// not be in the right context, so don't delete it right away;
// the cleanup in release_fbo() (which calls cleanup_unlinked_fbos())
// will take care of actually doing that later.
// not be in the right context, so don't delete it right away;
// the cleanup in release_fbo() (which calls cleanup_unlinked_fbos())
// will take care of actually doing that later.