Merge pull request 'Implement basic fall damage' (#1658) from jordan4ibanez/MineClone2:mineclone5 into mineclone5

Reviewed-on: https://git.minetest.land/MineClone2/MineClone2/pulls/1658

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

@@ -187,6 +187,11 @@ local land_state_execution = function(self,dtime)
 		end
 	end
 
+	--calculate fall damage
+	if self.fall_damage then
+		mobs.calculate_fall_damage(self)
+	end
+
 	if self.state == "stand" then
 
 		--do animation

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

@@ -279,33 +279,6 @@ local falling = function(self, pos)
 		end
 	else
 
-		-- fall damage onto solid ground
-		if self.fall_damage == 1
-		and self.object:get_velocity().y == 0 then
-
-			local d = (self.old_y or 0) - self.object:get_pos().y
-
-			if d > 5 then
-
-				local add = minetest_get_item_group(self.standing_on, "fall_damage_add_percent")
-				local damage = d - 5
-				if add ~= 0 then
-					damage = damage + damage * (add/100)
-				end
-				damage = math_floor(damage)
-				if damage > 0 then
-					self.health = self.health - damage
-
-					effect(pos, 5, "mcl_particles_smoke.png", 1, 2, 2, nil)
-
-					if check_for_death(self, "fall", {type = "fall"}) then
-						return true
-					end
-				end
-			end
-
-			self.old_y = self.object:get_pos().y
-		end
 	end
 end
 

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

@@ -15,6 +15,8 @@ local vector_distance = vector.distance
 
 local table_copy = table.copy
 
+local math_abs = math.abs
+
 -- default function when mobs are blown up with TNT
 local do_tnt = function(obj, damage)
 
@@ -243,4 +245,16 @@ mobs.get_2d_distance = function(pos1,pos2)
 	pos1.y = 0
 	pos2.y = 0
 	return(vector_distance(pos1, pos2))
+end
+
+-- fall damage onto solid ground
+mobs.calculate_fall_damage = function(self)
+	if self.old_velocity and self.old_velocity.y < -7 and self.object:get_velocity().y == 0 then
+		local vel = self.object:get_velocity()
+		if vel then
+			local damage = math_abs(self.old_velocity.y + 7) * 2
+			self.pause_timer = 0.4
+			self.health = self.health - damage
+		end
+	end
 end