Xlib is a library which provides functions for applications running under the X Window System (also referred to as X). This includes window management as well as event handling. X is a network orientated system: An application which is running on computer A can send its graphical output to computer B, which is located somewhere else in the network (the network can be a LAN as well as the internet), and can receive events like keyboard or mouse input from computer B. This requires that a program called the \u00ab\u00a0X-Server\u00a0\u00bb is running on both computers. In Linux, the X-server is started with the command startx. You will most probably not have to start the X-server manually, because most Linux Distributions will set up the system to automatically start X after booting.<\/p>\n
In the following, a small program framework will be developed, which uses the GLX extension to the X windows system. Only little knowledge of X will be needed; for a comprehensive introduction to X the \u00ab\u00a0Xlib Programming Manual\u00a0\u00bb by Adrian Nye can be recommended.<\/p>\n
The program starts with the inclusion of the header files:
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