halflife25-sdk/dmc/dlls/combat.cpp

/***
*
*	Copyright (c) 1996-2002, Valve LLC. All rights reserved.
*	
*	This product contains software technology licensed from Id 
*	Software, Inc. ("Id Technology").  Id Technology (c) 1996 Id Software, Inc. 
*	All Rights Reserved.
*
*   Use, distribution, and modification of this source code and/or resulting
*   object code is restricted to non-commercial enhancements to products from
*   Valve LLC.  All other use, distribution, or modification is prohibited
*   without written permission from Valve LLC.
*
****/
/*

===== combat.cpp ========================================================

  functions dealing with damage infliction & death

*/

#include "extdll.h"
#include "util.h"
#include "cbase.h"
#include "monsters.h"
#include "soundent.h"
#include "decals.h"
#include "animation.h"
#include "weapons.h"
#include "func_break.h"
#include "player.h"

extern DLL_GLOBAL Vector		g_vecAttackDir;
extern DLL_GLOBAL int			g_iSkillLevel;

extern Vector VecBModelOrigin( entvars_t* pevBModel );
extern entvars_t *g_pevLastInflictor;

unsigned short g_sGibbed;
unsigned short g_sTeleport;
unsigned short g_sTrail;
unsigned short g_sExplosion;
unsigned short g_usPowerUp;

#define GERMAN_GIB_COUNT		4
#define	HUMAN_GIB_COUNT			6
#define ALIEN_GIB_COUNT			4


// HACKHACK -- The gib velocity equations don't work
void CGib :: LimitVelocity( void )
{
	float length = pev->velocity.Length();

	// ceiling at 1500.  The gib velocity equation is not bounded properly.  Rather than tune it
	// in 3 separate places again, I'll just limit it here.
	if ( length > 1500.0 )
		pev->velocity = pev->velocity.Normalize() * 1500;		// This should really be sv_maxvelocity * 0.75 or something
}


void CGib :: SpawnStickyGibs( entvars_t *pevVictim, Vector vecOrigin, int cGibs )
{
	int i;

	if ( g_Language == LANGUAGE_GERMAN )
	{
		// no sticky gibs in germany right now!
		return; 
	}

	for ( i = 0 ; i < cGibs ; i++ )
	{
		CGib *pGib = GetClassPtr( (CGib *)NULL );

		pGib->Spawn( "models/stickygib.mdl" );
		pGib->pev->body = RANDOM_LONG(0,2);

		if ( pevVictim )
		{
			pGib->pev->origin.x = vecOrigin.x + RANDOM_FLOAT( -3, 3 );
			pGib->pev->origin.y = vecOrigin.y + RANDOM_FLOAT( -3, 3 );
			pGib->pev->origin.z = vecOrigin.z + RANDOM_FLOAT( -3, 3 );

			/*
			pGib->pev->origin.x = pevVictim->absmin.x + pevVictim->size.x * (RANDOM_FLOAT ( 0 , 1 ) );
			pGib->pev->origin.y = pevVictim->absmin.y + pevVictim->size.y * (RANDOM_FLOAT ( 0 , 1 ) );
			pGib->pev->origin.z = pevVictim->absmin.z + pevVictim->size.z * (RANDOM_FLOAT ( 0 , 1 ) );
			*/

			// make the gib fly away from the attack vector
			pGib->pev->velocity = g_vecAttackDir * -1;

			// mix in some noise
			pGib->pev->velocity.x += RANDOM_FLOAT ( -0.15, 0.15 );
			pGib->pev->velocity.y += RANDOM_FLOAT ( -0.15, 0.15 );
			pGib->pev->velocity.z += RANDOM_FLOAT ( -0.15, 0.15 );

			pGib->pev->velocity = pGib->pev->velocity * 900;

			pGib->pev->avelocity.x = RANDOM_FLOAT ( 250, 400 );
			pGib->pev->avelocity.y = RANDOM_FLOAT ( 250, 400 );

