Microsoft DirectX is a collection of application
programming interfaces (APIs) for handling tasks related to multimedia,
especially game programming and video, on Microsoft platforms.
Originally, the names of these APIs all began with "Direct", such as
Direct3D, DirectDraw, DirectMusic, DirectPlay, DirectSound, and so
forth. The name DirectX was coined as a shorthand term for all of these
APIs (the X standing in for the particular API names) and soon became
the name of the collection.
When Microsoft later set out to develop a gaming
console, the X was used as the basis of the name Xbox to indicate that
the console was based on DirectX technology.[2] The X initial has been
carried forward in the naming of APIs designed for the Xbox such as
XInput and the Cross-platform Audio Creation Tool (XACT), while the
DirectX pattern has been continued for Windows APIs such as Direct2D and
DirectWrite.
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