Exemplo n.º 1
0
void CGameRules::RadiusDamage( const CTakeDamageInfo &info, const Vector &vecSrcIn, float flRadius, int iClassIgnore, CBaseEntity *pEntityIgnore )
{
	const int MASK_RADIUS_DAMAGE = MASK_SHOT&(~CONTENTS_HITBOX);
	CBaseEntity *pEntity = NULL;
	trace_t		tr;
	float		flAdjustedDamage, falloff;
	Vector		vecSpot;

	Vector vecSrc = vecSrcIn;

	if ( flRadius )
		falloff = info.GetDamage() / flRadius;
	else
		falloff = 1.0;

	int bInWater = (UTIL_PointContents ( vecSrc ) & MASK_WATER) ? true : false;

#ifdef HL2_DLL
	if( bInWater )
	{
		// Only muffle the explosion if deeper than 2 feet in water.
		if( !(UTIL_PointContents(vecSrc + Vector(0, 0, 24)) & MASK_WATER) )
		{
			bInWater = false;
		}
	}
#endif // HL2_DLL
	
	vecSrc.z += 1;// in case grenade is lying on the ground

	float flHalfRadiusSqr = Square( flRadius / 2.0f );

	// iterate on all entities in the vicinity.
	for ( CEntitySphereQuery sphere( vecSrc, flRadius ); (pEntity = sphere.GetCurrentEntity()) != NULL; sphere.NextEntity() )
	{
		// This value is used to scale damage when the explosion is blocked by some other object.
		float flBlockedDamagePercent = 0.0f;

		if ( pEntity == pEntityIgnore )
			continue;

		if ( pEntity->m_takedamage == DAMAGE_NO )
			continue;

		// 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->GetWaterLevel() == 0)
			continue;

		if (!bInWater && pEntity->GetWaterLevel() == 3)
			continue;

		// Check that the explosion can 'see' this entity.
		vecSpot = pEntity->BodyTarget( vecSrc, false );
		UTIL_TraceLine( vecSrc, vecSpot, MASK_RADIUS_DAMAGE, info.GetInflictor(), COLLISION_GROUP_NONE, &tr );

		if( old_radius_damage.GetBool() )
		{
			if ( tr.fraction != 1.0 && tr.m_pEnt != pEntity )
			continue;
		}
		else
		{
			if ( tr.fraction != 1.0 )
			{
				if ( IsExplosionTraceBlocked(&tr) )
				{
					if( ShouldUseRobustRadiusDamage( pEntity ) )
					{
						if( vecSpot.DistToSqr( vecSrc ) > flHalfRadiusSqr )
						{
							// Only use robust model on a target within one-half of the explosion's radius.
							continue;
						}

						Vector vecToTarget = vecSpot - tr.endpos;
						VectorNormalize( vecToTarget );

						// We're going to deflect the blast along the surface that 
						// interrupted a trace from explosion to this target.
						Vector vecUp, vecDeflect;
						CrossProduct( vecToTarget, tr.plane.normal, vecUp );
						CrossProduct( tr.plane.normal, vecUp, vecDeflect );
						VectorNormalize( vecDeflect );

						// Trace along the surface that intercepted the blast...
						UTIL_TraceLine( tr.endpos, tr.endpos + vecDeflect * ROBUST_RADIUS_PROBE_DIST, MASK_RADIUS_DAMAGE, info.GetInflictor(), COLLISION_GROUP_NONE, &tr );
						//NDebugOverlay::Line( tr.startpos, tr.endpos, 255, 255, 0, false, 10 );

						// ...to see if there's a nearby edge that the explosion would 'spill over' if the blast were fully simulated.
						UTIL_TraceLine( tr.endpos, vecSpot, MASK_RADIUS_DAMAGE, info.GetInflictor(), COLLISION_GROUP_NONE, &tr );
						//NDebugOverlay::Line( tr.startpos, tr.endpos, 255, 0, 0, false, 10 );

						if( tr.fraction != 1.0 && tr.DidHitWorld() )
						{
							// Still can't reach the target.
							continue;
						}
						// else fall through
					}
					else
					{
						continue;
					}
				}

				// UNDONE: Probably shouldn't let children block parents either?  Or maybe those guys should set their owner if they want this behavior?
				// HL2 - Dissolve damage is not reduced by interposing non-world objects
				if( tr.m_pEnt && tr.m_pEnt != pEntity && tr.m_pEnt->GetOwnerEntity() != pEntity )
				{
					// Some entity was hit by the trace, meaning the explosion does not have clear
					// line of sight to the entity that it's trying to hurt. If the world is also
					// blocking, we do no damage.
					CBaseEntity *pBlockingEntity = tr.m_pEnt;
					//Msg( "%s may be blocked by %s...", pEntity->GetClassname(), pBlockingEntity->GetClassname() );

