Don't send player position from client to server if the player hasn't moved

src/client.cpp

@@ -1976,10 +1976,24 @@ void Client::sendPlayerPos()
 {
 	//JMutexAutoLock envlock(m_env_mutex); //bulk comment-out
 	
-	Player *myplayer = m_env.getLocalPlayer();
+	LocalPlayer *myplayer = m_env.getLocalPlayer();
 	if(myplayer == NULL)
 		return;
 
+	// Save bandwidth by only updating position when something changed
+	if(myplayer->last_position == myplayer->getPosition() &&
+			myplayer->last_speed == myplayer->getSpeed() &&
+			myplayer->last_pitch == myplayer->getPitch() &&
+			myplayer->last_yaw == myplayer->getYaw() &&
+			myplayer->last_keyPressed == myplayer->keyPressed)
+		return;
+
+	myplayer->last_position = myplayer->getPosition();
+	myplayer->last_speed = myplayer->getSpeed();
+	myplayer->last_pitch = myplayer->getPitch();
+	myplayer->last_yaw = myplayer->getYaw();
+	myplayer->last_keyPressed = myplayer->keyPressed;
+
 	u16 our_peer_id;
 	{
 		//JMutexAutoLock lock(m_con_mutex); //bulk comment-out

src/localplayer.cpp

@@ -36,6 +36,11 @@ LocalPlayer::LocalPlayer(IGameDef *gamedef):
 	Player(gamedef),
 	isAttached(false),
 	overridePosition(v3f(0,0,0)),
+	last_position(v3f(0,0,0)),
+	last_speed(v3f(0,0,0)),
+	last_pitch(0),
+	last_yaw(0),
+	last_keyPressed(0),
 	m_sneak_node(32767,32767,32767),
 	m_sneak_node_exists(false),
 	m_old_node_below(32767,32767,32767),

src/localplayer.h

@@ -44,6 +44,14 @@ public:
 	void applyControl(float dtime);
 
 	v3s16 getStandingNodePos();
+
+	// Used to check if anything changed and prevent sending packets if not
+	v3f last_position;
+	v3f last_speed;
+	float last_pitch;
+	float last_yaw;
+	unsigned int last_keyPressed;
+
 private:
 	// This is used for determining the sneaking range
 	v3s16 m_sneak_node;