			// copy owner's blood color
			pGib->m_bloodColor = (CBaseEntity::Instance(pevVictim))->BloodColor();
		
			if ( pevVictim->health > -50)
			{
				pGib->pev->velocity = pGib->pev->velocity * 0.7;
			}
			else if ( pevVictim->health > -200)
			{
				pGib->pev->velocity = pGib->pev->velocity * 2;
			}
			else
			{
				pGib->pev->velocity = pGib->pev->velocity * 4;
			}

			
			pGib->pev->movetype = MOVETYPE_TOSS;
			pGib->pev->solid = SOLID_BBOX;
			UTIL_SetSize ( pGib->pev, Vector ( 0, 0 ,0 ), Vector ( 0, 0, 0 ) );
			pGib->SetTouch ( &CGib::StickyGibTouch );
			pGib->SetThink (NULL);
		}
		pGib->LimitVelocity();
	}
}

void CGib :: SpawnHeadGib( entvars_t *pevVictim )
{
	CGib *pGib = GetClassPtr( (CGib *)NULL );

	if ( g_Language == LANGUAGE_GERMAN )
	{
		pGib->Spawn( "models/germangibs.mdl" );// throw one head
		pGib->pev->body = 0;
	}
	else
	{
		pGib->Spawn( "models/hgibs.mdl" );// throw one head
		pGib->pev->body = 0;
	}

	if ( pevVictim )
	{
		pGib->pev->origin = pevVictim->origin + pevVictim->view_ofs;
		
		edict_t		*pentPlayer = FIND_CLIENT_IN_PVS( pGib->edict() );
		
		if ( RANDOM_LONG ( 0, 100 ) <= 5 && pentPlayer )
		{
			// 5% chance head will be thrown at player's face.
			entvars_t	*pevPlayer;

			pevPlayer = VARS( pentPlayer );
			pGib->pev->velocity = ( ( pevPlayer->origin + pevPlayer->view_ofs ) - pGib->pev->origin ).Normalize() * 300;
			pGib->pev->velocity.z += 100;
		}
		else
		{
			pGib->pev->velocity = Vector (RANDOM_FLOAT(-100,100), RANDOM_FLOAT(-100,100), RANDOM_FLOAT(200,300));
		}


		pGib->pev->avelocity.x = RANDOM_FLOAT ( 100, 200 );
		pGib->pev->avelocity.y = RANDOM_FLOAT ( 100, 300 );

		// copy owner's blood color
		pGib->m_bloodColor = (CBaseEntity::Instance(pevVictim))->BloodColor();
	
		if ( pevVictim->health > -50)
		{
			pGib->pev->velocity = pGib->pev->velocity * 0.7;
		}
		else if ( pevVictim->health > -200)
		{
			pGib->pev->velocity = pGib->pev->velocity * 2;
		}
		else
		{
			pGib->pev->velocity = pGib->pev->velocity * 4;
		}
	}
	pGib->LimitVelocity();
}

void CGib :: SpawnRandomGibs( entvars_t *pevVictim, int cGibs, int human )
{
	int cSplat;

	for ( cSplat = 0 ; cSplat < cGibs ; cSplat++ )
	{
		CGib *pGib = GetClassPtr( (CGib *)NULL );

		if ( g_Language == LANGUAGE_GERMAN )
		{
			pGib->Spawn( "models/germangibs.mdl" );
			pGib->pev->body = RANDOM_LONG(0,GERMAN_GIB_COUNT-1);
		}
		else
		{
			if ( human )
			{
				// human pieces
				pGib->Spawn( "models/hgibs.mdl" );
				pGib->pev->body = RANDOM_LONG(1,HUMAN_GIB_COUNT-1);// start at one to avoid throwing random amounts of skulls (0th gib)
			}
			else
			{
				// aliens
				pGib->Spawn( "models/agibs.mdl" );
				pGib->pev->body = RANDOM_LONG(0,ALIEN_GIB_COUNT-1);
			}
		}

		if ( pevVictim )
		{
			// spawn the gib somewhere in the monster's bounding volume
			pGib->pev->origin.x = pevVictim->absmin.x + pevVictim->size.x * (RANDOM_FLOAT ( 0 , 1 ) );
			pGib->pev->origin.y = pevVictim->absmin.y + pevVictim->size.y * (RANDOM_FLOAT ( 0 , 1 ) );
			pGib->pev->origin.z = pevVictim->absmin.z + pevVictim->size.z * (RANDOM_FLOAT ( 0 , 1 ) ) + 1;	// absmin.z is in the floor because the engine subtracts 1 to enlarge the box

			// make the gib fly away from the attack vector
			pGib->pev->velocity = g_vecAttackDir * -1;

			// mix in some noise
			pGib->pev->velocity.x += RANDOM_FLOAT ( -0.25, 0.25 );
			pGib->pev->velocity.y += RANDOM_FLOAT ( -0.25, 0.25 );
			pGib->pev->velocity.z += RANDOM_FLOAT ( -0.25, 0.25 );

			pGib->pev->velocity = pGib->pev->velocity * RANDOM_FLOAT ( 300, 400 );

			pGib->pev->avelocity.x = RANDOM_FLOAT ( 100, 200 );
			pGib->pev->avelocity.y = RANDOM_FLOAT ( 100, 300 );

