Falling Falcons: Paratroopers Edition (#6150)

# About the pull request
Replaces rappel system with paradrop system. You need a parachute on
your back to paradrop (successfully). You also can drop objects from the
above, but in most cases it's not a great idea (they can break). Crates
can be paradropped too, so this can be an interesting alternative to req
drops. In order for marines to paradrop, PO needs to choose a flare on
the console and lock the paradrop system to the signal. After that the
aft hatch will be open and you are free to jump! Just don't forget the
parachute. (SGs can wear parachutes with armor)

Credits to @SubjectD9341 for the sprites.

# Explain why it's good for the game
It's cooler than rappel.

# Testing Photographs and Procedure
<details>


https://github.com/cmss13-devs/cmss13/assets/115417687/53ec9ddb-5ff5-4af2-9df5-17835e5bc2bc


https://github.com/cmss13-devs/cmss13/assets/115417687/f296c1c7-1cfe-4f8f-89c0-233f612d8542


https://github.com/cmss13-devs/cmss13/assets/115417687/579dac1c-9248-4a7c-b0f7-c9466a131335


https://github.com/cmss13-devs/cmss13/assets/115417687/35728d57-7c83-4539-bf84-accb99127ad7

</details>


# Changelog
:cl: ihatethisengine
add: Added paradropping
del: Removed rappeling
/:cl:

---------

Co-authored-by: fira <loyauflorian@gmail.com>
Co-authored-by: Drathek <76988376+Drulikar@users.noreply.github.com>

code/__DEFINES/equipment.dm

@@ -86,6 +86,8 @@
 #define IGNITING_ITEM (1<<13)
 /// Overrides NODROP in some cases (stripping)
 #define FORCEDROP_CONDITIONAL (1<<14)
+/// Overrides smartgunner not being able to wear backpacks
+#define SMARTGUNNER_BACKPACK_OVERRIDE (1<<15)
 //==========================================================================================
 
 

code/datums/supply_packs/gear.dm

@@ -63,3 +63,32 @@
 	containertype = /obj/structure/closet/crate/ammo
 	containername = "fulton recovery device crate"
 	group = "Gear"
+
+/datum/supply_packs/parachute
+	name = "parachute crate (x20)"
+	contains = list(
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+		/obj/item/parachute,
+	)
+	cost = 40
+	containertype = /obj/structure/closet/crate/supply
+	containername = "parachute crate"
+	group = "Gear"

code/game/machinery/computer/dropship_weapons.dm

@@ -453,6 +453,61 @@
 
 			initiate_firemission(user, fm_tag, direction, text2num(offset_x_value), text2num(offset_y_value))
 			return TRUE
+		if("paradrop-lock")
+			var/obj/docking_port/mobile/marine_dropship/linked_shuttle = SSshuttle.getShuttle(shuttle_tag)
+			if(!linked_shuttle)
+				return FALSE
+			if(linked_shuttle.mode != SHUTTLE_CALL)
+				return FALSE
+			if(linked_shuttle.paradrop_signal)
+				clear_locked_turf_and_lock_aft()
+				return TRUE
+			var/datum/cas_signal/sig = get_cas_signal(camera_target_id)
+			if(!sig)
+				to_chat(user, SPAN_WARNING("No signal chosen."))
+				return FALSE
+			var/turf/location = get_turf(sig.signal_loc)
+			var/area/location_area = get_area(location)
+			if(CEILING_IS_PROTECTED(location_area.ceiling, CEILING_PROTECTION_TIER_1))
+				to_chat(user, SPAN_WARNING("Target is obscured."))
+				return FALSE
+			var/equipment_tag = params["equipment_id"]
+			for(var/obj/structure/dropship_equipment/equipment as anything in shuttle.equipments)
+				var/mount_point = equipment.ship_base.attach_id
+				if(mount_point != equipment_tag)
+					continue
+				if(istype(equipment, /obj/structure/dropship_equipment/paradrop_system))
+					var/obj/structure/dropship_equipment/paradrop_system/paradrop_system = equipment
+					if(paradrop_system.system_cooldown > world.time)
+						to_chat(user, SPAN_WARNING("You toggled the system too recently."))
+						return
+					paradrop_system.system_cooldown = world.time + 5 SECONDS
+					paradrop_system.visible_message(SPAN_NOTICE("[equipment] hums as it locks to a signal."))
+					break
+			linked_shuttle.paradrop_signal = sig
+			addtimer(CALLBACK(src, PROC_REF(open_aft_for_paradrop)), 2 SECONDS)
+			RegisterSignal(linked_shuttle.paradrop_signal, COMSIG_PARENT_QDELETING, PROC_REF(clear_locked_turf_and_lock_aft))
+			RegisterSignal(linked_shuttle, COMSIG_SHUTTLE_SETMODE, PROC_REF(clear_locked_turf_and_lock_aft))
+			return TRUE
+
+/obj/structure/machinery/computer/dropship_weapons/proc/open_aft_for_paradrop()
+	var/obj/docking_port/mobile/marine_dropship/shuttle = SSshuttle.getShuttle(shuttle_tag)
+	if(!shuttle || !shuttle.paradrop_signal || shuttle.mode != SHUTTLE_CALL)
+		return
+	shuttle.door_control.control_doors("force-unlock", "aft", TRUE)
+
+/obj/structure/machinery/computer/dropship_weapons/proc/clear_locked_turf_and_lock_aft()
+	SIGNAL_HANDLER
+	var/obj/docking_port/mobile/marine_dropship/shuttle = SSshuttle.getShuttle(shuttle_tag)
+	if(!shuttle)
+		return
+	shuttle.door_control.control_doors("force-lock", "aft", TRUE)
+	visible_message(SPAN_WARNING("[src] displays an alert as it loses the paradrop target."))
+	for(var/obj/structure/dropship_equipment/paradrop_system/parad in shuttle.equipments)
+		parad.visible_message(SPAN_WARNING("[parad] displays an alert as it loses the paradrop target."))
+	UnregisterSignal(shuttle.paradrop_signal, COMSIG_PARENT_QDELETING)
+	UnregisterSignal(shuttle, COMSIG_SHUTTLE_SETMODE)
+	shuttle.paradrop_signal = null
 
