Various code improvements

* Camera: Fix division by 0 after view bobbing
* Remove ignored constness
* Connection: Improve window size range limits

src/client/camera.cpp

@@ -378,7 +378,8 @@ void Camera::update(LocalPlayer* player, f32 frametime, f32 busytime, f32 tool_r
 		// Smoothen and invert the above
 		fall_bobbing = sin(fall_bobbing * 0.5 * M_PI) * -1;
 		// Amplify according to the intensity of the impact
-		fall_bobbing *= (1 - rangelim(50 / player->camera_impact, 0, 1)) * 5;
+		if (player->camera_impact > 0.0f)
+			fall_bobbing *= (1 - rangelim(50 / player->camera_impact, 0, 1)) * 5;
 
 		fall_bobbing *= m_cache_fall_bobbing_amount;
 	}

src/client/client.h

@@ -334,13 +334,13 @@ public:
 	// disconnect client when CSM failed.
 	const std::string &accessDeniedReason() const { return m_access_denied_reason; }
 
-	const bool itemdefReceived() const
+	bool itemdefReceived() const
 	{ return m_itemdef_received; }
-	const bool nodedefReceived() const
+	bool nodedefReceived() const
 	{ return m_nodedef_received; }
-	const bool mediaReceived() const
+	bool mediaReceived() const
 	{ return !m_media_downloader; }
-	const bool activeObjectsReceived() const
+	bool activeObjectsReceived() const
 	{ return m_activeobjects_received; }
 
 	u16 getProtoVersion()

src/client/gameui.h

@@ -84,7 +84,7 @@ public:
 	void showTranslatedStatusText(const char *str);
 	inline void clearStatusText() { m_statustext.clear(); }
 
-	const bool isChatVisible()
+	bool isChatVisible()
 	{
 		return m_flags.show_chat && m_recent_chat_count != 0 && m_profiler_current_page == 0;
 	}

src/gui/guiFormSpecMenu.h

@@ -229,7 +229,7 @@ public:
 		return m_selected_item;
 	}
 
-	const u16 getSelectedAmount() const
+	u16 getSelectedAmount() const
 	{
 		return m_selected_amount;
 	}

src/inventory.cpp

@@ -995,7 +995,7 @@ const InventoryList *Inventory::getList(const std::string &name) const
 	return m_lists[i];
 }
 
-const s32 Inventory::getListIndex(const std::string &name) const
+s32 Inventory::getListIndex(const std::string &name) const
 {
 	for(u32 i=0; i<m_lists.size(); i++)
 	{

src/inventory.h

@@ -336,7 +336,7 @@ public:
 	}
 private:
 	// -1 if not found
-	const s32 getListIndex(const std::string &name) const;
+	s32 getListIndex(const std::string &name) const;
 
 	std::vector<InventoryList*> m_lists;
 	IItemDefManager *m_itemdef;

src/network/connection.cpp

@@ -578,7 +578,7 @@ u16 Channel::getOutgoingSequenceNumber(bool& successful)
 			// ugly cast but this one is required in order to tell compiler we
 			// know about difference of two unsigned may be negative in general
 			// but we already made sure it won't happen in this case
-			if (((u16)(next_outgoing_seqnum - lowest_unacked_seqnumber)) > window_size) {
+			if (((u16)(next_outgoing_seqnum - lowest_unacked_seqnumber)) > m_window_size) {
 				successful = false;
 				return 0;
 			}
@@ -588,7 +588,7 @@ u16 Channel::getOutgoingSequenceNumber(bool& successful)
 			// know about difference of two unsigned may be negative in general
 			// but we already made sure it won't happen in this case
 			if ((next_outgoing_seqnum + (u16)(SEQNUM_MAX - lowest_unacked_seqnumber)) >
-				window_size) {
+					m_window_size) {
 				successful = false;
 				return 0;
 			}
@@ -666,7 +666,7 @@ void Channel::UpdateTimers(float dtime)
 			//packet_too_late = current_packet_too_late;
 			packets_successful = current_packet_successful;
 
-			if (current_bytes_transfered > (unsigned int) (window_size*512/2)) {
+			if (current_bytes_transfered > (unsigned int) (m_window_size*512/2)) {
 				reasonable_amount_of_data_transmitted = true;
 			}
 			current_packet_loss = 0;
@@ -681,37 +681,25 @@ void Channel::UpdateTimers(float dtime)
 		if (packets_successful > 0) {
 			successful_to_lost_ratio = packet_loss/packets_successful;
 		} else if (packet_loss > 0) {
-			window_size = std::max(
+			setWindowSize(m_window_size - 10);
-					(window_size - 10),
-					MIN_RELIABLE_WINDOW_SIZE);
 			done = true;
 		}
 
