/*

Copyright (C) 1997-2001 Id Software, Inc.

This program is free software; you can redistribute it and/or

modify it under the terms of the GNU General Public License

as published by the Free Software Foundation; either version 2

of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

*/

// g_combat.c

#include "g_local.h"

/*

============

CanDamage

Returns true if the inflictor can directly damage the target. Used for

explosions and melee attacks.

============

*/

qboolean CanDamage(edict_t * targ, edict_t * inflictor)

{

vec3_t dest;

trace_t trace;

// bmodels need special checking because their origin is 0,0,0

if (targ->movetype == MOVETYPE_PUSH) {

VectorAdd(targ->absmin, targ->absmax, dest);

VectorScale(dest, 0.5, dest);

trace =

gi.trace(inflictor->s.origin, vec3_origin, vec3_origin,

dest, inflictor, MASK_SOLID);

if (trace.fraction == 1.0)

return true;

if (trace.ent == targ)

return true;

return false;

}

trace =

gi.trace(inflictor->s.origin, vec3_origin, vec3_origin,

targ->s.origin, inflictor, MASK_SOLID);

if (trace.fraction == 1.0)

return true;

VectorCopy(targ->s.origin, dest);

dest[0] += 15.0;

dest[1] += 15.0;

trace =

gi.trace(inflictor->s.origin, vec3_origin, vec3_origin, dest,

inflictor, MASK_SOLID);

if (trace.fraction == 1.0)

return true;

VectorCopy(targ->s.origin, dest);

dest[0] += 15.0;

dest[1] -= 15.0;

trace =

gi.trace(inflictor->s.origin, vec3_origin, vec3_origin, dest,

inflictor, MASK_SOLID);

if (trace.fraction == 1.0)

return true;

VectorCopy(targ->s.origin, dest);

dest[0] -= 15.0;

dest[1] += 15.0;

trace =

gi.trace(inflictor->s.origin, vec3_origin, vec3_origin, dest,

inflictor, MASK_SOLID);

if (trace.fraction == 1.0)

return true;

VectorCopy(targ->s.origin, dest);

dest[0] -= 15.0;

dest[1] -= 15.0;

trace =

gi.trace(inflictor->s.origin, vec3_origin, vec3_origin, dest,

inflictor, MASK_SOLID);

if (trace.fraction == 1.0)

return true;

return false;

}

/*

============

Killed

============

*/

void Killed(edict_t * targ, edict_t * inflictor, edict_t * attacker, int damage,

vec3_t point)

{

if (targ->health < -999)

targ->health = -999;

targ->enemy = attacker;

if ((targ->svflags & SVF_MONSTER) && (targ->deadflag != DEAD_DEAD)) {

// targ->svflags |= SVF_DEADMONSTER; // now treat as a different content type

if (!(targ->monsterinfo.aiflags & AI_GOOD_GUY)) {

level.killed_monsters++;

if (coop->value && attacker->client)

attacker->client->resp.score++;

// medics won't heal monsters that they kill themselves

if (strcmp(attacker->classname, "monster_medic") == 0)

targ->owner = attacker;

}

}

if (targ->movetype == MOVETYPE_PUSH || targ->movetype == MOVETYPE_STOP || targ->movetype == MOVETYPE_NONE) { // doors, triggers, etc

targ->die(targ, inflictor, attacker, damage, point);

return;

}

if ((targ->svflags & SVF_MONSTER) && (targ->deadflag != DEAD_DEAD)) {

targ->touch = NULL;

monster_death_use(targ);

}

targ->die(targ, inflictor, attacker, damage, point);

}

/*

================

SpawnDamage

================

*/

void SpawnDamage(int type, vec3_t origin, vec3_t normal, int damage)

{

if (damage > 255)

damage = 255;

gi.WriteByte(svc_temp_entity);

gi.WriteByte(type);

// gi.WriteByte (damage);

gi.WritePosition(origin);

gi.WriteDir(normal);

gi.multicast(origin, MULTICAST_PVS);

