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

  Qwak (prototype) driver.

  This driver is based *extremely* loosely on the Centipede driver.

  The following memory map is pure speculation:

  0000-01FF     R/W		RAM
  0200-025F     R/W		RAM?  ER2055 NOVRAM maybe?
  0300-03FF     R/W		RAM
  0400-07BF		R/W		Video RAM
  07C0-07FF		R/W		Sprite RAM
  1000			W		???
  2000			W		???
  2001			W		???
  2003          W		Start LED 1
  2004          W		Start LED 2
  3000			R		$40 = !UP			$80 = unused?
  3001			R		$40 = !DOWN			$80 = ???
  3002			R		$40 = !LEFT			$80 = ???
  3003			R		$40 = !RIGHT		$80 = unused?
  3004			R		$40 = !START1		$80 = ???
  3005			R		$40 = !START2		$80 = !COIN
  3006			R		$40 = !BUTTON1		$80 = !COIN
  3007			R		$40 = unused?		$80 = !COIN
  4000          R		???
  6000-600F		R/W		Pokey 1
  7000-700F		R/W		Pokey 2
  8000-BFFF		R		ROM

  TODO:
	- fix colors
	- coins seem to count twice instead of once?
	- find DIP switches (should be at $4000, I would think)
	- figure out what $1000, $2000, and $2001 are used for
	- figure out exactly what the unknown bits in the $3000 area do


If you have any questions about how this driver works, don't hesitate to
ask.  - Mike Balfour (mab22@po.cwru.edu)
***************************************************************************/

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

void qwakprot_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh);
void qwakprot_paletteram_w (int offset, int data);


static void qwakprot_led_w(int offset,int data)
{
	osd_led_w(offset,~data >> 7);
}

static struct MemoryReadAddress readmem[] =
{
	{ 0x0000, 0x01ff, MRA_RAM },
	{ 0x0200, 0x025f, MRA_RAM },
	{ 0x0300, 0x03ff, MRA_RAM },
	{ 0x0400, 0x07ff, MRA_RAM },
	{ 0x3000, 0x3000, input_port_0_r },
	{ 0x3001, 0x3001, input_port_1_r },
	{ 0x3002, 0x3002, input_port_2_r },
	{ 0x3003, 0x3003, input_port_3_r },
	{ 0x3004, 0x3004, input_port_4_r },
	{ 0x3005, 0x3005, input_port_5_r },
	{ 0x3006, 0x3006, input_port_6_r },
	{ 0x3007, 0x3007, input_port_7_r },
	{ 0x4000, 0x4000, input_port_8_r },			/* just guessing */
	{ 0x6000, 0x600f, pokey1_r },
	{ 0x7000, 0x700f, pokey2_r },
	{ 0x8000, 0xbfff, MRA_ROM },
	{ 0xf000, 0xffff, MRA_ROM },	/* for the reset / interrupt vectors */
	{ -1 }	/* end of table */
};

static struct MemoryWriteAddress writemem[] =
{
	{ 0x0000, 0x01ff, MWA_RAM },
	{ 0x0200, 0x025f, MWA_RAM },
	{ 0x0300, 0x03ff, MWA_RAM },
	{ 0x0400, 0x07bf, videoram_w, &videoram, &videoram_size },
	{ 0x07c0, 0x07ff, MWA_RAM, &spriteram },
	{ 0x1c00, 0x1c0f, qwakprot_paletteram_w, &paletteram }, /* just guessing */
	{ 0x2003, 0x2004, qwakprot_led_w },
	{ 0x6000, 0x600f, pokey1_w },
	{ 0x7000, 0x700f, pokey2_w },
	{ 0x8000, 0xbfff, MWA_ROM },
	{ -1 }	/* end of table */
};



INPUT_PORTS_START( input_ports )
	PORT_START	/* IN0 */
	PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_JOYSTICK_UP )
	PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )			/* ??? */

	PORT_START      /* IN1 */
	PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN )
	PORT_BIT ( 0x80, IP_ACTIVE_HIGH, IPT_VBLANK )			/* ??? */

