Backports several SSlighting improvements: overlay lighting

_maps/RandomRuins/SpaceRuins/bigape.dmm

@@ -31,7 +31,7 @@
 /area/ruin/powered)
 "g" = (
 /obj/item/flashlight/lamp/bananalamp{
-	brightness_on = 10
+	light_range = 10
 	},
 /obj/structure/table/wood,
 /obj/structure/fans/tiny/invisible,

code/__DEFINES/layers.dm

@@ -107,8 +107,12 @@
 #define RAD_TEXT_LAYER 15.1
 
 
-#define ABOVE_LIGHTING_PLANE 16
-#define ABOVE_LIGHTING_LAYER 16
+#define O_LIGHTING_VISUAL_PLANE 16
+#define O_LIGHTING_VISUAL_LAYER 16
+#define O_LIGHTING_VISUAL_RENDER_TARGET "O_LIGHT_VISUAL_PLANE"
+
+#define ABOVE_LIGHTING_PLANE 17
+#define ABOVE_LIGHTING_LAYER 17
 #define ABOVE_LIGHTING_RENDER_TARGET "ABOVE_LIGHTING_PLANE"
 
 #define FLOOR_OPENSPACE_PLANE 17

code/__DEFINES/lighting.dm

@@ -1,3 +1,16 @@
+///Object doesn't use any of the light systems. Should be changed to add a light source to the object.
+#define NO_LIGHT_SUPPORT 0
+///Light made with the lighting datums, applying a matrix.
+#define STATIC_LIGHT 1
+///Light made by masking the lighting darkness plane.
+#define MOVABLE_LIGHT 2
+
+///Is a movable light source attached to another movable (its loc), meaning that the lighting component should go one level deeper.
+#define LIGHT_ATTACHED (1<<0)
+
+///This light doesn't affect turf's lumcount calculations. Set to 1<<15 to ignore conflicts
+#define LIGHT_NO_LUMCOUNT (1<<15)
+
 //Bay lighting engine shit, not in /code/modules/lighting because BYOND is being shit about it
 /// frequency, in 1/10ths of a second, of the lighting process
 #define LIGHTING_INTERVAL       5

code/__DEFINES/machines.dm

@@ -1,11 +1,20 @@
-// channel numbers for power
-#define EQUIP			1
-#define LIGHT			2
-#define ENVIRON			3
-#define TOTAL			4	//for total power used only
-#define STATIC_EQUIP 	5
-#define STATIC_LIGHT	6
-#define STATIC_ENVIRON	7
+// These are indexes in a list, and indexes for "dynamic" and static channels should be kept contiguous
+#define AREA_USAGE_EQUIP 1
+#define AREA_USAGE_LIGHT 2
+#define AREA_USAGE_ENVIRON 3
+#define AREA_USAGE_TOTAL 4
+#define AREA_USAGE_STATIC_EQUIP 5
+#define AREA_USAGE_STATIC_LIGHT	6
+#define AREA_USAGE_STATIC_ENVIRON 7
+#define AREA_USAGE_LEN AREA_USAGE_STATIC_ENVIRON // largest idx
+/// Index of the first dynamic usage channel
+#define AREA_USAGE_DYNAMIC_START AREA_USAGE_EQUIP
+/// Index of the last dynamic usage channel
+#define AREA_USAGE_DYNAMIC_END AREA_USAGE_ENVIRON
+/// Index of the first static usage channel
+#define AREA_USAGE_STATIC_START AREA_USAGE_STATIC_EQUIP
+/// Index of the last static usage channel
+#define AREA_USAGE_STATIC_END AREA_USAGE_STATIC_ENVIRON
 
 //Power use
 #define NO_POWER_USE 0

code/__DEFINES/mobs.dm

@@ -381,3 +381,6 @@
 
 ///Define for spawning megafauna instead of a mob for cave gen
 #define SPAWN_MEGAFAUNA "bluh bluh huge boss"
+
+///Swarmer flags
+#define SWARMER_LIGHT_ON (1<<0)

code/_onclick/hud/plane_master.dm

@@ -76,8 +76,9 @@
 
 /atom/movable/screen/plane_master/lighting/Initialize()
 	. = ..()
-	filters += filter(type="alpha", render_source=EMISSIVE_RENDER_TARGET, flags=MASK_INVERSE)
-	filters += filter(type="alpha", render_source=EMISSIVE_UNBLOCKABLE_RENDER_TARGET, flags=MASK_INVERSE)
+	filters += filter(type="alpha", render_source = EMISSIVE_RENDER_TARGET, flags = MASK_INVERSE)
+	filters += filter(type="alpha", render_source = EMISSIVE_UNBLOCKABLE_RENDER_TARGET, flags = MASK_INVERSE)
+	filters += filter(type="alpha", render_source = O_LIGHTING_VISUAL_RENDER_TARGET, flags = MASK_INVERSE)
 
