Add basic part of new mapgen api

mods/CORE/mcl_init/init.lua

@@ -24,240 +24,9 @@ mcl_vars.inventory_header = ""
 -- Tool wield size
 mcl_vars.tool_wield_scale = { x = 1.8, y = 1.8, z = 1 }
 
--- Mapgen variables
-local mg_name = minetest.get_mapgen_setting("mg_name")
-local minecraft_height_limit = 256
-local superflat = mg_name == "flat" and minetest.get_mapgen_setting("mcl_superflat_classic") == "true"
-local singlenode = mg_name == "singlenode"
-
--- Calculate mapgen_edge_min/mapgen_edge_max
-mcl_vars.chunksize = math.max(1, tonumber(minetest.get_mapgen_setting("chunksize")) or 5)
-mcl_vars.MAP_BLOCKSIZE = math.max(1, minetest.MAP_BLOCKSIZE or 16)
-mcl_vars.mapgen_limit = math.max(1, tonumber(minetest.get_mapgen_setting("mapgen_limit")) or 31000)
-mcl_vars.MAX_MAP_GENERATION_LIMIT = math.max(1, minetest.MAX_MAP_GENERATION_LIMIT or 31000)
-local central_chunk_offset = -math.floor(mcl_vars.chunksize / 2)
-mcl_vars.central_chunk_offset_in_nodes = central_chunk_offset * mcl_vars.MAP_BLOCKSIZE
-mcl_vars.chunk_size_in_nodes = mcl_vars.chunksize * mcl_vars.MAP_BLOCKSIZE
-local central_chunk_min_pos = central_chunk_offset * mcl_vars.MAP_BLOCKSIZE
-local central_chunk_max_pos = central_chunk_min_pos + mcl_vars.chunk_size_in_nodes - 1
-local ccfmin = central_chunk_min_pos - mcl_vars.MAP_BLOCKSIZE -- Fullminp/fullmaxp of central chunk, in nodes
-local ccfmax = central_chunk_max_pos + mcl_vars.MAP_BLOCKSIZE
-local mapgen_limit_b = math.floor(math.min(mcl_vars.mapgen_limit, mcl_vars.MAX_MAP_GENERATION_LIMIT) / mcl_vars.MAP_BLOCKSIZE)
-local mapgen_limit_min = -mapgen_limit_b * mcl_vars.MAP_BLOCKSIZE
-local mapgen_limit_max = (mapgen_limit_b + 1) * mcl_vars.MAP_BLOCKSIZE - 1
-local numcmin = math.max(math.floor((ccfmin - mapgen_limit_min) / mcl_vars.chunk_size_in_nodes), 0) -- Number of complete chunks from central chunk
-local numcmax = math.max(math.floor((mapgen_limit_max - ccfmax) / mcl_vars.chunk_size_in_nodes), 0) -- fullminp/fullmaxp to effective mapgen limits.
-mcl_vars.mapgen_edge_min = central_chunk_min_pos - numcmin * mcl_vars.chunk_size_in_nodes
-mcl_vars.mapgen_edge_max = central_chunk_max_pos + numcmax * mcl_vars.chunk_size_in_nodes
-
-local function coordinate_to_block(x)
-	return math.floor(x / mcl_vars.MAP_BLOCKSIZE)
-end
-
-local function coordinate_to_chunk(x)
-	return math.floor((coordinate_to_block(x) - central_chunk_offset) / mcl_vars.chunksize)
-end
-
-function mcl_vars.pos_to_block(pos)
-	return {
-		x = coordinate_to_block(pos.x),
-		y = coordinate_to_block(pos.y),
-		z = coordinate_to_block(pos.z)
-	}
-end
-
-function mcl_vars.pos_to_chunk(pos)
-	return {
-		x = coordinate_to_chunk(pos.x),
-		y = coordinate_to_chunk(pos.y),
-		z = coordinate_to_chunk(pos.z)
-	}
-end
-
-local k_positive = math.ceil(mcl_vars.MAX_MAP_GENERATION_LIMIT / mcl_vars.chunk_size_in_nodes)
-local k_positive_z = k_positive * 2
-local k_positive_y = k_positive_z * k_positive_z
-
-function mcl_vars.get_chunk_number(pos) -- unsigned int
-	local c = mcl_vars.pos_to_chunk(pos)
-	return
-		(c.y + k_positive) * k_positive_y +
-		(c.z + k_positive) * k_positive_z +
-		 c.x + k_positive
-end
-
-if not superflat and not singlenode then
-	-- Normal mode
-	--[[ Realm stacking (h is for height)
-	- Overworld (h>=256)
-	- Void (h>=1000)
-	- Realm Barrier (h=11), to allow escaping the End
-	- End (h>=256)
-	- Void (h>=1000)
-	- Nether (h=128)
-	- Void (h>=1000)
-	]]
-
-	-- Overworld
-	mcl_vars.mg_overworld_min = -62
-	mcl_vars.mg_overworld_max_official = mcl_vars.mg_overworld_min + minecraft_height_limit
-	mcl_vars.mg_bedrock_overworld_min = mcl_vars.mg_overworld_min
-	mcl_vars.mg_bedrock_overworld_max = mcl_vars.mg_bedrock_overworld_min + 4
-	mcl_vars.mg_lava_overworld_max = mcl_vars.mg_overworld_min + 10
-	mcl_vars.mg_lava = true
-	mcl_vars.mg_bedrock_is_rough = true
-
-elseif singlenode then
-	mcl_vars.mg_overworld_min = -66
-	mcl_vars.mg_overworld_max_official = mcl_vars.mg_overworld_min + minecraft_height_limit
-	mcl_vars.mg_bedrock_overworld_min = mcl_vars.mg_overworld_min
-	mcl_vars.mg_bedrock_overworld_max = mcl_vars.mg_bedrock_overworld_min
-	mcl_vars.mg_lava = false
-	mcl_vars.mg_lava_overworld_max = mcl_vars.mg_overworld_min
-	mcl_vars.mg_bedrock_is_rough = false
-else
-	-- Classic superflat
-	local ground = minetest.get_mapgen_setting("mgflat_ground_level")
-	ground = tonumber(ground)
-	if not ground then
-		ground = 8
-	end
-	mcl_vars.mg_overworld_min = ground - 3
-	mcl_vars.mg_overworld_max_official = mcl_vars.mg_overworld_min + minecraft_height_limit
-	mcl_vars.mg_bedrock_overworld_min = mcl_vars.mg_overworld_min
-	mcl_vars.mg_bedrock_overworld_max = mcl_vars.mg_bedrock_overworld_min
-	mcl_vars.mg_lava = false
-	mcl_vars.mg_lava_overworld_max = mcl_vars.mg_overworld_min
-	mcl_vars.mg_bedrock_is_rough = false
-end
-
-mcl_vars.mg_overworld_max = mcl_vars.mapgen_edge_max
-
--- The Nether (around Y = -29000)
-mcl_vars.mg_nether_min = -29067 -- Carefully chosen to be at a mapchunk border
-mcl_vars.mg_nether_max = mcl_vars.mg_nether_min + 128
-mcl_vars.mg_bedrock_nether_bottom_min = mcl_vars.mg_nether_min
-mcl_vars.mg_bedrock_nether_top_max = mcl_vars.mg_nether_max
-if not superflat then
-	mcl_vars.mg_bedrock_nether_bottom_max = mcl_vars.mg_bedrock_nether_bottom_min + 4
-	mcl_vars.mg_bedrock_nether_top_min = mcl_vars.mg_bedrock_nether_top_max - 4
-	mcl_vars.mg_lava_nether_max = mcl_vars.mg_nether_min + 31
-else
-	-- Thin bedrock in classic superflat mapgen
-	mcl_vars.mg_bedrock_nether_bottom_max = mcl_vars.mg_bedrock_nether_bottom_min
-	mcl_vars.mg_bedrock_nether_top_min = mcl_vars.mg_bedrock_nether_top_max
-	mcl_vars.mg_lava_nether_max = mcl_vars.mg_nether_min + 2
-end
-if mg_name == "flat" then
-	if superflat then
-		mcl_vars.mg_flat_nether_floor = mcl_vars.mg_bedrock_nether_bottom_max + 4
-		mcl_vars.mg_flat_nether_ceiling = mcl_vars.mg_bedrock_nether_bottom_max + 52
-	else
-		mcl_vars.mg_flat_nether_floor = mcl_vars.mg_lava_nether_max + 4
-		mcl_vars.mg_flat_nether_ceiling = mcl_vars.mg_lava_nether_max + 52
-	end
-end
-
--- The End (surface at ca. Y = -27000)
-mcl_vars.mg_end_min = -27073 -- Carefully chosen to be at a mapchunk border
-mcl_vars.mg_end_max_official = mcl_vars.mg_end_min + minecraft_height_limit
-mcl_vars.mg_end_max = mcl_vars.mg_overworld_min - 2000
-mcl_vars.mg_end_platform_pos = { x = 100, y = mcl_vars.mg_end_min + 74, z = 0 }
-
--- Realm barrier used to safely separate the End from the void below the Overworld
-mcl_vars.mg_realm_barrier_overworld_end_max = mcl_vars.mg_end_max
-mcl_vars.mg_realm_barrier_overworld_end_min = mcl_vars.mg_end_max - 11
-
--- Use MineClone 2-style dungeons
-mcl_vars.mg_dungeons = true
-
 -- Set default stack sizes
 minetest.nodedef_default.stack_max = 64
 minetest.craftitemdef_default.stack_max = 64
 
