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Windows Display Driver Model (WDDM, [1] initially LDDM as Longhorn Display Driver Model and then WVDDM in times of Windows Vista) is the graphic driver architecture for video card drivers running Microsoft Windows versions beginning with Windows Vista.
Network device drivers for Windows XP use NDIS 5.x and may work with subsequent Windows operating systems, but for performance reasons network device drivers should implement NDIS 6.0 or higher. [8] Similarly, WDDM is the driver model for Windows Vista and up, which replaces XPDM used in graphics drivers.
In Windows Vista, the Windows Display Driver Model (WDDM) does not support two different display adapters. When using two display adapters, both must use the same WDDM driver. Although Windows Vista still supports XPDM drivers, a WDDM driver is required for the Windows Aero user experience. [54] [55]
A new user-mode driver model called the User-Mode Driver Framework. In Windows Vista, WDDM display drivers have two components, a kernel mode driver (KMD) that is very streamlined, and a user-mode driver that does most of the intense computations. With this model, most of the code is moved out of kernel mode.
DWM works in different ways depending on the operating system (Windows 7 or Windows Vista) and on the version of the graphics drivers it uses (WDDM 1.0 or 1.1). Under Windows 7 and with WDDM 1.1 drivers, DWM only writes the program's buffer to the video RAM, even if it is a graphics device interface (GDI) program.
As a result, Windows Aero has significantly higher hardware requirements than its predecessors; video cards must support 128 MB of memory, 32 bits per pixel, DirectX 9, Pixel Shader 2.0, and the new Windows Display Driver Model (WDDM). Windows Vista Standard
The December CTP was also the last build of Windows Vista that supported the bypassing of the WDDM driver model requirement, hence allowing the Desktop Window Manager (UXSS at the time of the build) to run using software vertex emulation. Because of this change post the 5270 builds, the well-known keys 'UseMachineCheck' and 'EnableMachineCheck ...
User-Mode Driver Framework (UMDF) is a device-driver development platform first introduced with Microsoft's Windows Vista operating system, and is also available for Windows XP. It facilitates the creation of drivers for certain classes of devices.