From d07d0ae31c0d39c526c8418e725b5dce1d120793 Mon Sep 17 00:00:00 2001
From: jordan4ibanez <jordan4ibanez@users.noreply.github.com>
Date: Thu, 15 Apr 2021 15:34:07 -0400
Subject: [PATCH] Make mobs jump properly

---
 .../mcl_mobs/api/mob_functions/ai.lua         | 42 +++++++++++++++++++
 .../mcl_mobs/api/mob_functions/movement.lua   | 12 ++++++
 2 files changed, 54 insertions(+)

diff --git a/mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua b/mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua
index 1a3066b971..a1f829d848 100644
--- a/mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua
+++ b/mods/ENTITIES/mcl_mobs/api/mob_functions/ai.lua
@@ -1,5 +1,14 @@
 local math_random = math.random
 
+local vector_multiply = vector.multiply
+
+local minetest_yaw_to_dir                   = minetest.yaw_to_dir
+local minetest_get_item_group               = minetest.get_item_group
+local minetest_get_node                     = minetest.get_node
+
+
+
+
 -- execute current state (stand, walk, run, attacks)
 -- returns true if mob has died
 local do_states = function(self, dtime)
@@ -17,6 +26,35 @@ local do_states = function(self, dtime)
 end
 
 
+
+
+
+
+--check if a mob needs to jump
+local jump_check = function(self,dtime)
+
+    local pos = self.object:get_pos()
+    pos.y = pos.y + 0.1
+    local dir = minetest_yaw_to_dir(self.yaw)
+
+    local collisionbox = self.object:get_properties().collisionbox
+	local radius = collisionbox[4] + 0.5
+
+    vector_multiply(dir, radius)
+
+
+    local test_dir = vector.add(pos,dir)
+
+    if minetest_get_item_group(minetest_get_node(test_dir).name, "solid") ~= 0 then
+        print("jump")
+        mobs.jump(self)
+    end
+end
+
+
+
+
+
 mobs.mob_step = function(self, dtime)
 
 	--do not continue if non-existent
@@ -34,6 +72,8 @@ mobs.mob_step = function(self, dtime)
 
 	do_states(self, dtime)
 
+    jump_check(self)
+
 
 	mobs.movement_rotation_lock(self)
 
@@ -201,4 +241,6 @@ mobs.mob_step = function(self, dtime)
 		end
 	end
 	]]--
+
+    self.old_velocity = self.object:get_velocity()
 end
diff --git a/mods/ENTITIES/mcl_mobs/api/mob_functions/movement.lua b/mods/ENTITIES/mcl_mobs/api/mob_functions/movement.lua
index 8fb30f76a5..72ee3824d7 100644
--- a/mods/ENTITIES/mcl_mobs/api/mob_functions/movement.lua
+++ b/mods/ENTITIES/mcl_mobs/api/mob_functions/movement.lua
@@ -51,4 +51,16 @@ mobs.get_velocity = function(self)
 	end
 
 	return 0
+end
+
+--make mobs jump
+mobs.jump = function(self, velocity)
+
+    if self.object:get_velocity().y ~= 0 or not self.old_velocity or (self.old_velocity and self.old_velocity.y > 0) then
+        return
+    end
+
+    velocity = velocity or 5
+
+    self.object:add_velocity(vector_new(0,velocity,0))    
 end
\ No newline at end of file