Repository for GameMaker's Extension Generator tool.
Schema-driven code generator for GameMaker native extensions
extgen is a code generation tool that produces GML bindings, native platform glue, and CMake build systems for GameMaker extensions from a single schema-based input.
It is designed to be:
- ✅ Target-driven (platforms decide what gets generated)
- ✅ Deterministic & repeatable
- ✅ Schema-validated
- ✅ Extensible and contributor-friendly
From one GMIDL input file, extgen can generate:
- GameMaker GML bindings
- C++ native glue code
- Android (Java / Kotlin / JNI)
- iOS & tvOS (ObjC / Swift / Native)
- Consoles (Xbox, PS4, PS5, Switch)
- Complete CMake projects & presets
- Optional documentation output
All behavior is controlled via a JSON config file validated by an automatically generated JSON Schema.
# Initialize a new project
extgen --init ./my-extension
# Generate everything
extgen --config ./my-extension/config.jsonAll documentation lives in the GitHub Wiki:
- User Manual — configuration, targets, workflows
- Build Guide — how to build extgen from source
- Developer Docs — architecture, emitters, contribution guide
👉 Start here:
Wiki → Home
- .NET 9 SDK
- Windows, macOS, or Linux
- Actively developed
- Production-ready core
- Open to contributions
Contributions are welcome!
If you want to add:
- new targets
- new emitters
- improvements or fixes
Please read the Developer Documentation in the wiki before submitting a PR.
See LICENSE for details.
