BitBoard Bishops::getAttacksFrom(Square square, BitBoard targets,
BitBoard friendlies) {
BitBoard blockers((targets | friendlies) & _moveMask[square]);
unsigned int index((blockers * _magicNumber[square]) >> _magicShift[square]);
BitBoard attacks(*(_magicAttacks[square] + index));
return attacks & ~friendlies;
}
// Checks if any queen attacks another
bool attacks(int n)
{
for(int i = 0; i < n; ++i)
for(int j = i + 1; j < n; ++j)
if(attacks(i, j))
return true;
return false;
}
// Search for a solution using backtracking
void search(int n)
{
if(n != NSIDE)
{
for(int i = 0; i < NSIDE; ++i)
{
pos[n] = i;
if(!attacks(n + 1))
search(n + 1);
}
}
else
print();
}
/* Function used when someone attacks someone else with an artifact
* weapon. Only adds the special (artifact) damage, and returns a 1 if it
* did something special (in which case the caller won't print the normal
* hit message). This should be called once upon every artifact attack;
* dmgval() no longer takes artifact bonuses into account. Possible
* extension: change the killer so that when an orc kills you with
* Stormbringer it's "killed by Stormbringer" instead of "killed by an orc".
*/
boolean artifact_hit(
struct monst *magr,
struct monst *mdef,
struct obj *otmp,
int *dmgptr,
int dieroll /* needed for Magicbane and vorpal blades */
)
{
boolean youattack = (magr == &youmonst);
boolean youdefend = (mdef == &youmonst);
boolean vis = (!youattack && magr && cansee(magr->mx, magr->my))
|| (!youdefend && cansee(mdef->mx, mdef->my))
|| (youattack && u.uswallow && mdef == u.ustuck && !Blind);
boolean realizes_damage;
char hittee[BUFSZ];
strcpy(hittee, youdefend ? "you" : mon_nam(mdef));
/* The following takes care of most of the damage, but not all--
* the exception being for level draining, which is specially
* handled. Messages are done in this function, however.
*/
*dmgptr += spec_dbon(otmp, mdef, *dmgptr);
if (youattack && youdefend) {
impossible("attacking yourself with weapon?");
return FALSE;
}
realizes_damage = (youdefend || vis ||
/* feel the effect even if not seen */
(youattack && mdef == u.ustuck));
/* the four basic attacks: fire, cold, shock and missiles */
if (attacks(AD_FIRE, otmp)) {
if (realizes_damage)
pline("The fiery blade %s %s%c",
!spec_dbon_applies ? "hits" :
(mdef->data == &mons[PM_WATER_ELEMENTAL]) ?
"vaporizes part of" : "burns",
hittee, !spec_dbon_applies ? '.' : '!');
if (!rn2(4)) destroy_mitem(mdef, POTION_CLASS, AD_FIRE);
if (!rn2(4)) destroy_mitem(mdef, SCROLL_CLASS, AD_FIRE);
if (!rn2(7)) destroy_mitem(mdef, SPBOOK_CLASS, AD_FIRE);
if (youdefend && Slimed) burn_away_slime();
return realizes_damage;
}
if (attacks(AD_COLD, otmp)) {
if (realizes_damage)
pline("The ice-cold blade %s %s%c",
!spec_dbon_applies ? "hits" : "freezes",
hittee, !spec_dbon_applies ? '.' : '!');
if (!rn2(4)) destroy_mitem(mdef, POTION_CLASS, AD_COLD);
return realizes_damage;
}
if (attacks(AD_ELEC, otmp)) {
if (realizes_damage)
pline("The massive hammer hits%s %s%c",
!spec_dbon_applies ? "" : "! Lightning strikes",
hittee, !spec_dbon_applies ? '.' : '!');
if (!rn2(5)) destroy_mitem(mdef, RING_CLASS, AD_ELEC);
if (!rn2(5)) destroy_mitem(mdef, WAND_CLASS, AD_ELEC);
return realizes_damage;
}
if (attacks(AD_MAGM, otmp)) {
if (realizes_damage)
pline("The imaginary widget hits%s %s%c",
!spec_dbon_applies ? "" :
"! A hail of magic missiles strikes",
hittee, !spec_dbon_applies ? '.' : '!');
return realizes_damage;
}
if (attacks(AD_STUN, otmp) && dieroll <= MB_MAX_DIEROLL) {
/* Magicbane's special attacks (possibly modifies hittee[]) */
return magicbane_hit(magr, mdef, otmp, dmgptr, dieroll, vis, hittee);
}
if (!spec_dbon_applies) {
/* since damage bonus didn't apply, nothing more to do;
no further attacks have side-effects on inventory */
return FALSE;
}
/* Tsurugi of Muramasa, Vorpal Blade */
if (spec_ability(otmp, SPFX_BEHEAD))
return artifact_hit_behead(magr, mdef, otmp, dmgptr, dieroll);
/* Stormbringer */
if (spec_ability(otmp, SPFX_DRLI))
return artifact_hit_drainlife(magr, mdef, otmp, dmgptr);
return FALSE;
}