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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 ?
The museum wanted a technology that would have their audiences blown away by the new experience, but were mindful that they needed to stay on budget, added Derek Threinen, vice president, Film Distribution and Business Development, Giant Screen Films / D3D Cinema.
Art Mercurio, VP of Technology at D3D Cinema, adds: "As a 3D system integrator, we're particularly excited about the light levels that lasers can achieve.
Dome theaters have waited a long time for digital projection technology to evolve to a capable solution that can rival or exceed the quality of 70 mm, said Don Kempf president and founder of D3D.
This installation marks a great step forward for giant screen projection technology and Moody Gardens has once again taken a pioneering step with D3D to create a truly great theater experience for their audience, said Don Kempf, president of D3D Cinema.
D3D President Don Kempf said: "We are at a unique period in cinematic history.
This is the game-changing milestone that the museum giant screen industry has longed to achieve for many years," said Don Kempf, president and founder of D3D Cinema.
Minimum system requirements are Windows(R) 95 or Windows 98 (Windows NT is not supported), 200 MHz or faster Intel(R) Pentium(R) MMX, Cyrix M2 or AMD(R) processor, 32MB Win 95/98, 4x or faster CD-ROM/DVD drive (600K/second transfer rate) using 32-bit Windows 95/98 driver, 150 MB free hard disk space plus space for saved games, Windows swap-file, and DirectX(tm) 7 installation, hardware accelerated D3D compatible 4MB video card with DirectDraw(TM) compatible driver and a sound card with DirectSound(TM) support.
The game has been optimized for both D3D and Glide acceleration, as well as providing a software-only mode.
Initial testing of a sample Xtreme 166 accelerator shows at least a 21% performance increase over existing Savage4 accelerators in every D3D and OpenGL-based benchmark we've tested," said Dean McCarron, principal analyst at Mercury Research and an editor of www.
Unreal D3D is much smoother at high resolutions with the Detonator drivers.
It's very exciting to those of us who've been playing Quake-based Team Fortress, because we can finally play Team Fortress with viewable weapon models, decals, D3D acceleration, and all the other great Half-Life engine functionality.