During looking for how to build GUI elements for building a GUI for APWTCL I was experimenting with the native widgets supported on the iPhone. Very soon I found out, that there is a lot of functionality missing, when looking for Tk like widgets. That might be partially been because Apple wants to look all there GUI stuff look like they want to have it look. At that time I also found out, that there is a cut down version of OpenGL called OpenGL ES running on the iPhone (and also on Android) and as part of WebGL in javascript for browsers too.
Having a little bit of knowledge of OpenGL from the implementation of ntkwidget I wanted to give OpenGL a try, to see, what can be done using that.
For being able to support OpenGL ES for Android and IOS (iPhone) there was the need to replace the wtk part which was sending javascript stuff to the presentation part by some target independent part.