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game/server/basecombatweapon.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================//
+
+#include "cbase.h"
+#include "ai_basenpc.h"
+#include "animation.h"
+#include "basecombatweapon.h"
+#include "player.h"			// For gEvilImpulse101 / CBasePlayer
+#include "gamerules.h"		// For g_pGameRules
+#include <KeyValues.h>
+#include "ammodef.h"
+#include "baseviewmodel.h"
+#include "in_buttons.h"
+#include "soundent.h"
+#include "weapon_parse.h"
+#include "game.h"
+#include "engine/IEngineSound.h"
+#include "sendproxy.h"
+#include "tier1/strtools.h"
+#include "vphysics/constraints.h"
+#include "npcevent.h"
+#include "igamesystem.h"
+#include "collisionutils.h"
+#include "iservervehicle.h"
+#include "func_break.h"
+
+#ifdef HL2MP
+	#include "hl2mp_gamerules.h"
+#endif
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+extern int	gEvilImpulse101;		// In Player.h
+
+// -----------------------------------------
+//	Sprite Index info
+// -----------------------------------------
+short		g_sModelIndexLaser;			// holds the index for the laser beam
+const char	*g_pModelNameLaser = "sprites/laserbeam.vmt";
+short		g_sModelIndexLaserDot;		// holds the index for the laser beam dot
+short		g_sModelIndexFireball;		// holds the index for the fireball
+short		g_sModelIndexSmoke;			// holds the index for the smoke cloud
+short		g_sModelIndexWExplosion;	// holds the index for the underwater explosion
+short		g_sModelIndexBubbles;		// holds the index for the bubbles model
+short		g_sModelIndexBloodDrop;		// holds the sprite index for the initial blood
+short		g_sModelIndexBloodSpray;	// holds the sprite index for splattered blood
+
+
+ConVar weapon_showproficiency( "weapon_showproficiency", "0" );
+extern ConVar ai_debug_shoot_positions;
+
+//-----------------------------------------------------------------------------
+// Purpose: Precache global weapon sounds
+//-----------------------------------------------------------------------------
+void W_Precache(void)
+{
+	PrecacheFileWeaponInfoDatabase( filesystem, g_pGameRules->GetEncryptionKey() );
+
+
+
+#ifdef HL1_DLL
+	g_sModelIndexWExplosion = CBaseEntity::PrecacheModel ("sprites/WXplo1.vmt");// underwater fireball
+	g_sModelIndexBloodSpray = CBaseEntity::PrecacheModel ("sprites/bloodspray.vmt"); // initial blood
+	g_sModelIndexBloodDrop = CBaseEntity::PrecacheModel ("sprites/blood.vmt"); // splattered blood 
+	g_sModelIndexLaserDot = CBaseEntity::PrecacheModel("sprites/laserdot.vmt");
+#endif // HL1_DLL
+
+#ifndef TF_DLL
+	g_sModelIndexFireball = CBaseEntity::PrecacheModel ("sprites/zerogxplode.vmt");// fireball
+
+	g_sModelIndexSmoke = CBaseEntity::PrecacheModel ("sprites/steam1.vmt");// smoke
+	g_sModelIndexBubbles = CBaseEntity::PrecacheModel ("sprites/bubble.vmt");//bubbles
+	g_sModelIndexLaser = CBaseEntity::PrecacheModel( (char *)g_pModelNameLaser );
+
+	PrecacheParticleSystem( "blood_impact_red_01" );
+	PrecacheParticleSystem( "blood_impact_green_01" );
+	PrecacheParticleSystem( "blood_impact_yellow_01" );
+
+	CBaseEntity::PrecacheModel ("effects/bubble.vmt");//bubble trails
+
+	CBaseEntity::PrecacheModel("models/weapons/w_bullet.mdl");
+#endif
+
+	CBaseEntity::PrecacheScriptSound( "BaseCombatWeapon.WeaponDrop" );
+	CBaseEntity::PrecacheScriptSound( "BaseCombatWeapon.WeaponMaterialize" );
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Transmit weapon data
+//-----------------------------------------------------------------------------
+int CBaseCombatWeapon::UpdateTransmitState( void)
+{
+	// If the weapon is being carried by a CBaseCombatCharacter, let the combat character do the logic
+	// about whether or not to transmit it.
+	if ( GetOwner() )
+	{	
+		return SetTransmitState( FL_EDICT_PVSCHECK );
+	}
+	else
+	{
+		// If it's just lying around, then use CBaseEntity's visibility test to see if it should be sent.