			// copy owner's blood color
			pGib->m_bloodColor = (CBaseEntity::Instance(pevVictim))->BloodColor();
			
			if ( pevVictim->health > -50)
			{
				pGib->pev->velocity = pGib->pev->velocity * 0.7;
			}
			else if ( pevVictim->health > -200)
			{
				pGib->pev->velocity = pGib->pev->velocity * 2;
			}
			else
			{
				pGib->pev->velocity = pGib->pev->velocity * 4;
			}

			pGib->pev->solid = SOLID_BBOX;
			UTIL_SetSize ( pGib->pev, Vector( 0 , 0 , 0 ), Vector ( 0, 0, 0 ) );
		}
		pGib->LimitVelocity();
	}
}

//=========================================================
// WaitTillLand - in order to emit their meaty scent from
// the proper location, gibs should wait until they stop 
// bouncing to emit their scent. That's what this function
// does.
//=========================================================
void CGib :: WaitTillLand ( void )
{
	if (!IsInWorld())
	{
		UTIL_Remove( this );
		return;
	}

	if ( pev->velocity == g_vecZero )
	{
		SetThink (&CGib::SUB_StartFadeOut);
		pev->nextthink = gpGlobals->time + m_lifeTime;
	}
	else
	{
		// wait and check again in another half second.
		pev->nextthink = gpGlobals->time + 0.5;
	}
}

//
// Gib bounces on the ground or wall, sponges some blood down, too!
//
void CGib :: BounceGibTouch ( CBaseEntity *pOther )
{
	Vector	vecSpot;
	TraceResult	tr;
	
	//if ( RANDOM_LONG(0,1) )
	//	return;// don't bleed everytime

	if (pev->flags & FL_ONGROUND)
	{
		pev->velocity = pev->velocity * 0.9;
		pev->angles.x = 0;
		pev->angles.z = 0;
		pev->avelocity.x = 0;
		pev->avelocity.z = 0;
	}
	else
	{
		if ( g_Language != LANGUAGE_GERMAN && m_cBloodDecals > 0 && m_bloodColor != DONT_BLEED )
		{
			vecSpot = pev->origin + Vector ( 0 , 0 , 8 );//move up a bit, and trace down.
			UTIL_TraceLine ( vecSpot, vecSpot + Vector ( 0, 0, -24 ),  ignore_monsters, ENT(pev), & tr);

			UTIL_BloodDecalTrace( &tr, m_bloodColor );

			m_cBloodDecals--; 
		}

		if ( m_material != matNone && RANDOM_LONG(0,2) == 0 )
		{
			float volume;
			float zvel = fabs(pev->velocity.z);
		
			volume = 0.8 * min(1.0, ((float)zvel) / 450.0);

			CBreakable::MaterialSoundRandom( edict(), (Materials)m_material, volume );
		}
	}
}

//
// Sticky gib puts blood on the wall and stays put. 
//
void CGib :: StickyGibTouch ( CBaseEntity *pOther )
{
	Vector	vecSpot;
	TraceResult	tr;
	
	SetThink ( &CGib::SUB_Remove );
	pev->nextthink = gpGlobals->time + 10;

	if ( !FClassnameIs( pOther->pev, "worldspawn" ) )
	{
		pev->nextthink = gpGlobals->time;
		return;
	}

	UTIL_TraceLine ( pev->origin, pev->origin + pev->velocity * 32,  ignore_monsters, ENT(pev), & tr);

	UTIL_BloodDecalTrace( &tr, m_bloodColor );

	pev->velocity = tr.vecPlaneNormal * -1;
	pev->angles = UTIL_VecToAngles ( pev->velocity );
	pev->velocity = g_vecZero; 
	pev->avelocity = g_vecZero;
	pev->movetype = MOVETYPE_NONE;
}

//=========================================================
// GibMonster - create some gore and get rid of a monster's
// model.
//=========================================================
void CBaseMonster :: GibMonster( void )
{
	TraceResult	tr;
	BOOL		gibbed = FALSE;

	EMIT_SOUND(ENT(pev), CHAN_WEAPON, "common/bodysplat.wav", 1, ATTN_NORM);		

	if ( CVAR_GET_FLOAT("violence_hgibs") != 0 )	// Only the player will ever get here
	{
		if ( IsPlayer() )
		{
			PLAYBACK_EVENT_FULL ( FEV_GLOBAL, edict(), 
			g_sGibbed, 0.0, (float *)&pev->origin, (float *)&g_vecAttackDir, 0.0, 0.0, 0, 0, 0, 0);
		}

