🏀 SportsBallEngine

A high-performance, cross-platform 3D game engine written in Swift 6, designed for professional sports games across multiple disciplines. Built with strict platform abstraction and protocol-oriented design.

🎯 Design Philosophy

Clean Architecture

This engine follows industry-standard architectural principles:

1. Strict Code Separation

   • Platform-Agnostic Core: Pure Swift modules with NO platform-specific imports
   • Platform Abstraction Layers (PAL): Thin, platform-specific modules that interact with OS APIs

2. Protocol-Oriented Design

   • All platform-dependent systems use Swift protocols
   • EngineCore depends only on protocols, never concrete implementations
   • Platform layers are dependency-injected at startup

3. Explicit Rendering APIs

   • Vulkan (primary cross-platform)
   • DirectX 12 (Windows optimization)
   • Metal (future macOS support)

🏗️ Architecture

┌─────────────────────────────────────────────────────────┐
│                      main.swift                         │
│           (Platform Detection & Injection)              │
└────────────┬────────────────────────────────────────────┘
             │
             ├──────────────┬──────────────┬──────────────┐
             │              │              │              │
             ▼              ▼              ▼              ▼
     ┌──────────────┐ ┌──────────┐ ┌──────────┐ ┌──────────┐
     │ EngineCore   │ │ Renderer │ │  Window  │ │  Input   │
     │ (Protocol-   │ │ Protocol │ │ Protocol │ │ Protocol │
     │  Agnostic)   │ └──────────┘ └──────────┘ └──────────┘
     └───┬──────────┘      │             │             │
         │                 │             │             │
         ├─────────┬───────┘             │             │
         │         │                     │             │
         ▼         ▼                     ▼             ▼
   ┌─────────┐ ┌─────────┐      ┌─────────────┐ ┌─────────────┐
   │ Physics │ │  Asset  │      │ Linux/Win32 │ │ Linux/Win32 │
   │ Engine  │ │ Loader  │      │   Window    │ │    Input    │
   └─────────┘ └─────────┘      └─────────────┘ └─────────────┘
                                          │
                                          ▼
                                 ┌─────────────────┐
                                 │ Vulkan / DX12   │
                                 │    Renderer     │
                                 └─────────────────┘

📦 Module Structure

Platform-Agnostic Core Modules

EngineCore

• Main game loop (Carmack-style fixed timestep)
• Scene management
• System coordination
• NO platform imports allowed

RendererAPI

• Protocol definitions for rendering
• Camera, Scene, Entity types
• Vertex, Mesh, Material handles
• NO platform imports allowed

PhysicsEngine

• Sports-optimized physics simulation
• Ball/puck physics with spin and drag
• Player collision detection
• Impulse-based collision resolution
• NO platform imports allowed

AssetLoader

• 3D model loading (FBX, GLTF, OBJ)
• Texture loading (DDS, PNG, JPG)
• Skeletal animation data
• Animation blending system
• NO platform imports allowed

Platform-Specific Modules

PlatformLinux

• GLFW/SDL windowing (X11/Wayland)
• Linux input handling
• ALSA/PulseAudio audio

PlatformWin32

• Win32 API windowing
• Raw Input / XInput
• WASAPI/XAudio2 audio

VulkanRenderer

• Vulkan 1.3 rendering backend
• Cross-platform (Linux + Windows)
• Explicit GPU resource management

DX12Renderer

• DirectX 12 rendering backend
• Windows-optimized path
• Low-level GPU control

🎮 Sports Game Optimizations

This engine is specifically designed for professional sports games across multiple disciplines:

Character Rendering

• High-fidelity player models with PBR materials
• Skeletal animation with smooth blending
• State machine-driven movement (running, shooting, tackling)
• Facial animation support

Physics

• Fast ball/puck simulation with spin
• Player-to-player collision detection
• Ball-to-player interaction physics
• Field boundaries and out-of-bounds detection

