#!/bin/sh

# Copyright 2012-2019 Edward W. Koenig, Vancouver, WA, USA
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# nvidia-switch utility 4.0
#
# A tool to install and cleanly remove the nvidia driver without stomping on the xorg files.
# Note: this tool "should" allow switching on the fly, but why? Pick a driver! You will still
# need to edit a bunch of other config files.

# TO-DO: needs more cleanup, simplify linking using system tools

ROOT="${ROOT:-/}"
CWD=$(pwd)
COMPAT32="LIB32FLAG" # This will be replaced in the build script (yes | no)
LIBSUFFIX="LIBDIRSUFFIX" # This will be replaced in the build script
INC="${ROOT}usr/include/GL"
LIB="${ROOT}usr/lib${LIBSUFFIX}"
LIB32="${ROOT}usr/lib"
XMOD="${LIB}/xorg/modules"
XLIB="$XMOD/extensions"
NV_VERSION="PKGVERSION" # This will be replaced in the build script
GL_VERSION="1.2.0"
GLVND="GLVNDFLAG" # This will be replaced in the build script (yes | no)
NV_CONF="${ROOT}usr/share/X11/xorg.conf.d/10-nvidia.conf"
SAVELIBS="${ROOT}var/log/nvidia"

save_GL(){
# backup original mesa and xorg conflicts to /var/log/nvidia
  cd $2
  # Need to make sure save path is reset incase of multilib
  SAVELIBS="${ROOT}var/log/nvidia"
  if [ "$2" = "$LIB32" ]; then
     SAVELIBS="${SAVELIBS}/32"
  elif [ "$2" = "$LIB" ]; then
     SAVELIBS="${SAVELIBS}/64"
  fi

  case "$1" in
    "nvidia")

      mv libGL.so.$GL_VERSION $SAVELIBS/libGL.so.$GL_VERSION
      mv libEGL.so.1.0.0 $SAVELIBS/libEGL.so.1.0.0
      mv libGLESv1_CM.so.1.1.0 $SAVELIBS/libGLESv1_CM.so.1.1.0
      mv libGLESv2.so.2.0.0 $SAVELIBS/libGLESv2.so.2.0.0

      if [ "$GLVND" = "yes" ]; then
        ln -sf libGL.so.1.7.0 libGL.so.1
	ln -sf libGL.so.1.7.0 libGL.so
        ln -sf libEGL.so.1.1.0-nvidia libEGL.so.1.1.0
	ln -sf libEGL.so.1.1.0-nvidia libEGL.so
      else
        ln -sf libGL.so.$NV_VERSION libGL.so.1
        ln -sf libGL.so.$NV_VERSION libGL.so
        ln -sf libEGL.so.$NV_VERSION libEGL.so.1
        ln -sf libEGL.so.$NV_VERSION libEGL.so
      fi

      ln -sf libGLESv1_CM.so.1.2.0-nvidia libGLESv1_CM.so.1.2.0
      ln -sf libGLESv1_CM.so.1.2.0-nvidia libGLESv1_CM.so.1
      ln -sf libGLESv1_CM.so.1.2.0-nvidia libGLESv1_CM.so

      ln -sf libGLESv2.so.2.1.0-nvidia libGLESv2.so.2.1.0
      ln -sf libGLESv2.so.2.1.0-nvidia libGLESv2.so.2
      ln -sf libGLESv2.so.2.1.0-nvidia libGLESv2.so
    ;;

    "xorg")
       mv $SAVELIBS/libGL.so.$GL_VERSION libGL.so.$GL_VERSION
       mv $SAVELIBS/libEGL.so.1.0.0 libEGL.so.1.0.0
       mv $SAVELIBS/libGLESv1_CM.so.1.1.0 libGLESv1_CM.so.1.1.0
       mv $SAVELIBS/libGLESv2.so.2.0.0 libGLESv2.so.2.0.0

       ln -sf libGL.so.$GL_VERSION libGL.so.1
       ln -sf libGL.so.$GL_VERSION libGL.so
       ln -sf libEGL.so.1.0.0 libEGL.so.1
       ln -sf libEGL.so.1.0.0 libEGL.so
       rm -f libEGL.so.1.1.0

       ln -sf libGLESv1_CM.so.1.1.0 libGLESv1_CM.so.1
       ln -sf libGLESv1_CM.so.1.1.0 libGLESv1_CM.so
       ln -sf libGLESv2.so.2.0.0 libGLESv2.so.2
       ln -sf libGLESv2.so.2.0.0 libGLESv2.so
       rm -f libGLESv1_CM.so.1.2.0
       rm -f libGLESv2.so.2.1.0
  ;;

