gunpey, hexion, triplhnt, ultratnk: initialized some variables which were causing incorrect behaviours in drvnoclear debug builds

src/mame/drivers/gunpey.cpp

@@ -250,6 +250,7 @@ public:
 	void gunpey(machine_config &config);
 
 protected:
+	virtual void machine_start() override;
 	virtual void video_start() override;
 
 private:
@@ -309,6 +310,12 @@ private:
 };
 
 
+void gunpey_state::machine_start()
+{
+	m_irq_cause = 0;
+	m_irq_mask = 0;
+}
+
 void gunpey_state::video_start()
 {
 	// assumes it can make an address mask from m_blit_rom.length() - 1

src/mame/drivers/triplhnt.cpp

@@ -92,6 +92,8 @@ uint8_t triplhnt_state::da_latch_r(offs_t offset)
 void triplhnt_state::machine_start()
 {
 	m_lamp.resolve();
+
+	m_hit_code = 0;
 }
 
 

src/mame/includes/hexion.h

@@ -24,6 +24,9 @@ public:
 	void hexion(machine_config &config);
 	void hexionb(machine_config &config);
 
+protected:
+	virtual void video_start() override;
+
 private:
 	required_device<cpu_device> m_maincpu;
 	required_device<k053252_device> m_k053252;
@@ -55,8 +58,6 @@ private:
 
 	TIMER_DEVICE_CALLBACK_MEMBER(scanline);
 
-	virtual void video_start() override;
-
 	uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
 	inline void get_tile_info(tile_data &tileinfo,int tile_index,uint8_t *ram);
 	void hexion_map(address_map &map);

src/mame/includes/triplhnt.h

@@ -52,6 +52,11 @@ public:
 
 	void init_triplhnt();
 
+protected:
+	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
+	virtual void machine_start() override;
+	virtual void video_start() override;
+
 private:
 	enum
 	{
@@ -67,15 +72,12 @@ private:
 	uint8_t da_latch_r(offs_t offset);
 
 	TILE_GET_INFO_MEMBER(get_tile_info);
-	virtual void video_start() override;
 	void triplhnt_palette(palette_device &palette) const;
 
 	uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
 	void draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect);
 	void set_collision(int code);
 
-	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
-	virtual void machine_start() override;
 	void triplhnt_map(address_map &map);
 
 	required_device<cpu_device> m_maincpu;

src/mame/includes/ultratnk.h

@@ -36,6 +36,12 @@ public:
 	void ultratnk(machine_config &config);
 
 protected:
+	virtual void machine_start() override;
+	virtual void machine_reset() override;
+	virtual void video_start() override;
+	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
+
+private:
 	enum
 	{
 		TIMER_NMI
@@ -54,9 +60,6 @@ protected:
 	void attract_w(uint8_t data);
 	void explosion_w(uint8_t data);
 
-	virtual void machine_start() override;
-	virtual void machine_reset() override;
-	virtual void video_start() override;
 	void ultratnk_palette(palette_device &palette) const;
 
 	TILE_GET_INFO_MEMBER(tile_info);
@@ -64,7 +67,6 @@ protected:
 	DECLARE_WRITE_LINE_MEMBER(screen_vblank);
 	TIMER_CALLBACK_MEMBER(nmi_callback);
 
-	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
 	void ultratnk_cpu_map(address_map &map);
 
 	required_device<cpu_device> m_maincpu;

src/mame/video/hexion.cpp

@@ -53,6 +53,8 @@ void hexion_state::video_start()
 	m_unkram = m_vram[1] + 0x2000;
 
 	membank("bank1")->configure_entries(0, 16, memregion("maincpu")->base() + 0x10000, 0x2000);
+
+	m_gfxrom_select = 0;
 }
 
 

src/mame/video/ultratnk.cpp

@@ -50,6 +50,8 @@ void ultratnk_state::video_start()
 	m_screen->register_screen_bitmap(m_helper);
 
 	m_playfield = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(ultratnk_state::tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
+
+	std::fill(std::begin(m_collision), std::end(m_collision), 0);
 }