 -- Set random seed for all other mods (Remember to make sure no other mod calls this function)
 math.randomseed(os.time())
-
-local chunks = {} -- intervals of chunks generated
-function mcl_vars.add_chunk(pos)
-	local n = mcl_vars.get_chunk_number(pos) -- unsigned int
-	local prev
-	for i, d in pairs(chunks) do
-		if n <= d[2] then -- we've found it
-			if (n == d[2]) or (n >= d[1]) then return end -- already here
-			if n == d[1]-1 then -- right before:
-				if prev and (prev[2] == n-1) then
-					prev[2] = d[2]
-					table.remove(chunks, i)
-					return
-				end
-				d[1] = n
-				return
-			end
-			if prev and (prev[2] == n-1) then --join to previous
-				prev[2] = n
-				return
-			end
-			table.insert(chunks, i, {n, n}) -- insert new interval before i
-			return
-		end
-		prev = d
-	end
-	chunks[#chunks+1] = {n, n}
-end
-function mcl_vars.is_generated(pos)
-	local n = mcl_vars.get_chunk_number(pos) -- unsigned int
-	for i, d in pairs(chunks) do
-		if n <= d[2] then
-			return (n >= d[1])
-		end
-	end
-	return false
-end
-
--- "Trivial" (actually NOT) function to just read the node and some stuff to not just return "ignore", like mt 5.4 does.
--- p: Position, if it's wrong, {name="error"} node will return.
--- force: optional (default: false) - Do the maximum to still read the node within us_timeout.
--- us_timeout: optional (default: 244 = 0.000244 s = 1/80/80/80), set it at least to 3000000 to let mapgen to finish its job.
---
--- returns node definition, eg. {name="air"}. Unfortunately still can return {name="ignore"}.
-function mcl_vars.get_node(p, force, us_timeout)
-	-- check initial circumstances
-	if not p or not p.x or not p.y or not p.z then return {name="error"} end
-
-	-- try common way
-	local node = minetest.get_node(p)
-	if node.name ~= "ignore" then
-		return node
-	end
-
-	-- copy table to get sure it won't changed by other threads
-	local pos = {x=p.x,y=p.y,z=p.z}
-
-	-- try LVM
-	minetest.get_voxel_manip():read_from_map(pos, pos)
-	node = minetest.get_node(pos)
-	if node.name ~= "ignore" or not force then
-		return node
-	end
-
-	-- all ways failed - need to emerge (or forceload if generated)
-	local us_timeout = us_timeout or 244
-	if mcl_vars.is_generated(pos) then
-		minetest.chat_send_all("IMPOSSIBLE! Please report this to MCL2 issue tracker!")
-		minetest.forceload_block(pos)
-	else
-		minetest.emerge_area(pos, pos)
-	end
-
-	local t = minetest.get_us_time()
-
-	node = minetest.get_node(pos)
-
-	while (not node or node.name == "ignore") and (minetest.get_us_time() - t < us_timeout) do
-		node = minetest.get_node(pos)
-	end
-
-	return node
-	-- it still can return "ignore", LOL, even if force = true, but only after time out
-end

mods/CORE/mcl_mapgen/API.md

@@ -0,0 +1,100 @@
+# mcl_mapgen
+============
+Helps to avoid problems caused by 'chunk-in-shell' feature of mapgen.cpp.
+It also queues your generators to run them in proper order:
+
+### mcl_mapgen.register_on_generated(lvm_callback_function, order_number)
+=========================================================================
+Replacement of engine API function `minetest.register_on_generated(function(vm_context))`
+It is still unsafe. Cavegen part can and will overwrite outer 1-block layer of the chunk which is expected to be generated.
+Nodes marked as `is_ground_content` could be overwritten. Air and water are usually 'ground content' too.
+For Minetest 5.4 it doesn't recommended to place blocks within lvm callback function.
+See https://git.minetest.land/MineClone2/MineClone2/issues/1395
+	`lvm_callback_function`: chunk callback LVM function definition:
+		`function(vm_context)`:
+			`vm_context` will pass into next lvm callback function from the queue!
+			`vm_context`: a table which already contains some LVM data as the fields, and some of them can be added in your lvm callback function:
+				`vm`: curent voxel manipulator object itself;
+				`chunkseed`: seed of this mapchunk;
+				`minp` & `maxp`: minimum and maximum chunk position;
+				`emin` & `emax`: minimum and maximum chunk position WITH SHELL AROUND IT;
+				`area`: voxel area, can be helpful to access data;
+				`data`: LVM buffer data array, data loads into it before the callbacks;
+				`write`: set it to true in your lvm callback functionm, if you changed `data` and want to write it;
+				`param2_data`: LVM buffer data array of `param2`, !NO ANY DATA LOADS INTO IT BEFORE THE CALLBACKS! - you load it yourself:
+					`vm_context.param2_data = vm_context.param2_data or vm_context.vm:get_param2_data(vm_context.lvm_param2_buffer)`
+				`write_param2`: set it to true in your lvm callback function, if you used `param2_data` and want to write it;
+				`light`: LVM buffer data array of light, !NO ANY DATA LOADS INTO IT BEFORE THE CALLBACKS! - you load it yourself:
+					`vm_context.light = vm_context.light or vm_context.vm.get_light_data(vm_context.lvm_light_buffer)`
+				`write_light`: set it to true in your lvm callback function, if you used `light` and want to write it;
+				`lvm_param2_buffer`: static `param2` buffer pointer, used to load `param2_data` array;
+				`shadow`: set it to false to disable shadow propagation;
+				`heightmap`: mapgen object contanting y coordinates of ground level,
+					!NO ANY DATA LOADS INTO IT BEFORE THE CALLBACKS! - load it yourself:
+					`vm_context.heightmap = vm_context.heightmap or minetest.get_mapgen_object('heightmap')`
+				`biomemap`: mapgen object contanting biome IDs of nodes,
+					!NO ANY DATA LOADS INTO IT BEFORE THE CALLBACKS! - load it yourself:
+					`vm_context.biomemap = vm_context.biomemap or minetest.get_mapgen_object('biomemap')`
+				`heatmap`: mapgen object contanting temperature values of nodes,
+					!NO ANY DATA LOADS INTO IT BEFORE THE CALLBACKS! - load it yourself:
+					`vm_context.heatmap = vm_context.heatmap or minetest.get_mapgen_object('heatmap')`
+				`humiditymap`: mapgen object contanting humidity values of nodes,
+					!NO ANY DATA LOADS INTO IT BEFORE THE CALLBACKS! - load it yourself:
+					`vm_context.humiditymap = vm_context.humiditymap or minetest.get_mapgen_object('humiditymap')`
+				`gennotify`: mapgen object contanting mapping table of structures, see Minetest Lua API for explanation,
+					!NO ANY DATA LOADS INTO IT BEFORE THE CALLBACKS! - load it yourself:
+					`vm_context.gennotify = vm_context.gennotify or minetest.get_mapgen_object('gennotify')`
+	`order_number` (optional): the less, the earlier,
+		e.g. `mcl_mapgen.order.BUILDINGS` or `mcl_mapgen.order.LARGE_BUILDINGS`
+
+### mcl_mapgen.register_mapgen_block_lvm(lvm_callback_function, order_number)
+=============================================================================
+Registers lvm callback function to be called when current block (usually 16x16x16 nodes) generation is REALLY 100% finished.
+`vm_context` passes into lvm callback function.
+	`lvm_callback_function`: the block callback LVM function definition - same as for chunks - see definition example above;
+	`order_number` (optional): the less, the earlier,
+		e.g. `mcl_mapgen.order.BUILDINGS` or `mcl_mapgen.order.LARGE_BUILDINGS`
+
+### mcl_mapgen.register_mapgen_block(node_callback_function, order_number)
+==========================================================================
+Registers node_callback function to be called when current block (usually 16x16x16 nodes) generation is REALLY 100% finished.
+	`node_callback_function`: node callback function definition:
+		`function(minp, maxp, seed)`:
+			`minp` & `maxp`: minimum and maximum block position;
+			`seed`: seed of this mapblock;
+	`order_number` (optional): the less, the earlier,
+		e.g. `mcl_mapgen.order.BUILDINGS` or `mcl_mapgen.order.LARGE_BUILDINGS`
+
+### mcl_mapgen.register_mapgen(callback_function, order_number)
+===============================================================
+Registers callback function to be called when current chunk generation is REALLY 100% finished.
+For LVM it's the most frustrating function from this mod.
+It can't provide you access to mapgen objects. They are probably gone long ago.
+Don't use it for accessing mapgen objects please.
+To use VM you have to run `vm_context.vm = mcl_mapgen.get_voxel_manip(vm_context.emin, vm_context.emax)`.
+	`callback_function`: callback function definition:
+		`function(minp, maxp, seed, vm_context)`:
+			`minp` & `maxp`: minimum and maximum block position;
+			`seed`: seed of this mapblock;
+			`vm_context`: a table - see description above.
+	`order_number` (optional): the less, the earlier.
+
+### mcl_mapgen.register_mapgen_lvm(lvm_callback_function, order_number)
+=======================================================================
+Registers lvm callback function to be called when current chunk generation is REALLY 100% finished.
+It's the most frustrating function from this mod. It can't provide you access to mapgen objects. They are probably gone long ago.
+Don't use it for accessing mapgen objects please.
+`vm_context` passes into lvm callback function.
+	`lvm_callback_function`: the block callback LVM function definition - same as above;
+	`order_number` (optional): the less, the earlier.
+
+### mcl_mapgen.get_far_node(pos)
+================================
+Returns node if it is generated, otherwise returns `{name = "ignore"}`.
+
+## Constants:
+
+* `mcl_mapgen.EDGE_MIN`, `mcl_mapgen.EDGE_MAX` - world edges, min & max.
+* `mcl_mapgen.seed`, `mcl_mapgen.name` - mapgen seed & name.
+* `mcl_mapgen.v6`, `mcl_mapgen.superflat`, `mcl_mapgen.singlenode` - is mapgen v6, superflat, singlenode.
+* `mcl_mapgen.normal` is mapgen normal (not superflat or singlenode).

