[READY] Multi-Z Openspace visual fixes. (tgstation#49323)

* openspace fixes

* os over os fix

* 512 plugs

* up

* up up

* up up up

* drop 512

* drop 512 in obj

* drop 512 in turf

* drop 512 in mob p1

* drop 512 in mob p2

* drop 512 in openspace

* one backdrop to rule all

code/__DEFINES/layers.dm

@@ -6,6 +6,12 @@
 #define PLANE_SPACE -95
 #define PLANE_SPACE_PARALLAX -90
 
+
+#define OPENSPACE_LAYER 17 //Openspace layer over all
+#define OPENSPACE_PLANE -4 //Openspace plane below all turfs
+#define OPENSPACE_BACKDROP_PLANE -3 //Black square just over openspace plane to guaranteed cover all in openspace turf
+
+
 #define FLOOR_PLANE -2
 #define GAME_PLANE -1
 #define BLACKNESS_PLANE 0 //To keep from conflicts with SEE_BLACKNESS internals
@@ -84,9 +90,6 @@
 #define ABOVE_LIGHTING_PLANE 16
 #define ABOVE_LIGHTING_LAYER 16
 
-#define FLOOR_OPENSPACE_PLANE 17
-#define OPENSPACE_LAYER 17
-
 #define BYOND_LIGHTING_PLANE 18
 #define BYOND_LIGHTING_LAYER 18
 

code/_onclick/hud/plane_master.dm

@@ -18,7 +18,7 @@
 
 /obj/screen/plane_master/openspace
 	name = "open space plane master"
-	plane = FLOOR_OPENSPACE_PLANE
+	plane = OPENSPACE_BACKDROP_PLANE
 	appearance_flags = PLANE_MASTER
 	blend_mode = BLEND_MULTIPLY
 	alpha = 255

code/game/objects/objs.dm

@@ -33,6 +33,8 @@
 
 	var/drag_slowdown // Amont of multiplicative slowdown applied if pulled. >1 makes you slower, <1 makes you faster.
 
+	vis_flags = VIS_INHERIT_PLANE //when this be added to vis_contents of something it inherit something.plane, important for visualisation of obj in openspace.
+
 /obj/vv_edit_var(vname, vval)
 	switch(vname)
 		if("anchored")
@@ -72,7 +74,6 @@
 		var/turf/T = loc
 		T.add_blueprints_preround(src)
 
-
 /obj/Destroy(force=FALSE)
 	if(!ismachinery(src))
 		STOP_PROCESSING(SSobj, src) // TODO: Have a processing bitflag to reduce on unnecessary loops through the processing lists

code/game/turfs/open/openspace.dm

@@ -1,7 +1,20 @@
+GLOBAL_DATUM_INIT(openspace_backdrop_one_for_all, /atom/movable/openspace_backdrop, new)
+
+/atom/movable/openspace_backdrop
+	name			= "openspace_backdrop"
+
+	anchored		= TRUE
+
+	icon            = 'icons/turf/floors.dmi'
+	icon_state      = "grey"
+	plane           = OPENSPACE_BACKDROP_PLANE
+	mouse_opacity 	= MOUSE_OPACITY_TRANSPARENT
+	layer           = SPLASHSCREEN_LAYER
+
 /turf/open/openspace
 	name = "open space"
 	desc = "Watch your step!"
-	icon_state = "grey"
+	icon_state = "transparent"
 	baseturfs = /turf/open/openspace
 	CanAtmosPassVertical = ATMOS_PASS_YES
 	//mouse_opacity = MOUSE_OPACITY_TRANSPARENT
@@ -14,8 +27,11 @@
 
 /turf/open/openspace/Initialize() // handle plane and layer here so that they don't cover other obs/turfs in Dream Maker
 	. = ..()
-	plane = FLOOR_OPENSPACE_PLANE
+	plane = OPENSPACE_PLANE
 	layer = OPENSPACE_LAYER
+
+	vis_contents += GLOB.openspace_backdrop_one_for_all //Special grey square for projecting backdrop darkness filter on it.
+
 	return INITIALIZE_HINT_LATELOAD
 
 /turf/open/openspace/LateInitialize()

code/game/turfs/turf.dm

@@ -33,6 +33,8 @@
 
 	var/tiled_dirt = FALSE // use smooth tiled dirt decal
 
+	vis_flags = VIS_INHERIT_PLANE|VIS_INHERIT_ID	//when this be added to vis_contents of something it inherit something.plane and be associatet with something on clicking, important for visualisation of turf in openspace and interraction with openspace that show you turf.
+
 /turf/vv_edit_var(var_name, new_value)
 	var/static/list/banned_edits = list("x", "y", "z")
 	if(var_name in banned_edits)

code/modules/mob/mob_defines.dm

@@ -208,3 +208,5 @@
 
 	/// Used for tracking last uses of emotes for cooldown purposes
 	var/list/emotes_used
+
+	vis_flags = VIS_INHERIT_PLANE //when this be added to vis_contents of something it inherit something.plane, important for visualisation of mob in openspace.