DirectX, then, was the generic term for all of these APIs and became the name of the collection. Originally, the names of these APIs all began with Direct, such as Direct3D, DirectDraw, DirectMusic, DirectPlay, DirectSound, and so forth.
Microsoft DirectX is a collection of application programming interfaces (APIs) for handling tasks related to multimedia, especially game programming and video, on Microsoft platforms. All future DX11 hardware will also support DX10.1 in order to be DX11 compliant. As of November 29, 2008, only ATI's HD4000 and HD3000 series and S3's chrome 4xx GTX series of GPUs are fully compliant, Nvidia has yet to release a DX10.1 compliant card. Direct3D 10.1 still fully supports Direct3D 10 hardware, but in order to utilize all of the new features, updated hardware is required.
It also adds support for parallel cube mapping and requires that the video card supports Shader Model 4.1 or higher and 32-bit floating-point operations. This release mainly sets a few more image quality standards for graphics vendors, while giving developers more control over image quality. Direct3D 10.1 is an incremental update of Direct3D 10.0 which is shipped with, and requires, Windows Vista Service Pack 1.
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