Haxe/C# externs for Godot 3.4

Use the Godot engine with Haxe scripting, using the Haxe/C# target.

Using the editor plugin plugin is recommended, see the documentation on how to install it, setup a project, using Haxe scripts and building your project.

Godot will show many warnings about the Haxe generated C# code, this is because of https://github.com/godotengine/godot/issues/28293.

Differences with the C# API

• Casing
• Variables and functions use the camelCase formating instead of C#'s PascalCase
• Enums and types still use PascalCase
• Constants use ALL_CAPS
• Due to Haxe's module handling C# subtypes like Godot.Animation.InterpolationType are godot.Animation_InterpolationType
• Export meta for variables is @:export, C# is [Export]
• Tool meta for classes is @:tool, C# is [Tool]
• Haxe has different keywords than C#, if the C# API use an Haxe keyword it'll be suffixed with a _
• Typesafe signals with lambda support, for improved safety and dce support
• signal_name become a onSignalName variable of type Signal with connect/disconnect/isConnected functions
• Replace mynode.connect("the_signal", myHandler, "myFunction") with mynode.onTheSignal.connect(myHandler.myFunction)
• This prevent typos on signal name, function name, and mismatch signature on the connected function or on the emitSignal function
• Define your own signals with CustomSignal<FunctionType> and use it with the same api as the built-in signals
• Typesafe actions
• The project.godot file is read for its input action list and used to populate the godot.Action enum
• You can pass an Action to functions like Input.isActionPressed eg Input.isActionPressed(MoveLeft) instead of Input.isActionPressed("MoveLeft")
• This prevents typos on actions and give you autocompletion of the actions
• Note: the patched functions still accept strings as normal
• The as operator is a function on godot object, if using godot.Utils
• Similar to GDScript you can delay a variable initialization until the node is ready by using @:onready var myNode = getNode("Path/To/Node).as(Spatial);, and myNode will only call getNode once _Ready is called

TODOs

• Mark deprecated functions
• Array access on Vector2, Vector3, Transform, Transform2D, Quat, Color and Basis
• Missing types Godot.DynamicGodotObject and Godot.MarshalUtils
• Explicit constructors
• Function with type parameters on PackedScene.Instance, PackedScene.InstanceOrNull
• cs.system.EventHandler_1 on GD.UnhandledException

License

The generated externs and support code are MIT licensed, the original C# externs and the Godot engine are MIT licensed.