Rendering

• Large stadium/arena rendering with LOD
• Crowd rendering and animation
• Dynamic lighting for different times of day
• Particle effects (grass, dust, sweat)

Performance

• Fixed timestep physics (60 Hz)
• Multithreaded asset streaming
• GPU-driven rendering
• Spatial culling and occlusion

🚀 Building & Running

Prerequisites

• Swift 6.0+
• Platform-specific dependencies:
  • Linux: Vulkan SDK, GLFW/SDL
  • Windows: DirectX 12 SDK, GLFW/SDL or Win32 API

Build Commands

# Build the engine
swift build

# Build release version
swift build -c release

# Run the engine
swift run

# Run with options
swift run SportsBallEngine -- --renderer vulkan --width 2560 --height 1440

Command-Line Options

Usage: SportsBallEngine [OPTIONS]

Options:
  --renderer, -r <api>     Renderer API (vulkan, dx12) [Windows only]
  --title, -t <title>      Window title
  --width, -w <pixels>     Window width (default: 1920)
  --height, -h <pixels>    Window height (default: 1080)
  --help                   Show this help message

Examples:
  SportsBallEngine --renderer vulkan --width 2560 --height 1440
  SportsBallEngine --title "My Sports Game"

🔧 Development

Adding New Platform Support

1. Create new module: Sources/Platform{Name}/
2. Implement protocols: WindowManager, InputHandler, AudioEngine
3. Add to PlatformFactory in main.swift
4. Update Package.swift dependencies

Adding New Renderer

1. Create new module: Sources/{API}Renderer/
2. Implement Renderer protocol from RendererAPI
3. Add to PlatformFactory.createRenderer()
4. Update Package.swift dependencies

Project Structure

SportsBallEngine_1/
├── Package.swift              # Swift Package Manager manifest
├── README.md                  # This file
├── Sources/
│   ├── SportsBallEngine/     # Main entry point
│   │   └── main.swift
│   ├── EngineCore/           # Platform-agnostic core
│   │   └── Engine.swift
│   ├── RendererAPI/          # Protocol definitions
│   │   ├── RendererProtocol.swift
│   │   ├── InputProtocol.swift
│   │   ├── WindowProtocol.swift
│   │   └── AudioProtocol.swift
│   ├── PhysicsEngine/        # Physics simulation
│   │   └── PhysicsWorld.swift
│   ├── AssetLoader/          # Asset management
│   │   └── AssetManager.swift
│   ├── VulkanRenderer/       # Vulkan backend
│   │   └── VulkanRenderer.swift
│   ├── DX12Renderer/         # DirectX 12 backend
│   │   └── DX12Renderer.swift
│   ├── PlatformLinux/        # Linux platform layer
│   │   └── LinuxPlatform.swift
│   └── PlatformWin32/        # Windows platform layer
│       └── Win32Platform.swift
└── Tests/
    └── EngineCoreTests/

🎯 Sports Game Features (Roadmap)

Phase 1: Core Engine ✅

• Platform abstraction layer
• Renderer protocols (Vulkan, DX12)
• Physics engine
• Asset loading system
• Main game loop

Phase 2: Sports-Specific Features

• Skeletal animation system
• Animation blending
• State machines for player AI
• Ball physics with spin
• Stadium rendering
• Crowd simulation

Phase 3: Advanced Features

• Networking (multiplayer)
• Replay system
• Statistics tracking
• Dynamic weather
• Commentary system

📝 License

Copyright (c) 2025. All rights reserved.

🙏 Acknowledgments

• Swift Community - For excellent cross-platform support
• Open Source Contributors - For graphics API bindings and tooling

---

Note: This is a foundational structure. Renderer implementations are currently stubs that demonstrate the architecture. Production use would require:

• Actual Vulkan/DirectX 12 C bindings
• Complete shader pipeline
• Full asset format parsers
• Advanced physics optimizations
• Networking layer

The architecture is production-ready; the implementations are educational scaffolding.