mods/CORE/mcl_mapgen/init.lua

@@ -0,0 +1,498 @@
+mcl_mapgen = {}
+
+local order = { -- mcl_mapgen.order...
+	DEFAULT		=    5000,
+	CHORUS		=  100000,
+	BUILDINGS	=  200000,
+	VILLAGES	=  900000,
+	DUNGEONS	=  950000,
+	STRONGHOLDS	=  999999,
+	OCEAN_MONUMENT	= 1000000,
+	LARGE_BUILDINGS	= 2000000,
+}
+
+local math_floor		= math.floor
+local math_max			= math.max
+local minetest_get_node		= minetest.get_node
+local minetest_get_voxel_manip	= minetest.get_voxel_manip
+local minetest_log		= minetest.log
+local minetest_pos_to_string	= minetest.pos_to_string
+
+-- Calculate mapgen_edge_min/mapgen_edge_max
+mcl_mapgen.CS		= math_max(1, tonumber(minetest.get_mapgen_setting("chunksize"))	or 5)
+mcl_mapgen.BS		= math_max(1, core.MAP_BLOCKSIZE					or 16)
+mcl_mapgen.LIMIT	= math_max(1, tonumber(minetest.get_mapgen_setting("mapgen_limit"))	or 31000)
+mcl_mapgen.MAX_LIMIT	= math_max(1, core.MAX_MAP_GENERATION_LIMIT				or 31000) -- might be set to 31000 or removed, see https://github.com/minetest/minetest/issues/10428
+mcl_mapgen.OFFSET	= - math_floor(mcl_mapgen.CS / 2)
+mcl_mapgen.OFFSET_NODES	= mcl_mapgen.OFFSET * mcl_mapgen.BS
+mcl_mapgen.CS_NODES	= mcl_mapgen.CS * mcl_mapgen.BS
+
+local central_chunk_min_pos = mcl_mapgen.OFFSET * mcl_mapgen.BS
+local central_chunk_max_pos = central_chunk_min_pos + mcl_mapgen.CS_NODES - 1
+
+local ccfmin = central_chunk_min_pos - mcl_mapgen.BS -- Fullminp/fullmaxp of central chunk, in nodes
+local ccfmax = central_chunk_max_pos + mcl_mapgen.BS
+
+local mapgen_limit_b = math_floor(math.min(mcl_mapgen.LIMIT, mcl_mapgen.MAX_LIMIT) / mcl_mapgen.BS)
+local mapgen_limit_min = - mapgen_limit_b	* mcl_mapgen.BS
+local mapgen_limit_max =  (mapgen_limit_b + 1)	* mcl_mapgen.BS - 1
+
+local numcmin = math_max(math_floor((ccfmin - mapgen_limit_min) / mcl_mapgen.CS_NODES), 0) -- Number of complete chunks from central chunk
+local numcmax = math_max(math_floor((mapgen_limit_max - ccfmax) / mcl_mapgen.CS_NODES), 0) -- fullminp/fullmaxp to effective mapgen limits.
+
+mcl_mapgen.EDGE_MIN = central_chunk_min_pos - numcmin * mcl_mapgen.CS_NODES
+mcl_mapgen.EDGE_MAX = central_chunk_max_pos + numcmax * mcl_mapgen.CS_NODES
+
+minetest_log("action", "[mcl_mapgen] World edges: mcl_mapgen.EDGE_MIN = " .. tostring(mcl_mapgen.EDGE_MIN) .. ", mcl_mapgen.EDGE_MAX = " .. tostring(mcl_mapgen.EDGE_MAX))
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
+
+-- Mapgen variables
+local overworld, end_, nether = {}, {}, {}
+local seed = minetest.get_mapgen_setting("seed")
+mcl_mapgen.seed = seed
+mcl_mapgen.name = minetest.get_mapgen_setting("mg_name")
+mcl_mapgen.v6 = mcl_mapgen.name == "v6"
+mcl_mapgen.superflat = mcl_mapgen.name == "flat" and minetest.get_mapgen_setting("mcl_superflat_classic") == "true"
+mcl_mapgen.singlenode = mcl_mapgen.name == "singlenode"
+mcl_mapgen.normal = not mcl_mapgen.superflat and not mcl_mapgen.singlenode
+local superflat, singlenode, normal = mcl_mapgen.superflat, mcl_mapgen.singlenode, mcl_mapgen.normal
+
+minetest_log("action", "[mcl_mapgen] Mapgen mode: " .. (normal and "normal" or (superflat and "superflat" or "singlenode")))
+----------------------------------------------------------------------------------------------------------------------------
+
+-- Generator queues
+local queue_unsafe_engine = {}
+local queue_chunks_nodes  = {}
+local queue_chunks_lvm    = {}
+local queue_blocks_nodes  = {}
+local queue_blocks_lvm    = {}
+
+-- Requirements. 0 means 'none', greater than 0 means 'required'
+local block                    = 0
+local queue_blocks_lvm_counter = 0
+local lvm_chunk                = 0
+local param2                   = 0
+local nodes_block              = 0
+local nodes_chunk              = 0
+local safe_functions           = 0
+
+local BS, CS = mcl_mapgen.BS, mcl_mapgen.CS -- Mapblock size (in nodes), Mapchunk size (in blocks)
+local LAST_BLOCK, LAST_NODE = CS - 1, BS - 1 -- First mapblock in chunk (node in mapblock) has number 0, last has THIS number. It's for runtime optimization
+local offset = mcl_mapgen.OFFSET -- Central mapchunk offset (in blocks)
+local CS_NODES = mcl_mapgen.CS_NODES -- 80
+
+local CS_3D = CS * CS * CS
+
+local DEFAULT_ORDER = order.DEFAULT
+
+function mcl_mapgen.register_on_generated(callback_function, order)
+	queue_unsafe_engine[#queue_unsafe_engine+1] = {i = order or DEFAULT_ORDER, f = callback_function}
+	table.sort(queue_unsafe_engine, function(a, b) return (a.i <= b.i) end)
+end
+function mcl_mapgen.register_mapgen(callback_function, order)
+	nodes_chunk = nodes_chunk + 1
+	safe_functions = safe_functions + 1
+	queue_chunks_nodes[nodes_chunk] = {i = order or DEFAULT_ORDER, f = callback_function}
+	table.sort(queue_chunks_nodes, function(a, b) return (a.i <= b.i) end)
+end
+function mcl_mapgen.register_mapgen_lvm(callback_function, order)
+	lvm_chunk = lvm_chunk + 1
+	safe_functions = safe_functions + 1
+	queue_chunks_lvm[lvm_chunk] = {i = order or DEFAULT_ORDER, f = callback_function}
+	table.sort(queue_chunks_lvm, function(a, b) return (a.i <= b.i) end)
+end
+function mcl_mapgen.register_mapgen_block(callback_function, order)
+	block = block + 1
+	nodes_block = nodes_block + 1
+	safe_functions = safe_functions + 1
+	queue_blocks_nodes[nodes_block] = {i = order or DEFAULT_ORDER, f = callback_function}
+	table.sort(queue_blocks_nodes, function(a, b) return (a.i <= b.i) end)
+end
+function mcl_mapgen.register_mapgen_block_lvm(callback_function, order)
+	block = block + 1
+	queue_blocks_lvm_counter = queue_blocks_lvm_counter + 1
+	safe_functions = safe_functions + 1
+	queue_blocks_lvm[queue_blocks_lvm_counter] = {order = order or DEFAULT_ORDER, callback_function = callback_function}
+	table.sort(queue_blocks_lvm, function(a, b) return (a.order <= b.order) end)
+end
+
+local storage = minetest.get_mod_storage()
+local blocks = minetest.deserialize(storage:get_string("mapgen_blocks") or "return {}") or {}
+local chunks = minetest.deserialize(storage:get_string("mapgen_chunks") or "return {}") or {}
+minetest.register_on_shutdown(function()
+	storage:set_string("mapgen_chunks", minetest.serialize(chunks))
+	storage:set_string("mapgen_blocks", minetest.serialize(blocks))
+end)
+
+local vm_context -- here will be many references and flags, like: param2, light_data, heightmap, biomemap, heatmap, humiditymap, gennotify, write_lvm, write_param2, shadow
+local data, param2_data, light, area
+local current_blocks = {}
+local current_chunks = {}
+local lvm_buffer, lvm_param2_buffer, lvm_light_buffer = {}, {}, {} -- Static buffer pointers
+
+minetest.register_on_generated(function(minp, maxp, chunkseed)
