Review Request: Build kwin and kwin_gles binary

[Martin Gräßlin]

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http://git.reviewboard.kde.org/r/101979/
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Review request for kwin, Plasma and Alexander Neundorf.


Summary
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Major build system change: everything is compiled twice, once with OpenGL (if present) and once with OpenGL ES (if present). To better support this kwinglutils becomes an own library and is splitted out of the kwineffects library. It is build once as kwinglutils and once as kwinglesutils.

The effects are built twice into a kwin4_effect_builtins and kwin4_effect_gles_builtin. And last but not least we build a kwin and a kwin_gles.

The last part I consider as a temporary solution till Arthur finished the part of making scene* completely independent from kwin core. When that is done I want to only compile the compositor twice and load it as a plugin depending on the result of an external test program (so that NVIDIA users cannot get trying to load the non working GLES).

The change to compile everything twice is for the following reasons:

1. Should make life easier for distributions to provide kwin_gles

2. To have the Wayland support only in kwin_gles (does not make sense in kwin+desktop GL)

3. To make testing easier by just starting kwin --replace and kwin_gles --replace


Current issues and things I want to do:

* kwineffects still links libGL as it provides a check whether GLX is available. I think this one can be dropped (should only be used at one place in scene)

* Add another marco to ensure that kwin+gl cannot load GLES effects and vice versa

* Clean up the build files

* think about whether we need XRender when building the gles backend


@Alex: it would be nice if you could have a look at the changes and if they look fine.

@Plasma: Please have a look whether there is something useful for Plasma Active - the patches should (mostly) apply to 4.7


Diffs
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  kwin/libkwineffects/kwinconfig.h.cmake 22405a5 
  kwin/effects.cpp 143b033 
  kwin/effects/CMakeLists.txt 8683b35 
  kwin/effects/logout/logout.cpp d0a5c1d 
  kwin/effects/showfps/showfps.h 8834956 
  kwin/effects/showfps/showfps_config.h b184622 
  kwin/effects/showfps/showfps_config.cpp dcbe93b 
  kwin/kcmkwin/kwincompositing/CMakeLists.txt 57d7750 
  kwin/kcmkwin/kwinscreenedges/CMakeLists.txt 94e841c 
  kwin/libkwineffects/CMakeLists.txt cb9703b 
  kwin/CMakeLists.txt 4859978 

Diff: http://git.reviewboard.kde.org/r/101979/diff


Testing
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* kwin works with OpenGL and only loads the desktop GL effects
* kwin_gles works with OpenGL ES and only loads the GLES effects


Thanks,

Martin

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