Implement breath timeouts for dragons, draconians, and, slightly, drakes.

This commit is only designed to implement breath-weapon timeouts for
draconians and dragons of every taste and flavour. This is slightly
problematic because it relies on mons_genus to return MONS_DRAGON, and
usees this to determine whether or not the monster should be allowed to
use the breath weapon.

The current time-out is 1d5. I had previously suggested
1+random2(10-(HD/3)) but it was suggested this might be a bit too much.
1d5 is subject to change, of course, and as this uses a function to set
the time-out, the exact value can be defined per-monster, per-genus,
etc.

Hopefully, I've caught every use of breath weapon. I need to test drakes
a little bit more extensively.

Problematically, the code currently classes a breath weapon either by a
draconian's breath weapon being cast (in mon-cast.cc:1684) and the
monster's genus being draconian, or the monster's genus being a dragon.
Abilities are handled differently.

This might thus prove problematic for monsters which have both beams for
breath weapons, as well as other auxiliary spells. These, if they exist
(and I do not think they currently do), would be unusable until the end
of the duration.

Also, it nerfs dragons a bit! Pearl dragons will no longer spam holy
breath at you, etc: this primarily is the reason for the code. If it's
found to be too much of a nerf, it maybe be adjusted to only trigger on
certain types of dragon, etc.

1 files changed, 1 insertions, 0 deletions

diff --git a/crawl-ref/source/mon-cast.h b/crawl-ref/source/mon-cast.h
index 6537aeb61e..4b3d64f659 100644
--- a/crawl-ref/source/mon-cast.h
+++ b/crawl-ref/source/mon-cast.h
@@ -29,6 +29,7 @@ void mons_cast_haunt(monster* mons);
 void mons_cast_mislead(monster* mons);
 bool actor_is_illusion_cloneable(actor *target);
 void mons_cast_spectral_orcs(monster* mons);
+void setup_breath_timeout(monster* mons);
 
 bool ms_direct_nasty(spell_type monspell);
 bool ms_useful_fleeing_out_of_sight(const monster* mon, spell_type monspell);