+	local minp, maxp, chunkseed = minp, maxp, chunkseed
+	local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
+	minetest_log("warning", "[mcl_mapgen] New_chunk=" .. minetest_pos_to_string(minp) .. "..." .. minetest_pos_to_string(maxp) .. ", shell=" .. minetest_pos_to_string(emin) .. "..." .. minetest_pos_to_string(emax) .. ", chunkseed=" .. tostring(chunkseed))
+
+	data = vm:get_data(lvm_buffer)
+	area = VoxelArea:new({MinEdge=emin, MaxEdge=emax})
+	vm_context = {
+		data              = data,
+		param2_data       = param2_data,
+                light             = light,
+		area              = area,
+		lvm_buffer        = lvm_buffer,
+		lvm_param2_buffer = lvm_param2_buffer,
+		lvm_light_buffer  = lvm_light_buffer,
+		vm                = vm,
+		emin              = emin,
+		emax              = emax,
+		minp              = minp,
+		maxp              = maxp,
+		chunkseed         = chunkseed,
+	}
+
+	if safe_functions > 0 then
+		local x0, y0, z0 = minp.x, minp.y, minp.z
+		local bx0, by0, bz0 = math_floor(x0/BS), math_floor(y0/BS), math_floor(z0/BS)
+		local bx1, by1, bz1 = bx0 + LAST_BLOCK, by0 + LAST_BLOCK, bz0 + LAST_BLOCK -- only for entire chunk check
+
+		-- Keep `chunkseed` in `chunks[cx][cy][cz].seed` for further safe usage:
+		local cx0, cy0, cz0 = math_floor((bx0-offset)/CS), math_floor((by0-offset)/CS), math_floor((bz0-offset)/CS)
+		if not chunks[cx0] then chunks[cx0] = {} end
+		if not chunks[cx0][cy0] then chunks[cx0][cy0] = {} end
+		if not chunks[cx0][cy0][cz0] then
+			chunks[cx0][cy0][cz0] = {seed = chunkseed, counter = 0}
+		else
+			chunks[cx0][cy0][cz0].seed = chunkseed
+		end
+
+		local x1, y1, z1, x2, y2, z2 = emin.x, emin.y, emin.z, emax.x, emax.y, emax.z
+		local x, y, z = x1, y1, z1 -- iterate 7x7x7 mapchunk, {x,y,z} - first node pos. of mapblock
+		local bx, by, bz -- block coords (in blocs)
+		local box, boy, boz -- block offsets in chunks (in blocks)
+		while x < x2 do
+			bx = math_floor(x/BS)
+			local block_pos_offset_removed = bx - offset
+			local cx = math_floor(block_pos_offset_removed / CS)
+			box = block_pos_offset_removed % CS
+			if not blocks[bx] then blocks[bx]={} end
+
+			-- We don't know how many calls, including this one, will overwrite this block content!
+			-- Start calculating it with `total_mapgen_block_writes_through_x` variable.
+			-- It can be `8 or less`, if we (speaking of `x` axis) are on chunk edge now,
+			-- or it can be `4 or less` - if we are in the middle of the chunk by `x` axis:
+
+			local total_mapgen_block_writes_through_x = (box > 0 and box < LAST_BLOCK) and 4 or 8
+			while y < y2 do
+				by = math_floor(y/BS)
+				block_pos_offset_removed = by - offset
+				local cy = math_floor(block_pos_offset_removed / CS)
+				boy = block_pos_offset_removed % CS
+				if not blocks[bx][by] then blocks[bx][by]={} end
+
+				-- Here we just divide `total_mapgen_block_writes_through_x` by 2,
+				-- if we are (speaking of `y` axis now) in the middle of the chunk now.
+				-- Or we don't divide it, if not.
+				-- So, basing on `total_mapgen_block_writes_through_x`,
+				--- we calculate `total_mapgen_block_writes_through_y` this way:
+
+				local total_mapgen_block_writes_through_y = (boy > 0 and boy < LAST_BLOCK) and math_floor(total_mapgen_block_writes_through_x / 2) or total_mapgen_block_writes_through_x
+				while z < z2 do
+					bz = math_floor(z/BS)
+					block_pos_offset_removed = bz - offset
+					local cz = math_floor(block_pos_offset_removed / CS)
+					boz = block_pos_offset_removed % CS
+
+					-- Now we do absolutely the same for `z` axis, basing on our previous result
+					-- from `total_mapgen_block_writes_through_y` variable.
+					-- And our final result is in `total_mapgen_block_writes`.
+					-- It can be still 8, derived from `x` calculation, but it can be less!
+					-- It can be even 1, if we are in safe 3x3x3 area of mapchunk:
+
+					local total_mapgen_block_writes = (boz > 0 and boz < LAST_BLOCK) and math_floor(total_mapgen_block_writes_through_y / 2) or total_mapgen_block_writes_through_y
+
+					-- Get current number of writes from the table, or just set it to 1, if accessing first time:
+
+					local current_mapgen_block_writes = blocks[bx][by][bz] and (blocks[bx][by][bz] + 1) or 1
+
+					-- And compare:
+
+					if current_mapgen_block_writes == total_mapgen_block_writes then
+						-- this block shouldn't be overwritten anymore, no need to keep it in memory
+						blocks[bx][by][bz] = nil
+						if not chunks[cx] then chunks[cx] = {} end
+						if not chunks[cx][cy] then chunks[cx][cy] = {} end
+						if not chunks[cx][cy][cz] then
+							if not chunks[cx][cy][cz] then chunks[cx][cy][cz] = {counter = 1} end
+						else
+							chunks[cx][cy][cz].counter = chunks[cx][cy][cz].counter + 1
+							if chunks[cx][cy][cz].counter >= CS_3D then
+								current_chunks[#current_chunks+1] = { x = cx, y = cy, z = cz, s = chunks[cx][cy][cz].seed }
+								-- this chunk shouldn't be overwritten anymore, no need to keep it in memory
+								chunks[cx][cy][cz] = nil
+								if next(chunks[cx][cy]) == nil then chunks[cx][cy] = nil end
+								if next(chunks[cx]) == nil then chunks[cx] = nil end
+							end
+						end
+						local blockseed = seed + bx * 7 + by * 243 + bz * 11931
+						if queue_blocks_lvm_counter > 0 then
+							vm_context.blockseed = blockseed
+							vm_context.minp, vm_context.maxp = {x=x, y=y, z=z}, {x=x+LAST_NODE, y=y+LAST_NODE, z=z+LAST_NODE}
+							for _, v in pairs(queue_blocks_lvm) do
+								v.callback_function(vm_context)
+							end
+						end
+						if nodes_block > 0 then
+							current_blocks[#current_blocks+1] = { minp = {x=x, y=y, z=z}, maxp = {x=x+LAST_NODE, y=y+LAST_NODE, z=z+LAST_NODE}, seed = blockseed }
+						end
+					else
+						blocks[bx][by][bz] = current_mapgen_block_writes
+					end
+					z = z + BS
+				end
+				if next(blocks[bx][by]) == nil then blocks[bx][by] = nil end
+				z = z1
+				y = y + BS
+			end
+			if next(blocks[bx]) == nil then blocks[bx] = nil end
+			y = y1
+			x = x + BS
+		end
+	end
+
+	if #queue_unsafe_engine > 0 then
+		for _, v in pairs(queue_unsafe_engine) do
+			v.f(vm_context)
+		end
+		if vm_context.write then
+			vm:set_data(data)
+		end
+		if vm_context.write_param2 then
+			vm:set_param2_data(vm_context.param2_data)
+		end
+		if vm_context.write_light then
+			vm:set_light_data(light)
+		end
+		if vm_context.write or vm_context.write_param2 or vm_context.write_light then
+			vm:calc_lighting(minp, maxp, (vm_context.shadow ~= nil) or true) -- TODO: check boundaries
+			vm:write_to_map()
+			vm:update_liquids()
