/***************************************************************************

Koi Koi Part 2
---------------
driver by
 Tomasz Slanina
 David Haywood

TODO:
- map inputs (temp mapped to keys a-l and z-x)
- is there (still..) some kind of protection ? timers looks weird (2nd player timer is frozen)
- colors (afaik color(?) prom outputs are connected to one of pals)


Basic hw is...
z80 (possibly xtal/4)
ay3-8910 (possibly xtal/8)
15.468xtal
1 dsw (8)
2kx8 SRAM (x2)


Few words about inputs (code @ $21bd):
--------------------------------------

There's four reads in a row of input port 3 - 32 possibilities.
But only 14 are valid - two lookup tables are used to decode the inputs.

For example, for one of input keys game expects data: 0,0,8,0
It's encoded (in internal lookup table, as well as in inputTab[]) as 0x68 :
 - bits 0-4 = data to return (valid values are 1,2,4,8,$10 - only one bit set)
 - bits 5-7 = read cycle (1-4) to return above data
All other reads should return 0.

Also, every other call, code at $21bd must return 0 (2 in 2nd read cycle)
to prevent disabling inputs.

***************************************************************************/

#include "driver.h"
#include "cpu/z80/z80.h"
#include "sound/ay8910.h"

static int inputcnt=0;
static int inputval=0;
static int inputlen=0;
static tilemap *koikoi_tilemap;
static int ioram[8];

static const int inputTab[]= {	0x22,	0x64, 0x44, 0x68, 0x30, 0x50, 0x70, 0x48, 0x28, 0x21, 0x41, 0x82, 0x81, 0x42  };

static TILE_GET_INFO( get_tile_info )
{
	int code  = videoram[tile_index]|((videoram[tile_index+0x400]<<2)&0x100);
	int color = videoram[tile_index+0x400]&0x1f;
	int flip  =(videoram[tile_index+0x400]&0x80)?(TILEMAP_FLIPX|TILEMAP_FLIPY):0;

	SET_TILE_INFO(	0,	code,	color, flip);
}

static WRITE8_HANDLER(vram_w)
{
	videoram[offset]=data;
	tilemap_mark_tile_dirty(koikoi_tilemap,offset&0x3ff);
}

static READ8_HANDLER(vram_r)
{
	return videoram[offset];
}

static READ8_DEVICE_HANDLER(input_r)
{
	if(inputcnt<0)
	{
		return 0;
	}

	if(!inputcnt)
	{
		int key=input_port_read(device->machine, "IN1");
		int keyval=0; //we must return 0 (0x2 in 2nd read) to clear 4 bit at $6600 and allow next read

		if(key)
		{
			while(!(key&1))	{	key>>=1;	keyval++;	}
		}

		inputval=inputTab[keyval]&0x1f;
		inputlen=inputTab[keyval]>>5;
	}

	if(inputlen==++inputcnt) //return expected value
	{
		return inputval^0xff;
	}

	if(inputcnt>4) //end of cycle
	{
		inputcnt=-1;
	}

	return 0xff; //return 0^0xff
}

static WRITE8_DEVICE_HANDLER(unknown_w)
{
	//unknown... could be input select (player 1 or 2 = fd/fe or ef/df(??) )
}

static READ8_HANDLER(io_r)
{
	if(!offset)
	{
			return input_port_read(space->machine, "IN0")^ioram[4]; //coin
	}
	return 0;
}

static WRITE8_HANDLER(io_w)
{
	if(offset==7 && data==0)
	{
		inputcnt=0; //reset read cycle counter
	}
	ioram[offset]=data;
}

static ADDRESS_MAP_START( readmem, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0x2fff) AM_ROM
	AM_RANGE(0x6000, 0x67ff) AM_RAM
	AM_RANGE(0x8000, 0x8000) AM_READ_PORT("DSW")
	AM_RANGE(0x7000, 0x77ff) AM_READWRITE(vram_r, vram_w) AM_BASE(&videoram)
	AM_RANGE(0x9000, 0x9007) AM_READWRITE(io_r, io_w)
ADDRESS_MAP_END

static ADDRESS_MAP_START( readport, ADDRESS_SPACE_IO, 8 )
	ADDRESS_MAP_GLOBAL_MASK(0xff)
	AM_RANGE(0x02, 0x02) AM_WRITENOP //unknown , many writes
	AM_RANGE(0x03, 0x03) AM_DEVREAD("ay", ay8910_r)
	AM_RANGE(0x06, 0x07) AM_DEVWRITE("ay", ay8910_data_address_w)
ADDRESS_MAP_END

static INPUT_PORTS_START( koikoi )
	PORT_START("DSW")	/* DSW */
	PORT_DIPNAME( 0x03, 0x01, "Timer C" )
	PORT_DIPSETTING(	0x00, "50" )
	PORT_DIPSETTING(	0x01, "70" )
	PORT_DIPSETTING(	0x02, "90" )
	PORT_DIPSETTING(	0x03, "110" )

