[MIRROR] Implements usage of the REVERSE_DIR macro throughout the code. [MDB IGNORE] (#22743)

* Implements usage of the REVERSE_DIR macro throughout the code. (#77122) ## About The Pull Request Replaces a ton of `turn(dir, 180)` calls with the aforementioned macro. ## Why It's Good For The Game Afaik, `REVERSE_DIR` was coded to be faster than the classic `turn(dir, 180)` call, being a simple set of binary operations. To sum it up, micro optimization. ## Changelog N/A * Implements usage of the REVERSE_DIR macro throughout the code. --------- Co-authored-by: Ghom <42542238+Ghommie@users.noreply.github.com>
2026-08-27 15:17:01 +01:00 · 2023-07-28 14:32:01 -04:00
parent 5a49aaf8f6
commit 7b4237c692
65 changed files with 108 additions and 111 deletions
@@ -13,6 +13,18 @@
 /// West direction as a string "[8]"
 #define TEXT_WEST "[WEST]"

+//dir macros
+///Returns true if the dir is diagonal, false otherwise
+#define ISDIAGONALDIR(d) (d&(d-1))
+///True if the dir is north or south, false therwise
+#define NSCOMPONENT(d)   (d&(NORTH|SOUTH))
+///True if the dir is east/west, false otherwise
+#define EWCOMPONENT(d)   (d&(EAST|WEST))
+///Flips the dir for north/south directions
+#define NSDIRFLIP(d)     (d^(NORTH|SOUTH))
+///Flips the dir for east/west directions
+#define EWDIRFLIP(d)     (d^(EAST|WEST))
+
 /// Inverse direction, taking into account UP|DOWN if necessary.
 #define REVERSE_DIR(dir) ( ((dir & 85) << 1) | ((dir & 170) >> 1) )

@@ -255,20 +255,6 @@ GLOBAL_LIST_INIT(bitflags, list(1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 204
 // This skillchip is incompatible with other skillchips from the incompatible_category list.
 #define SKILLCHIP_RESTRICTED_CATEGORIES (1<<1)

-//dir macros
-///Returns true if the dir is diagonal, false otherwise
-#define ISDIAGONALDIR(d) (d&(d-1))
-///True if the dir is north or south, false therwise
-#define NSCOMPONENT(d)   (d&(NORTH|SOUTH))
-///True if the dir is east/west, false otherwise
-#define EWCOMPONENT(d)   (d&(EAST|WEST))
-///Flips the dir for north/south directions
-#define NSDIRFLIP(d)     (d^(NORTH|SOUTH))
-///Flips the dir for east/west directions
-#define EWDIRFLIP(d)     (d^(EAST|WEST))
-///Turns the dir by 180 degrees
-#define DIRFLIP(d)       turn(d, 180)
-
 #define MAX_BITFIELD_SIZE 24

 /// 33554431 (2^24 - 1) is the maximum value our bitflags can reach.
@@ -286,7 +272,6 @@ GLOBAL_LIST_INIT(bitflags, list(1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 204
 /// Used to prevent important slowdowns from being abused by drugs like kronkaine
 #define IGNORE_SLOWDOWNS (1<<4)

-
 // Spacevine-related flags
 /// Is the spacevine / flower bud heat resistant
 #define SPACEVINE_HEAT_RESISTANT (1 << 0)
@@ -30,9 +30,9 @@ GLOBAL_LIST_INIT(typecache_powerfailure_safe_areas, typecacheof(/area/station/en
 			if(!checkT)
 				continue
 			checked_turfs[sourceT] |= dir
-			checked_turfs[checkT] |= turn(dir, 180)
+			checked_turfs[checkT] |= REVERSE_DIR(dir)
 			.[sourceT] |= dir
-			.[checkT] |= turn(dir, 180)
+			.[checkT] |= REVERSE_DIR(dir)
 			if(break_if_found[checkT.type] || break_if_found[checkT.loc.type])
 				return FALSE
 			var/static/list/cardinal_cache = list("[NORTH]"=TRUE, "[EAST]"=TRUE, "[SOUTH]"=TRUE, "[WEST]"=TRUE)
@@ -85,7 +85,7 @@ xxx xxx xxx
 	for(var/dir in cardinals)
 		var/left = turn(dir, 90)
 		var/right = turn(dir, -90)
-		var/opposite = turn(dir, 180)
+		var/opposite = REVERSE_DIR(dir)
 		// Need to encode diagonals here because it's possible, even if it is always false
 		var/list/acceptable_adjacents = new /list(largest_dir)
 		// Alright, what directions are acceptable to us
@@ -123,7 +123,7 @@ xxx xxx xxx
 #define CAN_DIAGONAL_SMOOTH(border_obj, target, direction) (\
 	(target.smoothing_flags & SMOOTH_BORDER_OBJECT) ? \
 		GLOB.adjacent_direction_lookup[border_obj.dir][direction + 1]?[target.dir] : \
-		(GLOB.adjacent_direction_lookup[border_obj.dir][direction + 1]) ? turn(direction, 180) : NONE \
+		(GLOB.adjacent_direction_lookup[border_obj.dir][direction + 1]) ? REVERSE_DIR(direction) : NONE \
 	)

 #define DEFAULT_UNDERLAY_ICON 'icons/turf/floors.dmi'
@@ -412,7 +412,7 @@ xxx xxx xxx
 		break set_adj_in_dir; \
 	/// Check that non border objects use to smooth against border objects
 	/// Returns true if the smooth is acceptable, FALSE otherwise
-	#define BITMASK_ON_BORDER_CHECK(target, direction) (!(target.smoothing_flags & SMOOTH_BORDER_OBJECT) || CAN_DIAGONAL_SMOOTH(target, src, turn(direction, 180)))
+	#define BITMASK_ON_BORDER_CHECK(target, direction) (!(target.smoothing_flags & SMOOTH_BORDER_OBJECT) || CAN_DIAGONAL_SMOOTH(target, src, REVERSE_DIR(direction)))

