It comes from BRL.GLGraphics. It is just a module which creates/handles an OpenGL context.
Currently, OpenGL 1.1 is used. So I don't know how you would go about doing that.
To use OpenGL in a canvas call,
at the beginning of your program.
Then when you go to render call,
After that, you can use OpenGL like you normally would.
Currently, OpenGL 1.1 is used. So I don't know how you would go about doing that.
To use OpenGL in a canvas call,
SetGraphicsDriver GLGraphicsDriver()
at the beginning of your program.
Then when you go to render call,
SetGraphics CanvasGraphics(canvas)
After that, you can use OpenGL like you normally would.