Properly layer and set/clear fullscreen overlays

This fixes ordering issues and admin ghosting

code/_onclick/hud/fullscreen.dm

@@ -1,10 +1,12 @@
+#define FULLSCREEN_LAYER 18
+#define DAMAGE_LAYER FULLSCREEN_LAYER + 0.1
+#define BLIND_LAYER DAMAGE_LAYER + 0.1
+#define CRIT_LAYER BLIND_LAYER + 0.1
+
 /mob
 	var/list/screens = list()
 
 /mob/proc/overlay_fullscreen(category, type, severity)
-	if(!category)
-		return
-
 	var/obj/screen/fullscreen/screen
 	if(screens[category])
 		screen = screens[category]
@@ -20,15 +22,14 @@
 	screen.severity = severity
 
 	screens[category] = screen
-	if(client && hud_used)
-		hud_used.update_fullscreen()
-
+	if(client)
+		client.screen += screen
 	return screen
 
 /mob/proc/clear_fullscreen(category, animate = 10)
 	var/obj/screen/fullscreen/screen = screens[category]
 	if(!screen)
-		return FALSE
+		return
 
 	if(animate)
 		animate(screen, alpha = 0, time = animate)
@@ -38,42 +39,44 @@
 	if(client)
 		client.screen -= screen
 	qdel(screen)
-	return TRUE
 
-/datum/hud/proc/update_fullscreen()
+/mob/proc/clear_fullscreens()
+	for(var/category in screens)
+		clear_fullscreen(category)
+
+/datum/hud/proc/reload_fullscreen()
 	var/list/screens = mymob.screens
-	if(hud_shown)
-		for(var/screen in screens)
-			mymob.client.screen |= screens[screen]
-	else
-		for(var/screen in screens)
-			mymob.client.screen -= screens[screen]
+	for(var/category in screens)
+		mymob.client.screen |= screens[category]
 
 /obj/screen/fullscreen
 	icon = 'icons/mob/screen_full.dmi'
 	icon_state = "default"
 	screen_loc = "CENTER-7,CENTER-7"
-	layer = 18
+	layer = FULLSCREEN_LAYER
 	mouse_opacity = 0
 	var/severity = 0
 
 /obj/screen/fullscreen/Destroy()
 	..()
 	severity = 0
-	screen_loc = ""
 	return QDEL_HINT_PUTINPOOL
 
 /obj/screen/fullscreen/brute
 	icon_state = "brutedamageoverlay"
+	layer = DAMAGE_LAYER
 
 /obj/screen/fullscreen/oxy
 	icon_state = "oxydamageoverlay"
+	layer = DAMAGE_LAYER
 
 /obj/screen/fullscreen/crit
 	icon_state = "passage"
+	layer = CRIT_LAYER
 
 /obj/screen/fullscreen/blind
 	icon_state = "blackimageoverlay"
+	layer = BLIND_LAYER
 
 /obj/screen/fullscreen/impaired
 	icon_state = "impairedoverlay"
@@ -97,3 +100,8 @@
 	icon = 'icons/mob/screen_gen.dmi'
 	screen_loc = "WEST,SOUTH to EAST,NORTH"
 	icon_state = "druggy"
+
+#undef FULLSCREEN_LAYER
+#undef BLIND_LAYER
+#undef DAMAGE_LAYER
+#undef CRIT_LAYER

code/_onclick/hud/hud.dm

@@ -205,6 +205,8 @@
 	else if(isovermind(mymob))
 		blob_hud()
 
+	reload_fullscreen() // Reload any fullscreen overlays this mob has.
+
 //Version denotes which style should be displayed. blank or 0 means "next version"
 /datum/hud/proc/show_hud(version = 0)
 	if(!ismob(mymob))
@@ -234,11 +236,6 @@
 			mymob.client.screen += mymob.internals
 			mymob.client.screen += lingstingdisplay
 			mymob.client.screen += lingchemdisplay
-
-			hidden_inventory_update()
-			persistant_inventory_update()
-			mymob.update_action_buttons()
-			reorganize_alerts()
 		if(HUD_STYLE_REDUCED)	//Reduced HUD
 			hud_shown = 0	//Governs behavior of other procs
 			if(adding)
@@ -258,11 +255,6 @@
 			mymob.client.screen += r_hand_hud_object	//we want the hands to be visible
 			mymob.client.screen += action_intent		//we want the intent swticher visible
 			action_intent.screen_loc = ui_acti_alt	//move this to the alternative position, where zone_select usually is.
-
-			hidden_inventory_update()
-			persistant_inventory_update()
-			mymob.update_action_buttons()
-			reorganize_alerts()
 		if(HUD_STYLE_NOHUD)	//No HUD
 			hud_shown = 0	//Governs behavior of other procs
 			if(adding)
@@ -279,11 +271,11 @@
 			mymob.client.screen -= mymob.internals
 			mymob.client.screen -= lingstingdisplay
 			mymob.client.screen -= lingchemdisplay
-
 	hidden_inventory_update()
 	persistant_inventory_update()
 	mymob.update_action_buttons()
 	reorganize_alerts()
+
 	hud_version = display_hud_version
 
 //Triggered when F12 is pressed (Unless someone changed something in the DMF)

code/modules/mob/living/death.dm

@@ -1,3 +1,16 @@
+/mob/living/death(gibbed)
+	eye_blind = max(eye_blind, 1)
+	timeofdeath = world.time
+
+	living_mob_list -= src
+	if(!gibbed)
+		dead_mob_list += src
+	else if(buckled)
+		buckled.unbuckle_mob()
+
+	clear_fullscreens()
+	..()
+
 /mob/living/gib(animation = 1)
 	var/prev_lying = lying
 	death(1)
@@ -34,17 +47,6 @@
 /mob/living/proc/dust_animation(animate, flick_name = "")
 	flick(flick_name, animate)
 
-/mob/living/death(gibbed)
-	eye_blind = max(eye_blind, 1)
-	timeofdeath = world.time
-
-	living_mob_list -= src
-	if(!gibbed)
-		dead_mob_list += src
-	else if(buckled)
-		buckled.unbuckle_mob()
-
-
 /mob/living/proc/setup_animation(animation, prev_lying)
 	var/atom/movable/overlay/animate = null
 	notransform = 1