/**
* Determines whether the given monster successfully resists the given effect.
*
* If MON_TMD_FLG_NOFAIL is set in `flag`, this returns FALSE.
* Then we determine if the monster resists the effect for some racial
* reason. For example, the monster might have the NO_SLEEP flag, in which
* case it always resists sleep. Or if it breathes chaos, it always resists
* confusion. If the given monster doesn't resist for any of these reasons,
* then it makes a saving throw. If MON_TMD_MON_SOURCE is set in `flag`,
* indicating that another monster caused this effect, then the chance of
* success on the saving throw just depends on the monster's native depth.
* Otherwise, the chance of success decreases as `timer` increases.
*
* Also marks the lore for any appropriate resists.
*/
static bool mon_resist_effect(const monster_type *m_ptr, int ef_idx, int timer, u16b flag)
{
mon_timed_effect *effect;
int resist_chance;
const monster_race *r_ptr;
monster_lore *l_ptr;
assert(ef_idx >= 0 && ef_idx < MON_TMD_MAX);
effect = &effects[ef_idx];
assert(m_ptr);
r_ptr = &r_info[m_ptr->r_idx];
l_ptr = &l_list[m_ptr->r_idx];
/* Hasting never fails */
if (ef_idx == MON_TMD_FAST) return (FALSE);
/* Some effects are marked to never fail */
if (flag & MON_TMD_FLG_NOFAIL) return (FALSE);
/* A sleeping monster resists further sleeping */
if (ef_idx == MON_TMD_SLEEP && m_ptr->m_timed[ef_idx]) return (TRUE);
/* If the monster resists innately, learn about it */
if (rf_has(r_ptr->flags, effect->flag_resist)) {
if (m_ptr->ml)
rf_on(l_ptr->flags, effect->flag_resist);
return (TRUE);
}
/* Monsters with specific breaths resist stunning*/
if (ef_idx == MON_TMD_STUN && (rsf_has(r_ptr->spell_flags, RSF_BR_SOUN) ||
rsf_has(r_ptr->spell_flags, RSF_BR_WALL)))
{
/* Add the lore */
if (m_ptr->ml)
{
if (rsf_has(r_ptr->spell_flags, RSF_BR_SOUN))
rsf_on(l_ptr->spell_flags, RSF_BR_SOUN);
if (rsf_has(r_ptr->spell_flags, RSF_BR_WALL))
rsf_on(l_ptr->spell_flags, RSF_BR_WALL);
}
return (TRUE);
}
/* Monsters with specific breaths resist confusion */
if ((ef_idx == MON_TMD_CONF) &&
((rsf_has(r_ptr->spell_flags, RSF_BR_CHAO)) ||
(rsf_has(r_ptr->spell_flags, RSF_BR_CONF))) )
{
/* Add the lore */
if (m_ptr->ml)
{
if (rsf_has(r_ptr->spell_flags, RSF_BR_CHAO))
rsf_on(l_ptr->spell_flags, RSF_BR_CHAO);
if (rsf_has(r_ptr->spell_flags, RSF_BR_CONF))
rsf_on(l_ptr->spell_flags, RSF_BR_CONF);
}
return (TRUE);
}
/* Inertia breathers resist slowing */
if (ef_idx == MON_TMD_SLOW && rsf_has(r_ptr->spell_flags, RSF_BR_INER))
{
rsf_on(l_ptr->spell_flags, RSF_BR_INER);
return (TRUE);
}
/* Calculate the chance of the monster making its saving throw. */
if (ef_idx == MON_TMD_SLEEP)
timer /= 25; /* Hack - sleep uses much bigger numbers */
if (flag & MON_TMD_MON_SOURCE)
resist_chance = r_ptr->level;
else
resist_chance = r_ptr->level + 40 - (timer / 2);
if (randint0(100) < resist_chance) return (TRUE);
/* Uniques are doubly hard to affect */
if (rf_has(r_ptr->flags, RF_UNIQUE))
if (randint0(100) < resist_chance) return (TRUE);
return (FALSE);
}
/**
* Determines whether the given monster successfully resists the given effect.
*
* If MON_TMD_FLG_NOFAIL is set in `flag`, this returns false.
* Then we determine if the monster resists the effect for some racial
* reason. For example, the monster might have the NO_SLEEP flag, in which
* case it always resists sleep. Or if it breathes chaos, it always resists
* confusion. If the given monster doesn't resist for any of these reasons,
* then it makes a saving throw. If MON_TMD_MON_SOURCE is set in `flag`,
* indicating that another monster caused this effect, then the chance of
* success on the saving throw just depends on the monster's native depth.
