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GodotSharp.SourceGenerators

C# Source Generators for use with the Godot Game Engine

  • SceneTree class attribute:
    • Provides strongly typed access to the scene hierarchy (via _ operator)
    • Generates direct access to uniquely named nodes via class properties
    • [NEW] ISceneTree interface for use with generics (GD4 only)
      • Provides static access to TscnFilePath
    • [NEW] IInstantiable interface for use with generics (GD4 only)
      • Provides static Instantiate method
  • [NEW] Singleton class attribute (GD4 only):
    • Provides single instance access to data or scene objects
  • [NEW] AudioBus class attribute (GD4 only):
    • Provides strongly typed access to audio bus names and ids
  • [NEW] AnimNames class attribute (GD4 only):
    • Provides strongly typed access to animation names defined in .tres and .tscn files
  • [NEW] GlobalGroups class attribute (GD4 only):
    • Provides strongly typed access to global groups defined in godot.project
  • [NEW] Instantiable class attribute (GD4 only):
    • Generates configurable static method(s) to instantiate scene
  • [NEW] TR class attribute (GD4 only):
    • Provides strongly typed access to translation locales and keys (as defined in csv)
  • GodotOverride method attribute:
    • Allows use of On*, instead of virtual _* overrides
    • (Requires partial method declaration for use with Godot 4)
  • Notify property attribute:
    • Generates boiler plate code, triggering only when values differ
    • (Automagically triggers nested changes for Resource and Resource[])
  • InputMap class attribute:
    • Provides strongly typed access to input actions defined in godot.project
    • Attribute option to replace StringName with your own custom object/handler
  • LayerNames class attribute:
    • Provide strongly typed access to layer names defined in godot.project
  • Autoload class attribute:
    • Provide strongly typed access to autoload nodes defined in godot.project
  • CodeComments class attribute:
    • Provides a nested static class to access property comments from code (useful for in-game tooltips, etc)
  • OnInstantiate method attribute:
    • Generates a static Instantiate method with matching args that calls attributed method as part of the instantiation process
    • (Also generates a protected constructor to ensure proper initialisation - can be deactivated via attribute)
    • (This will be removed in favour of Instantiable in next major release)
  • OnImport method attribute (GD4 only):
    • Generates default plugin overrides and options to make plugin class cleaner (inherit from OnImportEditorPlugin)
    • (This will be removed in next major release)
  • Includes base classes/helpers to create project specific source generators
  • Version 1.x supports Godot 3 only
  • Version 2.x supports Godot 3 & 4
  • Version 3.x will support Godot 4 only
    • Notify could be improved
    • OnImport will be removed
    • SceneTree could be simplified
  • Post comments/questions/suggestions in the discussion area or raise an issue :)

Table of Contents

Installation

Install via NuGet

Attributes

SceneTree

  • Class attribute
  • Provides strongly typed access to the scene hierarchy (via _ operator)
  • Generates direct access class properties for uniquely named nodes
  • (GD4 only) Generates an interface for static tscn retrieval (ISceneTree.TscnFilePath)
  • (GD4 only) Generates an interface for static instantiation (IInstantiable.Instantiate)
  • Note that nodes are cached on first access to avoid interop overhead
  • Advanced options available as attribute arguments:
    • tscnRelativeToClassPath: (default null) Specify path to tscn relative to current class
    • traverseInstancedScenes: (default false) Include instanced scenes in the generated hierarchy
    • root: (default _) Provide alternative to _ operator (eg, to allow use of C# discard variable)
// Attach a C# script on the root node of the scene with the same name
// [SceneTree] will generate the members as the scene hierarchy and TscnFilePath property
[SceneTree]
//[SceneTree(root: "ME")]                       // Use this for alternative to `_`
//[SceneTree("my_scene.tscn")]                  // Use this if tscn has different name
//[SceneTree("../Scenes/MyScene.tscn")]         // Use relative path if tscn located elsewhere
//[SceneTree(traverseInstancedScenes: true)]    // Use this to include instanced scenes in current hierarchy
public partial class MyScene : Node
{
    public override void _Ready() 
    {
        // You can access the node via '_' object
        GD.Print(_.Node1.Node11.Node12.Node121);
        GD.Print(_.Node4.Node41.Node412);