 	#define BORDER_FOUND(target, direction, direction_flag) new_junction |= CAN_DIAGONAL_SMOOTH(src, target, direction)
 	// Border objects require an object as context, so we need a dummy. I'm sorry
@@ -217,7 +217,7 @@
 		for(var/obj/machinery/duct/duct in get_step(parent, direction))
 			if(!(duct.duct_layer & ducting_layer))
 				continue
-			duct.remove_connects(turn(direction, 180))
+			duct.remove_connects(REVERSE_DIR(direction))
 			duct.neighbours.Remove(parent)
 			duct.update_appearance()

@@ -302,7 +302,7 @@
 /datum/component/plumbing/proc/direct_connect(datum/component/plumbing/plumbing, dir)
 	if(!plumbing.active)
 		return
-	var/opposite_dir = turn(dir, 180)
+	var/opposite_dir = REVERSE_DIR(dir)
 	if(plumbing.demand_connects & opposite_dir && supply_connects & dir || plumbing.supply_connects & opposite_dir && demand_connects & dir) //make sure we arent connecting two supplies or demands
 		var/datum/ductnet/net = new()
 		net.add_plumber(src, dir)
@@ -142,11 +142,11 @@
 		var/side_dir = hyperloop.direction - direction

 		if(is_tile_solid(get_step(clinger, side_dir)))
-			hyperloop.direction = direction + turn(side_dir, 180) //We're bumping a wall to the side, so switch to the other side_dir (yes this adds pingpong protocol)
+			hyperloop.direction = direction + REVERSE_DIR(side_dir) //We're bumping a wall to the side, so switch to the other side_dir (yes this adds pingpong protocol)
 		return

 	//Get the directions from the side of our current drift direction (so if we have drift south, get all cardinals and remove north and south, leaving only east and west)
-	var/side_dirs = shuffle(GLOB.cardinals - direction - turn(direction, 180))
+	var/side_dirs = shuffle(GLOB.cardinals - direction - REVERSE_DIR(direction))

 	//We check if one side is solid
 	if(!is_tile_solid(get_step(clinger, side_dirs[1])))
@@ -59,7 +59,7 @@
 				affected_mob.emote("sneeze")
 				to_chat(affected_mob, span_userdanger("You are launched violently backwards by an all-mighty sneeze!"))
 				var/sneeze_distance = rand(2,4) //twice as far as a normal baseball bat strike will fling you
-				var/turf/target = get_ranged_target_turf(affected_mob, turn(affected_mob.dir, 180), sneeze_distance)
+				var/turf/target = get_ranged_target_turf(affected_mob, REVERSE_DIR(affected_mob.dir), sneeze_distance)
 				affected_mob.throw_at(target, sneeze_distance, rand(1,4)) //with the wounds update, sneezing at 7 speed was causing peoples bones to spontaneously explode, turning cartoonish sneezing into a nightmarishly lethal GBS 2.0 outbreak
 			else if(COOLDOWN_FINISHED(src, sneeze_cooldown) || !COOLDOWN_FINISHED(src, sneeze_cooldown) && prob(60) && !off_cooldown_sneezed)
 				affected_mob.emote("sneeze")
@@ -67,7 +67,7 @@
 	if(throwee.anchored && !throw_anchored)
 		return
 	if(throw_distance < 0)
-		throw_dir = turn(throw_dir, 180)
+		throw_dir = REVERSE_DIR(throw_dir)
 		throw_distance *= -1
 	var/atom/throw_target = get_edge_target_turf(throwee, throw_dir)
 	throwee.safe_throw_at(throw_target, throw_distance, 1, thrower, gentle = throw_gentle)
@@ -131,7 +131,7 @@
 /datum/merger/proc/check_turf(turf/location, list/found_turfs, asking_from)
 	var/found_something = FALSE
 	// if asking_from is invalid (like if it's 0), we get a random output. that's bad, let's check for falsyness
-	var/us_to_them = asking_from && turn(asking_from, 180)
+	var/us_to_them = asking_from && REVERSE_DIR(asking_from)

 	if(found_turfs[location])
 		found_turfs[location][MERGE_TURF_PACKET_DIR] |= us_to_them
@@ -90,7 +90,7 @@
 		owner.emote("cough")
 		if(GET_MUTATION_POWER(src) > 1)
 			var/cough_range = GET_MUTATION_POWER(src) * 4
-			var/turf/target = get_ranged_target_turf(owner, turn(owner.dir, 180), cough_range)
+			var/turf/target = get_ranged_target_turf(owner, REVERSE_DIR(owner.dir), cough_range)
 			owner.throw_at(target, cough_range, GET_MUTATION_POWER(src))

 /datum/mutation/human/paranoia
@@ -67,7 +67,7 @@
 	// When casting, throw the caster backwards a few tiles.
 	var/original_dir = living_cast_on.dir
 	living_cast_on.throw_at(
-		get_edge_target_turf(living_cast_on, turn(living_cast_on.dir, 180)),
+		get_edge_target_turf(living_cast_on, REVERSE_DIR(living_cast_on.dir)),
 		range = self_throw_range,
 		speed = 2,
 		gentle = TRUE,
@@ -148,7 +148,7 @@
 		if(WIRE_UNRESTRICTED_EXIT) // Pulse to switch the direction around by 180 degrees (North goes to South, East goes to West, vice-versa)
 			if(!A.unres_sensor) //only works if the "sensor" is installed (a variable that we assign to the door either upon creation of a door with unrestricted directions or if an unrestricted helper is added to a door in mapping)
 				return
-			A.unres_sides = DIRFLIP(A.unres_sides)
+			A.unres_sides = REVERSE_DIR(A.unres_sides)
 			A.update_appearance()

 /obj/machinery/door/airlock/proc/reset_ai_wire()
@@ -1010,7 +1010,7 @@
 */
 /atom/proc/hitby_react(atom/movable/harmed_atom)
 	if(harmed_atom && isturf(harmed_atom.loc))
-		step(harmed_atom, turn(harmed_atom.dir, 180))
+		step(harmed_atom, REVERSE_DIR(harmed_atom.dir))

