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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.
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