		/*CGib::SpawnHeadGib( pev );
		CGib::SpawnRandomGibs( pev, 4, 1 );	// throw some human gibs.*/
	}
	gibbed = TRUE;
}

//=========================================================
// GetDeathActivity - determines the best type of death
// anim to play.
//=========================================================
Activity CBaseMonster :: GetDeathActivity ( void )
{
	Activity	deathActivity;
	BOOL		fTriedDirection;
	float		flDot;
	TraceResult	tr;
	Vector		vecSrc;

	if ( pev->deadflag != DEAD_NO )
	{
		// don't run this while dying.
		return m_IdealActivity;
	}

	vecSrc = Center();

	fTriedDirection = FALSE;
	deathActivity = ACT_DIESIMPLE;// in case we can't find any special deaths to do.

	UTIL_MakeVectors ( pev->angles );
	flDot = DotProduct ( gpGlobals->v_forward, g_vecAttackDir * -1 );

	switch ( m_LastHitGroup )
	{
		// try to pick a region-specific death.
	case HITGROUP_HEAD:
		deathActivity = ACT_DIE_HEADSHOT;
		break;

	case HITGROUP_STOMACH:
		deathActivity = ACT_DIE_GUTSHOT;
		break;

	case HITGROUP_GENERIC:
		// try to pick a death based on attack direction
		fTriedDirection = TRUE;

		if ( flDot > 0.3 )
		{
			deathActivity = ACT_DIEFORWARD;
		}
		else if ( flDot <= -0.3 )
		{
			deathActivity = ACT_DIEBACKWARD;
		}
		break;

	default:
		// try to pick a death based on attack direction
		fTriedDirection = TRUE;

		if ( flDot > 0.3 )
		{
			deathActivity = ACT_DIEFORWARD;
		}
		else if ( flDot <= -0.3 )
		{
			deathActivity = ACT_DIEBACKWARD;
		}
		break;
	}


	// can we perform the prescribed death?
	if ( LookupActivity ( deathActivity ) == ACTIVITY_NOT_AVAILABLE )
	{
		// no! did we fail to perform a directional death? 
		if ( fTriedDirection )
		{
			// if yes, we're out of options. Go simple.
			deathActivity = ACT_DIESIMPLE;
		}
		else
		{
			// cannot perform the ideal region-specific death, so try a direction.
			if ( flDot > 0.3 )
			{
				deathActivity = ACT_DIEFORWARD;
			}
			else if ( flDot <= -0.3 )
			{
				deathActivity = ACT_DIEBACKWARD;
			}
		}
	}

	if ( LookupActivity ( deathActivity ) == ACTIVITY_NOT_AVAILABLE )
	{
		// if we're still invalid, simple is our only option.
		deathActivity = ACT_DIESIMPLE;
	}

	if ( deathActivity == ACT_DIEFORWARD )
	{
			// make sure there's room to fall forward
			UTIL_TraceHull ( vecSrc, vecSrc + gpGlobals->v_forward * 64, dont_ignore_monsters, head_hull, edict(), &tr );

			if ( tr.flFraction != 1.0 )
			{
				deathActivity = ACT_DIESIMPLE;
			}
	}

	if ( deathActivity == ACT_DIEBACKWARD )
	{
			// make sure there's room to fall backward
			UTIL_TraceHull ( vecSrc, vecSrc - gpGlobals->v_forward * 64, dont_ignore_monsters, head_hull, edict(), &tr );

			if ( tr.flFraction != 1.0 )
			{
				deathActivity = ACT_DIESIMPLE;
			}
	}

	return deathActivity;
}

//=========================================================
// GetSmallFlinchActivity - determines the best type of flinch
// anim to play.
//=========================================================
Activity CBaseMonster :: GetSmallFlinchActivity ( void )
{
	Activity	flinchActivity;
	BOOL		fTriedDirection;
	float		flDot;

	fTriedDirection = FALSE;
	UTIL_MakeVectors ( pev->angles );
	flDot = DotProduct ( gpGlobals->v_forward, g_vecAttackDir * -1 );
	
	switch ( m_LastHitGroup )
	{
		// pick a region-specific flinch
	case HITGROUP_HEAD:
		flinchActivity = ACT_FLINCH_HEAD;
		break;
	case HITGROUP_STOMACH:
		flinchActivity = ACT_FLINCH_STOMACH;
		break;
	case HITGROUP_LEFTARM:
		flinchActivity = ACT_FLINCH_LEFTARM;
		break;
	case HITGROUP_RIGHTARM:
		flinchActivity = ACT_FLINCH_RIGHTARM;
		break;
	case HITGROUP_LEFTLEG:
		flinchActivity = ACT_FLINCH_LEFTLEG;
		break;
	case HITGROUP_RIGHTLEG:
		flinchActivity = ACT_FLINCH_RIGHTLEG;
		break;
	case HITGROUP_GENERIC:
	default:
		// just get a generic flinch.
		flinchActivity = ACT_SMALL_FLINCH;
		break;
	}