+		return BaseClass::UpdateTransmitState();
+	}
+}
+
+
+void CBaseCombatWeapon::Operator_FrameUpdate( CBaseCombatCharacter *pOperator )
+{
+	StudioFrameAdvance( ); // animate
+
+	if ( IsSequenceFinished() )
+	{
+		if ( SequenceLoops() )
+		{
+			// animation does loop, which means we're playing subtle idle. Might need to fidget.
+			int iSequence = SelectWeightedSequence( GetActivity() );
+			if ( iSequence != ACTIVITY_NOT_AVAILABLE )
+			{
+				ResetSequence( iSequence );	// Set to new anim (if it's there)
+			}
+		}
+#if 0
+		else
+		{
+			// animation that just ended doesn't loop! That means we just finished a fidget
+			// and should return to our heaviest weighted idle (the subtle one)
+			SelectHeaviestSequence( GetActivity() );
+		}
+#endif
+	}
+
+	// Animation events are passed back to the weapon's owner/operator
+	DispatchAnimEvents( pOperator );
+
+	// Update and dispatch the viewmodel events
+	CBasePlayer *pOwner = ToBasePlayer( GetOwner() );
+
+	if ( pOwner == NULL )
+		return;
+
+	CBaseViewModel *vm = pOwner->GetViewModel( m_nViewModelIndex );
+	
+	if ( vm != NULL )
+	{
+		vm->StudioFrameAdvance();
+		vm->DispatchAnimEvents( this );
+	}
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : *pEvent - 
+//			*pOperator - 
+//-----------------------------------------------------------------------------
+void CBaseCombatWeapon::Operator_HandleAnimEvent( animevent_t *pEvent, CBaseCombatCharacter *pOperator )
+{
+	if ( (pEvent->type & AE_TYPE_NEWEVENTSYSTEM) && (pEvent->type & AE_TYPE_SERVER) )
+	{
+		if ( pEvent->event == AE_NPC_WEAPON_FIRE )
+		{
+			bool bSecondary = (atoi( pEvent->options ) != 0);
+			Operator_ForceNPCFire( pOperator, bSecondary );
+			return;
+		}
+		else if ( pEvent->event == AE_WPN_PLAYWPNSOUND )
+		{
+			int iSnd = GetWeaponSoundFromString(pEvent->options);
+			if ( iSnd != -1 )
+			{
+				WeaponSound( (WeaponSound_t)iSnd );
+			}
+		}
+	}
+
+	DevWarning( 2, "Unhandled animation event %d from %s --> %s\n", pEvent->event, pOperator->GetClassname(), GetClassname() );
+}
+
+// NOTE: This should never be called when a character is operating the weapon.  Animation events should be
+// routed through the character, and then back into CharacterAnimEvent() 
+void CBaseCombatWeapon::HandleAnimEvent( animevent_t *pEvent )
+{
+	//If the player is receiving this message, pass it through
+	CBasePlayer *pOwner = ToBasePlayer( GetOwner() );
+
+	if ( pOwner != NULL )
+	{
+		Operator_HandleAnimEvent( pEvent, pOwner );
+	}
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Make the weapon visible and tangible
+//-----------------------------------------------------------------------------
+CBaseEntity* CBaseCombatWeapon::Respawn( void )
+{
+	// make a copy of this weapon that is invisible and inaccessible to players (no touch function). The weapon spawn/respawn code
+	// will decide when to make the weapon visible and touchable.
+	CBaseEntity *pNewWeapon = CBaseEntity::Create( GetClassname(), g_pGameRules->VecWeaponRespawnSpot( this ), GetLocalAngles(), GetOwnerEntity() );
+
+	if ( pNewWeapon )
+	{
+		pNewWeapon->AddEffects( EF_NODRAW );// invisible for now
+		pNewWeapon->SetTouch( NULL );// no touch
+		pNewWeapon->SetThink( &CBaseCombatWeapon::AttemptToMaterialize );
+
+		UTIL_DropToFloor( this, MASK_SOLID );
+
+		// not a typo! We want to know when the weapon the player just picked up should respawn! This new entity we created is the replacement,
+		// but when it should respawn is based on conditions belonging to the weapon that was taken.
