Adds Berserk

code/modules/mob/_modifiers/modifiers.dm

@@ -19,6 +19,7 @@
 	var/light_range = null				// How far the light for the above var goes. Not implemented yet.
 	var/light_intensity = null			// Ditto. Not implemented yet.
 	var/mob_overlay_state = null		// Icon_state for an overlay to apply to a (human) mob while this exists.  This is actually implemented.
+	var/client_color = null				// If set, the client will have the world be shown in this color, from their perspective.
 
 	// Now for all the different effects.
 	// Percentage modifiers are expressed as a multipler. (e.g. +25% damage should be written as 1.25)
@@ -43,6 +44,7 @@
 	var/metabolism_percent				// Adjusts the mob's metabolic rate, which affects reagent processing.  Won't affect mobs without reagent processing.
 	var/icon_scale_percent				// Makes the holder's icon get scaled up or down.
 	var/attack_speed_percent			// Makes the holder's 'attack speed' (click delay) shorter or longer.
+	var/pain_immunity					// Makes the holder not care about pain while this is on. Only really useful to human mobs.
 
 /datum/modifier/New(var/new_holder, var/new_origin)
 	holder = new_holder
@@ -52,6 +54,11 @@
 		origin = weakref(holder)
 	..()
 
+// Checks if the modifier should be allowed to be applied to the mob before attaching it.
+// Override for special criteria, e.g. forbidding robots from receiving it.
+/datum/modifier/proc/can_apply(var/mob/living/L)
+	return TRUE
+
 // Checks to see if this datum should continue existing.
 /datum/modifier/proc/check_if_valid()
 	if(expire_at && expire_at < world.time) // Is our time up?
@@ -66,8 +73,14 @@
 		holder.update_modifier_visuals()
 	if(icon_scale_percent) // Correct the scaling.
 		holder.update_transform()
+	if(client_color)
+		holder.update_client_color()
 	qdel(src)
 
+// Override this for special effects when it gets added to the mob.
+/datum/modifier/proc/on_applied()
+	return
+
 // Override this for special effects when it gets removed.
 /datum/modifier/proc/on_expire()
 	return
@@ -114,15 +127,21 @@
 
 	// If we're at this point, the mob doesn't already have it, or it does but stacking is allowed.
 	var/datum/modifier/mod = new modifier_type(src, origin)
+	if(!mod.can_apply(src))
+		qdel(mod)
+		return
 	if(expire_at)
 		mod.expire_at = world.time + expire_at
 	if(mod.on_created_text)
 		to_chat(src, mod.on_created_text)
 	modifiers.Add(mod)
+	mod.on_applied()
 	if(mod.mob_overlay_state)
 		update_modifier_visuals()
 	if(mod.icon_scale_percent)
 		update_transform()
+	if(mod.client_color)
+		update_client_color()
 
 	return mod