DirectX

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DirectX

(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).

http://microsoft.com/directx/.

DirectX

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
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It uses a highly integrated System-on-Chip, enabling High-Definition output for business and consumer applications -- A graphics accelerator operates through GDI and DirectDraw for fast display composition -- Video and audio decoders for VC-1, H.
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All is accessible over narrowband communication with extremely thin client viewer, as a software only solution with no hardware support, including DirectX, DirectDraw or OpenGL support.
0, TrueTime Driver Edition now lets developers instrument and automatically profile DirectDraw and Direct3D graphic functions as well as NDIS 5.
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Minimum system requirements include Windows ME/Windows 2000 Professional/Windows XP Home/Windows XP Professional, AMD Athlon(TM) 500MHz or Intel Pentium(TM) III 600MHz or higher, 128MB of RAM, Ultra ATA/66 or faster hard drive, PCI sound system supporting 48 kHz audio-out and analog-in, graphics card with DirectDraw off-screen overlay and DirectX 8-compliant 1024x768 color resolution, a free PCI slot (v2.
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On a Windows system, the minimum system requirements include Windows ME/2000 Professional/XP Home Edition/XP Professional, AMD Athlon 500 MHz or Intel Pentium III 600 MHz or higher, 128 MB of RAM, Ultra ATA 66 or higher hard drive, PCI sound system supporting 48 KHz audio-out and analog-in, graphics card with DirectDraw off-screen overlay and DirectX8 compliant 1024x768 color resolution, a free PCI slot (v2.
DirectShow, DirectDraw, DirectSound, Windows, and Windows CE are trademarks of Microsoft Corporation.
DirectShow, DirectDraw, DirectSound, Windows, Windows 95, Windows98, Windows NT, Windows2000, and Windows Millennium Edition are trademarks of Microsoft Corporation.