}

/*

============

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

point point at which the damage is being inflicted

normal normal vector from that point

damage amount of damage being inflicted

knockback force to be applied against targ as a result of the damage

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_ENERGY damage is from an energy based weapon

DAMAGE_NO_KNOCKBACK do not affect velocity, just view angles

DAMAGE_BULLET damage is from a bullet (used for ricochets)

DAMAGE_NO_PROTECTION kills godmode, armor, everything

============

*/

static int CheckPowerArmor(edict_t * ent, vec3_t point, vec3_t normal,

int damage, int dflags)

{

gclient_t *client;

int save;

int power_armor_type;

int index;

int damagePerCell;

int pa_te_type;

int power;

int power_used;

if (!damage)

return 0;

client = ent->client;

if (dflags & DAMAGE_NO_ARMOR)

return 0;

if (client) {

power_armor_type = PowerArmorType(ent);

if (power_armor_type != POWER_ARMOR_NONE) {

index = ITEM_INDEX(FindItem("Cells"));

power = client->pers.inventory[index];

}

} else if (ent->svflags & SVF_MONSTER) {

power_armor_type = ent->monsterinfo.power_armor_type;

power = ent->monsterinfo.power_armor_power;

index = 0;

} else

return 0;

if (power_armor_type == POWER_ARMOR_NONE)

return 0;

if (!power)

return 0;

if (power_armor_type == POWER_ARMOR_SCREEN) {

vec3_t vec;

float dot;

vec3_t forward;

// only works if damage point is in front

AngleVectors(ent->s.angles, forward, NULL, NULL);

VectorSubtract(point, ent->s.origin, vec);

VectorNormalize(vec);

dot = DotProduct(vec, forward);

if (dot <= 0.3)

return 0;

damagePerCell = 1;

pa_te_type = TE_SCREEN_SPARKS;

damage = damage / 3;

} else {

damagePerCell = 2;

pa_te_type = TE_SHIELD_SPARKS;

damage = (2 * damage) / 3;

}

save = power * damagePerCell;

if (!save)

return 0;

if (save > damage)

save = damage;

SpawnDamage(pa_te_type, point, normal, save);

ent->powerarmor_time = level.time + 0.2;

power_used = save / damagePerCell;

if (client)

client->pers.inventory[index] -= power_used;

else

ent->monsterinfo.power_armor_power -= power_used;

return save;

}

static int CheckArmor(edict_t * ent, vec3_t point, vec3_t normal, int damage,

int te_sparks, int dflags)

{

gclient_t *client;

int save;

int index;

gitem_t *armor;

if (!damage)

return 0;

client = ent->client;

if (!client)

return 0;

if (dflags & DAMAGE_NO_ARMOR)

return 0;

index = ArmorIndex(ent);

if (!index)

return 0;

armor = GetItemByIndex(index);

if (dflags & DAMAGE_ENERGY)

save =

ceil(((gitem_armor_t *) armor->info)->energy_protection *

damage);

else

save =

ceil(((gitem_armor_t *) armor->info)->normal_protection *

damage);

if (save >= client->pers.inventory[index])

save = client->pers.inventory[index];

if (!save)

return 0;

client->pers.inventory[index] -= save;

SpawnDamage(te_sparks, point, normal, save);

return save;

}

void M_ReactToDamage(edict_t * targ, edict_t * attacker)

{

if (!(attacker->client) && !(attacker->svflags & SVF_MONSTER))

return;

if (attacker == targ || attacker == targ->enemy)

return;

// if we are a good guy monster and our attacker is a player

// or another good guy, do not get mad at them

if (targ->monsterinfo.aiflags & AI_GOOD_GUY) {

if (attacker->client

|| (attacker->monsterinfo.aiflags & AI_GOOD_GUY))

return;

}

// we now know that we are not both good guys

// if attacker is a client, get mad at them because he's good and we're not

if (attacker->client) {

targ->monsterinfo.aiflags &= ~AI_SOUND_TARGET;