 /obj/structure/machinery/computer/dropship_weapons/proc/get_weapon(eqp_tag)
 	var/obj/docking_port/mobile/marine_dropship/dropship = SSshuttle.getShuttle(shuttle_tag)

code/game/machinery/doors/multi_tile.dm

@@ -279,8 +279,8 @@
 		return
 	..()
 
-/obj/structure/machinery/door/airlock/multi_tile/almayer/dropshiprear/unlock()
-	if(is_reserved_level(z))
+/obj/structure/machinery/door/airlock/multi_tile/almayer/dropshiprear/unlock(forced=FALSE)
+	if(is_reserved_level(z) && !forced)
 		return // in orbit
 	..()
 
@@ -294,6 +294,9 @@
 	if(xeno.action_busy)
 		return
 
+	if(is_reserved_level(z)) //no prying in space even though it's funny
+		return
+
 	var/direction
 	switch(id)
 		if("starboard_door")

code/game/machinery/vending/vendor_types/requisitions.dm

@@ -77,6 +77,7 @@
 		list("Technician Welder-Satchel", round(scale * 5), /obj/item/storage/backpack/marine/engineerpack/satchel, VENDOR_ITEM_REGULAR),
 		list("IMP Ammo Rack", round(scale * 2), /obj/item/storage/backpack/marine/ammo_rack, VENDOR_ITEM_REGULAR),
 		list("Radio Telephone Pack", round(scale * 2), /obj/item/storage/backpack/marine/satchel/rto, VENDOR_ITEM_REGULAR),
+		list("Parachute", round(scale * 20), /obj/item/parachute, VENDOR_ITEM_REGULAR),
 
 		list("BELTS", -1, null, null),
 		list("G8-A General Utility Pouch", round(scale * 2), /obj/item/storage/backpack/general_belt, VENDOR_ITEM_REGULAR),
@@ -89,7 +90,6 @@
 		list("M276 M82F Holster Rig", round(scale * 2), /obj/item/storage/belt/gun/flaregun, VENDOR_ITEM_REGULAR),
 		list("M276 Shotgun Shell Loading Rig", round(scale * 10), /obj/item/storage/belt/shotgun, VENDOR_ITEM_REGULAR),
 		list("M276 Mortar Operator Belt", round(scale * 2), /obj/item/storage/belt/gun/mortarbelt, VENDOR_ITEM_REGULAR),
-		list("Rappel Harness", round(scale * 20), /obj/item/rappel_harness, VENDOR_ITEM_REGULAR),
 
 		list("POUCHES", -1, null, null),
 		list("Autoinjector Pouch", round(scale * 1), /obj/item/storage/pouch/autoinjector, VENDOR_ITEM_REGULAR),

code/game/objects/items/misc.dm

@@ -292,11 +292,12 @@
 	new /obj/item/evidencebag(src)
 	new /obj/item/evidencebag(src)
 
