Adds EPS-99 Pulse Shield Generator for mechs (#30043)

* EPS-99 Pulse Shield Generator

* Increased drain

* Increased energy drain more

* Uses the cool AT shield. Thanks colossus. And lints

* Fixes and oversight coverage

* Messages when shield is disabled.

* Fixes + shield alpha

* Shield sprites

code/game/mecha/equipment/mecha_equipment.dm

@@ -73,6 +73,13 @@
 /obj/item/mecha_parts/mecha_equipment/proc/action(atom/target)
 	return
 
+/obj/item/mecha_parts/mecha_equipment/proc/on_unequip()
+	chassis.selected = null
+	return
+
+/obj/item/mecha_parts/mecha_equipment/proc/on_equip(atom/target)
+	return
+
 /obj/item/mecha_parts/mecha_equipment/proc/start_cooldown()
 	set_ready_state(0)
 	chassis.use_power(energy_drain)

code/game/mecha/equipment/tools/other_tools.dm

@@ -138,6 +138,26 @@
 		start_cooldown()
 		return TRUE
 
+/obj/item/mecha_parts/mecha_equipment/pulse_shield
+	name = "EPS-99 pulse shield generator"
+	desc = "A shield module that covers the exosuit in an energy barrier that absorbs damage. Requires energy to operate."
+	icon_state = "mecha_pulse_shield"
+	origin_tech = "materials=4;combat=4"
+	equip_cooldown = 10
+	energy_drain = 50
+	range = 0
+
+/obj/item/mecha_parts/mecha_equipment/pulse_shield/on_equip()
+	chassis.update_icon(UPDATE_OVERLAYS)
+
+/obj/item/mecha_parts/mecha_equipment/pulse_shield/on_unequip()
+	. = ..()
+	chassis.update_icon(UPDATE_OVERLAYS)
+
+/obj/item/mecha_parts/mecha_equipment/pulse_shield/proc/attack_react(mob/user as mob)
+	if(action_checks(user))
+		start_cooldown()
+		return TRUE
 
 ////////////////////////////////// REPAIR DROID //////////////////////////////////////////////////
 
@@ -286,6 +306,9 @@
 		STOP_PROCESSING(SSobj, src)
 		set_ready_state(1)
 		return
+	if(istype(chassis.selected, /obj/item/mecha_parts/mecha_equipment/pulse_shield))
+		chassis.selected.on_unequip() // No shields while recharging
+		occupant_message("Shields disabled.")
 	var/cur_charge = chassis.get_charge()
 	if(isnull(cur_charge) || !chassis.cell)
 		STOP_PROCESSING(SSobj, src)

code/game/mecha/mecha.dm

@@ -166,6 +166,9 @@
 	. = ..()
 	underlays.Cut()
 	underlays += emissive_appearance(emissive_appearance_icon, "[icon_state]_lightmask")
+	overlays.Cut()
+	if(istype(selected, /obj/item/mecha_parts/mecha_equipment/pulse_shield) && !leg_overload_mode && !istype(cell, /obj/item/stock_parts/cell/infinite) && occupant)
+		overlays += mutable_appearance('icons/effects/effects.dmi', "at_shield2", MOB_LAYER + 0.01, alpha = 120)
 
 ////////////////////////
 ////// Helpers /////////
@@ -527,6 +530,16 @@
 	return facing_modifiers[MECHA_SIDE_ARMOUR] //always return non-0
 
 /obj/mecha/take_damage(damage_amount, damage_type = BRUTE, damage_flag = 0, sound_effect = 1, attack_dir)
+	for(var/obj/item/mecha_parts/mecha_equipment/pulse_shield/shield in equipment)
+		if(selected == shield && !leg_overload_mode && !istype(cell, /obj/item/stock_parts/cell/infinite) && occupant)
+			var/required_power = shield.energy_drain * damage_amount
+			if(cell && cell.use(required_power))
+				log_message("Took [damage_amount] points of damage. Damage absorbed by [shield].")
+				damage_amount = 0
+				spark_system.start()
+			else
+				occupant_message("<span class='userdanger'>Shield breached!</span>")
+				shield.on_unequip()
 	. = ..()
 	if(. && obj_integrity > 0)
 		spark_system.start()
@@ -630,6 +643,9 @@
 /obj/mecha/bullet_act(obj/item/projectile/Proj) //wrapper
 	log_message("Hit by projectile. Type: [Proj.name]([Proj.flag]).")
 	add_attack_logs(Proj.firer, OCCUPANT_LOGGING, "shot [Proj.name]([Proj.flag]) at mech [src]")
+	if(Proj.shield_buster && istype(selected, /obj/item/mecha_parts/mecha_equipment/pulse_shield))
+		occupant_message("<span class='userdanger'>Shield breached!</span>")
+		selected.on_unequip()
 	..()
 
 /obj/mecha/ex_act(severity, target)
@@ -695,6 +711,9 @@
 /obj/mecha/emp_act(severity)
 	if(emp_proof)
 		return
+	if(istype(selected, /obj/item/mecha_parts/mecha_equipment/pulse_shield))
+		occupant_message("<span class='userdanger'>Shield breached!</span>")
+		selected.on_unequip()
 	if(get_charge())
 		use_power((cell.charge/3)/(severity*2))
 		take_damage(30 / severity, BURN, ENERGY, 1)
@@ -768,6 +787,9 @@
 				W.forceMove(src)
 				cell = W
 				log_message("Powercell installed")
+				if(istype(selected, /obj/item/mecha_parts/mecha_equipment/pulse_shield) && istype(cell, /obj/item/stock_parts/cell/infinite))
+					occupant_message("<span class='danger'>The immense power of the cell overloads the shields.</span>")
+					selected.on_unequip()
 			else
 				to_chat(user, "<span class='notice'>There's already a powercell installed.</span>")
 		return

code/game/mecha/mecha_actions.dm

@@ -127,6 +127,8 @@
 		chassis.step_in = min(1, round(chassis.step_in / 2))
 		chassis.step_energy_drain = max(chassis.overload_step_energy_drain_min, chassis.step_energy_drain * chassis.leg_overload_coeff)
 		chassis.occupant_message("<span class='danger'>You enable leg actuators overload.</span>")
+		if(istype(chassis.selected, /obj/item/mecha_parts/mecha_equipment/pulse_shield))
+			chassis.occupant_message("<span class='danger'>Your shields turn off as your actuators overload.</span>")
 	else
 		chassis.leg_overload_mode = 0
 		// chassis.bumpsmash = 0
@@ -134,6 +136,7 @@
 		chassis.step_energy_drain = chassis.normal_step_energy_drain
 		chassis.occupant_message("<span class='notice'>You disable leg actuators overload.</span>")
 	build_all_button_icons()
+	chassis.update_icon(UPDATE_OVERLAYS)
 
 /datum/action/innate/mecha/mech_toggle_thrusters
 	name = "Toggle Thrusters"
@@ -253,7 +256,10 @@
 /datum/action/innate/mecha/select_module/Activate()
 	if(!owner || !chassis || chassis.occupant != owner)
 		return
+	if(chassis.selected)
+		chassis.selected.on_unequip()
 	chassis.selected = equipment
+	chassis.selected.on_equip()
 	chassis.occupant_message("<span class='notice'>You switch to [equipment.name].</span>")
 	chassis.visible_message("[chassis] raises [equipment.name]")
 	send_byjax(chassis.occupant, "exosuit.browser", "eq_list", chassis.get_equipment_list())

code/game/mecha/mecha_topic.dm

@@ -257,7 +257,10 @@
 		if(usr != occupant)	return
 		var/obj/item/mecha_parts/mecha_equipment/equip = afilter.getObj("select_equip")
 		if(equip && (equip in equipment))
+			if(selected)
+				selected.on_unequip()
 			selected = equip
+			selected.on_equip()
 			occupant_message("You switch to [equip]")
 			visible_message("[src] raises [equip]")
 			send_byjax(occupant, "exosuit.browser", "eq_list", get_equipment_list())

code/modules/research/designs/mechfabricator_designs.dm

@@ -947,6 +947,17 @@
 	construction_time = 10 SECONDS
 	category = list("Exosuit Equipment")
 
+/datum/design/mech_pulse_shield
+	name = "Exosuit Module (EPS-99 Pulse Shield Generator)"
+	desc = "Exosuit-mounted shield generator."
+	id = "mech_shield_gen"
+	build_type = MECHFAB
+	req_tech = list("bluespace" = 7, "combat" = 7, "engineering"=7)
+	build_path = /obj/item/mecha_parts/mecha_equipment/pulse_shield
+	materials = list(MAT_METAL = 20000, MAT_GOLD = 5000, MAT_BLUESPACE = 5000)
+	construction_time = 10 SECONDS
+	category = list("Exosuit Equipment")
+
 /datum/design/mech_armor_plate
 	name = "Exosuit Mining Armor Plate"
 	desc = "This piece of metal can be attached to the mech itself, enhancing its protective characteristics. Unfortunately, only working class exosuits have notches for such armor."