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

Atari Destroyer Driver

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

#include "driver.h"

extern VIDEO_UPDATE( destroyr );

extern int destroyr_wavemod;
extern int destroyr_cursor;

extern UINT8* destroyr_major_obj_ram;
extern UINT8* destroyr_minor_obj_ram;
extern UINT8* destroyr_alpha_num_ram;

static int destroyr_potmask[2];
static int destroyr_potsense[2];
static int destroyr_attract;
static int destroyr_motor_speed;
static int destroyr_noise;


static void destroyr_dial_callback(int dial)
{
	/* Analog inputs come from the player's depth control potentiometer.
       The voltage is compared to a voltage ramp provided by a discrete
       analog circuit that conditions the VBLANK signal. When the ramp
       voltage exceeds the input voltage an NMI signal is generated. The
       computer then reads the VSYNC data functions to tell where the
       cursor should be located. */

	destroyr_potsense[dial] = 1;

	if (destroyr_potmask[dial])
	{
		cpunum_set_input_line(0, INPUT_LINE_NMI, PULSE_LINE);
	}
}


static void destroyr_frame_callback(int dummy)
{
	destroyr_potsense[0] = 0;
	destroyr_potsense[1] = 0;

	/* PCB supports two dials, but cab has only got one */

	timer_set(cpu_getscanlinetime(readinputport(3)), 0, destroyr_dial_callback);
}


static MACHINE_INIT( destroyr )
{
	timer_pulse(cpu_getscanlinetime(0), 0, destroyr_frame_callback);
}


WRITE8_HANDLER( destroyr_misc_w )
{
	/* bits 0 to 2 connect to the sound circuits */

	destroyr_attract = data & 1;
	destroyr_noise = data & 2;
	destroyr_motor_speed = data & 4;
	destroyr_potmask[0] = data & 8;
	destroyr_wavemod = data & 16;
	destroyr_potmask[1] = data & 32;

	coin_lockout_w(0, !destroyr_attract);
	coin_lockout_w(1, !destroyr_attract);
}


WRITE8_HANDLER( destroyr_cursor_load_w )
{
	destroyr_cursor = data;

	watchdog_reset_w(offset, data);
}


WRITE8_HANDLER( destroyr_interrupt_ack_w )
{
	cpunum_set_input_line(0, 0, CLEAR_LINE);
}


WRITE8_HANDLER( destroyr_output_w )
{
	offset &= 15;

	switch (offset)
	{
	case 0:
		set_led_status(0, data & 1);
		break;
	case 1:
		set_led_status(1, data & 1); /* no second LED present on cab */
		break;
	case 2:
		/* bit 0 => songate */
		break;
	case 3:
		/* bit 0 => launch */
		break;
	case 4:
		/* bit 0 => explosion */
		break;
	case 5:
		/* bit 0 => sonar */
		break;
	case 6:
		/* bit 0 => high explosion */
		break;
	case 7:
		/* bit 0 => low explosion */
		break;
	case 8:
		destroyr_misc_w(offset, data);
		break;
	default:
		logerror("unmapped output port %d\n", offset);
		break;
	}
}


READ8_HANDLER( destroyr_input_r )
{
	offset &= 15;

	if (offset == 0)
	{
		UINT8 ret = readinputport(0);

		if (destroyr_potsense[0] && destroyr_potmask[0])
			ret |= 4;
		if (destroyr_potsense[1] && destroyr_potmask[1])
			ret |= 8;

		return ret;
	}

	if (offset == 1)
	{
		return readinputport(1);
	}

	logerror("unmapped input port %d\n", offset);

