#!/bin/sh

# Slackware build script for snes9x

# Written by B. Watson (yalhcru@gmail.com)

# Licensed under the WTFPL. See http://www.wtfpl.net/txt/copying/ for details.

# 20181201 bkw:
# - update for 1.57.
# - disable OSS audio by default, add OSS=yes option.
# - autodetect RetroArch, add RETROARCH=yes|no option.
# - document the above in the README.
# - document PULSE=no io README.
# - stop including snes9x.conf.default in the docdir, since it's
#   outdated and will cause snes9x to segfault if you try to use it!
# - since we now have 3 build options, make slack-desc show them.
# - add patch from upstream to speed up linking the libretro core if
#   -jX is in MAKEFLAGS.
# - add patch fro upstream to stop segfaulting if the config file is
#   missing the ScanlineIntensity variable. Means I can finaly remove
#   the "you should delete your old config file" from the README.

# 20180730 bkw:
# - BUILD=2.
# - add libretro/RetroArch, thanks to orbea.
# - add --without-portaudio to configure args. snes9x runs about
#   1 frame/sec if I start it up with the sound driver set to portaudio,
#   and I've gotten a report of it blasting high-volume white noise
#   thru the speakers if you switch to portaudio while a ROM is already
#   running. I can't see any reason to use it in favor of pulse, alsa,
#   oss, or sdl audio.
# - don't extract windows, mac, old-school unix stuff from tarball.
#   uses 50% less $TMP space.

# 20180623 bkw: update for 1.56.2.
# 20180611 bkw:
# - update for 1.56.1.
# - switch the UI from gtk3 to gtk2, as 14.2's gtk3 is too old.
# - add undocumented PULSE=no build option (in anticipation of 15.0's
#   pure-alsa-system).
# - add SDL2 to REQUIRES. technically, it's not truly required: snes9x
#   only uses SDL2 to support joysticks. playing with the keyboard/mouse
#   would still work without it. 15.0 is coming soon, and will have SDL2
#   in the core OS, so don't bother me about this decision.
# - update README, the snes9x_gtk build went away in 2010, no need to
#   mention it now. also add notes about upgrading from 1.55.
# 20171221 bkw: use --without-system-zip to build bundled unzip, instead
#               of adding minizip as a dependency.
# 20171213 bkw: update for 1.55.
# 20170302 bkw: use long-format github URL
# 20161015 bkw: update for 1.54.1. script has changed enough that it
# can't build 1.53 any more.

PRGNAM=snes9x
VERSION=${VERSION:-1.57}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}

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

CWD=$(pwd)
TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

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

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PRGNAM-$VERSION
# Don't extract the stuff we don't need, this saves 7.9MB in $TMP.
tar xvf $CWD/$PRGNAM-$VERSION.tar.gz \
        --wildcards --exclude '*/win32/*' \
        --exclude '*/macosx/*' --exclude '*/unix/*'
cd $PRGNAM-$VERSION
chown -R root:root .
find -L .  -perm /111 -a \! -perm 755 -a -exec chmod 755 {} \+ -o \
        \! -perm /111 -a \! -perm 644 -a -exec chmod 644 {} \+

# Various patches, depending on the version we're building. Currently
# this script should work with 1.56.2 and 1.57. Anything older and you're
# on your own.

# For 1.56.2, libretro.diff fixes the libretro build, it's upstream's
# commits abb4b4c39 and a77b3b379b. Already included in 1.57.

# For 1.57 (and 1.56.2 I hope), fix_config_file_segfaults.diff is
# upstream's commit 5e9f068. libretro_lto_variable is 21d6275 (thanks
# to orbea for coding this one & sending it upstream, based on my vague
# idea). Future 1.57.x or 1.58 will include these already.

