fix bloom the right way (#1011)

* fix bloom the right way

* ok i guess

Author: Kapu1178

code/modules/lighting/lighting_corner.dm

@@ -99,17 +99,6 @@
 	lum_g += delta_g
 	lum_b += delta_b
 
-	add_r = clamp((lum_r - 1.1) * 0.3, 0, 0.22)
-	add_g = clamp((lum_g - 1.1) * 0.3, 0, 0.22)
-	add_b = clamp((lum_b - 1.1) * 0.3, 0, 0.22)
-
-	// Client-shredding, does not cull any additive overlays.
-	//applying_additive = add_r || add_g || add_b
-	// Cull additive overlays that would be below 0.03 alpha in any color.
-	applying_additive = max(add_r, add_g, add_b) > 0.03
-	// Cull additive overlays whose color alpha sum is lower than 0.03
-	//applying_additive = (add_r + add_g + add_b) > 0.03
-
 	if (!needs_update)
 		needs_update = TRUE
 		SSlighting.corners_queue += src
@@ -125,9 +114,13 @@
 	if (largest_color_luminosity > 1)
 		. = 1 / largest_color_luminosity
 
-	// var/old_r = cache_r
-	// var/old_g = cache_g
-	// var/old_b = cache_b
+	var/old_r = cache_r
+	var/old_g = cache_g
+	var/old_b = cache_b
+
+	var/old_add_r = add_r
+	var/old_add_g = add_g
+	var/old_add_b = add_b
 
 	#if LIGHTING_SOFT_THRESHOLD != 0
 	else if (largest_color_luminosity < LIGHTING_SOFT_THRESHOLD)
@@ -142,14 +135,24 @@
 	cache_b = round(lum_b * ., LIGHTING_ROUND_VALUE)
 	#endif
 
+	add_r = clamp((lum_r - 1.1) * 0.3, 0, 0.22)
+	add_g = clamp((lum_g - 1.1) * 0.3, 0, 0.22)
+	add_b = clamp((lum_b - 1.1) * 0.3, 0, 0.22)
+
+	// Client-shredding, does not cull any additive overlays.
+	//applying_additive = add_r || add_g || add_b
+	// Cull additive overlays that would be below 0.03 alpha in any color.
+	applying_additive = max(add_r, add_g, add_b) > 0.03
+	// Cull additive overlays whose color alpha sum is lower than 0.03
+	//applying_additive = (add_r + add_g + add_b) > 0.03
+
 	src.largest_color_luminosity = round(largest_color_luminosity, LIGHTING_ROUND_VALUE)
 #ifdef VISUALIZE_LIGHT_UPDATES
-	if(!SSlighting.allow_duped_corners && old_r == cache_r && old_g == cache_g && old_b == cache_b)
+	if(!SSlighting.allow_duped_corners && old_r == cache_r && old_g == cache_g && old_b == cache_b && old_add_r == add_r && old_add_b == add_b && old_add_g == add_g)
 		return
 #else
-	// For some reason, preventing duped corners breaks bloom, so it's disabled.
-	// if(old_r == cache_r && old_g == cache_g && old_b == cache_b)
-	// 	return
+	if(old_r == cache_r && old_g == cache_g && old_b == cache_b && old_add_r == add_r && old_add_b == add_b && old_add_g == add_g)
+		return
 #endif
 
 	var/datum/lighting_object/lighting_object = master_NE?.lighting_object