![]() ![]() Also, do not include Initguid.h inside a precompiled header file, because in effect the precompiled header is included in every source file. If you do not include Initguid.h in any of the source files, you will get a link error "unresolved external symbol." If you include Initguid.h twice for the same GUID, you will get a compile error "redefinition multiple initialization." To resolve these errors, make sure that Initguid.h is included exactly once. When the Initguid.h header file is included, it redefines the DEFINE_GUID macro so that DEFINE_GUID creates a defining declaration of the GUID. Wherever the Initguid.h header file is not included, the DEFINE_GUID macro creates an extern reference to the GUID value. In exactly one of the source files, include the header file Initguid.h before your header file. Include this header file in every source file that references the GUID. (Where this example has zeroes, put the actual GUID values.) You can use the Guidgen.exe utility to create a new GUID and paste it into the header file in the DEFINE_GUID format. With the DEFINE_GUID macro, you can use the same header file for both purposes. The GUID value must be defined exactly once in your project, and the other source files must declare extern references to it. For example, suppose that your project has three source files, Src1.cpp, Src2.cpp, and Src3.cpp, and all three files use a certain GUID value that you have defined. See DirectX 10, DirectX 11, GDI, video accelerator and DirectSound.The DEFINE_GUID macro solves the problem of declaring extern references to GUID values in your source code. It can also occur if your hardware does not support 3D acceleration or if your device driver does not properly support DirectX7. Microsoft does not create all these objects hardware drivers. For example, NetMeeting’s desktop sharing feature may be enabled or you are trying to run this app through a remote desktop in Windows XP or Terminal Server. Look under System Information for the DirectX Version number. The DirectDraw architecture consists of multiple components. The sound and video cards on your Windows 10 PC are examples of dedicated hardware utilized by the system to boost output. The point of hardware acceleration is to boost either speed or performance, but usually both. To determine which version of DirectX is installed in your PC, select Run from the Start menu, type in dxdiag and click OK. With hardware acceleration, the application uses dedicated hardware components on your PC to carry out the work more speedily and efficiently. Through the Hardware Emulation Layer (HEL), DirectX is capable of emulating graphics functions in software that are not built into the graphics card. ![]() ![]() When DirectX was introduced, vendors quickly developed drivers that exposed low-level functions of their graphics hardware to the application. To obtain the speed, gaming companies had to write drivers for a variety of graphics cards, which was a development headache.ĭirectX 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. Before DirectX, games for the PC were written in DOS in order to redraw the screen fast enough for real-time animation. The first DirectX API was introduced in late 1995 to encourage game developers to move their software to Windows. This release was the first to include DirectDraw with hardware acceleration, replacing the. ![]() DirectX provides a high-level interface for accessing low-level functions "directly." It accesses the hardware abstraction layer in Windows (see HAL). Direct3D 8.0 also eliminated DirectDraw as a separate API. Windows developers program to the DirectX APIs, and the manufacturers of sound and graphics cards write DirectX drivers to be included with their hardware. This article is provided by FOLDOC - Free Online Dictionary of Computing ( ) DirectXA set of Windows interfaces from Microsoft for programming graphics and sound. ![]()
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