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mods/minetest_game/dungeon_loot/README.txt

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+Minetest Game mod: dungeon_loot
+===============================
+Adds randomly generated chests with some "loot" to generated dungeons,
+an API to register additional loot is provided.
+Only works if dungeons are actually enabled in mapgen flags.
+
+License information can be found in license.txt
+
+Authors of source code
+----------------------
+Originally by sfan5 (MIT)

mods/minetest_game/dungeon_loot/init.lua

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+dungeon_loot = {}
+
+dungeon_loot.CHESTS_MIN = 0 -- not necessarily in a single dungeon
+dungeon_loot.CHESTS_MAX = 2
+dungeon_loot.STACKS_PER_CHEST_MAX = 8
+
+dofile(minetest.get_modpath("dungeon_loot") .. "/loot.lua")
+dofile(minetest.get_modpath("dungeon_loot") .. "/mapgen.lua")

mods/minetest_game/dungeon_loot/license.txt

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+License of source code
+----------------------
+
+The MIT License (MIT)
+Copyright (C) 2017 sfan5
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this
+software and associated documentation files (the "Software"), to deal in the Software
+without restriction, including without limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of the Software, and to permit
+persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+
+For more details:
+https://opensource.org/licenses/MIT

mods/minetest_game/dungeon_loot/loot.lua

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+-- Loot from the `default` mod is registered here,
+-- with the rest being registered in the respective mods
+
+dungeon_loot.registered_loot = {
+	-- various items
+	{name = "default:stick", chance = 0.6, count = {3, 6}},
+	{name = "default:flint", chance = 0.4, count = {1, 3}},
+
+	-- farming / consumable
+	{name = "default:apple", chance = 0.4, count = {1, 4}},
+	{name = "default:cactus", chance = 0.4, count = {1, 4},
+		types = {"sandstone", "desert"}},
+
+	-- minerals
+	{name = "default:coal_lump", chance = 0.9, count = {1, 12}},
+	{name = "default:gold_ingot", chance = 0.5},
+	{name = "default:steel_ingot", chance = 0.4, count = {1, 6}},
+	{name = "default:mese_crystal", chance = 0.1, count = {2, 3}},
+
+	-- tools
+	{name = "default:sword_wood", chance = 0.6},
+	{name = "default:pick_stone", chance = 0.3},
+	{name = "default:axe_diamond", chance = 0.05},
+
+	-- natural materials
+	{name = "default:sand", chance = 0.8, count = {4, 32}, y = {-64, 32768},
+		types = {"normal"}},
+	{name = "default:desert_sand", chance = 0.8, count = {4, 32}, y = {-64, 32768},
+		types = {"sandstone"}},
+	{name = "default:desert_cobble", chance = 0.8, count = {4, 32},
+		types = {"desert"}},
+	{name = "default:snow", chance = 0.8, count = {8, 64}, y = {-64, 32768},
+		types = {"ice"}},
+	{name = "default:dirt", chance = 0.6, count = {2, 16}, y = {-64, 32768},
+		types = {"normal", "sandstone", "desert"}},
+	{name = "default:obsidian", chance = 0.25, count = {1, 3}, y = {-32768, -512}},
+	{name = "default:mese", chance = 0.15, y = {-32768, -512}},
+}
+
+function dungeon_loot.register(t)
+	if t.name ~= nil then
+		t = {t} -- single entry
+	end
+	for _, loot in ipairs(t) do
+		table.insert(dungeon_loot.registered_loot, loot)
+	end
+end
+
+function dungeon_loot._internal_get_loot(pos_y, dungeontype)
+	-- filter by y pos and type
+	local ret = {}
+	for _, l in ipairs(dungeon_loot.registered_loot) do
+		if l.y == nil or (pos_y >= l.y[1] and pos_y <= l.y[2]) then
+			if l.types == nil or table.indexof(l.types, dungeontype) ~= -1 then
+				table.insert(ret, l)
+			end
+		end
+	end
+	return ret
+end