-/obj/item/rappel_harness
-	name = "rappel harness"
-	desc = "A simple, uncomfortable rappel harness with just enough safety straps to make RnD pass health and safety. It comes with an in-built descender, but has no pouches for ammunition."
-	icon = 'icons/obj/items/clothing/belts.dmi'
-	icon_state = "rappel_harness"
-	item_state = "rappel_harness"
+/obj/item/parachute
+	name = "parachute"
+	desc = "A surprisingly small yet bulky pack with just enough safety straps to make RnD pass health and safety. The label says the pack comes with two parachutes - main and reserve, but you doubt the pack can fit even one."
+	icon = 'icons/obj/items/clothing/backpacks.dmi'
+	icon_state = "parachute_pack"
+	item_state = "parachute_pack"
 	w_class = SIZE_MASSIVE
-	flags_equip_slot = SLOT_WAIST
+	flags_equip_slot = SLOT_BACK
+	flags_item = SMARTGUNNER_BACKPACK_OVERRIDE

code/game/turfs/transit.dm

@@ -11,7 +11,7 @@
 	if(isobserver(crosser) || crosser.anchored)
 		return
 
-	if(!isitem(crosser) && !isliving(crosser))
+	if(!isobj(crosser) && !isliving(crosser))
 		return
 
 	if(!istype(old_loc, /turf/open/space))
@@ -24,6 +24,8 @@
 /turf/open/space/transit/proc/handle_crosser(atom/movable/crosser)
 	if(QDELETED(crosser))
 		return
+	if(crosser.can_paradrop()) //let's not delete people who arent meant to be deleted... This shouldn't happen normally, but if it does, congratulations, you gamed the system
+		return
 	qdel(crosser)
 
 /turf/open/space/transit/dropship
@@ -39,14 +41,42 @@
 	if(!istype(dropship) || dropship.mode != SHUTTLE_CALL)
 		return ..()
 
-	if(dropship.destination.id != DROPSHIP_LZ1 && dropship.destination.id != DROPSHIP_LZ2)
-		return ..() // we're not heading towards the LZs
-
 	// you just jumped out of a dropship heading towards the LZ, have fun living on the way down!
 	var/list/ground_z_levels = SSmapping.levels_by_trait(ZTRAIT_GROUND)
 	if(!length(ground_z_levels))
 		return ..()
 
+	if(dropship.paradrop_signal) //if dropship in paradrop mode, drop them near the signal. Whether they have a parachute or not
+		var/list/valid_turfs = list()
+		var/turf/location = get_turf(dropship.paradrop_signal.signal_loc)
+		for(var/turf/turf as anything in RANGE_TURFS(crosser.get_paradrop_scatter(), location))
+			var/area/turf_area = get_area(turf)
+			if(!turf_area || CEILING_IS_PROTECTED(turf_area.ceiling, CEILING_PROTECTION_TIER_1))
+				continue
+			if(turf.density)
+				continue
+			var/found_dense = FALSE
+			for(var/atom/turf_atom in turf)
+				if(turf_atom.density && turf_atom.can_block_movement)
+					found_dense = TRUE
+					break
+			if(found_dense)
+				continue
+			if(protected_by_pylon(TURF_PROTECTION_MORTAR, turf))
+				continue
+			valid_turfs += turf
+		var/turf/deploy_turf
+		if(length(valid_turfs)) //if we found a fitting place near the landing zone...
+			deploy_turf = pick(valid_turfs)
+		else //if we somehow did not. Drop them right on the signal then, there is nothing we can do
+			deploy_turf = location
+		if(crosser.can_paradrop())
+			INVOKE_ASYNC(crosser, TYPE_PROC_REF(/atom/movable, handle_paradrop), deploy_turf, dropship.name)
+			return
+		INVOKE_ASYNC(crosser, TYPE_PROC_REF(/atom/movable, handle_airdrop), deploy_turf, dropship.name)
+		return
+
+	//find a random spot to drop them
 	var/list/area/potential_areas = shuffle(SSmapping.areas_in_z["[ground_z_levels[1]]"])
 
 	for(var/area/maybe_this_area in potential_areas)
@@ -67,53 +97,141 @@
 			continue // couldnt find one in 10 loops, check another area
 
