👉 GnollHack is an ambitious open-source project that bridges the gap between decades-old legacy C code and modern cross-platform development paradigms, serving as a rare and powerful showcase of .NET MAUI's capabilities in game development.
Engineering Achievements
GnollHack is not just another application; it is a profound technical achievement that demonstrates the true power and flexibility of modern .NET. For CTOs, technical leads, and senior developers looking to understand the limits of cross-platform UI frameworks, GnollHack stands as a testament to what is possible when legacy architecture meets state-of-the-art tooling.
- Legacy Modernization at Scale: We have successfully integrated NetHack's sprawling, multi-decade C codebase into a modern C#/.NET environment. This proves that vast legacy systems can be preserved, modernized, and distributed across contemporary platforms without rewriting the core business logic from scratch.
- .NET MAUI as a Game Engine: While .NET MAUI is traditionally seen as a framework for business apps, GnollHack pushes it to the edge. We utilize .NET MAUI to drive a complex, highly-interactive 2D game, proving its viability for high-performance, non-standard UI requirements.
- Advanced Cross-Platform Architecture: From a single unified .NET codebase and native bridge, GnollHack seamlessly targets Android, iOS, Windows, and macOS. This represents a massive reduction in platform-specific technical debt and maintenance overhead.
- High-Performance Multi-Threading: To maintain high frame rates while executing complex game logic, GnollHack implements a sophisticated multi-threaded architecture. The native C game loop is completely decoupled from the MAUI UI and the hardware-accelerated Skia rendering threads, showcasing advanced synchronization and thread-safety patterns in .NET.
- Ecosystem Integration: By integrating SkiaSharp for GPU-accelerated 2D rendering and FMOD for professional-grade audio middleware, GnollHack exemplifies how smoothly .NET MAUI can orchestrate industry-standard native libraries to deliver a rich multimedia experience.
Technologies Behind GnollHack
UI Framework: .NET MAUI
(Originally Xamarin.Forms)
- https://github.com/dotnet/maui
GnollHack is one of the very few games developed with .NET MAUI, which is primarily a cross-platform app creation framework. GnollHack extends the boundaries of .NET MAUI by implementing a fully fledged 2D game. .NET MAUI allows GnollHack to run on Android, iOS, Windows, and macOS.
.NET MAUI allows us to quickly and effectively develop a complex UI for GnollHack, using a multitude of premade controls, such as text entries, multiline text boxes, in-game web views, and dynamically sizing layouts.
Graphics Drawing Engine: SkiaSharp
- https://github.com/mono/SkiaSharp
- https://skia.org/
GnollHack utilizes the highly effective SkiaSharp, which is built upon Google's Skia graphics drawing engine, to draw its graphics in a fast and battery-efficient way. SkiaSharp offers a developer-friendly API to draw bitmaps, shapes, and text on a canvas, which can be GPU accelerated.
Sound Middleware: FMOD
- https://www.fmod.com/
GnollHack integrates FMOD — a commercial cross-platform audio library — on all platforms as sound middleware, which is a major technological advancement, exemplifying that FMOD can be integrated with .NET MAUI for playing sounds and music.
Native C Code Integration
GnollHack integrates a native C library based on NetHack's source code into modern frameworks. This native C library integration works on all supported platforms.
Multi-Threaded
GnollHack runs on two or three threads depending on the operating system. This allows GnollHack to run at high performance but requires us to implement several thread-safety features.