Big Fat Emission PR (#18124)

* amogus

* Revert "amogus"

This reverts commit ebaa99c77b.

* Part 1

* rest of the airlocks

holy shit that took a long time

* part 2

* part 3

finale

* conflict resolution

* fixes warnings

* fixes paneloen airlock emissives

* adds back changes from #18145

* #18085 sprites

* SteelSlayer Review

readded process in status_display, idk why I removed it, it broke some functionality

* future proofing firedoors

Talked with the contributor who added emissive appearances to the codebase. As of now they wont block them unless they spawn as closed, but with future PR merges this code will work.

* solar panel PR conflict resolve

* pain

* small fix

* farie82 suggestions

Co-authored-by: Farie82 <farie82@users.noreply.github.com>

* farie82 suggestions part 2

* farie82 suggestions part 3

* finalle

pog champ ers 2000

* farie82 suggestions the sequel

Co-authored-by: Farie82 <farie82@users.noreply.github.com>

* SteelSlayer Suggestions

Co-authored-by: SteelSlayer <42044220+SteelSlayer@users.noreply.github.com>

Co-authored-by: Farie82 <farie82@users.noreply.github.com>
Co-authored-by: SteelSlayer <42044220+SteelSlayer@users.noreply.github.com>

code/__DEFINES/lighting.dm

@@ -8,6 +8,8 @@
 #define LIGHTING_HEIGHT         1 // height off the ground of light sources on the pseudo-z-axis, you should probably leave this alone
 #define LIGHTING_ROUND_VALUE    (1 / 64) //Value used to round lumcounts, values smaller than 1/129 don't matter (if they do, thanks sinking points), greater values will make lighting less precise, but in turn increase performance, VERY SLIGHTLY.
 
+#define LIGHTING_MINIMUM_POWER 0.1
+
 #define LIGHTING_ICON 'icons/effects/lighting_object.dmi' // icon used for lighting shading effects
 
 // If the max of the lighting lumcounts of each spectrum drops below this, disable luminosity on the lighting objects.

code/game/gamemodes/nuclear/nuclearbomb.dm

@@ -75,6 +75,13 @@ GLOBAL_VAR(bomb_set)
 
 /obj/machinery/nuclearbomb/update_overlays()
 	. = ..()
+	underlays.Cut()
+	set_light(0)
+
+	if(!lighthack)
+		underlays += emissive_appearance(icon, "nuclearbomb_lightmask")
+		set_light(1, LIGHTING_MINIMUM_POWER)
+
 	if(panel_open)
 		. += "npanel_open"
 
@@ -322,6 +329,7 @@ GLOBAL_VAR(bomb_set)
 			if(!lighthack)
 				flick("nuclearbombc", src)
 				icon_state = "nuclearbomb1"
+				update_icon(UPDATE_OVERLAYS)
 			extended = TRUE
 			return
 		if("auth")
@@ -401,6 +409,7 @@ GLOBAL_VAR(bomb_set)
 			if(timing)
 				if(!lighthack)
 					icon_state = "nuclearbomb2"
+					update_icon(UPDATE_OVERLAYS)
 				if(!safety)
 					message_admins("[key_name_admin(usr)] engaged a nuclear bomb [ADMIN_JMP(src)]")
 					if(!is_syndicate)
@@ -414,6 +423,7 @@ GLOBAL_VAR(bomb_set)
 				GLOB.bomb_set = FALSE
 				if(!lighthack)
 					icon_state = "nuclearbomb1"
+					update_icon(UPDATE_OVERLAYS)
 
 
 /obj/machinery/nuclearbomb/blob_act(obj/structure/blob/B)
@@ -448,6 +458,7 @@ GLOBAL_VAR(bomb_set)
 	safety = TRUE
 	if(!lighthack)
 		icon_state = "nuclearbomb3"
+		update_icon(UPDATE_OVERLAYS)
 	playsound(src,'sound/machines/alarm.ogg',100,0,5)
 	if(SSticker && SSticker.mode)
 		SSticker.mode.explosion_in_progress = TRUE
@@ -502,6 +513,8 @@ GLOBAL_VAR(bomb_set)
 		if(!lighthack)
 			if(icon_state == "nuclearbomb2")
 				icon_state = "nuclearbomb1"
+				update_icon(UPDATE_OVERLAYS)
+
 	else
 		visible_message("<span class='notice'>[src] emits a quiet whirling noise!</span>")
 

code/game/machinery/computer/camera.dm

@@ -214,6 +214,17 @@
 	luminosity = 0
 	circuit = /obj/item/circuitboard/camera/telescreen/entertainment
 
+/obj/machinery/computer/security/telescreen/entertainment/Initialize()
+	. = ..()
+	set_light(1, LIGHTING_MINIMUM_POWER) //so byond doesnt cull, and we get an emissive appearance
+
+/obj/machinery/computer/security/telescreen/entertainment/power_change()
+	..()
+	if(stat & NOPOWER)
+		set_light(0)
+	else
+		set_light(1, LIGHTING_MINIMUM_POWER)
+
 /obj/machinery/computer/security/wooden_tv
 	name = "security camera monitor"
 	desc = "An old TV hooked into the station's camera network."

code/game/machinery/dance_machine.dm

@@ -76,6 +76,13 @@
 	else
 		icon_state = "disco0"
 
+/obj/machinery/disco/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(active)
+		underlays += emissive_appearance(icon, "disco_lightmask")
+
 /obj/machinery/disco/attack_hand(mob/user)
 	if(..())
 		return
@@ -125,7 +132,8 @@
 					playsound(src, 'sound/misc/compiler-failure.ogg', 50, 1)
 					return
 				active = TRUE
-				update_icon(UPDATE_ICON_STATE)
+				update_icon()
+				set_light(1, LIGHTING_MINIMUM_POWER) //for emmisive appearance
 				dance_setup()
 				START_PROCESSING(SSobj, src)
 				lights_spin()
@@ -480,7 +488,8 @@
 		STOP_PROCESSING(SSobj, src)
 		dance_over()
 		playsound(src,'sound/machines/terminal_off.ogg',50,1)
-		icon_state = "disco0"
+		update_icon()
+		set_light(0)
 		stop = world.time + 100
 
 

code/game/machinery/doors/airlock.dm

@@ -44,6 +44,7 @@
 
 
 GLOBAL_LIST_EMPTY(airlock_overlays)
+GLOBAL_LIST_EMPTY(airlock_emissive_underlays)
 
 /obj/machinery/door/airlock
 	name = "airlock"
@@ -97,6 +98,11 @@ GLOBAL_LIST_EMPTY(airlock_overlays)
 	var/image/old_dam_overlay
 	var/image/old_note_overlay
 
+	var/mutable_appearance/old_buttons_underlay
+	var/mutable_appearance/old_lights_underlay
+	var/mutable_appearance/old_damag_underlay
+	var/mutable_appearance/old_sparks_underlay
+
 	var/doorOpen = 'sound/machines/airlock_open.ogg'
 	var/doorClose = 'sound/machines/airlock_close.ogg'
 	var/doorDeni = 'sound/machines/deniedbeep.ogg' // i'm thinkin' Deni's
@@ -348,14 +354,20 @@ GLOBAL_LIST_EMPTY(airlock_overlays)
 	var/image/sparks_overlay
 	var/image/note_overlay
 	var/notetype = note_type()
+	var/mutable_appearance/buttons_underlay
+	var/mutable_appearance/lights_underlay
+	var/mutable_appearance/damag_underlay
+	var/mutable_appearance/sparks_underlay
 	switch(state)
 		if(AIRLOCK_CLOSED)
 			frame_overlay = get_airlock_overlay("closed", icon)
+			buttons_underlay = get_airlock_emissive_underlay("closed_lightmask", overlays_file)
 			if(airlock_material)
 				filling_overlay = get_airlock_overlay("[airlock_material]_closed", overlays_file)
 			else
 				filling_overlay = get_airlock_overlay("fill_closed", icon)
 			if(panel_open)
+				buttons_underlay = null
 				if(security_level)
 					panel_overlay = get_airlock_overlay("panel_closed_protected", overlays_file)
 				else
@@ -364,13 +376,17 @@ GLOBAL_LIST_EMPTY(airlock_overlays)
 				weld_overlay = get_airlock_overlay("welded", overlays_file)
 			if(obj_integrity <integrity_failure)
 				damag_overlay = get_airlock_overlay("sparks_broken", overlays_file)
+				damag_underlay = get_airlock_emissive_underlay( "sparks_broken_lightmask", overlays_file)
 			else if(obj_integrity < (0.75 * max_integrity))
 				damag_overlay = get_airlock_overlay("sparks_damaged", overlays_file)
+				damag_underlay = get_airlock_emissive_underlay("sparks_damaged_lightmask", overlays_file)
 			if(lights && arePowerSystemsOn())
 				if(locked)
 					lights_overlay = get_airlock_overlay("lights_bolts", overlays_file)
+					lights_underlay = get_airlock_emissive_underlay("lights_bolts_lightmask", overlays_file)
 				else if(emergency)
 					lights_overlay = get_airlock_overlay("lights_emergency", overlays_file)
+					lights_underlay = get_airlock_emissive_underlay("lights_emergency_lightmask", overlays_file)
 			if(note)
 				note_overlay = get_airlock_overlay(notetype, note_overlay_file)
 