  *)
        echo "nothing to do for save_gl?"
        exit 1
  ;;
  esac
  cd "$CWD"
}

save_glx(){
  cd "$XLIB"
  case "$1" in
      "nvidia")
        if [ -e libglx.so ]; then
          mv libglx.so xorg-libglx.so
        fi
	  ln -sf libglxserver_nvidia.so.$NV_VERSION libglx.so
      ;;
      "xorg")
        if [ -e xorg-libglx.so ]; then
          rm -f libglx.so
          mv xorg-libglx.so libglx.so
        else
          rm -f libglx.so
        fi
      ;;
        *)
          echo "nothing to do for save_glx?"
          exit 1
      ;;
  esac
  cd "$CWD"
}

save_wfb(){
  cd "$XMOD"
  if [ -e libwfb.so ]; then
    echo "Using existing Xorg libwfb..."
  else
    if [ "$1" = "nvidia" ]; then
	ln -sf libwfb.so.$NV_VERSION libwfb.so.1
	ln -sf libwfb.so.1 libwfb.so
    fi
    if [ "$1" = "xorg" ]; then
	rm -f libwfb.so
	rm -f libwfb.so.1
    fi
  fi
  cd "$CWD"
}

nvidia_install(){
  if [ ! -d $SAVELIBS ]; then
     echo "Creating missing $SAVELIB ..."
     mkdir -p $SAVELIBS
  fi
  echo $'Installing to nvidia-driver files!\n'
  echo "Make sure the nvidia driver is ENABLED in /etc/X11/xorg.conf"
  echo "and in /etc/X11/xorg.conf.d."
  echo "Otherwise, this may lead to improperly working drivers."

  save_glx "nvidia"
  save_GL "nvidia" $LIB
  save_wfb "nvidia"
# Check for multilib configuration
  if [ "$COMPAT32" = "yes" ]; then
    save_GL "nvidia" $LIB32
  fi
}

nvidia_remove(){
  echo $'Returning to stock xorg files!\n'
  echo "Make sure the nvidia driver is DISABLED in /usr/share/X11/xorg.conf.d"
  echo "/etc/X11/xorg.conf and in /etc/X11/xorg.conf.d."
  echo "Otherwise, this may lead to improperly working drivers."

  save_glx "xorg"
  save_GL "xorg" $LIB
  save_wfb "xorg"

# Check for multilib configuration
  if [ "$COMPAT32" = "yes" ]; then
    save_GL "xorg" $LIB32
  fi

  if [ -e $NV_CONF ]; then
    echo "removing $NV_CONF: you will need to provide your own"
    echo "or reinstall nvidia-driver."
    rm -f $NV_CONF
  fi
}

restore(){
# Attempt to reinstall damaged stock packages if something went wrong.
# Obviously, you will need to run this after '--remove' and after
# 'removepkg nvidia-driver'.
# User must:
# 1. remove any dangling symlinks and xorg-*, *-nvidia files in /usr/lib*/,
#    and any other housekeeping tasks.
# 2. copy stock Slackware packages to /root/Slackware or provide an alternate location
# 3. be running Slackware-14.2, not current
# 4. realize that COMPAT32 is not stable ;-)

if [ "$LIBSUFFIX" = "64" ]; then
  ARCH="x86_64"
else
  ARCH="x86"
fi

PKGPATH=${PKGPATH:-/root/Slackware}
MESA="mesa-11.2.2-$ARCH-1.txz"
MESA32="mesa-compat32-11.2.2-$ARCH-1compat32.txz"
XORG="xorg-server-1.18.3-$ARCH-5.txz"
# Note: The above is for stock 14.2; modify as needed for /patches or
# multilib updates
if [ -d $PKGPATH ]; then
  if [ `find $PKGPATH -prune -empty -type d` ]; then
    echo "Your $PKGPATH is empty!"
  else
    upgradepkg --reinstall --install-new $MESA $XORG
    if [ "COMPAT32" = "yes" ]; then
      upgradepkg --reinstall --install-new $MESA32
    fi
  fi
else
  echo "Please create $PKGPATH containing the appropriate packages"
fi
}

usage(){
  echo "Usage:"
  echo " --install    Set up nvidia driver files"
  echo " --remove     Return to stock xorg files and restore all symlinks"
  echo " --restore    Reinstall stock Mesa and xorg-server [EXPERIMENTAL]"
  echo "              mesa-11.2.2, org-server-1.18.3, and optionally"
  echo "              mesa-compat32-11.2.2 are expected in /root/Slackware"
  echo "              Use 'PKGPATH=\"<location>\" nvidia-switch --restore'"
  echo "              to override."
  echo " --help	      Show this help message"
}

case "$1" in
  "--install")
    nvidia_install
    ;;
  "--remove")
    nvidia_remove
    ;;
  "--restore")
    restore
    ;;
  "--help")
    usage
    ;;
  *)
    usage
    ;;
esac