98 lines
3.1 KiB
Text
98 lines
3.1 KiB
Text
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a work in progress, this file may possibly get out of date at times.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
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Option "AddARGBGLXVisuals" "True"
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in 'Section "Screen"' 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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TFP mode (see GLMode) below crashes with windows with certain sizes (32x32)
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- use SHM mode
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- already fixed in development version of 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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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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TODO - fglrx - no idea
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You need in xorg.conf 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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Also using
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Option "XaaNoOffscreenPixmaps" "true"
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in 'Section "Screen"' may improve performance for non-TFP (texture_from_pixmap) modes.
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For the TFP mode AIGLX needs to work. With AIGLX direct rendering should be be disabled
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(see GLDirect below, with X.org older than 7.2 "export LIBGL_ALWAYS_INDIRECT=1" before
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running kwin may be necessary).
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Intel:
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=======
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TODO - no idea. Possibly similar to ATI.
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Configuration options:
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======================
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All general configuration option are in group [Translucency] in kwinrc config file:
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UseTranslucency=<true|false> - enables/disables compositing support
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GLMode=<TFP|SHM|Fallback> - selects texture creating mode
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RefreshRate=<number> - manually specified refresh rate, should be usually automatically detected
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GLAlwaysRebind=<true|false> - may increase speed with some graphics cards
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GLDirect=<true|false> - enables/disables direct rendering
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GLVSync=<true|false> - enables/disables synchronizing with monitor refresh
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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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Which modules are enabled is currently set by config value Load in group [Effects] in kwinrc config file.
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Effects are named like the class, without the Effect suffix (e.g. Load=ShowFps,Fade). There is
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no depedency checking implemented yet.
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