add: Experimental lighting perfomance fix (#6238) [testmerge][4c8b3e2]

code/game/area/areas.dm

@@ -10,7 +10,6 @@
 	icon_state = "unknown"
 	layer = AREA_LAYER
 	plane = AREA_PLANE //Keeping this on the default plane, GAME_PLANE, will make area overlays fail to render on FLOOR_PLANE.
-	luminosity = 0
 	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
 	invisibility = INVISIBILITY_LIGHTING
 
@@ -119,17 +118,11 @@
 		base_lighting_color = null
 		static_lighting = TRUE
 
-
-	if(requires_power)
-		luminosity = 0
-	else
+	if(!requires_power)
 		power_light = TRUE
 		power_equip = TRUE
 		power_environ = TRUE
 
-		if(static_lighting)
-			luminosity = 0
-
 	. = ..()
 
 	if(!static_lighting)

code/modules/lighting/lighting_area.dm

@@ -87,7 +87,6 @@ GLOBAL_LIST_INIT_TYPED(fullbright_overlays, /mutable_appearance, list(create_ful
 	add_overlay(lighting_effects[1])
 	var/list/z_offsets = SSmapping.z_level_to_plane_offset
 	for(var/turf/T in src)
-		T.luminosity = 1
 		// This outside loop is EXTREMELY hot because it's run by space tiles. Don't want no part in that
 		// We will only add overlays to turfs not on the first z layer, because that's a significantly lesser portion
 		// And we need to do them separate, or lighting will go fuckey

code/modules/lighting/lighting_object.dm

@@ -42,7 +42,6 @@ GLOBAL_LIST_EMPTY(default_lighting_underlays_by_z)
 		stack_trace("a lighting object was assigned to a turf that already had a lighting object!")
 
 	affected_turf.lighting_object = src
-	affected_turf.luminosity = 0
 
 	// This path is really hot. this is faster
 	// Really this should be a global var or something, but lets not think about that yes?
@@ -59,7 +58,6 @@ GLOBAL_LIST_EMPTY(default_lighting_underlays_by_z)
 	SSlighting.objects_queue -= src
 	if (isturf(affected_turf))
 		affected_turf.lighting_object = null
-		affected_turf.luminosity = 1
 	affected_turf = null
 	return ..()
 
@@ -109,8 +107,7 @@ GLOBAL_LIST_EMPTY(default_lighting_underlays_by_z)
 			alpha_corner.cache_r, alpha_corner.cache_g, alpha_corner.cache_b, 00,
 			00, 00, 00, 01
 		)
-
-	affected_turf.luminosity = set_luminosity
+
 	SSdemo.mark_turf(affected_turf)
 
 

code/modules/lighting/lighting_source.dm

@@ -273,8 +273,6 @@
 
 	if(source_turf)
 		var/uses_multiz = !!GET_LOWEST_STACK_OFFSET(source_turf.z)
-		var/oldlum = source_turf.luminosity
-		source_turf.luminosity = CEILING(light_range, 1)
 		if(uses_multiz)
 			for(var/turf/T in view(CEILING(light_range, 1), source_turf))
 				if(IS_OPAQUE_TURF(T))
@@ -311,8 +309,6 @@
 				INSERT_CORNERS(corners, T)
 				SSdemo.mark_turf(T)
 
-		source_turf.luminosity = oldlum
-
 	SETUP_CORNERS_CACHE(src)
 
 	var/list/datum/lighting_corner/new_corners = (corners - src.effect_str)