Fix multitile door opacity

code/game/machinery/doors/door.dm

@@ -38,9 +38,12 @@
 
 	var/autoset_access = TRUE // Determines whether the door will automatically set its access from the areas surrounding it. Can be used for mapping.
 
-	//Multi-tile doors
+	// Multi-tile doors
 	dir = SOUTH
+	/// Width of the door in tiles.
 	var/width = 1
+	/// layer view blocking fillers for multi-tile doors.
+	var/list/fillers
 
 	//Used for intercepting clicks on our turf. Set 0 to disable click interception
 	var/turf_hand_priority = 3
@@ -73,13 +76,7 @@
 		layer = open_layer
 
 
-	if(width > 1)
-		if(dir in list(EAST, WEST))
-			bound_width = width * world.icon_size
-			bound_height = world.icon_size
-		else
-			bound_width = world.icon_size
-			bound_height = width * world.icon_size
+	update_bounds()
 
 	if (turf_hand_priority)
 		set_extension(src, /datum/extension/turf_hand, turf_hand_priority)
@@ -430,13 +427,19 @@
 	do_animate("opening")
 	icon_state = "door0"
 	set_opacity(0)
+	if(width > 1)
+		set_fillers_opacity(0)
 	sleep(animation_time*0.3)
 	src.set_density(0)
+	if(width > 1)
+		set_fillers_density(0)
 	update_nearby_tiles()
 	sleep(animation_time*0.7)
 	src.layer = open_layer
 	update_icon()
 	set_opacity(0)
+	if(width > 1)
+		set_fillers_opacity(0)
 	operating = 0
 
 	if(autoclose)
@@ -457,12 +460,16 @@
 	do_animate("closing")
 	sleep(animation_time*0.3)
 	src.set_density(1)
+	if(width > 1)
+		set_fillers_density(1)
 	src.layer = closed_layer
 	update_nearby_tiles()
 	sleep(animation_time*0.7)
 	update_icon()
 	if(visible && !glass)
 		set_opacity(1)	//caaaaarn!
+		if(width > 1)
+			set_fillers_opacity(1)
 	operating = 0
 
 	//I shall not add a check every x ticks if a door has closed over some fire.
@@ -501,15 +508,9 @@
 
 /obj/machinery/door/Move(new_loc, new_dir)
 	update_nearby_tiles()
+	update_bounds()
 
 	. = ..()
-	if(width > 1)
-		if(dir in list(EAST, WEST))
-			bound_width = width * world.icon_size
-			bound_height = world.icon_size
-		else
-			bound_width = world.icon_size
-			bound_height = width * world.icon_size
 
 	if(.)
 		deconstruct(null, TRUE)
@@ -592,6 +593,67 @@
 		toggle()
 	return TRUE
 
+/**
+ * Checks which way the airlock is facing and adjusts the direction accordingly.
+ * For use with multi-tile airlocks.
+ */
+/obj/machinery/door/proc/get_adjusted_dir(dir)
+	if(dir in list(NORTH, SOUTH))
+		return EAST
+	else
+		return NORTH
+
+/**
+ * Sets the bounds of the airlock. For use with multi-tile airlocks.
+ * If the airlock is multi-tile, it will set the bounds to be the size of the airlock.
+ * If the airlock doesn't already have fillers, it will create them.
+ * If the airlock already has fillers, it will move them to the correct location.
+ */
+/obj/machinery/door/proc/update_bounds()
+	if(width <= 1)
+		return
+
+	if(dir in list(NORTH, SOUTH))
+		bound_width = width * world.icon_size
+		bound_height = world.icon_size
+	else
+		bound_width = world.icon_size
+		bound_height = width * world.icon_size
+
+	LAZYINITLIST(fillers)
+
+	var/adjusted_dir = get_adjusted_dir(dir)
+	var/obj/last_filler = src
+	for(var/i = 1, i < width, i++)
+		var/obj/airlock_filler_object/filler
+
+		if(length(fillers) < i)
+			filler = new
+			filler.pair_airlock(src)
+			fillers.Add(filler)
+		else
+			filler = fillers[i]
+
+		filler.loc = get_step(last_filler, adjusted_dir)
+		filler.density = density
+		filler.set_opacity(opacity)
+
+		last_filler = filler
+
+/obj/machinery/door/proc/set_fillers_density(density)
+	if(!length(fillers))
+		return
+
+	for(var/obj/airlock_filler_object/filler as anything in fillers)
+		filler.density = density
+
+/obj/machinery/door/proc/set_fillers_opacity(opacity)
+	if(!length(fillers))
+		return
+
+	for(var/obj/airlock_filler_object/filler as anything in fillers)
+		filler.set_opacity(opacity)
+
 // Public access
 