	// do we have a sequence for the ideal activity?
	if ( LookupActivity ( flinchActivity ) == ACTIVITY_NOT_AVAILABLE )
	{
		flinchActivity = ACT_SMALL_FLINCH;
	}

	return flinchActivity;
}


BOOL CBaseMonster::ShouldGibMonster( int iGib )
{
	if ( ( iGib == GIB_NORMAL && pev->health < GIB_HEALTH_VALUE ) || ( iGib == GIB_ALWAYS ) )
		return TRUE;
	
	return FALSE;
}


void CBaseMonster::CallGibMonster( void )
{
	BOOL fade = FALSE;

	if ( HasHumanGibs() )
	{
		if ( CVAR_GET_FLOAT("violence_hgibs") == 0 )
			fade = TRUE;
	}
	else if ( HasAlienGibs() )
	{
		if ( CVAR_GET_FLOAT("violence_agibs") == 0 )
			fade = TRUE;
	}

	pev->takedamage = DAMAGE_NO;
	pev->solid = SOLID_NOT;// do something with the body. while monster blows up

	if ( fade )
	{
		FadeMonster();
	}
	else
	{
		pev->effects = EF_NODRAW; // make the model invisible.
		GibMonster();
	}

	pev->deadflag = DEAD_DEAD;
	FCheckAITrigger();

	// don't let the status bar glitch for players.with <0 health.
	if (pev->health < -99)
	{
		pev->health = 0;
	}
	
	if ( ShouldFadeOnDeath() && !fade )
		UTIL_Remove(this);
}

//
// fade out - slowly fades a entity out, then removes it.
//
// DON'T USE ME FOR GIBS AND STUFF IN MULTIPLAYER! 
// SET A FUTURE THINK AND A RENDERMODE!!
void CBaseEntity :: SUB_StartFadeOut ( void )
{
	if (pev->rendermode == kRenderNormal)
	{
		pev->renderamt = 255;
		pev->rendermode = kRenderTransTexture;
	}

	pev->solid = SOLID_NOT;
	pev->avelocity = g_vecZero;

	pev->nextthink = gpGlobals->time + 0.1;
	SetThink ( &CBaseEntity::SUB_FadeOut );
}

void CBaseEntity :: SUB_FadeOut ( void  )
{
	if ( pev->renderamt > 7 )
	{
		pev->renderamt -= 7;
		pev->nextthink = gpGlobals->time + 0.1;
	}
	else 
	{
		pev->renderamt = 0;
		pev->nextthink = gpGlobals->time + 0.2;
		SetThink ( &CBaseEntity::SUB_Remove );
	}
}

//
// Throw a chunk
//
void CGib :: Spawn( const char *szGibModel )
{
	pev->movetype = MOVETYPE_BOUNCE;
	pev->friction = 0.55; // deading the bounce a bit
	
	// sometimes an entity inherits the edict from a former piece of glass,
	// and will spawn using the same render FX or rendermode! bad!
	pev->renderamt = 255;
	pev->rendermode = kRenderNormal;
	pev->renderfx = kRenderFxNone;
	pev->solid = SOLID_SLIDEBOX;/// hopefully this will fix the VELOCITY TOO LOW crap
	pev->classname = MAKE_STRING("gib");

	SET_MODEL(ENT(pev), szGibModel);
	UTIL_SetSize(pev, Vector( 0, 0, 0), Vector(0, 0, 0));

	pev->nextthink = gpGlobals->time + 4;
	m_lifeTime = 25;
	SetThink ( &CGib::WaitTillLand );
	SetTouch ( &CGib::BounceGibTouch );

	m_material = matNone;
	m_cBloodDecals = 5;// how many blood decals this gib can place (1 per bounce until none remain). 
}

/*
============
TakeDamage

The damage is coming from inflictor, but get mad at attacker
This should be the only function that ever reduces health.
bitsDamageType indicates the type of damage sustained, ie: DMG_SHOCK

Time-based damage: only occurs while the monster is within the trigger_hurt.
When a monster is poisoned via an arrow etc it takes all the poison damage at once.



