Merge pull request #5423 from Anewbe/dirt_floors

Implements ways to make floors not get dirty

code/game/turfs/simulated.dm

@@ -12,6 +12,7 @@
 	nitrogen = MOLES_N2STANDARD
 	var/to_be_destroyed = 0 //Used for fire, if a melting temperature was reached, it will be destroyed
 	var/max_fire_temperature_sustained = 0 //The max temperature of the fire which it was subjected to
+	var/can_dirty = TRUE	// If false, tile never gets dirty
 	var/dirt = 0
 
 // This is not great.
@@ -65,12 +66,13 @@
 	tracks.AddTracks(bloodDNA,comingdir,goingdir,bloodcolor)
 
 /turf/simulated/proc/update_dirt()
-	dirt = min(dirt+1, 101)
-	var/obj/effect/decal/cleanable/dirt/dirtoverlay = locate(/obj/effect/decal/cleanable/dirt, src)
-	if (dirt > 50)
-		if (!dirtoverlay)
-			dirtoverlay = new/obj/effect/decal/cleanable/dirt(src)
-		dirtoverlay.alpha = min((dirt - 50) * 5, 255)
+	if(can_dirty)
+		dirt = min(dirt+1, 101)
+		var/obj/effect/decal/cleanable/dirt/dirtoverlay = locate(/obj/effect/decal/cleanable/dirt, src)
+		if (dirt > 50)
+			if (!dirtoverlay)
+				dirtoverlay = new/obj/effect/decal/cleanable/dirt(src)
+			dirtoverlay.alpha = min((dirt - 50) * 5, 255)
 
 /turf/simulated/Entered(atom/A, atom/OL)
 	if(movement_disabled && usr.ckey != movement_disabled_exception)
@@ -82,8 +84,9 @@
 		if(M.lying)
 			return ..()
 
-		// Dirt overlays.
-		update_dirt()
+		if(M.dirties_floor())
+			// Dirt overlays.
+			update_dirt()
 
 		if(istype(M, /mob/living/carbon/human))
 			var/mob/living/carbon/human/H = M

code/modules/mob/living/living.dm

@@ -1277,4 +1277,8 @@ default behaviour is:
 
 
 /mob/living/proc/has_vision()
-	return !(eye_blind || (disabilities & BLIND) || stat || blinded)
+	return !(eye_blind || (disabilities & BLIND) || stat || blinded)
+
+
+/mob/living/proc/dirties_floor()	// If we ever decide to add fancy conditionals for making dirty floors (floating, etc), here's the proc.
+	return makes_dirt

code/modules/mob/living/living_defines.dm

@@ -16,7 +16,6 @@
 	var/brainloss = 0	//'Retardation' damage caused by someone hitting you in the head with a bible or being infected with brainrot.
 	var/halloss = 0		//Hallucination damage. 'Fake' damage obtained through hallucinating or the holodeck. Sleeping should cause it to wear off.
 
-
 	var/hallucination = 0 //Directly affects how long a mob will hallucinate for
 	var/list/atom/hallucinations = list() //A list of hallucinated people that try to attack the mob. See /obj/effect/fake_attacker in hallucinations.dm
 
@@ -59,3 +58,5 @@
 
 	var/list/hud_list		//Holder for health hud, status hud, wanted hud, etc (not like inventory slots)
 	var/has_huds = FALSE	//Whether or not we should bother initializing the above list
+
+	var/makes_dirt = TRUE	//FALSE if the mob shouldn't be making dirt on the ground when it walks