nixpkgs/pkgs/build-support/opengl/mesa-switch.sh
Eelco Dolstra 410f21887a * A quick hack to get accelerated OpenGL working: just use the driver
in /usr/lib/libGL.so.1 (which will typically load a driver in
  /usr/X11R6/lib/modules/dri).  This has been tested on a i915
  graphics card; it should work with most open source X.org drivers.
  For NVidia's proprietary drivers (which we cannot build ourselves
  anyway), some more symlinks are necessary; I'll add those later.

  So to get hardware-accelerated Quake 3, do:

  $ nix-env -p /nix/var/nix/profiles/opengl -i xorg-sys-opengl
  $ nix-env -i quake3-demo
  $ quake3

svn path=/nixpkgs/trunk/; revision=4613
2006-01-28 01:13:31 +00:00

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profileName=opengl
profileDir=/nix/var/nix/profiles
profile=$profileDir/$profileName
if test -z "$OPENGL_DRIVER"; then
if test -d "$profile/lib"; then
OPENGL_DRIVER=$profile
fi
fi
if test -z "$OPENGL_DRIVER"; then
cat <<EOF
======================================================================
This program uses OpenGL for 3D graphics. For best performance, you
should use a hardware-accelerated implementation of OpenGL. Since you
have not enabled one, a software implementation (Mesa) will be used.
This will probably be quite slow.
This program will look for a hardware-accelerated implementation of
OpenGL in the "$profileName" profile of your Nix installation. For
instance, to enable the (hopefully) accelerated driver provided by
your (non-NixOS) Linux distribution, try
$ nix-env -p $profile -i xorg-sys-opengl
Alternatively, you can set the OPENGL_DRIVER environment variable to
point at the package containing the OpenGL implementation.
======================================================================
EOF
OPENGL_DRIVER=$mesa
fi
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH${LD_LIBRARY_PATH:+:}$OPENGL_DRIVER/lib
hook="$OPENGL_DRIVER/nix-support/opengl-hook"
if test -e "$hook"; then
source "$hook"
fi