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

TMPC="/tmp/pcsx-conf-${RANDOM}-$$-${RANDOM}.c"
TMPO="/tmp/pcsx-conf-${RANDOM}-$$-${RANDOM}.o"
TMPB="/tmp/pcsx-conf-${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 $MAIN_LDLIBS $@"
  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 libretro"
platform="generic"
builtin_gpu_list="peops unai neon"
builtin_gpu=""
sound_driver_list="oss alsa sdl pulseaudio libretro"
sound_drivers=""
plugins="plugins/spunull/spunull.so \
plugins/dfxvideo/gpu_peops.so plugins/gpu_unai/gpu_unai.so"
ram_fixed="no"
drc_cache_base="no"
have_armv6=""
have_armv7=""
have_arm_neon=""
have_tslib=""
enable_dynarec="yes"
need_sdl="no"
need_libpicofe="yes"
need_warm="no"
# these are for known platforms
optimize_cortexa8="no"
optimize_arm926ej="no"

# hardcoded stuff
CC="${CC-${CROSS_COMPILE}gcc}"
CXX="${CXX-${CROSS_COMPILE}g++}"
AS="${AS-${CROSS_COMPILE}as}"
AR="${AS-${CROSS_COMPILE}ar}"
MAIN_LDLIBS="$LDLIBS -ldl -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
  generic)
    ;;
  pandora)
    sound_drivers="oss alsa"
    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_drivers="oss"
    ram_fixed="yes"
    drc_cache_base="yes"
    optimize_arm926ej="yes"
    need_warm="yes"
    ;;
  libretro)
    sound_drivers="libretro"
    need_libpicofe="no"
    ;;
  *)
    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"
  ;;
  --gpu=*) builtin_gpu="$optarg"
  ;;
  --sound-drivers=*) sound_drivers="$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 "  --gpu=NAME               builtin gpu plugin [guessed]"
  echo "                           available: $builtin_gpu_list"
  echo "  --sound-drivers=LIST     sound output drivers [guessed]"
  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 CXX AS AR CFLAGS ASFLAGS LDFLAGS LDLIBS"
  exit 1
fi

# validate selections
if [ "x$builtin_gpu" != "x" ]; then
  if ! echo $builtin_gpu_list | grep -q "\<$builtin_gpu\>"; then
    fail "unsupported builtin gpu plugin: $builtin_gpu"
  fi
fi

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

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
    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

  if [ "x$builtin_gpu" = "x" ]; then
    if [ "$have_arm_neon" = "yes" ]; then
      builtin_gpu="neon"
    elif [ "$have_armv7" != "yes" ]; then
      # pre-ARMv7 hardware is usually not fast enough for peops
      builtin_gpu="unai"
    else
      builtin_gpu="peops"
    fi
  fi

  # automatically 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
  floatabi_set_by_gcc=`$CC -v 2>&1 | grep -q -- --with-float= && echo yes` || true
  if [ "$floatabi_set_by_gcc" != "yes" -a "$have_armv6" = "yes" ]; then
    echo "$CFLAGS" | grep -q -- '-mfloat-abi=' || CFLAGS="$CFLAGS -mfloat-abi=softfp"
    echo "$ASFLAGS" | grep -q -- '-mfloat-abi=' || ASFLAGS="$ASFLAGS -mfloat-abi=softfp"
  fi

  # must disable thumb as recompiler can't handle it
  if check_define __thumb__; then
    CFLAGS="$CFLAGS -marm"
  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 [ "x$builtin_gpu" = "x" ]; then
  builtin_gpu="peops"
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

case "$platform" in
generic)
  need_sdl="yes"
  ;;
maemo)
  maemo_cflags=`pkg-config --cflags hildon-1`
  maemo_ldlibs=`pkg-config --libs hildon-1`
  CFLAGS="$CFLAGS -DMAEMO -DMAEMO_CHANGES $maemo_cflags"
  MAIN_LDLIBS="$MAIN_LDLIBS $maemo_ldlibs"
  ;;
libretro)
  CFLAGS="$CFLAGS -fPIC"
  MAIN_LDFLAGS="$MAIN_LDFLAGS -shared -Wl,--no-undefined"
  ;;
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_bzlib()
{
  cat > $TMPC <<EOF
  #include <bzlib.h>
  void main() { BZ2_bzBuffToBuffDecompress(0, 0, 0, 0, 0, 0); }
EOF
  compile_object
}

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

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

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

check_bzlib || fail "please install bz2lib (libbz2-dev)"

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

# 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 || fail "please install libasound2-dev"
  fi
fi

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

# check for GLES headers
cat > $TMPC <<EOF
#include <GLES/gl.h>
#include <GLES/glext.h>
#include <EGL/egl.h>
void *test(void) {
  return eglGetDisplay( (EGLNativeDisplayType)0 );
}
EOF
if compile_object; then
  plugins="$plugins plugins/gpu-gles/gpu_gles.so"
fi

if [ "$have_arm_neon" = "yes" -a "$builtin_gpu" != "neon" ]; then
  plugins="$plugins plugins/gpu_neon/gpu_neon.so"
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

# short plugin list for display
for p in $plugins; do
  p1=`basename $p`
  plugins_short="$p1 $plugins_short"
done

# 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 "built-in GPU        $builtin_gpu"
echo "sound drivers       $sound_drivers"
echo "plugins             $plugins_short"
echo "C compiler          $CC"
echo "C compiler flags    $CFLAGS"
echo "libraries           $MAIN_LDLIBS"
echo "linker flags        $LDFLAGS$MAIN_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 "CXX = $CXX" >> $config_mak
echo "AS = $AS" >> $config_mak
echo "CFLAGS += $CFLAGS" >> $config_mak
echo "ASFLAGS += $ASFLAGS" >> $config_mak
echo "LDFLAGS += $LDFLAGS" >> $config_mak
echo "MAIN_LDFLAGS += $MAIN_LDFLAGS" >> $config_mak
echo "MAIN_LDLIBS += $MAIN_LDLIBS" >> $config_mak
echo "PLUGIN_CFLAGS += $PLUGIN_CFLAGS" >> $config_mak
echo >> $config_mak

if [ "$platform" = "libretro" ]; then
  echo "TARGET = libretro.so" >> $config_mak
fi
echo "ARCH = $ARCH" >> $config_mak
echo "PLATFORM = $platform" >> $config_mak
echo "BUILTIN_GPU = $builtin_gpu" >> $config_mak
echo "SOUND_DRIVERS = $sound_drivers" >> $config_mak
if [ "$ARCH" = "arm" ]; then
  echo "PLUGINS = $plugins" >> $config_mak
else
  echo -n "PLUGINS =" >> $config_mak
  for p in $plugins; do
    echo -n " ${p}.${ARCH}" >> $config_mak
  done
  echo >> $config_mak
fi
if [ "$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

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

# vim:shiftwidth=2:expandtab