					UTIL_TraceLine( vecSrc, vecSpot, CONTENTS_SOLID, info.GetInflictor(), COLLISION_GROUP_NONE, &tr );

					if( tr.fraction != 1.0 )
					{
						continue;
					}
					
					// Now, if the interposing object is physics, block some explosion force based on its mass.
					if( pBlockingEntity->VPhysicsGetObject() )
					{
						const float MASS_ABSORB_ALL_DAMAGE = 350.0f;
						float flMass = pBlockingEntity->VPhysicsGetObject()->GetMass();
						float scale = flMass / MASS_ABSORB_ALL_DAMAGE;

						// Absorbed all the damage.
						if( scale >= 1.0f )
						{
							continue;
						}

						ASSERT( scale > 0.0f );
						flBlockedDamagePercent = scale;
						//Msg("  Object (%s) weighing %fkg blocked %f percent of explosion damage\n", pBlockingEntity->GetClassname(), flMass, scale * 100.0f);
					}
					else
					{
						// Some object that's not the world and not physics. Generically block 25% damage
						flBlockedDamagePercent = 0.25f;
					}
				}
			}
		}
		// decrease damage for an ent that's farther from the bomb.
		flAdjustedDamage = ( vecSrc - tr.endpos ).Length() * falloff;
		flAdjustedDamage = info.GetDamage() - flAdjustedDamage;

		if ( flAdjustedDamage <= 0 )
		{
			continue;
		}

		// the explosion can 'see' this entity, so hurt them!
		if (tr.startsolid)
		{
			// if we're stuck inside them, fixup the position and distance
			tr.endpos = vecSrc;
			tr.fraction = 0.0;
		}
		
		CTakeDamageInfo adjustedInfo = info;
		//Msg("%s: Blocked damage: %f percent (in:%f  out:%f)\n", pEntity->GetClassname(), flBlockedDamagePercent * 100, flAdjustedDamage, flAdjustedDamage - (flAdjustedDamage * flBlockedDamagePercent) );
		adjustedInfo.SetDamage( flAdjustedDamage - (flAdjustedDamage * flBlockedDamagePercent) );

		// Now make a consideration for skill level!
		if( info.GetAttacker() && info.GetAttacker()->IsPlayer() && pEntity->IsNPC() )
		{
			// An explosion set off by the player is harming an NPC. Adjust damage accordingly.
			adjustedInfo.AdjustPlayerDamageInflictedForSkillLevel();
		}

		Vector dir = vecSpot - vecSrc;
		VectorNormalize( dir );

		// If we don't have a damage force, manufacture one
		if ( adjustedInfo.GetDamagePosition() == vec3_origin || adjustedInfo.GetDamageForce() == vec3_origin )
		{
			if ( !( adjustedInfo.GetDamageType() & DMG_PREVENT_PHYSICS_FORCE ) )
			{
				CalculateExplosiveDamageForce( &adjustedInfo, dir, vecSrc );
			}
		}
		else
		{
			// Assume the force passed in is the maximum force. Decay it based on falloff.
			float flForce = adjustedInfo.GetDamageForce().Length() * falloff;
			adjustedInfo.SetDamageForce( dir * flForce );
			adjustedInfo.SetDamagePosition( vecSrc );
		}

		if ( tr.fraction != 1.0 && pEntity == tr.m_pEnt )
		{
			ClearMultiDamage( );
			pEntity->DispatchTraceAttack( adjustedInfo, dir, &tr );
			ApplyMultiDamage();
		}
		else
		{
			pEntity->TakeDamage( adjustedInfo );
		}

		// Now hit all triggers along the way that respond to damage... 
		pEntity->TraceAttackToTriggers( adjustedInfo, vecSrc, tr.endpos, dir );

#if defined( GAME_DLL )
		if ( info.GetAttacker() && info.GetAttacker()->IsPlayer() && ToBaseCombatCharacter( tr.m_pEnt ) )
		{

			// This is a total hack!!!
			bool bIsPrimary = true;
			CBasePlayer *player = ToBasePlayer( info.GetAttacker() );
			CBaseCombatWeapon *pWeapon = player->GetActiveWeapon();
			if ( pWeapon && FClassnameIs( pWeapon, "weapon_smg1" ) )
			{
				bIsPrimary = false;
			}

			//gamestats->Event_WeaponHit( player, bIsPrimary, (pWeapon != NULL) ? player->GetActiveWeapon()->GetClassname() : "NULL", info );
		}
#endif
	}
}