Track the real wiimote rumble state to drop outgoing rumble reports w…

…ith no effect.

This eliminates constant streams of reports in various games that constantly send audio reports. (Just Dance 2, DKCR, etc.)
(Speaker data reports are converted to rumble reports when speaker data is disabled.)

Source/Core/Core/Src/HW/WiimoteReal/WiimoteReal.cpp

@@ -58,7 +58,9 @@ Wiimote::Wiimote()
 	, dev_handle(0), stack(MSBT_STACK_UNKNOWN)
 #endif
 	, m_last_input_report()
-	, m_channel(0), m_run_thread(false)
+	, m_channel(0)
+	, m_rumble_state()
+	, m_run_thread(false)
 {
 #if defined(__linux__) && HAVE_BLUEZ
 	bdaddr = (bdaddr_t){{0, 0, 0, 0, 0, 0}};
@@ -76,6 +78,26 @@ Wiimote::~Wiimote()
 	m_write_reports.Clear();
 }
 
+// to be called from CPU thread
+void Wiimote::WriteReport(Report rpt)
+{
+	if (rpt.size() >= 3)
+	{
+		bool const new_rumble_state = (rpt[2] & 0x1) != 0;
+
+		if (WM_RUMBLE == rpt[1] && new_rumble_state == m_rumble_state)
+		{
+			// If this is a rumble report and the rumble state didn't change, ignore
+			//ERROR_LOG(WIIMOTE, "Ignoring rumble report.");
+			return;
+		}
+
+		m_rumble_state = new_rumble_state;
+	}
+
+	m_write_reports.Push(std::move(rpt));
+}
+
 // to be called from CPU thread
 void Wiimote::QueueReport(u8 rpt_id, const void* _data, unsigned int size)
 {
@@ -85,7 +107,7 @@ void Wiimote::QueueReport(u8 rpt_id, const void* _data, unsigned int size)
 	rpt[0] = WM_SET_REPORT | WM_BT_OUTPUT;
 	rpt[1] = rpt_id;
 	std::copy_n(data, size, rpt.begin() + 2);
-	m_write_reports.Push(std::move(rpt));
+	WriteReport(std::move(rpt));
 }
 
 void Wiimote::DisableDataReporting()
@@ -171,7 +193,7 @@ void Wiimote::InterruptChannel(const u16 channel, const void* const _data, const
 		rpt.resize(3);
 	}
 
-	m_write_reports.Push(std::move(rpt));
+	WriteReport(std::move(rpt));
 }
 
 bool Wiimote::Read()

Source/Core/Core/Src/HW/WiimoteReal/WiimoteReal.h

@@ -103,12 +103,15 @@ friend class WiimoteEmu::Wiimote;
 
 private:
 	void ClearReadQueue();
+	void WriteReport(Report rpt);
 
 	int IORead(u8* buf);
 	int IOWrite(u8 const* buf, int len);
 
 	void ThreadFunc();
 
+	bool m_rumble_state;
+
 	bool				m_run_thread;
 	std::thread			m_wiimote_thread;