#!/bin/bash

# Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020  Patrick J. Volkerding, Sebeka, MN, 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.

cd $(dirname $0) ; CWD=$(pwd)

PKGNAM=mesa
VERSION=${VERSION:-$(echo $PKGNAM-[0-9]*.tar.?z | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
DEMOVERS=${DEMOVERS:-8.4.0}
BUILD=${BUILD:-1}
BUILD_DEMOS=${BUILD_DEMOS:-YES}

NUMJOBS=${NUMJOBS:-" -j$(expr $(nproc) + 1) "}

# Be sure this list is up-to-date:
DRI_DRIVERS="i915,i965,r100,r200,nouveau"
GALLIUM_DRIVERS="nouveau,r300,r600,svga,radeonsi,swrast,virgl,iris"

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) export ARCH=i586 ;;
    arm*) export ARCH=arm ;;
       *) export ARCH=$( uname -m ) ;;
  esac
fi

# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
# the name of the created package would be, and then exit. This information
# could be useful to other scripts.
if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PKGNAM-$VERSION-$ARCH-$BUILD.txz"
  exit 0
fi

# Build swr for the following architectures (not for i?x6, as this will cause
# an Illegal Instruction startup failure on many otherwise supported CPUs):
for swr_arch in x86_64 ; do
  if [ "$ARCH" = "x86_64" ]; then
    GALLIUM_DRIVERS="$GALLIUM_DRIVERS,swr"
  fi
done

TMP=${TMP:-/tmp}
PKG=$TMP/package-mesa

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

rm -rf $PKG
mkdir -p $TMP $PKG
cd $TMP
rm -rf ${PKGNAM}-${VERSION}

tar xvf $CWD/${PKGNAM}-${VERSION}.tar.?z || exit 1
cd ${PKGNAM}-$VERSION || exit 1

# Let's kill the warning about operating on a dangling symlink:
rm -f src/gallium/state_trackers/d3d1x/w32api

# Make sure ownerships and permissions are sane:
chown -R root:root .
find . \
  \( -perm 777 -o -perm 775 -o -perm 711 -o -perm 555 -o -perm 511 \) \
  -exec chmod 755 {} \+ -o \
  \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
  -exec chmod 644 {} \+

# Apply patches from git (and maybe elsewhere):
# Patches obtained by:
#   git checkout origin/17.2
#   git format-patch 93c2beafc0a7fa2f210b006d22aba61caa71f773 # 17.2.6 release
if /bin/ls $CWD/patches/*.patch 1> /dev/null 2> /dev/null ; then
  for patch in $CWD/patches/*.patch ; do
    patch -p1 --verbose < $patch || exit 1 ;
  done
fi

# Configure, build, and install:
export CFLAGS="$SLKCFLAGS"
export CXXFLAGS="$SLKCFLAGS"
mkdir meson-build
cd meson-build
meson setup \
  --prefix=/usr \
  --libdir=lib${LIBDIRSUFFIX} \
  --libexecdir=/usr/libexec \
  --bindir=/usr/bin \
  --sbindir=/usr/sbin \
  --includedir=/usr/include \
  --datadir=/usr/share \
  --mandir=/usr/man \
  --sysconfdir=/etc \
  --localstatedir=/var \
  --buildtype=release \
  -Dplatforms=x11,wayland \
  -Dgallium-opencl=icd \
  -Dgallium-nine=true \
  -Dosmesa=gallium \
  -Ddri-drivers=$DRI_DRIVERS \
  -Dgallium-drivers=$GALLIUM_DRIVERS \
  -Dglvnd=true \
  -Dllvm=enabled \
  -Dshared-llvm=enabled \
  -Dshared-glapi=enabled \
  -Degl=enabled \
  -Dgles1=enabled \
  -Dgles2=enabled \
  .. || exit 1
  "${NINJA:=ninja}" $NUMJOBS || exit 1
  DESTDIR=$PKG $NINJA install || exit 1
cd ..

# Install /etc/drirc as a .new file:
if [ -r $PKG/etc/drirc ]; then
  mv $PKG/etc/drirc $PKG/etc/drirc.new
fi

if [ "$BUILD_DEMOS" = "YES" ]; then
  # Now build/install a small subset of the demos:
  export CWD SLKCFLAGS NUMJOBS PKG
  ( cd $TMP
    rm -rf mesa-demos-$DEMOVERS
    tar xvf $CWD/mesa-demos-$DEMOVERS.tar.?z* || exit 1
    cd mesa-demos-$DEMOVERS
    chown -R root:root .
    find . \
      \( -perm 777 -o -perm 775 -o -perm 711 -o -perm 555 -o -perm 511 \) \
      -exec chmod 755 {} \+ -o \
    \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
      -exec chmod 644 {} \+
    CFLAGS="$SLKCFLAGS" \
    ./configure \
      --prefix=/usr \
      --build=$ARCH-slackware-linux || exit 1
    make $NUMJOBS || exit 1
    # Install all the demos (including the pointless ones) at first, in a
    # temporary location:
    make install DESTDIR=$PKG/cruft || exit 1
    # Install gears and glinfo, as well as a few other demos:
    mkdir -p $PKG/usr/bin
    for demo in gears glinfo glthreads glxcontexts glxdemo glxgears \
      glxgears_fbconfig glxheads glxinfo glxpbdemo glxpixmap ; do
      mv --verbose $PKG/cruft/usr/bin/$demo $PKG/usr/bin
  done
    # Remove cruft:
    rm -rf $PKG/cruft
  ) || exit 1
fi

# Strip binaries:
find $PKG | xargs file | grep -e "executable" -e "shared object" | grep ELF \
  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null

find $PKG/usr/man -type f -exec gzip -9 {} \+
for i in $( find $PKG/usr/man -type l ) ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done

# Compress info files, if any:
if [ -d $PKG/usr/info ]; then
  rm -f $PKG/usr/info/dir
  gzip -9 $PKG/usr/info/*
fi

mkdir -p $PKG/usr/doc/$PKGNAM-$VERSION/html
cp -a \
  docs/COPYING* docs/relnotes/${VERSION}.html docs/README* docs/GL* \
  $PKG/usr/doc/$PKGNAM-$VERSION
cp -a docs/*.html $PKG/usr/doc/$PKGNAM-$VERSION/html
rm -f $PKG/usr/doc/$PKGNAM-$VERSION/html/relnotes*.html

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc
zcat $CWD/doinst.sh.gz > $PKG/install/doinst.sh

cd $PKG
/sbin/makepkg -l y -c n $TMP/${PKGNAM}-$VERSION-$ARCH-$BUILD.txz