k051960: start adding irq/firq/nmi callback support

src/mame/video/k051960.c

@@ -128,12 +128,17 @@ k051960_device::k051960_device(const machine_config &mconfig, const char *tag, d
 	: device_t(mconfig, K051960, "K051960 Sprite Generator", tag, owner, clock, "k051960", __FILE__),
 	device_gfx_interface(mconfig, *this, gfxinfo),
 	m_ram(NULL),
+	m_screen_tag(NULL),
+	m_irq_handler(*this),
+	m_firq_handler(*this),
+	m_nmi_handler(*this),
 	m_romoffset(0),
 	m_spriteflip(0),
 	m_readroms(0),
 	m_irq_enabled(0),
 	m_nmi_enabled(0),
-	m_k051937_counter(0)
+	m_k051937_counter(0),
+	m_vblank(0)
 {
 }
 
@@ -160,12 +165,33 @@ void k051960_device::set_plane_order(device_t &device, int order)
 	}
 }
 
+//-------------------------------------------------
+//  set_screen_tag - set screen we are attached to
+//-------------------------------------------------
+
+void k051960_device::set_screen_tag(device_t &device, device_t *owner, const char *tag)
+{
+	k051960_device &dev = dynamic_cast<k051960_device &>(device);
+	dev.m_screen_tag = tag;
+}
+
 //-------------------------------------------------
 //  device_start - device-specific startup
 //-------------------------------------------------
 
 void k051960_device::device_start()
 {
+	if (m_screen_tag != NULL)
+	{
+		// make sure our screen is started
+		screen_device *screen = m_owner->subdevice<screen_device>(m_screen_tag);
+		if (!screen->started())
+			throw device_missing_dependencies();
+
+		// and register a callback for vblank state
+		screen->register_vblank_callback(vblank_state_delegate(FUNC(k051960_device::vblank_callback), this));
+	}
+
 	m_sprite_rom = region()->base();
 	m_sprite_size = region()->bytes();
 
@@ -180,6 +206,12 @@ void k051960_device::device_start()
 	// bind callbacks
 	m_k051960_cb.bind_relative_to(*owner());
 
+	// resolve callbacks
+	m_irq_handler.resolve_safe();
+	m_firq_handler.resolve_safe();
+	m_nmi_handler.resolve_safe();
+
+	// register for save states
 	save_item(NAME(m_romoffset));
 	save_item(NAME(m_spriteflip));
 	save_item(NAME(m_readroms));
@@ -187,8 +219,8 @@ void k051960_device::device_start()
 	save_pointer(NAME(m_ram), 0x400);
 	save_item(NAME(m_irq_enabled));
 	save_item(NAME(m_nmi_enabled));
-
 	save_item(NAME(m_k051937_counter));
+	save_item(NAME(m_vblank));
 }
 
 //-------------------------------------------------
@@ -215,6 +247,17 @@ void k051960_device::device_reset()
     DEVICE HANDLERS
 *****************************************************************************/
 
+void k051960_device::update_irq()
+{
+	m_irq_handler(m_irq_enabled && m_vblank ? ASSERT_LINE : CLEAR_LINE);
+}
+
+void k051960_device::vblank_callback(screen_device &screen, bool state)
+{
+	m_vblank = state;
+	update_irq();
+}
+
 int k051960_device::k051960_fetchromdata( int byte )
 {
 	int code, color, pri, shadow, off1, addr;
@@ -274,6 +317,7 @@ WRITE8_MEMBER( k051960_device::k051937_w )
 
 		/* bit 0 is IRQ enable */
 		m_irq_enabled = data & 0x01;
+		update_irq();
 
 		/* bit 1: probably FIRQ enable */
 

src/mame/video/k051960.h

@@ -21,6 +21,12 @@ typedef device_delegate<void (int *code, int *color, int *priority, int *shadow)
 #define MCFG_K051960_PLANEORDER(_order) \
 	k051960_device::set_plane_order(*device, _order);
 
+#define MCFG_K051960_SCREEN_TAG(_tag) \
+		k051960_device::set_screen_tag(*device, owner, _tag);
+
+#define MCFG_K051960_IRQ_HANDLER(_devcb) \
+	devcb = &k051960_device::set_irq_handler(*device, DEVCB_##_devcb);
+
 
 class k051960_device : public device_t,
 							public device_gfx_interface
@@ -36,9 +42,13 @@ public:
 	k051960_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
 	~k051960_device() {}
 
+	template<class _Object> static devcb_base &set_irq_handler(device_t &device, _Object object)
+		{ return downcast<k051960_device &>(device).m_irq_handler.set_callback(object); }
+
 	// static configuration
 	static void set_k051960_callback(device_t &device, k051960_cb_delegate callback) { downcast<k051960_device &>(device).m_k051960_cb = callback; }
 	static void set_plane_order(device_t &device, int order);
+	static void set_screen_tag(device_t &device, device_t *owner, const char *tag);
 
 	/*
 	The callback is passed:
@@ -64,10 +74,13 @@ public:
 	int k051960_is_irq_enabled();
 	int k051960_is_nmi_enabled();
 
+	void vblank_callback(screen_device &screen, bool state);
+
 protected:
 	// device-level overrides
 	virtual void device_start();
 	virtual void device_reset();
+
 private:
 	// internal state
 	UINT8    *m_ram;
@@ -75,8 +88,14 @@ private:
 	UINT8 *m_sprite_rom;
 	UINT32 m_sprite_size;
 
+	const char *m_screen_tag;
+
 	k051960_cb_delegate m_k051960_cb;
 
+	devcb_write_line m_irq_handler;
+	devcb_write_line m_firq_handler;
+	devcb_write_line m_nmi_handler;
+
 	UINT8    m_spriterombank[3];
 	int      m_romoffset;
 	int      m_spriteflip, m_readroms;
@@ -84,6 +103,9 @@ private:
 
 	int      m_k051937_counter;
 
+	int m_vblank;
+	void update_irq();
+
 	int k051960_fetchromdata( int byte );
 };