> Mmm, but here, the depth has no influence on the non-linear framebuffer, > it doesn't really is a non-linear framebuffer, just a framebuffer where > not all the memory is directly available ? It still has a linear > addressing space ? Or maybe i am just misunderstanding things ? Linear from what viewpoint - it may also be tiled too. Quite a few cards also support multiple surfaces and things like keeping your windows in AGP space then using them as textures for compositing onto the display