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game/server/nav_entities.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//
+//=============================================================================//
+// nav_entities.h
+// Navigation entities
+// Author: Michael S. Booth (mike@turtlerockstudios.com), January 2003
+
+#ifndef NAV_ENTITIES_H
+#define NAV_ENTITIES_H
+
+//-----------------------------------------------------------------------------------------------------
+/**
+  * An entity that modifies pathfinding cost to all areas it overlaps, to allow map designers
+  * to tell bots to avoid/prefer certain regions.
+  */
+class CFuncNavCost : public CBaseEntity
+{
+public:
+	DECLARE_DATADESC();
+	DECLARE_CLASS( CFuncNavCost, CBaseEntity );
+
+	virtual void Spawn( void );
+	virtual void UpdateOnRemove( void );
+
+	void InputEnable( inputdata_t &inputdata );
+	void InputDisable( inputdata_t &inputdata );
+
+	bool IsEnabled( void ) const { return !m_isDisabled; }
+
+	void CostThink( void );
+
+	bool IsApplicableTo( CBaseCombatCharacter *who ) const;			// Return true if this cost applies to the given actor
+
+	virtual float GetCostMultiplier( CBaseCombatCharacter *who ) const	{ return 1.0f; }
+
+protected:
+	int m_team;
+	bool m_isDisabled;
+	string_t m_iszTags;
+
+	static CUtlVector< CHandle< CFuncNavCost > > gm_masterCostVector;
+	static CountdownTimer gm_dirtyTimer;
+	void UpdateAllNavCostDecoration( void );
+
+	CUtlVector< CFmtStr > m_tags;
+	bool HasTag( const char *groupname ) const;
+};
+
+
+//-----------------------------------------------------------------------------------------------------
+class CFuncNavAvoid : public CFuncNavCost
+{
+public:
+	DECLARE_CLASS( CFuncNavAvoid, CFuncNavCost );
+
+	virtual float GetCostMultiplier( CBaseCombatCharacter *who ) const;		// return pathfind cost multiplier for the given actor
+};
+
+
+//-----------------------------------------------------------------------------------------------------
+class CFuncNavPrefer : public CFuncNavCost
+{
+public:
+	DECLARE_CLASS( CFuncNavPrefer, CFuncNavCost );
+
+	virtual float GetCostMultiplier( CBaseCombatCharacter *who ) const;		// return pathfind cost multiplier for the given actor
+};
+
+
+//-----------------------------------------------------------------------------------------------------
+/**
+  * An entity that can block/unblock nav areas.  This is meant for semi-transient areas that block
+  * pathfinding but can be ignored for longer-term queries like computing L4D flow distances and
+  * escape routes.
+  */
+class CFuncNavBlocker : public CBaseEntity
+{
+	DECLARE_DATADESC();
+	DECLARE_CLASS( CFuncNavBlocker, CBaseEntity );
+
+public:
+	void Spawn();
+	virtual void UpdateOnRemove( void );
+
+	void InputBlockNav( inputdata_t &inputdata );
+	void InputUnblockNav( inputdata_t &inputdata );
+
+	inline bool IsBlockingNav( int teamNumber ) const
+	{
+		if ( teamNumber == TEAM_ANY )
+		{
+			bool isBlocked = false;
+			for ( int i=0; i<MAX_NAV_TEAMS; ++i )
+			{
+				isBlocked |= m_isBlockingNav[ i ];
+			}
+
+			return isBlocked;
+		}
+
+		teamNumber = teamNumber % MAX_NAV_TEAMS;
+		return m_isBlockingNav[ teamNumber ];
+	}
+
+	int DrawDebugTextOverlays( void );
+
+	bool operator()( CNavArea *area );	// functor that blocks areas in our extent
+
+	static bool CalculateBlocked( bool *pResultByTeam, const Vector &vecMins, const Vector &vecMaxs );
+
+private:
+
+	void UpdateBlocked();
+
+	static CUtlLinkedList<CFuncNavBlocker *> gm_NavBlockers;
+
+	void BlockNav( void );
+	void UnblockNav( void );
+	bool m_isBlockingNav[MAX_NAV_TEAMS];
+	int m_blockedTeamNumber;
+	bool m_bDisabled;
+	Vector m_CachedMins, m_CachedMaxs;
+
+};
+
+#endif // NAV_ENTITIES_H