+		pNewWeapon->SetNextThink( gpGlobals->curtime + g_pGameRules->FlWeaponRespawnTime( this ) );
+	}
+	else
+	{
+		Warning("Respawn failed to create %s!\n", GetClassname() );
+	}
+
+	return pNewWeapon;
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Weapons ignore other weapons when LOS tracing
+//-----------------------------------------------------------------------------
+class CWeaponLOSFilter : public CTraceFilterSkipTwoEntities
+{
+	DECLARE_CLASS( CWeaponLOSFilter, CTraceFilterSkipTwoEntities );
+public:
+	CWeaponLOSFilter( IHandleEntity *pHandleEntity, IHandleEntity *pHandleEntity2, int collisionGroup ) :
+	  CTraceFilterSkipTwoEntities( pHandleEntity, pHandleEntity2, collisionGroup ), m_pVehicle( NULL )
+	{
+		// If the tracing entity is in a vehicle, then ignore it
+		if ( pHandleEntity != NULL )
+		{
+			CBaseCombatCharacter *pBCC = ((CBaseEntity *)pHandleEntity)->MyCombatCharacterPointer();
+			if ( pBCC != NULL )
+			{
+				m_pVehicle = pBCC->GetVehicleEntity();
+			}
+		}
+	}
+	virtual bool ShouldHitEntity( IHandleEntity *pServerEntity, int contentsMask )
+	{
+		CBaseEntity *pEntity = (CBaseEntity *)pServerEntity;
+
+		if ( pEntity->GetCollisionGroup() == COLLISION_GROUP_WEAPON )
+			return false;
+
+		// Don't collide with the tracing entity's vehicle (if it exists)
+		if ( pServerEntity == m_pVehicle )
+			return false;
+
+		if ( pEntity->GetHealth() > 0 )
+		{
+			CBreakable *pBreakable = dynamic_cast<CBreakable *>(pEntity);
+			if ( pBreakable  && pBreakable->IsBreakable() && pBreakable->GetMaterialType() == matGlass)
+			{
+				return false;
+			}
+		}
+
+		return BaseClass::ShouldHitEntity( pServerEntity, contentsMask );
+	}
+
+private:
+	CBaseEntity *m_pVehicle;
+};
+
+//-----------------------------------------------------------------------------
+// Purpose: Check the weapon LOS for an owner at an arbitrary position
+//			If bSetConditions is true, LOS related conditions will also be set
+//-----------------------------------------------------------------------------
+bool CBaseCombatWeapon::WeaponLOSCondition( const Vector &ownerPos, const Vector &targetPos, bool bSetConditions )
+{
+	// --------------------
+	// Check for occlusion
+	// --------------------
+	CAI_BaseNPC* npcOwner = m_hOwner.Get()->MyNPCPointer();
+
+	// Find its relative shoot position
+	Vector vecRelativeShootPosition;
+	VectorSubtract( npcOwner->Weapon_ShootPosition(), npcOwner->GetAbsOrigin(), vecRelativeShootPosition );
+	Vector barrelPos = ownerPos + vecRelativeShootPosition;
+
+	// FIXME: If we're in a vehicle, we need some sort of way to handle shooting out of them
+
+	// Use the custom LOS trace filter
+	CWeaponLOSFilter traceFilter( m_hOwner.Get(), npcOwner->GetEnemy(), COLLISION_GROUP_BREAKABLE_GLASS );
+	trace_t tr;
+	UTIL_TraceLine( barrelPos, targetPos, MASK_SHOT, &traceFilter, &tr );
+
+	// See if we completed the trace without interruption
+	if ( tr.fraction == 1.0 )
+	{
+		if ( ai_debug_shoot_positions.GetBool() )
+		{
+			NDebugOverlay::Line( barrelPos, targetPos, 0, 255, 0, false, 1.0 );
+		}
+
+		return true;
+	}
+
+	CBaseEntity	*pHitEnt = tr.m_pEnt;
+
+	CBasePlayer *pEnemyPlayer = ToBasePlayer( npcOwner->GetEnemy() );
+
+	// is player in a vehicle? if so, verify vehicle is target and return if so (so npc shoots at vehicle)
+	if ( pEnemyPlayer && pEnemyPlayer->IsInAVehicle() )
+	{
+		// Ok, player in vehicle, check if vehicle is target we're looking at, fire if it is
+		// Also, check to see if the owner of the entity is the vehicle, in which case it's valid too.
+		// This catches vehicles that use bone followers.
