Difference between pages "Package:Eselect (OpenGL)" and "Repository:Bliss Overlay"

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{{Ebuild
{{Repository
|Summary=A Gentoo/Funtoo utility that allows the active OpenGL implementation on a system to be switched between a variety of installed options.
|Repository ID=bliss-overlay
|CatPkg=app-admin/eselect-opengl
|Repository Type=Development Tree
|Maintainer=
|Maintainer=Fearedbliss,
|Organization=
|Homepage=https://github.com/fearedbliss/bliss-overlay.git
|Source URI=https://github.com/fearedbliss/bliss-overlay.git
}}
}}
== Introduction ==


Eselect (OpenGL) (also called <tt>eselect-opengl</tt>) is a module for [[Package:Eselect|Eselect]] that allows the OpenGL implementation on a Funtoo Linux or Gentoo Linux system to be switched between a variety of installed OpenGL implementations. It functions by creating an <tt>env.d</tt> file at <tt>/etc/env.d/03opengl</tt> which contains OpenGL settings, as well as managing symbolic links to OpenGL libraries and headers.
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=== Sample env.d File ===
 
A sample <tt>env.d</tt> file for a multilib system with xorg-x11 OpenGL implementation may look like this:
 
{{file|name=/etc/env.d/03opengl|desc=An example env.d file for eselect-opengl|body=
# Configuration file for eselect
# This file has been automatically generated.
LDPATH="/usr/lib32/opengl/xorg-x11/lib:/usr/lib64/opengl/xorg-x11/lib"
OPENGL_PROFILE="xorg-x11"
}}
 
== Implementation ==
 
Eselect-opengl is implemented as a single bash-based [[Package:Eselect|Eselect]] module approximately 10K in size, installed at <tt>/usr/share/eselect/modules/opengl.eselect</tt>. One interfaces with this module via the main <tt>eselect</tt> command:
 
<console>
# ##i##eselect opengl help
Manage the OpenGL implementation used by your system
Usage: eselect opengl <action> <options>
 
##g##Standard actions:
  help                      Display help text
  usage                    Display usage information
  version                  Display version information
 
##g##Extra actions:
  list                      List the available OpenGL implementations.
  set <target>              Select the OpenGL implementation.
    <target>                  The profile to activate
    --use-old                If an implementation is already set, use that one instead
    --prefix=<val>            Set the source prefix (default: /usr)
    --dst-prefix=<val>        Set the destination prefix (default: /usr)
    --ignore-missing          Ignore missing files when setting a new implementation
  show                      Print the current OpenGL implementation.
</console>
 
== What is Switched ==
 
Using <tt>eselect opengl set</tt> causes the following symbolic links to be updated to point to the files corresponding to the OpenGL implementation that you chose:
 
* ''Libraries'' (32-bit and 64-bit):
** <tt>/usr/lib(64)/libGL.so.*</tt>
** <tt>/usr/lib(64)/libEGL.so.*</tt>
** <tt>/usr/lib/(32|64|)/libGLESv1.so.*</tt>
** <tt>/usr/lib/(32|64|)/libGLESv2.so.*</tt>
* ''C Headers'':
** <tt>/usr/include/GL/*</tt>
** <tt>/usr/include/EGL/*</tt>
** <tt>/usr/include/KHR/*</tt>
* <tt>/usr/lib(64|)/xorg/modules/extensions/libglx.so</tt>
 
The symbolic links point to an installed OpenGL implementation, stored inside <tt>/usr/lib(32|64|)/opengl/(implementation-name)</tt>. These files are structured as follows:
 
* <tt>/usr/lib/opengl/(implementation-name)/lib</tt>
* <tt>/usr/lib/opengl/(implementation-name)/include/(GL|EGL|KHR)</tt>
* <tt>/usr/lib/opengl/(implementation-name)/extensions/libglx.so</tt>
 
On multilib systems, ebuilds that provide an OpenGL implementation install 32-bit libraries in <tt>/usr/lib32/opengl/(implementation name)/lib</tt> and 64-bit libraries in <tt>/usr/lib64/opengl/(implementation name)/lib</tt>.
 
== Criticisms ==
 
=== Violation of Build Consistency ===
 
As documented in {{Bug|FL-1309}}, sometimes packages fail to merge when the "wrong" eselect opengl implementation is selected. This violates Portage's ability to consistently build a package from source, assuming all its dependencies are satisfied. This could be classified as a design bug -- eselect-opengl is functioning as intended, but its underlying theory of operation is not correct.
 
===== Possible Solutions =====
 
A possible solution to this problem, discussed in {{Bug|FL-1309}}, is to redesign eselect-opengl to only select the ''runtime'' OpenGL implementation, but to have all ebuilds build against the official xorg-x11 OpenGL implementation.
 
The rationale for this design change is that:
# There should be a consistent and repeatable build/linking process for all OpenGL applications.
# AMD and NVIDIA implementations of OpenGL are designed to be more of a "drop-in" runtime replacement for xorg-x11, rather than a standalone replacement for xorg-x11, and thus appear to exhibit more build-time bugs.
 
 
 
 
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Latest revision as of 03:49, June 29, 2014

Repository Type:Development Tree
Repository ID:bliss-overlay
Current Maintainer(s):
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Bliss Overlay

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