        // You can also directly access nodes marked as having a unique name in the editor
        GD.Print(MyNodeWithUniqueName);
        GD.Print(_.Path.To.MyNodeWithUniqueName); // Long equivalent

        // Only leaf nodes are Godot types (call .Get() on branch nodes)
        // Lets say you have _.Node1.Node2, observe the following code
        GD.Print(_.Node1.Name); // invalid
        GD.Print(_.Node1.Get().Name); // valid
        Node node1 = _.Node1; // implicit conversion also possible!
        GD.Print(node1.Name); // valid
        GD.Print(_.Node1.Node2.Name); // valid
    }
}

// TscnFilePath usage:
public void NextScene()
    => GetTree().ChangeSceneToFile(MyScene.TscnFilePath);

ISceneTree (GD4 only):

  • Generated for any class decorated with [SceneTree]
namespace Godot;

public partial interface ISceneTree
{
    static abstract string TscnFilePath { get; }
}

Usage:

public void NextScene<T>() where T : ISceneTree
    => GetTree().ChangeSceneToFile(T.TscnFilePath);

IInstantiable (GD4 only):

  • Provides a default Instantiate method that uses TscnFilePath
  • Both non-generic and generic versions are available
  • A default Instantiator class is also available
public partial interface IInstantiable
{
    static T Instantiate<T>() where T : class, ISceneTree
        => GD.Load<PackedScene>(T.TscnFilePath).Instantiate<T>();
}

public partial interface IInstantiable<T> where T : class, IInstantiable<T>, ISceneTree
{
    static T Instantiate() => GD.Load<PackedScene>(T.TscnFilePath).Instantiate<T>();
}

public static partial class Instantiator
{
    public static T Instantiate<T>() where T : class, ISceneTree
        => GD.Load<PackedScene>(T.TscnFilePath).Instantiate<T>();
}

Usage:

[SceneTree]
public partial class Scene1 : Node;

[SceneTree]
public partial class Scene2 : Node, IInstantiable;

[SceneTree]
public partial class Scene3 : Node, IInstantiable<Scene3>;

*****

// Instantiator works for all ISceneTree types
var scene1 = Instantiator.Instantiate<Scene1>();
var scene2 = Instantiator.Instantiate<Scene2>();
var scene3 = Instantiator.Instantiate<Scene3>();

// The non-generic interface can also instantiate any ISceneTree type (but why would you want to)
var scene1 = IInstantiable.Instantiate<Scene1>();
var scene2 = IInstantiable.Instantiate<Scene2>();
var scene3 = IInstantiable.Instantiate<Scene3>();

// The generic interface can only instantiate it's own ISceneTree type (but why would you want to)
var scene3 = IInstantiable<Scene3>.Instantiate();

// Use generics to instantiate specific types
static T Instantiate<T>() where T : class, ISceneTree, IInstantiable
    => IInstantiable.Instantiate<T>(); // or Instantiator.Instantiate<T>();
var scene2 = Instantiate<Scene2>();

OR

static T Instantiate<T>() where T : class, ISceneTree, IInstantiable<T>
    => IInstantiable<T>.Instantiate(); // or Instantiator.Instantiate<T>();
var scene3 = Instantiate<Scene3>();

Singleton

  • Class attribute
  • Provides single instance access to data or scene objects
  • Staticly created on first use with private constructor
  • If present, invokes an Init method on instance creation
  • Advanced options available as attribute arguments:
    • init: (default 'Init') Override name of init function
[Singleton] // no tscn
public partial class MyData;

[Singleton] // no tscn, with Init function
public partial class MyNode : Node
{
    private void Init() { }
}

[Singleton(nameof(InitScene))] // with tscn (same folder, same name) and init override
public partial class MyScene : Node
{
    private void InitScene() { }
}

Generates:

partial class MyData
{
    public static MyData Instance { get; } = new();
    private MyData() { }
}

partial class MyNode
{
    public static MyNode Instance { get; } = Init(new());
    [EditorBrowsable(EditorBrowsableState.Never)] private static MyNode Init(MyNode x) { x.Init(); return x; }
    private MyNode() { }
}

partial class MyScene
{
    public static MyScene Instance { get; } = InitScene((MyScene)GD.Load<PackedScene>("res://PathTo/MyScene.tscn").Instantiate());
    [EditorBrowsable(EditorBrowsableState.Never)] private static MyScene InitScene(MyScene x) { x.InitScene(); return x; }
    private MyScene() { }
}