 		if (!done) {
-			if ((successful_to_lost_ratio < 0.01f) &&
+			if (successful_to_lost_ratio < 0.01f) {
-				(window_size < MAX_RELIABLE_WINDOW_SIZE)) {
 				/* don't even think about increasing if we didn't even
 				 * use major parts of our window */
 				if (reasonable_amount_of_data_transmitted)
-					window_size = std::min(
+					setWindowSize(m_window_size + 100);
-							(window_size + 100),
+			} else if (successful_to_lost_ratio < 0.05f) {
-							MAX_RELIABLE_WINDOW_SIZE);
-			} else if ((successful_to_lost_ratio < 0.05f) &&
-					(window_size < MAX_RELIABLE_WINDOW_SIZE)) {
 				/* don't even think about increasing if we didn't even
 				 * use major parts of our window */
 				if (reasonable_amount_of_data_transmitted)
-					window_size = std::min(
+					setWindowSize(m_window_size + 50);
-							(window_size + 50),
-							MAX_RELIABLE_WINDOW_SIZE);
 			} else if (successful_to_lost_ratio > 0.15f) {
-				window_size = std::max(
+				setWindowSize(m_window_size - 100);
-						(window_size - 100),
-						MIN_RELIABLE_WINDOW_SIZE);
 			} else if (successful_to_lost_ratio > 0.1f) {
-				window_size = std::max(
+				setWindowSize(m_window_size - 50);
-						(window_size - 50),
-						MIN_RELIABLE_WINDOW_SIZE);
 			}
 		}
 	}

src/network/connection.h

@@ -420,34 +420,38 @@ public:
 
 	void UpdateTimers(float dtime);
 
-	const float getCurrentDownloadRateKB()
+	float getCurrentDownloadRateKB()
 		{ MutexAutoLock lock(m_internal_mutex); return cur_kbps; };
-	const float getMaxDownloadRateKB()
+	float getMaxDownloadRateKB()
 		{ MutexAutoLock lock(m_internal_mutex); return max_kbps; };
 
-	const float getCurrentLossRateKB()
+	float getCurrentLossRateKB()
 		{ MutexAutoLock lock(m_internal_mutex); return cur_kbps_lost; };
-	const float getMaxLossRateKB()
+	float getMaxLossRateKB()
 		{ MutexAutoLock lock(m_internal_mutex); return max_kbps_lost; };
 
-	const float getCurrentIncomingRateKB()
+	float getCurrentIncomingRateKB()
 		{ MutexAutoLock lock(m_internal_mutex); return cur_incoming_kbps; };
-	const float getMaxIncomingRateKB()
+	float getMaxIncomingRateKB()
 		{ MutexAutoLock lock(m_internal_mutex); return max_incoming_kbps; };
 
-	const float getAvgDownloadRateKB()
+	float getAvgDownloadRateKB()
 		{ MutexAutoLock lock(m_internal_mutex); return avg_kbps; };
-	const float getAvgLossRateKB()
+	float getAvgLossRateKB()
 		{ MutexAutoLock lock(m_internal_mutex); return avg_kbps_lost; };
-	const float getAvgIncomingRateKB()
+	float getAvgIncomingRateKB()
 		{ MutexAutoLock lock(m_internal_mutex); return avg_incoming_kbps; };
 
-	const unsigned int getWindowSize() const { return window_size; };
+	u16 getWindowSize() const { return m_window_size; };
+
+	void setWindowSize(long size)
+	{
+		m_window_size = (u16)rangelim(size, MIN_RELIABLE_WINDOW_SIZE, MAX_RELIABLE_WINDOW_SIZE);
+	}
 
-	void setWindowSize(unsigned int size) { window_size = size; };
 private:
 	std::mutex m_internal_mutex;
-	int window_size = MIN_RELIABLE_WINDOW_SIZE;
+	u16 m_window_size = MIN_RELIABLE_WINDOW_SIZE;
 
 	u16 next_incoming_seqnum = SEQNUM_INITIAL;
 
@@ -765,7 +769,7 @@ public:
 	Address GetPeerAddress(session_t peer_id);
 	float getPeerStat(session_t peer_id, rtt_stat_type type);
 	float getLocalStat(rate_stat_type type);
-	const u32 GetProtocolID() const { return m_protocol_id; };
+	u32 GetProtocolID() const { return m_protocol_id; };
 	const std::string getDesc();
 	void DisconnectPeer(session_t peer_id);
 

src/network/networkpacket.h

@@ -41,7 +41,7 @@ public:
 	u32 getSize() const { return m_datasize; }
 	session_t getPeerId() const { return m_peer_id; }
 	u16 getCommand() { return m_command; }
-	const u32 getRemainingBytes() const { return m_datasize - m_read_offset; }
+	u32 getRemainingBytes() const { return m_datasize - m_read_offset; }
 	const char *getRemainingString() { return getString(m_read_offset); }
 
 	// Returns a c-string without copying.

src/remoteplayer.cpp

@@ -84,7 +84,7 @@ RemotePlayer::RemotePlayer(const char *name, IItemDefManager *idef):
 }
 
 
-const RemotePlayerChatResult RemotePlayer::canSendChatMessage()
+RemotePlayerChatResult RemotePlayer::canSendChatMessage()
 {
 	// Rate limit messages
 	u32 now = time(NULL);

src/remoteplayer.h

@@ -47,7 +47,7 @@ public:
 	PlayerSAO *getPlayerSAO() { return m_sao; }
 	void setPlayerSAO(PlayerSAO *sao) { m_sao = sao; }
 
-	const RemotePlayerChatResult canSendChatMessage();
+	RemotePlayerChatResult canSendChatMessage();
 
 	void setHotbarItemcount(s32 hotbar_itemcount)
 	{