	PORT_DIPNAME( 0x0c, 0x04, "Timer M" )
	PORT_DIPSETTING(	0x00, "120" )
	PORT_DIPSETTING(	0x04, "150" )
	PORT_DIPSETTING(	0x08, "180" )
	PORT_DIPSETTING(	0x0c, "210" )

	PORT_DIPNAME( 0x10, 0x00, DEF_STR( Coin_A ) )
	PORT_DIPSETTING(	0x00, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(	0x10, DEF_STR( 1C_2C ) )

	PORT_DIPNAME( 0x20, 0x00, DEF_STR( Unknown ) )
	PORT_DIPSETTING(	0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(	0x20, DEF_STR( On ) )

	PORT_DIPNAME( 0x40, 0x00, DEF_STR( Unknown ) )
	PORT_DIPSETTING(	0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(	0x40, DEF_STR( On ) )

	PORT_DIPNAME( 0x80, 0x00, "Test Mode" )
	PORT_DIPSETTING(	0x00, DEF_STR( Off ) )
	PORT_DIPSETTING(	0x80, DEF_STR( On ) )

	PORT_START("IN0")	/* IN0 */
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_COIN1 )
	PORT_BIT( 0xbf, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("IN1")	/* IN1 */
	PORT_BIT( 0x0002, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_CODE(KEYCODE_A) //1
	PORT_BIT( 0x0004, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_CODE(KEYCODE_S) //2
	PORT_BIT( 0x0008, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_CODE(KEYCODE_D) //3
	PORT_BIT( 0x0010, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_CODE(KEYCODE_F) //4
	PORT_BIT( 0x0020, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_CODE(KEYCODE_G) //5
	PORT_BIT( 0x0040, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_CODE(KEYCODE_H) //6
	PORT_BIT( 0x0080, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_CODE(KEYCODE_J) //7
	PORT_BIT( 0x0100, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_CODE(KEYCODE_K) //8

	PORT_BIT( 0x0800, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_CODE(KEYCODE_Z)
	PORT_BIT( 0x1000, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_CODE(KEYCODE_X)
	PORT_BIT( 0x2000, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_CODE(KEYCODE_C)

	PORT_BIT( 0x0200, IP_ACTIVE_HIGH, IPT_START1 )
	PORT_BIT( 0x0400, IP_ACTIVE_HIGH, IPT_START2 )

INPUT_PORTS_END

static PALETTE_INIT( koikoi ) //wrong
{
	int i;

	for (i = 0;i < 256;i++)
	{
		int bit0,bit1,bit2,bit3,r,g,b;

		bit0 = (color_prom[i] >> 0) & 0x01;
		bit1 = (color_prom[i] >> 1) & 0x01;
		bit2 = (color_prom[i] >> 2) & 0x01;
		bit3 = (color_prom[i] >> 3) & 0x01;

		r=bit0*255;
		g=bit1*255;
		b=bit2*255;

		palette_set_color(machine,i,MAKE_RGB(r,g,b));
	}
}

static VIDEO_START(koikoi)
{
	koikoi_tilemap = tilemap_create(machine, get_tile_info,tilemap_scan_rows,8,8,32,32);
}

static VIDEO_UPDATE(koikoi)
{
	tilemap_draw(bitmap,cliprect,koikoi_tilemap,0,0);
	return 0;
}


static const gfx_layout tilelayout =
{
	8, 8,
	RGN_FRAC(1,3),
	3,
	{ RGN_FRAC(0,3), RGN_FRAC(1,3), RGN_FRAC(2,3) },
	{ 0, 1, 2, 3, 4, 5, 6, 7 },
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 },
	8*8
};


static GFXDECODE_START( koikoi )
	GFXDECODE_ENTRY( "gfx1", 0x0000, tilelayout,      0, 32 )
GFXDECODE_END


static const ay8910_interface ay8910_config =
{
	AY8910_LEGACY_OUTPUT,
	AY8910_DEFAULT_LOADS,
	DEVCB_NULL,		 			DEVCB_HANDLER(input_r),
	DEVCB_HANDLER(unknown_w),	DEVCB_NULL
};

