Sharing texture between OpenGL contexts

Hi,

Here we are doing some 'off screen' rendering (Under Windows) and so we are rendering into a 'bitmap'.

The problem is that we create a new gl-context, then render to the bitmap but it sounds that the textures are not shared.

"Bitmap rendering" is not hardware accelerated !

A solution will be to use PBO, render into it etc... but in some cases PBO are not supported !

So, I would like to find a way to share the textures from the initial GL context to the new one. Do you know a way of doing this ?

Thanks