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# Donut Engine
A modern C++ game engine with OpenGL rendering and ImGUI integration.
## Features
- **OpenGL Rendering**: Modern OpenGL 4.6 with GLAD loader
- **GLFW Window Management**: Cross-platform window and input handling
- **ImGUI Integration**: Immediate mode GUI for debugging and configuration
- **State Management**: Flexible state system for different application modes
- **Event System**: Comprehensive event handling for input and window events
## States
The engine uses a state-based architecture with the following states:
### Menu State
- Main menu interface
- Navigation to other states
- Application exit functionality
### Config State
- Simulation configuration
- Parameter adjustment (simulation speed, particle count, gravity)
- Settings reset functionality
### Simulation State
- Real-time simulation controls
- Performance monitoring (FPS, frame time)
- Debug information display
- Time scale adjustment
## Controls
- **Key 1**: Switch to Config State
- **Key 2**: Switch to Simulation State
- **Key 3**: Switch to Main Menu
- **Mouse**: Navigate ImGUI interfaces
- **ImGUI Buttons**: State switching and configuration
## Building
The project uses Premake5 for build configuration:
```bash
# Generate Visual Studio 2022 project
premake5 vs2022
# Generate other build systems as needed
premake5 gmake2
premake5 xcode4
```
## Dependencies
- **GLFW**: Window management and input handling
- **GLAD**: OpenGL function loading
- **ImGUI**: Immediate mode GUI
- **GLM**: Mathematics library
- **Premake5**: Build system generation
## Architecture
The engine follows a modular architecture:
- **Core**: Application, Window, Event, State management
- **Platform**: Renderer API abstraction (OpenGL, Vulkan)
- **Rendering**: High-level rendering interface
- **States**: Application state implementations
## ImGUI Integration
ImGUI is fully integrated into the engine with:
- Automatic initialization after OpenGL context setup
- Per-state UI rendering through `OnImUIRender()` virtual function
- Proper frame management and cleanup
- Support for docking and viewports
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