 ///Handle the atom being slipped over
 /atom/proc/handle_slip(mob/living/carbon/slipped_carbon, knockdown_amount, obj/slipping_object, lube, paralyze, force_drop)
@@ -417,7 +417,7 @@

 /obj/machinery/door/window/unrestricted_side(mob/opener)
 	if(get_turf(opener) == loc)
-		return turn(dir,180) & unres_sides
+		return REVERSE_DIR(dir) & unres_sides
 	return ..()

 /obj/machinery/door/window/try_to_crowbar(obj/item/I, mob/user, forced = FALSE)
@@ -154,7 +154,7 @@ Buildable meters
 	do_a_flip()

 /obj/item/pipe/proc/do_a_flip()
-	setDir(turn(dir, -180))
+	setDir(REVERSE_DIR(dir))

 /obj/item/pipe/trinary/flippable/do_a_flip()
 	setDir(turn(dir, flipped ? 45 : -45))
@@ -368,7 +368,7 @@
 	var/turf/T = loc
 	var/obj/machinery/power/shieldwallgen/G
 	var/steps = 0
-	var/opposite_direction = turn(direction, 180)
+	var/opposite_direction = REVERSE_DIR(direction)

 	for(var/i in 1 to shield_range) //checks out to 8 tiles away for another generator
 		T = get_step(T, direction)
@@ -205,10 +205,10 @@

 		if(user.buckled && isobj(user.buckled) && !user.buckled.anchored)
 			var/obj/B = user.buckled
-			var/movementdirection = turn(direction,180)
+			var/movementdirection = REVERSE_DIR(direction)
 			addtimer(CALLBACK(src, TYPE_PROC_REF(/obj/item/extinguisher, move_chair), B, movementdirection), 1)
 		else
-			user.newtonian_move(turn(direction, 180))
+			user.newtonian_move(REVERSE_DIR(direction))

 		//Get all the turfs that can be shot at
 		var/turf/T = get_turf(target)
@@ -208,7 +208,7 @@
 					return //If we've run out, display message and exit
 			else
 				last = null
-		last = loaded.place_turf(get_turf(src), user, turn(user.dir, 180))
+		last = loaded.place_turf(get_turf(src), user, REVERSE_DIR(user.dir))
 		is_empty(user) //If we've run out, display message
 	update_appearance()

@@ -785,7 +785,7 @@ for further reading, please see: https://github.com/tgstation/tgstation/pull/301
 		angle = 270
 	if(target.dir & turn(target_to_user, 270))
 		angle = 90
-	if(target.dir & turn(target_to_user, 180))
+	if(target.dir & REVERSE_DIR(target_to_user))
 		angle = 180
 	if(target.dir & target_to_user)
 		angle = 360
@@ -28,7 +28,7 @@
 	playsound(src, P.hitsound, 50, TRUE)
 	var/damage
 	if(!QDELETED(src)) //Bullet on_hit effect might have already destroyed this object
-		damage = take_damage(P.damage * P.demolition_mod, P.damage_type, P.armor_flag, 0, turn(P.dir, 180), P.armour_penetration)
+		damage = take_damage(P.damage * P.demolition_mod, P.damage_type, P.armor_flag, 0, REVERSE_DIR(P.dir), P.armour_penetration)
 	if(P.suppressed != SUPPRESSED_VERY)
 		visible_message(span_danger("[src] is hit by \a [P][damage ? "" : ", without leaving a mark"]!"), null, null, COMBAT_MESSAGE_RANGE)

@@ -343,7 +343,7 @@ GLOBAL_LIST_EMPTY(objects_by_id_tag)
 /obj/handle_ricochet(obj/projectile/P)
 	. = ..()
 	if(. && receive_ricochet_damage_coeff)
-		take_damage(P.damage * receive_ricochet_damage_coeff, P.damage_type, P.armor_flag, 0, turn(P.dir, 180), P.armour_penetration) // pass along receive_ricochet_damage_coeff damage to the structure for the ricochet
+		take_damage(P.damage * receive_ricochet_damage_coeff, P.damage_type, P.armor_flag, 0, REVERSE_DIR(P.dir), P.armour_penetration) // pass along receive_ricochet_damage_coeff damage to the structure for the ricochet

 /// Handles exposing an object to reagents.
 /obj/expose_reagents(list/reagents, datum/reagents/source, methods=TOUCH, volume_modifier=1, show_message=TRUE)
@@ -140,7 +140,7 @@ LINEN BINS
 	// double check the canUseTopic args to make sure it's correct
 	if(!istype(user) || !user.can_perform_action(src, NEED_DEXTERITY))
 		return
-	dir = turn(dir, 180)
+	dir = REVERSE_DIR(dir)

 /obj/item/bedsheet/blue
 	icon_state = "sheetblue"
@@ -34,7 +34,7 @@
 /// We're offset back into the wall, account for that
 /obj/structure/fireplace/get_light_offset()
 	var/list/hand_back = ..()
-	var/list/dir_offset = dir2offset(turn(dir, 180))
+	var/list/dir_offset = dir2offset(REVERSE_DIR(dir))
 	hand_back[1] += dir_offset[1] * 0.5
 	hand_back[2] += dir_offset[2] * 0.5
 	return hand_back
@@ -182,7 +182,7 @@
 			tube_dirs = list(NORTH, SOUTH)
 		if(WEST)
 			tube_dirs = list(NORTH, SOUTH)
-	boarding_dir = turn(dir, 180)
+	boarding_dir = REVERSE_DIR(dir)


 /obj/structure/transit_tube/station/flipped
@@ -212,7 +212,7 @@
 			tube_dirs = list(SOUTH)
 		if(WEST)
 			tube_dirs = list(NORTH)
-	boarding_dir = turn(dir, 180)
+	boarding_dir = REVERSE_DIR(dir)

 /obj/structure/transit_tube/station/reverse/flipped
 	icon_state = "closed_terminus1"
@@ -291,7 +291,7 @@
 			tube_dirs = list(SOUTH)
 		if(WEST)
 			tube_dirs = list(NORTH)
-	boarding_dir = turn(dir, 180)
+	boarding_dir = REVERSE_DIR(dir)

