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

  Mad Motor								(c) 1989 Mitchell Corporation

  But it's really a Data East game..  Bad Dudes era graphics hardware with
  Dark Seal era sound hardware.  Maybe a license for a specific territory?

  Emulation by Bryan McPhail, mish@tendril.force9.net

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

#include "driver.h"
#include "vidhrdw/generic.h"
#include "cpu/h6280/h6280.h"

int  madmotor_vh_start(void);
void madmotor_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh);

int madmotor_pf1_rowscroll_r(int offset);
void madmotor_pf1_rowscroll_w(int offset,int data);
int madmotor_pf1_data_r(int offset);
int madmotor_pf2_data_r(int offset);
int madmotor_pf3_data_r(int offset);
void madmotor_pf1_data_w(int offset,int data);
void madmotor_pf2_data_w(int offset,int data);
void madmotor_pf3_data_w(int offset,int data);
void madmotor_pf1_control_w(int offset,int data);
void madmotor_pf2_control_w(int offset,int data);
void madmotor_pf3_control_w(int offset,int data);
extern unsigned char *madmotor_pf1_rowscroll;
extern unsigned char *madmotor_pf1_data,*madmotor_pf2_data,*madmotor_pf3_data;
static unsigned char *madmotor_ram;

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

static void madmotor_sound_w(int offset, int data)
{
	soundlatch_w(0,data & 0xff);
	cpu_cause_interrupt(1,H6280_INT_IRQ1);
}

static int madmotor_control_r(int offset)
{
	switch (offset)
	{
		case 2: /* Player 1 & Player 2 joysticks & fire buttons */
			return (readinputport(0) + (readinputport(1) << 8));

		case 4: /* Dip Switches */
			return (readinputport(3) + (readinputport(4) << 8));

		case 6: /* Credits */
			return readinputport(2);
	}

	if (errorlog) fprintf(errorlog,"Unknown control read at %d\n",offset);
	return 0xffff;
}

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

static struct MemoryReadAddress madmotor_readmem[] =
{
	{ 0x000000, 0x07ffff, MRA_ROM },
	{ 0x184000, 0x1847ff, madmotor_pf1_rowscroll_r },
	{ 0x188000, 0x189fff, madmotor_pf1_data_r },
	{ 0x198000, 0x1987ff, madmotor_pf2_data_r },
	{ 0x1a4000, 0x1a4fff, madmotor_pf3_data_r },
	{ 0x18c000, 0x18c001, MRA_NOP },
	{ 0x19c000, 0x19c001, MRA_NOP },
	{ 0x3e0000, 0x3e3fff, MRA_BANK1 },
	{ 0x3e8000, 0x3e87ff, MRA_BANK2 },
	{ 0x3f0000, 0x3f07ff, paletteram_word_r },
	{ 0x3f8000, 0x3f800f, madmotor_control_r },
	{ -1 }  /* end of table */
};

static struct MemoryWriteAddress madmotor_writemem[] =
{
	{ 0x000000, 0x07ffff, MWA_ROM },
	{ 0x18c000, 0x18c001, MWA_NOP },

	{ 0x180000, 0x18001f, madmotor_pf1_control_w },
	{ 0x184000, 0x1847ff, madmotor_pf1_rowscroll_w, &madmotor_pf1_rowscroll },
	{ 0x188000, 0x189fff, madmotor_pf1_data_w, &madmotor_pf1_data },
	{ 0x190000, 0x19001f, madmotor_pf2_control_w },
	{ 0x198000, 0x1987ff, madmotor_pf2_data_w, &madmotor_pf2_data },
	{ 0x1a0000, 0x1a001f, madmotor_pf3_control_w },
	{ 0x1a4000, 0x1a4fff, madmotor_pf3_data_w, &madmotor_pf3_data },

	{ 0x3e0000, 0x3e3fff, MWA_BANK1, &madmotor_ram },
	{ 0x3e8000, 0x3e87ff, MWA_BANK2, &spriteram },
	{ 0x3f0000, 0x3f07ff, paletteram_xxxxBBBBGGGGRRRR_word_w, &paletteram },
	{ 0x3fc004, 0x3fc005, madmotor_sound_w },
	{ -1 }  /* end of table */
};

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

static void YM2151_w(int offset, int data)
{
	switch (offset) {
	case 0:
		YM2151_register_port_0_w(0,data);
		break;
	case 1:
		YM2151_data_port_0_w(0,data);
		break;
	}
}

static void YM2203_w(int offset, int data)
{
	switch (offset) {
	case 0:
		YM2203_control_port_0_w(0,data);
		break;
	case 1:
		YM2203_write_port_0_w(0,data);
		break;
	}
}

