Revert "Merge pull request #4779 from Neerti/2/1/2018_make_the_sun_not_lag_again"

This reverts commit f4df29713d, reversing
changes made to 337e5e7436.

code/modules/lighting/lighting_atom.dm

@@ -5,7 +5,6 @@
 
 	var/datum/light_source/light
 	var/list/light_sources
-	var/light_datum_type = /datum/light_source
 
 // Nonsensical value for l_color default, so we can detect if it gets set to null.
 #define NONSENSICAL_VALUE -99999
@@ -42,7 +41,7 @@
 		if(light)
 			light.update(.)
 		else
-			light = new light_datum_type(src, .)
+			light = new /datum/light_source(src, .)
 
 /atom/New()
 	. = ..()
@@ -110,19 +109,3 @@
 /obj/item/dropped()
 	. = ..()
 	update_light()
-
-/obj/effect/sun
-	name = "sun"
-	desc ="SUNTHESUNTHESUNTHESUNTHE"
-	icon = 'icons/effects/effects.dmi'
-	icon_state = "sun"
-	invisibility = 100
-	anchored = TRUE
-	light_datum_type = /datum/light_source/sun
-	light_color = "#FFFFFF"
-	light_range = 65
-
-/obj/effect/sun/Destroy(force = FALSE)
-	if(!force)
-		return QDEL_HINT_LETMELIVE
-	return ..()

code/modules/lighting/lighting_source.dm

@@ -284,106 +284,6 @@
 		C.affecting -= src
 		effect_str -= C
 
-#define APPLY_CORNER_NO_FALLOFF(C)   \
-	. = 1;                           \
-	. *= light_power;                \
-                                     \
-	effect_str[C] = .;               \
-                                     \
-	C.update_lumcount                \
-	(                                \
-		. * applied_lum_r,           \
-		. * applied_lum_g,           \
-		. * applied_lum_b            \
-	);
-
-// Special snowflake subtype used to light the Surface.
-// The big differences is that this ignores FOV calculations (and as such doesn't use DVIEW) and instead applies it to all
-// 'outdoor' turfs within range.
-// Another difference is it has no falloff, meaning that it creates a big flat square instead of a circle that gets darker towards the edges.
-/datum/light_source/sun
-
-/datum/light_source/sun/recalc_corner(var/datum/lighting_corner/C)
-	if(effect_str.Find(C)) // Already have one.
-		REMOVE_CORNER(C)
-
-	APPLY_CORNER_NO_FALLOFF(C)
-
-/datum/light_source/sun/apply_lum()
-	var/static/update_gen = 1
-	applied = 1
-
-	// Keep track of the last applied lum values so that the lighting can be reversed
-	applied_lum_r = lum_r
-	applied_lum_g = lum_g
-	applied_lum_b = lum_b
-
-	for(var/thing in RANGE_TURFS(light_range, source_turf) )
-		var/turf/T = thing
-		if(!T.lighting_corners_initialised)
-			T.generate_missing_corners()
-
-		if(!T.outdoors)
-			continue
-
-		for(var/datum/lighting_corner/C in T.get_corners())
-			if(C.update_gen == update_gen)
-				continue
-
-			C.update_gen = update_gen
-			C.affecting += src
-
-			if(!C.active)
-				effect_str[C] = 0
-				continue
-
-			APPLY_CORNER_NO_FALLOFF(C)
-
-		if(!T.affecting_lights)
-			T.affecting_lights = list()
-
-		T.affecting_lights += src
-		affecting_turfs    += T
-
-	update_gen++
-
-/datum/light_source/sun/smart_vis_update()
-	var/list/datum/lighting_corner/corners = list()
-	var/list/turf/turfs                    = list()
-
-	for(var/thing in RANGE_TURFS(light_range, source_turf) )
-		var/turf/T = thing
-		if(!T.lighting_corners_initialised)
-			T.generate_missing_corners()
-		corners |= T.get_corners()
-		turfs   += T
-
-	var/list/L = turfs - affecting_turfs // New turfs, add us to the affecting lights of them.
-	affecting_turfs += L
-	for(var/turf/T in L)
-		if(!T.affecting_lights)
-			T.affecting_lights = list(src)
-		else
-			T.affecting_lights += src
-
-	L = affecting_turfs - turfs // Now-gone turfs, remove us from the affecting lights.
-	affecting_turfs -= L
-	for(var/turf/T in L)
-		T.affecting_lights -= src
-
-	for(var/datum/lighting_corner/C in corners - effect_str) // New corners
-		C.affecting += src
-		if(!C.active)
-			effect_str[C] = 0
-			continue
-
-		APPLY_CORNER_NO_FALLOFF(C)
-
-	for(var/datum/lighting_corner/C in effect_str - corners) // Old, now gone, corners.
-		REMOVE_CORNER(C)
-		C.affecting -= src
-		effect_str -= C
-
 #undef effect_update
 #undef LUM_FALLOFF
 #undef REMOVE_CORNER