From 6c8616c1c710efbfaca766e3e27deeafd97fdcd5 Mon Sep 17 00:00:00 2001
From: Curt Coder <curtcoder@mail.com>
Date: Tue, 14 Jan 2014 18:49:24 +0000
Subject: [PATCH] tms9927: Added VSYNC callback. [Curt Coder]

---
 src/emu/video/tms9927.c | 39 +++++++++++++++++++++++++++++++++++++--
 src/emu/video/tms9927.h | 17 +++++++++++++++++
 2 files changed, 54 insertions(+), 2 deletions(-)

diff --git a/src/emu/video/tms9927.c b/src/emu/video/tms9927.c
index 831c088b2dc..59d3b05b4d8 100644
--- a/src/emu/video/tms9927.c
+++ b/src/emu/video/tms9927.c
@@ -37,13 +37,15 @@ const device_type CRT5057 = &device_creator<crt5057_device>;
 
 tms9927_device::tms9927_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
 				: device_t(mconfig, TMS9927, "TMS9927", tag, owner, clock, "tms9927", __FILE__),
-					device_video_interface(mconfig, *this)
+					device_video_interface(mconfig, *this),
+					m_write_vsyn(*this)
 {
 }
 
 tms9927_device::tms9927_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source)
 				: device_t(mconfig, type, name, tag, owner, clock, shortname, source),
-					device_video_interface(mconfig, *this)
+					device_video_interface(mconfig, *this),
+					m_write_vsyn(*this)
 {
 }
 
@@ -98,6 +100,12 @@ void tms9927_device::device_start()
 		assert(m_selfload != NULL);
 	}
 
+	// resolve callbacks
+	m_write_vsyn.resolve_safe();
+
+	// allocate timers
+	m_vsync_timer = timer_alloc(TIMER_VSYNC);
+
 	/* register for state saving */
 	machine().save().register_postload(save_prepost_delegate(FUNC(tms9927_device::state_postload), this));
 
@@ -130,6 +138,30 @@ void tms9927_device::device_stop()
 
 
 
+//-------------------------------------------------
+//  device_timer - handle timer events
+//-------------------------------------------------
+
+void tms9927_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
+{
+	switch (id)
+	{
+	case TIMER_VSYNC:
+		m_vsyn = !m_vsyn;
+
+		m_write_vsyn(m_vsyn);
+
+		if (m_vsyn)
+		{
+			m_vsync_timer->adjust(m_screen->time_until_pos(3));
+		}
+		else
+		{
+			m_vsync_timer->adjust(m_screen->time_until_pos(0));
+		}
+		break;
+	}
+}
 
 void tms9927_device::state_postload()
 {
@@ -297,4 +329,7 @@ void tms9927_device::recompute_parameters(int postload)
 	refresh = HZ_TO_ATTOSECONDS(m_clock) * m_total_hpix * m_total_vpix;
 
 	m_screen->configure(m_total_hpix, m_total_vpix, visarea, refresh);
+
+	m_vsyn = 0;
+	m_vsync_timer->adjust(m_screen->time_until_pos(0, 0));
 }
diff --git a/src/emu/video/tms9927.h b/src/emu/video/tms9927.h
index 2405fbd1274..8f0b7f2b0a7 100644
--- a/src/emu/video/tms9927.h
+++ b/src/emu/video/tms9927.h
@@ -10,6 +10,10 @@
 #ifndef __TMS9927__
 #define __TMS9927__
 
+
+#define MCFG_TMS9927_VSYN_CALLBACK(_write) \
+	devcb = &tms9927_device::set_vsyn_wr_callback(*device, DEVCB2_##_write);
+
 /* interface */
 struct tms9927_interface
 {
@@ -27,6 +31,8 @@ public:
 	tms9927_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source);
 	~tms9927_device() {}
 
+	template<class _Object> static devcb2_base &set_vsyn_wr_callback(device_t &device, _Object object) { return downcast<tms9927_device &>(device).m_write_vsyn.set_callback(object); }
+
 	DECLARE_WRITE8_MEMBER(write);
 	DECLARE_READ8_MEMBER(read);
 
@@ -40,13 +46,20 @@ protected:
 	virtual void device_start();
 	virtual void device_stop();
 	virtual void device_reset();
+	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
 
 private:
+	enum
+	{
+		TIMER_VSYNC
+	};
 
 	void state_postload();
 	void recompute_parameters(int postload);
 	void generic_access(address_space &space, offs_t offset);
 
+	devcb2_write_line m_write_vsyn;
+
 	// internal state
 	const UINT8 *m_selfload;
 
@@ -60,6 +73,10 @@ private:
 	UINT8   m_valid_config;
 	UINT16  m_total_hpix, m_total_vpix;
 	UINT16  m_visible_hpix, m_visible_vpix;
+
+	int m_vsyn;
+
+	emu_timer *m_vsync_timer;
 };
 
 extern const device_type TMS9927;