/* Physical memory map (21 bits) */
static struct MemoryReadAddress sound_readmem[] =
{
	{ 0x000000, 0x00ffff, MRA_ROM },
	{ 0x100000, 0x100001, YM2203_status_port_0_r },
	{ 0x110000, 0x110001, YM2151_status_port_0_r },
	{ 0x120000, 0x120001, OKIM6295_status_0_r },
	{ 0x130000, 0x130001, OKIM6295_status_1_r },
	{ 0x140000, 0x140001, soundlatch_r },
	{ 0x1f0000, 0x1f1fff, MRA_BANK8 },
	{ -1 }  /* end of table */
};

static struct MemoryWriteAddress sound_writemem[] =
{
	{ 0x000000, 0x00ffff, MWA_ROM },
	{ 0x100000, 0x100001, YM2203_w },
	{ 0x110000, 0x110001, YM2151_w },
	{ 0x120000, 0x120001, OKIM6295_data_0_w },
	{ 0x130000, 0x130001, OKIM6295_data_1_w },
	{ 0x1f0000, 0x1f1fff, MWA_BANK8 },
	{ 0x1fec00, 0x1fec01, H6280_timer_w },
	{ 0x1ff402, 0x1ff403, H6280_irq_status_w },
	{ -1 }  /* end of table */
};

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

INPUT_PORTS_START( madmotor_input_ports )
	PORT_START	/* Player 1 controls */
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP    | IPF_8WAY )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN  | IPF_8WAY )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT  | IPF_8WAY )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT | IPF_8WAY )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNUSED )	/* button 3 - unused */
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START1 )

	PORT_START	/* Player 2 controls */
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP    | IPF_8WAY | IPF_PLAYER2 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN  | IPF_8WAY | IPF_PLAYER2 )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT  | IPF_8WAY | IPF_PLAYER2 )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT | IPF_8WAY | IPF_PLAYER2 )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 | IPF_PLAYER2 )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON2 | IPF_PLAYER2 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNUSED )	/* button 3 - unused */
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_START2 )

	PORT_START	/* Credits */
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_COIN3 )
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_VBLANK )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )

	PORT_START	/* Dip switch bank 1 */
	PORT_DIPNAME( 0x07, 0x07, DEF_STR( Coin_A ) )
	PORT_DIPSETTING(    0x00, DEF_STR( 3C_1C ) )
	PORT_DIPSETTING(    0x01, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(    0x07, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x06, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING(    0x05, DEF_STR( 1C_3C ) )
	PORT_DIPSETTING(    0x04, DEF_STR( 1C_4C ) )
	PORT_DIPSETTING(    0x03, DEF_STR( 1C_5C ) )
	PORT_DIPSETTING(    0x02, DEF_STR( 1C_6C ) )
	PORT_DIPNAME( 0x38, 0x38, DEF_STR( Coin_B ) )
	PORT_DIPSETTING(    0x00, DEF_STR( 3C_1C ) )
	PORT_DIPSETTING(    0x08, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING(    0x38, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING(    0x30, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING(    0x28, DEF_STR( 1C_3C ) )
	PORT_DIPSETTING(    0x20, DEF_STR( 1C_4C ) )
	PORT_DIPSETTING(    0x18, DEF_STR( 1C_5C ) )
	PORT_DIPSETTING(    0x10, DEF_STR( 1C_6C ) )
	PORT_DIPNAME( 0x40, 0x40, DEF_STR( Flip_Screen ) )
	PORT_DIPSETTING(    0x40, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x80, 0x00, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x80, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )

	PORT_START	/* Dip switch bank 2 */
	PORT_DIPNAME( 0x03, 0x03, DEF_STR( Lives ) )
	PORT_DIPSETTING(    0x00, "2" )
	PORT_DIPSETTING(    0x03, "4" )
	PORT_DIPSETTING(    0x02, "4" ) /* One of these might be infinite lifes? */
	PORT_DIPSETTING(    0x01, "5" )
	PORT_DIPNAME( 0x0c, 0x0c, DEF_STR( Difficulty ) )
	PORT_DIPSETTING(    0x08, "Easy" )
	PORT_DIPSETTING(    0x0c, "Normal" )
	PORT_DIPSETTING(    0x04, "Hard" )
	PORT_DIPSETTING(    0x00, "Hardest" )
	PORT_DIPNAME( 0x10, 0x00, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x10, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x20, 0x00, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x20, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x40, 0x40, "Allow Continue" )
	PORT_DIPSETTING(    0x00, DEF_STR( No ) )
	PORT_DIPSETTING(    0x40, DEF_STR( Yes ) )
	PORT_DIPNAME( 0x80, 0x00, DEF_STR( Demo_Sounds ) )
	PORT_DIPSETTING(    0x80, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
INPUT_PORTS_END

