This document provides an overview of OpenGL including:- What OpenGL is and why computer graphics are used. - A brief history of cathode ray tubes and their role in early computer displays.- How OpenGL was developed in the 1990s by Silicon Graphics and later managed by Khronos Group.- Some advantages of OpenGL like cross-platform support and extensibility.- How OpenGL is implemented on Windows. - The introduction of DirectX by Microsoft.- Requirements to use OpenGL like having a graphics card from Nvidia's Fermi family or AMD's Radeon HD 5000 series.

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  Open Graphics Library(OpenGL)PresentedbyAbu SayemDept.of CSE,PUST
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  OVERVIEW1. What isOpenGL2. Why we use computer Graphics3. CRT4. OpenGL in Decade5. Advantages of OpenGL6. OpenGL on Windows7. DirectX8. The new OpenGL9. Software Pipeline10. Requirements
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  What is OpenGLOpenGL is a software interface that allows aprogrammer to communicate with graphics hardware.
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  Why we useCG computer graphics are used to give more effects ormore picture quality and also improves theperformance in some games or applications.
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  Cathode Ray TubeIn 1897, Ferdinand Braun invented the CRT (CathodeRay Tube) in Germany as a type of vacuum tube whosepurpose was to display an image onto a screen. CRTs allowed the operators to instantly see the outputof a computer program without having to interpretpunch cards, rows of lamps or sort through reams ofprintouts. CRTs were already being used for television andoscilloscope output.
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  OpenGL in DecadeSilicon Graphics (commonly referred to as SGI) was acompany founded in 1981 that specialized in 3Dcomputer graphics and developed software andhardware specifically for this purpose. In the early 1990s, SGI was the market leader in 3Dgraphics workstations because of their highperformance hardware and easy to use software.
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  Advantages of OpenGLOpenGL is supported across many platforms anddevices. The greatest advantage that OpenGL provides toimplementers is its support for extensions. OpenGL is portable. - OpenGL has more detailed documentation thanDirect3D.
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  OpenGL on WindowsOpenGL was already being implemented on UNIXbased workstations when Microsoft entered themarket with their workstation operating system,Windows NT in 1993. Windows NT introduced features that are still beingused today, such as the Win32 API for creatingWindows applications.
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  DirectX Microsoft hadto acquire a company namedRenderMorphics in 1995, who produced a 3D graphicsAPI called Reality Lab. This API was renamed and shipped as Direct3D in anSDK (Software Development Kit) called DirectX thatbundled a few other game development-specific APIsas well: DirectDraw for drawing fast 2D graphics. DirectInput for capturing joystick input. DirectPlay for networking and communication.
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  The new OpenGLIt was announced at the 2006 SIGGRAPH thatOpenGL would be managed by the Khronos Group inthe future instead of SGI. The Khronos Group is a consortium of hardware andsoftware vendors with a vested interest in OpenGLthat focuses on the creation and maintenance of openstandards APIs.
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  Software Pipeline Thefirst is the Application layer, which is yourprogram, the program that invokes drawingcommands. The next layer is the Abstraction layer, whichcontains the OpenGL or Direct3D APIimplementations. The abstraction layer passes its commands to theDevice Driver, a software communication layer to thehardware.
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  RequirementsSystem Requirement: Ifyou own an NVIDIA GPU, it must at least be in theFermi family of products, starting with the GeForce GTX400 series. If you own an AMD/ATI GPU, it must at least be in theRadeon HD 5000 series.Software Requirements:. The main thought behind OpenGL is portability, so thecode mentioned in the book will be portable acrossmultiple platforms as well.
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  Thanks to all