Ports random parallax layers from /tg/

code/_onclick/hud/parallax.dm

@@ -8,7 +8,7 @@
 	var/last_parallax_shift //world.time of last update
 	var/parallax_throttle = 0 //ds between updates
 	var/parallax_movedir = 0
-	var/parallax_layers_max = 3
+	var/parallax_layers_max = 4
 	var/parallax_animate_timer
 
 /datum/hud/proc/create_parallax(mob/viewmob)
@@ -22,6 +22,8 @@
 		C.parallax_layers_cached += new /obj/screen/parallax_layer/layer_1(null, C.view)
 		C.parallax_layers_cached += new /obj/screen/parallax_layer/layer_2(null, C.view)
 		C.parallax_layers_cached += new /obj/screen/parallax_layer/planet(null, C.view)
+		if(SSparallax.random_layer)
+			C.parallax_layers_cached += new SSparallax.random_layer
 		C.parallax_layers_cached += new /obj/screen/parallax_layer/layer_3(null, C.view)
 
 	C.parallax_layers = C.parallax_layers_cached.Copy()
@@ -64,12 +66,12 @@
 		switch(C.prefs.parallax)
 			if (PARALLAX_INSANE)
 				C.parallax_throttle = FALSE
-				C.parallax_layers_max = 4
+				C.parallax_layers_max = 5
 				return TRUE
 
 			if (PARALLAX_MED)
 				C.parallax_throttle = PARALLAX_DELAY_MED
-				C.parallax_layers_max = 2
+				C.parallax_layers_max = 3
 				return TRUE
 
 			if (PARALLAX_LOW)
@@ -80,8 +82,9 @@
 			if (PARALLAX_DISABLE)
 				return FALSE
 
+	//This is high parallax.
 	C.parallax_throttle = PARALLAX_DELAY_DEFAULT
-	C.parallax_layers_max = 3
+	C.parallax_layers_max = 4
 	return TRUE
 
 /datum/hud/proc/update_parallax_pref(mob/viewmob)
@@ -296,6 +299,20 @@
 	speed = 1.4
 	layer = 3
 
+/obj/screen/parallax_layer/random
+	blend_mode = BLEND_OVERLAY
+	speed = 3
+	layer = 3
+
+/obj/screen/parallax_layer/random/space_gas
+	icon_state = "space gas"
+
+/obj/screen/parallax_layer/random/space_gas/Initialize(mapload, view)
+	src.add_atom_colour(SSparallax.random_parallax_color, ADMIN_COLOUR_PRIORITY)
+
+/obj/screen/parallax_layer/random/asteroids
+	icon_state = "asteroids"
+
 /obj/screen/parallax_layer/planet
 	icon_state = "planet"
 	blend_mode = BLEND_OVERLAY

code/controllers/subsystem/parallax.dm

@@ -7,9 +7,14 @@ SUBSYSTEM_DEF(parallax)
 	var/list/currentrun
 	var/planet_x_offset = 128
 	var/planet_y_offset = 128
+	var/random_layer
+	var/random_parallax_color
 
 /datum/controller/subsystem/parallax/Initialize(timeofday)
 	. = ..()
+	if(prob(70))	//70% chance to pick a special extra layer
+		random_layer = pick(/obj/screen/parallax_layer/random/space_gas, /obj/screen/parallax_layer/random/asteroids)
+		random_parallax_color = pick(COLOR_TEAL, COLOR_GREEN, COLOR_SILVER, COLOR_YELLOW, COLOR_CYAN, COLOR_ORANGE, COLOR_PURPLE)//Special color for random_layer1. Has to be done here so everyone sees the same color.
 	planet_y_offset = rand(100, 160)
 	planet_x_offset = rand(100, 160)