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

static struct GfxLayout charlayout =
{
	8,8,	/* 8*8 chars */
	4096,
	4,		/* 4 bits per pixel  */
	{ 0x18000*8, 0x8000*8, 0x10000*8, 0x00000*8 },
	{ 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	/* every char takes 8 consecutive bytes */
};

static struct GfxLayout tilelayout =
{
	16,16,
	4096,
	4,
	{ 0x20000*8, 0x60000*8, 0x00000*8, 0x40000*8 },
	{ 16*8+0, 16*8+1, 16*8+2, 16*8+3, 16*8+4, 16*8+5, 16*8+6, 16*8+7,
			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, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
	16*16
};

static struct GfxLayout spritelayout =
{
	16,16,
	4096*2,
	4,
	{ 0xc0000*8, 0x80000*8, 0x40000*8, 0x00000*8 },
	{ 16*8+0, 16*8+1, 16*8+2, 16*8+3, 16*8+4, 16*8+5, 16*8+6, 16*8+7,
			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, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
	16*16
};

static struct GfxDecodeInfo gfxdecodeinfo[] =
{
	{ 1, 0x000000, &charlayout,     0, 16 },	/* Characters 8x8 */
	{ 1, 0x020000, &tilelayout,   512, 16 },	/* Tiles 16x16 */
	{ 1, 0x0a0000, &tilelayout,   768, 16 },	/* Tiles 16x16 */
	{ 1, 0x120000, &spritelayout, 256, 16 },	/* Sprites 16x16 */
	{ -1 } /* end of array */
};

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

static struct OKIM6295interface okim6295_interface =
{
	2,              /* 2 chips */
	{ 8055, 16110 },/* Frequency, not confirmed */
	{ 3, 4 },       /* memory regions 3 & 4 */
	{ 50, 22 }		/* Note!  Keep chip 1 (voices) louder than chip 2 */
};

static struct YM2203interface ym2203_interface =
{
	1,
	21470000/8,	/* Audio section crystal is 21.470 MHz */
	{ YM2203_VOL(24,40) },
	AY8910_DEFAULT_GAIN,
	{ 0 },
	{ 0 },
	{ 0 },
	{ 0 }
};

static void sound_irq(int state)
{
	cpu_set_irq_line(1,1,state); /* IRQ 2 */
}

static struct YM2151interface ym2151_interface =
{
	1,
	21470000/8, /* Audio section crystal is 21.470 MHz */
	{ YM3012_VOL(37,MIXER_PAN_LEFT,37,MIXER_PAN_RIGHT) },
	{ sound_irq }
};

static struct MachineDriver madmotor_machine_driver =
{
	/* basic machine hardware */
	{
	 	{
			CPU_M68000, /* Custom chip 59 */
			12000000, /* 24 MHz crystal */
			0,
			madmotor_readmem,madmotor_writemem,0,0,
			m68_level6_irq,1 /* VBL */
		},
		{
			CPU_H6280 | CPU_AUDIO_CPU, /* Custom chip 45 */
			8053000/2, /* Crystal near CPU is 8.053 MHz */
			2,
			sound_readmem,sound_writemem,0,0,
			ignore_interrupt,0
		}
	},
	60, DEFAULT_REAL_60HZ_VBLANK_DURATION, /* frames per second, vblank duration taken from Burger Time */
	1,	/* 1 CPU slice per frame - interleaving is forced when a sound command is written */
	0,

	/* video hardware */
	32*8, 32*8, { 0*8, 32*8-1, 1*8, 31*8-1 },

	gfxdecodeinfo,
	1024, 1024,
	0,

	VIDEO_TYPE_RASTER | VIDEO_MODIFIES_PALETTE | VIDEO_UPDATE_BEFORE_VBLANK,
	0,
	madmotor_vh_start,
	0,
	madmotor_vh_screenrefresh,

