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

    TX-1/Buggy Boy hardware

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

#include "devlegcy.h"

#define TX1_PIXEL_CLOCK		(XTAL_18MHz / 3)
#define TX1_HBSTART			256
#define TX1_HBEND			0
#define TX1_HTOTAL			384
#define TX1_VBSTART			240
#define TX1_VBEND			0
#define TX1_VTOTAL			264

/*
 * HACK! Increased VTOTAL to 'fix' a timing issue
 * that prevents one of the start countdown tones
 * from playing.
 */
#define BB_PIXEL_CLOCK		(XTAL_18MHz / 3)
#define BB_HBSTART			256
#define BB_HBEND			0
#define BB_HTOTAL			384
#define BB_VBSTART			240
#define BB_VBEND			0
#define BB_VTOTAL			288 + 1

#define CPU_MASTER_CLOCK	(XTAL_15MHz)
#define BUGGYBOY_ZCLK		(CPU_MASTER_CLOCK / 2)

struct math_t
{
	UINT16	cpulatch;
	UINT16	promaddr;
	UINT16	inslatch;
	UINT32	mux;
	UINT16	ppshift;
	UINT32	i0ff;

	UINT16	retval;

	UINT16  muxlatch;	// TX-1

	int dbgaddr;
	int dbgpc;
};

/*
    SN74S516 16x16 Multiplier/Divider
*/
struct sn74s516_t
{
	INT16	X;
	INT16	Y;

	union
	{
	#ifdef LSB_FIRST
		struct { UINT16 W; INT16 Z; };
	#else
		struct { INT16 Z; UINT16 W; };
	#endif
		INT32 ZW32;
	} ZW;

	int		code;
	int		state;
	int		ZWfl;
};

struct vregs_t
{
	UINT16	scol;		/* Road colours */
	UINT32  slock;		/* Scroll lock */
	UINT8	flags;		/* Road flags */

	UINT32	ba_val;		/* Accumulator */
	UINT32	ba_inc;
	UINT32	bank_mode;

	UINT16	h_val;		/* Accumulator */
	UINT16	h_inc;
	UINT16	h_init;

	UINT8	slin_val;	/* Accumulator */
	UINT8	slin_inc;

	/* Buggyboy only */
	UINT8	wa8;
	UINT8	wa4;

	UINT16	wave_lfsr;
	UINT8	sky;
	UINT16	gas;
	UINT8	shift;
};


class tx1_state : public driver_device
{
public:
	tx1_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		  m_z80_ram(*this, "z80_ram"),
		  m_math_ram(*this, "math_ram"),
		  m_vram(*this, "vram"),
		  m_objram(*this, "objram"),
		  m_rcram(*this, "rcram") { }

