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mods/underworlds/mapgen.lua

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+-- Underworlds mapgen.lua
+-- Copyright Duane Robertson (duane@duanerobertson.com), 2017
+-- Distributed under the LGPLv2.1 (https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html)
+
+
+local DEBUG = false
+
+
+-- This tables looks up nodes that aren't already stored.
+local node = setmetatable({}, {
+	__index = function(t, k)
+		if not (t and k and type(t) == 'table') then
+			return
+		end
+
+		t[k] = minetest.get_content_id(k)
+		return t[k]
+	end
+})
+
+
+local data = {}
+local p2data = {}
+
+
+local function generate(p_minp, p_maxp, seed)
+	if not (p_minp and p_maxp and seed) then
+		return
+	end
+
+	local minp, maxp = p_minp, p_maxp
+	local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
+	if not (vm and emin and emax) then
+		return
+	end
+
+	vm:get_data(data)
+	p2data = vm:get_param2_data()
+	local heightmap
+	local area = VoxelArea:new({MinEdge = emin, MaxEdge = emax})
+	local csize = vector.add(vector.subtract(maxp, minp), 1)
+
+	local write = false
+	if not underworlds_mod.underzones then
+		return
+	end
+
+  do
+    local avg = (minp.y + maxp.y) / 2
+    for _, uz in pairs(underworlds_mod.underzones) do
+      if avg <= uz.upper_bound and avg >= uz.lower_bound then
+        write = underworlds_mod.undergen(minp, maxp, data, p2data, area, node, uz)
+      end
+    end
+  end
+
+  if write then
+    vm:set_data(data)
+    vm:set_param2_data(p2data)
+    minetest.generate_ores(vm, minp, maxp)
+
+    if DEBUG then
+      vm:set_lighting({day = 8, night = 8})
+    else
+      vm:set_lighting({day = 0, night = 0}, minp, maxp)
+      vm:calc_lighting()
+    end
+    vm:update_liquids()
+    vm:write_to_map()
+  end
+end
+
+
+if underworlds_mod.path then
+	dofile(underworlds_mod.path .. "/undergen.lua")
+end
+
+
+local function pgenerate(...)
+	local status, err = pcall(generate, ...)
+	--local status, err = true
+	--generate(...)
+	if not status then
+		print('Underworlds: Could not generate terrain:')
+		print(dump(err))
+		collectgarbage("collect")
+	end
+end
+
+
+minetest.register_on_generated(pgenerate)