GLOBALS ASSUMED SET:  g_iSkillLevel
============
*/
int CBaseMonster :: TakeDamage( entvars_t *pevInflictor, entvars_t *pevAttacker, float flDamage, int bitsDamageType )
{
	float	flTake;
	Vector	vecDir;

	if (!pev->takedamage)
		return 0;

	if ( !IsAlive() )
	{
		return DeadTakeDamage( pevInflictor, pevAttacker, flDamage, bitsDamageType );
	}

	if ( pev->deadflag == DEAD_NO )
	{
		// no pain sound during death animation.
		PainSound();// "Ouch!"
	}

	//!!!LATER - make armor consideration here!
	flTake = flDamage;

	// set damage type sustained
	m_bitsDamageType |= bitsDamageType;

	// grab the vector of the incoming attack. ( pretend that the inflictor is a little lower than it really is, so the body will tend to fly upward a bit).
	vecDir = Vector( 0, 0, 0 );
	if (!FNullEnt( pevInflictor ))
	{
		CBaseEntity *pInflictor = CBaseEntity :: Instance( pevInflictor );
		if (pInflictor)
		{
			vecDir = ( pInflictor->Center() - Vector ( 0, 0, 10 ) - Center() ).Normalize();
			vecDir = g_vecAttackDir = vecDir.Normalize();
		}
	}

	// add to the damage total for clients, which will be sent as a single
	// message at the end of the frame
	// todo: remove after combining shotgun blasts?
	if ( IsPlayer() )
	{
		if ( pevInflictor )
			pev->dmg_inflictor = ENT(pevInflictor);

		pev->dmg_take += flTake;

		// check for godmode or invincibility
		if ( pev->flags & FL_GODMODE )
		{
			return 0;
		}
	}

	// if this is a player, move him around!
	if ( ( !FNullEnt( pevInflictor ) ) && (pev->movetype == MOVETYPE_WALK) && (!pevAttacker || pevAttacker->solid != SOLID_TRIGGER) )
	{
		pev->velocity = pev->velocity + vecDir * -DamageForce( flDamage );
	}

	// do the damage
	pev->health -= flTake;

	// HACKHACK Don't kill monsters in a script.  Let them break their scripts first
	if ( m_MonsterState == MONSTERSTATE_SCRIPT )
	{
		SetConditions( bits_COND_LIGHT_DAMAGE );
		return 0;
	}

	if ( pev->health <= 0 )
	{
		g_pevLastInflictor = pevInflictor;

		if ( bitsDamageType & DMG_ALWAYSGIB )
		{
			Killed( pevAttacker, GIB_ALWAYS );
		}
		else if ( bitsDamageType & DMG_NEVERGIB )
		{
			Killed( pevAttacker, GIB_NEVER );
		}
		else
		{
			Killed( pevAttacker, GIB_NORMAL );
		}

		g_pevLastInflictor = NULL;

		return 0;
	}

	// react to the damage (get mad)
	if ( (pev->flags & FL_MONSTER) && !FNullEnt(pevAttacker) )
	{
		if ( pevAttacker->flags & (FL_MONSTER | FL_CLIENT) )
		{// only if the attack was a monster or client!
			
			// enemy's last known position is somewhere down the vector that the attack came from.
			if (pevInflictor)
			{
				if (m_hEnemy == NULL || pevInflictor == m_hEnemy->pev || !HasConditions(bits_COND_SEE_ENEMY))
				{
					m_vecEnemyLKP = pevInflictor->origin;
				}
			}
			else
			{
				m_vecEnemyLKP = pev->origin + ( g_vecAttackDir * 64 ); 
			}

			MakeIdealYaw( m_vecEnemyLKP );

			// add pain to the conditions 
			// !!!HACKHACK - fudged for now. Do we want to have a virtual function to determine what is light and 
			// heavy damage per monster class?
			if ( flDamage > 0 )
			{
				SetConditions(bits_COND_LIGHT_DAMAGE);
			}

			if ( flDamage >= 20 )
			{
				SetConditions(bits_COND_HEAVY_DAMAGE);
			}
		}
	}

	return 1;
}

//=========================================================
// DeadTakeDamage - takedamage function called when a monster's
// corpse is damaged.
//=========================================================
int CBaseMonster :: DeadTakeDamage( entvars_t *pevInflictor, entvars_t *pevAttacker, float flDamage, int bitsDamageType )
{
	Vector			vecDir;

	// grab the vector of the incoming attack. ( pretend that the inflictor is a little lower than it really is, so the body will tend to fly upward a bit).
	vecDir = Vector( 0, 0, 0 );
	if (!FNullEnt( pevInflictor ))
	{
		CBaseEntity *pInflictor = CBaseEntity :: Instance( pevInflictor );
		if (pInflictor)
		{
			vecDir = ( pInflictor->Center() - Vector ( 0, 0, 10 ) - Center() ).Normalize();
			vecDir = g_vecAttackDir = vecDir.Normalize();
		}
	}