@@ -383,36 +399,45 @@ GLOBAL_LIST_EMPTY(airlock_overlays)
 			else
 				filling_overlay = get_airlock_overlay("fill_closed", icon)
 			if(panel_open)
+				buttons_underlay = null
 				if(security_level)
 					panel_overlay = get_airlock_overlay("panel_closed_protected", overlays_file)
 				else
 					panel_overlay = get_airlock_overlay("panel_closed", overlays_file)
 			if(obj_integrity <integrity_failure)
 				damag_overlay = get_airlock_overlay("sparks_broken", overlays_file)
+				damag_underlay = get_airlock_emissive_underlay( "sparks_broken_lightmask", overlays_file)
 			else if(obj_integrity < (0.75 * max_integrity))
 				damag_overlay = get_airlock_overlay("sparks_damaged", overlays_file)
+				damag_underlay = get_airlock_emissive_underlay("sparks_damaged_lightmask", overlays_file)
 			if(welded)
 				weld_overlay = get_airlock_overlay("welded", overlays_file)
 			lights_overlay = get_airlock_overlay("lights_denied", overlays_file)
+			lights_underlay = get_airlock_emissive_underlay("lights_denied_lightmask", overlays_file)
 			if(note)
 				note_overlay = get_airlock_overlay(notetype, note_overlay_file)
 
 		if(AIRLOCK_EMAG)
 			frame_overlay = get_airlock_overlay("closed", icon)
+			buttons_underlay = get_airlock_emissive_underlay("closed_lightmask", overlays_file)
 			sparks_overlay = get_airlock_overlay("sparks", overlays_file)
+			sparks_underlay = get_airlock_emissive_underlay("sparks_lightmask", overlays_file)
 			if(airlock_material)
 				filling_overlay = get_airlock_overlay("[airlock_material]_closed", overlays_file)
 			else
 				filling_overlay = get_airlock_overlay("fill_closed", icon)
 			if(panel_open)
+				buttons_underlay = null
 				if(security_level)
 					panel_overlay = get_airlock_overlay("panel_closed_protected", overlays_file)
 				else
 					panel_overlay = get_airlock_overlay("panel_closed", overlays_file)
 			if(obj_integrity <integrity_failure)
 				damag_overlay = get_airlock_overlay("sparks_broken", overlays_file)
+				damag_underlay = get_airlock_emissive_underlay( "sparks_broken_lightmask", overlays_file)
 			else if(obj_integrity < (0.75 * max_integrity))
 				damag_overlay = get_airlock_overlay("sparks_damaged", overlays_file)
+				damag_underlay = get_airlock_emissive_underlay("sparks_damaged_lightmask", overlays_file)
 			if(welded)
 				weld_overlay = get_airlock_overlay("welded", overlays_file)
 			if(note)
@@ -420,13 +445,16 @@ GLOBAL_LIST_EMPTY(airlock_overlays)
 
 		if(AIRLOCK_CLOSING)
 			frame_overlay = get_airlock_overlay("closing", icon)
+			buttons_underlay = get_airlock_emissive_underlay("closing_lightmask", overlays_file)
 			if(airlock_material)
 				filling_overlay = get_airlock_overlay("[airlock_material]_closing", overlays_file)
 			else
 				filling_overlay = get_airlock_overlay("fill_closing", icon)
 			if(lights && arePowerSystemsOn())
 				lights_overlay = get_airlock_overlay("lights_closing", overlays_file)
+				lights_underlay = get_airlock_emissive_underlay("lights_closing_lightmask", overlays_file)
 			if(panel_open)
+				buttons_underlay = null
 				if(security_level)
 					panel_overlay = get_airlock_overlay("panel_closing_protected", overlays_file)
 				else
@@ -447,18 +475,22 @@ GLOBAL_LIST_EMPTY(airlock_overlays)
 					panel_overlay = get_airlock_overlay("panel_open", overlays_file)
 			if(obj_integrity < (0.75 * max_integrity))
 				damag_overlay = get_airlock_overlay("sparks_open", overlays_file)
+				damag_underlay = get_airlock_emissive_underlay("sparks_open_lightmask", overlays_file)
 			if(note)
 				note_overlay = get_airlock_overlay("[notetype]_open", note_overlay_file)
 
 		if(AIRLOCK_OPENING)
 			frame_overlay = get_airlock_overlay("opening", icon)
+			buttons_underlay = get_airlock_emissive_underlay("opening_lightmask", overlays_file)
 			if(airlock_material)
 				filling_overlay = get_airlock_overlay("[airlock_material]_opening", overlays_file)
 			else
 				filling_overlay = get_airlock_overlay("fill_opening", icon)
 			if(lights && arePowerSystemsOn())
 				lights_overlay = get_airlock_overlay("lights_opening", overlays_file)
+				lights_underlay = get_airlock_emissive_underlay("lights_opening_lightmask", overlays_file)
 			if(panel_open)
+				buttons_underlay = null
 				if(security_level)
 					panel_overlay = get_airlock_overlay("panel_opening_protected", overlays_file)
 				else
@@ -500,6 +532,24 @@ GLOBAL_LIST_EMPTY(airlock_overlays)
 		overlays += note_overlay
 		old_note_overlay = note_overlay
 
+	//EMISSIVE ICONS
+	if(buttons_underlay != old_buttons_underlay)
+		underlays -= old_buttons_underlay
+		underlays += buttons_underlay
+		old_buttons_underlay = buttons_underlay
+	if(lights_underlay != old_lights_underlay)
+		underlays -= old_lights_underlay
+		underlays += lights_underlay
+		old_lights_underlay = lights_underlay
+	if(damag_underlay != old_damag_underlay)
+		underlays -= old_damag_underlay
+		underlays += damag_underlay
+		old_damag_underlay = damag_underlay
+	if(sparks_underlay != old_sparks_underlay)
+		underlays -= old_sparks_underlay
+		underlays += sparks_underlay
+		old_sparks_underlay = sparks_underlay
+
 /proc/get_airlock_overlay(icon_state, icon_file)
 	var/iconkey = "[icon_state][icon_file]"
 	if(GLOB.airlock_overlays[iconkey])
@@ -507,6 +557,13 @@ GLOBAL_LIST_EMPTY(airlock_overlays)
 	GLOB.airlock_overlays[iconkey] = image(icon_file, icon_state)
 	return GLOB.airlock_overlays[iconkey]
 
+/proc/get_airlock_emissive_underlay(icon_state, icon_file)
+	var/iconkey = "[icon_state][icon_file]"
+	if(GLOB.airlock_emissive_underlays[iconkey])
+		return GLOB.airlock_emissive_underlays[iconkey]
+	GLOB.airlock_emissive_underlays[iconkey] = emissive_appearance(icon_file, icon_state)
+	return GLOB.airlock_emissive_underlays[iconkey]
+
 /obj/machinery/door/airlock/do_animate(animation)
 	switch(animation)
 		if("opening")

code/game/machinery/doors/firedoor.dm

@@ -21,6 +21,7 @@
 	closingLayer = CLOSED_FIREDOOR_LAYER
 	auto_close_time = 5 SECONDS
 	assemblytype = /obj/structure/firelock_frame
+	blocks_emissive = EMISSIVE_BLOCK_GENERIC
 	armor = list(MELEE = 30, BULLET = 30, LASER = 20, ENERGY = 20, BOMB = 10, BIO = 100, RAD = 100, FIRE = 95, ACID = 70)
 	/// How long does opening by hand take, in deciseconds.
 	var/manual_open_time = 5 SECONDS

code/game/machinery/firealarm.dm

@@ -25,7 +25,7 @@ FIRE ALARM
 	power_channel = ENVIRON
 	resistance_flags = FIRE_PROOF
 