 /decl/public_access/public_method/open_door

code/game/machinery/doors/multi_tile.dm

@@ -20,23 +20,6 @@
 	opacity = 1
 	assembly_type = /obj/structure/door_assembly/multi_tile
 
-/obj/machinery/door/airlock/multi_tile/New()
-	..()
-	SetBounds()
-
-/obj/machinery/door/airlock/multi_tile/Move()
-	. = ..()
-	SetBounds()
-
-/obj/machinery/door/airlock/multi_tile/proc/SetBounds()
-	if(dir in list(NORTH, SOUTH))
-		bound_width = width * world.icon_size
-		bound_height = world.icon_size
-	else
-		bound_width = world.icon_size
-		bound_height = width * world.icon_size
-
-
 /obj/machinery/door/airlock/multi_tile/on_update_icon(state=0, override=0)
 	..()
 	if(connections in list(NORTH, SOUTH, NORTH|SOUTH))
@@ -81,6 +64,55 @@
 			dirs |= direction
 	connections = dirs
 
+/obj/airlock_filler_object
+	name = "airlock fluff"
+	desc = "You shouldn't be able to see this fluff!"
+	icon = null
+	icon_state = null
+	density = TRUE
+	opacity = TRUE
+	anchored = TRUE
+	invisibility = INVISIBILITY_MAXIMUM
+	atmos_canpass = CANPASS_DENSITY
+	/// The door/airlock this fluff panel is attached to
+	var/obj/machinery/door/filled_airlock
+
+/obj/airlock_filler_object/Bumped(atom/A)
+	if(isnull(filled_airlock))
+		crash_with("Someone bumped into an airlock filler with no parent airlock specified!")
+	return filled_airlock.Bumped(A)
+
+/obj/airlock_filler_object/Destroy()
+	filled_airlock = null
+	return ..()
+
+/// Multi-tile airlocks pair with a filler panel, if one goes so does the other.
+/obj/airlock_filler_object/proc/pair_airlock(obj/machinery/door/parent_airlock)
+	if(isnull(parent_airlock))
+		crash_with("Attempted to pair an airlock filler with no parent airlock specified!")
+
+	filled_airlock = parent_airlock
+	GLOB.destroyed_event.register(filled_airlock, src, .proc/no_airlock)
+
+/obj/airlock_filler_object/proc/no_airlock()
+	GLOB.destroyed_event.unregister(filled_airlock, src)
+	qdel_self()
+
+/// Multi-tile airlocks (using a filler panel) have special handling for movables with PASS_FLAG_GLASS
+/obj/airlock_filler_object/CanPass(atom/movable/mover, turf/target)
+	. = ..()
+	if(.)
+		return
+
+	if(istype(mover) && mover.checkpass(PASS_FLAG_GLASS))
+		return !opacity
+
+/obj/airlock_filler_object/singularity_act()
+	return
+
+/obj/airlock_filler_object/singularity_pull(S, current_size)
+	return
+
 /obj/machinery/door/airlock/multi_tile/command
 	door_color = COLOR_COMMAND_BLUE
 
@@ -133,7 +165,8 @@
 /obj/machinery/door/airlock/multi_tile/glass
 	name = "Glass Airlock"
 	hitsound = 'sound/effects/Glasshit.ogg'
-	glass = 1
+	glass = TRUE
+	opacity = 0
 
 /obj/machinery/door/airlock/multi_tile/glass/command
 	door_color = COLOR_COMMAND_BLUE