Dear ImGui plugin for Godot 4 (C#)

Dear ImGui is a popular library for rapidly building tools for debugging and development. This plugin, with the aid of ImGui.NET, allows you to use ImGui in Godot with C#.

After installing the plugin, usage is as simple as this:

public partial class MyNode : Node
{
    public override void _Process(double delta)
    {
        ImGui.Begin("ImGui on Godot 4");
        ImGui.Text("hello world");
        ImGui.End();
    }
}

Getting Started

imgui-godot requires Godot 4.0.beta5 or later, running on a 64-bit platform.

Demo

Click Build in the top right, then run the project.

On macOS, you will need to do something like:

cp .godot/mono/temp/bin/Debug/runtimes/osx-universal/native/libcimgui.dylib .

Your project

1. Create a project and, if you haven't already added some C# code, use Project > Tools > C# > Create C# solution.

2. Install the plugin by copying over the addons folder.

3. In Visual Studio or another IDE, open the solution and allow unsafe code, and install ImGui.NET with NuGet. Save and return to Godot.

   (If you prefer to manually edit the .csproj instead, refer to the demo csproj for the necessary modifications, or copy it entirely.)

4. Back in the Godot editor, click Build.

5. Enable the plugin in Project > Project Settings > Plugins.

6. Write code!

Usage

In any Node's _Process method, use ImGuiNET to create your GUI. Just don't set the ProcessPriority in any of your Nodes to either int.MinValue or int.MaxValue.

You can also connect to the ImGuiLayout signal, and use ImGui in the method which handles that signal:

ImGuiLayer.Connect(OnImGuiLayout);

ImGuiLayer

If you want to customize fonts or other settings, open the scene res://addons/imgui-godot/ImGuiLayer.tscn

Use the Font and FontSize properties to add custom fonts. Use the Visible property to show/hide the GUI as needed (when not visible, it uses almost zero resources). Change the Layer if you need to render anything on top of the GUI.

Widgets

These methods should only be called within _Process or an ImGuiLayout callback.

Image and ImageButton are simple wrappers for your convenience.

SubViewport displays an interactive viewport which receives input events. Be sure to change your SubViewport's Update Mode to Always.

ImGuiGD

This is the rest of the public API. You typically won't need to call any of these methods directly.

That's about it. Everything else is provided by ImGui itself, via ImGui.NET.

Credits

Code written by Patrick Dawson and contributors, released under the MIT license

Godot Logo (C) Andrea Calabró, distributed under the terms of the Creative Commons Attribution 4.0 International License (CC-BY-4.0 International) https://creativecommons.org/licenses/by/4.0/

Hack font distributed under the MIT license

M PLUS 2 font licensed under the SIL Open Font License, Version 1.1.

This plugin's functionality relies heavily on ImGui.NET by Eric Mellino