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# Glucose
In the spirit of being short and sweet, that fits very well with the concepts of Glucose:
* it's an OpenGL based acceleration architecture (as XAA and EXA);
* it uses [[Software/Xgl|Software/Xgl]] code, so it accelerates everything using exactly the same paths as [[Software/Xgl|Software/Xgl]] does, so there's no duplicate code/work;
* all driver code is limited to just initialising it (a call to _glucoseDriverInit_).
## Known issues
* Xorg will crash if the number of clients reaches zero.
* Changes to the screen geometry via RandR extension are not yet supported.
## Source
Source is only available from Git and for Intel cards. You need to follow the [[instructions to build a modular Xorg|http://www.x.org/wiki/ModularDevelopersGuide]], but using instead:
* _yuv-porting_ branch from _pixman_ module,
* _master_ of [[Software/glitz|Software/glitz]] module,
* _glucose-2_ branch from _xserver_ module,
* _glucose_ branch from _xf86-video-intel_ module.
Then add the following line to the _Device_ section of you _xorg.conf_:
[[!format txt """
Option "AccelMethod" "glucose"
"""]]
## Troubleshooting
If things are slow check on the resulting _/var/log/Xorg.0.log_ for the following (or similar) lines:
[[!format txt """
...
AIGLX: Loaded and initialized /usr/lib/dri/i915_dri.so
...
intel(0): Using GLUCOSE for acceleration
...
"""]]
If either is missing then you're either using glucose with GL software rendering, or no glucose at all.
## Links
* [[Initial annoucement|http://lists.freedesktop.org/archives/xorg/2006-August/017393.html]]
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