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Video memory was shared with the first 128 KiB of RAM. The exact size of the video memory could be reconfigured by software to meet the needs of the current program. An early hybrid system was the Commodore Amiga which could run as a shared memory system, but would load executable code preferentially into non-shared "fast RAM" if it was available.
With shared video memory, an application must constantly check that it is only writing to memory that belongs to that application. When running a high-bandwidth video application such as a movie player or some games, the computing power and complexity needed to perform constant clipping and checking negatively impacts performance and compatibility.
Windows Vista Basic has video card requirements similar to Windows XP, and it is the default visual style of Windows Vista Starter and on systems without support for Windows Aero. Before Windows Vista SP1, machines that failed Windows Genuine Advantage product license validation would also revert to this visual style.
WDDM drivers allow video memory to be virtualized, [6] and video data to be paged out of video memory into system RAM. In case the video memory available turns out to be insufficient to store all the video data and textures, currently unused data is moved out to system RAM or to the disk. When the swapped out data is needed, it is fetched back.
The Windows Vista version can use only the Enhanced Video Renderer (EVR). Support for live scrubbing or live seeking, that is, the ability to show the video frame after seeking with the mouse or after clicking with the mouse while paused is not available in the version of Windows Media Player 11 in Windows Vista and later but is supported in ...
Includes enhanced support for Non-Uniform Memory Access (NUMA) and systems with large memory pages. Windows Vista also exposes APIs for accessing the NUMA features. Memory pages can be marked as read-only, to prevent data corruption. New address mapping scheme called Rotate Virtual Address Descriptors (VAD). It is used for the advanced Video ...
Windows Vista: Windows Vista — Video for Windows: Multimedia framework API Windows 3.1: Windows 95: DirectShow: Windows Address Book: List of contacts that can be shared by multiple apps Contact manager Internet Explorer 3: Windows XP: Windows Contacts, People, or Windows Live Mail: Windows Desktop Gadgets: Widget engine for Microsoft Gadgets ...
in "high-resolution mode" it was often the case that a certain pixel could not be given an arbitrary color, often certain clusters of pixels, (quite often 8×8 pixels large) shared the same "color attribute", so as to spare video memory, as an 8-bit computer only had a 64 KB address space, and the CPU often had limited capabilities to ...