-	light_power = 0
+	light_power = LIGHTING_MINIMUM_POWER
 	light_range = 7
 	light_color = "#ff3232"
 
@@ -60,12 +60,15 @@ FIRE ALARM
 /obj/machinery/firealarm/update_overlays()
 	. = ..()
 	underlays.Cut()
+
+	if(stat & (NOPOWER|BROKEN))
+		return
+
 	if(is_station_contact(z) && show_alert_level)
-		if(GLOB.security_level)
-			. += "overlay_[get_security_level()]"
-		if(light)
-			underlays += emissive_appearance(icon, "firealarm_overlay_lightmask")
-	if(light && !wiresexposed)
+		. += "overlay_[get_security_level()]"
+		underlays += emissive_appearance(icon, "firealarm_overlay_lightmask")
+
+	if(!wiresexposed)
 		underlays += emissive_appearance(icon, "firealarm_lightmask")
 
 /obj/machinery/firealarm/emag_act(mob/user)
@@ -212,18 +215,26 @@ FIRE ALARM
 	qdel(src)
 
 /obj/machinery/firealarm/proc/update_fire_light(fire)
-	if(fire == !!light_power)
+	if(stat & NOPOWER)
+		set_light(0)
+		return
+	else if(GLOB.security_level == SEC_LEVEL_EPSILON)
+		set_light(2, 1, COLOR_WHITE)
+		return
+	else if(fire == !!light_power || fire == !!(light_power - 0.1))
 		return  // do nothing if we're already active
+
 	if(fire)
 		set_light(l_power = 0.8)
 	else
-		set_light(l_power = 0)
+		set_light(l_power = LIGHTING_MINIMUM_POWER)
 
 /obj/machinery/firealarm/power_change()
 	if(powered(ENVIRON))
 		stat &= ~NOPOWER
 	else
 		stat |= NOPOWER
+	update_fire_light()
 	update_icon()
 
 /obj/machinery/firealarm/attack_hand(mob/user)
@@ -265,7 +276,6 @@ FIRE ALARM
 		return
 	var/area/A = get_area(src)
 	A.firealert(src) // Manually trigger alarms if the alarm isn't reported
-	update_icon()
 
 /obj/machinery/firealarm/New(location, direction, building)
 	. = ..()
@@ -282,6 +292,7 @@ FIRE ALARM
 /obj/machinery/firealarm/Initialize(mapload)
 	. = ..()
 	name = "fire alarm"
+	set_light(1, LIGHTING_MINIMUM_POWER) //for emissives
 	update_icon()
 
 /obj/machinery/firealarm/Destroy()

code/game/machinery/flasher.dm

@@ -16,6 +16,10 @@
 	var/base_state = "mflash"
 	anchored = TRUE
 
+/obj/machinery/flasher/Initialize()
+	. = ..()
+	update_icon()
+
 /obj/machinery/flasher/portable //Portable version of the flasher. Only flashes when anchored
 	name = "portable flasher"
 	desc = "A portable flashing device. Wrench to activate and deactivate. Cannot detect slow movements."
@@ -32,10 +36,29 @@
 /obj/machinery/flasher/power_change()
 	if( powered() )
 		stat &= ~NOPOWER
-		icon_state = "[base_state]1"
+		set_light(1, LIGHTING_MINIMUM_POWER)
 	else
 		stat |= ~NOPOWER
+		set_light(0)
+	update_icon()
+
+/obj/machinery/flasher/update_icon_state()
+	. = ..()
+
+	if(stat & NOPOWER)
 		icon_state = "[base_state]1-p"
+	else
+		icon_state = "[base_state]1"
+
+/obj/machinery/flasher/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(stat & NOPOWER)
+		return
+
+	underlays += emissive_appearance(icon, "[base_state]_lightmask")
+
 
 //Let the AI trigger them directly.
 /obj/machinery/flasher/attack_ai(mob/user)

code/game/machinery/hologram.dm

@@ -83,10 +83,26 @@ GLOBAL_LIST_EMPTY(holopads)
 /obj/machinery/hologram/holopad/power_change()
 	if(powered())
 		stat &= ~NOPOWER
+		set_light(1, LIGHTING_MINIMUM_POWER)
 	else
 		stat |= NOPOWER
 		if(outgoing_call)
 			outgoing_call.ConnectionFailure(src)
+		set_light(0)
+	update_icon(UPDATE_OVERLAYS)
+
+/obj/machinery/hologram/holopad/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(stat & NOPOWER)
+		return
+
+	var/total_users = LAZYLEN(masters) + LAZYLEN(holo_calls)
+	if(ringing)
+		underlays += emissive_appearance(icon, "holopad_ringing_lightmask")
+	else if(total_users)
+		underlays += emissive_appearance(icon, "holopad1_lightmask")
 
 /obj/machinery/hologram/holopad/obj_break()
 	. = ..()
@@ -407,7 +423,7 @@ For the other part of the code, check silicon say.dm. Particularly robot talk.*/
 		set_light(2)
 	else
 		set_light(0)
-	update_icon(UPDATE_ICON_STATE)
+	update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 
 /obj/machinery/hologram/holopad/update_icon_state()
 	var/total_users = LAZYLEN(masters) + LAZYLEN(holo_calls)

code/game/machinery/igniter.dm

@@ -27,10 +27,30 @@
 	add_fingerprint(user)
 
 	use_power(50)
-	src.on = !( src.on )
-	src.icon_state = text("igniter[]", src.on)
+	on = !on
+	update_icon()
+	if(on)
+		set_light(1, 1, "#ff821c")
+	else
+		set_light(0)
 	return
 
+/obj/machinery/igniter/update_icon_state()
+	. = ..()
+
+	if(stat & (NOPOWER|BROKEN))
+		icon_state = "igniter0"
+		return
+
+	icon_state = "igniter[on]"
+
+/obj/machinery/igniter/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(on)
+		underlays += emissive_appearance(icon, "igniter_lightmask")
+
 /obj/machinery/igniter/process()	//ugh why is this even in process()?
 	if(src.on && !(stat & NOPOWER) )
 		var/turf/location = src.loc
@@ -40,13 +60,13 @@
 
 /obj/machinery/igniter/Initialize(mapload)
 	. = ..()
-	icon_state = "igniter[on]"
+	update_icon()
 
 /obj/machinery/igniter/power_change()
-	if(!( stat & NOPOWER) )
-		icon_state = "igniter[src.on]"
-	else
-		icon_state = "igniter0"
+	. = ..()
+	if(stat & NOPOWER)
+		on = FALSE
+	update_icon()
 
 // Wall mounted remote-control igniter.
 

code/game/machinery/lightswitch.dm

@@ -69,6 +69,15 @@
 		return
 	icon_state = "light[on]"
 
+/obj/machinery/light_switch/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(stat & NOPOWER)
+		return
+
+	underlays += emissive_appearance(icon, "light_lightmask")
+
 /obj/machinery/light_switch/examine(mob/user)
 	. = ..()
 	. += "A light switch. It is [on ? "on" : "off"]."
@@ -129,10 +138,12 @@
 	if(!otherarea)
 		if(powered(LIGHT))
 			stat &= ~NOPOWER
+			set_light(1, LIGHTING_MINIMUM_POWER)
 		else
 			stat |= NOPOWER
+			set_light(0)
 
-		update_icon(UPDATE_ICON_STATE)
+		update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 
 /obj/machinery/light_switch/emp_act(severity)
 	if(stat & (BROKEN|NOPOWER))

code/game/machinery/recharger.dm

@@ -59,7 +59,7 @@
 			charging = G
 			use_power = ACTIVE_POWER_USE
 			using_power = check_cell_needs_recharging(get_cell_from(G))
-			update_icon(UPDATE_ICON_STATE)
+			update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 		else
 			to_chat(user, "<span class='notice'>[src] isn't connected to anything!</span>")
 		return TRUE
@@ -97,7 +97,7 @@
 		user.put_in_hands(charging)
 		charging = null
 		use_power = IDLE_POWER_USE
-		update_icon(UPDATE_ICON_STATE)
+		update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 
 /obj/machinery/recharger/attack_tk(mob/user)
 	if(charging)
@@ -105,14 +105,14 @@
 		charging.forceMove(loc)
 		charging = null
 		use_power = IDLE_POWER_USE
-		update_icon(UPDATE_ICON_STATE)
+		update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 
 /obj/machinery/recharger/process()
 	if(stat & (NOPOWER|BROKEN) || !anchored)
 		return
 
 	using_power = try_recharging_if_possible()
-	update_icon(UPDATE_ICON_STATE)
+	update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 
 /obj/machinery/recharger/emp_act(severity)
 	if(stat & (NOPOWER|BROKEN) || !anchored)
@@ -132,7 +132,11 @@
 
