Merge #3498

3498: Make netclipping of entities and events respect shown distance (fixes #3420) r=heinrich5991 a=def-

<!-- What is the motivation for the changes of this pull request -->

## Checklist

- [x] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test if it works standalone, system.c especially
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)


Co-authored-by: def <dennis@felsin9.de>

src/game/server/entities/character.cpp

@@ -1293,27 +1293,6 @@ void CCharacter::Snap(int SnappingClient)
 	pDDNetCharacter->m_StrongWeakID = m_StrongWeakID;
 }
 
-int CCharacter::NetworkClipped(int SnappingClient)
-{
-	return NetworkClipped(SnappingClient, m_Pos);
-}
-
-int CCharacter::NetworkClipped(int SnappingClient, vec2 CheckPos)
-{
-	if(SnappingClient == -1 || GameServer()->m_apPlayers[SnappingClient]->m_ShowAll)
-		return 0;
-
-	float dx = GameServer()->m_apPlayers[SnappingClient]->m_ViewPos.x - CheckPos.x;
-	if(absolute(dx) > GameServer()->m_apPlayers[SnappingClient]->m_ShowDistance.x)
-		return 1;
-
-	float dy = GameServer()->m_apPlayers[SnappingClient]->m_ViewPos.y - CheckPos.y;
-	if(absolute(dy) > GameServer()->m_apPlayers[SnappingClient]->m_ShowDistance.y)
-		return 1;
-
-	return 0;
-}
-
 // DDRace
 
 bool CCharacter::CanCollide(int ClientID)

src/game/server/entities/character.h

@@ -40,8 +40,6 @@ public:
 	virtual void TickDefered();
 	virtual void TickPaused();
 	virtual void Snap(int SnappingClient);
-	virtual int NetworkClipped(int SnappingClient);
-	virtual int NetworkClipped(int SnappingClient, vec2 CheckPos);
 
 	bool IsGrounded();
 

src/game/server/entity.cpp

@@ -29,25 +29,14 @@ CEntity::~CEntity()
 	Server()->SnapFreeID(m_ID);
 }
 
-int CEntity::NetworkClipped(int SnappingClient)
+bool CEntity::NetworkClipped(int SnappingClient)
 {
-	return NetworkClipped(SnappingClient, m_Pos);
+	return ::NetworkClipped(GameServer(), SnappingClient, m_Pos);
 }
 
-int CEntity::NetworkClipped(int SnappingClient, vec2 CheckPos)
+bool CEntity::NetworkClipped(int SnappingClient, vec2 CheckPos)
 {
-	if(SnappingClient == -1)
-		return 0;
-
-	float dx = GameServer()->m_apPlayers[SnappingClient]->m_ViewPos.x - CheckPos.x;
-	float dy = GameServer()->m_apPlayers[SnappingClient]->m_ViewPos.y - CheckPos.y;
-
-	if(absolute(dx) > 1000.0f || absolute(dy) > 800.0f)
-		return 1;
-
-	if(distance(GameServer()->m_apPlayers[SnappingClient]->m_ViewPos, CheckPos) > 4000.0f)
-		return 1;
-	return 0;
+	return ::NetworkClipped(GameServer(), SnappingClient, CheckPos);
 }
 
 bool CEntity::GameLayerClipped(vec2 CheckPos)
@@ -96,3 +85,19 @@ bool CEntity::GetNearestAirPosPlayer(vec2 PlayerPos, vec2 *OutPos)
 	}
 	return false;
 }
+
+bool NetworkClipped(CGameContext *pGameServer, int SnappingClient, vec2 CheckPos)
+{
+	if(SnappingClient == -1 || pGameServer->m_apPlayers[SnappingClient]->m_ShowAll)
+		return false;
+
+	float dx = pGameServer->m_apPlayers[SnappingClient]->m_ViewPos.x - CheckPos.x;
+	if(absolute(dx) > pGameServer->m_apPlayers[SnappingClient]->m_ShowDistance.x)
+		return true;
+
+	float dy = pGameServer->m_apPlayers[SnappingClient]->m_ViewPos.y - CheckPos.y;
+	if(absolute(dy) > pGameServer->m_apPlayers[SnappingClient]->m_ShowDistance.y)
+		return true;
+
+	return false;
+}

src/game/server/entity.h

@@ -6,6 +6,7 @@
 #include <base/vmath.h>
 
 #include "alloc.h"
+#include "gamecontext.h"
 #include "gameworld.h"
 
 /*
@@ -119,7 +120,7 @@ public:
 	virtual void Snap(int SnappingClient) {}
 
 	/*
-		Function: networkclipped(int snapping_client)
+		Function: NetworkClipped
 			Performs a series of test to see if a client can see the
 			entity.
 
@@ -130,10 +131,10 @@ public:
 				recording.
 
 		Returns:
-			Non-zero if the entity doesn't have to be in the snapshot.
+			True if the entity doesn't have to be in the snapshot.
 	*/
-	virtual int NetworkClipped(int SnappingClient);
-	virtual int NetworkClipped(int SnappingClient, vec2 CheckPos);
+	bool NetworkClipped(int SnappingClient);
+	bool NetworkClipped(int SnappingClient, vec2 CheckPos);
 
 	bool GameLayerClipped(vec2 CheckPos);
 
@@ -146,4 +147,6 @@ public:
 	int m_Layer;
 };
 
+bool NetworkClipped(CGameContext *pGameServer, int SnappingClient, vec2 CheckPos);
+
 #endif

src/game/server/eventhandler.cpp

@@ -1,6 +1,8 @@
 /* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
 /* If you are missing that file, acquire a complete release at teeworlds.com.                */
 #include "eventhandler.h"
+
+#include "entity.h"
 #include "gamecontext.h"
 #include "player.h"
 
@@ -48,7 +50,7 @@ void CEventHandler::Snap(int SnappingClient)
 		if(SnappingClient == -1 || CmaskIsSet(m_aClientMasks[i], SnappingClient))
 		{
 			CNetEvent_Common *ev = (CNetEvent_Common *)&m_aData[m_aOffsets[i]];
-			if(SnappingClient == -1 || distance(GameServer()->m_apPlayers[SnappingClient]->m_ViewPos, vec2(ev->m_X, ev->m_Y)) < 1500.0f)
+			if(!NetworkClipped(GameServer(), SnappingClient, vec2(ev->m_X, ev->m_Y)))
 			{
 				int Type = m_aTypes[i];
 				int Size = m_aSizes[i];

src/game/server/eventhandler.h

@@ -4,7 +4,8 @@
 #define GAME_SERVER_EVENTHANDLER_H
 
 #include <base/system.h>
-//
+#include <base/vmath.h>
+
 class CEventHandler
 {
 	static const int MAX_EVENTS = 128;