+		CBaseEntity	*pVehicle  = pEnemyPlayer->GetVehicle()->GetVehicleEnt();
+		if ( pHitEnt == pVehicle || pHitEnt->GetOwnerEntity() == pVehicle )
+			return true;
+	}
+
+	// Hitting our enemy is a success case
+	if ( pHitEnt == npcOwner->GetEnemy() )
+	{
+		if ( ai_debug_shoot_positions.GetBool() )
+		{
+			NDebugOverlay::Line( barrelPos, targetPos, 0, 255, 0, false, 1.0 );
+		}
+
+		return true;
+	}
+
+	// If a vehicle is blocking the view, grab its driver and use that as the combat character
+	CBaseCombatCharacter *pBCC;
+	IServerVehicle *pVehicle = pHitEnt->GetServerVehicle();
+	if ( pVehicle )
+	{
+		pBCC = pVehicle->GetPassenger( );
+	}
+	else
+	{
+		pBCC = ToBaseCombatCharacter( pHitEnt );
+	}
+
+	if ( pBCC ) 
+	{
+		if ( npcOwner->IRelationType( pBCC ) == D_HT )
+			return true;
+
+		if ( bSetConditions )
+		{
+			npcOwner->SetCondition( COND_WEAPON_BLOCKED_BY_FRIEND );
+		}
+	}
+	else if ( bSetConditions )
+	{
+		npcOwner->SetCondition( COND_WEAPON_SIGHT_OCCLUDED );
+		npcOwner->SetEnemyOccluder( pHitEnt );
+
+		if( ai_debug_shoot_positions.GetBool() )
+		{
+			NDebugOverlay::Line( tr.startpos, tr.endpos, 255, 0, 0, false, 1.0 );
+		}
+	}
+
+	return false;
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Base class always returns not bits
+//-----------------------------------------------------------------------------
+int CBaseCombatWeapon::WeaponRangeAttack1Condition( float flDot, float flDist )
+{
+ 	if ( UsesPrimaryAmmo() && !HasPrimaryAmmo() )
+ 	{
+ 		return COND_NO_PRIMARY_AMMO;
+ 	}
+ 	else if ( flDist < m_fMinRange1) 
+ 	{
+ 		return COND_TOO_CLOSE_TO_ATTACK;
+ 	}
+ 	else if (flDist > m_fMaxRange1) 
+ 	{
+ 		return COND_TOO_FAR_TO_ATTACK;
+ 	}
+ 	else if (flDot < 0.5) 	// UNDONE: Why check this here? Isn't the AI checking this already?
+ 	{
+ 		return COND_NOT_FACING_ATTACK;
+ 	}
+
+ 	return COND_CAN_RANGE_ATTACK1;
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Base class always returns not bits
+//-----------------------------------------------------------------------------
+int CBaseCombatWeapon::WeaponRangeAttack2Condition( float flDot, float flDist )
+{
+	// currently disabled
+	return COND_NONE;
+
+	if ( m_bReloadsSingly )
+	{
+		if (m_iClip2 <=0)
+		{
+			return COND_NO_SECONDARY_AMMO;
+		}
+		else if ( flDist < m_fMinRange2) 
+		{
+			return COND_TOO_CLOSE_TO_ATTACK;
+		}
+		else if (flDist > m_fMaxRange2) 
+		{
+			return COND_TOO_FAR_TO_ATTACK;
+		}
+		else if (flDot < 0.5) 
+		{
+			return COND_NOT_FACING_ATTACK;
+		}
+		return COND_CAN_RANGE_ATTACK2;
+	}
+
+	return COND_NONE;
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Base class always returns not bits
+//-----------------------------------------------------------------------------
+int CBaseCombatWeapon::WeaponMeleeAttack1Condition( float flDot, float flDist )
+{
+	return COND_NONE;
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Base class always returns not bits
+//-----------------------------------------------------------------------------
+int CBaseCombatWeapon::WeaponMeleeAttack2Condition( float flDot, float flDist )
+{
+	return COND_NONE;
+}
+
+//====================================================================================
+// WEAPON DROPPING / DESTRUCTION
+//====================================================================================
+void CBaseCombatWeapon::Delete( void )
+{
+	SetTouch( NULL );
+	// FIXME: why doesn't this just remove itself now?
+	SetThink(&CBaseCombatWeapon::SUB_Remove);
+	SetNextThink( gpGlobals->curtime + 0.1f );
+}
+
+void CBaseCombatWeapon::DestroyItem( void )
+{
+	CBaseCombatCharacter *pOwner = m_hOwner.Get();
+
+	if ( pOwner )
+	{
+		// if attached to a player, remove. 