 /obj/structure/transit_tube/station/dispenser/reverse/flipped
 	icon_state = "open_terminusdispenser1"
@@ -61,7 +61,7 @@


 /obj/structure/transit_tube/proc/has_entrance(from_dir)
-	from_dir = turn(from_dir, 180)
+	from_dir = REVERSE_DIR(from_dir)

 	for(var/direction in tube_dirs)
 		if(direction == from_dir)
@@ -154,7 +154,7 @@

 	var/obj/structure/transit_tube/TT = locate(/obj/structure/transit_tube) in loc
 	//landed on a turf without transit tube or not in our direction
-	if(!TT || (!(dir in TT.tube_dirs) && !(turn(dir,180) in TT.tube_dirs)))
+	if(!TT || (!(dir in TT.tube_dirs) && !(REVERSE_DIR(dir) in TT.tube_dirs)))
 		outside_tube()

 /obj/structure/transit_tube_pod/proc/outside_tube()
@@ -187,7 +187,7 @@
 	for(var/obj/structure/transit_tube/station/station in loc)
 		if(station.pod_moving)
 			return
-		if(direction == turn(station.boarding_dir,180))
+		if(direction == REVERSE_DIR(station.boarding_dir))
 			if(station.open_status == STATION_TUBE_OPEN)
 				user.forceMove(loc)
 				update_appearance()
@@ -44,7 +44,7 @@
 		return
 	if(!carbon_mob.density)
 		return
-	var/turf/checked_turf = get_step(carbon_mob, turn(carbon_mob.dir, 180))
+	var/turf/checked_turf = get_step(carbon_mob, REVERSE_DIR(carbon_mob.dir))
 	if(checked_turf == src)
 		carbon_mob.start_leaning(src)

@@ -37,7 +37,7 @@
 	SIGNAL_HANDLER

 	if(enterer && !HAS_TRAIT(enterer, TRAIT_HYPERSPACED))
-		enterer.AddComponent(/datum/component/shuttle_cling, turn(dir, 180))
+		enterer.AddComponent(/datum/component/shuttle_cling, REVERSE_DIR(dir))

 /turf/open/space/transit/proc/initialize_drifting_but_from_initialize(atom/movable/location, atom/movable/enterer, mapload)
 	SIGNAL_HANDLER
@@ -142,7 +142,7 @@
 	for (var/S in SSshuttle.stationary_docking_ports)
 		var/obj/docking_port/stationary/SM = S
 		if (SM.shuttle_id == "emergency_home")
-			var/new_dir = turn(SM.dir, 180)
+			var/new_dir = REVERSE_DIR(SM.dir)
 			SM.forceMove(get_ranged_target_turf(SM, new_dir, crash_strength))
 			break

@@ -126,7 +126,7 @@ GLOBAL_LIST_EMPTY(dirty_vars)
 			if(!(locate(/obj/structure/grille) in T))
 				var/window_check = 0
 				for(var/obj/structure/window/W in T)
-					if (W.dir == turn(C1.dir,180) || (W.dir in list(NORTHEAST,SOUTHEAST,NORTHWEST,SOUTHWEST)) )
+					if (W.dir == REVERSE_DIR(C1.dir) || (W.dir in list(NORTHEAST,SOUTHEAST,NORTHWEST,SOUTHWEST)) )
 						window_check = 1
 						break
 				if(!window_check)
@@ -16,7 +16,7 @@
 			initialize_directions = EAST|WEST

 /obj/machinery/atmospherics/components/binary/get_node_connects()
-	return list(turn(dir, 180), dir)
+	return list(REVERSE_DIR(dir), dir)

 /**
 * Used by binary devices to set what the offset will be for each layer, called in update_icon_nopipes()
@@ -468,7 +468,7 @@
 	if(moderator_list[/datum/gas/bz] < (150 / power_level))
 		return
 	var/obj/machinery/hypertorus/corner/picked_corner = pick(corners)
-	picked_corner.loc.fire_nuclear_particle(turn(picked_corner.dir, 180))
+	picked_corner.loc.fire_nuclear_particle(REVERSE_DIR(picked_corner.dir))

 /obj/machinery/atmospherics/components/unary/hypertorus/core/proc/check_lightning_arcs(moderator_list)
 	if(power_level < 4)
@@ -181,7 +181,7 @@

 /obj/machinery/hypertorus/interface/multitool_act(mob/living/user, obj/item/I)
 	. = ..()
-	var/turf/T = get_step(src,turn(dir,180))
+	var/turf/T = get_step(src,REVERSE_DIR(dir))
 	var/obj/machinery/atmospherics/components/unary/hypertorus/core/centre = locate() in T

 	if(!centre || !centre.check_part_connectivity())
@@ -38,7 +38,7 @@
 			corners |= object
 			continue

-		if(get_step(object,turn(object.dir,180)) != loc)
+		if(get_step(object,REVERSE_DIR(object.dir)) != loc)
 			. = FALSE

 		if(istype(object,/obj/machinery/hypertorus/interface))
@@ -53,7 +53,7 @@
 		if(object.panel_open)
 			. = FALSE

-		if(get_step(object,turn(object.dir,180)) != loc)
+		if(get_step(object,REVERSE_DIR(object.dir)) != loc)
 			. = FALSE

 		if(istype(object,/obj/machinery/atmospherics/components/unary/hypertorus/fuel_input))
@@ -101,7 +101,7 @@
 	cut_overlays()
 	var/mutable_appearance/pipe_appearance1 = mutable_appearance('icons/obj/pipes_n_cables/pipe_underlays.dmi', "intact_[dir]_[piping_layer]", layer = GAS_SCRUBBER_LAYER)
 	pipe_appearance1.color = COLOR_LIME
-	var/mutable_appearance/pipe_appearance2 = mutable_appearance('icons/obj/pipes_n_cables/pipe_underlays.dmi', "intact_[turn(dir, 180)]_[piping_layer]", layer = GAS_SCRUBBER_LAYER)
+	var/mutable_appearance/pipe_appearance2 = mutable_appearance('icons/obj/pipes_n_cables/pipe_underlays.dmi', "intact_[REVERSE_DIR(dir)]_[piping_layer]", layer = GAS_SCRUBBER_LAYER)
 	pipe_appearance2.color = COLOR_MOSTLY_PURE_RED
 	. += pipe_appearance1
 	. += pipe_appearance2
@@ -40,13 +40,13 @@ Housekeeping and pipe network stuff
 	//Node 3 is rest output
 	//If we flip the filter, 1 and 3 shall exchange positions