	return 0;
}


READ8_HANDLER( destroyr_scanline_r )
{
	return cpu_getscanline();
}


static ADDRESS_MAP_START( destroyr_map, ADDRESS_SPACE_PROGRAM, 8 )
	ADDRESS_MAP_FLAGS( AMEF_ABITS(15) )
	AM_RANGE(0x0000, 0x00ff) AM_MIRROR(0xf00) AM_RAM
	AM_RANGE(0x1000, 0x1fff) AM_READWRITE(destroyr_input_r, destroyr_output_w)
	AM_RANGE(0x2000, 0x2fff) AM_READ(input_port_2_r)
	AM_RANGE(0x3000, 0x30ff) AM_WRITE(MWA8_RAM) AM_BASE(&destroyr_alpha_num_ram)
	AM_RANGE(0x4000, 0x401f) AM_WRITE(MWA8_RAM) AM_BASE(&destroyr_major_obj_ram)
	AM_RANGE(0x5000, 0x5000) AM_WRITE(destroyr_cursor_load_w)
	AM_RANGE(0x5001, 0x5001) AM_WRITE(destroyr_interrupt_ack_w)
	AM_RANGE(0x5002, 0x5007) AM_WRITE(MWA8_RAM) AM_BASE(&destroyr_minor_obj_ram)
	AM_RANGE(0x6000, 0x6fff) AM_READ(destroyr_scanline_r)
	AM_RANGE(0x7000, 0x77ff) AM_NOP				/* missing translation ROMs */
	AM_RANGE(0x7800, 0x7fff) AM_ROM				/* program */
ADDRESS_MAP_END


INPUT_PORTS_START( destroyr )
	PORT_START /* IN0 */
	PORT_BIT( 0x01, IP_ACTIVE_LOW,  IPT_UNUSED ) /* call 7400 */
	PORT_BIT( 0x02, IP_ACTIVE_LOW,  IPT_UNUSED )
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNUSED ) /* potsense1 */
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNUSED ) /* potsense2 */
	PORT_BIT( 0x10, IP_ACTIVE_LOW,  IPT_START1 )
	PORT_BIT( 0x20, IP_ACTIVE_LOW,  IPT_START2 )
	PORT_DIPNAME( 0xc0, 0x80, "Extended Play" )
	PORT_DIPSETTING( 0x40, "1500 points" )
	PORT_DIPSETTING( 0x80, "2500 points" )
	PORT_DIPSETTING( 0xc0, "3500 points" )
	PORT_DIPSETTING( 0x00, "never" )

	PORT_START /* IN1 */
	PORT_BIT( 0x01, IP_ACTIVE_LOW,  IPT_TILT )
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_BUTTON2 ) /* actually a lever */
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_BUTTON1 )
	PORT_SERVICE( 0x08, IP_ACTIVE_LOW )
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_COIN1 )
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_COIN2 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW,  IPT_UNUSED )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_VBLANK )

	PORT_START /* IN2 */
	PORT_DIPNAME( 0x03, 0x02, DEF_STR( Coinage ) )
	PORT_DIPSETTING( 0x03, DEF_STR( 2C_1C ) )
	PORT_DIPSETTING( 0x02, DEF_STR( 1C_1C ) )
	PORT_DIPSETTING( 0x01, DEF_STR( 1C_2C ) )
	PORT_DIPSETTING( 0x00, DEF_STR( Free_Play ) )
	PORT_DIPNAME( 0x0c, 0x08, "Play Time" )
	PORT_DIPSETTING( 0x00, "50 seconds" )
	PORT_DIPSETTING( 0x04, "75 seconds" )
	PORT_DIPSETTING( 0x08, "100 seconds" )
	PORT_DIPSETTING( 0x0c, "125 seconds" )
	PORT_DIPNAME( 0x30, 0x00, DEF_STR( Language ) ) /* requires translation ROMs */
	PORT_DIPSETTING( 0x30, DEF_STR( German ) )
	PORT_DIPSETTING( 0x20, DEF_STR( French ) )
	PORT_DIPSETTING( 0x10, DEF_STR( Spanish ) )
	PORT_DIPSETTING( 0x00, DEF_STR( English ) )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START /* IN3 */
	PORT_BIT( 0xff, 0x00, IPT_PADDLE_V ) PORT_MINMAX(0,160) PORT_SENSITIVITY(30) PORT_KEYDELTA(10) PORT_CENTERDELTA(0) PORT_REVERSE
INPUT_PORTS_END