* Otherwise, the chance of success decreases as `timer` increases.
*
* Also marks the lore for any appropriate resists.
*/
static bool mon_resist_effect(const struct monster *mon, int ef_idx, int timer, u16b flag)
{
struct mon_timed_effect *effect;
int resist_chance;
struct monster_lore *lore;
assert(ef_idx >= 0 && ef_idx < MON_TMD_MAX);
assert(mon);
effect = &effects[ef_idx];
lore = get_lore(mon->race);
/* Hasting never fails */
if (ef_idx == MON_TMD_FAST) return (false);
/* Some effects are marked to never fail */
if (flag & MON_TMD_FLG_NOFAIL) return (false);
/* A sleeping monster resists further sleeping */
if (ef_idx == MON_TMD_SLEEP && mon->m_timed[ef_idx]) return (true);
/* If the monster resists innately, learn about it */
if (rf_has(mon->race->flags, effect->flag_resist)) {
if (mflag_has(mon->mflag, MFLAG_VISIBLE))
rf_on(lore->flags, effect->flag_resist);
return (true);
}
/* Monsters with specific breaths resist stunning */
if (ef_idx == MON_TMD_STUN &&
(rsf_has(mon->race->spell_flags, RSF_BR_SOUN) ||
rsf_has(mon->race->spell_flags, RSF_BR_WALL))) {
/* Add the lore */
if (mflag_has(mon->mflag, MFLAG_VISIBLE)) {
if (rsf_has(mon->race->spell_flags, RSF_BR_SOUN))
rsf_on(lore->spell_flags, RSF_BR_SOUN);
if (rsf_has(mon->race->spell_flags, RSF_BR_WALL))
rsf_on(lore->spell_flags, RSF_BR_WALL);
}
return (true);
}
/* Monsters with specific breaths resist confusion */
if ((ef_idx == MON_TMD_CONF) &&
rsf_has(mon->race->spell_flags, RSF_BR_CHAO)) {
/* Add the lore */
if (mflag_has(mon->mflag, MFLAG_VISIBLE))
if (rsf_has(mon->race->spell_flags, RSF_BR_CHAO))
rsf_on(lore->spell_flags, RSF_BR_CHAO);
return (true);
}
/* Inertia breathers resist slowing */
if (ef_idx == MON_TMD_SLOW && rsf_has(mon->race->spell_flags, RSF_BR_INER)){
rsf_on(lore->spell_flags, RSF_BR_INER);
return (true);
}
/* Calculate the chance of the monster making its saving throw. */
if (ef_idx == MON_TMD_SLEEP)
timer /= 25; /* Hack - sleep uses much bigger numbers */
if (flag & MON_TMD_MON_SOURCE)
resist_chance = mon->race->level;
else
resist_chance = mon->race->level + 40 - (timer / 2);
if (randint0(100) < resist_chance) return (true);
/* Uniques are doubly hard to affect */
if (rf_has(mon->race->flags, RF_UNIQUE))
if (randint0(100) < resist_chance) return (true);
return (false);
}
/**
* Creatures can cast spells, shoot missiles, and breathe.
*
* Returns "true" if a spell (or whatever) was (successfully) cast.
*
* XXX XXX XXX This function could use some work, but remember to
* keep it as optimized as possible, while retaining generic code.
*
* Verify the various "blind-ness" checks in the code.
*
* XXX XXX XXX Note that several effects should really not be "seen"
* if the player is blind.
*
* Perhaps monsters should breathe at locations *near* the player,
* since this would allow them to inflict "partial" damage.
*
* Perhaps smart monsters should decline to use "bolt" spells if
* there is a monster in the way, unless they wish to kill it.
*
* It will not be possible to "correctly" handle the case in which a
* monster attempts to attack a location which is thought to contain
* the player, but which in fact is nowhere near the player, since this
* might induce all sorts of messages about the attack itself, and about
* the effects of the attack, which the player might or might not be in
* a position to observe. Thus, for simplicity, it is probably best to
* only allow "faulty" attacks by a monster if one of the important grids
* (probably the initial or final grid) is in fact in view of the player.
* It may be necessary to actually prevent spell attacks except when the
* monster actually has line of sight to the player. Note that a monster
* could be left in a bizarre situation after the player ducked behind a
* pillar and then teleported away, for example.
*
* Note that this function attempts to optimize the use of spells for the
* cases in which the monster has no spells, or has spells but cannot use
* them, or has spells but they will have no "useful" effect. Note that
* this function has been an efficiency bottleneck in the past.
*
* Note the special "MFLAG_NICE" flag, which prevents a monster from using
* any spell attacks until the player has had a single chance to move.
