The document provides an overview of DirectX, including its history, architecture, libraries, and comparison to OpenGL. It discusses how DirectX is a collection of APIs from Microsoft that allows low-level access to graphics cards, sound devices, and other hardware from a Windows system. The architecture uses HAL and HEL drivers to interface with hardware and a DDI layer between programs and devices. Libraries cover 3D graphics, input, networking, sound, and multimedia. DirectX is designed for gaming and multimedia on Windows, while OpenGL is platform-independent and aimed at general 2D/3D graphics.

1. of DirectX…
--
Prabodh Panda

2. Agenda
• Warm Up
– Graphics Card
– Computer Graphics
– Image Types
– GDI / GDI+
– OpenGL (Open Graphics Library )
• Introduction to DirectX
– History
– Architecture
– Library
• DirectX vs OpenGL
• Demo
• Hello world Program
• Questions & Discussions

3. Warm Up …

4. Graphics Card
• Part of the computer that controls and enhances graphics(Picture, Video, 3D
animation) that are displayed in the computer screen.
• Types of Graphics card :
– AGP
– PCI
– On Board

5. Computer Graphics
• Representation and manipulation of Image data by a computer.
– The development of CG has made it easy for us to interact with the computer.
– CG has brought about a revolution in the fields of :
 Animation
 Movies(Spl. Effects)
 Video Games
 Scientific Research
 Industrial automation
 Flight Simulation

6. Image Types
• 2D Computer Image
– Raster Image
– Vector Image
• 3D Computer Image

7. Raster Graphics
• It is a data structure representing a rectangular grid of pixels or points of colors.

8. Vector Graphics
• It uses geometrical primitives like points, lines, curves & Polygons) based on
mathematical equation to represent Images.

9. Raster vs. Vector

10. 3D Computer Graphics
• The use the 3 dimensions (X,Y & Z) axis for the representation of image data.

11. Computer Generated Imagery
(CGI)
• Popularly known as Computer Animation.
• It is the field of Creating 3D images move.
• Movie Industry
– Animation Movies
– Generating Spl. Effects

12. GDI / GDI+
• Enables window based Application to use graphics and formatted text on both
video display and printer.
• Drawing fonts ,Lines , Curves and handling palettes.
Window Application
GDI / GDI+ x
Window Graphics Driver
• GDI cannot access complex graphics and needs OpenGL or DirectX for
graphics rendering.

13. GDI / GDI+ Objects in MFC

14. OpenGL
• Open Graphics Library (OpenGL) is a cross platform API for 2D/3D computer
graphics.
• OpenGL was developed by Silicon Graphics Inc. (SGI) in the year 1992.
• Cross platform (Windows, Linux and Mac OS)
• Used in
– CAD
– Virtual Reality
– Flight simulation
– Scientific
– Video Games
vs.

15. DirectX
• Low level API’s Provided by Microsoft for
– Creating Games
– Multimedia Application
– 2D and 3D Support
– Network Application (e.g. Multiplayer games)
• Works only with windows Platform(95/98/ME/2000/xp/vista/Win 7)
– Released Version 1.0 to latest Version 11.0
– Win Xp Supports DirectX 9.0
– Vista Supports DirectX 10.0
– Win 7 Supports DirectX 11.0

16. History
• Craig Eisler, Alex St. John, and Eric Engstrom creators of DirectX.
• Direct Access : DirectX (Video Cards, M, Sound Device and other Hardware).
• DirectX1.0 -- Sep 1995 as Windows Games SDK.
• DirectX 11.0 is the latest SDK.

17. Architecture

18. HAL / HEL
DirectX uses two drivers to send request to graphics hardware devices
• Hardware Abstraction Layer (HAL) : Uses hardware function capability.
• Hardware Emulation Layer (HEL) : Use to emulate capability through software.
Device Driver Interface (DDI)
• It is layer to allow high level computer programs to interact with hardware devices

19. Library
DirectX is SDK composed of collection of COM libraries
• Direct3D
– API to provide 2D and 3D graphics.
– Setting resolution to the screens.
• DirectInput
– All user input is handles through API.
– It supports devices such as keyboard, mouse, gamepad and joysticks.
• DirectPlay
– Network Support like multiplayer API.

20. Library (cont…)
• DirectSound
– API for Sound Effect.
– Include Support for more than One or more sound files.
• DirectMusic
– Allow to make dynamic soundtrack.
• DirectShow
– Accessing Cut Scenes.
– Streaming Audio (mp3, AVI, MPEG..).
• DirectSetup
– Create a Setup wizard for your game.

21. DirectX vs. OpenGL
 Controlled by Microsoft.  Controlled by ARB OpenGL
 Gaming and Multimedia  General Purposes 2D and 3D
Programming graphics.
 Support Windows OS.  Platform Independent (Window,
Linux, Unix and Mac )
 Difficult to Learn
(Less Documentation provided)  Easy to learn.
 API : COM  API : Includes and Library
 Vertex Blending : Yes  Vertex Blending : NA
 Two-sided lighting: No  Two-sided lighting: Yes

22. DirectX SDK
• MSDN website

23. Visual Studio Setup

24. My First DirectX Program.. 

25. Demo

26. Books & References

27. Questions & Discussions

28. Thank You all…