Knob (GUI) with openGL


I would like to create GUI for a VST Plugin.
I don’t want use any framework, only openGL.

This is an example of the type of knobs I would like obtain:

I also want apply some effects (lights, shadow etc…),
On this video (at 8:30), an another example of rendering:

I’m not sure but I think I have different ways to do that, but I don’t know what is the best choice:

  • rotate images with superposed mask / images
  • import .obj file from 3dsmax et rotate
  • 2D sprite

Do you have an idea ?