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game/server/tf2/fire_damage_mgr.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef FIRE_DAMAGE_MGR_H
+#define FIRE_DAMAGE_MGR_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "igamesystem.h"
+#include "utllinkedlist.h"
+#include "ehandle.h"
+
+
+class CEntityBurnEffect;
+
+
+// ------------------------------------------------------------------------------------------ //
+// CFireDamageMgr.
+//
+// This class manages fire damage being applied to entities. It uses velocity, acceleration,
+// and decay to model fire damage building up, and it puts a cap on the maximum amount of damage
+// an entity can take from fire during a given frame.
+// ------------------------------------------------------------------------------------------ //
+
+class CFireDamageMgr : public CAutoGameSystem
+{
+// Overrides.
+public:
+
+	virtual bool	Init();
+	virtual void	FrameUpdatePostEntityThink();
+
+
+public:
+	// Apply fire damage to an entity. flDamageAccel is in units per second, so in the absence of
+	// decay, it equals velocity increase per second.
+	//
+	// NOTE: the damage acceleration should always be greater than the decay per second, or no damage
+	//       will be applied since it will decay faster than 
+	void		AddDamage( CBaseEntity *pTarget, CBaseEntity *pAttacker, float flDamageAccel, bool bMakeBurnEffect );
+
+
+private:
+	class CDamageAttacker
+	{
+	public:
+		void	Init( CBaseEntity *pAttacker, float flVelocity )
+		{
+			m_hAttacker = pAttacker;
+			m_flVelocity = flVelocity;
+			m_flDamageSum = 0;
+		}		
+		
+		EHANDLE	m_hAttacker;
+		float	m_flVelocity;	// Current damage velocity.
+		
+		float	m_flDamageSum;	// Damage is summed up and applied a couple times per second instead of 
+								// each frame since fractional damage is rounded to 1.
+	};
+
+	class CDamageEnt
+	{
+	public:
+		enum
+		{
+			MAX_ATTACKERS = 4
+		};
+
+		bool				m_bWasAlive;
+
+		EHANDLE				m_hEnt;
+		CHandle<CEntityBurnEffect>	m_pBurnEffect;
+		
+		// Each attacker gets credit for a portion of 
+		CDamageAttacker	m_Attackers[MAX_ATTACKERS];
+		int				m_nAttackers;
+	};
+
+
+private:
+
+	void		ApplyCollectedDamage( CFireDamageMgr::CDamageEnt *pEnt, int iAttacker );
+	void		RemoveDamageEnt( int iEnt );
+
+
+private:
+	
+	CUtlLinkedList<CDamageEnt,int>	m_DamageEnts;
+
+	float	m_flMaxDamagePerSecond;
+	float 	m_flDecayConstant;
+
+	// This counts down to zero so we only apply fire damage every so often.
+	float	m_flApplyDamageCountdown;
+};
+
+
+// Returns true if the entity is burnable by the specified team.
+bool IsBurnableEnt( CBaseEntity *pEntity, int iTeam );
+
+
+// This is used by the flamethrower and the burning gasoline blobs to find entities to burn.
+int FindBurnableEntsInSphere(
+	CBaseEntity **ents,
+	float *dists,
+	int nMaxEnts,
+	const Vector &vecCenter,
+	float flSearchRadius,
+	CBaseEntity *pOwner );
+
+
+CFireDamageMgr* GetFireDamageMgr();
+
+
+#endif // FIRE_DAMAGE_MGR_H