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Introduzione

Xgl e AiGlx sono entrambi software ancora in fase di sviluppo e quindi non dovrebbero essere usati su macchine di produzione. Hanno bug e non sempre vanno d'accordo con gli altri programmi. Siete stati avvertiti.

Di recente, ci sono stati molti interessi riguardo l'accellerazione 3D dei composite manager sui server X. Ciò è comunemente riferito a Xgl o a Compiz, sebbene entrambi i pacchetti sono solo un mezzo per ottenere un destkop 3D (e possono essere sostituiti).

Ci sono due passaggi coinvolti nell'installazione di un accellerazione 3D di un composite manager:

1. Installazione di un server X che lo sostiene.
2. Installazione del composite manager in sè.

Altre istruzioni, per ognuno di questi, sono reperibili più giù.

Server X

I composite manager richiedono un server X capace di mettere a disposizione l'accellerazione 3D per i Window Manager. Ci sono attualmente due opzioni che riescono a realizzare ciò:

1. [https://help.ubuntu.com/community/CompositeManager/Xgl CompositeManager/Xgl] which runs on top of a separate Xorg server. More information about it [http://www.novell.com/linux/xglrelease/ here]

2. [https://help.ubuntu.com/community/CompositeManager/AIGLX CompositeManager/AIGLX], which runs as part of Xorg. More information about it [http://fedoraproject.org/wiki/RenderingProject/aiglx here]

XGL is a temporary solution that adds support for indirect 3d rendering to any video card.

AIGLX is the long-term solution, but it requires that your video card driver include an additional extension.

Composite Manager

When running AIGLX or Xgl, all windows are rendered to an off-screen buffer. The composite manager is then responsible for drawing the windows to the screen, and has the opportunity to manipulate them, adding in cool effects such as transparency and wobbliness.

There are currently two composite managers available.

• [https://help.ubuntu.com/community/CompositeManager/Compiz CompositeManager/Compiz] - A combination window manager and composite manager from Novell.

• [https://help.ubuntu.com/community/CompositeManager/Beryl CompositeManager/Beryl] - A fork of Compiz that adds some additional features. It is generally much less stable than Compiz.

Known Issues & Troubleshooting

Some applications won't start or are displayed incorrectly

Some applications do not function properly when run along side a composite manager. If after enabling a composite manager you encounter an application that stops working entirely, or is displayed incorrectly (often with unwanted transparency), please [https://help.ubuntu.com/community/ReportingBugs file a bug].

In some cases, you can work around the problem by temporarily disabling alpha visuals for the application, by launching it from the terminal as such:

XLIB_SKIP_ARGB_VISUALS=1 nedit

Replace 'nedit' with the name of the application you are having issues with.

Further reading

• [http://forum.beryl-project.org/ Beryl Forums & Community] - This is generally a good resource.

• [http://en.opensuse.org/CompizOpenSuse Compiz]

• [http://en.opensuse.org/XglOpenSuse Xgl]

• [http://en.wikipedia.org/wiki/Xgl Wikipedia Xgl]

• [http://www.freedesktop.org/wiki/Software/Xgl Freedesktop Xgl]

• [http://fedoraproject.org/wiki/RenderingProject/aiglx Fedora AIGLX]

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