I've attempted to use this however when I use it with glCopyTexImage2D I get no texture.
That make sence as I've notice that glCopyTexImage2D gets no pointer to my data.
How does this all work? Do I need to load the texture in first with glTexImage2D then call glCopyTexImage2D ?
I've tried a few combinations but can't seem to work out how this is meant to be operated.