AudioBus

  • Class attribute
  • Provides strongly typed access to audio bus names and ids
  • Scrapes data from res://default_bus_layout.tres (or other provided path)
  • Advanced options available as attribute arguments:
    • source: (default 'default_bus_layout') relative or absolute resource path
[AudioBus]
//[AudioBus("Resources/custom_bus_layout")] // Relative to current C# file or absolute path from project root (res:// prefix or .tres extension optional)
public static partial class AudioBus;

Generates:

partial class AudioBus
{
    public const int MasterId = 0;
    public const int MusicId = 1;
    public const int FxId = 2;

    public static readonly StringName Master = "Master";
    public static readonly StringName Music = "Music";
    public static readonly StringName Fx = "FX";
}

AnimNames

  • Class attribute
  • Provides strongly typed access to animation names defined in .tres and .tscn files
  • Supports AnimationLibrary (AnimationPlayer) and SpriteFrames (AnimatedSprite) animation names
  • Supports animations saved to tres or embedded in tscn
  • Advanced options available as attribute arguments:
    • path: (default null) Provide path to tscn/tres if not same folder/same name
// MyAnims.tres (AnimLib or SpriteFrames)
//  - Anim1
//  - Anim2
// MyAnims.cs (ie, same folder, same name)

[AnimNames]
//[AnimNames("path")] // (optional path to tscn/tres)
public static partial class MyAnims;

Generates:

partial class MyAnims
{
    public static readonly StringName Anim1 = "Anim1";
    public static readonly StringName Anim2 = "Anim2";
}
// MyScene.tscn (with embedded AnimLib or SpriteFrames)
//  - Anim1
//  - Anim2
// MyScene.cs (ie, same folder, same name)

[SceneTree, AnimNames] // Anims can be defined here
public partial class MyScene : Node
{
    [AnimNames] private static partial class MyAnims; // Or nested here
}

Generates:

partial class MyScene
{
    public static readonly StringName Anim1 = "Anim1";
    public static readonly StringName Anim2 = "Anim2";

    partial class MyAnims
    {
        public static readonly StringName Anim1 = "Anim1";
        public static readonly StringName Anim2 = "Anim2";
    }
}

Instantiable

  • Class attribute
  • Generates configurable static method(s) to instantiate scene
  • Generates configurable constructor to ensure safe construction
  • Advanced options available as attribute arguments:
    • init: (default 'Init') Override name of init function
    • name: (default 'New') Override name of instantiation function
    • ctor: (default 'protected') Override scope of generated constructor (null to skip)
[Instantiate]
public partial class Scene1 : Node
{
    // No Init()
}

[Instantiate]
public partial class Scene2 : Node
{
    private void Init()
    private void Init(int arg)
}

[Instantiate(nameof(Initialise), "Instantiate", "private")]
public partial class Scene3 : Node
{
    private void Initialise(int arg1, string arg2, object arg3 = null)
}

Generates:

partial class Scene1
{
    [EditorBrowsable(EditorBrowsableState.Never)]
    private static PackedScene _Scene1 => field ??= GD.Load<PackedScene>("res://Path/To/Scene1.tscn");

    public static Scene1 New() => (Scene1)_Scene1.Instantiate();

    protected Scene1() {}
}

partial class Scene2
{
    [EditorBrowsable(EditorBrowsableState.Never)]
    private static PackedScene _Scene2 => field ??= GD.Load<PackedScene>("res://Path/To/Scene2.tscn");

    public static Scene2 New()
    {
        var scene = (Scene2)_Scene2.Instantiate();
        scene.Init();
        return scene;
    }

    public static Scene2 New(int arg)
    {
        var scene = (Scene2)_Scene2.Instantiate();
        scene.Init(arg);
        return scene;
    }

    protected Scene2() {}
}

partial class Scene3
{
    [EditorBrowsable(EditorBrowsableState.Never)]
    private static PackedScene _Scene3 => field ??= GD.Load<PackedScene>("res://Path/To/Scene3.tscn");

    public static Scene3 Instantiate(int arg1, string arg2, object arg3 = null)
    {
        var scene = (Scene3)_Scene3.Instantiate();
        scene.Initialise(arg1, arg2, arg3);
        return scene;
    }

