Windows Display Driver Model

Windows Display Driver Model (WDDM)

function

WDDM enables users to run multiple GPu-intensive applications simultaneously. A Direct3D surface memory area containing textured meshes for rendering 2D or 3D scenes. WDDM allows different itineraries (processes) to share the entire Direct3D surface. Before WDDM was introduced, sharing textures between processes was difficult because it would require copying data from video memory to system memory and then back to the video memory of the new device. Once a WDDM driver fails, the graphics stack restarts the driver. Graphical hardware failures are also intercepted and drivers are reset if necessary. WDDM also allows you to reset the display device if the display driver fails, without having to restart it. In WindowsXP, 20% of system blue screens were caused by a graphics driver. The WDDM display driver has two components at the technical level: a very advanced kernel-mode driver (KMD) and a user-mode driver that performs most of the intensive computing. With this model, you have moved most of the code out of kernel mode. Since the daily display related operations only operate in user mode, the system stability is greatly improved.