mods/minetest_game/dungeon_loot/mapgen.lua

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+minetest.set_gen_notify({dungeon = true, temple = true})
+
+local function noise3d_integer(noise, pos)
+	return math.abs(math.floor(noise:get_3d(pos) * 0x7fffffff))
+end
+
+local function random_sample(rand, list, count)
+	local ret = {}
+	for n = 1, count do
+		local idx = rand:next(1, #list)
+		table.insert(ret, list[idx])
+		table.remove(list, idx)
+	end
+	return ret
+end
+
+local function find_walls(cpos, is_temple)
+	local is_wall = function(node)
+		return node.name ~= "air" and node.name ~= "ignore"
+	end
+
+	local dirs = {{x=1, z=0}, {x=-1, z=0}, {x=0, z=1}, {x=0, z=-1}}
+	local get_node = minetest.get_node
+
+	local ret = {}
+	local mindist = {x=0, z=0}
+	local min = function(a, b) return a ~= 0 and math.min(a, b) or b end
+	for _, dir in ipairs(dirs) do
+		for i = 1, 9 do -- 9 = max room size / 2
+			local pos = vector.add(cpos, {x=dir.x*i, y=0, z=dir.z*i})
+
+			-- continue in that direction until we find a wall-like node
+			local node = get_node(pos)
+			if is_wall(node) then
+				local front_below = vector.subtract(pos, {x=dir.x, y=1, z=dir.z})
+				local above = vector.add(pos, {x=0, y=1, z=0})
+
+				-- check that it:
+				--- is at least 2 nodes high (not a staircase)
+				--- has a floor
+				if is_wall(get_node(front_below)) and is_wall(get_node(above)) then
+					table.insert(ret, {pos = pos, facing = {x=-dir.x, y=0, z=-dir.z}})
+					if dir.z == 0 then
+						mindist.x = min(mindist.x, i-1)
+					else
+						mindist.z = min(mindist.z, i-1)
+					end
+				end
+				-- abort even if it wasn't a wall cause something is in the way
+				break
+			end
+		end
+	end
+
+	local biome = minetest.get_biome_data(cpos)
+	biome = biome and minetest.get_biome_name(biome.biome) or ""
+	local type = "normal"
+	if is_temple or biome:find("desert") == 1 then
+		type = "desert"
+	elseif biome:find("sandstone_desert") == 1 then
+		type = "sandstone"
+	elseif biome:find("icesheet") == 1 then
+		type = "ice"
+	end
+
+	return {
+		walls = ret,
+		size = {x=mindist.x*2, z=mindist.z*2},
+		type = type,
+	}
+end
+
+local function populate_chest(pos, rand, dungeontype)
+	--minetest.chat_send_all("chest placed at " .. minetest.pos_to_string(pos) .. " [" .. dungeontype .. "]")
+	--minetest.add_node(vector.add(pos, {x=0, y=1, z=0}), {name="default:torch", param2=1})
+
+	local item_list = dungeon_loot._internal_get_loot(pos.y, dungeontype)
+	-- take random (partial) sample of all possible items
+	local sample_n = math.min(#item_list, dungeon_loot.STACKS_PER_CHEST_MAX)
+	item_list = random_sample(rand, item_list, sample_n)
+
+	-- apply chances / randomized amounts and collect resulting items
+	local items = {}
+	for _, loot in ipairs(item_list) do
+		if rand:next(0, 1000) / 1000 <= loot.chance then
+			local itemdef = minetest.registered_items[loot.name]
+			local amount = 1
+			if loot.count ~= nil then
+				amount = rand:next(loot.count[1], loot.count[2])
+			end
+
+			if not itemdef then
+				minetest.log("warning", "Registered loot item " .. loot.name .. " does not exist")
+			elseif itemdef.tool_capabilities then
+				for n = 1, amount do
+					local wear = rand:next(0.20 * 65535, 0.75 * 65535) -- 20% to 75% wear
+					table.insert(items, ItemStack({name = loot.name, wear = wear}))
+				end
+			elseif itemdef.stack_max == 1 then
+				-- not stackable, add separately
+				for n = 1, amount do
+					table.insert(items, loot.name)
+				end
+			else
+				table.insert(items, ItemStack({name = loot.name, count = amount}))
+			end
+		end
+	end
+
+	-- place items at random places in chest
+	local inv = minetest.get_meta(pos):get_inventory()
+	local listsz = inv:get_size("main")
+	assert(listsz >= #items)
+	for _, item in ipairs(items) do
+		local index = rand:next(1, listsz)
+		if inv:get_stack("main", index):is_empty() then
+			inv:set_stack("main", index, item)
+		else
+			inv:add_item("main", item) -- space occupied, just put it anywhere
+		end
+	end
+end
+
+
+minetest.register_on_generated(function(minp, maxp, blockseed)
+	local gennotify = minetest.get_mapgen_object("gennotify")
+	local poslist = gennotify["dungeon"] or {}
+	local n_dungeons = #poslist
+	-- Add MGv6 desert temples to the list too
+	for _, entry in ipairs(gennotify["temple"] or {}) do
+		table.insert(poslist, entry)
+	end
+	if #poslist == 0 then return end
+
+	local noise = minetest.get_perlin(10115, 4, 0.5, 1)
+	local rand = PcgRandom(noise3d_integer(noise, poslist[1]))
+
+	local candidates = {}
+	-- process at most 8 rooms to keep runtime of this predictable
+	local num_process = math.min(#poslist, 8)
+	for i = 1, num_process do
+		local room = find_walls(poslist[i], i > n_dungeons)
+		-- skip small rooms and everything that doesn't at least have 3 walls
+		if math.min(room.size.x, room.size.z) >= 4 and #room.walls >= 3 then
+			table.insert(candidates, room)
+		end
+	end
+
+	local num_chests = rand:next(dungeon_loot.CHESTS_MIN, dungeon_loot.CHESTS_MAX)
+	num_chests = math.min(#candidates, num_chests)
+	local rooms = random_sample(rand, candidates, num_chests)
+
+	for _, room in ipairs(rooms) do
+		-- choose place somewhere in front of any of the walls
+		local wall = room.walls[rand:next(1, #room.walls)]
+		local v, vi -- vector / axis that runs alongside the wall
+		if wall.facing.x ~= 0 then
+			v, vi = {x=0, y=0, z=1}, "z"
+		else
+			v, vi = {x=1, y=0, z=0}, "x"
+		end
+		local chestpos = vector.add(wall.pos, wall.facing)
+		local off = rand:next(-room.size[vi]/2 + 1, room.size[vi]/2 - 1)
+		chestpos = vector.add(chestpos, vector.multiply(v, off))
+
+		if minetest.get_node(chestpos).name == "air" then
+			-- make it face inwards to the room
+			local facedir = minetest.dir_to_facedir(vector.multiply(wall.facing, -1))
+			minetest.add_node(chestpos, {name = "default:chest", param2 = facedir})
+			populate_chest(chestpos, PcgRandom(noise3d_integer(noise, chestpos)), room.type)
+		end
+	end
+end)

mods/minetest_game/dungeon_loot/mod.conf

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+name = dungeon_loot
+description = Minetest Game mod: dungeon_loot
+depends = default