    private Scene2() {}
}

TR

  • Class attribute
  • Provides strongly typed access to translation locales and keys (as defined in csv)
  • Advanced options available as attribute arguments:
    • source: (default 'res://Assets/tr/tr.csv') Override path to csv (relative or absolute)
    • xtras: (default true) Generate Tr* extension methods for easier formatting
keys,en,es,ja,_notes
GREET,"Hello, friend!","Hola, amigo!",こんにちは,
ASK,How are you?,Cómo está?,元気ですか,
BYE,Goodbye,Adiós,さようなら,
QUOTE,"""Hello"" said the man.","""Hola"" dijo el hombre.",「こんにちは」男は言いました,

FULL_NAME,My full name is {0} {1},Mi nombre completo es {0} {1},私のフルネームは{0} {1}です。,Example with 2 args
DATE_OF_BIRTH,My date of birth is {0:yyyy-MM-dd},Mi fecha de nacimiento es {0:yyyy-MM-dd},私の生年月日は{0:yyyy-MM-dd}です。,Example with 1 arg

With:

[TR]
//[TR(xtras: false)] // (optional flag to skip Tr* extension methods)
//[TR("Assets/tr.csv")] // (optional path to csv, relative to current C# file or absolute path from project root (res:// prefix & .csv extension are optional))
public static partial class TR;

Generates:

partial class TR
{
    public static partial class Loc
    {
        public const string En = "en";
        public const string Es = "es";
        public const string Ja = "ja";

        public static readonly string[] All = [En, Es, Ja];
    }

    public static partial class Key
    {
        public static readonly StringName Greet = "GREET";
        public static readonly StringName Ask = "ASK";
        public static readonly StringName Bye = "BYE";
        public static readonly StringName Quote = "QUOTE";
        public static readonly StringName FullName = "FULL_NAME";
        public static readonly StringName DateOfBirth = "DATE_OF_BIRTH";

        public static readonly string[] All = [Greet, Ask, Bye, Quote, FullName, DateOfBirth];
    }
}

static partial class TRExtensions
{
    public static string TrGreet(this GodotObject self) => self.Tr(TR.Key.Greet);
    public static string TrAsk(this GodotObject self) => self.Tr(TR.Key.Ask);
    public static string TrBye(this GodotObject self) => self.Tr(TR.Key.Bye);
    public static string TrQuote(this GodotObject self) => self.Tr(TR.Key.Quote);
    public static string TrFullName(this GodotObject self, object arg0, object arg1) => string.Format(self.Tr(TR.Key.FullName), arg0, arg1);
    public static string TrDateOfBirth(this GodotObject self, object arg0) => string.Format(self.Tr(TR.Key.DateOfBirth), arg0);
}

Usage:

TranslationServer.SetLocale(TR.Loc.Es);

GD.Print(this.TrGreet()); // Hola, amigo!
GD.Print(this.Tr(TR.Key.Greet)); // Hola, amigo!

GD.Print(this.TrFullName("Cat", "Lips")); // Mi nombre completo es Cat Lips

GlobalGroups

  • Class attribute
  • Provides strongly typed access to global groups defined in godot.project
# (project.godot)

[global_group]

Group1="Test Group"
Group2="Test Group"
[GlobalGroups]
public static partial class GRP;

Generates:

partial class GRP
{
    public static readonly StringName Group1 = "Group1";
    public static readonly StringName Group2 = "Group2";
}

Alternatively,

[SceneTree]
public partial class MyScene : Node
{
    [GlobalGroups] private static partial class GRP;
}

Generates:

partial class MyScene
{
    partial class GRP
    {
        public static readonly StringName Group1 = "Group1";
        public static readonly StringName Group2 = "Group2";
    }
}

GodotOverride

  • Method attribute
  • Allows use of On*, instead of virtual _* overrides
  • (Requires partial method declaration for use with Godot 4)
  • Advanced options available as attribute arguments:
    • replace: (default false) Skip base call generation (ie, override will replace base)
public partial class MyNode : Node2D
{
    [GodotOverride]
    protected virtual void OnReady()
        => GD.Print("Ready");

    [GodotOverride(replace: true)]
    private void OnProcess(double delta)
        => GD.Print("Processing");