	PORT_START      /* IN2 */
	PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT )
	PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_VBLANK )			/* ??? */

	PORT_START      /* IN3 */
	PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT )
	PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )			/* ??? */

	PORT_START      /* IN4 */
	PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_UNKNOWN )			/* ??? */

	PORT_START      /* IN5 */
	PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_START2 )
	PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_COIN1 )

	PORT_START      /* IN6 */
	PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_BUTTON1 )
	PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_COIN2 )

	PORT_START      /* IN7 */
	PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )			/* ??? */
	PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_COIN3 )

	PORT_START      /* IN8 */
	PORT_DIPNAME( 0x01, 0x00, "DIP 1", IP_KEY_NONE )
	PORT_DIPSETTING(    0x00, "on" )
	PORT_DIPSETTING(    0x01, "off" )
	PORT_DIPNAME( 0x02, 0x00, "DIP 2", IP_KEY_NONE )
	PORT_DIPSETTING(    0x00, "on" )
	PORT_DIPSETTING(    0x02, "off" )
	PORT_DIPNAME( 0x04, 0x00, "DIP 3", IP_KEY_NONE )
	PORT_DIPSETTING(    0x00, "on" )
	PORT_DIPSETTING(    0x04, "off" )
	PORT_DIPNAME( 0x08, 0x00, "DIP 4", IP_KEY_NONE )
	PORT_DIPSETTING(    0x00, "on" )
	PORT_DIPSETTING(    0x08, "off" )
	PORT_DIPNAME( 0x10, 0x00, "DIP 5", IP_KEY_NONE )
	PORT_DIPSETTING(    0x00, "on" )
	PORT_DIPSETTING(    0x10, "off" )
	PORT_DIPNAME( 0x20, 0x00, "DIP 6", IP_KEY_NONE )
	PORT_DIPSETTING(    0x00, "on" )
	PORT_DIPSETTING(    0x20, "off" )
	PORT_DIPNAME( 0x40, 0x00, "DIP 7", IP_KEY_NONE )
	PORT_DIPSETTING(    0x00, "on" )
	PORT_DIPSETTING(    0x40, "off" )
	PORT_DIPNAME( 0x80, 0x00, "DIP 8", IP_KEY_NONE )
	PORT_DIPSETTING(    0x00, "on" )
	PORT_DIPSETTING(    0x80, "off" )

INPUT_PORTS_END

static struct GfxLayout charlayout =
{
	8,8,	/* 8*8 characters */
	128,	/* 128 characters */
	4,	/* 4 bits per pixel */
	{ 0x3000*8, 0x2000*8, 0x1000*8, 0 },	/* the four bitplanes are separated */
	{ 0, 1, 2, 3, 4, 5, 6, 7 },
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 },
	16*8	/* every char takes 8 consecutive bytes, then skip 8 */
};

static struct GfxLayout spritelayout =
{
	8,16,	/* 16*8 sprites */
	128,	/* 128 sprites */
	4,	/* 4 bits per pixel */
	{ 0x3000*8, 0x2000*8, 0x1000*8, 0 },	/* the four bitplanes are separated */
	{ 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*8	/* every sprite takes 16 consecutive bytes */
};


static struct GfxDecodeInfo gfxdecodeinfo[] =
{
	{ 1, 0x0800, &charlayout,   0, 1 },
	{ 1, 0x0808, &charlayout,   0, 1 },
	{ 1, 0x0000, &spritelayout, 0, 1 },
	{ -1 } /* end of array */
};



static struct POKEYinterface pokey_interface =
{
	2,	/* 2 chips */
	1500000,	/* 1.5 MHz??? */
	50,
	POKEY_DEFAULT_GAIN,
	NO_CLIP,
	/* The 8 pot handlers */
	{ 0, 0 },
	{ 0, 0 },
	{ 0, 0 },
	{ 0, 0 },
	{ 0, 0 },
	{ 0, 0 },
	{ 0, 0 },
	{ 0, 0 },
	/* The allpot handler */
	{ 0, 0 },
};


static struct MachineDriver machine_driver =
{
	/* basic machine hardware */
	{
		{
			CPU_M6502,
			12096000/8,	/* 1.512 Mhz?? */
			0,
			readmem,writemem,0,0,
			interrupt,4
		}
	},
	60, 1460,	/* frames per second, vblank duration??? */
	1,	/* single CPU, no need for interleaving */
	0,

