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diff --git a/game/server/doors.h b/game/server/doors.h
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+++ b/game/server/doors.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef DOORS_H
+#define DOORS_H
+#pragma once
+
+
+#include "locksounds.h"
+#include "entityoutput.h"
+
+//Since I'm here, might as well explain how these work.  Base.fgd is the file that connects
+//flags to entities.  It is full of lines with this number, a label, and a default value.
+//Voila, dynamicly generated checkboxes on the Flags tab of Entity Properties.
+
+// doors
+#define SF_DOOR_ROTATE_YAW			0		// yaw by default
+#define	SF_DOOR_START_OPEN_OBSOLETE	1
+#define SF_DOOR_ROTATE_BACKWARDS	2
+#define SF_DOOR_NONSOLID_TO_PLAYER	4
+#define SF_DOOR_PASSABLE			8
+#define SF_DOOR_ONEWAY				16
+#define	SF_DOOR_NO_AUTO_RETURN		32
+#define SF_DOOR_ROTATE_ROLL			64
+#define SF_DOOR_ROTATE_PITCH		128
+#define SF_DOOR_PUSE				256	// door can be opened by player's use button.
+#define SF_DOOR_NONPCS				512	// NPC can't open
+#define SF_DOOR_PTOUCH				1024 // player touch opens
+#define SF_DOOR_LOCKED				2048	// Door is initially locked
+#define SF_DOOR_SILENT				4096	// Door plays no audible sound, and does not alert NPCs when opened
+#define	SF_DOOR_USE_CLOSES			8192	// Door can be +used to close before its autoreturn delay has expired.
+#define SF_DOOR_SILENT_TO_NPCS		16384	// Does not alert NPC's when opened.
+#define SF_DOOR_IGNORE_USE			32768	// Completely ignores player +use commands.
+#define SF_DOOR_NEW_USE_RULES		65536	// For func_door entities, behave more like prop_door_rotating with respect to +USE (changelist 242482)
+
+
+enum FuncDoorSpawnPos_t
+{
+	FUNC_DOOR_SPAWN_CLOSED = 0,
+	FUNC_DOOR_SPAWN_OPEN,
+};
+
+
+class CBaseDoor : public CBaseToggle
+{
+public:
+	DECLARE_CLASS( CBaseDoor, CBaseToggle );
+
+	DECLARE_SERVERCLASS();
+
+	void Spawn( void );
+	void Precache( void );
+	bool CreateVPhysics();
+	bool KeyValue( const char *szKeyName, const char *szValue );
+	virtual void Use( CBaseEntity *pActivator, CBaseEntity *pCaller, USE_TYPE useType, float value );
+
+	virtual void StartBlocked( CBaseEntity *pOther );
+	virtual void Blocked( CBaseEntity *pOther );
+	virtual void EndBlocked( void );
+
+	void Activate( void );
+
+	virtual int	ObjectCaps( void ) 
+	{
+		int flags = BaseClass::ObjectCaps();
+		if ( HasSpawnFlags( SF_DOOR_PUSE ) )
+			return flags | FCAP_IMPULSE_USE | FCAP_USE_IN_RADIUS;
+
+		return flags;
+	};
+
+	DECLARE_DATADESC();
+
+	// This is ONLY used by the node graph to test movement through a door
+	void InputSetToggleState( inputdata_t &inputdata );
+	virtual void SetToggleState( int state );
+
+	virtual bool IsRotatingDoor() { return false; }
+	virtual bool ShouldSavePhysics();
+	// used to selectivly override defaults
+	void DoorTouch( CBaseEntity *pOther );
+
+	// local functions
+	int DoorActivate( );
+	void DoorGoUp( void );
+	void DoorGoDown( void );
+	void DoorHitTop( void );
+	void DoorHitBottom( void );
+	void UpdateAreaPortals( bool isOpen );
+	void Unlock( void );
+	void Lock( void );
+	int GetDoorMovementGroup( CBaseDoor *pDoorList[], int listMax );
+
+	// Input handlers
+	void InputClose( inputdata_t &inputdata );
+	void InputLock( inputdata_t &inputdata );
+	void InputOpen( inputdata_t &inputdata );
+	void InputToggle( inputdata_t &inputdata );
+	void InputUnlock( inputdata_t &inputdata );
+	void InputSetSpeed( inputdata_t &inputdata );
+
+	Vector m_vecMoveDir;		// The direction of motion for linear moving doors.
+
+	locksound_t m_ls;			// door lock sounds
+	
+	byte	m_bLockedSentence;	
+	byte	m_bUnlockedSentence;
+
+	bool	m_bForceClosed;			// If set, always close, even if we're blocked.
+	bool	m_bDoorGroup;
+	bool	m_bLocked;				// Whether the door is locked
+	bool	m_bIgnoreDebris;
+	bool	m_bIgnoreNonPlayerEntsOnBlock;	// Non-player entities should never block.  This variable needs more letters.
+	
+	FuncDoorSpawnPos_t m_eSpawnPosition;
+
+	float	m_flBlockDamage;		// Damage inflicted when blocked.
+	string_t	m_NoiseMoving;		//Start/Looping sound
+	string_t	m_NoiseArrived;		//End sound
+	string_t	m_NoiseMovingClosed;		//Start/Looping sound
+	string_t	m_NoiseArrivedClosed;		//End sound
+	string_t	m_ChainTarget;		///< Entity name to pass Touch and Use events to
+
+	CNetworkVar( float, m_flWaveHeight );
+
+	// Outputs
+	COutputEvent m_OnBlockedClosing;		// Triggered when the door becomes blocked while closing.
+	COutputEvent m_OnBlockedOpening;		// Triggered when the door becomes blocked while opening.
+	COutputEvent m_OnUnblockedClosing;		// Triggered when the door becomes unblocked while closing.
+	COutputEvent m_OnUnblockedOpening;		// Triggered when the door becomes unblocked while opening.
+	COutputEvent m_OnFullyClosed;			// Triggered when the door reaches the fully closed position.
+	COutputEvent m_OnFullyOpen;				// Triggered when the door reaches the fully open position.
+	COutputEvent m_OnClose;					// Triggered when the door is told to close.
+	COutputEvent m_OnOpen;					// Triggered when the door is told to open.
+	COutputEvent m_OnLockedUse;				// Triggered when the user tries to open a locked door.
+
+	void			StartMovingSound( void );
+	virtual void	StopMovingSound( void );
+	void			MovingSoundThink( void );
+#ifdef HL1_DLL
+	bool		PassesBlockTouchFilter(CBaseEntity *pOther);
+	string_t	m_iBlockFilterName;
+	EHANDLE		m_hBlockFilter;
+#endif
+	
+	bool		ShouldLoopMoveSound( void ) { return m_bLoopMoveSound; }
+	bool		m_bLoopMoveSound;			// Move sound loops until stopped
+
+	virtual bool ShouldBlockNav() const OVERRIDE { return false; }
+
+private:
+	void ChainUse( void );	///< Chains +use on through to m_ChainTarget
+	void ChainTouch( CBaseEntity *pOther );	///< Chains touch on through to m_ChainTarget
+	void SetChaining( bool chaining )	{ m_isChaining = chaining; }	///< Latch to prevent recursion
+	bool m_isChaining;
+
+	void CloseAreaPortalsThink( void );	///< Delays turning off area portals when closing doors to prevent visual artifacts
+};
+
+#endif // DOORS_H