 /obj/machinery/recharger/power_change()
 	..()
-	update_icon(UPDATE_ICON_STATE)
+	if(stat & NOPOWER)
+		set_light(0)
+	else
+		set_light(1, LIGHTING_MINIMUM_POWER)
+	update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 
 /obj/machinery/recharger/update_icon_state()
 	if(stat & (NOPOWER|BROKEN) || !anchored)
@@ -146,6 +150,21 @@
 		return
 	icon_state = icon_state_idle
 
+/obj/machinery/recharger/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(stat & NOPOWER)
+		return
+
+	if(charging)
+		if(using_power)
+			underlays += emissive_appearance(icon, "[icon_state_charging]_lightmask")
+		else
+			underlays += emissive_appearance(icon, "[icon_state_charged]_lightmask")
+	else
+		underlays += emissive_appearance(icon, "[icon_state_idle]_lightmask")
+
 /obj/machinery/recharger/proc/get_cell_from(obj/item/I)
 	if(istype(I, /obj/item/gun/energy))
 		var/obj/item/gun/energy/E = I

code/game/machinery/requests_console.dm

@@ -73,7 +73,11 @@ GLOBAL_LIST_EMPTY(allRequestConsoles)
 
 /obj/machinery/requests_console/power_change()
 	..()
-	update_icon(UPDATE_ICON_STATE)
+	if(stat & NOPOWER)
+		set_light(0)
+	else
+		set_light(1, LIGHTING_MINIMUM_POWER)
+	update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 
 /obj/machinery/requests_console/update_icon_state()
 	if(stat & NOPOWER)
@@ -82,6 +86,19 @@ GLOBAL_LIST_EMPTY(allRequestConsoles)
 	else
 		icon_state = "req_comp[newmessagepriority]"
 
+/obj/machinery/requests_console/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(stat & NOPOWER)
+		return
+
+	if(newmessagepriority == RQ_NONEW_MESSAGES)
+		underlays += emissive_appearance(icon, "req_comp_lightmask")
+	else
+		underlays += emissive_appearance(icon, "req_comp2_lightmask")
+
+
 /obj/machinery/requests_console/Initialize(mapload)
 	Radio = new /obj/item/radio(src)
 	Radio.listening = TRUE
@@ -336,7 +353,7 @@ GLOBAL_LIST_EMPTY(allRequestConsoles)
 	capitalize(title)
 	if(newmessagepriority < priority)
 		newmessagepriority = priority
-		update_icon(UPDATE_ICON_STATE)
+		update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 	if(!silent)
 		playsound(loc, 'sound/machines/twobeep.ogg', 50, TRUE)
 		atom_say(title)

code/game/machinery/status_display.dm

@@ -59,6 +59,27 @@
 	..()
 	if(SSradio)
 		SSradio.add_object(src, frequency)
+	update_icon()
+
+/obj/machinery/status_display/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(stat & NOPOWER)
+		return
+
+	if(picture_state)
+		. += picture_state
+
+	underlays += emissive_appearance(icon, "lightmask")
+
+/obj/machinery/status_display/power_change()
+	..()
+	if(stat & NOPOWER)
+		set_light(0)
+	else
+		set_light(1, LIGHTING_MINIMUM_POWER)
+	update_icon(UPDATE_OVERLAYS)
 
 // timed process
 /obj/machinery/status_display/process()
@@ -160,9 +181,9 @@
 		index2 = 0
 
 /obj/machinery/status_display/proc/set_picture(state)
-	picture_state = state
 	remove_display()
-	overlays += image('icons/obj/status_display.dmi', icon_state=picture_state)
+	picture_state = state
+	update_icon(UPDATE_OVERLAYS)
 
 /obj/machinery/status_display/proc/update_display(line1, line2, warning = 0)
 	line1 = uppertext(line1)
@@ -172,10 +193,10 @@
 		maptext = new_text
 
 /obj/machinery/status_display/proc/remove_display()
-	if(overlays.len)
-		overlays.Cut()
 	if(maptext)
 		maptext = ""
+	picture_state = null
+	update_icon(UPDATE_OVERLAYS)
 
 /obj/machinery/status_display/receive_signal(datum/signal/signal)
 	switch(signal.data["command"])
@@ -213,85 +234,91 @@
 
 	var/emotion = "Neutral"
 
+/obj/machinery/ai_status_display/Initialize(mapload)
+	. = ..()
+	update_icon()
+
 /obj/machinery/ai_status_display/attack_ai(mob/living/silicon/ai/user)
 	if(isAI(user))
 		user.ai_statuschange()
 
-/obj/machinery/ai_status_display/process()
-	if(stat & NOPOWER)
-		overlays.Cut()
-		return
-	if(spookymode)
-		spookymode = FALSE
-		overlays.Cut()
-		return
-	update()
-
 /obj/machinery/ai_status_display/emp_act(severity)
 	if(stat & (BROKEN|NOPOWER))
 		..(severity)
 		return
-	set_picture("ai_bsod")
+	mode = 2
+	update_icon()
 	..(severity)
 
+/obj/machinery/ai_status_display/power_change()
+	..()
+	if(stat & NOPOWER)
+		set_light(0)
+	else
+		set_light(1, LIGHTING_MINIMUM_POWER)
+
 /obj/machinery/ai_status_display/flicker()
 	if(stat & (NOPOWER | BROKEN))
 		return FALSE
 
 	spookymode = TRUE
+	update_icon()
 	return TRUE
 
-/obj/machinery/ai_status_display/proc/update()
-	if(mode==0) //Blank
-		overlays.Cut()
+/obj/machinery/ai_status_display/update_overlays()
+	. = ..()
+
+	var/new_display
+
+	underlays.Cut()
+
+	if(stat & NOPOWER)
 		return
 
-	if(mode==1)	// AI emoticon
-		switch(emotion)
-			if("Very Happy")
-				set_picture("ai_veryhappy")
-			if("Happy")
-				set_picture("ai_happy")
-			if("Neutral")
-				set_picture("ai_neutral")
-			if("Unsure")
-				set_picture("ai_unsure")
-			if("Confused")
-				set_picture("ai_confused")
-			if("Sad")
-				set_picture("ai_sad")
-			if("Surprised")
-				set_picture("ai_surprised")
-			if("Upset")
-				set_picture("ai_upset")
-			if("Angry")
-				set_picture("ai_angry")
-			if("BSOD")
-				set_picture("ai_bsod")
-			if("Blank")
-				set_picture("ai_off")
-			if("Problems?")
-				set_picture("ai_trollface")
-			if("Awesome")
-				set_picture("ai_awesome")
-			if("Dorfy")
-				set_picture("ai_urist")
-			if("Facepalm")
-				set_picture("ai_facepalm")
-			if("Friend Computer")
-				set_picture("ai_friend")
-		return
+	switch(mode)
+		if(0) //Blank
+			new_display = "ai_off"
 
-	if(mode==2)	// BSOD
-		set_picture("ai_bsod")
-		return
+		if(1)	// AI emoticon
+			switch(emotion)
+				if("Very Happy")
+					new_display = "ai_veryhappy"
+				if("Happy")
+					new_display = "ai_happy"
+				if("Neutral")
+					new_display = "ai_neutral"
+				if("Unsure")
+					new_display = "ai_unsure"
+				if("Confused")
+					new_display = "ai_confused"
+				if("Sad")
+					new_display = "ai_sad"
+				if("Surprised")
+					new_display = "ai_surprised"
+				if("Upset")
+					new_display = "ai_upset"
+				if("Angry")
+					new_display = "ai_angry"
+				if("BSOD")
+					new_display = "ai_bsod"
+				if("Blank")
+					new_display = "ai_off"
+				if("Problems?")
+					new_display = "ai_trollface"
+				if("Awesome")
+					new_display = "ai_awesome"
+				if("Dorfy")
+					new_display = "ai_urist"
+				if("Facepalm")
+					new_display = "ai_facepalm"
+				if("Friend Computer")
+					new_display = "ai_friend"
 