 		// we found a good turf, lets drop em
-		INVOKE_ASYNC(src, PROC_REF(handle_drop), crosser, possible_turf, dropship.name)
+		if(crosser.can_paradrop())
+			INVOKE_ASYNC(crosser, TYPE_PROC_REF(/atom/movable, handle_paradrop), possible_turf, dropship.name)
+			return
+		INVOKE_ASYNC(crosser, TYPE_PROC_REF(/atom/movable, handle_airdrop), possible_turf, dropship.name)
 		return
 
+	//we didn't find a turf to drop them... This shouldn't happen usually
+	if(crosser.can_paradrop()) //don't delete them if they were supposed to paradrop
+		to_chat(crosser, SPAN_BOLDWARNING("Your harness got stuck and you got thrown back in the dropship."))
+		var/turf/projected = get_ranged_target_turf(crosser.loc, turn(dir, 180), 15)
+		INVOKE_ASYNC(crosser, TYPE_PROC_REF(/atom/movable, throw_atom), projected, 50, SPEED_FAST, null, TRUE)
+		return
 	return ..() // they couldn't be dropped, just delete them
 
-/turf/open/space/transit/dropship/proc/handle_drop(atom/movable/crosser, turf/target, dropship_name)
-	if(QDELETED(crosser))
-		return
-	ADD_TRAIT(crosser, TRAIT_IMMOBILIZED, TRAIT_SOURCE_DROPSHIP_INTERACTION)
+/atom/movable/proc/can_paradrop()
+	return FALSE
+
+/atom/movable/proc/get_paradrop_scatter()
+	return 7
+
+/mob/living/carbon/human/can_paradrop()
+	if(istype(back, /obj/item/parachute))
+		return TRUE
+	return ..()
+
+/obj/structure/closet/crate/can_paradrop() //for now all crates can be paradropped
+	return TRUE
+
+/obj/structure/closet/crate/get_paradrop_scatter() //crates land closer to the signal
+	return 4
 
-	crosser.pixel_z = 360
-	crosser.forceMove(target)
-	crosser.visible_message(SPAN_WARNING("[crosser] falls out of the sky."), SPAN_HIGHDANGER("As you fall out of the [dropship_name], you plummet towards the ground."))
-	animate(crosser, time = 6, pixel_z = 0, flags = ANIMATION_PARALLEL)
+/obj/structure/largecrate/can_paradrop()
+	return TRUE
 
-	REMOVE_TRAIT(crosser, TRAIT_IMMOBILIZED, TRAIT_SOURCE_DROPSHIP_INTERACTION)
-	if(isitem(crosser))
-		var/obj/item/item = crosser
-		item.explosion_throw(200) // give it a bit of a kick
+/obj/structure/largecrate/get_paradrop_scatter()
+	return 4
+
+/atom/movable/proc/handle_paradrop(turf/target, dropship_name)
+	clear_active_explosives()
+	ADD_TRAIT(src, TRAIT_IMMOBILIZED, TRAIT_SOURCE_DROPSHIP_INTERACTION)
+	ADD_TRAIT(src, TRAIT_UNDENSE, TRAIT_SOURCE_DROPSHIP_INTERACTION)
+	var/image/cables = image('icons/obj/structures/droppod_32x64.dmi', src, "chute_cables_static")
+	overlays += cables
+	var/image/chute = image('icons/obj/structures/droppod_64x64.dmi', src, "chute_static")
+
+	chute.pixel_x -= 16
+	chute.pixel_y += 16
+
+	overlays += chute
+	pixel_z = 360
+	forceMove(target)
+	playsound(src, 'sound/items/fulton.ogg', 30, 1)
+	animate(src, time = 3.5 SECONDS, pixel_z = 0, flags = ANIMATION_PARALLEL)
+	addtimer(CALLBACK(target, TYPE_PROC_REF(/turf, ceiling_debris)), 2 SECONDS)
+	addtimer(CALLBACK(src, PROC_REF(clear_parachute), cables, chute), 3.5 SECONDS)
+
+/mob/living/carbon/handle_paradrop(turf/target, dropship_name)
+	..()
+	if(client)
+		playsound_client(client, 'sound/items/fulton.ogg', src, 50, 1) //for some reason you don't hear the sound while dropping, maybe because of force move?
+
+/atom/movable/proc/clear_parachute(image/cables, image/chute)
+	if(QDELETED(src))
 		return
+	REMOVE_TRAIT(src, TRAIT_IMMOBILIZED, TRAIT_SOURCE_DROPSHIP_INTERACTION)
+	REMOVE_TRAIT(src, TRAIT_UNDENSE, TRAIT_SOURCE_DROPSHIP_INTERACTION)
+	overlays -= cables
+	overlays -= chute
+
+/atom/movable/proc/clear_active_explosives()
+	for(var/obj/item/explosive/explosive in contents)
+		if(!explosive.active)
+			continue
+		explosive.deconstruct(FALSE)
+
+/atom/movable/proc/handle_airdrop(turf/target, dropship_name)
+	clear_active_explosives()
+	ADD_TRAIT(src, TRAIT_IMMOBILIZED, TRAIT_SOURCE_DROPSHIP_INTERACTION)
+	pixel_z = 360
+	forceMove(target)
+	animate(src, time = 6, pixel_z = 0, flags = ANIMATION_PARALLEL)
+	INVOKE_ASYNC(target, TYPE_PROC_REF(/turf, ceiling_debris))
+	REMOVE_TRAIT(src, TRAIT_IMMOBILIZED, TRAIT_SOURCE_DROPSHIP_INTERACTION)
+
+/obj/handle_airdrop(turf/target, dropship_name)
+	..()
+	if(!indestructible && prob(30)) // throwing objects from the air is not always a good idea
+		deconstruct(FALSE)
+
+/obj/structure/closet/handle_airdrop(turf/target, dropship_name) // good idea but no
+	if(!opened)
+		for(var/atom/movable/content in src)
+			INVOKE_ASYNC(content, TYPE_PROC_REF(/atom/movable, handle_airdrop), target, dropship_name)
+		open()
+	. = ..()
 
