adds new acid spit genetics mutation obtainable through polysmorphs (#20474)

* Add files via upload

* Update DNA.dm

* Update polysmorphs.dm

* Update dna_injector.dm

* Update dna_injector.dm

* Update fire_breath.dm

* 18 seconds is fairer

* Update neurotoxin.dm

* Update fire_breath.dm

* Update code/modules/projectiles/projectile/special/neurotoxin.dm

Co-authored-by: Molti <108117184+Moltijoe@users.noreply.github.com>

* bad molti code fixed!!!

* Update fire_breath.dm

* Add files via upload

* Update neurotoxin.dm

* Update acid_spit.dm

* Update yogstation.dme

* Update acid_spit.dm

* Update acid_spit.dm

* will just not fire at all if your mouth is covered

too complicated to set up specific scenarios on how a breath mask or hardsuit helmet or gas mask or whatever should react differently from being acided

* isn't the end result the same?

Co-authored-by: Molti <108117184+Moltijoe@users.noreply.github.com>

* Update code/datums/mutations/acid_spit.dm

Co-authored-by: Molti <108117184+Moltijoe@users.noreply.github.com>

* oopsies

Co-authored-by: Molti <108117184+Moltijoe@users.noreply.github.com>

---------

Co-authored-by: Molti <108117184+Moltijoe@users.noreply.github.com>

code/__DEFINES/DNA.dm

@@ -56,6 +56,7 @@
 #define EXTRASTUN	/datum/mutation/human/extrastun
 #define GELADIKINESIS		/datum/mutation/human/geladikinesis
 #define CRYOKINESIS /datum/mutation/human/cryokinesis
+#define ACIDSPIT	/datum/mutation/human/acidspit
 #define CEREBRAL	/datum/mutation/human/cerebral
 #define THICKSKIN	/datum/mutation/human/thickskin
 #define DENSEBONES	/datum/mutation/human/densebones

code/datums/mutations/acid_spit.dm

@@ -0,0 +1,51 @@
+/datum/mutation/human/acidspit // polysmorph inert mutation
+	name = "Acid Spit"
+	desc = "An ancient mutation from xenomorphs that changes the salivary glands to produce acid"
+	instability = 50
+	difficulty = 12
+	locked = TRUE
+	text_gain_indication = span_notice("Your saliva burns your mouth!")
+	text_lose_indication = span_notice("Your saliva cools down.")
+	power_path = /datum/action/cooldown/spell/pointed/projectile/acid_spit
+
+/datum/action/cooldown/spell/pointed/projectile/acid_spit
+	name = "Acid Spit"
+	desc = "You focus your corrosive saliva to spit at your target"
+	button_icon = 'icons/mob/actions/actions_xeno.dmi'
+	button_icon_state = "alien_neurotoxin_0"
+	active_icon_state = "alien_neurotoxin_1"
+	base_icon_state = "alien_neurotoxin_0"
+	active_overlay_icon_state = "bg_spell_border_active_red"
+	cooldown_time = 18 SECONDS
+	spell_requirements = NONE
+	antimagic_flags = NONE
+	school = SCHOOL_EVOCATION
+	sound = 'sound/effects/alien_spitacid.ogg'
+
+	active_msg = "You focus your acid spit!"
+	deactive_msg = "You relax."
+	projectile_type = /obj/item/projectile/bullet/acid
+
+/datum/action/cooldown/spell/pointed/projectile/acid_spit/can_cast_spell(feedback)
+	. = ..()
+	if(!get_location_accessible(owner, BODY_ZONE_PRECISE_MOUTH))
+		to_chat(owner, span_notice("Something is covering your mouth!"))
+		return FALSE
+
+/obj/item/projectile/bullet/acid
+	name = "acid spit"
+	icon_state = "neurotoxin"
+	damage = 2
+	damage_type = BURN
+	flag = BIO
+	range = 7
+	speed = 1.8 // spit is not very fast
+
+obj/item/projectile/bullet/acid/on_hit(atom/target, blocked = FALSE)
+	if(isalien(target)) // shouldn't work on xenos
+		nodamage = TRUE
+	else if(!isopenturf(target))
+		target.acid_act(50, 15) // does good damage to objects and structures
+	else if(iscarbon(target))
+		target.acid_act(18, 15) // balanced
+	return ..()

code/game/objects/items/dna_injector.dm

@@ -105,6 +105,16 @@
 	desc = "Restores the dragon ancestry."
 	add_mutations = list(FIREBREATH)
 
+/obj/item/dnainjector/acidspit
+	name = "\improper DNA injector (Acid Spit)"
+	desc = "Lets you spit acid."
+	add_mutations = list(ACIDSPIT)
+
+/obj/item/dnainjector/antispit
+	name ="\improper DNA injector (Anti-Acid Spit)"
+	desc = "Cures your corrosive saliva"
+	remove_mutations = list(ACIDSPIT)
+
 /obj/item/dnainjector/xraymut
 	name = "\improper DNA injector (X-ray)"
 	desc = "Finally you can see what the Captain does."

code/modules/mob/living/carbon/human/species_types/polysmorphs.dm

@@ -18,6 +18,7 @@
 	acidmod = 0.2 //Their blood is literally acid
 	action_speed_coefficient = 1.1 //claws aren't dextrous like hands
 	speedmod = -0.1 //apex predator humanoid hybrid
+	inert_mutation = ACIDSPIT
 	punchdamagehigh = 11 //slightly better high end of damage
 	punchstunthreshold = 11 //technically slightly worse stunchance
 	payday_modifier = 0.3 //Some are quite literally slaves + they HAVE to work for NT

yogstation.dme

@@ -707,6 +707,7 @@
 #include "code\datums\mood_events\mood_event.dm"
 #include "code\datums\mood_events\needs_events.dm"
 #include "code\datums\mutations\_combined.dm"
+#include "code\datums\mutations\acid_spit.dm"
 #include "code\datums\mutations\antenna.dm"
 #include "code\datums\mutations\autotomy.dm"
 #include "code\datums\mutations\body.dm"