-	var/node1_connect = turn(dir, -180)
+	var/node1_connect = REVERSE_DIR(dir)
 	var/node2_connect = turn(dir, -90)
 	var/node3_connect = dir

 	if(flipped)
-		node1_connect = turn(node1_connect, 180)
-		node3_connect = turn(node3_connect, 180)
+		node1_connect = REVERSE_DIR(node1_connect)
+		node3_connect = REVERSE_DIR(node3_connect)

 	return list(node1_connect, node2_connect, node3_connect)

@@ -38,7 +38,7 @@
 	var/obj/machinery/atmospherics/components/unary/heat_exchanger/partner = partner_ref?.resolve()
 	if(!partner)
 		partner_ref = null
-		var/partner_connect = turn(dir,180)
+		var/partner_connect = REVERSE_DIR(dir)

 		for(var/obj/machinery/atmospherics/components/unary/heat_exchanger/target in get_step(src,partner_connect))
 			if(target.dir & get_dir(src,target))
@@ -23,7 +23,7 @@
 			initialize_directions = WEST|EAST

 /obj/machinery/atmospherics/pipe/heat_exchanging/junction/get_node_connects()
-	return list(turn(dir, 180), dir)
+	return list(REVERSE_DIR(dir), dir)

 /obj/machinery/atmospherics/pipe/heat_exchanging/junction/is_connectable(obj/machinery/atmospherics/target, given_layer, he_type_check)
 	if(dir == get_dir(target, src))
@@ -84,7 +84,7 @@
 	nodes = list()
 	for(var/iter in PIPING_LAYER_MIN to PIPING_LAYER_MAX)
 		var/obj/machinery/atmospherics/foundfront = find_connecting(dir, iter)
-		var/obj/machinery/atmospherics/foundback = find_connecting(turn(dir, 180), iter)
+		var/obj/machinery/atmospherics/foundback = find_connecting(REVERSE_DIR(dir), iter)
 		front_nodes += foundfront
 		back_nodes += foundback
 		if(foundfront && !QDELETED(foundfront))
@@ -48,7 +48,7 @@
 		return

 	if(bananium.use_amount_mat(material_per_banana, /datum/material/bananium))
-		new banana_type(get_step(src, turn(wearer.dir, 180))) //honk
+		new banana_type(get_step(src, REVERSE_DIR(wearer.dir))) //honk
 		return

 	toggle_clowning_action()
@@ -23,7 +23,7 @@

 /datum/round_event/immovable_rod/start()
 	var/startside = pick(GLOB.cardinals)
-	var/turf/end_turf = get_edge_target_turf(get_random_station_turf(), turn(startside, 180))
+	var/turf/end_turf = get_edge_target_turf(get_random_station_turf(), REVERSE_DIR(startside))
 	var/turf/start_turf = spaceDebrisStartLoc(startside, end_turf.z)
 	var/atom/rod = new /obj/effect/immovablerod(start_turf, end_turf, special_target, force_looping)
 	announce_to_ghosts(rod)
@@ -99,7 +99,7 @@
 	// If they don't, we'll make them wrap all the way around to the other side of the grid
 	for(var/direction in GLOB.cardinals)
 		var/dir = "[direction]"
-		var/inverse = "[turn(direction, 180)]"
+		var/inverse = "[REVERSE_DIR(direction)]"
 		for(var/datum/space_level/level as anything in transition_levels)
 			// If we have something in this dir that isn't just us, continue on
 			if(level.neigbours[dir] && level.neigbours[dir] != level)
@@ -404,7 +404,7 @@
 	if((machine_stat & NOPOWER))
 		return
 	var/image/ore_input = image(icon='icons/obj/doors/airlocks/station/overlays.dmi', icon_state="unres_[input_dir]")
-	var/image/ore_output = image(icon='icons/obj/doors/airlocks/station/overlays.dmi', icon_state="unres_[turn(input_dir, 180)]")
+	var/image/ore_output = image(icon='icons/obj/doors/airlocks/station/overlays.dmi', icon_state="unres_[REVERSE_DIR(input_dir)]")

 	switch(input_dir)
 		if(NORTH)
@@ -360,7 +360,7 @@
 				break
 		if(target_turf != target_shove_turf && !directional_blocked) //Make sure that we don't run the exact same check twice on the same tile
 			for(var/obj/obj_content in target_shove_turf)
-				if(obj_content.flags_1 & ON_BORDER_1 && obj_content.dir == turn(shove_dir, 180) && obj_content.density)
+				if(obj_content.flags_1 & ON_BORDER_1 && obj_content.dir == REVERSE_DIR(shove_dir) && obj_content.density)
 					directional_blocked = TRUE
 					break

@@ -1040,7 +1040,7 @@
 		else if(newdir == (EAST|WEST))
 			newdir = EAST
 	if((newdir in GLOB.cardinals) && (prob(50)))
-		newdir = turn(get_dir(target_turf, start), 180)
+		newdir = REVERSE_DIR(get_dir(target_turf, start))
 	if(!blood_exists)
 		new /obj/effect/decal/cleanable/trail_holder(start, get_static_viruses())

