Revert "Revert "Adds glass floors" (#16524)"

This reverts commit 517f5e8304.

code/game/objects/items/devices/painter/pipe_painter.dm

@@ -27,8 +27,8 @@
 		return
 
 	var/turf/T = get_turf(P)
-	if(P.level < 2 && T.level == 1 && T.intact)
-		to_chat(user, "<span class='warning'>You must remove the plating first.</span>")
+	if(P.level < 2 && T.level == 1 && T.intact && !T.transparent_floor)
+		to_chat(user, "<span class='warning'>You must remove the flooring first.</span>")
 		return
 
 	P.change_color(GLOB.pipe_colors[paint_setting])

code/game/objects/obj_defense.dm

@@ -90,7 +90,7 @@
 /obj/blob_act(obj/structure/blob/B)
 	if(isturf(loc))
 		var/turf/T = loc
-		if(T.intact && level == 1) //the blob doesn't destroy thing below the floor
+		if(T.intact && level == 1 || T.transparent_floor) //the blob doesn't destroy thing below the floor
 			return
 	take_damage(400, BRUTE, "melee", 0, get_dir(src, B))
 
@@ -199,7 +199,7 @@ GLOBAL_DATUM_INIT(acid_overlay, /mutable_appearance, mutable_appearance('icons/e
 /obj/fire_act(datum/gas_mixture/air, exposed_temperature, exposed_volume, global_overlay = TRUE)
 	if(isturf(loc))
 		var/turf/T = loc
-		if(T.intact && level == 1) //fire can't damage things hidden below the floor.
+		if(T.intact && level == 1 || T.transparent_floor) //fire can't damage things hidden below the floor.
 			return
 	..()
 	if(exposed_temperature && !(resistance_flags & FIRE_PROOF))

code/game/objects/structures/safe.dm

@@ -368,7 +368,8 @@ GLOBAL_LIST_EMPTY(safes)
 /obj/structure/safe/floor/Initialize()
 	. = ..()
 	var/turf/T = loc
-	hide(T.intact)
+	if(!T.transparent_floor)
+		hide(T.intact)
 
 /obj/structure/safe/floor/hide(intact)
 	invisibility = intact ? INVISIBILITY_MAXIMUM : 0