 /**
   * Things placed on this mask the lighting plane. Doesn't render directly.
@@ -155,3 +156,11 @@
 	filters = list()
 	if(istype(mymob) && mymob.client?.prefs?.ambientocclusion)
 		filters += AMBIENT_OCCLUSION
+
+/atom/movable/screen/plane_master/o_light_visual
+	name = "overlight light visual plane master"
+	layer = O_LIGHTING_VISUAL_LAYER
+	plane = O_LIGHTING_VISUAL_PLANE
+	render_target = O_LIGHTING_VISUAL_RENDER_TARGET
+	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
+	blend_mode = BLEND_MULTIPLY

code/controllers/subsystem/lighting.dm

@@ -1,17 +1,16 @@
-GLOBAL_LIST_EMPTY(lighting_update_lights) // List of lighting sources  queued for update.
-GLOBAL_LIST_EMPTY(lighting_update_corners) // List of lighting corners  queued for update.
-GLOBAL_LIST_EMPTY(lighting_update_objects) // List of lighting objects queued for update.
-
 SUBSYSTEM_DEF(lighting)
 	name = "Lighting"
 	wait = 2
 	init_order = INIT_ORDER_LIGHTING
 	flags = SS_TICKER
+	var/static/list/sources_queue = list() // List of lighting sources queued for update.
+	var/static/list/corners_queue = list() // List of lighting corners queued for update.
+	var/static/list/objects_queue = list() // List of lighting objects queued for update.
 
 	loading_points = 6 SECONDS // Yogs -- loading times
 
 /datum/controller/subsystem/lighting/stat_entry(msg)
-	msg = "L:[GLOB.lighting_update_lights.len]|C:[GLOB.lighting_update_corners.len]|O:[GLOB.lighting_update_objects.len]"
+	msg = "L:[length(sources_queue)]|C:[length(corners_queue)]|O:[length(objects_queue)]"
 	return ..()
 
 
@@ -34,9 +33,10 @@ SUBSYSTEM_DEF(lighting)
 	MC_SPLIT_TICK_INIT(3)
 	if(!init_tick_checks)
 		MC_SPLIT_TICK
+	var/list/queue = sources_queue
 	var/i = 0
-	for (i in 1 to GLOB.lighting_update_lights.len)
-		var/datum/light_source/L = GLOB.lighting_update_lights[i]
+	for (i in 1 to length(queue))
+		var/datum/light_source/L = queue[i]
 
 		L.update_corners()
 
@@ -47,31 +47,34 @@ SUBSYSTEM_DEF(lighting)
 		else if (MC_TICK_CHECK)
 			break
 	if (i)
-		GLOB.lighting_update_lights.Cut(1, i+1)
+		queue.Cut(1, i+1)
 		i = 0
 
 	if(!init_tick_checks)
 		MC_SPLIT_TICK
 
-	for (i in 1 to GLOB.lighting_update_corners.len)
-		var/datum/lighting_corner/C = GLOB.lighting_update_corners[i]
+	queue = corners_queue
+	for (i in 1 to length(queue))
+		var/datum/lighting_corner/C = queue[i]
 
+		C.needs_update = FALSE //update_objects() can call qdel if the corner is storing no data
 		C.update_objects()
-		C.needs_update = FALSE
+
 		if(init_tick_checks)
 			CHECK_TICK
 		else if (MC_TICK_CHECK)
 			break
 	if (i)
-		GLOB.lighting_update_corners.Cut(1, i+1)
+		queue.Cut(1, i+1)
 		i = 0
 
 
 	if(!init_tick_checks)
 		MC_SPLIT_TICK
 
-	for (i in 1 to GLOB.lighting_update_objects.len)
-		var/datum/lighting_object/O = GLOB.lighting_update_objects[i]
+	queue = objects_queue
+	for (i in 1 to length(queue))
+		var/datum/lighting_object/O = queue[i]
 
 		if (QDELETED(O))
 			continue
@@ -83,7 +86,7 @@ SUBSYSTEM_DEF(lighting)
 		else if (MC_TICK_CHECK)
 			break
 	if (i)
-		GLOB.lighting_update_objects.Cut(1, i+1)
+		queue.Cut(1, i+1)
 
 
 /datum/controller/subsystem/lighting/Recover()