	/* video hardware */
	32*8, 32*8, { 0*8, 32*8-1, 0*8, 30*8-1 },
	gfxdecodeinfo,
	16, 16,
	0,

	VIDEO_TYPE_RASTER|VIDEO_SUPPORTS_DIRTY|VIDEO_MODIFIES_PALETTE,
	0,
	generic_vh_start,
	generic_vh_stop,
	qwakprot_vh_screenrefresh,

	/* sound hardware */
	0,0,0,0,
	{
		{
			SOUND_POKEY,
			&pokey_interface
		}
	}
};


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

  Game ROMs

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

ROM_START( qwakprot_rom )
	ROM_REGION(0x10000)	/* 64k for code */
	ROM_LOAD( "qwak8000.bin", 0x8000, 0x1000, 0x4d002d8a )
	ROM_LOAD( "qwak9000.bin", 0x9000, 0x1000, 0xe0c78fd7 )
	ROM_LOAD( "qwaka000.bin", 0xa000, 0x1000, 0xe5770fc9 )
	ROM_LOAD( "qwakb000.bin", 0xb000, 0x1000, 0x90771cc0 )
	ROM_RELOAD(               0xf000, 0x1000 )	/* for the reset and interrupt vectors */

	ROM_REGION(0x4000)	/* temporary space for graphics (disposed after conversion) */
	ROM_LOAD( "qwakgfx0.bin", 0x0000, 0x1000, 0xbed2c067 )
	ROM_LOAD( "qwakgfx1.bin", 0x1000, 0x1000, 0x73a31d28 )
	ROM_LOAD( "qwakgfx2.bin", 0x2000, 0x1000, 0x07fd9e80 )
	ROM_LOAD( "qwakgfx3.bin", 0x3000, 0x1000, 0xe8416f2b )
ROM_END

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

  Hi Score Routines

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

static int hiload(void)
{
	unsigned char *RAM = Machine->memory_region[Machine->drv->cpu[0].memory_region];

	/* check if the hi score table has already been initialized */
	if ((memcmp(&RAM[0x0045],"\x00\x50\x00",3) == 0) &&
		(memcmp(&RAM[0x0108],"MEC",3) == 0))
	{
		void *f;

		if ((f = osd_fopen(Machine->gamedrv->name,0,OSD_FILETYPE_HIGHSCORE,0)) != 0)
		{
			osd_fread(f,&RAM[0x0045],3);	/* Hi score */
			osd_fread(f,&RAM[0x0108],3);	/* Initials */
			osd_fclose(f);
		}

		return 1;
	}
	else return 0;	/* we can't load the hi scores yet */
}

static void hisave(void)
{
	void *f;
	unsigned char *RAM = Machine->memory_region[Machine->drv->cpu[0].memory_region];

	if ((f = osd_fopen(Machine->gamedrv->name,0,OSD_FILETYPE_HIGHSCORE,1)) != 0)
	{
		osd_fwrite(f,&RAM[0x0045],3);	/* Score */
		osd_fwrite(f,&RAM[0x0108],3);	/* Initials */
		osd_fclose(f);
	}
}

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

  Game driver(s)

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

struct GameDriver qwakprot_driver =
{
	__FILE__,
	0,
	"qwakprot",
	"Qwak (prototype)",
	"1982",
	"Atari",
	"Mike Balfour",
	0,
	&machine_driver,
	0,

	qwakprot_rom,
	0, 0,
	0,
	0,	/* sound_prom */

	input_ports,

	0, 0, 0,
	ORIENTATION_ROTATE_270,

	hiload, hisave
};