Enable mob drowning

mods/ENTITIES/mcl_mobs/api/api.lua

@@ -215,7 +215,7 @@ function mobs:register_mob(name, def)
 		hp_max = scale_difficulty(def.hp_max, 10, 1),
 		xp_min = def.xp_min or 1,
 		xp_max = def.xp_max or 5,
-		breath_max = def.breath_max or 15,
+		breath_max = def.breath_max or 6,
 		breathes_in_water = def.breathes_in_water or false,
 		physical = true,
 		collisionbox = collisionbox,
@@ -361,6 +361,7 @@ function mobs:register_mob(name, def)
 		burn_timer = 0,
 
 		ignores_cobwebs = def.ignores_cobwebs,
+		breath = def.breath_max or 6,
 		--end j4i stuff
 
 		-- MCL2 extensions

mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua

@@ -829,6 +829,42 @@ mobs.mob_step = function(self, dtime)
 		end
 	end
 
+	--color modifier which coincides with the pause_timer
+	if self.old_health and self.health < self.old_health then		
+		self.object:set_texture_mod("^[colorize:red:120")
+	end	
+	self.old_health = self.health
+
+
+	--mobs drowning mechanic
+	if not self.breathes_in_water then
+
+		local pos = self.object:get_pos()
+
+		pos.y = pos.y + self.eye_height
+
+		local node = minetest.get_node(pos).name
+
+		if minetest_get_item_group(node, "water") ~= 0 then
+			self.breath = self.breath - dtime
+
+			--reset breath when drowning
+			if self.breath <= 0 then
+				self.health = self.health - 4
+				self.breath = 1
+				self.pause_timer = 0.5
+			end
+
+		elseif self.breath < self.breath_max then
+			self.breath = self.breath + dtime
+			
+			--clean timer reset
+			if self.breath > self.breath_max then
+				self.breath = self.breath_max
+			end
+		end
+	end
+
 	--set mobs on fire when burned by sunlight
 	if self.ignited_by_sunlight then
 		local pos = self.object:get_pos()
@@ -850,11 +886,7 @@ mobs.mob_step = function(self, dtime)
 		end
 	end
 
-	--color modifier which coincides with the pause_timer
+	
-	if self.old_health and self.health < self.old_health then		
-		self.object:set_texture_mod("^[colorize:red:120")
-	end	
-	self.old_health = self.health
 
 	--do death logic (animation, poof, explosion, etc)
 	if self.health <= 0 then