Recently updated my imgui integration for BGE, so I thought I’d make a post here.
Dear Imgui is a fully-featured UI system built on the IMGUI paradigm - which basically means the UI is updated every frame using a really simple API. (Now this doesn’t mean it’s slow, because it actually doesn’t do immediate-mode rendering, instead it generates a fast vertex buffer for the GPU to render).
Anyways, I didn’t want to have to write a whole UI library from scratch, and imgui is pretty cool, so I decided to just cram imgui into upbge! can’t be too difficult, right? 
Turned out to be a lot of PyOpenGL wackiness, but I eventually got it working.
Features
Credit to the
imgui_bundlelibrary here for the amazing python bindings and example opengl integrations. Also originally used the pyimgui library for rendering and initial integration. And of course, credit to the original Dear Imgui library by ocornut here
- Full windowing system
- Docking support
- Viewports in 3D using textures as well as main 2D UI
- Wrapper classes to easily use the library with
bge
This is a mainly python-based library, so to make UI you will need to know some basic python.
Some videos
