From 75f142e18a7eeee6139908b76b33fc800eece44c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=AA=20H=C3=A0n=20Minh=20Khang?= <khanghugo123@gmail.com>
Date: Wed, 8 May 2024 10:52:41 -0400
Subject: [PATCH] Add trigger_teleport landmark (#952)

* Add trigger_teleport landmark
---
 regamedll/dlls/triggers.cpp                   | 44 ++++++++++++++++++-
 regamedll/dlls/triggers.h                     |  6 +++
 .../GameDefinitionFile/regamedll-cs.fgd       |  2 +
 3 files changed, 51 insertions(+), 1 deletion(-)

diff --git a/regamedll/dlls/triggers.cpp b/regamedll/dlls/triggers.cpp
index c4af258c4..49e4d14c4 100644
--- a/regamedll/dlls/triggers.cpp
+++ b/regamedll/dlls/triggers.cpp
@@ -1763,8 +1763,30 @@ void CBaseTrigger::TeleportTouch(CBaseEntity *pOther)
 
 	if (pOther->IsPlayer())
 	{
+#ifdef REGAMEDLL_ADD
+		// If a landmark was specified, offset the player relative to the landmark
+		if (m_iszLandmarkName)
+		{
+			edict_t *pentLandmark = FIND_ENTITY_BY_TARGETNAME(nullptr, STRING(m_iszLandmarkName));
+
+			if (!FNullEnt(pentLandmark))
+			{
+				Vector diff = pevToucher->origin - VARS(pentLandmark)->origin;
+				tmp += diff;
+				tmp.z--; // offset by +1 because -1 will run out of this scope.
+			}
+			else
+			{
+				// fallback, shouldn't happen but anyway.
+				tmp.z -= pOther->pev->mins.z;
+			}
+		}
+		else
+#endif
 		// make origin adjustments in case the teleportee is a player. (origin in center, not at feet)
-		tmp.z -= pOther->pev->mins.z;
+		{
+			tmp.z -= pOther->pev->mins.z;
+		}
 	}
 
 	tmp.z++;
@@ -1817,6 +1839,26 @@ void CTriggerTeleport::Spawn()
 	SetTouch(&CTriggerTeleport::TeleportTouch);
 }
 
+void CTriggerTeleport::KeyValue(KeyValueData *pkvd)
+{
+#ifdef REGAMEDLL_ADD
+	if (FStrEq(pkvd->szKeyName, "landmark"))
+	{
+		if (Q_strlen(pkvd->szValue) > 0)
+		{
+			m_iszLandmarkName = ALLOC_STRING(pkvd->szValue);
+		}
+
+		// If empty, handle it in the teleport touch instead
+		pkvd->fHandled = TRUE;
+	}
+	else
+#endif
+	{
+		CBaseTrigger::KeyValue(pkvd);
+	}
+}
+
 LINK_ENTITY_TO_CLASS(info_teleport_destination, CPointEntity, CCSPointEntity)
 LINK_ENTITY_TO_CLASS(func_buyzone, CBuyZone, CCSBuyZone)
 
diff --git a/regamedll/dlls/triggers.h b/regamedll/dlls/triggers.h
index c16f969c8..b21a6bde5 100644
--- a/regamedll/dlls/triggers.h
+++ b/regamedll/dlls/triggers.h
@@ -204,6 +204,11 @@ class CBaseTrigger: public CBaseToggle
 	void EXPORT CounterUse(CBaseEntity *pActivator, CBaseEntity *pCaller, USE_TYPE useType, float value);
 	void EXPORT ToggleUse(CBaseEntity *pActivator, CBaseEntity *pCaller, USE_TYPE useType, float value);
 	void InitTrigger();
+
+#ifdef REGAMEDLL_ADD
+	// For trigger_teleport TriggerTouch
+	int m_iszLandmarkName = 0;
+#endif
 };
 
 #define SF_TRIGGER_HURT_TARGETONCE      BIT(0) // Only fire hurt target once
@@ -393,6 +398,7 @@ class CTriggerTeleport: public CBaseTrigger
 {
 public:
 	virtual void Spawn();
+	virtual void KeyValue(KeyValueData *pkvd);
 };
 
 class CBuyZone: public CBaseTrigger
diff --git a/regamedll/extra/Toolkit/GameDefinitionFile/regamedll-cs.fgd b/regamedll/extra/Toolkit/GameDefinitionFile/regamedll-cs.fgd
index 0e6838732..79fe8333a 100644
--- a/regamedll/extra/Toolkit/GameDefinitionFile/regamedll-cs.fgd
+++ b/regamedll/extra/Toolkit/GameDefinitionFile/regamedll-cs.fgd
@@ -1934,6 +1934,7 @@
 	bombradius(integer) : "Bomb Radius" : 500
 ]
 
+@PointClass base(Targetname) iconsprite("sprites/CS/info_target.spr") = info_landmark : "Transition/Relative teleport Landmark" []
 @PointClass base(Targetname) iconsprite("sprites/CS/info_target.spr") = info_null : "info_null (spotlight target)" []
 @PointClass iconsprite("sprites/CS/info_player_deathmatch.spr") base(PlayerClass) = info_player_deathmatch : "Terrorist start" []
 @PointClass iconsprite("sprites/CS/info_player_start.spr") base(PlayerClass) = info_player_start : "Counter-terrorist start" []
@@ -2264,6 +2265,7 @@
 
 @SolidClass base(Trigger) = trigger_teleport : "Trigger teleport" 
 [
+	landmark(string) : "Landmark name"
 	spawnflags(flags) =
 	[
 		256: "Keep angles" : 0