velocityToColor() function
- Validates: REQ-5.2, REQ-5.3, REQ-5.4
TASK-4.4 Write color property tests
- Created src/core/color.test.ts
- Property tests for color mapping
- Validates: REQ-5.2, REQ-5.3, REQ-5.4
TASK-4.5 Implement trail shader
- Created src/shaders/trail.wgsl
- Implemented fullscreen fade quad
- Validates: REQ-6.2
TASK-4.6 Implement present shader
- Created src/shaders/present.wgsl
- Implemented texture sampling and compositing
- Validates: REQ-6.4

TASK-5.1 Implement compute pipeline
- Created src/core/pipelines.ts
- Implemented compute pipeline creation
- Created bind group layouts
- Validates: REQ-3.3
TASK-5.2 Implement render pipeline
- Implemented render pipeline creation
- Configured point topology and blending
- Created bind groups
- Validates: REQ-5.1
TASK-5.3 Implement trail pipeline
- Implemented trail pipeline creation
- Configured triangle strip topology
- Validates: REQ-6.2
TASK-5.4 Implement present pipeline
- Implemented present pipeline creation
- Configured texture sampling
- Validates: REQ-6.4

TASK-6.1 Implement input handling
- Created src/core/input.ts
- Implemented mouse event handling
- Implemented touch event handling
- Added HiDPI coordinate mapping
- Validates: REQ-4.1, REQ-4.4
TASK-6.2 Implement render loop
- Created src/core/renderer.ts
- Implemented frame loop with RAF
- Implemented 4-pass rendering sequence
- Implemented delta time calculation
- Validates: REQ-6.1, REQ-6.3, REQ-7.1, REQ-7.2, REQ-7.3, REQ-7.4

TASK-7.1 Implement quality heuristics
- Created src/core/quality.ts
- Implemented device capability detection
- Implemented particle count scaling
- Validates: REQ-8.1, REQ-8.2, REQ-8.3, REQ-8.4
TASK-7.2 Write quality tests
- Created src/core/quality.test.ts
- Tests for scaling scenarios
- Validates: REQ-8.1-8.4

TASK-8.1 Centralize simulation constants
- Created src/config/sim.ts
- Defined all simulation constants
- Implemented WGSL preamble builders
- Validates: REQ-2.1-2.4, REQ-3.4, REQ-4.2

TASK-9.1 Create main entry point
- Created src/main.ts
- Integrated all modules
- Added FPS counter and info overlay
- Validates: All REQs
TASK-9.2 Add styles and HTML
- Created src/style.css
- Updated index.html
- Added error display styles
- Validates: REQ-1.3, REQ-1.4

TASK-10.1 Create README documentation
- Created README.md (English)
- Created README.zh-CN.md (Chinese)
- Validates: NFR-8
TASK-10.2 Create API documentation
- Created docs/API.md
- Documented all public interfaces
- Validates: NFR-8
TASK-10.3 Create contributing guide
- Created CONTRIBUTING.md
- Documented development workflow
- Validates: NFR-8

Task	Frequency	Description
Dependency Updates	Weekly	Review and merge Dependabot PRs
Security Audits	Monthly	Run `npm audit` and address findings
Performance Testing	Per Release	Benchmark on reference devices
Documentation Review	Per Release	Verify docs match current code

When adding new tasks: