Shielding Auras (#8760)

Ports Baystation12/Baystation12#19992 and Baystation12/Baystation12#27266.

    Added a personal shield device to the traitor tools uplink.
    Added a radiant shielding aura spell to Battlemage and Cleric.
    Added an exosuit shield drone to the mechfab.

This works, but I'm not entirely happy with the sprites. The personal shield has no on-mob shimmer, it uses a mindbatterer grenade as an icon sprite. The wizard radiant spell uses a pretty big and janky sprite as an on-mob, and the exosuit's shield sprite doesn't follow the dir the mech faces, but that one I can maybe fix on my own. If anyone knows about that last one, lemme know, Bay had code for it that we do not.

code/game/objects/auras/auras.dm

@@ -0,0 +1,31 @@
+/*Auras are simple: They are simple overriders for attackbys, bullet_act, damage procs, etc. They also tick after their respective mob.
+They should be used for undeterminate mob effects, like for instance a toggle-able forcefield, or indestructability as long as you don't move.
+They should also be used for when you want to effect the ENTIRE mob, like having an armor buff or showering candy everytime you walk.
+*/
+
+/obj/aura
+	var/mob/living/user
+
+/obj/aura/Destroy()
+	if(user)
+		user.remove_aura(src)
+	return ..()
+
+/obj/aura/proc/added_to(var/mob/living/target)
+	user = target
+	user.add_aura(src)
+
+/obj/aura/proc/removed()
+	user = null
+
+/obj/aura/proc/life_tick()
+	return FALSE
+
+/obj/aura/attackby(obj/item/I, mob/user)
+	return FALSE
+
+/obj/aura/bullet_act(obj/item/projectile/P, def_zone)
+	return FALSE
+
+/obj/aura/hitby(atom/movable/M, speed)
+	return FALSE

code/game/objects/auras/personal_shield.dm

@@ -0,0 +1,34 @@
+/obj/aura/personal_shield
+	name = "personal shield"
+
+/obj/aura/personal_shield/added_to(mob/living/L)
+	..()
+	playsound(user, 'sound/weapons/flash.ogg', 35, 1)
+	to_chat(user, SPAN_NOTICE("You feel your body prickle as \the [src] comes online."))
+
+/obj/aura/personal_shield/bullet_act(obj/item/projectile/P, var/def_zone)
+	user.visible_message(SPAN_WARNING("\The [user]'s [src.name] flashes before \the [P] can hit them!"))
+	
+	flick("shield_impact", src)
+	playsound(user, 'sound/effects/basscannon.ogg', 35, TRUE)
+	return AURA_FALSE|AURA_CANCEL
+
+/obj/aura/personal_shield/removed()
+	to_chat(user, SPAN_WARNING("\The [src] goes offline!"))
+	playsound(user, 'sound/mecha/internaldmgalarm.ogg', 25, TRUE)
+	..()
+
+/obj/aura/personal_shield/device
+	var/obj/item/device/personal_shield/shield
+
+/obj/aura/personal_shield/device/bullet_act()
+	. = ..()
+	if(shield)
+		shield.take_charge()
+
+/obj/aura/personal_shield/device/proc/set_shield(var/user_shield)
+	shield = user_shield
+
+/obj/aura/personal_shield/device/Destroy()
+	shield = null
+	return ..()

code/game/objects/auras/radiant_aura.dm

@@ -0,0 +1,21 @@
+/obj/aura/radiant_aura
+	name = "radiant aura"
+	icon = 'icons/effects/effects.dmi'
+	icon_state = "at_shield1"
+	alpha = 75
+	layer = ABOVE_MOB_LAYER
+
+/obj/aura/radiant_aura/added_to(mob/living/user)
+	..()
+	to_chat(user, SPAN_NOTICE("A bubble of light appears around you, exuding protection and warmth."))
+	set_light(6, 6, COLOR_AMBER)
+
+/obj/aura/radiant_aura/Destroy()
+	to_chat(user, SPAN_WARNING("Your protective aura dissipates, leaving you feeling cold and unsafe."))
+	return ..()
+
+/obj/aura/radiant_aura/bullet_act(obj/item/projectile/P, var/def_zone)
+	if(P.check_armour == LASER)
+		user.visible_message(SPAN_WARNING("\The [P] refracts, bending into \the [user]'s aura."))
+		return AURA_FALSE
+	return FALSE

code/game/objects/items/devices/personal_shield.dm

@@ -0,0 +1,64 @@
+/obj/item/device/personal_shield
+	name = "personal shield"
+	desc = "Truely a life-saver: this device protects its user from being hit by objects moving very, very fast, though only for a few shots."
+	icon = 'icons/obj/device.dmi'
+	icon_state = "batterer"
+	var/next_recharge
+	var/uses = 5
+	var/obj/aura/personal_shield/device/shield
+
+/obj/item/device/personal_shield/examine(mob/user, distance)
+	..()
+	if(Adjacent(user))
+		to_chat(user, SPAN_NOTICE("\The [src] can absorb [uses] more shot\s."))
+
+/obj/item/device/personal_shield/Initialize()
+	. = ..()
+	START_PROCESSING(SSprocessing, src)
+
+/obj/item/device/personal_shield/process()
+	if(next_recharge < world.time)
+		uses = min(5, uses + 1)
+		if(uses == 1)
+			update_icon()
+		next_recharge = world.time + 1 MINUTE
+
+/obj/item/device/personal_shield/attack_self(mob/living/user)
+	if(uses && !shield)
+		shield = new /obj/aura/personal_shield/device(user)
+		shield.added_to(user)
+		shield.set_shield(src)
+	else
+		dissipate()
+
+/obj/item/device/personal_shield/Move()
+	dissipate()
+	return ..()
+
+/obj/item/device/personal_shield/forceMove()
+	dissipate()
+	return ..()
+
+/obj/item/device/personal_shield/proc/take_charge()
+	uses--
+	if(!uses)
+		to_chat(shield.user, FONT_LARGE(SPAN_WARNING("\The [src] begins to spark as it breaks!")))
+		QDEL_NULL(shield)
+		update_icon()
+		return
+
+/obj/item/device/personal_shield/update_icon()
+	if(uses)
+		icon_state = "batterer"
+	else
+		icon_state = "battererburnt"
+
+/obj/item/device/personal_shield/Destroy()
+	dissipate()
+	STOP_PROCESSING(SSprocessing, src)
+	return ..()
+
+/obj/item/device/personal_shield/proc/dissipate()
+	if(shield?.user)
+		to_chat(shield.user, FONT_LARGE(SPAN_WARNING("\The [src] fades around you, dissipating.")))
+	QDEL_NULL(shield)