-	if(!isliving(crosser))
-		return // don't know how you got here, but you shouldnt be here.
-	var/mob/living/fallen_mob = crosser
+/obj/item/handle_airdrop(turf/target, dropship_name)
+	..()
+	if(QDELETED(src))
+		return
+	if(!indestructible && w_class < SIZE_MEDIUM) //tiny and small items will be lost, good riddance
+		deconstruct(FALSE)
+		return
+	explosion_throw(200) // give it a bit of a kick
+
+/obj/item/explosive/handle_airdrop(turf/target, dropship_name)
+	if(active)
+		deconstruct(FALSE)
+		return
+	..()
 
+/mob/living/handle_airdrop(turf/target, dropship_name)
+	..()
 	playsound(target, "punch", rand(20, 70), TRUE)
 	playsound(target, "punch", rand(20, 70), TRUE)
 	playsound(target, "bone_break", rand(20, 70), TRUE)
 	playsound(target, "bone_break", rand(20, 70), TRUE)
 
-	fallen_mob.KnockDown(10) // 10 seconds
-	fallen_mob.Stun(3) // 3 seconds
-
-
-	if(ishuman(fallen_mob))
-		var/mob/living/carbon/human/human = fallen_mob
-		human.last_damage_data = create_cause_data("falling from [dropship_name]", human)
-		// I'd say falling from space is pretty much like getting hit by an explosion
-		human.take_overall_armored_damage(300, ARMOR_BOMB, limb_damage_chance = 100)
-		// but just in case, you will still take a ton of damage.
-		human.take_overall_damage(200, used_weapon = "falling", limb_damage_chance = 100)
-		if(human.stat != DEAD)
-			human.death(human.last_damage_data)
-		fallen_mob.status_flags |= PERMANENTLY_DEAD
-		return
+	KnockDown(10)
+	Stun(3)
 	// take a little bit more damage otherwise
-	fallen_mob.take_overall_damage(400, used_weapon = "falling", limb_damage_chance = 100)
+	take_overall_damage(400, used_weapon = "falling", limb_damage_chance = 100)
+	visible_message(SPAN_WARNING("[src] falls out of the sky."), SPAN_HIGHDANGER("As you fall out of the [dropship_name], you plummet towards the ground."))
+
+/mob/living/carbon/human/handle_airdrop(turf/target, dropship_name)
+	..()
+	last_damage_data = create_cause_data("falling from [dropship_name]", src)
+	// I'd say falling from space is pretty much like getting hit by an explosion
+	take_overall_armored_damage(300, ARMOR_BOMB, limb_damage_chance = 100)
+	// but just in case, you will still take a ton of damage.
+	take_overall_damage(200, used_weapon = "falling", limb_damage_chance = 100)
+	if(stat < DEAD)
+		death(last_damage_data)
+	status_flags |= PERMANENTLY_DEAD
+
 
 /turf/open/space/transit/dropship/alamo
 	shuttle_tag = DROPSHIP_ALAMO