1 / 10

DirectX

DirectX. CIS 487/587 Bruce R. Maxim UM-Dearborn. DirectX and Win32. Win32 Application GDI Windows Device Driver Interface DirectX DirectX Graphics (DirectDraw/Direct3D) DirectX Audio (DirectSound/DirectSound3D/DirectMusic) DirectInput DirectPlay DirectSetup DirectShow. DirectX.

conor
Download Presentation

DirectX

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. DirectX CIS 487/587 Bruce R. Maxim UM-Dearborn

  2. DirectX and Win32 • Win32 Application • GDI • Windows Device Driver Interface • DirectX • DirectX Graphics (DirectDraw/Direct3D) • DirectX Audio (DirectSound/DirectSound3D/DirectMusic) • DirectInput • DirectPlay • DirectSetup • DirectShow

  3. DirectX • Contains a run-time library consisting of several .dll’s that you may distribute with your application • There are several .lib and .h files that make-up the development library • You need to be sure that you know where these files are housed • DirectX is backward compatible

  4. COM • COM allows DirectX to work with multiple programming languages • COM objects can be shipped with an application as .dll’s • COM object provide interfaces to hardware objects • COM objects are loaded dynamically • You can add functionality to an installed application simply by updating the COM object

  5. DCOM • An advanced version of COM • Allows applications to access DCOM objects on networked machines

  6. DirectX Architecture Win32 App Win GDI DirectX Win DDI HEL: HW Emulation Layer HAL: HW Abstraction Layer HW Audio, Video, Input, Storage, …

  7. HAL and HEL • HAL • Lowest level of software • Consists of manufacturer’s device drivers • DirectX figures out the COM interface needed • HEL • Built on top of HAL • Allows emulation of missing hardware (e.g. program still runs whether 3D graphics accelerator card is present or not)

  8. COM Interfaces • The process of creating a COM interface is described in the text • You do not need to create your own COM interfaces if you use DirectX • DirectX provides wrappers round the COM stuff

  9. Creating COM Interfaces • You begin by deriving an interface class from IUnknown (COM base class) • Every derived class inherits 3 methods • QueryInterface( ) – used to request pointer to interface • AddRef( ) – used to increase reference count for COM object • Release( ) – decrements COM object reference counter

  10. Creating COM Interfaces • Basic technique is to create pointers to each device specific function and equate them to a generic function pointer • DirectX will then be able to use the correct COM object when its function is referenced

More Related