	math_t m_math;
	sn74s516_t m_sn74s516;
	required_shared_ptr<UINT8> m_z80_ram;
	UINT8 m_ppi_latch_a;
	UINT8 m_ppi_latch_b;
	UINT32 m_ts;
	required_shared_ptr<UINT16> m_math_ram;
	vregs_t m_vregs;
	required_shared_ptr<UINT16> m_vram;
	required_shared_ptr<UINT16> m_objram;
	required_shared_ptr<UINT16> m_rcram;
	emu_timer *m_interrupt_timer;
	UINT8 *m_chr_bmp;
	UINT8 *m_obj_bmp;
	UINT8 *m_rod_bmp;
	bitmap_ind16 *m_bitmap;
	DECLARE_READ16_MEMBER(tx1_math_r);
	DECLARE_WRITE16_MEMBER(tx1_math_w);
	DECLARE_READ16_MEMBER(tx1_spcs_rom_r);
	DECLARE_READ16_MEMBER(tx1_spcs_ram_r);
	DECLARE_WRITE16_MEMBER(tx1_spcs_ram_w);
	DECLARE_READ16_MEMBER(buggyboy_math_r);
	DECLARE_WRITE16_MEMBER(buggyboy_math_w);
	DECLARE_READ16_MEMBER(buggyboy_spcs_rom_r);
	DECLARE_WRITE16_MEMBER(buggyboy_spcs_ram_w);
	DECLARE_READ16_MEMBER(buggyboy_spcs_ram_r);
	DECLARE_READ16_MEMBER(tx1_crtc_r);
	DECLARE_WRITE16_MEMBER(tx1_crtc_w);
	DECLARE_WRITE16_MEMBER(tx1_bankcs_w);
	DECLARE_WRITE16_MEMBER(tx1_slincs_w);
	DECLARE_WRITE16_MEMBER(tx1_slock_w);
	DECLARE_WRITE16_MEMBER(tx1_scolst_w);
	DECLARE_WRITE16_MEMBER(tx1_flgcs_w);
	DECLARE_WRITE16_MEMBER(buggyboy_gas_w);
	DECLARE_WRITE16_MEMBER(buggyboy_sky_w);
	DECLARE_WRITE16_MEMBER(buggyboy_scolst_w);
	DECLARE_WRITE16_MEMBER(z80_busreq_w);
	DECLARE_WRITE16_MEMBER(resume_math_w);
	DECLARE_WRITE16_MEMBER(halt_math_w);
	DECLARE_WRITE8_MEMBER(z80_intreq_w);
	DECLARE_READ16_MEMBER(z80_shared_r);
	DECLARE_WRITE16_MEMBER(z80_shared_w);
	DECLARE_READ16_MEMBER(dipswitches_r);
	DECLARE_WRITE8_MEMBER(ts_w);
	DECLARE_READ8_MEMBER(ts_r);
	DECLARE_WRITE8_MEMBER(tx1_ppi_latch_w);
	DECLARE_READ8_MEMBER(bb_analog_r);
	DECLARE_READ8_MEMBER(bbjr_analog_r);
	DECLARE_WRITE8_MEMBER(tx1_coin_cnt_w);
	DECLARE_WRITE8_MEMBER(bb_coin_cnt_w);
	DECLARE_READ8_MEMBER(tx1_ppi_porta_r);
	DECLARE_READ8_MEMBER(tx1_ppi_portb_r);
	DECLARE_MACHINE_RESET(tx1);
	DECLARE_VIDEO_START(tx1);
	DECLARE_PALETTE_INIT(tx1);
	DECLARE_MACHINE_RESET(buggyboy);
	DECLARE_VIDEO_START(buggyboy);
	DECLARE_PALETTE_INIT(buggyboy);
	DECLARE_VIDEO_START(buggybjr);
	UINT32 screen_update_tx1_left(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	UINT32 screen_update_tx1_middle(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	UINT32 screen_update_tx1_right(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	UINT32 screen_update_buggyboy_left(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	UINT32 screen_update_buggyboy_middle(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	UINT32 screen_update_buggyboy_right(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	UINT32 screen_update_buggybjr(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	void screen_eof_tx1(screen_device &screen, bool state);
	void screen_eof_buggyboy(screen_device &screen, bool state);
};

/*----------- defined in audio/tx1.c -----------*/
DECLARE_READ8_DEVICE_HANDLER( tx1_pit8253_r );
DECLARE_WRITE8_DEVICE_HANDLER( tx1_pit8253_w );

DECLARE_WRITE8_DEVICE_HANDLER( bb_ym1_a_w );
DECLARE_WRITE8_DEVICE_HANDLER( bb_ym2_a_w );
DECLARE_WRITE8_DEVICE_HANDLER( bb_ym2_b_w );


DECLARE_WRITE8_DEVICE_HANDLER( tx1_ay8910_a_w );
DECLARE_WRITE8_DEVICE_HANDLER( tx1_ay8910_b_w );

class tx1_sound_device : public device_t,
                         public device_sound_interface
{
public:
	tx1_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
	tx1_sound_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock);
	~tx1_sound_device() { global_free(m_token); }

	// access to legacy token
	void *token() const { assert(m_token != NULL); return m_token; }
protected:
	// device-level overrides
	virtual void device_config_complete();
	virtual void device_start();
	virtual void device_reset();

	// sound stream update overrides
	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples);
private:
	// internal state
	void *m_token;
};

extern const device_type TX1;

class buggyboy_sound_device : public tx1_sound_device
{
public:
	buggyboy_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
protected:
	// device-level overrides
	virtual void device_config_complete();
	virtual void device_start();
	virtual void device_reset();

	// sound stream update overrides
	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples);
private:
	// internal state
};

extern const device_type BUGGYBOY;