+		if(2)	// BSOD
+			new_display ="ai_bsod"
 
-/obj/machinery/ai_status_display/proc/set_picture(state)
-	picture_state = state
-	if(overlays.len)
-		overlays.Cut()
-	overlays += image('icons/obj/status_display.dmi', icon_state=picture_state)
+	. += new_display
+	underlays += emissive_appearance(icon, "lightmask")
 
 #undef FONT_SIZE
 #undef FONT_COLOR

code/game/machinery/teleporter.dm

@@ -307,6 +307,24 @@
 	density = TRUE
 	anchored = TRUE
 
+/**
+	Internal helper function
+
+	Prevents AI from using the teleporter, prints out failure messages for clarity
+*/
+/obj/machinery/teleport/proc/blockAI(atom/A)
+	if(istype(A, /mob/living/silicon/ai) || istype(A, /obj/structure/AIcore))
+		visible_message("<span class='warning'>The teleporter rejects the AI unit.</span>")
+		if(istype(A, /mob/living/silicon/ai))
+			var/mob/living/silicon/ai/T = A
+			var/list/TPError = list("<span class='warning'>Firmware instructions dictate you must remain on your assigned station!</span>",
+			"<span class='warning'>You cannot interface with this technology and get rejected!</span>",
+			"<span class='warning'>External firewalls prevent you from utilizing this machine!</span>",
+			"<span class='warning'>Your AI core's anti-bluespace failsafes trigger and prevent teleportation!</span>")
+			to_chat(T, "[pick(TPError)]")
+		return TRUE
+	return FALSE
+
 /obj/machinery/teleport/hub
 	name = "teleporter hub"
 	desc = "It's the hub of a teleporting machine."
@@ -413,6 +431,19 @@
 	else
 		icon_state = "tele0"
 
+/obj/machinery/teleport/hub/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(power_station && power_station.engaged && !panel_open)
+		underlays += emissive_appearance(icon, "tele1_lightmask")
+
+/obj/machinery/teleport/hub/proc/update_lighting()
+	if(power_station && power_station.engaged && !panel_open)
+		set_light(2, 1, "#f1f1bd")
+	else
+		set_light(0)
+
 /obj/machinery/teleport/perma
 	name = "permanent teleporter"
 	desc = "A teleporter with the target pre-set on the circuit board."
@@ -425,6 +456,10 @@
 	var/target
 	var/tele_delay = 50
 
+/obj/machinery/teleport/perma/Initialize(mapload)
+	. = ..()
+	update_lighting()
+
 /obj/machinery/teleport/perma/RefreshParts()
 	for(var/obj/item/circuitboard/teleporter_perma/C in component_parts)
 		target = C.target
@@ -434,24 +469,6 @@
 	tele_delay = max(A, 0)
 	update_icon(UPDATE_ICON_STATE)
 
-/**
-	Internal helper function
-
-	Prevents AI from using the teleporter, prints out failure messages for clarity
-*/
-/obj/machinery/teleport/proc/blockAI(atom/A)
-	if(istype(A, /mob/living/silicon/ai) || istype(A, /obj/structure/AIcore))
-		visible_message("<span class='warning'>The teleporter rejects the AI unit.</span>")
-		if(istype(A, /mob/living/silicon/ai))
-			var/mob/living/silicon/ai/T = A
-			var/list/TPError = list("<span class='warning'>Firmware instructions dictate you must remain on your assigned station!</span>",
-			"<span class='warning'>You cannot interface with this technology and get rejected!</span>",
-			"<span class='warning'>External firewalls prevent you from utilizing this machine!</span>",
-			"<span class='warning'>Your AI core's anti-bluespace failsafes trigger and prevent teleportation!</span>")
-			to_chat(T, "[pick(TPError)]")
-		return TRUE
-	return FALSE
-
 /obj/machinery/teleport/perma/Bumped(atom/A)
 	if(stat & (BROKEN|NOPOWER))
 		return
@@ -464,16 +481,19 @@
 		use_power(5000)
 		if(tele_delay)
 			recalibrating = TRUE
-			update_icon(UPDATE_ICON_STATE)
+			update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
+			update_lighting()
 			addtimer(CALLBACK(src, .proc/BumpedCallback), tele_delay)
 
 /obj/machinery/teleport/perma/proc/BumpedCallback()
 	recalibrating = FALSE
-	update_icon(UPDATE_ICON_STATE)
+	update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
+	update_lighting()
 
 /obj/machinery/teleport/perma/power_change()
 	..()
-	update_icon(UPDATE_ICON_STATE)
+	update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
+	update_lighting()
 
 /obj/machinery/teleport/perma/update_icon_state()
 	if(panel_open)
@@ -483,6 +503,19 @@
 	else
 		icon_state = "tele0"
 
+/obj/machinery/teleport/perma/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(target && !recalibrating && !(stat & (BROKEN|NOPOWER)) && !panel_open)
+		underlays += emissive_appearance(icon, "tele1_lightmask")
+
+/obj/machinery/teleport/perma/proc/update_lighting()
+	if(target && !recalibrating && !panel_open && !(stat & (BROKEN|NOPOWER)))
+		set_light(2, 1, "#f1f1bd")
+	else
+		set_light(0)
+
 /obj/machinery/teleport/perma/attackby(obj/item/I, mob/user, params)
 	if(exchange_parts(user, I))
 		return
@@ -584,7 +617,7 @@
 
 /obj/machinery/teleport/station/screwdriver_act(mob/user, obj/item/I)
 	if(default_deconstruction_screwdriver(user, "controller-o", "controller", I))
-		update_icon(UPDATE_ICON_STATE)
+		update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 		return TRUE
 
 /obj/machinery/teleport/station/wirecutter_act(mob/user, obj/item/I)
@@ -618,15 +651,23 @@
 	else
 		visible_message("<span class='alert'>No target detected.</span>")
 		engaged = FALSE
-	teleporter_hub.update_icon(UPDATE_ICON_STATE)
+	teleporter_hub.update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
+	teleporter_hub.update_lighting()
 	if(istype(user))
 		add_fingerprint(user)
 
 /obj/machinery/teleport/station/power_change()
 	..()
-	update_icon(UPDATE_ICON_STATE)
+	update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
+
 	if(teleporter_hub)
-		teleporter_hub.update_icon(UPDATE_ICON_STATE)
+		teleporter_hub.update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
+		teleporter_hub.update_lighting()
+
+	if(stat & NOPOWER)
+		set_light(0)
+	else
+		set_light(1, LIGHTING_MINIMUM_POWER)
 
 /obj/machinery/teleport/station/update_icon_state()
 	if(panel_open)
@@ -635,3 +676,10 @@
 		icon_state = "controller-p"
 	else
 		icon_state = "controller"
+
+/obj/machinery/teleport/station/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(!(stat & NOPOWER) && !panel_open)
+		underlays += emissive_appearance(icon, "controller_lightmask")

code/game/objects/items/devices/radio/intercom.dm

@@ -7,6 +7,7 @@
 	w_class = WEIGHT_CLASS_BULKY
 	canhear_range = 2
 	flags = CONDUCT
+	blocks_emissive = FALSE
 	var/circuitry_installed = 1
 	var/buildstage = 0
 	var/custom_name
@@ -64,7 +65,7 @@
 		b_stat = TRUE
 		on = FALSE
 	GLOB.global_intercoms.Add(src)
-	update_icon(UPDATE_ICON_STATE)
+	update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 
 /obj/item/radio/intercom/Initialize()
 	. = ..()
@@ -205,7 +206,7 @@
 	on = FALSE
 	b_stat = TRUE
 	buildstage = 1
-	update_icon(UPDATE_ICON_STATE)
+	update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 	update_operating_status(FALSE)
 
 /obj/item/radio/intercom/welder_act(mob/user, obj/item/I)
@@ -226,6 +227,13 @@
 	else
 		icon_state = "intercom[!on?"-p":""][b_stat ? "-open":""]"
 
+/obj/item/radio/intercom/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(on && buildstage == 3)
+		underlays += emissive_appearance(icon, "intercom_lightmask")
+
 /obj/item/radio/intercom/proc/update_operating_status(on = TRUE)
 	var/area/current_area = get_area(src)
 	if(!current_area)
@@ -247,9 +255,11 @@
 	var/area/current_area = get_area(src)
 	if(!current_area)
 		on = FALSE
+		set_light(0)
 	else
 		on = current_area.powered(EQUIP) // set "on" to the equipment power status of our area.
-	update_icon(UPDATE_ICON_STATE)
+		set_light(1, LIGHTING_MINIMUM_POWER)
+	update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 
 /obj/item/intercom_electronics
 	name = "intercom electronics"

code/game/objects/structures/barsign.dm

@@ -9,8 +9,11 @@
 	armor = list(MELEE = 20, BULLET = 20, LASER = 20, ENERGY = 100, BOMB = 0, BIO = 0, RAD = 0, FIRE = 50, ACID = 50)
 	var/list/barsigns=list()
 	var/list/hiddensigns
-	var/prev_sign = ""
+	var/datum/barsign/current_sign
+	var/datum/barsign/prev_sign
 	var/panel_open = FALSE
+	blocks_emissive = FALSE
+	does_emissive = TRUE
 
 /obj/structure/sign/barsign/Initialize(mapload)
 	. = ..()
@@ -27,16 +30,39 @@
 /obj/structure/sign/barsign/proc/set_sign(datum/barsign/sign)
 	if(!istype(sign))
 		return
-	icon_state = sign.icon
+	current_sign = sign
 	name = sign.name
+
 	if(sign.desc)
 		desc = sign.desc
 	else
 		desc = "It displays \"[name]\"."
 
