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

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

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

compile_binary()
{
  c="$CC $CFLAGS $TMPC -o $TMPB $LDFLAGS $@"
  echo $c >> config.log
  $c >> config.log 2>&1
}

check_define()
{
  $CC -E -dD $CFLAGS pico/arm_features.h | grep -q $1 || return 1
  return 0
}

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

platform_list="generic pandora gp2x opendingux rpi1 rpi2"
platform="generic"
sound_driver_list="oss alsa sdl"
sound_drivers=""
have_armv5=""
have_armv6=""
have_armv7=""
have_arm_neon=""
have_libavcodec=""
need_sdl="no"
need_xlib="no"
# these are for known platforms
optimize_cortexa8="no"
optimize_cortexa7="no"
optimize_arm1176jzf="no"
optimize_arm926ej="no"
optimize_arm920="no"

# hardcoded stuff
CC="${CC-${CROSS_COMPILE}gcc}"
CXX="${CXX-${CROSS_COMPILE}g++}"
AS="${AS-${CROSS_COMPILE}as}"
STRIP="${STRIP-${CROSS_COMPILE}strip}"
test -n "$SDL_CONFIG" || SDL_CONFIG="`$CC --print-sysroot 2> /dev/null || true`/usr/bin/sdl-config"
MAIN_LDLIBS="$LDLIBS -lm"
config_mak="config.mak"

fail()
{
  echo "$@"
  exit 1
}

# call during arg parsing, so that cmd line can override platform defaults
set_platform()
{
  platform=$1
  case "$platform" in
  rpi1)
    optimize_arm1176jzf="yes"
    ;;
  rpi2)
    optimize_cortexa7="yes"
    have_arm_neon="yes"
    ;;
  generic)
    ;;
  opendingux)
    sound_drivers="sdl"
    ;;
  pandora)
    sound_drivers="oss alsa"
    optimize_cortexa8="yes"
    have_arm_neon="yes"
    ;;
  gp2x)
    sound_drivers="oss"
    optimize_arm920="yes"
    CFLAGS="$CFLAGS -D__GP2X__"
    if [ "$CROSS_COMPILE" = "arm-linux-" ]; then
      # still using static, dynamic linking slows Wiz 1-10%
      # also libm on F100 is not compatible
      MAIN_LDLIBS="$MAIN_LDLIBS -static"
    fi
    ;;
  *)
    fail "unsupported platform: $platform"
    ;;
  esac
}

for opt do
  optarg=`expr "x$opt" : 'x[^=]*=\(.*\)'` || true
  case "$opt" in
  --help|-h) show_help="yes"
  ;;
  --platform=*) set_platform "$optarg"
  ;;
  --sound-drivers=*) sound_drivers="$optarg"
  ;;
  *) 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-drivers=LIST     sound output drivers [guessed]"
  echo "                           available: $sound_driver_list"
  echo "influential environment variables:"
  echo "  CROSS_COMPILE CC CXX AS STRIP CFLAGS ASFLAGS LDFLAGS LDLIBS"
  exit 1
fi

# validate selections
if [ "x$sound_drivers" != "x" ]; then
  for d in $sound_drivers; do
    if ! echo $sound_driver_list | grep -q "\<$d\>"; then
      fail "unsupported sound driver: $sound_driver"
    fi
  done
fi

if ! test -f "platform/libpicofe/README"; then
  fail "libpicofe is missing, please run 'git submodule update --init'"
fi

#if [ "$need_warm" = "yes" ]; then
#  if ! test -f "frontend/warm/README"; then
#    fail "wARM is missing, please run 'git submodule init && git submodule update'"
#  fi
#fi

# basic compiler test
cat > $TMPC <<EOF
int main(void) { return 0; }
EOF
if ! compile_binary; then
  fail "compiler test failed, please check config.log"
fi

if [ -z "$ARCH" ]; then
  ARCH=`$CC -dumpmachine | awk -F '-' '{print $1}'`
fi

case "$ARCH" in
arm*)
  # ARM stuff
  ARCH="arm"

