Merge pull request #6676 from Citadel-Station-13/upstream-merge-37406

[MIRROR] Adds (fake) ambient occlusion as a client preference

code/game/area/areas.dm

@@ -7,6 +7,7 @@
 	icon = 'icons/turf/areas.dmi'
 	icon_state = "unknown"
 	layer = AREA_LAYER
+	plane = BLACKNESS_PLANE //Keeping this on the default plane, GAME_PLANE, will make area overlays fail to render on FLOOR_PLANE.
 	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
 	invisibility = INVISIBILITY_LIGHTING
 
@@ -518,4 +519,4 @@ GLOBAL_LIST_EMPTY(teleportlocs)
 
 // A hook so areas can modify the incoming args
 /area/proc/PlaceOnTopReact(list/new_baseturfs, turf/fake_turf_type, flags)
-	return flags
+	return flags

code/game/machinery/ai_slipper.dm

@@ -4,6 +4,7 @@
 	icon = 'icons/obj/device.dmi'
 	icon_state = "ai-slipper0"
 	layer = PROJECTILE_HIT_THRESHHOLD_LAYER
+	plane = FLOOR_PLANE
 	anchored = TRUE
 	max_integrity = 200
 	armor = list("melee" = 50, "bullet" = 20, "laser" = 20, "energy" = 20, "bomb" = 0, "bio" = 0, "rad" = 0, "fire" = 50, "acid" = 30)

code/game/machinery/hologram.dm

@@ -32,6 +32,7 @@ Possible to do for anyone motivated enough:
 	desc = "It's a floor-mounted device for projecting holographic images."
 	icon_state = "holopad0"
 	layer = LOW_OBJ_LAYER
+	plane = FLOOR_PLANE
 	flags_1 = HEAR_1
 	anchored = TRUE
 	use_power = IDLE_POWER_USE
@@ -66,7 +67,7 @@ Possible to do for anyone motivated enough:
 	flags_1 = NODECONSTRUCT_1
 	on_network = FALSE
 	var/proximity_range = 1
-	
+
 /obj/machinery/holopad/tutorial/Initialize(mapload)
 	. = ..()
 	if(proximity_range)
@@ -86,7 +87,7 @@ Possible to do for anyone motivated enough:
 		replay_stop()
 	else if(disk && disk.record)
 		replay_start()
-	
+
 /obj/machinery/holopad/tutorial/HasProximity(atom/movable/AM)
 	if (!isliving(AM))
 		return
@@ -487,7 +488,7 @@ For the other part of the code, check silicon say.dm. Particularly robot talk.*/
 	if(QDELETED(user) || user.incapacitated() || !user.client)
 		return FALSE
 	return TRUE
-		
+
 //Can we display holos there
 //Area check instead of line of sight check because this is a called a lot if AI wants to move around.
 /obj/machinery/holopad/proc/validate_location(turf/T,check_los = FALSE)

code/game/machinery/igniter.dm

@@ -3,6 +3,7 @@
 	desc = "It's useful for igniting plasma."
 	icon = 'icons/obj/stationobjs.dmi'
 	icon_state = "igniter0"
+	plane = FLOOR_PLANE
 	var/id = null
 	var/on = FALSE
 	anchored = TRUE
@@ -12,7 +13,7 @@
 	max_integrity = 300
 	armor = list("melee" = 50, "bullet" = 30, "laser" = 70, "energy" = 50, "bomb" = 20, "bio" = 0, "rad" = 0, "fire" = 100, "acid" = 70)
 	resistance_flags = FIRE_PROOF
-	
+
 /obj/machinery/igniter/on
 	on = TRUE
 	icon_state = "igniter1"

code/game/objects/effects/decals/decal.dm

@@ -1,5 +1,6 @@
 /obj/effect/decal
 	name = "decal"
+	plane = FLOOR_PLANE
 	anchored = TRUE
 	resistance_flags = FIRE_PROOF | UNACIDABLE | ACID_PROOF
 	var/turf_loc_check = TRUE

code/game/objects/structures/lattice.dm

@@ -8,6 +8,7 @@
 	armor = list("melee" = 50, "bullet" = 0, "laser" = 0, "energy" = 0, "bomb" = 0, "bio" = 0, "rad" = 0, "fire" = 80, "acid" = 50)
 	max_integrity = 50
 	layer = LATTICE_LAYER //under pipes
+	plane = FLOOR_PLANE
 	var/number_of_rods = 1
 	canSmoothWith = list(/obj/structure/lattice,
 	/turf/open/floor,

code/game/turfs/open.dm

@@ -1,4 +1,5 @@
 /turf/open
+	plane = FLOOR_PLANE
 	var/slowdown = 0 //negative for faster, positive for slower
 
 	var/mutable_appearance/wet_overlay