Adds Asteroid Cracks

Adds a new type of turf, which is a cracked asteroid floor.  It is functionally a space tile, which means air can escape through the cracks and into the void.  These cracks can be plugged by building a floor over them using rods and tiles.  The cracks are generated randomly along with the asteroid whenever a floor is placed, with a 1 in 10 chance of it being a cracked floor.

code/game/turfs/space/cracked_asteroid.dm

@@ -0,0 +1,16 @@
+// This is used to have vacuums inside the asteroid be more present.
+
+/turf/space/cracked_asteroid
+	icon = 'icons/turf/flooring/asteroid.dmi'
+	name = "cracked sand"
+	desc = "Rough sand with a huge crack.  It probably leads out into the void."
+	icon_state = "asteroid_cracked"
+	dynamic_lighting = TRUE
+
+/turf/space/cracked_asteroid/is_space() // So people don't start floating when standing on it.
+	return FALSE
+
+/turf/space/cracked_asteroid/New()
+	..()
+	spawn(2 SECONDS)
+		overlays.Cut()

code/game/turfs/space/space.dm

@@ -9,7 +9,7 @@
 //	heat_capacity = 700000 No.
 
 /turf/space/New()
-	if(!istype(src, /turf/space/transit))
+	if(!istype(src, /turf/space/transit) && !istype(src, /turf/space/cracked_asteroid))
 		icon_state = "[((x + y) ^ ~(x * y) + z) % 25]"
 	update_starlight()
 	..()

code/modules/mining/mine_turfs.dm

@@ -139,7 +139,7 @@ var/list/mining_overlay_cache = list()
 			overlays += mining_overlay_cache["dug_overlay"]
 
 		for(var/direction in cardinal)
-			if(istype(get_step(src, direction), /turf/space))
+			if(istype(get_step(src, direction), /turf/space) && !istype(get_step(src, direction), /turf/space/cracked_asteroid))
 				if(!mining_overlay_cache["asteroid_edge_[direction]"])
 					mining_overlay_cache["asteroid_edge_[direction]"] = image('icons/turf/flooring/asteroid.dmi', "asteroid_edges", dir = direction)
 				overlays += mining_overlay_cache["asteroid_edge_[direction]"]

code/modules/random_map/automata/caves.dm

@@ -45,7 +45,10 @@
 	var/turf/simulated/mineral/T = locate((origin_x-1)+x,(origin_y-1)+y,origin_z)
 	if(istype(T) && !T.ignore_mapgen)
 		if(map[current_cell] == FLOOR_CHAR)
-			T.make_floor()
+			if(prob(90))
+				T.make_floor()
+			else
+				T.ChangeTurf(/turf/space/cracked_asteroid)
 		else
 			T.make_wall()
 			if(map[current_cell] == DOOR_CHAR)

polaris.dme

@@ -994,6 +994,7 @@
 #include "code\game\turfs\simulated\wall_types.dm"
 #include "code\game\turfs\simulated\walls.dm"
 #include "code\game\turfs\snow\snow.dm"
+#include "code\game\turfs\space\cracked_asteroid.dm"
 #include "code\game\turfs\space\space.dm"
 #include "code\game\turfs\space\transit.dm"
 #include "code\game\turfs\unsimulated\beach.dm"