#!/bin/sh
# some elements originated from qemu configure
set -e

TMPC="/tmp/pcsx-conf-${RANDOM}-$$-${RANDOM}.c"
TMPO="/tmp/pcsx-conf-${RANDOM}-$$-${RANDOM}.o"
trap "rm -f $TMPC $TMPO" EXIT INT QUIT TERM
rm -f config.log

compile_object()
{
  c="$CC $CFLAGS -c $TMPC -o $TMPO $1"
  echo $c >> config.log
  $c >> config.log 2>&1
}

check_define()
{
  echo "" > $TMPC
  $CC -E -dD $CFLAGS $TMPC | grep -q $1 || return 1
  return 0
}

# setting options to "yes" or "no" will make that choice default,
# "" means "autodetect".

platform_list="generic pandora maemo caanoo"
platform="generic"
sound_driver_list="oss alsa none"
sound_driver="alsa"
ram_fixed="no"
drc_cache_base="no"
have_armv6=""
have_armv7=""
have_arm_neon=""
have_tslib=""
enable_dynarec="yes"
# these are for known platforms
optimize_cortexa8="no"
optimize_arm926ej="no"

# hardcoded stuff
CC="${CC-${CROSS_COMPILE}gcc}"
AS="${AS-${CROSS_COMPILE}as}"
AR="${AS-${CROSS_COMPILE}ar}"
config_mak="config.mak"

# call during arg parsing, so that cmd line can override platform defaults
set_platform()
{
  platform=$1
  case "$platform" in
  generic)
    ;;
  pandora)
    sound_driver="oss"
    ram_fixed="yes"
    drc_cache_base="yes"
    optimize_cortexa8="yes"
    have_arm_neon="yes"
    ;;
  maemo)
    ram_fixed="yes"
    drc_cache_base="yes"
    optimize_cortexa8="yes"
    have_arm_neon="yes"
    ;;
  caanoo)
    sound_driver="oss"
    ram_fixed="yes"
    drc_cache_base="yes"
    optimize_arm926ej="yes"
    ;;
  *)
    echo "unsupported platform: $platform"
    exit 1
    ;;
  esac
}

for opt do
  optarg=`expr "x$opt" : 'x[^=]*=\(.*\)'` || true
  case "$opt" in
  --help|-h) show_help="yes"
  ;;
  --platform=*) set_platform "$optarg"
  ;;
  --sound-driver=*) sound_driver="$optarg"
  ;;
  --enable-neon) have_arm_neon="yes"
  ;;
  --disable-neon) have_arm_neon="no"
  ;;
  --disable-dynarec) enable_dynarec="no"
  ;;
  *) echo "ERROR: unknown option $opt"; show_help="yes"
  ;;
  esac
done

if [ "$show_help" = "yes" ]; then
  echo "options:"
  echo "  --help                   print this message"
  echo "  --platform=NAME          target platform [$platform]"
  echo "                           available: $platform_list"
  echo "  --sound-driver=NAME      sound output driver [$sound_driver]"
  echo "                           available: $sound_driver_list"
  echo "  --enable-neon"
  echo "  --disable-neon           enable/disable ARM NEON optimizations [guessed]"
  echo "  --disable-dynarec        disable dynamic recompiler"
  echo "                           (dynarec is only available and enabled on ARM)"
  echo "influential environment variables:"
  echo "  CROSS_COMPILE CC AS AR CFLAGS ASFLAGS LDFLAGS LDLIBS"
  exit 1
fi

case "$sound_driver" in
oss|alsa|none)
  ;;
*)
  echo "unsupported sound driver: $sound_driver"
  exit 1
  ;;
esac

if [ -z "$ARCH" ]; then
  ARCH=`$CC -v 2>&1 | grep -i 'target:' | awk '{print $2}' \
        | awk -F '-' '{print $1}'`
fi

# ARM stuff
if [ "$ARCH" = "arm" ]; then
  if [ "$optimize_cortexa8" = "yes" ]; then
  # both: -mfpu=neon
    CFLAGS="$CFLAGS -mcpu=cortex-a8 -mtune=cortex-a8"
    ASFLAGS="$ASFLAGS -mcpu=cortex-a8"
  fi
  if [ "$optimize_arm926ej" = "yes" ]; then
    CFLAGS="$CFLAGS -mcpu=arm926ej-s -mtune=arm926ej-s"
    ASFLAGS="$ASFLAGS -mcpu=arm926ej-s -mfloat-abi=softfp"
  fi

  if [ "x$have_arm_neon" = "x" ]; then
    # detect NEON from user-supplied cflags to enable asm code
    have_arm_neon=`check_define __ARM_NEON__ && echo yes` || true
  fi
  if [ "x$have_armv6" = "x" ]; then
    have_armv6=`check_define __ARM_ARCH_6 && echo yes` || true
  fi
  if [ "x$have_armv7" = "x" ]; then
    if check_define __ARM_ARCH_7A__; then
      have_armv6="yes"
      have_armv7="yes"
    fi
  fi

