$ show flibitijibibo/SDL3-CS
This repository provides C# bindings for the SDL3 multimedia library through automated code generation. It processes SDL3 C headers via the c2ffi tool to produce an intermediate JSON representation, then applies user-provided overrides to generate idiomatic C# P/Invoke wrappers. The output includes two variants: SDL3.Legacy.cs targeting .NET Framework using DllImport with manual string marshaling, and SDL3.Core.cs targeting .NET 8+ using LibraryImport with custom marshallers for improved safety and performance. The bindings enable .NET applications to access SDL3's graphics, audio, input, GPU, and system functionality. While the generator is highly specialized for SDL3, it demonstrates sophisticated patterns in type resolution, struct layout handling, and marshaling strategy selection that could inform similar binding projects.
The LLM identified 2 files worth highlighting for reuse:
The SDLBool struct provides a reusable pattern for marshaling C's _Bool type (typically a byte) to C# bool. It features implicit conversions in both directions and is completely self-contained with no SDL3-specific dependencies. This component solves a common interop challenge and can be extracted for use in any C# binding needing to handle C boolean types.
The custom string marshallers (SDLOwnedStringMarshaller and CallerOwnedStringMarshaller) with UTF8 encoding/decoding helpers demonstrate a reusable pattern for handling native string ownership semantics. SDLOwnedStringMarshaller automatically frees SDL-allocated strings, while CallerOwnedStringMarshaller requires explicit freeing by the caller. This pattern safely manages cross-language memory boundaries and can be adapted for other native libraries with similar string ownership models.