// this can only happen in coop (both new and old enemies are clients)

// only switch if can't see the current enemy

if (targ->enemy && targ->enemy->client) {

if (visible(targ, targ->enemy)) {

targ->oldenemy = attacker;

return;

}

targ->oldenemy = targ->enemy;

}

targ->enemy = attacker;

if (!(targ->monsterinfo.aiflags & AI_DUCKED))

FoundTarget(targ);

return;

}

// it's the same base (walk/swim/fly) type and a different classname and it's not a tank

// (they spray too much), get mad at them

if (((targ->flags & (FL_FLY | FL_SWIM)) ==

(attacker->flags & (FL_FLY | FL_SWIM)))

&& (strcmp(targ->classname, attacker->classname) != 0)

&& (strcmp(attacker->classname, "monster_tank") != 0)

&& (strcmp(attacker->classname, "monster_supertank") != 0)

&& (strcmp(attacker->classname, "monster_makron") != 0)

&& (strcmp(attacker->classname, "monster_jorg") != 0)) {

if (targ->enemy && targ->enemy->client)

targ->oldenemy = targ->enemy;

targ->enemy = attacker;

if (!(targ->monsterinfo.aiflags & AI_DUCKED))

FoundTarget(targ);

}

// if they *meant* to shoot us, then shoot back

else if (attacker->enemy == targ) {

if (targ->enemy && targ->enemy->client)

targ->oldenemy = targ->enemy;

targ->enemy = attacker;

if (!(targ->monsterinfo.aiflags & AI_DUCKED))

FoundTarget(targ);

}

// otherwise get mad at whoever they are mad at (help our buddy) unless it is us!

else if (attacker->enemy && attacker->enemy != targ) {

if (targ->enemy && targ->enemy->client)

targ->oldenemy = targ->enemy;

targ->enemy = attacker->enemy;

if (!(targ->monsterinfo.aiflags & AI_DUCKED))

FoundTarget(targ);

}

}

qboolean CheckTeamDamage(edict_t * targ, edict_t * attacker)

{

//FIXME make the next line real and uncomment this block

// if ((ability to damage a teammate == OFF) && (targ's team == attacker's team))

return false;

}

void T_Damage(edict_t * targ, edict_t * inflictor, edict_t * attacker,

vec3_t dir, vec3_t point, vec3_t normal, int damage,

int knockback, int dflags, int mod)

{

gclient_t *client;

int take;

int save;

int asave;

int psave;

int te_sparks;

if (!targ->takedamage)

return;

// friendly fire avoidance

// if enabled you can't hurt teammates (but you can hurt yourself)

// knockback still occurs

if ((targ != attacker)

&&

((deathmatch->value

&& ((int)(dmflags->value) & (DF_MODELTEAMS | DF_SKINTEAMS)))

|| coop->value)) {

if (OnSameTeam(targ, attacker)) {

if ((int)(dmflags->value) & DF_NO_FRIENDLY_FIRE)

damage = 0;

else

mod |= MOD_FRIENDLY_FIRE;

}

}

meansOfDeath = mod;

// easy mode takes half damage

if (skill->value == 0 && deathmatch->value == 0 && targ->client) {

damage *= 0.5;

if (!damage)

damage = 1;

}

client = targ->client;

if (dflags & DAMAGE_BULLET)

te_sparks = TE_BULLET_SPARKS;

else

te_sparks = TE_SPARKS;

VectorNormalize(dir);

// bonus damage for suprising a monster

if (!(dflags & DAMAGE_RADIUS) && (targ->svflags & SVF_MONSTER)

&& (attacker->client) && (!targ->enemy) && (targ->health > 0))

damage *= 2;

if (targ->flags & FL_NO_KNOCKBACK)

knockback = 0;

// figure momentum add

if (!(dflags & DAMAGE_NO_KNOCKBACK)) {

if ((knockback) && (targ->movetype != MOVETYPE_NONE)