  # set mfpu and mfloat-abi if they are not set
  if [ "$have_arm_neon" = "yes" ]; then
    echo "$CFLAGS" | grep -q -- '-mfpu=' || CFLAGS="$CFLAGS -mfpu=neon"
    echo "$ASFLAGS" | grep -q -- '-mfpu=' || ASFLAGS="$ASFLAGS -mfpu=neon"
  elif [ "$have_armv6" = "yes" ]; then
    echo "$CFLAGS" | grep -q -- '-mfpu=' || CFLAGS="$CFLAGS -mfpu=vfp"
    echo "$ASFLAGS" | grep -q -- '-mfpu=' || ASFLAGS="$ASFLAGS -mfpu=vfp"
  fi
  if [ "$have_armv6" = "yes" ]; then
    echo "$CFLAGS" | grep -q -- '-mfloat-abi=' || CFLAGS="$CFLAGS -mfloat-abi=softfp"
    echo "$ASFLAGS" | grep -q -- '-mfloat-abi=' || ASFLAGS="$ASFLAGS -mfloat-abi=softfp"
  fi

  if [ "$have_armv7" = "yes" ]; then
    ASFLAGS="$ASFLAGS --defsym HAVE_ARMV7=1"
  else
    ASFLAGS="$ASFLAGS --defsym HAVE_ARMV7=0"
  fi
else
  # dynarec only available on ARM
  enable_dynarec="no"
fi

if [ "$ARCH" = "x86_64" ]; then
  # currently we are full of 32bit assumptions,
  # at least savestate compatibility will break without these
  CFLAGS="$CFLAGS -m32"
  LDFLAGS="$LDFLAGS -m32"
fi

# supposedly we can avoid -fPIC on armv5 for slightly better performace?
if [ "$ARCH" != "arm" -o "$have_armv6" = "yes" ]; then
  PLUGIN_CFLAGS="$PLUGIN_CFLAGS -fPIC"
fi

if [ "$ram_fixed" = "yes" ]; then
  CFLAGS="$CFLAGS -DRAM_FIXED"
fi

if [ "$platform" = "generic" ]; then
  generic_cflags=`sdl-config --cflags`
  generic_ldlibs=`sdl-config --libs`
  CFLAGS="$CFLAGS $generic_cflags"
  LDFLAGS="$LDFLAGS $generic_ldlibs"
elif [ "$platform" = "maemo" ]; then
  maemo_cflags=`pkg-config --cflags hildon-1`
  maemo_ldlibs=`pkg-config --libs hildon-1`
  CFLAGS="$CFLAGS -DMAEMO -DMAEMO_CHANGES $maemo_cflags"
  LDFLAGS="$LDFLAGS $maemo_ldlibs"
fi

# check for tslib (only headers needed)
if [ "x$have_tslib" = "x" ]; then
  cat > $TMPC <<EOF
  #include <tslib.h>
  void test(struct ts_sample sample) {}
EOF
  if compile_object; then
    have_tslib="yes"
  else
    have_tslib="no"
  fi
fi

# set things that failed to autodetect to "no"
test "x$have_armv6" != "x" || have_armv6="no"
test "x$have_armv7" != "x" || have_armv7="no"
test "x$have_arm_neon" != "x" || have_arm_neon="no"

echo "architecture        $ARCH"
echo "platform            $platform"
echo "sound driver        $sound_driver"
echo "C compiler          $CC"
echo "C compiler flags    $CFLAGS"
echo "linker flags        $LDFLAGS"
echo "enable dynarec      $enable_dynarec"
echo "ARMv7 optimizations $have_armv7"
echo "enable ARM NEON     $have_arm_neon"
echo "tslib support       $have_tslib"

echo "# Automatically generated by configure" > $config_mak
printf "# Configured with:" >> $config_mak
printf " '%s'" "$0" "$@" >> $config_mak
echo >> $config_mak

echo "CC = $CC" >> $config_mak
echo "AS = $AS" >> $config_mak
echo "CFLAGS += $CFLAGS" >> $config_mak
echo "ASFLAGS += $ASFLAGS" >> $config_mak
echo "LDFLAGS += $LDFLAGS" >> $config_mak
echo "LDLIBS += $LDLIBS" >> $config_mak
echo "PLUGIN_CFLAGS += $PLUGIN_CFLAGS" >> $config_mak
echo >> $config_mak

echo "ARCH = $ARCH" >> $config_mak
echo "PLATFORM = $platform" >> $config_mak
case "$sound_driver" in
oss)
  echo "USE_OSS = 1" >> $config_mak
  ;;
alsa)
  echo "USE_ALSA = 1" >> $config_mak
  ;;
none)
  echo "USE_NO_SOUND = 1" >> $config_mak
  ;;
esac
if [ "$have_armv6" = "yes" ]; then
  echo "HAVE_ARMV6 = 1" >> $config_mak
fi
if [ "$have_armv7" = "yes" ]; then
  echo "HAVE_ARMV7 = 1" >> $config_mak
fi
if [ "$have_arm_neon" = "yes" ]; then
  echo "HAVE_NEON = 1" >> $config_mak
fi
if [ "$have_tslib" = "yes" ]; then
  echo "HAVE_TSLIB = 1" >> $config_mak
fi
if [ "$enable_dynarec" = "yes" ]; then
  echo "USE_DYNAREC = 1" >> $config_mak
fi
if [ "$drc_cache_base" = "yes" ]; then
  echo "DRC_CACHE_BASE = 1" >> $config_mak
fi

# vim:shiftwidth=2:expandtab