+		elseif vm_context.calc_lighting then
+			vm:calc_lighting(minp, maxp, (vm_context.shadow ~= nil) or true)
+		end
+	end
+
+	for i, b in pairs(current_chunks) do
+		local cx, cy, cz, seed = b.x, b.y, b.z, b.s
+		local bx, by, bz = cx * CS + offset, cy * CS + offset, cz * CS + offset
+		local x, y, z = bx * BS, by * BS, bz * BS
+		local minp = {x = x, y = y, z = z}
+		local maxp = {x = x + CS_NODES - 1, y = y + CS_NODES - 1, z = z + CS_NODES - 1}
+		area = VoxelArea:new({MinEdge=minp, MaxEdge=maxp})
+		vm_context = {
+			data              = data,
+			param2_data       = param2_data,
+	                light             = light,
+			area              = area,
+			lvm_buffer        = lvm_buffer,
+			lvm_param2_buffer = lvm_param2_buffer,
+			lvm_light_buffer  = lvm_light_buffer,
+			emin              = minp,
+			emax              = maxp,
+			minp              = minp,
+			maxp              = maxp,
+			chunkseed         = seed,
+		}
+		for _, v in pairs(queue_chunks_lvm) do
+			vm_context = v.f(vm_context)
+		end
+		for _, v in pairs(queue_chunks_nodes) do
+			v.f(minp, maxp, seed, vm_context)
+		end
+		if vm_context.write or vm_context.write_param2 or vm_context.write_light then
+			if vm_context.write then
+				vm:set_data(data)
+			end
+			if vm_context.write_param2 then
+				vm:set_param2_data(param2_data)
+			end
+			if vm_context.write_light then
+				vm:set_light_data(light)
+			end
+			-- caused error from torches (?)
+			-- vm:calc_lighting(minp, maxp, vm_context.shadow or true)
+			vm:write_to_map()
+			vm:update_liquids()
+		elseif vm_context.calc_lighting then
+			vm:calc_lighting(minp, maxp, (vm_context.shadow ~= nil) or true)
+		end
+		current_chunks[i] = nil
+	end
+
+	for i, b in pairs(current_blocks) do
+		for _, v in pairs(queue_blocks_nodes) do
+			v.f(b.minp, b.maxp, b.seed)
+		end
+		current_blocks[i] = nil
+	end
+end)
+
+minetest.register_on_generated = mcl_mapgen.register_chunk_generator
+
+function mcl_mapgen.get_far_node(p)
+	local p = p
+	local node = minetest_get_node(p)
+	if node.name ~= "ignore" then return node end
+	minetest_get_voxel_manip():read_from_map(p, p)
+	return minetest_get_node(p)
+end
+
+local function coordinate_to_block(x)
+	return math_floor(x / BS)
+end
+
+local function coordinate_to_chunk(x)
+	return math_floor((coordinate_to_block(x) - offset) / CS)
+end
+
+function mcl_mapgen.pos_to_block(pos)
+	return {
+		x = coordinate_to_block(pos.x),
+		y = coordinate_to_block(pos.y),
+		z = coordinate_to_block(pos.z)
+	}
+end
+
+function mcl_mapgen.pos_to_chunk(pos)
+	return {
+		x = coordinate_to_chunk(pos.x),
+		y = coordinate_to_chunk(pos.y),
+		z = coordinate_to_chunk(pos.z)
+	}
+end
+
+local k_positive = math.ceil(mcl_mapgen.MAX_LIMIT / mcl_mapgen.CS_NODES)
+local k_positive_z = k_positive * 2
+local k_positive_y = k_positive_z * k_positive_z
+
+function mcl_mapgen.get_chunk_number(pos) -- unsigned int
+	local c = mcl_mapgen.pos_to_chunk(pos)
+	return
+		(c.y + k_positive) * k_positive_y +
+		(c.z + k_positive) * k_positive_z +
+		 c.x + k_positive
+end
+
+mcl_mapgen.minecraft_height_limit = 256
+
+mcl_mapgen.bedrock_is_rough = normal
+
+--[[ Realm stacking (h is for height)
+- Overworld (h>=256)
+- Void (h>=1000)
+- Realm Barrier (h=11), to allow escaping the End
+- End (h>=256)
+- Void (h>=1000)
+- Nether (h=128)
+- Void (h>=1000)
+]]
+
+-- Overworld
+overworld.min = -62
+if superflat then
+	mcl_mapgen.ground = tonumber(minetest.get_mapgen_setting("mgflat_ground_level")) or 8
+	overworld.min = ground - 3
+end
+-- if singlenode then mcl_mapgen.overworld.min = -66 end -- DONT KNOW WHY
+overworld.max = mcl_mapgen.EDGE_MAX
+
+overworld.bedrock_min = overworld.min
+overworld.bedrock_max = overworld.bedrock_min + (mcl_mapgen.bedrock_is_rough and 4 or 0)
+
+mcl_mapgen.lava = normal
+overworld.lava_max = overworld.min + (normal and 10 or 0)
+
+
+-- The Nether (around Y = -29000)
+nether.min = -29067 -- Carefully chosen to be at a mapchunk border
+nether.max = nether.min + 128
+nether.bedrock_bottom_min = nether.min
+nether.bedrock_top_max = nether.max
+if not superflat then
+	nether.bedrock_bottom_max = nether.bedrock_bottom_min + 4
+	nether.bedrock_top_min = nether.bedrock_top_max - 4
+	nether.lava_max = nether.min + 31
+else
+	-- Thin bedrock in classic superflat mapgen
+	nether.bedrock_bottom_max = nether.bedrock_bottom_min
+	nether.bedrock_top_min = nether.bedrock_top_max
+	nether.lava_max = nether.min + 2
+end
+if mcl_mapgen.name == "flat" then
+	if superflat then
+		nether.flat_floor = nether.bedrock_bottom_max + 4
+		nether.flat_ceiling = nether.bedrock_bottom_max + 52
+	else
+		nether.flat_floor = nether.lava_max + 4
+		nether.flat_ceiling = nether.lava_max + 52
+	end
+end
+
+-- The End (surface at ca. Y = -27000)
+end_.min = -27073 -- Carefully chosen to be at a mapchunk border
+end_.max = overworld.min - 2000
+end_.platform_pos = { x = 100, y = end_.min + 74, z = 0 }
+
+-- Realm barrier used to safely separate the End from the void below the Overworld
+mcl_mapgen.realm_barrier_overworld_end_max = end_.max
+mcl_mapgen.realm_barrier_overworld_end_min = end_.max - 11
+
+-- Use MineClone 2-style dungeons for normal mapgen
+mcl_mapgen.dungeons = normal
+
+mcl_mapgen.overworld = overworld
+mcl_mapgen.end_ = end_
+mcl_mapgen["end"] = mcl_mapgen.end_
+mcl_mapgen.nether = nether
+
+mcl_mapgen.order = order
+
+function mcl_mapgen.get_voxel_manip(vm_context)
+	if vm_context.vm then
+		return vm
+	end
+	vm_context.vm = minetest.get_voxel_manip(vm_context.emin, vm_context.emax)
+	vm_context.emin, vm_context.emax = vm_context.vm:read_from_map(vm_context.emin, vm_context.emax)
+	vm_context.area = VoxelArea:new({MinEdge=vm_context.emin, MaxEdge=vm_context.emax})
+	return vm_context.vm
+end
+
+function mcl_mapgen.clamp_to_chunk(x, size)
+	if not size then
+		minetest.log("warning", "[mcl_mapgen] Couldn't clamp " .. tostring(x) .. " - missing size")
+		return x
+	end
+	if size > CS_NODES then
+		minetest.log("warning", "[mcl_mapgen] Couldn't clamp " .. tostring(x) .. " - given size " .. tostring(size) .. " greater than chunk size " .. tostring(mcl_mapgen.CS_NODES))
+		return x
+	end
+	local offset_in_chunk = (x + central_chunk_min_pos) % CS_NODES
+	local x2_in_chunk = offset_in_chunk + size
+	if x2_in_chunk <= CS_NODES then
+		return x
+	end
+	local overflow = x2_in_chunk - CS_NODES
+	if overflow > size / 2 then
+		local next_x = x + (size - overflow)
+		if next_x < mcl_mapgen.EDGE_MAX then
+			return next_x
+		end
+	end
+	return x - overflow
+end
+
+function mcl_mapgen.get_chunk_beginning(x)
+	return x - ((x + central_chunk_min_pos) % CS_NODES)
+end

