Drop COMPOSITE_HOWTO
Nowadays compositing just works, we do not need a howto anymore and it's outdated anyway.
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Martin Gräßlin
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COMPOSITE_HOWTO
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COMPOSITE_HOWTO
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This file describes how to set up kwin_composite. Note that since it is still
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a work in progress, this file may possibly get out of date at times.
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See file HACKING for details on developing KWin, including building
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the kwin_composite branch.
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See file COMPOSITE_TODO for a list of things that still need to be done.
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See effects/howto.* for a HOWTO on writting effects.
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See documentation in source (mainly in scene.cpp) for description
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of the design of the compositing framework.
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After starting, KWin's debug output also says which compositing backend it uses, e.g.
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"OpenGL compositing". If it does not, most probably your X is not configured properly.
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nVidia:
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===========
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8xxx drivers and newer work, only 9xxx and later drivers provide TFP (texture_from_pixmap)
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functionality.
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You need in xorg.conf (add to existing sections if they already exist)
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Section "Screen"
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Option "AddARGBGLXVisuals" "True"
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EndSection
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and also the XComposite extension enabled:
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Section "Extensions"
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Option "Composite" "Enable"
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EndSection
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Issues:
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-------
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When switching away from the X session KWin freezes in nvidia's OpenGL library
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- turn off GLVSync option (see below)
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- fixed with 100.14.23 drivers
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TFP mode (see GLMode below) doesn't work with windows with certain sizes (32x32)
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- already fixed in latest drivers
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Refresh rate is slower than it should be
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- nvidia drivers use refresh rate to work around some X limitations
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- disable DynamicTwinView (see nvidia README)
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- should(?) be fixed with drivers updated for xrandr1.2
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AddARGBGLXVisuals option seems to work only with depth 24
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- change your xorg.conf to use depth 24 (or use a configuration tool)
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Xinerama works only when using TwinView, the Xinerama implementation provided by X.Org prevents compositing
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check your X log (/var/log/X*.log) for warnings and errors if there are other problems
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Intel:
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=======
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It should work with both the i810 and intel drivers.
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You need in xorg.conf the XComposite extension enabled
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(add to existing sections if they already exist):
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Section "Extensions"
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Option "Composite" "Enable"
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EndSection
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Also in xorg.conf, you need the DRI module loaded, and AIGLX needs to be enabled:
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Section "Module"
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Load "dri"
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EndSection
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Section "ServerFlags"
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Option "AIGLX"
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EndSection
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DRI also needs some options in xorg.conf (they should be there by default):
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Section "DRI"
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Group "video"
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Mode 0660
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EndSection
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For SHM, the following in xorg.conf may improve performance:
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Section "Screen"
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Option "XaaNoOffscreenPixmaps" "true"
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EndSection
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Issues:
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-------
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With the i810 driver, DRI works only on the first running X (if you use secondary X session,
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compositing won't work there), the intel driver doesn't seem to have this problem.
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You may get only white rectangles if DRI is not enabled or fails to initialize
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- check your X log (/var/log/X*.log) and your xorg.conf
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Window contents updating may not work properly in secondary X session (likely X/driver bug)
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Xinerama does not work with the Xinerama implementation in X.Org
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- you need to use solutions like MergedFB
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check your X log (/var/log/X*.log) for warnings and errors if there are other problems
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ATI:
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========
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The radeon driver should work for R200 chips, it's worse with R300 chips.
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The fglrx driver requires XGL for versions older than 8.42.3.
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Refer to the Intel section, setting up should be similar.
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Configuration options:
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======================
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There is configuration module for most options. If you need to manually disable compositing,
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use the following command:
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kwriteconfig --file kwinrc --group Compositing --key Enabled --type bool false
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ShowFPSEffect:
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Options are in group [EffectShowFps] in kwinrc config file:
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Alpha=<number 0.0-1.0> - transparency
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X=<number> - X position, negative is from the right edge, -10000 is exactly right edge
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Y=<number> = Y position, the same like X
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Effects:
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========
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Effects can be enabled/disabled in KConfig module accessible by right-clicking
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on a window title, choosing "Configure Window Behaviour" and then
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"Window Effects".
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