Longhorn uses the Windows Graphics Foundation, or WGF. WGF 1.0 will use DirectX 9.0c as it's primary interface, but Longhorn will also have the Next-Gen 3D API build in. You can see it as DirectX 10, but it's called WFG 2.0. One of the important features of WGF is the Longhorn Display Driver Model (LDDM). It is possible with LDDM to install a new graphics driver without even rebooting your system. LDDM will ship in two stages. The first, called basic, supports current generation graphics hardware: shader model 2.0 and 3.0 capable hardware. The second stage of LDDM, "advanced," will support hardware features that ship ar the same time or after Longhorn is released, but will work with the new features in WGF 2.0. Because of the competitive way of graphics hardware development, we'll probably see advanced LDDM capable hardware before Longhorn is released. The current Windows XP driver model is still supported, but will be frozen going forward.

Guru 3D