+	update_icon()
+
+/obj/structure/sign/barsign/update_icon_state()
+	. = ..()
+
+	if(!current_sign || broken)
+		icon_state = "empty"
+		return
+	icon_state = current_sign.icon
+
+/obj/structure/sign/barsign/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(current_sign == "empty" || broken || !current_sign)
+		return
+
+	underlays |= emissive_appearance(icon, current_sign.icon)
+
 /obj/structure/sign/barsign/obj_break(damage_flag)
 	if(!broken && !(flags & NODECONSTRUCT))
 		broken = TRUE
+		prev_sign = current_sign
+		set_light(0)
+		update_icon()
 
 /obj/structure/sign/barsign/deconstruct(disassembled = TRUE)
 	new /obj/item/stack/sheet/metal(drop_location(), 2)
@@ -53,8 +79,6 @@
 /obj/structure/sign/barsign/attack_ai(mob/user as mob)
 	return src.attack_hand(user)
 
-
-
 /obj/structure/sign/barsign/attack_hand(mob/user as mob)
 	if(!src.allowed(user))
 		to_chat(user, "<span class = 'info'>Access denied.</span>")
@@ -64,9 +88,6 @@
 		return
 	pick_sign()
 
-
-
-
 /obj/structure/sign/barsign/attackby(obj/item/I, mob/user)
 	if( istype(I, /obj/item/screwdriver))
 		if(!panel_open)
@@ -76,7 +97,8 @@
 		else
 			to_chat(user, "<span class='notice'>You close the maintenance panel.</span>")
 			if(!broken && !emagged)
-				set_sign(pick(barsigns))
+				set_sign(prev_sign)
+				set_light(1, LIGHTING_MINIMUM_POWER)
 			else if(emagged)
 				set_sign(new /datum/barsign/hiddensigns/syndibarsign)
 			else
@@ -100,15 +122,10 @@
 	else
 		return ..()
 
-
-
 /obj/structure/sign/barsign/emp_act(severity)
     set_sign(new /datum/barsign/hiddensigns/empbarsign)
     broken = TRUE
 
-
-
-
 /obj/structure/sign/barsign/emag_act(mob/user)
 	if(broken || emagged)
 		to_chat(user, "<span class='warning'>Nothing interesting happens!</span>")
@@ -123,44 +140,30 @@
 	emagged = TRUE
 	req_access = list(ACCESS_SYNDICATE)
 
-
-
-
 /obj/structure/sign/barsign/proc/pick_sign()
 	var/picked_name = input("Available Signage", "Bar Sign") as null|anything in barsigns
 	if(!picked_name)
 		return
 	set_sign(picked_name)
 
-
-
 //Code below is to define useless variables for datums. It errors without these
-
-
-
 /datum/barsign
 	var/name = "Name"
 	var/icon = "Icon"
 	var/desc = "desc"
 	var/hidden = 0
 
-
 //Anything below this is where all the specific signs are. If people want to add more signs, add them below.
-
-
-
 /datum/barsign/maltesefalcon
 	name = "Maltese Falcon"
 	icon = "maltesefalcon"
 	desc = "The Maltese Falcon, Space Bar and Grill."
 
-
 /datum/barsign/thebark
 	name = "The Bark"
 	icon = "thebark"
 	desc = "Ian's bar of choice."
 
-
 /datum/barsign/harmbaton
 	name = "The Harmbaton"
 	icon = "theharmbaton"
@@ -172,67 +175,56 @@
 	icon = "thesingulo"
 	desc = "Where people go that'd rather not be called by their name."
 
-
 /datum/barsign/thedrunkcarp
 	name = "The Drunk Carp"
 	icon = "thedrunkcarp"
 	desc = "Don't drink and swim."
 
-
 /datum/barsign/scotchservinwill
 	name = "Scotch Servin Willy's"
 	icon = "scotchservinwill"
 	desc = "Willy sure moved up in the world from clown to bartender."
 
-
 /datum/barsign/officerbeersky
 	name = "Officer Beersky's"
 	icon = "officerbeersky"
 	desc = "Man eat a dong, these drinks are great."
 
-
 /datum/barsign/thecavern
 	name = "The Cavern"
 	icon = "thecavern"
 	desc = "Fine drinks while listening to some fine tunes."
 
-
 /datum/barsign/theouterspess
 	name = "The Outer Spess"
 	icon = "theouterspess"
 	desc = "This bar isn't actually located in outer space."
 
-
 /datum/barsign/slipperyshots
 	name = "Slippery Shots"
 	icon = "slipperyshots"
 	desc = "Slippery slope to drunkeness with our shots!"
 
-
 /datum/barsign/thegreytide
 	name = "The Grey Tide"
 	icon = "thegreytide"
 	desc = "Abandon your toolboxing ways and enjoy a lazy beer!"
 
-
 /datum/barsign/honkednloaded
 	name = "Honked 'n' Loaded"
 	icon = "honkednloaded"
 	desc = "Honk."
 
-
 /datum/barsign/thenest
 	name = "The Nest"
 	icon = "thenest"
 	desc = "A good place to retire for a drink after a long night of crime fighting."
 
-
 /datum/barsign/thecoderbus
 	name = "The Coderbus"
 	icon = "thecoderbus"
 	desc = "A very controversial bar known for its wide variety of constantly-changing drinks."
 
-
 /datum/barsign/theadminbus
 	name = "The Adminbus"
 	icon = "theadminbus"
@@ -391,27 +383,18 @@
 /datum/barsign/hiddensigns
 	hidden = 1
 
-
 //Hidden signs list below this point
-
-
-
 /datum/barsign/hiddensigns/empbarsign
 	name = "Haywire Barsign"
 	icon = "empbarsign"
 	desc = "Something has gone very wrong."
 
-
-
 /datum/barsign/hiddensigns/syndibarsign
 	name = "Syndi Cat Takeover"
 	icon = "syndibarsign"
 	desc = "Syndicate or die."
 
-
-
 /datum/barsign/hiddensigns/signoff
 	name = "Bar Sign"
 	icon = "empty"
 	desc = "This sign doesn't seem to be on."
-

code/game/objects/structures/morgue.dm

@@ -41,6 +41,7 @@
 /obj/structure/morgue/Initialize()
 	. = ..()
 	update_icon(update_state())
+	set_light(1, LIGHTING_MINIMUM_POWER)
 
 /obj/structure/morgue/proc/update_state()
 	. = UPDATE_OVERLAYS
@@ -69,8 +70,10 @@
 
 /obj/structure/morgue/update_overlays()
 	. = ..()
+	underlays.Cut()
 	if(!connected)
 		. += "morgue_[status]"
+		underlays += emissive_appearance(icon, "morgue_[status]")
 	if(name != initial(name))
 		. += "morgue_label"
 

code/game/objects/structures/signs.dm

@@ -8,6 +8,22 @@
 	armor = list(MELEE = 50, BULLET = 0, LASER = 0, ENERGY = 0, BOMB = 0, BIO = 0, RAD = 0, FIRE = 50, ACID = 50)
 	flags_2 = RAD_PROTECT_CONTENTS_2 | RAD_NO_CONTAMINATE_2
 	blocks_emissive = EMISSIVE_BLOCK_GENERIC
+	var/does_emissive = FALSE
+
+/obj/structure/sign/Initialize(mapload)
+	. = ..()
+	if(does_emissive)
+		update_icon()
+		set_light(1, LIGHTING_MINIMUM_POWER)
+
+/obj/structure/sign/update_overlays()
+	. = ..()
+
+	underlays.Cut()
+	if(!does_emissive)
+		return
+
+	underlays += emissive_appearance(icon,"[icon_state]_lightmask")
 
