g_combat.c

quakeIII源码这个不用我多说吧

T_Damage

targ		entity that is being damaged
inflictor	entity that is causing the damage
attacker	entity that caused the inflictor to damage targ
	example: targ=monster, inflictor=rocket, attacker=player

dir			direction of the attack for knockback
point		point at which the damage is being inflicted, used for headshots
damage		amount of damage being inflicted
knockback	force to be applied against targ as a result of the damage

inflictor, attacker, dir, and point can be NULL for environmental effects

dflags		these flags are used to control how T_Damage works
	DAMAGE_RADIUS			damage was indirect (from a nearby explosion)
	DAMAGE_NO_ARMOR			armor does not protect from this damage
	DAMAGE_NO_KNOCKBACK		do not affect velocity, just view angles
	DAMAGE_NO_PROTECTION	kills godmode, armor, everything
============
*/

void G_Damage( gentity_t *targ, gentity_t *inflictor, gentity_t *attacker,
			   vec3_t dir, vec3_t point, int damage, int dflags, int mod ) {
	gclient_t	*client;
	int			take;
	int			save;
	int			asave;
	int			knockback;
	int			max;
#ifdef MISSIONPACK
	vec3_t		bouncedir, impactpoint;
#endif

	if (!targ->takedamage) {
		return;
	}

	// the intermission has allready been qualified for, so don't
	// allow any extra scoring
	if ( level.intermissionQueued ) {
		return;
	}
#ifdef MISSIONPACK
	if ( targ->client && mod != MOD_JUICED) {
		if ( targ->client->invulnerabilityTime > level.time) {
			if ( dir && point ) {
				G_InvulnerabilityEffect( targ, dir, point, impactpoint, bouncedir );
			}
			return;
		}
	}
#endif
	if ( !inflictor ) {
		inflictor = &g_entities[ENTITYNUM_WORLD];
	}
	if ( !attacker ) {
		attacker = &g_entities[ENTITYNUM_WORLD];
	}

	// shootable doors / buttons don't actually have any health
	if ( targ->s.eType == ET_MOVER ) {
		if ( targ->use && targ->moverState == MOVER_POS1 ) {
			targ->use( targ, inflictor, attacker );
		}
		return;
	}
#ifdef MISSIONPACK
	if( g_gametype.integer == GT_OBELISK && CheckObeliskAttack( targ, attacker ) ) {
		return;
	}
#endif
	// reduce damage by the attacker's handicap value
	// unless they are rocket jumping
	if ( attacker->client && attacker != targ ) {
		max = attacker->client->ps.stats[STAT_MAX_HEALTH];
#ifdef MISSIONPACK
		if( bg_itemlist[attacker->client->ps.stats[STAT_PERSISTANT_POWERUP]].giTag == PW_GUARD ) {
			max /= 2;
		}
#endif
		damage = damage * max / 100;
	}

	client = targ->client;

	if ( client ) {
		if ( client->noclip ) {
			return;
		}
	}

	if ( !dir ) {
		dflags |= DAMAGE_NO_KNOCKBACK;
	} else {
		VectorNormalize(dir);
	}

	knockback = damage;
	if ( knockback > 200 ) {
		knockback = 200;
	}
	if ( targ->flags & FL_NO_KNOCKBACK ) {
		knockback = 0;
	}
	if ( dflags & DAMAGE_NO_KNOCKBACK ) {
		knockback = 0;
	}

	// figure momentum add, even if the damage won't be taken
	if ( knockback && targ->client ) {
		vec3_t	kvel;
		float	mass;

		mass = 200;

		VectorScale (dir, g_knockback.value * (float)knockback / mass, kvel);
		VectorAdd (targ->client->ps.velocity, kvel, targ->client->ps.velocity);

		// set the timer so that the other client can't cancel
		// out the movement immediately
		if ( !targ->client->ps.pm_time ) {
			int		t;

			t = knockback * 2;
			if ( t < 50 ) {
				t = 50;
			}
			if ( t > 200 ) {
				t = 200;
			}
			targ->client->ps.pm_time = t;
			targ->client->ps.pm_flags |= PMF_TIME_KNOCKBACK;
		}
	}

	// check for completely getting out of the damage
	if ( !(dflags & DAMAGE_NO_PROTECTION) ) {