*/
bool make_attack_spell(struct monster *mon)
{
int chance, thrown_spell, rlev, failrate;
bitflag f[RSF_SIZE];
struct monster_lore *lore = get_lore(mon->race);
char m_name[80], m_poss[80], ddesc[80];
/* Player position */
int px = player->px;
int py = player->py;
/* Extract the blind-ness */
bool blind = (player->timed[TMD_BLIND] ? true : false);
/* Extract the "see-able-ness" */
bool seen = (!blind && mflag_has(mon->mflag, MFLAG_VISIBLE));
/* Assume "normal" target */
bool normal = true;
/* Cannot cast spells when confused */
if (mon->m_timed[MON_TMD_CONF]) return (false);
/* Cannot cast spells when nice */
if (mflag_has(mon->mflag, MFLAG_NICE)) return false;
/* Hack -- Extract the spell probability */
chance = (mon->race->freq_innate + mon->race->freq_spell) / 2;
/* Not allowed to cast spells */
if (!chance) return false;
/* Only do spells occasionally */
if (randint0(100) >= chance) return false;
/* Hack -- require projectable player */
if (normal) {
/* Check range */
if (mon->cdis > z_info->max_range)
return false;
/* Check path */
if (!projectable(cave, mon->fy, mon->fx, py, px, PROJECT_NONE))
return false;
}
/* Extract the monster level */
rlev = ((mon->race->level >= 1) ? mon->race->level : 1);
/* Extract the racial spell flags */
rsf_copy(f, mon->race->spell_flags);
/* Allow "desperate" spells */
if (rf_has(mon->race->flags, RF_SMART) &&
mon->hp < mon->maxhp / 10 &&
randint0(100) < 50)
/* Require intelligent spells */
ignore_spells(f, RST_BOLT | RST_BALL | RST_BREATH | RST_ATTACK | RST_INNATE);
/* Remove the "ineffective" spells */
remove_bad_spells(mon, f);
/* Check whether summons and bolts are worth it. */
if (!rf_has(mon->race->flags, RF_STUPID)) {
/* Check for a clean bolt shot */
if (test_spells(f, RST_BOLT) &&
!projectable(cave, mon->fy, mon->fx, py, px, PROJECT_STOP))
/* Remove spells that will only hurt friends */
ignore_spells(f, RST_BOLT);
/* Check for a possible summon */
if (!(summon_possible(mon->fy, mon->fx)))
/* Remove summoning spells */
ignore_spells(f, RST_SUMMON);
}
/* No spells left */
if (rsf_is_empty(f)) return false;
/* Get the monster name (or "it") */
monster_desc(m_name, sizeof(m_name), mon, MDESC_STANDARD);
/* Get the monster possessive ("his"/"her"/"its") */
monster_desc(m_poss, sizeof(m_poss), mon, MDESC_PRO_VIS | MDESC_POSS);
/* Get the "died from" name */
monster_desc(ddesc, sizeof(ddesc), mon, MDESC_DIED_FROM);
/* Choose a spell to cast */
thrown_spell = choose_attack_spell(f);
/* Abort if no spell was chosen */
if (!thrown_spell) return false;
/* If we see an unaware monster try to cast a spell, become aware of it */
if (mflag_has(mon->mflag, MFLAG_UNAWARE))
become_aware(mon);
/* Calculate spell failure rate */
failrate = 25 - (rlev + 3) / 4;
if (mon->m_timed[MON_TMD_FEAR])
failrate += 20;
/* Stupid monsters will never fail (for jellies and such) */
if (rf_has(mon->race->flags, RF_STUPID))
failrate = 0;
/* Check for spell failure (innate attacks never fail) */
if (!mon_spell_is_innate(thrown_spell) && (randint0(100) < failrate)) {
/* Message */
msg("%s tries to cast a spell, but fails.", m_name);
return true;
}
/* Cast the spell. */
disturb(player, 1);
do_mon_spell(thrown_spell, mon, seen);
/* Remember what the monster did to us */
if (seen) {
rsf_on(lore->spell_flags, thrown_spell);
/* Innate spell */
if (mon_spell_is_innate(thrown_spell)) {
if (lore->cast_innate < UCHAR_MAX)
lore->cast_innate++;
} else {
/* Bolt or Ball, or Special spell */
if (lore->cast_spell < UCHAR_MAX)
lore->cast_spell++;
}
}
/* Always take note of monsters that kill you */
if (player->is_dead && (lore->deaths < SHRT_MAX)) {
lore->deaths++;
}
/* Record any new info */
lore_update(mon->race, lore);
/* A spell was cast */
return true;
}
