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(programming, hardware)
A Microsoft programming interface standard, first included with Windows 95. DirectX gives (games) programmers a standard way to gain direct access to enhanced hardware features under Windows 95 instead of going via the Windows 95 GDI. Some DirectX code runs faster than the equivalent under MS DOS.

DirectX promises performance improvements for graphics, sound, video, 3D, and network capabilites of games, but only where both hardware and software support DirectX.

DirectX 2 introduced the Direct3D interface. Version 5 was current at 1998-02-01. Version 8.1 is included in Windows XP.

Latest version: 8.1 (as of 2001-12-31).


A set of Windows interfaces from Microsoft for programming graphics and sound. Windows developers program to the DirectX APIs, and the manufacturers of sound and graphics cards write DirectX drivers to be included with their hardware. DirectX provides a high-level interface for accessing low-level functions "directly." It accesses the hardware abstraction layer in Windows (see HAL).

The first DirectX API was introduced in late 1995 to encourage game developers to move their software to Windows. Before DirectX, games for the PC were written in DOS in order to redraw the screen fast enough for real-time animation. To obtain the speed, gaming companies had to write drivers for a variety of graphics cards, which was a development headache.

A Single Graphics Interface for Windows
DirectX provides the interface to access the frame buffer and advanced features of the graphics card, which are not provided in the standard Windows GDI graphics interface. When DirectX was introduced, vendors quickly developed drivers that exposed low-level functions of their graphics hardware to the application.

Emulate Graphics Functions in Software
Through the Hardware Emulation Layer (HEL), DirectX is capable of emulating graphics functions in software that are not built into the graphics card. See graphics pipeline.

Which DirectX Version Is Running?
To determine which version of DirectX is installed in your PC, select Run from the Start menu, type in dxdiag and click OK. Look under System Information for the DirectX Version number. See DirectX 10, DirectX 11, GDI, video accelerator and DirectSound.

DirectXInterface      Purpose

 DirectCompute  GPGPU computing

 DirectDraw     2D graphics

 Direct3D       3D graphics

 DirectSound    audio

 DirectSound3D  game audio

 DirectPlay     multi-player games

 DirectInput    game input

 DirectVoice    game audio chat

 DirectShow     streaming media

 DirectVideo    earlier video API
References in periodicals archive ?
Recommended: Pentium(R) 200 MHz MMX or equivalent, 155MB available hard drive space (additional HD space required for Direct X installation and Windows swap file), 4MB AGP or PCI supported 3D accelerated video card, DirectInput compatible gamepad.
NOTE: Microsoft, DirectX, Windows, Direct3D, DirectPlay, DirectInput, DirectShow and Windows Media are either registered trademarks or trademarks of Microsoft Corp.
Key areas include real-time rendering of complex 3D textures with Direct3D hardware acceleration; high-quality sound and 3D audio positioning with DirectSound; and support for alternative input devices such as virtual reality headgear with DirectInput.
The Audia3D also supports a variety of multimedia sound standards, including General MIDI compliant wavetable synthesis, multi-channel digital audio mixing, DirectInput, SoundBlaster Pro software emulation, Windows Sound System and the MPU-401 MIDI interface.
0 runs as a native Netscape plug-in and Microsoft Internet Explorer ActiveX control, and supports the Microsoft DirectX platform, including Direct3D hardware acceleration, DirectInput and DirectSound.
NOTE: Microsoft, DirectX, Windows, DirectDraw, Direct3D, DirectSound, DirectMusic, DirectInput, DirectPlay, DirectShow and Windows Media are either registered trademarks or trademarks of Microsoft Corp.
The OTI-610 supports a number of multimedia sound standards, including General MIDI compliant wavetable synthesis, multi-channel digital audio mixing via Microsoft's DirectSound, DirectInput, SoundBlaster Pro software emulation through Microsoft's DirectX environment, Windows Sound System, and the MPU-401 MIDI interface.
0, EAX, DirectSound, DirectSound3D, and DirectInput
0 supports DirectSound, for 3D spatialized sound, and DirectInput which supports emerging input devices that make navigating 3D environments more natural.
Standard analog joystick interface with digital DirectInput mode
This game uses DirectX(TM) technology including DirectSound, Direct 3D, and DirectInput and is 100% Windows(R) 95 compatible.
NOTE: Microsoft, DirectX, Windows, Windows NT, Win 32, Direct3D, DirectDraw, DirectSound, DirectMusic, DirectInput, DirectPlay, DirectShow and DirectAnimation are either registered trademarks or trademarks of Microsoft Corp.