Re: [GtkGLExt] Opengl rendering on image background

[jlm <jsado_sc3 earthlink net>]

The way to do this in OpenGL is to load the background as a texturemap, 
map it to a rectangle, and the first thing you draw is that rectangle. I 
have to do this same thing, and I believe this is the only way.

I saw some documentation about an auxiliary buffer, but it turns out 
that most gfx cards do not implement this buffer (the idea being to load 
that buffer with your image data, and on each frame copy it to your back 
buffer).

Jerry Stahl wrote:
> Hi,
>
> 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.
>
> J. Stahl 
>
>
> 	
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