NVG Bugfix

Now they work, and also added a green hud element that tints the screen green when nvg's are worn.

code/_onclick/hud/hud.dm

@@ -14,6 +14,7 @@ var/datum/global_hud/global_hud = new()
 	var/obj/screen/blurry
 	var/list/vimpaired
 	var/list/darkMask
+	var/obj/screen/nvg
 
 /datum/global_hud/New()
 	//420erryday psychedellic colours screen overlay for when you are high
@@ -30,6 +31,13 @@ var/datum/global_hud/global_hud = new()
 	blurry.layer = 17
 	blurry.mouse_opacity = 0
 
+	nvg = new /obj/screen()
+	nvg.screen_loc = "1,1"
+	nvg.icon = 'icons/obj/nvg_hud_full.dmi'
+	nvg.icon_state = "nvg_hud"
+	nvg.layer = 17
+	nvg.mouse_opacity = 0
+
 	var/obj/screen/O
 	var/i
 	//that nasty looking dither you  get when you're short-sighted

code/modules/clothing/glasses/glasses.dm

@@ -35,7 +35,7 @@
 	icon_state = "night"
 	item_state = "glasses"
 	origin_tech = "magnets=2"
-	darkness_view = 3
+	darkness_view = 7
 
 /obj/item/clothing/glasses/eyepatch
 	name = "eyepatch"

code/modules/mob/living/carbon/human/life.dm

@@ -1138,7 +1138,7 @@
 			if(copytext(hud.icon_state,1,4) == "hud") //ugly, but icon comparison is worse, I believe
 				client.images.Remove(hud)
 
-		client.screen.Remove(global_hud.blurry, global_hud.druggy, global_hud.vimpaired, global_hud.darkMask)
+		client.screen.Remove(global_hud.blurry, global_hud.druggy, global_hud.vimpaired, global_hud.darkMask, global_hud.nvg)
 
 		update_action_buttons()
 
@@ -1277,8 +1277,9 @@
 					see_in_dark += G.darkness_view
 					if(G.vision_flags)
 						sight |= G.vision_flags
-						if(!druggy)
-							see_invisible = SEE_INVISIBLE_MINIMUM
+				if(istype(G,/obj/item/clothing/glasses/night))
+					see_invisible = SEE_INVISIBLE_MINIMUM
+					client.screen += global_hud.nvg
 
 	/* HUD shit goes here, as long as it doesn't modify sight flags */
 	// The purpose of this is to stop xray and w/e from preventing you from using huds -- Love, Doohl
@@ -1296,6 +1297,8 @@
 			else if(!seer)
 				see_invisible = SEE_INVISIBLE_LIVING
 
+			
+
 			if(healths)
 				if (analgesic)
 					healths.icon_state = "health_health_numb"