Game GUI is a skin-able GL based Widget Class for Games
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LICENSE MIT Jul 20, 2015 Update Jul 27, 2015

Game GUI - A Simple GUI with skin-support for OpenGL Games

License : MIT


After trying several gui's more or less suited for games (LibRocket, Qt, NVWidgets, CEgui, etc), I found that none of them was really light weight, easy to use and fully skinable at the same time. This was the reason I started to write my own GUI / C++. The project was completed in about one month.



  • Advanced skin scaling: define how the inner and borders of a texture shall be scaled ( simple scale, repeating inner pattern or constant outer frame )
  • UTF8 Support
  • TTF Support
  • Easy skinning support
  • Alpha support (RGBA), so you can have transparent windows/widgets etc
  • direct access to all controls and their members
  • Non-blocking visualization
  • Callback support
  • No need to mess with inheritance and virtual functions
  • Different from most GUIs, Widgets and windows are stored completely inside the GUI, so no need to define any window or widget variables in your code.
  • Directory: Controls are stored and accessed by a tree structure that is rendered every time like a scene graph
  • No event loop, show function or update function
  • No need to have a timer that calls an update function
  • Lightweight: Only Depends on GL and libFreetype and DevIL
  • Can easily be used in SDL, Qt and other environments. Just plug in the keyboard and mouse events and call the gui's draw function from your main render loop.
  • Config file support for default variables (font,padding etc) and skin textures+scaling parameters
  • Only 2000 lines of code for the entire Gui class including all widgets. Therefore easy to modify and extend.
  • Comes with a simple file-browser (See screenshot1)
  • MIT license
  • Multi-screen support (same as multiple Desktops). You can have a title screen, loading screen, ingame screen etc. Simply create them at the beginning and the switch between by setting gui.active_screen=number;
  • Window manager
  • Context menu
  • Custom mouse pointer
  • Widget Classes : Window, Menu, Label, Button, CheckBox, Tab, Combo, Textedit, Radio
  • Controls have support for custom user variables like control.var.string["myvar"]="hello"

Most important is the access by the directory structure and using simple assigns '=' to create a new instance of a widget or window.

The usage is basically as follows:

Create (and instantly show) a window:


Adding a button :

gui.window["id1"].button["load"] = Gui::Button("Load",20,20,50,30); 

Adding a simple callback

    [](Gui::Window *window,Gui::Button* control,int index)

Setting a custom skin:


Also you have direct access to a skin's texture to use it as output of a FBO e.g. The 3D viewer of the screenshot below uses that.


Duplicating a window is easy: The duplicate is instantaneously visible (works also for controls)

gui.window["id2"] = gui.window["id1"]

The GUI is not fully optimized, yet you have like 700 fps with 20 simple windows on the screen on a notebook PC. Controls are stored in a std vector as share ptr. For rendering, it is not necessary to evaluate the string keys.

Mathlib included from

(C) by Sven Forstmann in 2015