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Encyclopedia > Windows Display Driver Model

Windows Display Driver Model (WDDM) is the new graphic driver model for video cards running under Windows Vista. Windows XP loading drivers during a Safe Mode bootup A device driver, or software driver is a computer program allowing higher-level computer programs to interact with a computer hardware device. ... A video card, (also referred to as a graphics accelerator card, display adapter, graphics card, and numerous other terms), is an item of personal computer hardware whose function is to generate and output images to a display. ... Windows Vista is a line of graphical operating systems used on personal computers, including home and business desktops, notebook computers, Tablet PCs, and media centers. ...


According to Microsoft:

"The Windows Vista desktop is being drawn in a completely different way from all previous versions. Every window will have its own, full window-sized surface to draw to. The desktop will be dynamically composed many times a second from the contents of each window. The goal for desktop composition is to enable compelling new visual effects for both the Windows user interface and for applications created by third-party developers, all shown on increasingly affordable, high-density displays.
To achieve this enhanced desktop experience, a new display driver model has been designed to radically advance functionality, stability, and reliability. Coupled with acceleration provided by current and future graphics hardware, this new graphics driver model enables Windows Vista to deliver a higher level of performance and quality, and a new desktop experience."[1]

Windows Vista includes WDDM Version 1.0.


At WinHEC 2006, Microsoft talked about how it was planning a major change to WDDM to allow for better scheduling of tasks (multitasking) on GPUs. WDDM 1.0 only allows rudimentary task scheduling. The upcoming WDDM 2.0, on which Microsoft has not put an introduction date, will require a new generation of GPUs.[2] The Windows Hardware Engineering Conference (WinHEC) is the annual conference where Microsoft sets out its hardware plans for Microsoft Windows-compatible PCs. ... Multitasking may refer to any of the following: Computer multitasking - the apparent simultaneous performance of two or more tasks by a computers central processing unit. ... GeForce 6600GT (NV43) GPU Radeon 9800 Pro (R350) GPU Intel GMA X3000 IGP “GPU” redirects here. ...


Limitation

The older model, Windows XP Display Driver Model (XPDM), still works in Vista via the legacy graphics stack. However, WDDM drivers do not support "heterogeneous multi-adapter" multi-monitor implementations. All graphics adapters in the system must use the same display driver model, either XPDM only or WDDM only, but not both at the same time. In addition, if multiple graphics adapters are present in the system, all of them must use the same WDDM driver; if two adapters have different WDDM drivers, Vista will disable one of them.[3]


Notes and references

  1. ^ Microsoft Corporation (November 11, 2005). Graphics Hardware and Drivers for Windows Vista. Microsoft Corporation. Retrieved on 2006-06-02.
  2. ^ Dan Warne (June 1, 2006). Windows graphics system to be overhauled. APC Magazine. Retrieved on 2006-06-02.
  3. ^ MultiMonitor Support and Windows Vista. Retrieved on 2007-06-30.

November 11 is the 315th day of the year (316th in leap years) in the Gregorian calendar, with 50 days remaining. ... Year 2005 (MMV) was a common year starting on Saturday (link displays full calendar) of the Gregorian calendar. ... Year 2006 (MMVI) was a common year starting on Sunday (link displays full 2006 calendar) of the Gregorian calendar. ... is the 153rd day of the year (154th in leap years) in the Gregorian calendar. ... June 1 is the 152nd day of the year (153rd in leap years) in the Gregorian calendar. ... Year 2006 (MMVI) was a common year starting on Sunday (link displays full 2006 calendar) of the Gregorian calendar. ... Year 2006 (MMVI) was a common year starting on Sunday (link displays full 2006 calendar) of the Gregorian calendar. ... is the 153rd day of the year (154th in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era. ... is the 181st day of the year (182nd in leap years) in the Gregorian calendar. ...

External links

  • MSDN Library - WDDM introductory article
  • Windows Hardware and Drivers Central - video hardware white papers and presentations
  • Links to lists of GPUs that will support WDDM - hosted by Microsoft

 

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