static struct GfxLayout destroyr_alpha_num_layout =
{
	8, 8,     /* width, height */
	64,       /* total         */
	1,        /* planes        */
	{ 0 },    /* plane offsets */
	{
		0x4, 0x5, 0x6, 0x7, 0xC, 0xD, 0xE, 0xF
	},
	{
		0x00, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x70
	},
	0x80      /* increment */
};


static struct GfxLayout destroyr_minor_object_layout =
{
	16, 16,   /* width, height */
	16,       /* total         */
	1,        /* planes        */
	{ 0 },    /* plane offsets */
	{
	  0x04, 0x05, 0x06, 0x07, 0x0C, 0x0D, 0x0E, 0x0F,
	  0x14, 0x15, 0x16, 0x17, 0x1C, 0x1D, 0x1E, 0x1F
	},
	{
	  0x000, 0x020, 0x040, 0x060, 0x080, 0x0a0, 0x0c0, 0x0e0,
	  0x100, 0x120, 0x140, 0x160, 0x180, 0x1a0, 0x1c0, 0x1e0
	},
	0x200     /* increment */
};


static struct GfxLayout destroyr_major_object_layout =
{
	64, 16,   /* width, height */
	4,        /* total         */
	2,        /* planes        */
	{ 1, 0 }, /* plane offsets */
	{
	  0x00, 0x02, 0x04, 0x06, 0x08, 0x0A, 0x0C, 0x0E,
	  0x10, 0x12, 0x14, 0x16, 0x18, 0x1A, 0x1C, 0x1E,
	  0x20, 0x22, 0x24, 0x26, 0x28, 0x2A, 0x2C, 0x2E,
	  0x30, 0x32, 0x34, 0x36, 0x38, 0x3A, 0x3C, 0x3E,
	  0x40, 0x42, 0x44, 0x46, 0x48, 0x4A, 0x4C, 0x4E,
	  0x50, 0x52, 0x54, 0x56, 0x58, 0x5A, 0x5C, 0x5E,
	  0x60, 0x62, 0x64, 0x66, 0x68, 0x6A, 0x6C, 0x6E,
	  0x70, 0x72, 0x74, 0x76, 0x78, 0x7A, 0x7C, 0x7E
	},
	{
	  0x000, 0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380,
	  0x400, 0x480, 0x500, 0x580, 0x600, 0x680, 0x700, 0x780
	},
	0x0800     /* increment */
};


static struct GfxLayout destroyr_waves_layout =
{
	64, 2,    /* width, height */
	2,        /* total         */
	1,        /* planes        */
	{ 0 },    /* plane offsets */
	{
	  0x00, 0x01, 0x02, 0x03, 0x08, 0x09, 0x0A, 0x0B,
	  0x10, 0x11, 0x12, 0x13, 0x18, 0x19, 0x1A, 0x1B,
	  0x20, 0x21, 0x22, 0x23, 0x28, 0x29, 0x2A, 0x2B,
	  0x30, 0x31, 0x32, 0x33, 0x38, 0x39, 0x3A, 0x3B,
	  0x40, 0x41, 0x42, 0x43, 0x48, 0x49, 0x4A, 0x4B,
	  0x50, 0x51, 0x52, 0x53, 0x58, 0x59, 0x5A, 0x5B,
	  0x60, 0x61, 0x62, 0x63, 0x68, 0x69, 0x6A, 0x6B,
	  0x70, 0x71, 0x72, 0x73, 0x78, 0x79, 0x7A, 0x7B
	},
	{
	  0x00, 0x80
	},
	0x04     /* increment */
};


static struct GfxDecodeInfo destroyr_gfx_decode_info[] =
{
	{ REGION_GFX1, 0, &destroyr_alpha_num_layout, 4, 1 },
	{ REGION_GFX2, 0, &destroyr_minor_object_layout, 4, 1 },
	{ REGION_GFX3, 0, &destroyr_major_object_layout, 0, 1 },
	{ REGION_GFX4, 0, &destroyr_waves_layout, 4, 1 },
	{ -1 } /* end of array */
};