	/* sound hardware */
	0,0,0,0,
  	{
		{
			SOUND_YM2203,
			&ym2203_interface
		},
		{
			SOUND_YM2151_ALT,
			&ym2151_interface
		},
		{
			SOUND_OKIM6295,
			&okim6295_interface
		}
	}
};

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

ROM_START( madmotor_rom )
	ROM_REGION(0x80000) /* 68000 code */
	ROM_LOAD_EVEN( "02", 0x00000, 0x20000, 0x50b554e0 )
	ROM_LOAD_ODD ( "00", 0x00000, 0x20000, 0x2d6a1b3f )
	ROM_LOAD_EVEN( "03", 0x40000, 0x20000, 0x442a0a52 )
	ROM_LOAD_ODD ( "01", 0x40000, 0x20000, 0xe246876e )

	ROM_REGION_DISPOSE(0x220000) /* temporary space for graphics (disposed after conversion) */
	ROM_LOAD( "04",    0x000000, 0x10000, 0x833ca3ab )	/* chars */
	ROM_LOAD( "05",    0x010000, 0x10000, 0xa691fbfe )

	ROM_LOAD( "10",    0x060000, 0x10000, 0x9dbf482b )	/* tiles */
	ROM_CONTINUE(      0x080000, 0x10000 )
	ROM_LOAD( "11",    0x020000, 0x10000, 0x593c48a9 )
	ROM_CONTINUE(      0x040000, 0x10000 )

	ROM_LOAD( "06",    0x0e0000, 0x20000, 0x448850e5 )	/* tiles */
	ROM_LOAD( "07",    0x100000, 0x20000, 0xede4d141 )
	ROM_LOAD( "08",    0x0a0000, 0x20000, 0xc380e5e5 )
	ROM_LOAD( "09",    0x0c0000, 0x20000, 0x1ee3326a )

	ROM_LOAD( "15",    0x120000, 0x20000, 0x90ae9f74 )	/* sprites */
	ROM_LOAD( "16",    0x140000, 0x20000, 0xe96ac815 )
	ROM_LOAD( "17",    0x160000, 0x20000, 0xabad9a1b )
	ROM_LOAD( "18",    0x180000, 0x20000, 0x96d8d64b )
	ROM_LOAD( "19",    0x1a0000, 0x20000, 0xcbd8c9b8 )
	ROM_LOAD( "20",    0x1c0000, 0x20000, 0x47f706a8 )
	ROM_LOAD( "21",    0x1e0000, 0x20000, 0x9c72d364 )
	ROM_LOAD( "22",    0x200000, 0x20000, 0x1e78aa60 )

	ROM_REGION(0x10000)	/* Sound CPU */
	ROM_LOAD( "14",    0x00000, 0x10000, 0x1c28a7e5 )

	ROM_REGION(0x20000)	/* ADPCM samples */
	ROM_LOAD( "12",    0x00000, 0x20000, 0xc202d200 )

	ROM_REGION(0x20000)	/* ADPCM samples */
	ROM_LOAD( "13",    0x00000, 0x20000, 0xcc4d65e9 )
ROM_END

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

static void madmotor_decrypt(void)
{
	unsigned char *RAM = Machine->memory_region[0];
	int i;

	for (i=0x00000; i<0x80000; i++) {
		RAM[i]=(RAM[i] & 0xdb) | ((RAM[i] & 0x04) << 3) | ((RAM[i] & 0x20) >> 3);
		RAM[i]=(RAM[i] & 0x7e) | ((RAM[i] & 0x01) << 7) | ((RAM[i] & 0x80) >> 7);
	}
}

static int cycle_r(int offset)
{
	int ret=READ_WORD(&madmotor_ram[0]);

	if (cpu_get_pc()==0x646e && (ret&0x8000)==0x8000) {
		cpu_spinuntil_int();
		return 0;
	}

	return ret;
}

static void memory_handler(void)
{
	install_mem_read_handler(0, 0x3e0000, 0x3e0001, cycle_r);
}

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

struct GameDriver madmotor_driver =
{
	__FILE__,
	0,
	"madmotor",
	"Mad Motor",
	"1989", /* The title screen is undated, but it's (c) 1989 Data East at 0xefa0 */
	"[Data East] (Mitchell license)",
	"Bryan McPhail",
	0,
	&madmotor_machine_driver,
	memory_handler,

	madmotor_rom,
	madmotor_decrypt, 0,
	0,
	0,

	madmotor_input_ports,

	0, 0, 0,
	ORIENTATION_DEFAULT,
	0, 0
};
