Re: [GtkGLExt] Opengl rendering on image background

["Timothy M. Shead" <tshead k-3d com>]

Jerry Stahl wrote:

> I am new at using GtkGLExt/OpenGL and was wondering if
> anyone knows if you can render OpenGL on top of a
> static background image, such as a .png, jpg, etc.  I
> have an application where I need to create a gui
> containing a image background (a drawing) that will,
> at times, have graphical objects moving over the top
> of it.  I was hoping that I could use OpenGL to do the
> object rendering over the image background.  Any help
> or suggestions would be greatly appreciated.

You will likely want to draw everything, including the background image, 
using OpenGL.  The alternative would be to draw to a pixmap using 
OpenGL, then composite the results over the background yourself, but 
this would almost certainly be slower and more complex.

Cheers,
Tim