#if 0// turn this back on when the bounding box issues are resolved.

	pev->flags &= ~FL_ONGROUND;
	pev->origin.z += 1;
	
	// let the damage scoot the corpse around a bit.
	if ( !FNullEnt(pevInflictor) && (pevAttacker->solid != SOLID_TRIGGER) )
	{
		pev->velocity = pev->velocity + vecDir * -DamageForce( flDamage );
	}

#endif

	// kill the corpse if enough damage was done to destroy the corpse and the damage is of a type that is allowed to destroy the corpse.
	if ( bitsDamageType & DMG_GIB_CORPSE )
	{
		if ( pev->health <= flDamage )
		{
			pev->health = -50;
			Killed( pevAttacker, GIB_ALWAYS );
			return 0;
		}
		// Accumulate corpse gibbing damage, so you can gib with multiple hits
		pev->health -= flDamage * 0.1;
	}
	
	return 1;
}


float CBaseMonster :: DamageForce( float damage )
{ 
	float force = damage * ((32 * 32 * 72.0) / (pev->size.x * pev->size.y * pev->size.z)) * 5;
	
	if ( force > 1000.0) 
	{
		force = 1000.0;
	}

	return force;
}

//
// RadiusDamage - this entity is exploding, or otherwise needs to inflict damage upon entities within a certain range.
// 
// only damage ents that can clearly be seen by the explosion!

	
void RadiusDamage( Vector vecSrc, entvars_t *pevInflictor, entvars_t *pevAttacker, float flDamage, float flRadius, int iClassIgnore, int bitsDamageType )
{
	CBaseEntity *pEntity = NULL;
	TraceResult	tr;
	float		flAdjustedDamage, falloff;
	Vector		vecSpot;

	if ( flRadius )
		falloff = flDamage / flRadius;
	else
		falloff = 1.0;

	int bInWater = (UTIL_PointContents ( vecSrc ) == CONTENTS_WATER);

	vecSrc.z += 1;// in case grenade is lying on the ground

	if ( !pevAttacker )
		pevAttacker = pevInflictor;

	// iterate on all entities in the vicinity.
	while ((pEntity = UTIL_FindEntityInSphere( pEntity, vecSrc, flRadius )) != NULL)
	{
		if ( pEntity->pev->takedamage != DAMAGE_NO )
		{
			// UNDONE: this should check a damage mask, not an ignore
			if ( iClassIgnore != CLASS_NONE && pEntity->Classify() == iClassIgnore )
			{// houndeyes don't hurt other houndeyes with their attack
				continue;
			}

			// blast's don't tavel into or out of water
			if (bInWater && pEntity->pev->waterlevel == 0)
				continue;
			if (!bInWater && pEntity->pev->waterlevel == 3)
				continue;

			vecSpot = pEntity->BodyTarget( vecSrc );
			
			UTIL_TraceLine ( vecSrc, vecSpot, dont_ignore_monsters, ENT(pevInflictor), &tr );

			if ( tr.flFraction == 1.0 || tr.pHit == pEntity->edict() )
			{// the explosion can 'see' this entity, so hurt them!
				if (tr.fStartSolid)
				{
					// if we're stuck inside them, fixup the position and distance
					tr.vecEndPos = vecSrc;
					tr.flFraction = 0.0;
				}
				
				// decrease damage for an ent that's farther from the bomb.
				flAdjustedDamage = ( vecSrc - tr.vecEndPos ).Length() * falloff;
				flAdjustedDamage = flDamage - flAdjustedDamage;
			
				if ( flAdjustedDamage < 0 )
				{
					flAdjustedDamage = 0;
				}
			
				// ALERT( at_console, "hit %s\n", STRING( pEntity->pev->classname ) );
				if (tr.flFraction != 1.0)
				{
					ClearMultiDamage( );
					pEntity->TraceAttack( pevInflictor, flAdjustedDamage, (tr.vecEndPos - vecSrc).Normalize( ), &tr, bitsDamageType );
					ApplyMultiDamage( pevInflictor, pevAttacker );
				}
				else
				{
					pEntity->TakeDamage ( pevInflictor, pevAttacker, flAdjustedDamage, bitsDamageType );
				}
			}
		}
	}
}


void CBaseMonster :: RadiusDamage(entvars_t* pevInflictor, entvars_t*	pevAttacker, float flDamage, int iClassIgnore, int bitsDamageType )
{
	::RadiusDamage( pev->origin, pevInflictor, pevAttacker, flDamage, flDamage * 2.5, iClassIgnore, bitsDamageType );
}


void CBaseMonster :: RadiusDamage( Vector vecSrc, entvars_t *pevInflictor, entvars_t *pevAttacker, float flDamage, int iClassIgnore, int bitsDamageType )
{
	::RadiusDamage( vecSrc, pevInflictor, pevAttacker, flDamage, flDamage * 2.5, iClassIgnore, bitsDamageType );
}

