text: // license:BSD-3-Clause
  // copyright-holders:David Haywood
  
  #include "machine/gen_latch.h"
  #include "machine/timer.h"
  #include "sound/okim6295.h"
  #include "screen.h"
  
  class shadfrce_state : public driver_device
  {
  public:
  	shadfrce_state(const machine_config &mconfig, device_type type, const char *tag)
  		: driver_device(mconfig, type, tag),
  		m_maincpu(*this, "maincpu"),
  		m_audiocpu(*this, "audiocpu"),
  		m_oki(*this, "oki"),
  		m_gfxdecode(*this, "gfxdecode"),
  		m_screen(*this, "screen"),
  		m_palette(*this, "palette"),
  		m_soundlatch(*this, "soundlatch"),
  		m_io_p1(*this, "P1"),
  		m_io_p2(*this, "P2"),
  		m_io_dsw1(*this, "DSW1"),
  		m_io_dsw2(*this, "DSW2"),
  		m_io_other(*this, "OTHER"),
  		m_io_extra(*this, "EXTRA"),
  		m_io_misc(*this, "MISC"),
  		m_io_system(*this, "SYSTEM"),
  		m_fgvideoram(*this, "fgvideoram"),
  		m_bg0videoram(*this, "bg0videoram"),
  		m_bg1videoram(*this, "bg1videoram"),
  		m_spvideoram(*this, "spvideoram") { }
  
  	required_device<cpu_device> m_maincpu;
  	required_device<cpu_device> m_audiocpu;
  	required_device<okim6295_device> m_oki;
  	required_device<gfxdecode_device> m_gfxdecode;
  	required_device<screen_device> m_screen;
  	required_device<palette_device> m_palette;
  	required_device<generic_latch_8_device> m_soundlatch;
  
  	required_ioport m_io_p1;
  	required_ioport m_io_p2;
  	required_ioport m_io_dsw1;
  	required_ioport m_io_dsw2;
  	required_ioport m_io_other;
  	required_ioport m_io_extra;
  	required_ioport m_io_misc;
  	required_ioport m_io_system;
  
  	required_shared_ptr<uint16_t> m_fgvideoram;
  	required_shared_ptr<uint16_t> m_bg0videoram;
  	required_shared_ptr<uint16_t> m_bg1videoram;
  	required_shared_ptr<uint16_t> m_spvideoram;
  
  	std::unique_ptr<uint16_t[]> m_spvideoram_old;
  	tilemap_t *m_fgtilemap;
  	tilemap_t *m_bg0tilemap;
  	tilemap_t *m_bg1tilemap;
  	int m_video_enable;
  	int m_irqs_enable;
  	int m_raster_scanline;
  	int m_raster_irq_enable;
  	int m_vblank;
  	int m_prev_value;
  
  	DECLARE_WRITE16_MEMBER(flip_screen);
  	DECLARE_READ16_MEMBER(input_ports_r);
  	DECLARE_WRITE8_MEMBER(screen_brt_w);
  	DECLARE_WRITE16_MEMBER(irq_ack_w);
  	DECLARE_WRITE16_MEMBER(irq_w);
  	DECLARE_WRITE16_MEMBER(scanline_w);
  	DECLARE_WRITE16_MEMBER(fgvideoram_w);
  	DECLARE_WRITE16_MEMBER(bg0videoram_w);
  	DECLARE_WRITE16_MEMBER(bg1videoram_w);
  	DECLARE_WRITE16_MEMBER(bg0scrollx_w);
  	DECLARE_WRITE16_MEMBER(bg0scrolly_w);
  	DECLARE_WRITE16_MEMBER(bg1scrollx_w);
  	DECLARE_WRITE16_MEMBER(bg1scrolly_w);
  	DECLARE_WRITE8_MEMBER(oki_bankswitch_w);
  
  	TILE_GET_INFO_MEMBER(get_fgtile_info);
  	TILE_GET_INFO_MEMBER(get_bg0tile_info);
  	TILE_GET_INFO_MEMBER(get_bg1tile_info);
  
  	virtual void video_start() override;
  
  	TIMER_DEVICE_CALLBACK_MEMBER(scanline);
  
  	uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
  	DECLARE_WRITE_LINE_MEMBER(screen_vblank);
  	void draw_sprites(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect );
  	void shadfrce(machine_config &config);
  	void shadfrce_map(address_map &map);
  	void shadfrce_sound_map(address_map &map);
  };
  