&& (targ->movetype != MOVETYPE_BOUNCE)

&& (targ->movetype != MOVETYPE_PUSH)

&& (targ->movetype != MOVETYPE_STOP)) {

vec3_t kvel;

float mass;

if (targ->mass < 50)

mass = 50;

else

mass = targ->mass;

if (targ->client && attacker == targ)

VectorScale(dir, 1600.0 * (float)knockback / mass, kvel); // the rocket jump hack...

else

VectorScale(dir,

500.0 * (float)knockback / mass,

kvel);

VectorAdd(targ->velocity, kvel, targ->velocity);

}

}

take = damage;

save = 0;

// check for godmode

if ((targ->flags & FL_GODMODE) && !(dflags & DAMAGE_NO_PROTECTION)) {

take = 0;

save = damage;

SpawnDamage(te_sparks, point, normal, save);

}

// check for invincibility

if ((client && client->invincible_framenum > level.framenum)

&& !(dflags & DAMAGE_NO_PROTECTION)) {

if (targ->pain_debounce_time < level.time) {

gi.sound(targ, CHAN_ITEM,

gi.soundindex("items/protect4.wav"), 1,

ATTN_NORM, 0);

targ->pain_debounce_time = level.time + 2;

}

take = 0;

save = damage;

}

psave = CheckPowerArmor(targ, point, normal, take, dflags);

take -= psave;

asave = CheckArmor(targ, point, normal, take, te_sparks, dflags);

take -= asave;

//treat cheat/powerup savings the same as armor

asave += save;

// team damage avoidance

if (!(dflags & DAMAGE_NO_PROTECTION) && CheckTeamDamage(targ, attacker))

return;

// do the damage

if (take) {

if ((targ->svflags & SVF_MONSTER) || (client))

SpawnDamage(TE_BLOOD, point, normal, take);

else

SpawnDamage(te_sparks, point, normal, take);

targ->health = targ->health - take;

if (targ->health <= 0) {

if ((targ->svflags & SVF_MONSTER) || (client))

targ->flags |= FL_NO_KNOCKBACK;

Killed(targ, inflictor, attacker, take, point);

return;

}

}

if (targ->svflags & SVF_MONSTER) {

M_ReactToDamage(targ, attacker);

if (!(targ->monsterinfo.aiflags & AI_DUCKED) && (take)) {

targ->pain(targ, attacker, knockback, take);

// nightmare mode monsters don't go into pain frames often

if (skill->value == 3)

targ->pain_debounce_time = level.time + 5;

}

} else if (client) {

if (!(targ->flags & FL_GODMODE) && (take))

targ->pain(targ, attacker, knockback, take);

} else if (take) {

if (targ->pain)

targ->pain(targ, attacker, knockback, take);

}

// 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) {

client->damage_parmor += psave;

client->damage_armor += asave;

client->damage_blood += take;

client->damage_knockback += knockback;

VectorCopy(point, client->damage_from);

}

}

/*

============

T_RadiusDamage

============

*/

void T_RadiusDamage(edict_t * inflictor, edict_t * attacker, float damage,

edict_t * ignore, float radius, int mod)

{

float points;

edict_t *ent = NULL;

vec3_t v;

vec3_t dir;

while ((ent = findradius(ent, inflictor->s.origin, radius)) != NULL) {

if (ent == ignore)

continue;

if (!ent->takedamage)

continue;

VectorAdd(ent->mins, ent->maxs, v);

VectorMA(ent->s.origin, 0.5, v, v);

VectorSubtract(inflictor->s.origin, v, v);

points = damage - 0.5 * VectorLength(v);

if (ent == attacker)

points = points * 0.5;

if (points > 0) {

if (CanDamage(ent, inflictor)) {

VectorSubtract(ent->s.origin,

inflictor->s.origin, dir);

T_Damage(ent, inflictor, attacker, dir,

inflictor->s.origin, vec3_origin,

(int)points, (int)points,

DAMAGE_RADIUS, mod);

}

}

}

}