C# GDExtension Bindgen

Automatic C# bindings generator for GDExtension classes (Godot 4.4+)

How to use

1. Import your GDExtensions
2. Enable the C# GDExtension Bindgen plugin in Project Settings... -> Plugins tab
3. Click in the menu item Project -> Tools -> Generate C# GDExtension Bindings whenever you want to regenerate C# bindings
4. Enjoy 🍾

How does it work?

This editor plugin contains the script csharp_gdextension_bindgen.gd with the whole C# code generation.
It uses the reflection provided by ClassDB to generate bindings to enums, constants, properties, methods and signals for all classes registered using the GDExtension API.

The generated C# classes are in the GDExtensionBindgen namespace, so you'll need to add using GDExtensionBindgen; before using them.

The generated classes do not inherit from any GodotObject subclass because they are not C# scripts attached to the native objects, but rather a thin C# wrapper with strongly typed definitions of all members registered. Most of the time this addon tries to generate code that matches what Godot generates for C# for engine classes, e.g. you'll see StringNames cached using the PropertyName, MethodName and SignalName nested classes.

Caveats

• Since generated classes do not inherit GodotObject, there's no easy way to create C# scripts that specify the wrapped GDExtension classes as their base class

Generating bindings from the CLI

This addon also contains the cli_entrypoint.gd script that can be used to generate bindings via command line:

# Generates C# bindings for all GDExtension classes
# Optionally pass the desired output directory and C# namespace
godot --headless --script addons/csharp_gdextension_bindgen/cli_entrypoint.gd -- [OUTPUT_DIR] [NAMESPACE]

This can be used by GDExtension projects themselves as a way to distribute pre-generated C# bindings.

TODO

• support constant integers that are not part of any enum
• get/set properties inherited from engine class directly without Get/Set
• support signals
• submit to the Asset Library
• cache StringNames
• support packed arrays as method default values
• support non-empty Arrays and Dictionaries as method default values