Allow dropper to be facing up- or downwards

mods/redstone/mcl_dropper/init.lua

@@ -1,15 +1,14 @@
-minetest.register_node("mcl_dropper:dropper", {
+--[[ This mod registers 3 nodes:
-	description = "Dropper",
+- One node for the horizontal-facing dropper (mcl_dropper:dropper)
-	tiles = {
+- One node for the upwards-facing droppers (mcl_dropper:dropper_up)
-		"default_furnace_top.png", "default_furnace_bottom.png",
+- One node for the downwards-facing droppers (mcl_dropper:dropper_down)
-		"default_furnace_side.png", "default_furnace_side.png",
+
-		"default_furnace_side.png", "mcl_dropper_dropper_front_horizontal.png"
+3 node definitions are needed because of the way the textures are defined.
-	}, 
+All node definitions share a lot of code, so this is the reason why there
-	groups = {cracky=2,container=2},
+are so many weird tables below.
-	is_ground_content = false,
+]]
-	paramtype2 = "facedir",
+
-	sounds = mcl_sounds.node_sound_stone_defaults(),
+local setup_dropper = function(pos)
-	after_place_node = function(pos)
 	local form = "size[9,8.75]"..
 	"background[-0.19,-0.25;9.41,9.49;crafting_inventory_9_slots.png]"..
 	mcl_core.inventory_header..
@@ -23,7 +22,12 @@ minetest.register_node("mcl_dropper:dropper", {
 	meta:set_string("formspec", form)
 	local inv = meta:get_inventory()
 	inv:set_size("main", 9)
-	end,
+end
+
+-- Shared core definition table
+local dropperdef = {
+	is_ground_content = false,
+	sounds = mcl_sounds.node_sound_stone_defaults(),
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
 		local meta = minetest.get_meta(pos)
 		local meta2 = meta
@@ -43,7 +47,14 @@ minetest.register_node("mcl_dropper:dropper", {
 		action_on = function (pos, node)
 			local meta = minetest.get_meta(pos)
 			local inv = meta:get_inventory()
-			local droppos = vector.subtract(pos, minetest.facedir_to_dir(node.param2))
+			local droppos
+			if node.name == "mcl_dropper:dropper" then
+				droppos  = vector.subtract(pos, minetest.facedir_to_dir(node.param2))
+			elseif node.name == "mcl_dropper:dropper_up" then
+				droppos  = {x=pos.x, y=pos.y+1, z=pos.z}
+			elseif node.name == "mcl_dropper:dropper_down" then
+				droppos  = {x=pos.x, y=pos.y-1, z=pos.z}
+			end
 			local dropnode = minetest.get_node(droppos)
 			-- Do not drop into solid nodes, unless they are containers
 			local dropnodedef = minetest.registered_nodes[dropnode.name]
@@ -75,13 +86,54 @@ minetest.register_node("mcl_dropper:dropper", {
 			end
 		end
 	}}
-})
+}
 
-minetest.register_craft({
+-- Horizontal dropper
-	output = 'mcl_dropper:dropper',
+
-	recipe = {
+local horizontal_def = table.copy(dropperdef)
-		{"mcl_core:cobble", "mcl_core:cobble", "mcl_core:cobble",},
+horizontal_def.description = "Dropper"
-		{"mcl_core:cobble", "", "mcl_core:cobble",},
+horizontal_def.after_place_node = function(pos, placer, itemstack, pointed_thing)
-		{"mcl_core:cobble", "mesecons:redstone", "mcl_core:cobble",},
+	setup_dropper(pos)
-	}
+
-})
+	-- When placed up and down, convert node to up/down dropper
+	if pointed_thing.above.y < pointed_thing.under.y then
+		minetest.swap_node(pos, {name = "mcl_dropper:dropper_down"})
+	elseif pointed_thing.above.y > pointed_thing.under.y then
+		minetest.swap_node(pos, {name = "mcl_dropper:dropper_up"})
+	end
+
+	-- Else, the normal facedir logic applies
+end
+horizontal_def.tiles = {
+	"default_furnace_top.png", "default_furnace_bottom.png",
+	"default_furnace_side.png", "default_furnace_side.png",
+	"default_furnace_side.png", "mcl_dropper_dropper_front_horizontal.png"
+}
+horizontal_def.paramtype2 = "facedir"
+horizontal_def.groups = {cracky=2,container=2}
+
+minetest.register_node("mcl_dropper:dropper", horizontal_def)
+
+-- Down dropper
+local down_def = table.copy(dropperdef)
+down_def.description = "Downwards-Facing Dropper"
+down_def.after_place_node = setup_dropper
+down_def.tiles = {
+	"default_furnace_top.png", "mcl_dropper_dropper_front_vertical.png",
+	"default_furnace_side.png", "default_furnace_side.png",
+	"default_furnace_side.png", "default_furnace_side.png"
+}
+down_def.groups = {cracky=2,container=2,not_in_creative_inventory=1}
+down_def.drop = "mcl_dropper:dropper"
+minetest.register_node("mcl_dropper:dropper_down", down_def)
+
+-- Up dropper
+-- The up dropper is almost identical to the down dropper, it only differs in textures
+up_def = table.copy(down_def)
+up_def.description = "Upwards-Facing Dropper"
+up_def.tiles = {
+	"mcl_dropper_dropper_front_vertical.png", "default_furnace_bottom.png",
+	"default_furnace_side.png", "default_furnace_side.png",
+	"default_furnace_side.png", "default_furnace_side.png"
+}
+minetest.register_node("mcl_dropper:dropper_up", up_def)