  if [ "$optimize_cortexa8" = "yes" ]; then
    CFLAGS="$CFLAGS -mcpu=cortex-a8 -mtune=cortex-a8"
    ASFLAGS="$ASFLAGS -mcpu=cortex-a8"
  fi
  if [ "$optimize_cortexa7" = "yes" ]; then
    CFLAGS="$CFLAGS -mcpu=cortex-a7"
    ASFLAGS="$ASFLAGS -mcpu=cortex-a7"
  fi
  if [ "$optimize_arm1176jzf" = "yes" ]; then
    CFLAGS="$CFLAGS -mcpu=arm1176jzf-s -mfloat-abi=hard"
    ASFLAGS="$ASFLAGS -mcpu=arm1176jzf-s -mfloat-abi=hard"
  fi
  if [ "$optimize_arm926ej" = "yes" ]; then
    CFLAGS="$CFLAGS -mcpu=arm926ej-s -mtune=arm926ej-s"
    ASFLAGS="$ASFLAGS -mcpu=arm926ej-s -mfloat-abi=softfp"
  fi
  if [ "$optimize_arm920" = "yes" ]; then
    CFLAGS="$CFLAGS -mcpu=arm920t -mtune=arm920t"
    ASFLAGS="$ASFLAGS -mcpu=arm920t -mfloat-abi=soft"
  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_armv7" = "x" ]; then
    if check_define HAVE_ARMV7; then
      have_armv7="yes"
      have_armv6="yes"
      have_armv5="yes"
    fi
  fi
  if [ "x$have_armv6" = "x" ]; then
    if check_define HAVE_ARMV6; then
      have_armv6="yes"
      have_armv5="yes"
    fi
  fi
  if [ "x$have_armv5" = "x" ]; then
    have_armv5=`check_define HAVE_ARMV5 && echo yes` || true
  fi

  # automatically set mfpu and mfloat-abi if they are not set
  if [ "$have_arm_neon" = "yes" ]; then
    fpu="neon"
  elif [ "$have_armv6" = "yes" ]; then
    fpu="vfp"
  fi
  if [ "x$fpu" != "x" ]; then
    echo "$CFLAGS" | grep -q -- '-mfpu=' || CFLAGS="$CFLAGS -mfpu=$fpu"
    echo "$ASFLAGS" | grep -q -- '-mfpu=' || ASFLAGS="$ASFLAGS -mfpu=$fpu"
    floatabi_set_by_gcc=`$CC -v 2>&1 | grep -q -- --with-float= && echo yes` || true
    if [ "$floatabi_set_by_gcc" != "yes" ]; then
      echo "$CFLAGS" | grep -q -- '-mfloat-abi=' || CFLAGS="$CFLAGS -mfloat-abi=softfp"
      echo "$ASFLAGS" | grep -q -- '-mfloat-abi=' || ASFLAGS="$ASFLAGS -mfloat-abi=softfp"
    fi
  fi

  # must disable thumb as recompiler can't handle it
  if check_define __thumb__; then
    CFLAGS="$CFLAGS -marm"
  fi

  # warn about common mistakes
  if [ "$platform" != "gp2x" -a "$have_armv5" != "yes" ]; then
    if ! echo "$CFLAGS" | grep -q -- '-mcpu=\|-march='; then
      echo "Warning: compiling for ARMv4, is that really what you want?"
      echo "You probably should specify -mcpu= or -march= like this:"
      echo "  CFLAGS=-march=armv6 ./configure ..."
    fi
  fi
  if [ "$have_arm_neon" = "yes" -a "$have_armv7" != "yes" ]; then
    echo "Warning: compiling for NEON, but not ARMv7?"
    echo "You probably want to specify -mcpu= or -march= like this:"
    echo "  CFLAGS=-march=armv7-a ./configure ..."
  fi
  ;;
*)
  ;;
esac

case "$platform" in
rpi1 | rpi2 | generic | opendingux)
  need_sdl="yes"
  ;;
esac

# header/library presence tests
check_zlib()
{
  cat > $TMPC <<EOF
  #include <zlib.h>
  int main(void) { uncompress(0, 0, 0, 0); }
EOF
  compile_binary "$@"
}

check_libpng()
{
  cat > $TMPC <<EOF
  #include <png.h>
  void main() { png_init_io(0, 0); }
EOF
#  compile_binary
  compile_object
}

check_oss()
{
  cat > $TMPC <<EOF
  #include <sys/soundcard.h>
  #include <sys/ioctl.h>
  void main() { int a=0; ioctl(0, SNDCTL_DSP_SETFMT, &a); }
EOF
  compile_binary
}

check_alsa()
{
  cat > $TMPC <<EOF
  #include <alsa/asoundlib.h>
  void main() { snd_pcm_open(0, 0, 0, 0); }
EOF
  compile_binary "$@"
}

check_sdl()
{
  cat > $TMPC <<EOF
  #include <SDL.h>
  void main() { SDL_OpenAudio(0, 0); }
EOF
  compile_binary "$@"
}

check_libavcodec()
{
  cat > $TMPC <<EOF
  #include <libavcodec/avcodec.h>
  void main() { avcodec_decode_audio3(0, 0, 0, 0); }
EOF
  compile_object "$@"
}