@@ -77,15 +77,15 @@
 		var/dir_1 = 0
 		var/dir_2 = 0
 		if(i == 1)
-			dir_2 = turn(angle2dir(get_angle(path[i+1], current_turf)), 180)
+			dir_2 = REVERSE_DIR(angle2dir(get_angle(path[i+1], current_turf)))
 		else if(i == length(path))
-			dir_2 = turn(angle2dir(get_angle(path[i-1], current_turf)), 180)
+			dir_2 = REVERSE_DIR(angle2dir(get_angle(path[i-1], current_turf)))
 		else
-			dir_1 = turn(angle2dir(get_angle(path[i+1], current_turf)), 180)
-			dir_2 = turn(angle2dir(get_angle(path[i-1], current_turf)), 180)
+			dir_1 = REVERSE_DIR(angle2dir(get_angle(path[i+1], current_turf)))
+			dir_2 = REVERSE_DIR(angle2dir(get_angle(path[i-1], current_turf)))
 			if(dir_1 > dir_2)
 				dir_1 = dir_2
-				dir_2 = turn(angle2dir(get_angle(path[i+1], current_turf)), 180)
+				dir_2 = REVERSE_DIR(angle2dir(get_angle(path[i+1], current_turf)))
 		path_image.icon_state = "[dir_1]-[dir_2]"
 		client.images += path_image
 		client.navigation_images += path_image
@@ -165,7 +165,7 @@

 	var/atom/movable/P = mob.pulling
 	if(P && !ismob(P) && P.density)
-		mob.setDir(turn(mob.dir, 180))
+		mob.setDir(REVERSE_DIR(mob.dir))

 /**
 * Checks to see if you're being grabbed and if so attempts to break it
@@ -301,7 +301,7 @@
 	// last pushoff exists for one reason
 	// to ensure pushing a mob doesn't just lead to it considering us as backup, and failing
 	last_pushoff = world.time
-	if(backup.newtonian_move(turn(movement_dir, 180), instant = TRUE)) //You're pushing off something movable, so it moves
+	if(backup.newtonian_move(REVERSE_DIR(movement_dir), instant = TRUE)) //You're pushing off something movable, so it moves
 		// We set it down here so future calls to Process_Spacemove by the same pair in the same tick don't lead to fucky
 		backup.last_pushoff = world.time
 		to_chat(src, span_info("You push off of [backup] to propel yourself."))
@@ -86,7 +86,7 @@ All the important duct code:

 ///connect to a duct
 /obj/machinery/duct/proc/connect_duct(obj/machinery/duct/other, direction)
-	var/opposite_dir = turn(direction, 180)
+	var/opposite_dir = REVERSE_DIR(direction)
 	if(!active || !other.active)
 		return

@@ -128,7 +128,7 @@ All the important duct code:

 ///connect to a plumbing object
 /obj/machinery/duct/proc/connect_plumber(datum/component/plumbing/plumbing, direction)
-	var/opposite_dir = turn(direction, 180)
+	var/opposite_dir = REVERSE_DIR(direction)

 	if(!(duct_layer & plumbing.ducting_layer))
 		return FALSE
@@ -182,7 +182,7 @@ All the important duct code:
 	if(!(other in neighbours))
 		neighbours[other] = direction
 	if(!(src in other.neighbours))
-		other.neighbours[src] = turn(direction, 180)
+		other.neighbours[src] = REVERSE_DIR(direction)

 ///remove all our neighbours, and remove us from our neighbours aswell
 /obj/machinery/duct/proc/lose_neighbours()
@@ -212,7 +212,7 @@ All the important duct code:
 	for(var/direction in GLOB.cardinals)
 		if(direction & connects)
 			for(var/obj/machinery/duct/other in get_step(src, direction))
-				if((turn(direction, 180) & other.connects) && other.active)
+				if((REVERSE_DIR(direction) & other.connects) && other.active)
 					adjacents += other
 	return adjacents

@@ -106,7 +106,7 @@ GLOBAL_LIST_INIT(wire_node_generating_types, typecacheof(list(/obj/structure/gri
 					var/obj/machinery/power/smes/S = locate(/obj/machinery/power/smes) in TB
 					if(S && (!S.terminal || S.terminal == search_parent))
 						continue
-		var/inverse = turn(check_dir, 180)
+		var/inverse = REVERSE_DIR(check_dir)
 		for(var/obj/structure/cable/C in TB)
 			if(C.cable_layer & cable_layer)
 				linked_dirs |= check_dir
@@ -122,7 +122,7 @@ GLOBAL_LIST_INIT(wire_node_generating_types, typecacheof(list(/obj/structure/gri
 ///Clear the linked indicator bitflags
 /obj/structure/cable/proc/Disconnect_cable()
 	for(var/check_dir in GLOB.cardinals)
-		var/inverse = turn(check_dir, 180)
+		var/inverse = REVERSE_DIR(check_dir)
 		if(linked_dirs & check_dir)
 			var/TB = get_step(loc, check_dir)
 			for(var/obj/structure/cable/C in TB)
@@ -274,7 +274,7 @@ GLOBAL_LIST_INIT(wire_node_generating_types, typecacheof(list(/obj/structure/gri
 // merge with the powernets of power objects in the given direction
 /obj/structure/cable/proc/mergeConnectedNetworks(direction)

-	var/inverse_dir = (!direction)? 0 : turn(direction, 180) //flip the direction, to match with the source position on its turf
+	var/inverse_dir = (!direction)? 0 : REVERSE_DIR(direction) //flip the direction, to match with the source position on its turf

 	var/turf/TB = get_step(src, direction)

@@ -112,7 +112,7 @@
 		RegisterSignal(SSdcs, COMSIG_GLOB_GREY_TIDE_LIGHT, PROC_REF(grey_tide)) //Only put the signal on station lights

 	// Light projects out backwards from the dir of the light
-	set_light(l_dir = turn(dir, 180))
+	set_light(l_dir = REVERSE_DIR(dir))
 	RegisterSignal(src, COMSIG_LIGHT_EATER_ACT, PROC_REF(on_light_eater))
 	AddElement(/datum/element/atmos_sensitive, mapload)
 	return INITIALIZE_HINT_LATELOAD
@@ -137,14 +137,14 @@

 /obj/machinery/light/setDir(newdir)
 	. = ..()
-	set_light(l_dir = turn(dir, 180))
+	set_light(l_dir = REVERSE_DIR(dir))

