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Cross-Platform Interface for Modern Graphics APIs (Vulkan, DirectX 12, Metal)

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# OpenRHI

**OpenRHI** — *orhi* — is a lightweight, permissive, and cross-platform **Render Hardware Interface** for modern graphics APIs, built with C++20.

Write hardware-agnostic graphics code once, and run it seamlessly across multiple platforms and graphics APIs.

> [!important]
> _OpenRHI_ is a collaborative, open-source project, and we’re **actively looking for contributors**! The Vulkan backend is partially implemented, and the DirectX 12 backend is in progress (see this [pull request](https://github.com/adriengivry/orhi/pull/24) for more info). Whether you’re experienced in graphics programming or just eager to learn, your contributions can help _OpenRHI_ become a modern open-source reference for rendering. Join us and make an impact!

**OpenRHI** is...
- 🧩 **Simple:** Easy to understand and extend
- ⚡ **Fast:** Minimal runtime overhead with template-based design
- ⛓️‍💥 **Standalone:** Zero external dependencies
- 📃 **Documented:** Comprehensive source code documentation
- 🌈 **Cross-platform:** Native support for Windows, macOS, and Linux
- ⚙️ **Build-ready:** Quick setup with [CMake](https://cmake.org/)

**Goals:**
- Provide a thin, explicit abstraction over modern graphics APIs
- Offer low-level access to each backend through a unified interface
- Maintain explicitness: no hidden logic or implicit behavior
- Ensure minimal runtime overhead with zero-cost abstractions
- Remain cross-platform and hardware-agnostic
- Maintain minimal external dependencies

**Non-Goals:**
- Hiding platform or API-specific implementation details
- Acting as a high-level rendering engine or framework
- Abstracting away or simplifying modern graphics concepts
- Automatically managing resources, pipelines, or synchronization

## Supported Graphics APIs

**OpenRHI** primarily targets **desktop platforms**, with an [API](include/orhi/api/) architecture designed for maximum flexibility to support any backend your application needs.

**Target platforms:** Windows (🪟), Linux (🐧), and macOS (🍎)

> [!WARNING]
> **OpenRHI** is actively evolving as support for additional graphics backends is added. The [API](include/orhi/api/) may change to accommodate the unique requirements and design philosophies of each backend. Implementation details are also subject to refinement as the project works toward production-quality standards.

> [!NOTE]
> **OpenRHI** currently builds only as a static library.

## Multi-Backend Architecture
**OpenRHI** supports compiling with multiple graphics APIs simultaneously.

You can also choose which graphics API serves as the default backend for API-agnostic objects, while still having access to backend-specific implementations when needed.

### Using the Default Graphics API
```cpp
#include <orhi/Buffer.h>

orhi::Buffer buffer{};
```

### Using Specific Graphics APIs
```cpp
#include <orhi/impl/vk/Buffer.h>
#include <orhi/impl/mock/Buffer.h>

orhi::impl::vk::Buffer vulkanBuffer{};
orhi::impl::mock::Buffer mockBuffer{};
```

## Examples
**OpenRHI** comes with a set of [examples](examples/) for you to try.

> [!IMPORTANT]
> Example projects depend on [glfw](https://github.com/glfw/glfw), [glm](https://github.com/g-truc/glm), and [stb](https://github.com/nothings/stb), which are included as Git submodules. Make sure to initialize submodules before generating projects.

**Windows:**
```powershell
git clone https://github.com/adriengivry/orhi --recurse-submodules
cd .\orhi
.\gen_proj_win32.bat
.\build\orhi.sln # (optional) open solution in Visual Studio
```

**Linux:**
```powershell
git clone https://github.com/adriengivry/orhi --recurse-submodules
cd ./orhi
./gen_proj_linux.sh
```

## Contributing
All contributions to **OpenRHI** are welcome — from bug reports and feature suggestions to code improvements and documentation enhancements.

Feel free to open issues or submit pull requests for review. Every contribution helps make **OpenRHI** better!

For more information on contributing, check out [CONTRIBUTING.md](CONTRIBUTING.md).

*By contributing, you agree that your contributions will be licensed under the [MIT License](LICENSE).*

## License
**OpenRHI** is licensed under the [MIT License](LICENSE).

You are free to use, modify, and distribute this project with proper attribution. See the license file for more details.

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