#define KOIKOI_CRYSTAL 15468000

static MACHINE_DRIVER_START( koikoi )

	/* basic machine hardware */
	MDRV_CPU_ADD("maincpu", Z80,KOIKOI_CRYSTAL/4)	/* ?? */
	MDRV_CPU_PROGRAM_MAP(readmem, 0)
	MDRV_CPU_IO_MAP(readport, 0)
	MDRV_CPU_VBLANK_INT("screen", nmi_line_pulse)

	/* video hardware */
	MDRV_SCREEN_ADD("screen", RASTER)
	MDRV_SCREEN_REFRESH_RATE(60)
	MDRV_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
	MDRV_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
	MDRV_SCREEN_SIZE(32*8, 32*8)
	MDRV_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 0*8, 32*8-1)

	MDRV_GFXDECODE(koikoi)
	MDRV_PALETTE_LENGTH(8*32)
	MDRV_PALETTE_INIT(koikoi)

	MDRV_VIDEO_START(koikoi)
	MDRV_VIDEO_UPDATE(koikoi)

	/* sound hardware */
	MDRV_SPEAKER_STANDARD_MONO("mono")

	MDRV_SOUND_ADD("ay", AY8910, KOIKOI_CRYSTAL/8)
	MDRV_SOUND_CONFIG(ay8910_config)
  MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.10)

MACHINE_DRIVER_END


/***************************************************************************

  Game driver(s)

***************************************************************************/


ROM_START( koikoi )
	ROM_REGION( 0x10000, "maincpu", 0 )	/* code */
	ROM_LOAD( "ic56", 0x0000, 0x1000, CRC(bdc68f9d) SHA1(c45fbc95abb37f750acc1d9f3b35ad0f41af097d) )
	ROM_LOAD( "ic55", 0x1000, 0x1000, CRC(fe09248a) SHA1(c192795678068e387bd406f5cd1c5aba5f5ef66a) )
	ROM_LOAD( "ic54", 0x2000, 0x1000, CRC(925fc57c) SHA1(4c79df92b6617fe84e61359c8e6e3b907b138777) )

	ROM_REGION( 0x3000, "gfx1", 0 )	/* gfx */
	ROM_LOAD( "ic33", 0x0000, 0x1000, CRC(9e4d563b) SHA1(63664dcffc2eb198a161c73131b95a66b2067424) )
	ROM_LOAD( "ic26", 0x1000, 0x1000, CRC(79cb1e93) SHA1(4d08b3d88727b437673f7a51d47396f19bbc3caa) )
	ROM_LOAD( "ic18", 0x2000, 0x1000, CRC(c209362d) SHA1(0620c19fe72e8407db0f487b6413c5d45ac8046c) )

	ROM_REGION( 0x0100, "proms", 0 )
	ROM_LOAD( "prom.ic23", 0x000, 0x100,  CRC(f1d169a6) SHA1(5ee4b1dfe61e8b97a90cc113ba234298189f1a73) )

	ROM_REGION( 0x0a00, "plds", ROMREGION_DISPOSE )
	ROM_LOAD( "pal16r8-10_pink.ic9",   0x0000, 0x0104, CRC(9f8fdb95) SHA1(cdcdb1a6baef18961cf6c75fba0c3aba47f3edbb) )
	ROM_LOAD( "pal16r8-10_green.ic15", 0x0200, 0x0104, CRC(da7b8b95) SHA1(a4eb12f2365ff2b6057e4a2e225e8f879a961d45) )
	ROM_LOAD( "pal16r8a_yellow.ic8",   0x0400, 0x0104, CRC(7d8da540) SHA1(28925d1fb4ef670e9c9d24860b67fdff8791c6a9) )
	ROM_LOAD( "pal16r8a_brown.ic11",   0x0600, 0x0104, CRC(fff46363) SHA1(97f673c862e9d5b12cac283000a779c465c76828) )
	ROM_LOAD( "pal16r8a_red.ic10",     0x0800, 0x0104, CRC(027ad661) SHA1(fa5aafe6deb3a9865498152b92dd3776ea10a51d) )

ROM_END

GAME( 1982, koikoi,   0,      koikoi, koikoi, 0, ROT270, "Kiwako", "Koi Koi Part 2", GAME_WRONG_COLORS )
