Wrong forum mate
I'm no OpenGL expert, but from what I've read, offscreen rendering is just that: offscreen rendering. This means drawing pixels to an area that cannot be viewed by the player at all, such as a pbuffer (pixel buffer?), but are still rendered directly to the videocard's memory. Obvious advantages are that texture copying can be done within video memory instead of hauling it around system memory -> CPU (especially if your videocard has the render-to-texture extension), but now you have to be responsible for managing your videocard's memory.
[EDIT]: This is the JO
AL (OpenAL) forum.