# At some point, this set of cases will be too complex for me to want to
# maintain & test it, and it'll go away (this script will only support
# the latest version, whatever that happens to be).

case "$VERSION" in
  1.5[0-5]*|1.[0-4]*) ;; # doubt these build anyway
  1.56.2) PATCHES="libretro" ;;
  1.57)   PATCHES="fix_config_file_segfaults libretro_lto_variable";;
  *)      ;;
esac

[ -n "$PATCHES" ] && for p in $PATCHES; do
  [ -e "$CWD/$p.diff" ] && patch -p1 < "$CWD/$p.diff"
done

cd gtk
./autogen.sh

WITHPULSE=yes
if [ "$PULSE" = "no" ] || ! pkg-config --exists libpulse; then
  PULSEOPT="--without-pulseaudio"
  WITHPULSE=no
fi

WITHOSS=yes
if [ "${OSS:-no}" = "no" ]; then
  OSSOPT="--without-oss"
  WITHOSS=no
fi

CFLAGS="-g $SLKCFLAGS" \
CXXFLAGS="-g $SLKCFLAGS" \
./configure \
  --prefix=/usr \
  --libdir=/usr/lib${LIBDIRSUFFIX} \
  --bindir=/usr/games \
  --sysconfdir=/etc \
  --localstatedir=/var \
  --with-netplay \
  --without-system-zip \
  --with-gtk2 \
  --without-gtk3 \
  --without-portaudio \
  $PULSEOPT \
  $OSSOPT \
  --build=$ARCH-slackware-linux

make
make install DESTDIR=$PKG

# RetroArch support, contributed by orbea (Hunter Sezen).
# Note that the source here is self-contained, there's no build-time
# dependency on RetroArch or libretro or such.
# snes9x_libretro-info originally came from:
# https://raw.githubusercontent.com/libretro/libretro-super/383f18fd7c36ffd5fe76ebac58e9e596dde67e66/dist/info/snes9x_libretro.info
# Renamed .info => -info to avoid confusing SBo tools that deal with
# SBo's .info files.
# 20181201 bkw: made this optional, auto-detected, and controllable
# via environment. It makes the build take 7x as long, no point wasting
# time building it if it's not wanted/needed.

case "$RETROARCH" in
  yes) build_ra=yes ;;
  no)  build_ra=no ;;
  *)   if [ -x /usr/share/games/retroarch ]; then
         build_ra=yes
       else
         build_ra=no
       fi ;;
esac

if [ "$build_ra" = "yes" ]; then
  echo "=== Building libretro core"
  ( LIBNAM=${PRGNAM}_libretro
    cd ../libretro
    make LTO="-flto=jobserver"
    install -sDm0755 $LIBNAM.so $PKG/usr/lib${LIBDIRSUFFIX}/libretro/$LIBNAM.so
    install -Dm0644 $CWD/$LIBNAM-info \
      $PKG/usr/lib${LIBDIRSUFFIX}/libretro/info/$LIBNAM.info
  )
else
  echo "=== NOT building libretro core"
fi

mkdir -p $PKG/usr/man/man6
gzip -9c $CWD/snes9x-gtk.6 > $PKG/usr/man/man6/snes9x-gtk.6.gz
ln -s $PRGNAM-gtk.6.gz $PKG/usr/man/man6/$PRGNAM.6.gz
ln -s $PRGNAM-gtk $PKG/usr/games/$PRGNAM

PKGDOC=$PKG/usr/doc/$PRGNAM-$VERSION
OLDDOC=$PKGDOC/${PRGNAM}_original_docs
mkdir -p $OLDDOC
rm -f ../docs/snes9x.conf.default # outdated, useless
cp -a doc/* $PKGDOC
cp -a ../docs/* $OLDDOC
cat $CWD/README_docs.txt > $PKGDOC/README_docs.txt
cat $CWD/$PRGNAM.SlackBuild > $PKGDOC/$PRGNAM.SlackBuild

# We don't need 3 copies of the LGPL v2.1 (we already have the GPL
# and proprietary snes9x licenses...)
cd $PKGDOC
  rm -f snes_ntsc_license.txt ${PRGNAM}_original_docs/lgpl-2.1.txt
  ln -s lgpl.txt snes_ntsc_license.txt
  ln -s ../lgpl.txt ${PRGNAM}_original_docs/lgpl-2.1.txt
cd -

cat data/$PRGNAM.desktop > $PKG/usr/share/applications/$PRGNAM.desktop

mkdir -p $PKG/install
sed -e "s,@WITHPULSE@,$WITHPULSE," \
    -e "s,@WITHOSS@,$WITHOSS," \
    -e "s,@build_ra@,$build_ra," \
    < $CWD/slack-desc \
    > $PKG/install/slack-desc
cat $CWD/doinst.sh > $PKG/install/doinst.sh

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}