GroveEngine 🌳

Modular C++ Engine Architecture for Rapid Development with Hot-Reload

GroveEngine is a lightweight, modular engine architecture designed for blazing-fast development iteration (0.4ms hot-reload validated) and optimized for Claude Code workflows.

Key Features

• 🔥 Hot-Reload 0.4ms - Validated blazing-fast module reloading
• 🧩 Modular Architecture - Clean separation via interfaces (IEngine, IModule, IIO, IModuleSystem)
• 🚀 Development Velocity - Edit → Build → Hot-reload < 1 second total
• 🤖 Claude Code Optimized - 200-300 line modules for AI-friendly development
• 📦 Autonomous Builds - Each module builds independently (cmake .)
• 🔌 Progressive Scaling - Debug → Production → Cloud without rewriting

Architecture Overview

grove::IEngine (Orchestration)
├── grove::IModuleSystem (Execution strategy)
│   ├── SequentialModuleSystem (Debug/test - 1 module at a time)
│   ├── ThreadedModuleSystem (Each module in thread - TODO)
│   └── MultithreadedModuleSystem (Thread pool - TODO)
├── grove::IModule (Business logic - 200-300 lines)
│   └── Your modules (.so/.dll hot-reloadable)
└── grove::IIO (Communication)
    ├── IntraIO (Same process - validated)
    ├── LocalIO (Same machine - TODO)
    └── NetworkIO (Distributed - TODO)

Current Status

✅ Implemented & Validated

• Core Interfaces (13): IEngine, IModule, IModuleSystem, IIO, ICoordinationModule, ITaskScheduler, IDataTree, IDataNode, IUI, ISerializable
• Debug Implementations (Phase 2 - Pre-IDataTree):
  • DebugEngine - Comprehensive logging and health monitoring
  • SequentialModuleSystem - Ultra-lightweight execution
  • IntraIO + IntraIOManager - Sub-millisecond pub/sub with pattern matching
  • ModuleFactory - Dynamic .so/.dll loading system
  • EngineFactory, ModuleSystemFactory, IOFactory - Factory patterns
• Hot-Reload System - 0.4ms average, 0.055ms best performance, perfect state preservation
• UI System - ImGuiUI implementation with hybrid sizing

⚠️ Compatibility Note

Current implementations use pre-IDataTree API (json config). The architecture evolved to use IDataNode for configuration. Implementations need adaptation or recreation for full IDataTree compatibility.

🚧 TODO

• Adapt implementations to use IDataTree/IDataNode instead of json
• Implement ThreadedModuleSystem and MultithreadedModuleSystem
• Implement LocalIO and NetworkIO
• Create concrete IDataTree implementations (JSONDataTree, etc.)

Quick Start

Try the Interactive Demo

See it in action first! Run the full stack demo to see BgfxRenderer + UIModule + InputModule working together:

# Windows
run_full_stack_demo.bat

# Linux
./build/tests/test_full_stack_interactive

Features:

• Click buttons, drag sliders, interact with UI
• Spawn bouncing sprites with physics
• Complete input → UI → game → render flow
• All IIO topics demonstrated

See tests/visual/README_FULL_STACK.md for details.

Directory Structure

GroveEngine/
├── include/grove/          # 27 headers
│   ├── IEngine.h          # Core interfaces
│   ├── IModule.h
│   ├── IModuleSystem.h
│   ├── IIO.h
│   ├── IDataTree.h        # Configuration system
│   ├── IDataNode.h
│   └── ...
├── src/                    # 10 implementations
│   ├── DebugEngine.cpp
│   ├── SequentialModuleSystem.cpp
│   ├── IntraIO.cpp
│   ├── ModuleFactory.cpp
│   └── ...
├── docs/                   # Documentation
│   ├── architecture/
│   │   ├── architecture-modulaire.md
│   │   └── claude-code-integration.md
│   └── implementation/
│       └── CLAUDE-HOT-RELOAD-GUIDE.md
├── modules/                # Your application modules
├── tests/                  # Tests
└── CMakeLists.txt         # Build system

Build

cd GroveEngine
mkdir build && cd build
cmake ..
make

# Or use the root CMakeLists.txt directly
cmake .
make

Create a Module

// MyModule.h
#include <grove/IModule.h>

class MyModule : public grove::IModule {
public:
    json process(const json& input) override {
        // Your logic here (200-300 lines max)
        return {"result": "processed"};
    }

    void setConfiguration(const IDataNode& config, IIO* io, ITaskScheduler* scheduler) override {
        // Configuration setup
    }

    // ... other interface methods
};

Documentation

For Developers Using GroveEngine

• DEVELOPER_GUIDE.md - 📘 START HERE - Complete guide with modules, IIO topics, and full examples
• USER_GUIDE.md - Module system basics, hot-reload, IIO communication

Module Documentation

• BgfxRenderer - 2D rendering (sprites, text, tilemap, particles)
• UIModule - User interface (10 widget types, layout, scrolling)
• InputModule - Input handling (mouse, keyboard, gamepad)

Architecture & Internals

• Architecture Modulaire - Core interface architecture
• Claude Code Integration - AI-optimized development workflow
• Hot-Reload Guide - 0.4ms hot-reload system

Philosophy

Micro-Context Development

• Small modules (200-300 lines) for AI-friendly development
• Autonomous builds - Zero parent dependencies
• Hot-swappable infrastructure - Change performance without touching business logic

Progressive Evolution

// Start simple (MVP)
DebugEngine + SequentialModuleSystem + IntraIO

// Scale transparently (same module code)
HighPerfEngine + MultithreadedModuleSystem + NetworkIO

Complexity Through Simplicity

Complex behavior emerges from the interaction of simple, well-defined modules.

Performance

Hot-Reload Benchmarks (Validated):

• Average: 0.4ms
• Best: 0.055ms
• 5-cycle test: 2ms total
• State persistence: 100% success rate
• Classification: 🚀 BLAZING (Theoretical maximum achieved)

Projects Using GroveEngine

• AISSIA - AI Smart Schedule & Interactive Assistant (in development)
• WarFactory (original architecture source)

License

To be defined

Contributing

This engine uses an architecture optimized for Claude Code development. Each module is autonomous and can be developed independently.

Constraints:

• ✅ Modules 200-300 lines maximum
• ✅ Autonomous build: cmake . from module directory
• ✅ JSON-only communication between modules
• ✅ Zero dependencies up (no #include "../")
• ❌ Never cmake ..

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GroveEngine - Where modules grow like trees in a grove 🌳