		// if TF_NO_FRIENDLY_FIRE is set, don't do damage to the target
		// if the attacker was on the same team
#ifdef MISSIONPACK
		if ( mod != MOD_JUICED && targ != attacker && !(dflags & DAMAGE_NO_TEAM_PROTECTION) && OnSameTeam (targ, attacker)  ) {
#else	
		if ( targ != attacker && OnSameTeam (targ, attacker)  ) {
#endif
			if ( !g_friendlyFire.integer ) {
				return;
			}
		}
#ifdef MISSIONPACK
		if (mod == MOD_PROXIMITY_MINE) {
			if (inflictor && inflictor->parent && OnSameTeam(targ, inflictor->parent)) {
				return;
			}
			if (targ == attacker) {
				return;
			}
		}
#endif

		// check for godmode
		if ( targ->flags & FL_GODMODE ) {
			return;
		}
	}

	// battlesuit protects from all radius damage (but takes knockback)
	// and protects 50% against all damage
	if ( client && client->ps.powerups[PW_BATTLESUIT] ) {
		G_AddEvent( targ, EV_POWERUP_BATTLESUIT, 0 );
		if ( ( dflags & DAMAGE_RADIUS ) || ( mod == MOD_FALLING ) ) {
			return;
		}
		damage *= 0.5;
	}

	// add to the attacker's hit counter (if the target isn't a general entity like a prox mine)
	if ( attacker->client && targ != attacker && targ->health > 0
			&& targ->s.eType != ET_MISSILE
			&& targ->s.eType != ET_GENERAL) {
		if ( OnSameTeam( targ, attacker ) ) {
			attacker->client->ps.persistant[PERS_HITS]--;
		} else {
			attacker->client->ps.persistant[PERS_HITS]++;
		}
		attacker->client->ps.persistant[PERS_ATTACKEE_ARMOR] = (targ->health<<8)|(client->ps.stats[STAT_ARMOR]);
	}

	// always give half damage if hurting self
	// calculated after knockback, so rocket jumping works
	if ( targ == attacker) {
		damage *= 0.5;
	}

	if ( damage < 1 ) {
		damage = 1;
	}
	take = damage;
	save = 0;

	// save some from armor
	asave = CheckArmor (targ, take, dflags);
	take -= asave;

	if ( g_debugDamage.integer ) {
		G_Printf( "%i: client:%i health:%i damage:%i armor:%i\n", level.time, targ->s.number,
			targ->health, take, asave );
	}

	// add to the damage inflicted on a player this frame
	// the total will be turned into screen blends and view angle kicks
	// at the end of the frame
	if ( client ) {
		if ( attacker ) {
			client->ps.persistant[PERS_ATTACKER] = attacker->s.number;
		} else {
			client->ps.persistant[PERS_ATTACKER] = ENTITYNUM_WORLD;
		}
		client->damage_armor += asave;
		client->damage_blood += take;
		client->damage_knockback += knockback;
		if ( dir ) {
			VectorCopy ( dir, client->damage_from );
			client->damage_fromWorld = qfalse;
		} else {
			VectorCopy ( targ->r.currentOrigin, client->damage_from );
			client->damage_fromWorld = qtrue;
		}
	}

	// See if it's the player hurting the emeny flag carrier
#ifdef MISSIONPACK
	if( g_gametype.integer == GT_CTF || g_gametype.integer == GT_1FCTF ) {
#else	
	if( g_gametype.integer == GT_CTF) {
#endif
		Team_CheckHurtCarrier(targ, attacker);
	}

	if (targ->client) {
		// set the last client who damaged the target
		targ->client->lasthurt_client = attacker->s.number;
		targ->client->lasthurt_mod = mod;
	}

	// do the damage
	if (take) {
		targ->health = targ->health - take;
		if ( targ->client ) {
			targ->client->ps.stats[STAT_HEALTH] = targ->health;
		}
			
		if ( targ->health <= 0 ) {
			if ( client )
				targ->flags |= FL_NO_KNOCKBACK;

			if (targ->health < -999)
				targ->health = -999;

			targ->enemy = attacker;
			targ->die (targ, inflictor, attacker, take, mod);
			return;
		} else if ( targ->pain ) {
			targ->pain (targ, attacker, take);
		}
	}

