Seperate mapgen from maincodes

mapgen.lua

@@ -0,0 +1,42 @@
+function make_bamboo(pos, size)
+	for y=0,size-1 do
+		local p = {x=pos.x, y=pos.y+y, z=pos.z}
+		local nn = minetest.get_node(p).name
+		if minetest.registered_nodes[nn] and
+			minetest.registered_nodes[nn].buildable_to then
+			minetest.set_node(p, {name="bamboo:bamboo"})
+		else
+			return
+		end
+	end
+end
+
+minetest.register_on_generated(function(minp, maxp, seed)
+	if maxp.y >= 2 and minp.y <= 0 then
+		-- Generate Bamboo
+		local perlin1 = minetest.get_perlin(354, 3, 0.7, 100)
+		-- Assume X and Z lengths are equal
+		local divlen = 8
+		local divs = (maxp.x-minp.x)/divlen+1;
+		for divx=0,divs-1 do
+		for divz=0,divs-1 do
+			local x0 = minp.x + math.floor((divx+0)*divlen)
+			local z0 = minp.z + math.floor((divz+0)*divlen)
+			local x1 = minp.x + math.floor((divx+1)*divlen)
+			local z1 = minp.z + math.floor((divz+1)*divlen)
+			-- Determine bamboo amount from perlin noise
+			local bamboo_amount = math.floor(perlin1:get2d({x=x0, y=z0}) * 45 - 20)
+			-- Find random positions for Bamboo based on this random
+			local pr = PseudoRandom(seed+1)
+			for i=0,bamboo_amount do
+				local x = pr:next(x0, x1)
+				local z = pr:next(z0, z1)
+				if minetest.get_node({x=x,y=1,z=z}).name == "default:dirt_with_grass" and
+						minetest.find_node_near({x=x,y=1,z=z}, 1, "default:water_source") then
+					make_bamboo({x=x,y=2,z=z}, pr:next(2, 4))
+				end
+			end
+		end
+		end
+	end
+end)