mods/CORE/mcl_mapgen/mod.conf

@@ -0,0 +1,4 @@
+name = mcl_mapgen
+author = kay27
+description = MineClone 2/5 MapGen Basic Stuff
+depends = mcl_init

mods/ENTITIES/mcl_mobs/api/mob_functions/environment.lua

@@ -176,15 +176,15 @@ end
 -- within_limits, wmin, wmax = nil, -30913, 30928
 mobs.within_limits = function(pos, radius)
 	local wmin, wmax
-	if mcl_vars then
+	if mcl_mapgen then
-		if mcl_vars.mapgen_edge_min and mcl_vars.mapgen_edge_max then
+		if mcl_mapgen.EDGE_MIN and mcl_mapgen.EDGE_MAX then
-			wmin, wmax = mcl_vars.mapgen_edge_min, mcl_vars.mapgen_edge_max
+			wmin, wmax = mcl_mapgen.EDGE_MIN, mcl_mapgen.EDGE_MAX
-		end
-	end
 			return pos
 				and (pos.x - radius) > wmin and (pos.x + radius) < wmax
 				and (pos.y - radius) > wmin and (pos.y + radius) < wmax
 				and (pos.z - radius) > wmin and (pos.z + radius) < wmax
+		end
+	end
 end
 
 -- get node but use fallback for nil or unknown
@@ -214,6 +214,7 @@ end
 --a function used for despawning mobs
 mobs.check_for_player_within_area = function(self, radius)
 	local pos1 = self.object:get_pos()
+	if not pos1 then return end
 	--get players in radius
 	for _,player in pairs(minetest_get_connected_players()) do
 		if player and player:get_hp() > 0 then

mods/ENTITIES/mcl_mobs/mod.conf

@@ -1,5 +1,5 @@
 name = mcl_mobs
 author = PilzAdam
 description = Adds a mob API for mods to add animals or monsters, etc.
-depends = mcl_particles
+depends = mcl_mapgen, mcl_particles
 optional_depends = mcl_weather, mcl_explosions, mcl_hunger, mcl_worlds, cmi, doc_identifier, mcl_armor, mcl_portals, mcl_experience

mods/ENTITIES/mobs_mc_gameconfig/init.lua

@@ -233,15 +233,15 @@ mobs_mc.override.spawn_height = {
 	water = tonumber(minetest.settings:get("water_level")) or 0, -- Water level in the Overworld
 
 	-- Overworld boundaries (inclusive)
-	overworld_min = mcl_vars.mg_overworld_min,
+	overworld_min = mcl_mapgen.overworld.min,
-	overworld_max = mcl_vars.mg_overworld_max,
+	overworld_max = mcl_mapgen.overworld.max,
 
 	-- Nether boundaries (inclusive)
-	nether_min = mcl_vars.mg_nether_min,
+	nether_min = mcl_mapgen.nether.min,
-	nether_max = mcl_vars.mg_nether_max,
+	nether_max = mcl_mapgen.nether.max,
 
 	-- End boundaries (inclusive)
-	end_min = mcl_vars.mg_end_min,
+	end_min = mcl_mapgen.end_.min,
-	end_max = mcl_vars.mg_end_max,
+	end_max = mcl_mapgen.end_.max,
 }
 

mods/ITEMS/mcl_core/functions.lua

@@ -4,7 +4,8 @@
 
 local modpath = minetest.get_modpath(minetest.get_current_modname())
 
-local mg_name = minetest.get_mapgen_setting("mg_name")
+local mg_name = mcl_mapgen.name
+local v6 = mcl_mapgen.v6
 
 local math = math
 local vector = vector
@@ -204,8 +205,23 @@ minetest.register_abm({
 	action = function(pos, node, active_object_count, active_object_count_wider)
 		for _, object in pairs(minetest.get_objects_inside_radius(pos, 0.9)) do
 			local entity = object:get_luaentity()
-			if entity and entity.name == "__builtin:item" then
+			if entity then
+				local entity_name = entity.name
+				if entity_name == "__builtin:item" then
 					object:remove()
+				elseif entity_name == "mcl_minecarts:minecart" then
+					local pos = object:get_pos()
+					local driver = entity._driver
+					if driver then
+						mcl_player.player_attached[driver] = nil
+						local player = minetest.get_player_by_name(driver)
+						player:set_detach()
+						player:set_eye_offset({x=0, y=0, z=0},{x=0, y=0, z=0})
+						mcl_player.player_set_animation(player, "stand" , 30)
+					end
+					minetest.add_item(pos, "mcl_minecarts:minecart")
+					object:remove()
+				end
 			end
 		end
 		local posses = { { 1, 0 }, { -1, 0 }, { 0, 1 }, { 0, -1 } }
@@ -366,7 +382,7 @@ function mcl_core.generate_tree(pos, tree_type, options)
 	local balloon = options and options.balloon
 
 	if tree_type == nil or tree_type == OAK_TREE_ID then
-		if mg_name == "v6" then
+		if v6 then
 			mcl_core.generate_v6_oak_tree(pos)
 		else
 			if balloon then
@@ -381,7 +397,7 @@ function mcl_core.generate_tree(pos, tree_type, options)
 		if two_by_two then
 			mcl_core.generate_huge_spruce_tree(pos)
 		else
-			if mg_name == "v6" then
+			if v6 then
 				mcl_core.generate_v6_spruce_tree(pos)
 			else
 				mcl_core.generate_spruce_tree(pos)
@@ -393,7 +409,7 @@ function mcl_core.generate_tree(pos, tree_type, options)
 		if two_by_two then
 			mcl_core.generate_huge_jungle_tree(pos)
 		else
-			if mg_name == "v6" then
+			if v6 then
 				mcl_core.generate_v6_jungle_tree(pos)
 			else
 				mcl_core.generate_jungle_tree(pos)
@@ -771,7 +787,7 @@ function mcl_core.generate_huge_jungle_tree(pos)
 end
 
 
-local grass_spread_randomizer = PseudoRandom(minetest.get_mapgen_setting("seed"))
+local grass_spread_randomizer = PseudoRandom(mcl_mapgen.seed)
 
 function mcl_core.get_grass_palette_index(pos)
 	local biome_data = minetest.get_biome_data(pos)

mods/ITEMS/mcl_core/mod.conf

@@ -1,4 +1,4 @@
 name = mcl_core
 description = Core items of MineClone 2: Basic biome blocks (dirt, sand, stones, etc.), derived items, glass, sugar cane, cactus, barrier, mining tools, hand, craftitems, and misc. items which don't really fit anywhere else.
-depends = mcl_autogroup, mcl_init, mcl_sounds, mcl_particles, mcl_util, mcl_worlds, doc_items, mcl_enchanting, mcl_colors
+depends = mcl_autogroup, mcl_init, mcl_sounds, mcl_particles, mcl_util, mcl_worlds, doc_items, mcl_enchanting, mcl_colors, mcl_mapgen
 optional_depends = doc

mods/ITEMS/mcl_portals/mod.conf

@@ -1,4 +1,4 @@
 name = mcl_portals
 description = Adds buildable portals to the Nether and End dimensions.
-depends = mcl_nether, mcl_end, mcl_particles, mcl_spawn, mcl_credits
+depends = mcl_mapgen, mcl_nether, mcl_end, mcl_particles, mcl_spawn, mcl_credits, mcl_structures
 optional_depends = awards, doc

mods/ITEMS/mcl_portals/portal_end.lua

@@ -6,12 +6,6 @@ local math = math
 
 local has_doc = minetest.get_modpath("doc")
 
--- Parameters
---local SPAWN_MIN = mcl_vars.mg_end_min+70
---local SPAWN_MAX = mcl_vars.mg_end_min+98
-
---local mg_name = minetest.get_mapgen_setting("mg_name")
-
 local function destroy_portal(pos)
 	local neighbors = {
 		{ x=1, y=0, z=0 },
@@ -184,7 +178,7 @@ function mcl_portals.end_teleport(obj, pos)
 		-- Teleport to the End at a fixed position and generate a
 		-- 5×5 obsidian platform below.
 