+		pOwner->RemovePlayerItem( this );
+	}
+
+	Kill( );
+}
+
+void CBaseCombatWeapon::Kill( void )
+{
+	SetTouch( NULL );
+	// FIXME: why doesn't this just remove itself now?
+	// FIXME: how is this different than Delete(), and why do they have the same code in them?
+	SetThink(&CBaseCombatWeapon::SUB_Remove);
+	SetNextThink( gpGlobals->curtime + 0.1f );
+}
+
+//====================================================================================
+// FALL TO GROUND
+//====================================================================================
+//-----------------------------------------------------------------------------
+// Purpose: Setup for the fall
+//-----------------------------------------------------------------------------
+void CBaseCombatWeapon::FallInit( void )
+{
+	SetModel( GetWorldModel() );
+	VPhysicsDestroyObject();
+
+	if ( !VPhysicsInitNormal( SOLID_BBOX, GetSolidFlags() | FSOLID_TRIGGER, false ) )
+	{
+		SetMoveType( MOVETYPE_FLYGRAVITY );
+		SetSolid( SOLID_BBOX );
+		AddSolidFlags( FSOLID_TRIGGER );
+	}
+	else
+	{
+#if !defined( CLIENT_DLL )
+		// Constrained start?
+		if ( HasSpawnFlags( SF_WEAPON_START_CONSTRAINED ) )
+		{
+			//Constrain the weapon in place
+			IPhysicsObject *pReferenceObject, *pAttachedObject;
+			
+			pReferenceObject = g_PhysWorldObject;
+			pAttachedObject = VPhysicsGetObject();
+
+			if ( pReferenceObject && pAttachedObject )
+			{
+				constraint_fixedparams_t fixed;
+				fixed.Defaults();
+				fixed.InitWithCurrentObjectState( pReferenceObject, pAttachedObject );
+				
+				fixed.constraint.forceLimit	= lbs2kg( 10000 );
+				fixed.constraint.torqueLimit = lbs2kg( 10000 );
+
+				m_pConstraint = physenv->CreateFixedConstraint( pReferenceObject, pAttachedObject, NULL, fixed );
+
+				m_pConstraint->SetGameData( (void *) this );
+			}
+		}
+#endif //CLIENT_DLL
+	}	
+
+	SetPickupTouch();
+	
+	SetThink( &CBaseCombatWeapon::FallThink );
+
+	SetNextThink( gpGlobals->curtime + 0.1f );
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Items that have just spawned run this think to catch them when 
+//			they hit the ground. Once we're sure that the object is grounded, 
+//			we change its solid type to trigger and set it in a large box that 
+//			helps the player get it.
+//-----------------------------------------------------------------------------
+void CBaseCombatWeapon::FallThink ( void )
+{
+	SetNextThink( gpGlobals->curtime + 0.1f );
+
+	bool shouldMaterialize = false;
+	IPhysicsObject *pPhysics = VPhysicsGetObject();
+	if ( pPhysics )
+	{
+		shouldMaterialize = pPhysics->IsAsleep();
+	}
+	else
+	{
+		shouldMaterialize = (GetFlags() & FL_ONGROUND) ? true : false;
+	}
+
+	if ( shouldMaterialize )
+	{
+		// clatter if we have an owner (i.e., dropped by someone)
+		// don't clatter if the gun is waiting to respawn (if it's waiting, it is invisible!)
+		if ( GetOwnerEntity() )
+		{
+			EmitSound( "BaseCombatWeapon.WeaponDrop" );
+		}
+		Materialize(); 
+	}
+}
+
+//====================================================================================
+// WEAPON SPAWNING
+//====================================================================================
+//-----------------------------------------------------------------------------
+// Purpose: Make a weapon visible and tangible
+//-----------------------------------------------------------------------------// 
+void CBaseCombatWeapon::Materialize( void )
+{
+	if ( IsEffectActive( EF_NODRAW ) )
+	{
+		// changing from invisible state to visible.
