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

    Gun.Smoke

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

class gunsmoke_state : public driver_device
{
public:
	gunsmoke_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag) ,
		m_videoram(*this, "videoram"),
		m_colorram(*this, "colorram"),
		m_scrollx(*this, "scrollx"),
		m_scrolly(*this, "scrolly"),
		m_spriteram(*this, "spriteram"){ }

	/* memory pointers */
	required_shared_ptr<UINT8> m_videoram;
	required_shared_ptr<UINT8> m_colorram;
	required_shared_ptr<UINT8> m_scrollx;
	required_shared_ptr<UINT8> m_scrolly;
	required_shared_ptr<UINT8> m_spriteram;

	/* video-related */
	tilemap_t    *m_bg_tilemap;
	tilemap_t    *m_fg_tilemap;
	UINT8      m_chon;
	UINT8      m_objon;
	UINT8      m_bgon;
	UINT8      m_sprite3bank;
	DECLARE_READ8_MEMBER(gunsmoke_protection_r);
	DECLARE_WRITE8_MEMBER(gunsmoke_videoram_w);
	DECLARE_WRITE8_MEMBER(gunsmoke_colorram_w);
	DECLARE_WRITE8_MEMBER(gunsmoke_c804_w);
	DECLARE_WRITE8_MEMBER(gunsmoke_d806_w);
	TILE_GET_INFO_MEMBER(get_bg_tile_info);
	TILE_GET_INFO_MEMBER(get_fg_tile_info);
	virtual void machine_start();
	virtual void machine_reset();
	virtual void video_start();
	virtual void palette_init();
	UINT32 screen_update_gunsmoke(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	void draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect );
};