-		local platform_pos = mcl_vars.mg_end_platform_pos
+		local platform_pos = mcl_mapgen.end_.platform_pos
 		-- force emerge of target1 area
 		minetest.get_voxel_manip():read_from_map(platform_pos, platform_pos)
 		if not minetest.get_node_or_nil(platform_pos) then

mods/ITEMS/mcl_portals/portal_nether.lua

@@ -19,7 +19,7 @@ local W_MIN, W_MAX			= 4, 23
 local H_MIN, H_MAX			= 5, 23
 local N_MIN, N_MAX			= 6, (W_MAX-2) * (H_MAX-2)
 local TRAVEL_X, TRAVEL_Y, TRAVEL_Z	= 8, 1, 8
-local LIM_MIN, LIM_MAX			= mcl_vars.mapgen_edge_min, mcl_vars.mapgen_edge_max
+local LIM_MIN, LIM_MAX			= mcl_mapgen.EDGE_MIN, mcl_mapgen.EDGE_MAX
 local PLAYER_COOLOFF, MOB_COOLOFF	= 3, 14 -- for this many seconds they won't teleported again
 local TOUCH_CHATTER_TIME		= 1 -- prevent multiple teleportation attempts caused by multiple portal touches, for this number of seconds
 local CHATTER_US			= TOUCH_CHATTER_TIME * 1000000
@@ -27,8 +27,8 @@ local DELAY				= 3 -- seconds before teleporting in Nether portal in Survival mo
 local DISTANCE_MAX			= 128
 local PORTAL				= "mcl_portals:portal"
 local OBSIDIAN				= "mcl_core:obsidian"
-local O_Y_MIN, O_Y_MAX			= max(mcl_vars.mg_overworld_min, -31), min(mcl_vars.mg_overworld_max, 2048)
+local O_Y_MIN, O_Y_MAX			= max(mcl_mapgen.overworld.min, -31), min(mcl_mapgen.overworld.max, 2048)
-local N_Y_MIN, N_Y_MAX			= mcl_vars.mg_bedrock_nether_bottom_min, mcl_vars.mg_bedrock_nether_top_min - H_MIN
+local N_Y_MIN, N_Y_MAX			= mcl_mapgen.nether.bedrock_bottom_min, mcl_mapgen.nether.bedrock_top_min - H_MIN
 
 -- Alpha and particles
 local node_particles_allowed = minetest.settings:get("mcl_node_particles") or "none"
@@ -66,7 +66,7 @@ minetest.register_on_shutdown(function()
 	storage:set_string("nether_exits_keys", minetest.serialize(keys))
 end)
 
-local get_node = mcl_vars.get_node
+local get_node = mcl_mapgen.get_far_node
 local set_node = minetest.set_node
 local registered_nodes = minetest.registered_nodes
 local is_protected = minetest.is_protected
@@ -137,19 +137,8 @@ local function find_exit(p, dx, dy, dz)
 	if not p or not p.y or not p.z or not p.x then return end
 	local dx, dy, dz = dx or DISTANCE_MAX, dy or DISTANCE_MAX, dz or DISTANCE_MAX
 	if dx < 1 or dy < 1 or dz < 1 then return false end
-
+	local x, y, z = floor(p.x), floor(p.y), floor(p.z)
-    --y values aren't used
+	local x1, y1, z1, x2, y2, z2 = x-dx+1, y-dy+1, z-dz+1, x+dx-1, y+dy-1, z+dz-1
-	local x = floor(p.x)
-    --local y = floor(p.y)
-    local z = floor(p.z)
-
-	local x1 = x-dx+1
-    --local y1 = y-dy+1
-    local z1 = z-dz+1
-
-    local x2 = x+dx-1
-    --local y2 = y+dy-1
-    local z2 = z+dz-1
 
 	local k1x, k2x = floor(x1/256), floor(x2/256)
 	local k1z, k2z = floor(z1/256), floor(z2/256)
@@ -170,11 +159,27 @@ local function find_exit(p, dx, dy, dz)
 		end
 	end end
 
-	if t and abs(t.x-p.x) <= dx and abs(t.y-p.y) <= dy and abs(t.z-p.z) <= dz then
+	if t and abs(t.x-x) <= dx and abs(t.y-y) <= dy and abs(t.z-z) <= dz then
 		return t
 	end
 end
 
+-- This functon searches Nether portal nodes whitin distance specified and checks the node
+local function find_exit_with_check(p, dx, dy, dz)
+	while true do
+		local pos = find_exit(p, dx, dy, dz)
+		if not pos then
+			-- not found:
+			return
+		end
+		if (get_node(pos).name == PORTAL) then
+			return pos
+		end
+		-- I don't know the reason why it can happen, but if we're here, let's log it, remove this record and try again:
+		log("warning", "[mcl_portals] Found faulty exit from Nether portal at " .. pos_to_string(pos) .. " - removed")
+		remove_exit(pos)
+	end
+end
 
 -- Ping-Pong the coordinate for Fast Travelling, https://git.minetest.land/Wuzzy/MineClone2/issues/795#issuecomment-11058
 local function ping_pong(x, m, l1, l2)
@@ -350,7 +355,7 @@ function build_nether_portal(pos, width, height, orientation, name, clear_before
 	return pos
 end
 
-function mcl_portals.spawn_nether_portal(pos, rot, pr, name)
+function mcl_portals.spawn_nether_portal(pos, rot, pr, placer)
 	if not pos then return end
 	local o = 0
 	if rot then
@@ -360,6 +365,10 @@ function mcl_portals.spawn_nether_portal(pos, rot, pr, name)
 			o = random(0,1)
 		end
 	end
+	local name
+	if placer and placer:is_player() then
+		name = placer:get_player_name()
+	end
 	build_nether_portal(pos, nil, nil, o, name, true)
 end
 
@@ -432,7 +441,7 @@ local function create_portal_2(pos1, name, obj)
 	end
 	local exit = build_nether_portal(pos1, W_MIN-2, H_MIN-2, orientation, name)
 	finalize_teleport(obj, exit)
-	local cn = mcl_vars.get_chunk_number(pos1)
+	local cn = mcl_mapgen.get_chunk_number(pos1)
 	chunks[cn] = nil
 	if queue[cn] then
 		for next_obj, _ in pairs(queue[cn]) do
@@ -446,9 +455,9 @@ end
 
 local function get_lava_level(pos, pos1, pos2)
 	if pos.y > -1000 then
-		return max(min(mcl_vars.mg_lava_overworld_max, pos2.y-1), pos1.y+1)
+		return max(min(mcl_mapgen.overworld.lava_max, pos2.y-1), pos1.y+1)
 	end
-	return max(min(mcl_vars.mg_lava_nether_max, pos2.y-1), pos1.y+1)
+	return max(min(mcl_mapgen.nether.lava_max, pos2.y-1), pos1.y+1)
 end
 
 local function ecb_scan_area_2(blockpos, action, calls_remaining, param)
@@ -464,7 +473,7 @@ local function ecb_scan_area_2(blockpos, action, calls_remaining, param)
 		for _, p in pairs(portals) do
 			add_exit(p)
 		end
-		local exit = find_exit(pos)
+		local exit = find_exit_with_check(pos)
 		if exit then
 			finalize_teleport(obj, exit)
 		end
@@ -527,7 +536,7 @@ local function ecb_scan_area_2(blockpos, action, calls_remaining, param)
 end
 
 local function create_portal(pos, limit1, limit2, name, obj)
-	local cn = mcl_vars.get_chunk_number(pos)
+	local cn = mcl_mapgen.get_chunk_number(pos)
 	if chunks[cn] then
 		local q = queue[cn] or {}
 		q[obj] = true
@@ -540,8 +549,8 @@ local function create_portal(pos, limit1, limit2, name, obj)
 	-- so we'll emerge single chunk only: 5x5x5 blocks, 80x80x80 nodes maximum
 	-- and maybe one more chunk from below if (SCAN_2_MAP_CHUNKS = true)
 