 /obj/structure/sign/play_attack_sound(damage_amount, damage_type = BRUTE, damage_flag = 0)
 	switch(damage_type)
@@ -35,7 +51,6 @@
 	S.sign_state = icon_state
 	qdel(src)
 
-
 /obj/item/sign
 	name = "sign"
 	desc = ""
@@ -213,11 +228,15 @@
 	name = "\improper barber shop sign"
 	desc = "A spinning sign indicating a barbershop is near."
 	icon_state = "barber"
+	does_emissive = TRUE
+	blocks_emissive = FALSE
 
 /obj/structure/sign/chinese
 	name = "\improper chinese restaurant sign"
 	desc = "A glowing dragon invites you in."
 	icon_state = "chinese"
+	does_emissive = TRUE
+	blocks_emissive = FALSE
 
 /obj/structure/sign/science
 	name = "\improper SCIENCE!"

code/modules/atmospherics/machinery/airalarm.dm

@@ -392,6 +392,15 @@
 		if(ATMOS_ALARM_DANGER)
 			icon_state = "alarm1"
 
+/obj/machinery/alarm/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(stat & NOPOWER || buildstage != AIR_ALARM_READY || wiresexposed || shorted)
+		return
+
+	underlays += emissive_appearance(icon, "alarm_lightmask")
+
 /obj/machinery/alarm/proc/register_env_machine(m_id, device_type)
 	var/new_name
 	if(device_type=="AVP")
@@ -994,7 +1003,7 @@
 				coil.use(5)
 
 				buildstage = 2
-				update_icon(UPDATE_ICON_STATE)
+				update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 				first_run()
 				return
 		if(0)
@@ -1039,7 +1048,7 @@
 	if(!I.use_tool(src, user, 0, volume = I.tool_volume))
 		return
 	wiresexposed = !wiresexposed
-	update_icon(UPDATE_ICON_STATE)
+	update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 	if(wiresexposed)
 		SCREWDRIVER_OPEN_PANEL_MESSAGE
 	else
@@ -1072,13 +1081,15 @@
 /obj/machinery/alarm/power_change()
 	if(powered(power_channel))
 		stat &= ~NOPOWER
+		set_light(1, LIGHTING_MINIMUM_POWER)
 	else
 		stat |= NOPOWER
-	update_icon(UPDATE_ICON_STATE)
+		set_light(0)
+	update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 
 /obj/machinery/alarm/obj_break(damage_flag)
 	..()
-	update_icon(UPDATE_ICON_STATE)
+	update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 
 /obj/machinery/alarm/deconstruct(disassembled = TRUE)
 	if(!(flags & NODECONSTRUCT))
@@ -1099,7 +1110,7 @@
 /obj/machinery/alarm/proc/unshort_callback()
 	if(shorted)
 		shorted = FALSE
-		update_icon(UPDATE_ICON_STATE)
+		update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 
 /obj/machinery/alarm/proc/enable_ai_control_callback()
 	if(aidisabled)

code/modules/economy/ATM.dm

@@ -40,6 +40,32 @@ log transactions
 	. = ..()
 	machine_id = "[station_name()] RT #[GLOB.num_financial_terminals++]"
 	reconnect_database()
+	update_icon()
+
+/obj/machinery/atm/update_icon_state()
+	. = ..()
+
+	if(stat & NOPOWER)
+		icon_state = "atm_off"
+	else
+		icon_state = "atm"
+
+/obj/machinery/atm/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(stat & NOPOWER)
+		return
+
+	underlays += emissive_appearance(icon, "atm_lightmask")
+
+/obj/machinery/atm/power_change()
+	..()
+	if(stat & NOPOWER)
+		set_light(0)
+	else
+		set_light(1, LIGHTING_MINIMUM_POWER)
+	update_icon()
 
 /obj/machinery/atm/process()
 	if(stat & NOPOWER)

code/modules/mob/living/silicon/ai/ai.dm

@@ -933,6 +933,7 @@ GLOBAL_LIST_INIT(ai_verbs_default, list(
 		if(istype(M, /obj/machinery/ai_status_display))
 			var/obj/machinery/ai_status_display/AISD = M
 			AISD.emotion = emote
+			AISD.update_icon()
 		//if Friend Computer, change ALL displays
 		else if(istype(M, /obj/machinery/status_display))
 

code/modules/newscaster/obj/newscaster.dm

@@ -102,6 +102,11 @@
 
 /obj/machinery/newscaster/update_overlays()
 	. = ..()
+	underlays.Cut()
+
+	if(!(stat & NOPOWER))
+		underlays += emissive_appearance(icon, "newscaster_lightmask")
+
 	if(!GLOB.news_network.wanted_issue && alert) //wanted icon state, there can be no overlays on it as it's a priority message
 		. += "newscaster_alert"
 	var/hp_percent = obj_integrity * 100 / max_integrity
@@ -117,6 +122,10 @@
 
 /obj/machinery/newscaster/power_change()
 	..()
+	if(stat & NOPOWER)
+		set_light(0)
+	else
+		set_light(1, LIGHTING_MINIMUM_POWER)
 	update_icon()
 
 /obj/machinery/newscaster/take_damage(damage_amount, damage_type = BRUTE, damage_flag = 0, sound_effect = TRUE, attack_dir)
@@ -422,6 +431,8 @@
 				return
 			GLOB.news_network.wanted_issue = null
 			set_temp("Wanted notice cleared.", update_now = TRUE)
+			for(var/obj/machinery/newscaster/NC as anything in GLOB.allNewscasters)
+				NC.update_icon()
 			return FALSE
 		if("toggle_mute")
 			is_silent = !is_silent
@@ -533,8 +544,7 @@
 					SSblackbox.record_feedback("amount", "newscaster_stories", 1)
 					var/announcement = FC.get_announce_text(title)
 					// Announce it
-					for(var/nc in GLOB.allNewscasters)
-						var/obj/machinery/newscaster/NC = nc
+					for(var/obj/machinery/newscaster/NC as anything in GLOB.allNewscasters)
 						NC.alert_news(announcement)
 					// Redirect and eject photo
 					LAZYINITLIST(last_views[user_name])
@@ -567,8 +577,7 @@
 					WN.admin_locked = usr.can_admin_interact() && admin_locked
 					WN.publish_time = world.time
 					// Announce it and eject photo
-					for(var/nc in GLOB.allNewscasters)
-						var/obj/machinery/newscaster/NC = nc
+					for(var/obj/machinery/newscaster/NC as anything in GLOB.allNewscasters)
 						NC.alert_news(wanted_notice = TRUE)
 					eject_photo(usr)
 					set_temp("Wanted notice distributed.", "good")

code/modules/power/apc.dm

@@ -247,6 +247,8 @@
 
 	make_terminal()
 
+	set_light(1, LIGHTING_MINIMUM_POWER)
+
 	addtimer(CALLBACK(src, .proc/update), 5)
 
 /obj/machinery/power/apc/examine(mob/user)
@@ -330,7 +332,7 @@
 
 	if(force_update || update & 1) // Updating the icon state
 		..(UPDATE_ICON_STATE)
-	
+
 	if(!(update_state & UPSTATE_ALLGOOD))
 		if(managed_overlays)
 			..(UPDATE_OVERLAYS)
@@ -360,16 +362,31 @@
 
 /obj/machinery/power/apc/update_overlays()
 	. = ..()
+	underlays.Cut()
+
+	if(update_state & UPSTATE_BLUESCREEN)
+		underlays += emissive_appearance(icon, "emit_apcemag")
+		return
 	if(!(update_state & UPSTATE_ALLGOOD))
 		return
 
 	if(!(stat & (BROKEN|MAINT)) && update_state & UPSTATE_ALLGOOD)
-		. += status_overlays_lock[locked+1]
-		. += status_overlays_charging[charging+1]
+		var/image/statover_lock = status_overlays_lock[locked + 1]
+		var/image/statover_charg = status_overlays_charging[charging + 1]
+		. += statover_lock
+		. += statover_charg
+		underlays += emissive_appearance(icon, statover_lock.icon_state)
+		underlays += emissive_appearance(icon, statover_charg.icon_state)
 		if(operating)
-			. += status_overlays_equipment[equipment+1]
-			. += status_overlays_lighting[lighting+1]
-			. += status_overlays_environ[environ+1]
+			var/image/statover_equip = status_overlays_equipment[equipment + 1]
+			var/image/statover_light = status_overlays_lighting[lighting + 1]
+			var/image/statover_envir = status_overlays_environ[environ + 1]
+			. += statover_equip
+			. += statover_light
+			. += statover_envir
+			underlays += emissive_appearance(icon, statover_equip.icon_state)
+			underlays += emissive_appearance(icon, statover_light.icon_state)
+			underlays += emissive_appearance(icon, statover_envir.icon_state)
 
