Difference between revisions of "KWin/Environment Variables"

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(KWIN_COMPOSE)
(KWIN_DIRECT_GL)
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== KWIN_DIRECT_GL ==
 
== KWIN_DIRECT_GL ==
 
KWin determines whether '''LIBGL_ALWAYS_INDIRECT''' has to be set by an external helper application and a driver whitelist of the drivers known to perform well with direct rendering. By setting the environment variable '''KWIN_DIRECT_GL''' to ''1'' the checks are not performed and '''LIBGL_ALWAYS_INDIRECT''' is not set.
 
KWin determines whether '''LIBGL_ALWAYS_INDIRECT''' has to be set by an external helper application and a driver whitelist of the drivers known to perform well with direct rendering. By setting the environment variable '''KWIN_DIRECT_GL''' to ''1'' the checks are not performed and '''LIBGL_ALWAYS_INDIRECT''' is not set.
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This environment variable is only supported in 4.x.
  
 
== KWIN_GL_DEBUG ==
 
== KWIN_GL_DEBUG ==

Revision as of 14:00, 5 November 2013

Available Environment Variables

KWin supports a number of environment variables to overwrite some settings or checks. The following variables are supported:

KWIN_COMPOSE

The environment variable KWIN_COMPOSE enforces a compositing backend or forces compositing completely off. The following values are supported:

  • O: OpenGL backend (either OpenGL 1, OpenGL 2 or OpenGL ES 2.0)
  • O1: OpenGL 1 backend
  • O2: OpenGL 2 backend
  • X: XRender backend
  • N: No Compositing

KWIN_NVIDIA_HACK

By default KWin uses an NVIDIA specific hack to set __GL_YIELD to NOTHING. By setting "KWIN_NVIDIA_HACK" to "0" this behavior can be disabled.

KWIN_DIRECT_GL

KWin determines whether LIBGL_ALWAYS_INDIRECT has to be set by an external helper application and a driver whitelist of the drivers known to perform well with direct rendering. By setting the environment variable KWIN_DIRECT_GL to 1 the checks are not performed and LIBGL_ALWAYS_INDIRECT is not set.

This environment variable is only supported in 4.x.

KWIN_GL_DEBUG

By setting KWIN_GL_DEBUG to 1 the OpenGL rendering can be debugged visually. All geometries which are rendered are overlayed by a wireframe. The wireframe is not available in OpenGL ES 2.0. The environment variable is supported since 4.7.

KWIN_FORCE_LANCZOS

The lanczos filter is controlled by the scale method in the advanced compositing settings and a blacklist of drivers known to break with this filter. The setting and the blacklist can be overruled by setting KWIN_FORCE_LANCZOS to 1. This environment variable is supported since 4.8.

KWIN_OPENGL_INTERFACE

By setting KWIN_OPENGL_INTERFACE to egl the OpenGL based compositor uses the EGL platform interface instead of the GLX. This environment variable is supported since 4.10.


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