    // Requires partial method declaration for use with Godot 4
    public override partial void _Ready(); 
    public override partial void _Process(double delta); 
}

Generates:

    public override void _Ready()
    {
        base._Ready();
        OnReady();
    }

    public override _Process(double delta)
        => OnProcess(delta);

Notify

  • Property attribute
  • Generates public events ValueChanged & ValueChanging
    • (Automagically triggers nested changes for Resource and Resource[])
  • Events are triggered only if value is different
  • Initial value can be set without triggering event
public partial class NotifyTest : Node
{
    // Recommended usage: Partial properties were introduced in C# 13
    [Notify] public partial int Value { get; set; }

    // Original usage
    [Notify] public float Value1 { get => _value1.Get(); set => _value1.Set(value); }

    // Original usage with private changed event handler
    [Notify] public float Value2 { get => _value2.Get(); set => _value2.Set(value, OnValue2Changed); }
    private void OnValue2Changed() { GD.Print("Value2 has changed"); }

    // Incorrect usage: Must use partial or implement get/set as above
    [Notify] public int Value3 { get; set; }

    public NotifyTest()
    {
        // Optional: Set default values in constructor
        InitValue(7); // Set initial value without triggering events
        Value = 7; // Or set directly to trigger events
    }

    public override void _Ready()
    {
        ValueChanging += () => GD.Print($"Value is about to change from {Value}");
        ValueChanged += () => GD.Print($"Value has been changed to {Value}");

        // You can also subscribe to private events if needed
        // These will always be called before public facing events
        // This might be useful if you need to reset public listeners
        //_value.Changing += OnValueChanging;
        //_value.Changed += OnValueChanged;

        Value = 1; // Raises changing/changed events
        Value = 2; // Raises changing/changed events
        Value = 2; // No events are raised since value is the same
    }
}

InputMap

  • Class attribute
  • Provides strongly typed access to input actions defined in godot.project (set via editor)
  • If you want access to built-in actions, see BuiltinInputActions.cs
  • Advanced options available as attribute arguments:
    • dataType: (default StringName)
[InputMap]
public static partial class MyInput;

[InputMap(nameof(GameInput))]
public static partial class MyGameInput;

// Example custom input action class
public class GameInput(StringName action)
{
    public StringName Action => action;

    public bool IsPressed => Input.IsActionPressed(action);
    public bool IsJustPressed => Input.IsActionJustPressed(action);
    public bool IsJustReleased => Input.IsActionJustReleased(action);
    public float Strength => Input.GetActionStrength(action);

    public void Press() => Input.ActionPress(action);
    public void Release() => Input.ActionRelease(action);
}

Equivalent (for defined input actions) to:

// (static optional)
// (string rather than StringName for Godot 3)
// (does not provide access to built-in actions)
partial static class MyInput
{
    public static readonly StringName MoveLeft = new("move_left");
    public static readonly StringName MoveRight = new("move_right");
    public static readonly StringName MoveUp = new("move_up");
    public static readonly StringName MoveDown = new("move_down");
}

partial static class MyGameInput
{
    public static readonly GameInput MoveLeft = new("move_left");
    public static readonly GameInput MoveRight = new("move_right");
    public static readonly GameInput MoveUp = new("move_up");
    public static readonly GameInput MoveDown = new("move_down");
}

LayerNames

  • Class attribute
  • Provides strongly typed access to layer names defined in godot.project (set via editor)
  • WARNING: In Godot 3 all layer helper functions start from 0 instead of 1:
    • Camera3D.GetCullMaskBit(x - 1)
    • VisualInstance.GetLayerMaskBit(x - 1)
    • CollisionObject.GetCollisionMaskBit(x - 1)
    • CollisionObject.GetCollisionLayerBit(x - 1)
    • CollisionObject2D.GetCollisionMaskBit(x - 1)
    • CollisionObject2D.GetCollisionLayerBit(x - 1)
  • In Godot 4 this only applies to visibility/cull layer functions (which are also uint):
    • Camera3D.GetCanvasCullMaskBit((uint)x - 1)
    • VisualInstance.GetVisibilityLayerBit((uint)x - 1)
[LayerNames]
public static partial class MyLayers;

Equivalent (for defined layers) to:

// (static optional)
public static partial class MyLayers
{
    public static class Render2D
    {
        public const int MyLayer1 = 1;
        public const int MyLayer2 = 2;
        public const int MyLayer7 = 7;
        public const int _11reyaLyM = 11; // prefixed with underscore if required

        public static class Mask
        {
            public const uint MyLayer1 = 1u << 0;
            public const uint MyLayer2 = 1u << 1;
            public const uint MyLayer7 = 1u << 6;
            public const uint _11reyaLyM = 1u << 10;
        }
    }

    // Repeat for Render3D, Physics2D, Physics3D, Navigation2D, Navigation3D, Avoidance
}

Autoload

  • Autoload is a generated class (ie, not attribute) in Godot namespace
    • Provides strongly typed access to autoload nodes defined in editor project settings
    • Supports tscn nodes & gd/cs scripts with C# compatible types inferred wherever possible
  • AutoloadRename is an additional attribute that can be used to provide C# friendly names eg, for the following autoloads (defined in project.godot):
[autoload]

gd_utils="*res://addons/handy_utils/gd_utils.gd"
cs_utils="*res://addons/silly_sausage/MyUtils.cs"
DebugMenu="*res://addons/debug_menu/debug_menu.tscn"

With the following renames (optionally defined in your project):

namespace Godot;

[AutoloadRename("UtilsGD", "gd_utils")]
[AutoloadRename("UtilsCS", "cs_utils")]
static partial class Autoload;

The following class is generated:

namespace Godot;

static partial class Autoload
{
    private static Node root = (Engine.GetMainLoop() as SceneTree)?.Root;

    /// <summary>Autoload: gd_utils</summary>
    public static Node UtilsGD => field ??= root?.GetNodeOrNull<Node>("gd_utils");

    /// <summary>Autoload: cs_utils</summary>
    public static MyUtils UtilsCS => field ??= root?.GetNodeOrNull<MyUtils>("cs_utils");

    /// <summary>Autoload: DebugMenu</summary>
    public static CanvasLayer DebugMenu => field ??= root?.GetNodeOrNull<CanvasLayer>("DebugMenu");
}

CodeComments

  • Class attribute
  • Provides a nested static class to access property comments from code
  • Advanced options available as attribute arguments:
    • strip: (default "// ") The characters to remove from the start of each line
[CodeComments]
public partial class CodeCommentsTest : Node
{
    // This a comment for Value1
    // [CodeComments] only works with Property
    [Export] public float Value1 { get; set; }

    // Value 2 is a field so no comment
    [Export] public float value2;

    public override void _Ready() 
    {
        GD.Print(GetComment(nameof(Value1))); // output: "This a comment for Value1\n[CodeComments] only works with Property"
        GD.Print(GetComment(nameof(value2))); // output: "" (No output for fields, but could be added if needed)
    }
}

OnInstantiate

  • Method attribute
  • Generates a static Instantiate method with matching args that calls attributed method as part of the instantiation process
  • (Also generates a protected constructor to ensure proper initialisation - can be deactivated via attribute)
  • Advanced options available as attribute arguments:
    • ctor: (default "protected") Scope of generated constructor (null, "" or "none" to skip)
// Initialise can be public or protected if required; args also optional
// Currently assumes tscn is in same folder with same name
public partial class MyScene : Node
{
    [OnInstantiate]
    private void Initialise(string myArg1, int myArg2)
        => GD.PrintS("Init", myArg1, myArg2);
}

Generates:

partial class MyScene
{
    [EditorBrowsable(EditorBrowsableState.Never)]
    private static PackedScene _MyScene => field ??= GD.Load<PackedScene>("res://Path/To/MyScene.tscn");

    public static MyScene Instantiate(string myArg1, int myArg2)
    {
        var scene = (MyScene)_MyScene.Instantiate();
        scene.Initialise(myArg1, myArg2);
        return scene;
    }

    protected MyScene() {}
}

Usage:

    AddChild(MyScene.Instantiate("str", 3));

OnImport

  • Method attribute (GD4 only)
  • Generates default plugin overrides and options to make plugin class cleaner (inherit from OnImportEditorPlugin)
  • DEPRECATED - (Not that useful unless writing lots of plugins - will be removed in v3)

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C# source generators for the Godot Game Engine

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