/*
//=========================================================
// TraceAttack
//=========================================================
void CBaseMonster::TraceAttack(entvars_t *pevAttacker, float flDamage, Vector vecDir, TraceResult *ptr, int bitsDamageType)
{
	Vector vecOrigin = ptr->vecEndPos - vecDir * 4;

	ALERT ( at_console, "%d\n", ptr->iHitgroup );


	if ( pev->takedamage )
	{
		AddMultiDamage( pevAttacker, this, flDamage, bitsDamageType );

		int blood = BloodColor();
		
		if ( blood != DONT_BLEED )
		{
			SpawnBlood(vecOrigin, blood, flDamage);// a little surface blood.
		}
	}
}
*/

void CBaseEntity :: TraceBleed( float flDamage, Vector vecDir, TraceResult *ptr, int bitsDamageType )
{
	if (BloodColor() == DONT_BLEED)
		return;
	
	if (flDamage == 0)
		return;

	if (! (bitsDamageType & (DMG_CRUSH | DMG_BULLET | DMG_SLASH | DMG_BLAST | DMG_CLUB | DMG_MORTAR)))
		return;
	
	// make blood decal on the wall! 
	TraceResult Bloodtr;
	Vector vecTraceDir; 
	float flNoise;
	int cCount;
	int i;

	if (flDamage < 10)
	{
		flNoise = 0.1;
		cCount = 1;
	}
	else if (flDamage < 25)
	{
		flNoise = 0.2;
		cCount = 2;
	}
	else
	{
		flNoise = 0.3;
		cCount = 4;
	}

	for ( i = 0 ; i < cCount ; i++ )
	{
		vecTraceDir = vecDir * -1;// trace in the opposite direction the shot came from (the direction the shot is going)

		vecTraceDir.x += RANDOM_FLOAT( -flNoise, flNoise );
		vecTraceDir.y += RANDOM_FLOAT( -flNoise, flNoise );
		vecTraceDir.z += RANDOM_FLOAT( -flNoise, flNoise );

		UTIL_TraceLine( ptr->vecEndPos, ptr->vecEndPos + vecTraceDir * -172, ignore_monsters, ENT(pev), &Bloodtr);

		if ( Bloodtr.flFraction != 1.0 )
		{
			UTIL_BloodDecalTrace( &Bloodtr, BloodColor() );
		}
	}
}

//=========================================================
//=========================================================
void CBaseMonster :: MakeDamageBloodDecal ( int cCount, float flNoise, TraceResult *ptr, const Vector &vecDir )
{
	// make blood decal on the wall! 
	TraceResult Bloodtr;
	Vector vecTraceDir; 
	int i;

	if ( !IsAlive() )
	{
		// dealing with a dead monster. 
		if ( pev->max_health <= 0 )
		{
			// no blood decal for a monster that has already decalled its limit.
			return; 
		}
		else
		{
			pev->max_health--;
		}
	}

	for ( i = 0 ; i < cCount ; i++ )
	{
		vecTraceDir = vecDir;

		vecTraceDir.x += RANDOM_FLOAT( -flNoise, flNoise );
		vecTraceDir.y += RANDOM_FLOAT( -flNoise, flNoise );
		vecTraceDir.z += RANDOM_FLOAT( -flNoise, flNoise );

		UTIL_TraceLine( ptr->vecEndPos, ptr->vecEndPos + vecTraceDir * 172, ignore_monsters, ENT(pev), &Bloodtr);

/*
		MESSAGE_BEGIN( MSG_BROADCAST, SVC_TEMPENTITY );
			WRITE_BYTE( TE_SHOWLINE);
			WRITE_COORD( ptr->vecEndPos.x );
			WRITE_COORD( ptr->vecEndPos.y );
			WRITE_COORD( ptr->vecEndPos.z );
			
			WRITE_COORD( Bloodtr.vecEndPos.x );
			WRITE_COORD( Bloodtr.vecEndPos.y );
			WRITE_COORD( Bloodtr.vecEndPos.z );
		MESSAGE_END();
*/

		if ( Bloodtr.flFraction != 1.0 )
		{
			UTIL_BloodDecalTrace( &Bloodtr, BloodColor() );
		}
	}
}