+#ifdef HL2MP
+		EmitSound( "AlyxEmp.Charge" );
+#else
+		EmitSound( "BaseCombatWeapon.WeaponMaterialize" );
+#endif
+		
+		RemoveEffects( EF_NODRAW );
+		DoMuzzleFlash();
+	}
+#ifdef HL2MP
+	if ( HasSpawnFlags( SF_NORESPAWN ) == false )
+	{
+		VPhysicsInitNormal( SOLID_BBOX, GetSolidFlags() | FSOLID_TRIGGER, false );
+		SetMoveType( MOVETYPE_VPHYSICS );
+
+		HL2MPRules()->AddLevelDesignerPlacedObject( this );
+	}
+#else
+	SetSolid( SOLID_BBOX );
+	AddSolidFlags( FSOLID_TRIGGER );
+#endif
+
+	SetPickupTouch();
+
+	SetThink (NULL);
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: See if the game rules will let this weapon respawn
+//-----------------------------------------------------------------------------
+void CBaseCombatWeapon::AttemptToMaterialize( void )
+{
+	float time = g_pGameRules->FlWeaponTryRespawn( this );
+
+	if ( time == 0 )
+	{
+		Materialize();
+		return;
+	}
+
+	SetNextThink( gpGlobals->curtime + time );
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: Weapon has been picked up, should it respawn?
+//-----------------------------------------------------------------------------
+void CBaseCombatWeapon::CheckRespawn( void )
+{
+	switch ( g_pGameRules->WeaponShouldRespawn( this ) )
+	{
+	case GR_WEAPON_RESPAWN_YES:
+		Respawn();
+		break;
+	case GR_WEAPON_RESPAWN_NO:
+		return;
+		break;
+	}
+}
+
+class CWeaponList : public CAutoGameSystem
+{
+public:
+	CWeaponList( char const *name ) : CAutoGameSystem( name )
+	{
+	}
+
+
+	virtual void LevelShutdownPostEntity()  
+	{ 
+		m_list.Purge();
+	}
+
+	void AddWeapon( CBaseCombatWeapon *pWeapon )
+	{
+		m_list.AddToTail( pWeapon );
+	}
+
+	void RemoveWeapon( CBaseCombatWeapon *pWeapon )
+	{
+		m_list.FindAndRemove( pWeapon );
+	}
+	CUtlLinkedList< CBaseCombatWeapon * > m_list;
+};
+
+CWeaponList g_WeaponList( "CWeaponList" );
+
+void OnBaseCombatWeaponCreated( CBaseCombatWeapon *pWeapon )
+{
+	g_WeaponList.AddWeapon( pWeapon );
+}
+
+void OnBaseCombatWeaponDestroyed( CBaseCombatWeapon *pWeapon )
+{
+	g_WeaponList.RemoveWeapon( pWeapon );
+}
+
+int CBaseCombatWeapon::GetAvailableWeaponsInBox( CBaseCombatWeapon **pList, int listMax, const Vector &mins, const Vector &maxs )
+{
+	// linear search all weapons
+	int count = 0;
+	int index = g_WeaponList.m_list.Head();
+	while ( index != g_WeaponList.m_list.InvalidIndex() )
+	{
+		CBaseCombatWeapon *pWeapon = g_WeaponList.m_list[index];
+		// skip any held weapon
+		if ( !pWeapon->GetOwner() )
+		{
+			// restrict to mins/maxs
+			if ( IsPointInBox( pWeapon->GetAbsOrigin(), mins, maxs ) )
+			{
+				if ( count < listMax )
+				{
+					pList[count] = pWeapon;
+					count++;
+				}
+			}
+		}
+		index = g_WeaponList.m_list.Next( index );
+	}
+
+	return count;
+}
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+int	CBaseCombatWeapon::ObjectCaps( void )
+{ 
+	int caps = BaseClass::ObjectCaps();
+	if ( !IsFollowingEntity() && !HasSpawnFlags(SF_WEAPON_NO_PLAYER_PICKUP) )
+	{
+		caps |= FCAP_IMPULSE_USE;
+	}
+
+	return caps;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+void CBaseCombatWeapon::Use( CBaseEntity *pActivator, CBaseEntity *pCaller, USE_TYPE useType, float value )
+{
+	CBasePlayer *pPlayer = ToBasePlayer( pActivator );
+	
+	if ( pPlayer )
+	{
+		m_OnPlayerUse.FireOutput( pActivator, pCaller );
+
+		//
+		// Bump the weapon to try equipping it before picking it up physically. This is
+		// important in a few spots in the game where the player could potentially +use pickup
+		// and then THROW AWAY a vital weapon, rendering them unable to continue the game.
+		//
+		if ( pPlayer->BumpWeapon( this ) )
+		{
+			OnPickedUp( pPlayer );
+		}
+		else
+		{
+			pPlayer->PickupObject( this );
+		}
+	}
+}
+