 // If we're adjacent to the source, we make this sorta indentation for our light to ensure it stays lit (and to make distances look right)
 // By shifting the light position we use forward a bit, towards something that isn't off by 0.5 from being in angle
 // Because angle calculation is kinda harsh it's hard to find a happy point between fulldark and fullbright for the corners behind the light. this is good enough tho
 /obj/machinery/light/get_light_offset()
 	var/list/hand_back = ..()
-	var/list/dir_offset = dir2offset(turn(dir, 180))
+	var/list/dir_offset = dir2offset(REVERSE_DIR(dir))
 	hand_back[1] += dir_offset[1] * 0.5
 	hand_back[2] += dir_offset[2] * 0.5
 	return hand_back
@@ -384,7 +384,7 @@ By design, d1 is the smallest direction and d2 is the highest
 			// pipe_cleaner is pointing at us, we're standing on an open tile
 			// so create a stub pointing at the clicked pipe_cleaner on our tile

-			var/fdirn = turn(dirn, 180) // the opposite direction
+			var/fdirn = REVERSE_DIR(dirn) // the opposite direction

 			for(var/obj/structure/pipe_cleaner/LC in U) // check to make sure there's not a pipe_cleaner there already
 				if(LC.d1 == fdirn || LC.d2 == fdirn)
@@ -51,7 +51,7 @@
 		for(var/d in GLOB.cardinals)
 			var/turf/T = get_step(src, d)
 			for(var/obj/machinery/power/terminal/term in T)
-				if(term && term.dir == turn(d, 180))
+				if(term && term.dir == REVERSE_DIR(d))
 					terminal = term
 					break dir_loop

@@ -97,7 +97,7 @@
 		terminal = null
 		var/turf/T = get_step(src, dir)
 		for(var/obj/machinery/power/terminal/term in T)
-			if(term && term.dir == turn(dir, 180))
+			if(term && term.dir == REVERSE_DIR(dir))
 				terminal = term
 				terminal.master = src
 				to_chat(user, span_notice("Terminal found."))
@@ -257,7 +257,7 @@
 	compressor_work = 0
 	compressor_pressure = MINIMUM_TURBINE_PRESSURE
 	if(QDELETED(input_turf))
-		input_turf = get_step(loc, turn(dir, 180))
+		input_turf = get_step(loc, REVERSE_DIR(dir))

 	var/datum/gas_mixture/input_turf_mixture = input_turf.return_air()
 	if(!input_turf_mixture)
@@ -452,19 +452,19 @@

 	//locate compressor & turbine, when checking we simply check to see if they are still there
 	if(!check_only)
-		compressor = locate(/obj/machinery/power/turbine/inlet_compressor) in get_step(src, turn(dir, 180))
+		compressor = locate(/obj/machinery/power/turbine/inlet_compressor) in get_step(src, REVERSE_DIR(dir))
 		turbine = locate(/obj/machinery/power/turbine/turbine_outlet) in get_step(src, dir)

 		//maybe look for them the other way around. we want the rotor to allign with them either way for player convinience
 		if(!compressor && !turbine)
 			compressor = locate(/obj/machinery/power/turbine/inlet_compressor) in get_step(src, dir)
-			turbine = locate(/obj/machinery/power/turbine/turbine_outlet) in get_step(src, turn(dir, 180))
+			turbine = locate(/obj/machinery/power/turbine/turbine_outlet) in get_step(src, REVERSE_DIR(dir))

 	//sanity checks for compressor
 	if(QDELETED(compressor))
 		feedback(user, "missing compressor!")
 		return (all_parts_connected = FALSE)
-	if(compressor.dir != dir && compressor.dir != turn(dir, 180)) //make sure it's not perpendicular to the rotor
+	if(compressor.dir != dir && compressor.dir != REVERSE_DIR(dir)) //make sure it's not perpendicular to the rotor
 		feedback(user, "compressor not aligned with rotor!")
 		return (all_parts_connected = FALSE)
 	if(!compressor.can_connect)
@@ -478,7 +478,7 @@
 	if(QDELETED(turbine))
 		feedback(user, "missing turbine!")
 		return (all_parts_connected = FALSE)
-	if(turbine.dir != dir && turbine.dir != turn(dir, 180))
+	if(turbine.dir != dir && turbine.dir != REVERSE_DIR(dir))
 		feedback(user, "turbine not aligned with rotor!")
 		return (all_parts_connected = FALSE)
 	if(!turbine.can_connect)
@@ -577,7 +577,7 @@
 			var/turf/T = get_turf(user)
 			process_fire(user, user, FALSE, null, BODY_ZONE_HEAD)
 			user.visible_message(span_suicide("[user] blows [user.p_their()] brain[user.p_s()] out with [src]!"))
-			var/turf/target = get_ranged_target_turf(user, turn(user.dir, 180), BRAINS_BLOWN_THROW_RANGE)
+			var/turf/target = get_ranged_target_turf(user, REVERSE_DIR(user.dir), BRAINS_BLOWN_THROW_RANGE)
 			B.Remove(user)
 			B.forceMove(T)
 			var/datum/callback/gibspawner = CALLBACK(GLOBAL_PROC, GLOBAL_PROC_REF(spawn_atom_to_turf), /obj/effect/gibspawner/generic, B, 1, FALSE, user)
@@ -136,7 +136,7 @@ GLOBAL_LIST_EMPTY(conveyors_by_id)
 		if(QDELETED(valid))
 			continue
 		neighbors["[direction]"] = TRUE
-		valid.neighbors["[DIRFLIP(direction)]"] = TRUE
+		valid.neighbors["[REVERSE_DIR(direction)]"] = TRUE
 		RegisterSignal(valid, COMSIG_MOVABLE_MOVED, PROC_REF(nearby_belt_changed), override=TRUE)
 		RegisterSignal(valid, COMSIG_QDELETING, PROC_REF(nearby_belt_changed), override=TRUE)
 		valid.RegisterSignal(src, COMSIG_MOVABLE_MOVED, PROC_REF(nearby_belt_changed), override=TRUE)
@@ -83,7 +83,7 @@
 		if(initialize_dirs & DISP_DIR_RIGHT)
 			dpdir |= turn(dir, -90)
 		if(initialize_dirs & DISP_DIR_FLIP)
-			dpdir |= turn(dir, 180)
+			dpdir |= REVERSE_DIR(dir)
 	return dpdir

