Rainforest: Add emergent jungle tree and sapling

Height 20 to 32 nodes.
Dependent on chunksize >= 5.
Base limited to maximum altitude y = 32.
Craft sapling from 9 jungle saplings.

mods/default/README.txt

@@ -115,6 +115,7 @@ paramat (CC BY-SA 3.0):
   default_silver_sandstone_block.png -- Derived from a texture by GreenXenith (CC-BY-SA 3.0)
   default_bookshelf_slot.png -- Derived from a texture by Gambit (CC-BY-SA 3.0)
   default_marram_grass_*.png -- Derived from textures by TumeniNodes (CC-BY-SA 3.0)
+  default_emergent_jungle_sapling.png
 
 TumeniNodes (CC BY-SA 3.0):
   default_desert_cobble.png -- Derived from a texture by brunob.santos (CC BY-SA 3.0)

mods/default/crafting.lua

@@ -763,14 +763,26 @@ minetest.register_craft({
 	}
 })
 
+minetest.register_craft({
+	output = "default:emergent_jungle_sapling",
+	recipe = {
+		{"default:junglesapling", "default:junglesapling", "default:junglesapling"},
+		{"default:junglesapling", "default:junglesapling", "default:junglesapling"},
+		{"default:junglesapling", "default:junglesapling", "default:junglesapling"},
+	}
+})
+
+
 --
 -- Crafting (tool repair)
 --
+
 minetest.register_craft({
 	type = "toolrepair",
 	additional_wear = -0.02,
 })
 
+
 --
 -- Cooking recipes
 --
@@ -849,6 +861,7 @@ minetest.register_craft({
 	cooktime = 5,
 })
 
+
 --
 -- Fuels
 --
@@ -964,6 +977,12 @@ minetest.register_craft({
 	burntime = 6,
 })
 
+minetest.register_craft({
+	type = "fuel",
+	recipe = "default:emergent_jungle_sapling",
+	burntime = 7,
+})
+
 
 minetest.register_craft({
 	type = "fuel",

mods/default/mapgen.lua

@@ -1705,6 +1705,34 @@ function default.register_decorations()
 		rotation = "random",
 	})
 
+	-- Emergent jungle tree
+	-- Due to 32 node height, altitude is limited and prescence depends on chunksize
+
+	local chunksize = tonumber(minetest.get_mapgen_setting("chunksize"))
+	if chunksize >= 5 then
+		minetest.register_decoration({
+			deco_type = "schematic",
+			place_on = {"default:dirt_with_rainforest_litter"},
+			sidelen = 80,
+			noise_params = {
+				offset = 0.0,
+				scale = 0.0025,
+				spread = {x = 250, y = 250, z = 250},
+				seed = 2685,
+				octaves = 3,
+				persist = 0.7
+			},
+			biomes = {"rainforest"},
+			y_min = 1,
+			y_max = 32,
+			schematic = minetest.get_modpath("default") ..
+					"/schematics/emergent_jungle_tree.mts",
+			flags = "place_center_x, place_center_z",
+			rotation = "random",
+			place_offset_y = -4,
+		})
+	end
+
 	-- Jungle tree and log
 
 	minetest.register_decoration({

mods/default/nodes.lua

@@ -80,6 +80,7 @@ default:jungletree
 default:junglewood
 default:jungleleaves
 default:junglesapling
+default:emergent_jungle_sapling
 
 default:pine_tree
 default:pine_wood
@@ -775,6 +776,41 @@ minetest.register_node("default:junglesapling", {
 	end,
 })
 
+minetest.register_node("default:emergent_jungle_sapling", {
+	description = "Emergent Jungle Tree Sapling",
+	drawtype = "plantlike",
+	tiles = {"default_emergent_jungle_sapling.png"},
+	inventory_image = "default_emergent_jungle_sapling.png",
+	wield_image = "default_emergent_jungle_sapling.png",
+	paramtype = "light",
+	sunlight_propagates = true,
+	walkable = false,
+	on_timer = default.grow_sapling,
+	selection_box = {
+		type = "fixed",
+		fixed = {-4 / 16, -0.5, -4 / 16, 4 / 16, 7 / 16, 4 / 16}
+	},
+	groups = {snappy = 2, dig_immediate = 3, flammable = 2,
+		attached_node = 1, sapling = 1},
+	sounds = default.node_sound_leaves_defaults(),
+
+	on_construct = function(pos)
+		minetest.get_node_timer(pos):start(math.random(300, 1500))
+	end,
+
+	on_place = function(itemstack, placer, pointed_thing)
+		itemstack = default.sapling_on_place(itemstack, placer, pointed_thing,
+			"default:emergent_jungle_sapling",
+			-- minp, maxp to be checked, relative to sapling pos
+			{x = -3, y = -5, z = -3},
+			{x = 3, y = 31, z = 3},
+			-- maximum interval of interior volume check
+			4)
+
+		return itemstack
+	end,
+})
+
 
 minetest.register_node("default:pine_tree", {
 	description = "Pine Tree",

mods/default/trees.lua

@@ -85,6 +85,10 @@ function default.grow_sapling(pos)
 		minetest.log("action", "An acacia bush sapling grows into a bush at "..
 			minetest.pos_to_string(pos))
 		default.grow_acacia_bush(pos)
+	elseif node.name == "default:emergent_jungle_sapling" then
+		minetest.log("action", "An emergent jungle sapling grows into a tree at "..
+			minetest.pos_to_string(pos))
+		default.grow_new_emergent_jungle_tree(pos)
 	end
 end
 
@@ -394,6 +398,16 @@ function default.grow_new_jungle_tree(pos)
 end
 
 
+-- New emergent jungle tree
+
+function default.grow_new_emergent_jungle_tree(pos)
+	local path = minetest.get_modpath("default") ..
+		"/schematics/emergent_jungle_tree_from_sapling.mts"
+	minetest.place_schematic({x = pos.x - 3, y = pos.y - 5, z = pos.z - 3},
+		path, "random", nil, false)
+end
+
+
 -- New pine tree
 
 function default.grow_new_pine_tree(pos)