Using OpenGL to make GUI

[yj1214]

Instead of using libraries like Qt, wxWidgets, GTK+ etc. is it a good idea to make GUI using only pure OpenGL?

Let's say I made a GUI program with pure OpenGL. Would my program work fine with every computer? I heard that in some cases, OpenGL doesn't insure identical pixel output on some computers. Is this true?

[Smac89]

See the answer here:
http://stackoverflow.com/questions/14007802/is-opengl-cross-platform-if-not-how-a-game-be-ported

Also see:
https://en.wikipedia.org/wiki/List_of_widget_toolkits#Based_on_OpenGL

[TwilightSpectre]

Something that should be mentioned is that writing a UI library from scratch is rather difficult, and generally unnecessary, so you would generally use one of the libraries @Smac89 linked.

In addition, as an example of a program which I'm pretty sure exclusively uses OpenGL for UI is Blender.