You might wonder why installation of graphics drivers is placed alongside information on games. For the most part, 3D acceleration is not a necessity if you are using Fedora for productivity only. However, if you are intending to work off a bit of aggression by blowing away some opponents in Unreal Tournament, you are going to need 3D acceleration enabled, and you need the specific graphics drivers for that.
After you have verified your graphic driver situation, you will find a menu option under System, Preferences, Look and Feel, called Desktop Effects (see Figure 3.3). Open it and select the option to Enable Desktop Effects. After a couple of seconds, you may see your window decorations (title bar, minimize and maximize buttons) disappear and then reap pear. It may seem that nothing has happened, but check the box to activate Wobbly Windows and then grab hold of the window title bar and move it around. If everything has gone according to plan, it should wobble! Click Keep Settings to save the settings, and welcome to a world of fancy effects.
FIGURE 3.3 Use the Desktop Effects tool to set the scene for some snazzy 3D effects.
The 'wobbly windows' are the most obvious effect, and it provides a fluid effect when you move your windows around the desktop area. Or if you hold down the Ctrl and Alt keys and press either the left or right cursor button, your desktop should move as if it is part of a cube, taking you from one virtual desktop to another.
This technology is still very much in its infancy, so expect great things in future versions!
Basic X Concepts
The underlying engine of X11 is the X protocol, which provides a system of managing displays on local and remote desktops. The protocol uses a client/server model that allows an abstraction of the drawing of client windows and other decorations locally and over a network. An X server draws client windows, dialog boxes, and buttons that are specific to the local hardware and in response to client requests. The client, however, does not have to be specific to the local hardware. This means that system administrators can set up a network with a large server and clients and enable users to view and use those clients on workstations with totally different CPUs and graphics displays.
We couldn't think of a better way to demonstrate the capability of X to handle remote clients than by using its capabilities to produce this chapter. Although the OpenOffice.org file for this chapter resided on a Mac mini (running Fedora), the display and keyboard used were actually part of an Acer Ferrari notebook running Ubuntu 6.06 LTS, via an ethernet connection. Revisions were done with the Logitech keyboard and mouse of a desktop machine running Fedora 8, again connected to the Mac mini via X, but this time using a wireless connection.
Because X offers users a form of distributed processing, this means that Fedora can be used as a very cheap desktop platform for clients that connect to a powerful X server. The more powerful the X server, the larger the number of X-based clients that can be accommodated. This functionality can breathe new life into older hardware, pushing most of the graphical processing on to the server. A fast network is a must if you intend to run many X clients because X can become bandwidth-hungry.
X is hugely popular in the UNIX and Linux world for a variety of reasons. It supports nearly every hardware graphics system, and strong multiplatform programming standards give it a solid foundation of developers committed to X. Another key benefit of X is its networking capability, which plays a central point in administration of many desktops and can also assist in the deployment of a thin-client computing environment. The capability to launch applications on remote desktops and also standardize installations high light the versatility of this powerful application.
More recent versions of X have also included support for shaped windows (that is, nonrectangular), graphical login managers (also known as display managers), and compressed fonts. Each release of X brings more features designed to enhance the user experience, including being able to customize how X client applications appear, right down to buttons and windows. Most office and home environments run Linux and X on their local machines. The more-enlightened companies and users harness the power of the networking features of X, enabling thin-client environments and allowing the use of customized desktops designed specifically for that company. Having applications launch from a single location makes the lives of system administrators a lot easier because they have to work on only one machine, not several.
Using X
X.Org 7.3 is the X server that is used with Fedora. The base Xorg distribution consists of 30 RPM packages (almost 120MB), which contain the server, along with support and development libraries, fonts, various clients, and documentation. An additional 1,000 or more X clients, fonts, and documentation are also included with Fedora.
A full installation of X and related X.Org 7.3 files can consume more — usually much more — than 170MB of hard drive space. This happens because additional clients, configuration files, and graphics (such as icons) are under the /usr/bin and /usr/share directory trees. You can pare excessive disk requirements by judiciously choosing which X-related packages (such as games) to install on workstations. However, with the increased capacity of most desktop PC hard drives today, the size requirements are rarely a problem, except in configuring thin-client desktops or embedded systems.
The /usr directory and its subdirectories contain the majority of Xorg's software. Some important subdirectories are
> /usr/bin — This is the location of the X server and various X clients. (Note that not all X clients require active X sessions.)
> /usr/include — This is the path to the files necessary for developing X clients and graphics such as icons.
> /usr/lib — This directory contains required software libraries to support the X server and clients.
> /usr/lib/X11 — This directory contains fonts, default client resources, system resources, documentation, and other files that are used during X sessions and for various X clients. You can also find a symbolic link to this directory, named X11, under the /usr/lib directory.
> /usr/lib/modules — This path to drivers and the X server modules used by the X server enables use of various graphics cards.
The main components required for an active local X session are installed on your system if you choose to use a graphical desktop. These components are the X server, miscellaneous fonts, a
Elements of the xorg.conf File
