Adjust ghosting algorithm to work much better for super large zones as well

zone/client_packet.cpp

@@ -4498,7 +4498,7 @@ void Client::Handle_OP_ClientUpdate(const EQApplicationPacket *app) {
 	 */
 
 	float distance_moved                      = DistanceNoZ(GetLastPositionBeforeBulkUpdate(), GetPosition());
-	bool  moved_far_enough_before_bulk_update = distance_moved >= 1200;
+	bool  moved_far_enough_before_bulk_update = distance_moved >= zone->GetNpcPositionUpdateDistance();
 	bool  is_ready_to_update                  = (
 		client_zone_wide_full_position_update_timer.Check() || moved_far_enough_before_bulk_update
 	);
@@ -4515,8 +4515,8 @@ void Client::Handle_OP_ClientUpdate(const EQApplicationPacket *app) {
 				continue;
 			}
 
-			float distance_from_client_to_ignore = zone->GetMaxMovementUpdateRange() - 100;
-			if (CalculateDistance(entity->GetX(), entity->GetY(), entity->GetZ()) <= distance_from_client_to_ignore) {
+			float distance_from_client_to_ignore = zone->GetNpcPositionUpdateDistance();
+			if (entity->IsMoving() && CalculateDistance(entity->GetX(), entity->GetY(), entity->GetZ()) <= distance_from_client_to_ignore) {
 				continue;
 			}
 

zone/mob_movement_manager.cpp

@@ -762,7 +762,7 @@ void MobMovementManager::SendCommandToClients(
 	}
 	else {
 		float short_range = RuleR(Pathing, ShortMovementUpdateRange);
-		float long_range  = zone->GetMaxMovementUpdateRange();
+		float long_range  = zone->GetNpcPositionUpdateDistance();
 
 		for (auto &c : _impl->Clients) {
 			if (single_client && c != single_client) {

zone/zone.cpp

@@ -55,6 +55,7 @@
 #include "zone_config.h"
 #include "mob_movement_manager.h"
 #include "npc_scale_manager.h"
+#include "../common/data_verification.h"
 
 #include <time.h>
 #include <ctime>
@@ -864,6 +865,8 @@ Zone::Zone(uint32 in_zoneid, uint32 in_instanceid, const char* in_short_name)
 	m_last_ucss_update = 0;
 
 	mMovementManager = &MobMovementManager::Get();
+
+	SetNpcPositionUpdateDistance(0);
 }
 
 Zone::~Zone() {
@@ -1212,10 +1215,15 @@ bool Zone::Process() {
 			}
 		}
 
-		if(adv_data && !did_adventure_actions)
+		if (adv_data && !did_adventure_actions) {
 			DoAdventureActions();
-
 		}
+
+		if (GetNpcPositionUpdateDistance() == 0) {
+			CalculateNpcUpdateDistanceSpread();
+		}
+	}
+
 	if(initgrids_timer.Check()) {
 		//delayed grid loading stuff.
 		initgrids_timer.Disable();
@@ -2365,3 +2373,59 @@ void Zone::SetUCSServerAvailable(bool ucss_available, uint32 update_timestamp) {
 	if (m_last_ucss_update < update_timestamp)
 		m_ucss_available = ucss_available;
 }
+
+int Zone::GetNpcPositionUpdateDistance() const
+{
+	return npc_position_update_distance;
+}
+
+void Zone::SetNpcPositionUpdateDistance(int in_npc_position_update_distance)
+{
+	Zone::npc_position_update_distance = in_npc_position_update_distance;
+}
+
+void Zone::CalculateNpcUpdateDistanceSpread()
+{
+	float max_x = 0;
+	float max_y = 0;
+	float min_x = 0;
+	float min_y = 0;
+
+	auto &mob_list = entity_list.GetMobList();
+
+	for (auto &it : mob_list) {
+		Mob *entity = it.second;
+		if (!entity->IsNPC()) {
+			continue;
+		}
+
+		if (entity->GetX() <= min_x) {
+			min_x = entity->GetX();
+		}
+
+		if (entity->GetY() <= min_y) {
+			min_y = entity->GetY();
+		}
+
+		if (entity->GetX() >= max_x) {
+			max_x = entity->GetX();
+		}
+
+		if (entity->GetY() >= max_y) {
+			max_y = entity->GetY();
+		}
+	}
+
+	int x_spread        = int(abs(max_x - min_x));
+	int y_spread        = int(abs(max_y - min_y));
+	int combined_spread = int(abs((x_spread + y_spread) / 2));
+	int update_distance = EQEmu::ClampLower(int(combined_spread / 4), int(zone->GetMaxMovementUpdateRange()));
+
+	SetNpcPositionUpdateDistance(update_distance);
+
+	Log(Logs::General, Logs::Debug,
+		"NPC update spread distance set to [%i] combined_spread [%i]",
+		update_distance,
+		combined_spread
+	);
+}

zone/zone.h

@@ -126,6 +126,9 @@ public:
 	bool Process();
 	bool SaveZoneCFG();
 
+	int GetNpcPositionUpdateDistance() const;
+	void SetNpcPositionUpdateDistance(int in_npc_position_update_distance);
+
 	char *adv_data;
 
 	const char *GetSpellBlockedMessage(uint32 spell_id, const glm::vec3 &location);
@@ -219,6 +222,7 @@ public:
 	void ChangeWeather();
 	void ClearBlockedSpells();
 	void ClearNPCTypeCache(int id);
+	void CalculateNpcUpdateDistanceSpread();
 	void DelAggroMob() { aggroedmobs--; }
 	void DeleteQGlobal(std::string name, uint32 npcID, uint32 charID, uint32 zoneID);
 	void Despawn(uint32 spawngroupID);
@@ -290,7 +294,7 @@ public:
 		 */
 		find_replace(message, std::string("%"), std::string("."));
 
-		if (message.find("\n") != std::string::npos) {
+		if (message.find('\n') != std::string::npos) {
 			auto message_split = SplitString(message, '\n');
 			entity_list.MessageStatus(
 				0,
@@ -345,6 +349,7 @@ private:
 	glm::vec4 m_Graveyard;
 	int       default_ruleset;
 	int       totalBS;
+	int       npc_position_update_distance;
 	int32     aggroedmobs;
 	uint8     zone_type;
 	uint16    instanceversion;