MAIN_LDLIBS="$MAIN_LDLIBS -lz"
check_zlib -lz || fail "please install zlib (libz-dev)"

MAIN_LDLIBS="-lpng $MAIN_LDLIBS"
check_libpng || fail "please install libpng (libpng-dev)"

if check_libavcodec; then
  have_libavcodec="yes"
  # add -ldl if needed
  case "$MAIN_LDLIBS" in
    *"-ldl"*) ;;
    *) MAIN_LDLIBS="-ldl $MAIN_LDLIBS" ;;
  esac
fi

# find what audio support we can compile
if [ "x$sound_drivers" = "x" ]; then
  if check_oss; then sound_drivers="$sound_drivers oss"; fi
  if check_alsa -lasound; then
    sound_drivers="$sound_drivers alsa"
    MAIN_LDLIBS="-lasound $MAIN_LDLIBS"
  fi
  if [ "$need_sdl" = "yes" ] || check_sdl `$SDL_CONFIG --cflags --libs`; then
    sound_drivers="$sound_drivers sdl"
    need_sdl="yes"
  fi
else
  if echo $sound_drivers | grep -q "\<oss\>"; then
    check_oss || fail "oss support is missing"
  fi
  if echo $sound_drivers | grep -q "\<alsa\>"; then
    MAIN_LDLIBS="-lasound $MAIN_LDLIBS"
    check_alsa -lasound || fail "please install libasound2-dev"
  fi
fi

if [ "$need_sdl" = "yes" ]; then
  [ -x "$SDL_CONFIG" ] || \
    fail "sdl-config is missing; please install libsdl (libsdl1.2-dev)"
  CFLAGS="$CFLAGS `$SDL_CONFIG --cflags`"
  MAIN_LDLIBS="`$SDL_CONFIG --libs` $MAIN_LDLIBS"
  check_sdl `$SDL_CONFIG --libs` || fail "please install libsdl (libsdl1.2-dev)"
fi

cat > $TMPC <<EOF
void test(void *f, void *d) { fread(d, 1, 1, f); }
EOF
if compile_object -Wno-unused-result; then
  CFLAGS="$CFLAGS -Wno-unused-result"
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_libavcodec" != "x" || have_libavcodec="no"

echo "architecture        $ARCH"
echo "platform            $platform"
echo "sound drivers       $sound_drivers"
echo "C compiler          $CC"
echo "C compiler flags    $CFLAGS"
echo "libraries           $MAIN_LDLIBS"
echo "linker flags        $LDFLAGS"
echo "libavcodec (mp3)    $have_libavcodec"
# echo "ARMv7 optimizations $have_armv7"

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 "CXX = $CXX" >> $config_mak
echo "AS = $AS" >> $config_mak
echo "STRIP = $STRIP" >> $config_mak
echo "CFLAGS += $CFLAGS" >> $config_mak
echo "ASFLAGS += $ASFLAGS" >> $config_mak
echo "LDFLAGS += $LDFLAGS" >> $config_mak
echo "LDLIBS += $MAIN_LDLIBS" >> $config_mak
echo >> $config_mak

echo "ARCH = $ARCH" >> $config_mak
echo "PLATFORM = $platform" >> $config_mak
echo "SOUND_DRIVERS = $sound_drivers" >> $config_mak
if [ "$have_libavcodec" = "yes" ]; then
  echo "HAVE_LIBAVCODEC = 1" >> $config_mak
fi

# GP2X toolchains are too old for UAL asm,
# so add this here to not litter main Makefile
if [ "$platform" = "g1p2x" ]; then
  echo >> $config_mak
  echo "%.o: %.S" >> $config_mak
  echo "        $(CC) $(CFLAGS) -E -c $^ -o /tmp/$(notdir $@).s" >> $config_mak
  echo "        $(AS) $(ASFLAGS) /tmp/$(notdir $@).s -o $@" >> $config_mak
fi

# use pandora's skin (for now)
test -e skin || ln -s platform/pandora/skin skin

# vim:shiftwidth=2:expandtab