Programming - Games - OpenGL and C++

This tutorial was written for me by Imran Khan (imranahmedkhan82@hotmail.com, iak1982@yahoo.com).
Copyright (c) 2004 is owned by Martin Baker

Introduction to OpenGL :

OpenGL is a library of functions for fast 3D rendering.It's a hardware and system independent interface. An OpenGL application will work on every platform, as long as there is an installed implementation.Some of the OpenGL Features are as follows :

• Varying graphics capabilities without compromising the graphics performance of the underlying hardware and without
  sacrificing control over the hardware’s operation.

• A natural interface that allows a programmer to describe rendering operations tersely.

• OpenGL is Flexible . It can accommodate extensions so that newgraphics operations can be added without disrupting the original interface.

• Its simple, direct interface to the fundamental operations of 3D graphics rendering.

• Provides basic graphics primitives to draw Points, Lines, Traingles etc

  GL_POINTS - dots
  GL_LINES – lines, in pairs
  GL_LINE_STRIP – polylines
  GL_LINE_LOOP – closed loop
  GL_TRIANGLES – triangles, three vertices
  GL_QUADS – quad, four vertices
  GL_POLYGON – convex filled polygon

• Provides Camera Effect.

• Provides Lightning effect.

• Easy Interaction with the Hardware.

• For the sake of Hardware independecy, OpenGL provides its own datatypes :

OpenGL datatypes :

C++	OpenGL
Unsigned int Unsigned short Unsigned char Double Float Int Short Signed char	GLuint GLushort GLubyte GLDouble GLFloat GLInt GLShort GLByte

• Opengl Command format is very easy. You can understand it easily from the figure below :

In this Diagram we explained that if we have a command " glVertext2i(...) " then wat will be its format.

 

I hope its enough theory. Now lets start with the Tutorial.