 /obj/machinery/power/apc/proc/check_updates()
 

code/modules/power/lighting.dm

@@ -282,7 +282,7 @@
 /obj/machinery/light/update_icon_state()
 	switch(status)		// set icon_states
 		if(LIGHT_OK)
-			if(emergency_mode)
+			if(emergency_mode || fire_mode)
 				icon_state = "[base_state]_emergency"
 			else
 				icon_state = "[base_state][on]"
@@ -296,6 +296,17 @@
 			icon_state = "[base_state]-broken"
 			on = FALSE
 
+/obj/machinery/light/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(status != LIGHT_OK || !on || !turning_on)
+		return
+	if(nightshift_enabled || emergency_mode || fire_mode)
+		underlays += emissive_appearance(icon, "[base_state]_emergency_lightmask")
+	else
+		underlays += emissive_appearance(icon, "[base_state]_lightmask")
+
 /**
   * Updates the light's 'on' state and power consumption based on [/obj/machinery/light/var/on].
   *
@@ -367,7 +378,6 @@
 		return // Nothing's changed here
 
 	switchcount++
-	update_icon()
 	if(trigger && (status == LIGHT_OK))
 		if(rigged)
 			log_admin("LOG: Rigged light explosion, last touched by [fingerprintslast].")
@@ -381,6 +391,7 @@
 			return
 
 	use_power = ACTIVE_POWER_USE
+	update_icon()
 	set_light(BR, PO, CO)
 	if(play_sound)
 		playsound(src, 'sound/machines/light_on.ogg', 60, TRUE)
@@ -572,9 +583,11 @@
 		return
 	if(fire_mode)
 		set_light(nightshift_light_range, nightshift_light_power, bulb_emergency_colour)
+		update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 		return
 	emergency_mode = TRUE
 	set_light(3, 1.7, bulb_emergency_colour)
+	update_icon(UPDATE_ICON_STATE | UPDATE_OVERLAYS)
 	RegisterSignal(current_area, COMSIG_AREA_POWER_CHANGE, .proc/update, override = TRUE)
 
 /obj/machinery/light/proc/emergency_lights_off(area/current_area, obj/machinery/power/apc/current_apc)

code/modules/recycling/disposal.dm

@@ -145,6 +145,7 @@
 	else if(mode==-1)
 		mode=0
 	to_chat(user, "You [mode ? "unfasten": "fasten"] the screws around the power connection.")
+	update()
 
 /obj/machinery/disposal/welder_act(mob/user, obj/item/I)
 	if(mode != required_mode_to_deconstruct)
@@ -315,30 +316,47 @@
 
 // update the icon & overlays to reflect mode & status
 /obj/machinery/disposal/proc/update()
-	overlays.Cut()
 	if(stat & BROKEN)
-		icon_state = "disposal-broken"
 		mode = 0
 		flush = 0
+
+	update_icon()
+
+/obj/machinery/disposal/update_icon_state()
+	. = ..()
+
+	if(stat & BROKEN)
+		icon_state = "disposal-broken"
 		return
 
-	// flush handle
-	if(flush)
-		overlays += image('icons/obj/pipes/disposal.dmi', "dispover-handle")
+	icon_state = initial(icon_state)
 
-	// only handle is shown if no power
-	if(stat & NOPOWER || mode == -1)
+/obj/machinery/disposal/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(flush)
+		. += "dispover-handle"
+
+	if(stat & (NOPOWER|BROKEN) || mode == -1)
 		return
 
 	// 	check for items in disposal - occupied light
 	if(contents.len > 0)
-		overlays += image('icons/obj/pipes/disposal.dmi', "dispover-full")
+		. += "dispover-full"
+		underlays += emissive_appearance(icon, "dispover-full")
 
 	// charging and ready light
-	if(mode == 1)
-		overlays += image('icons/obj/pipes/disposal.dmi', "dispover-charge")
-	else if(mode == 2)
-		overlays += image('icons/obj/pipes/disposal.dmi', "dispover-ready")
+	switch(mode)
+		if(-1)
+			. += "dispover-unscrewed"
+		if(1)
+			. += "dispover-charge"
+			. += "dispover-panel"
+			underlays += emissive_appearance(icon, "dispover-charge")
+		if(2)
+			. += "dispover-ready"
+			underlays += emissive_appearance(icon, "dispover-ready")
 
 // timed process
 // charge the gas reservoir and perform flush if ready
@@ -436,6 +454,10 @@
 /obj/machinery/disposal/power_change()
 	..()	// do default setting/reset of stat NOPOWER bit
 	update()	// update icon
+	if(stat & NOPOWER)
+		set_light(0)
+	else
+		set_light(1, LIGHTING_MINIMUM_POWER)
 	return
 
 

code/modules/security_levels/keycard_authentication.dm

@@ -25,6 +25,22 @@
 	req_access = list(ACCESS_KEYCARD_AUTH)
 	resistance_flags = INDESTRUCTIBLE | LAVA_PROOF | FIRE_PROOF | UNACIDABLE | ACID_PROOF
 
+/obj/machinery/keycard_auth/update_icon_state()
+	. = ..()
+
+	if(event_triggered_by || event_source)
+		icon_state = "auth_on"
+	else
+		icon_state = "auth_off"
+
+/obj/machinery/keycard_auth/update_overlays()
+	. = ..()
+	underlays.Cut()
+
+	if(event_triggered_by || event_source)
+		underlays += emissive_appearance(icon, "auth_lightmask")
+
+
 /obj/machinery/keycard_auth/attack_ai(mob/user as mob)
 	to_chat(user, "<span class='warning'>The station AI is not to interact with these devices.</span>")
 	return
@@ -57,9 +73,9 @@
 /obj/machinery/keycard_auth/power_change()
 	if(powered(ENVIRON))
 		stat &= ~NOPOWER
-		icon_state = "auth_off"
 	else
 		stat |= NOPOWER
+	update_icon()
 
 /obj/machinery/keycard_auth/attack_ghost(mob/user)
 	ui_interact(user)
@@ -115,12 +131,14 @@
 	swiping = FALSE
 	confirmed = FALSE
 	event_source = null
-	icon_state = "auth_off"
 	event_triggered_by = null
 	event_confirmed_by = null
+	set_light(0)
+	update_icon()
 
 /obj/machinery/keycard_auth/proc/broadcast_request()
-	icon_state = "auth_on"
+	update_icon()
+	set_light(1, LIGHTING_MINIMUM_POWER)
 	for(var/obj/machinery/keycard_auth/KA in GLOB.machines)
 		if(KA == src) continue
 		KA.reset()
@@ -138,19 +156,24 @@
 /obj/machinery/keycard_auth/proc/receive_request(obj/machinery/keycard_auth/source)
 	if(stat & (BROKEN|NOPOWER))
 		return
+
+	set_light(1, LIGHTING_MINIMUM_POWER)
+
 	event_source = source
 	busy = TRUE
 	active = TRUE
 	SStgui.update_uis(src)
-	icon_state = "auth_on"
+	update_icon()
 
 	sleep(confirm_delay)
 
 	event_source = null
-	icon_state = "auth_off"
+	update_icon()
 	active = FALSE
 	busy = FALSE
 
+	set_light(0)
+
 /obj/machinery/keycard_auth/proc/trigger_event()
 	switch(event)
 		if("Red Alert")

code/modules/security_levels/security_levels.dm

@@ -123,6 +123,7 @@ GLOBAL_DATUM_INIT(security_announcement_down, /datum/announcement/priority/secur
 	for(var/obj/machinery/firealarm/FA in GLOB.machines)
 		if(is_station_contact(FA.z))
 			FA.update_icon()
+			FA.update_fire_light()
 
 /proc/num2seclevel(num)
 	switch(num)