static PALETTE_INIT( destroyr )
{
	palette_set_color(0, 0x00, 0x00, 0x00);   /* major objects */
	palette_set_color(1, 0x50, 0x50, 0x50);
	palette_set_color(2, 0xAF, 0xAF, 0xAF);
	palette_set_color(3, 0xFF ,0xFF, 0xFF);
	palette_set_color(4, 0x00, 0x00, 0x00);   /* alpha numerics, waves, minor objects */
	palette_set_color(5, 0xFF, 0xFF, 0xFF);
	palette_set_color(6, 0x00, 0x00, 0x00);   /* cursor */
	palette_set_color(7, 0x78, 0x78, 0x78);
}


static MACHINE_DRIVER_START( destroyr )

	/* basic machine hardware */
	MDRV_CPU_ADD(M6800, 12096000 / 16)
	MDRV_CPU_PROGRAM_MAP(destroyr_map, 0)
	MDRV_CPU_VBLANK_INT(irq0_line_assert, 4)

	MDRV_FRAMES_PER_SECOND(60)
	MDRV_VBLANK_DURATION((int) ((22. * 1000000) / (262. * 60) + 0.5))

	MDRV_MACHINE_INIT(destroyr)

	/* video hardware */
	MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER)
	MDRV_SCREEN_SIZE(256, 240)
	MDRV_VISIBLE_AREA(0, 255, 0, 239)
	MDRV_GFXDECODE(destroyr_gfx_decode_info)
	MDRV_PALETTE_LENGTH(8)
	MDRV_PALETTE_INIT(destroyr)
	MDRV_VIDEO_UPDATE(destroyr)

	/* sound hardware */
MACHINE_DRIVER_END


ROM_START( destroyr )
	ROM_REGION( 0x8000, REGION_CPU1, 0 )                  /* program code */
	ROM_LOAD( "30146-01.c3", 0x7800, 0x0800, CRC(e560c712) SHA1(0505ab57eee5421b4ff4e87d14505e02b18fd54c) )

	ROM_REGION( 0x0400, REGION_GFX1, ROMREGION_DISPOSE )   /* alpha numerics */
	ROM_LOAD( "30135-01.p4", 0x0000, 0x0400, CRC(184824cf) SHA1(713cfd1d41ef7b1c345ea0038b652c4ba3f08301) )

	ROM_REGION( 0x0400, REGION_GFX2, ROMREGION_DISPOSE )   /* minor objects */
	ROM_LOAD( "30132-01.f4", 0x0000, 0x0400, CRC(e09d3d55) SHA1(b26013397ef2cb32d0416ecb118387b9c2dffa9a) )

	ROM_REGION( 0x0400, REGION_GFX3, ROMREGION_DISPOSE )   /* major objects */
	ROM_LOAD_NIB_HIGH( "30134-01.p8", 0x0000, 0x0400, CRC(6259e007) SHA1(049f5f7160305cb4f4b499dd113cb11eea73fc95) )
	ROM_LOAD_NIB_LOW ( "30133-01.n8", 0x0000, 0x0400, CRC(108d3e2c) SHA1(8c993369d37c6713670483af78e6d04d38f4b4fc) )

	ROM_REGION( 0x0020, REGION_GFX4, ROMREGION_DISPOSE )   /* waves */
	ROM_LOAD( "30136-01.k2", 0x0000, 0x0020, CRC(532c11b1) SHA1(18ab5369a3f2cfcc9a44f38fa8649524bea5b203) )

	ROM_REGION( 0x0100, REGION_USER1, 0 )                  /* sync (unused) */
	ROM_LOAD( "30131-01.m1", 0x0000, 0x0100, CRC(b8094b4c) SHA1(82dc6799a19984f3b204ee3aeeb007e55afc8be3) )
ROM_END


GAMEX( 1977, destroyr, 0, destroyr, destroyr, 0, ORIENTATION_FLIP_X, "Atari", "Destroyer", GAME_NO_SOUND )
