[MIRROR] Try to replace light overlay to vis_contents (#140)

* Try to replace light overlay to vis_contents (#52389)

* Try to replace light overlay to vis_contents

* move glowybit creation in Initialize

* ups

* change mutable_appearance to SSvis_overlays

* set right settings

* Try to replace light overlay to vis_contents

Co-authored-by: Dennok <Deneles@yandex.ru>

code/modules/power/lighting.dm

@@ -239,6 +239,8 @@
 	var/bulb_emergency_pow_mul = 0.75	// the multiplier for determining the light's power in emergency mode
 	var/bulb_emergency_pow_min = 0.5	// the minimum value for the light's power in emergency mode
 
+	var/obj/effect/overlay/vis/glowybit		// the light overlay
+
 /obj/machinery/light/broken
 	status = LIGHT_BROKEN
 	icon_state = "tube-broken"
@@ -291,6 +293,8 @@
 /obj/machinery/light/Initialize(mapload)
 	. = ..()
 
+	glowybit = SSvis_overlays.add_vis_overlay(src, overlayicon, base_state, layer, plane, dir, alpha = 0, unique = TRUE)
+
 	if(!mapload) //sync up nightshift lighting for player made lights
 		var/area/A = get_area(src)
 		var/obj/machinery/power/apc/temp_apc = A.get_apc()
@@ -320,6 +324,8 @@
 		on = FALSE
 //		A.update_lights()
 	QDEL_NULL(cell)
+	vis_contents.Cut()
+	QDEL_NULL(glowybit)
 	return ..()
 
 /obj/machinery/light/update_icon_state()
@@ -340,9 +346,9 @@
 /obj/machinery/light/update_overlays()
 	. = ..()
 	if(on && status == LIGHT_OK)
-		var/mutable_appearance/glowybit = mutable_appearance(overlayicon, base_state, layer, EMISSIVE_PLANE)
 		glowybit.alpha = clamp(light_power*250, 30, 200)
-		. += glowybit
+	else
+		glowybit.alpha = 0
 
 // update the icon_state and luminosity of the light depending on its state
 /obj/machinery/light/proc/update(trigger = TRUE)