}


/*
============
CanDamage

Returns qtrue if the inflictor can directly damage the target.  Used for
explosions and melee attacks.
============
*/
qboolean CanDamage (gentity_t *targ, vec3_t origin) {
	vec3_t	dest;
	trace_t	tr;
	vec3_t	midpoint;

	// use the midpoint of the bounds instead of the origin, because
	// bmodels may have their origin is 0,0,0
	VectorAdd (targ->r.absmin, targ->r.absmax, midpoint);
	VectorScale (midpoint, 0.5, midpoint);

	VectorCopy (midpoint, dest);
	trap_Trace ( &tr, origin, vec3_origin, vec3_origin, dest, ENTITYNUM_NONE, MASK_SOLID);
	if (tr.fraction == 1.0 || tr.entityNum == targ->s.number)
		return qtrue;

	// this should probably check in the plane of projection, 
	// rather than in world coordinate, and also include Z
	VectorCopy (midpoint, dest);
	dest[0] += 15.0;
	dest[1] += 15.0;
	trap_Trace ( &tr, origin, vec3_origin, vec3_origin, dest, ENTITYNUM_NONE, MASK_SOLID);
	if (tr.fraction == 1.0)
		return qtrue;

	VectorCopy (midpoint, dest);
	dest[0] += 15.0;
	dest[1] -= 15.0;
	trap_Trace ( &tr, origin, vec3_origin, vec3_origin, dest, ENTITYNUM_NONE, MASK_SOLID);
	if (tr.fraction == 1.0)
		return qtrue;

	VectorCopy (midpoint, dest);
	dest[0] -= 15.0;
	dest[1] += 15.0;
	trap_Trace ( &tr, origin, vec3_origin, vec3_origin, dest, ENTITYNUM_NONE, MASK_SOLID);
	if (tr.fraction == 1.0)
		return qtrue;

	VectorCopy (midpoint, dest);
	dest[0] -= 15.0;
	dest[1] -= 15.0;
	trap_Trace ( &tr, origin, vec3_origin, vec3_origin, dest, ENTITYNUM_NONE, MASK_SOLID);
	if (tr.fraction == 1.0)
		return qtrue;


	return qfalse;
}


/*
============
G_RadiusDamage
============
*/
qboolean G_RadiusDamage ( vec3_t origin, gentity_t *attacker, float damage, float radius,
					 gentity_t *ignore, int mod) {
	float		points, dist;
	gentity_t	*ent;
	int			entityList[MAX_GENTITIES];
	int			numListedEntities;
	vec3_t		mins, maxs;
	vec3_t		v;
	vec3_t		dir;
	int			i, e;
	qboolean	hitClient = qfalse;

	if ( radius < 1 ) {
		radius = 1;
	}

	for ( i = 0 ; i < 3 ; i++ ) {
		mins[i] = origin[i] - radius;
		maxs[i] = origin[i] + radius;
	}

	numListedEntities = trap_EntitiesInBox( mins, maxs, entityList, MAX_GENTITIES );

	for ( e = 0 ; e < numListedEntities ; e++ ) {
		ent = &g_entities[entityList[ e ]];

		if (ent == ignore)
			continue;
		if (!ent->takedamage)
			continue;

		// find the distance from the edge of the bounding box
		for ( i = 0 ; i < 3 ; i++ ) {
			if ( origin[i] < ent->r.absmin[i] ) {
				v[i] = ent->r.absmin[i] - origin[i];
			} else if ( origin[i] > ent->r.absmax[i] ) {
				v[i] = origin[i] - ent->r.absmax[i];
			} else {
				v[i] = 0;
			}
		}

		dist = VectorLength( v );
		if ( dist >= radius ) {
			continue;
		}

		points = damage * ( 1.0 - dist / radius );

		if( CanDamage (ent, origin) ) {
			if( LogAccuracyHit( ent, attacker ) ) {
				hitClient = qtrue;
			}
			VectorSubtract (ent->r.currentOrigin, origin, dir);
			// push the center of mass higher than the origin so players
			// get knocked into the air more
			dir[2] += 24;
			G_Damage (ent, NULL, attacker, dir, origin, (int)points, DAMAGE_RADIUS, mod);
		}
	}

	return hitClient;
}