 /obj/structure/disposalconstruct/proc/AfterRotation(mob/user, degrees)
@@ -168,7 +168,7 @@
 	if(!T)
 		return null

-	var/fdir = turn(dir, 180) // flip the movement direction
+	var/fdir = REVERSE_DIR(dir) // flip the movement direction
 	for(var/obj/structure/disposalpipe/P in T)
 		if(fdir & P.dpdir) // find pipe direction mask that matches flipped dir
 			if(QDELING(P))
@@ -49,7 +49,7 @@
 		if(initialize_dirs & DISP_DIR_RIGHT)
 			dpdir |= turn(dir, -90)
 		if(initialize_dirs & DISP_DIR_FLIP)
-			dpdir |= turn(dir, 180)
+			dpdir |= REVERSE_DIR(dir)

 	AddElement(/datum/element/undertile, TRAIT_T_RAY_VISIBLE)
 	if(isturf(loc))
@@ -85,7 +85,7 @@
 // returns the direction of the next pipe object, given the entrance dir
 // by default, returns the bitmask of remaining directions
 /obj/structure/disposalpipe/proc/nextdir(obj/structure/disposalholder/H)
-	return dpdir & (~turn(H.dir, 180))
+	return dpdir & (~REVERSE_DIR(H.dir))

 // transfer the holder through this pipe segment
 // overridden for special behaviour
@@ -210,7 +210,7 @@
 // if coming in from secondary dirs, then next is primary dir
 // if coming in from primary dir, then next is equal chance of other dirs
 /obj/structure/disposalpipe/junction/nextdir(obj/structure/disposalholder/H)
-	var/flipdir = turn(H.dir, 180)
+	var/flipdir = REVERSE_DIR(H.dir)
 	if(flipdir != dir) // came from secondary dir, so exit through primary
 		return dir

@@ -7,7 +7,7 @@
 	initialize_dirs = DISP_DIR_RIGHT | DISP_DIR_FLIP

 /obj/structure/disposalpipe/sorting/nextdir(obj/structure/disposalholder/H)
-	var/sortdir = dpdir & ~(dir | turn(dir, 180))
+	var/sortdir = dpdir & ~(dir | REVERSE_DIR(dir))
 	if(H.dir != sortdir) // probably came from the negdir
 		if(check_sorting(H)) // if destination matches filtered type...
 			return sortdir // exit through sortdirection
@@ -86,7 +86,7 @@
 	return TRUE

 /obj/machinery/atmospherics/components/binary/circulator/get_node_connects()
-	return list(turn(dir, 180), dir) // airs[2] is input which is facing dir, airs[1] is output which is facing the other side of dir
+	return list(REVERSE_DIR(dir), dir) // airs[2] is input which is facing dir, airs[1] is output which is facing the other side of dir

 /obj/machinery/atmospherics/components/binary/tank_compressor/screwdriver_act(mob/living/user, obj/item/tool)
 	if(active || inserted_tank)
@@ -263,7 +263,7 @@
 /obj/machinery/atmospherics/components/binary/tank_compressor/update_overlays()
 	. = ..()
 	. += get_pipe_image(icon, "[base_icon_state]-pipe", dir, COLOR_VIBRANT_LIME, piping_layer)
-	. += get_pipe_image(icon, "[base_icon_state]-pipe", turn(dir, 180), COLOR_RED, piping_layer)
+	. += get_pipe_image(icon, "[base_icon_state]-pipe", REVERSE_DIR(dir), COLOR_RED, piping_layer)
 	if(!istype(inserted_tank))
 		. += mutable_appearance(icon, "[base_icon_state]-doors",)
 	if(panel_open)
@@ -49,7 +49,7 @@
 		rotation = SIMPLIFY_DEGREES(rotation)

 	if(!movement_direction)
-		movement_direction = turn(preferred_direction, 180)
+		movement_direction = REVERSE_DIR(preferred_direction)

 	var/list/moved_atoms = list() //Everything not a turf that gets moved in the shuttle
 	var/list/areas_to_move = list() //unique assoc list of areas on turfs being moved
@@ -426,8 +426,8 @@

 /obj/item/mecha_parts/mecha_equipment/thrusters/proc/generate_effect(movement_dir)
 	var/obj/effect/particle_effect/E = new effect_type(get_turf(chassis))
-	E.dir = turn(movement_dir, 180)
-	step(E, turn(movement_dir, 180))
+	E.dir = REVERSE_DIR(movement_dir)
+	step(E, REVERSE_DIR(movement_dir))
 	QDEL_IN(E, 5)


@@ -43,7 +43,7 @@
 /obj/item/mecha_parts/mecha_equipment/weapon/action(mob/source, atom/target, list/modifiers)
 	if(!action_checks(target))
 		return FALSE
-	var/newtonian_target = turn(chassis.dir,180)
+	var/newtonian_target = REVERSE_DIR(chassis.dir)
 	. = ..()//start the cooldown early because of sleeps
 	for(var/i in 1 to projectiles_per_shot)
 		if(energy_drain && !chassis.has_charge(energy_drain))//in case we run out of energy mid-burst, such as emp
@@ -44,7 +44,7 @@
 		if(!istype(backup) || !movement_dir || backup.anchored || continuous_move) //get_spacemove_backup() already checks if a returned turf is solid, so we can just go
 			return TRUE
 		last_pushoff = world.time
-		if(backup.newtonian_move(turn(movement_dir, 180), instant = TRUE))
+		if(backup.newtonian_move(REVERSE_DIR(movement_dir), instant = TRUE))
 			backup.last_pushoff = world.time
 			step_silent = TRUE
 			if(return_drivers())
@@ -115,7 +115,7 @@
 				grinding_mulitipler = 2
 			victim.Knockdown(4 * grinding_mulitipler SECONDS)
 	else
-		var/backdir = turn(dir, 180)
+		var/backdir = REVERSE_DIR(dir)
 		step(src, backdir)
 		rider.spin(4, 1)