-	local pos1 = add(mul(mcl_vars.pos_to_chunk(pos), mcl_vars.chunk_size_in_nodes), mcl_vars.central_chunk_offset_in_nodes)
+	local pos1 = add(mul(mcl_mapgen.pos_to_chunk(pos), mcl_mapgen.CS_NODES), mcl_mapgen.OFFSET_NODES)
-	local pos2 = add(pos1, mcl_vars.chunk_size_in_nodes - 1)
+	local pos2 = add(pos1, mcl_mapgen.CS_NODES - 1)
 
 	if not SCAN_2_MAP_CHUNKS then
 		if limit1 and limit1.x and limit1.y and limit1.z then
@@ -555,8 +564,8 @@ local function create_portal(pos, limit1, limit2, name, obj)
 	end
 
 	-- Basically the copy of code above, with minor additions to continue the search in single additional chunk below:
-	local next_chunk_1 = {x = pos1.x, y = pos1.y - mcl_vars.chunk_size_in_nodes, z = pos1.z}
+	local next_chunk_1 = {x = pos1.x, y = pos1.y - mcl_mapgen.CS_NODES, z = pos1.z}
-	local next_chunk_2 = add(next_chunk_1, mcl_vars.chunk_size_in_nodes - 1)
+	local next_chunk_2 = add(next_chunk_1, mcl_mapgen.CS_NODES - 1)
 	local next_pos = {x = pos.x, y=max(next_chunk_2.y, limit1.y), z = pos.z}
 	if limit1 and limit1.x and limit1.y and limit1.z then
 		pos1 = {x = max(min(limit1.x, pos.x), pos1.x), y = max(min(limit1.y, pos.y), pos1.y), z = max(min(limit1.z, pos.z), pos1.z)}
@@ -682,11 +691,12 @@ local function teleport_no_delay(obj, pos)
 		name = obj:get_player_name()
 	end
 
-	local exit = find_exit(target)
+	local exit = find_exit_with_check(target)
 	if exit then
 		finalize_teleport(obj, exit)
 	else
 		dim = dimension_to_teleport[dim]
+		if not dim then return end
 		-- need to create arrival portal
 		create_portal(target, limits[dim].pmin, limits[dim].pmax, name, obj)
 	end
@@ -748,6 +758,8 @@ local function teleport(obj, portal_pos)
 	minetest.after(DELAY, teleport_no_delay, obj, portal_pos)
 end
 
+mcl_structures.register_structure({name = "nether_portal", place_function = mcl_portals.spawn_nether_portal})
+
 minetest.register_abm({
 	label = "Nether portal teleportation and particles",
 	nodenames = {PORTAL},

mods/MAPGEN/mcl_biomes/mod.conf

@@ -1,4 +1,4 @@
 name = mcl_biomes
 author = maikerumine
 description = Adds the various biomes and biome-related things for non-v6 map generators.
-depends = mcl_init, mcl_mapgen_core, mcl_core, mcl_worlds, mcl_farming, mcl_flowers, mcl_end, mcl_ocean
+depends = mcl_mapgen, mcl_mapgen_core, mcl_core, mcl_worlds, mcl_farming, mcl_flowers, mcl_end, mcl_ocean

mods/MAPGEN/mcl_dungeons/init.lua

@@ -2,21 +2,19 @@
 
 mcl_dungeons = {}
 
-local mg_name = minetest.get_mapgen_setting("mg_name")
-
 -- Are dungeons disabled?
-if mcl_vars.mg_dungeons == false or mg_name == "singlenode" then
+if mcl_mapgen.dungeons == false or mcl_mapgen.singlenode == true then
 	return
 end
 
 --lua locals
 --minetest
+local minetest_find_nodes_in_area = minetest.find_nodes_in_area
 local registered_nodes = minetest.registered_nodes
 local swap_node        = minetest.swap_node
 local set_node         = minetest.set_node
 local dir_to_facedir   = minetest.dir_to_facedir
 local get_meta         = minetest.get_meta
-local emerge_area      = minetest.emerge_area
 
 --vector
 local vector_add       = vector.add
@@ -32,15 +30,15 @@ local math_max         = math.max
 local math_ceil        = math.ceil
 
 --custom mcl_vars
-local get_node = mcl_vars.get_node
+local get_node = mcl_mapgen.get_far_node
 
 
-local min_y = math_max(mcl_vars.mg_overworld_min, mcl_vars.mg_bedrock_overworld_max) + 1
+local min_y = math_max(mcl_mapgen.overworld.min, mcl_mapgen.overworld.bedrock_max) + 1
-local max_y = mcl_vars.mg_overworld_max - 1
+local max_y = mcl_mapgen.overworld.max - 1
 -- Calculate the number of dungeon spawn attempts
 -- In Minecraft, there 8 dungeon spawn attempts Minecraft chunk (16*256*16 = 65536 blocks).
 -- Minetest chunks don't have this size, so scale the number accordingly.
-local attempts = math_ceil(((mcl_vars.chunksize * mcl_vars.MAP_BLOCKSIZE) ^ 3) / 8192) -- 63 = 80*80*80/8192
+local attempts = math_ceil((mcl_mapgen.CS_NODES ^ 3) / 8192) -- 63 = 80*80*80/8192
 
 local dungeonsizes = {
 	{ x=5, y=4, z=5},
@@ -112,7 +110,7 @@ local loottable =
 }
 
 -- Bonus loot for v6 mapgen: Otherwise unobtainable saplings.
-if mg_name == "v6" then
+if mcl_mapgen.v6 then
 	table.insert(loottable, {
 		stacks_min = 1,
 		stacks_max = 3,
@@ -124,20 +122,28 @@ if mg_name == "v6" then
 	})
 end
 
-local function ecb_spawn_dungeon(blockpos, action, calls_remaining, param)
+--local function ecb_spawn_dungeon(blockpos, action, calls_remaining, param)
-	if calls_remaining >= 1 then return end
+--	if calls_remaining >= 1 then return end
+--	local p1, _, dim, pr = param.p1, param.p2, param.dim, param.pr
+--	local check = not (param.dontcheck or false)
+local m1, m2 = 0, 0
+local function spawn_dungeon(p1, p2, dim, pr, dontcheck)
 
-	local p1, _, dim, pr = param.p1, param.p2, param.dim, param.pr
 	local x, y, z = p1.x, p1.y, p1.z
-	local check = not (param.dontcheck or false)
+	local check = not (dontcheck or false)
 
 	-- Check floor and ceiling: Must be *completely* solid
 	local y_floor = y
 	local y_ceiling = y + dim.y + 1
-	if check then for tx = x+1, x+dim.x do for tz = z+1, z+dim.z do
+
-		if not registered_nodes[get_node({x = tx, y = y_floor  , z = tz}).name].walkable
+	if check then
-		or not registered_nodes[get_node({x = tx, y = y_ceiling, z = tz}).name].walkable then return false end
+		local dim_x, dim_z = dim.x, dim.z
-	end end end
+		local size = dim_z*dim_x
+		if #minetest_find_nodes_in_area({x=x+1,y=y_floor,z=z+1}, {x=x+dim_z,y=y_floor,z=z+dim_z}, "group:walkabke") < size
+		or #minetest_find_nodes_in_area({x=x+1,y=y_floor,z=z+1}, {x=x+dim_z,y=y_floor,z=z+dim_z}, "group:walkabke") < size then
+			return
+		end
+	end
 
 	-- Check for air openings (2 stacked air at ground level) in wall positions
 	local openings_counter = 0
@@ -404,8 +410,7 @@ local function dungeons_nodes(minp, maxp, blockseed)
 		local z = pr:next(minp.z, maxp.z-dim.z-1)
 		local p1 = {x=x,y=y,z=z}
 		local p2 = {x = x+dim.x+1, y = y+dim.y+1, z = z+dim.z+1}
-		minetest.log("verbose","[mcl_dungeons] size=" ..minetest.pos_to_string(dim) .. ", emerge from "..minetest.pos_to_string(p1) .. " to " .. minetest.pos_to_string(p2))
+		spawn_dungeon(p1, p2, dim, pr)
-		emerge_area(p1, p2, ecb_spawn_dungeon, {p1=p1, p2=p2, dim=dim, pr=pr})
 	end
 end
 
@@ -413,8 +418,7 @@ function mcl_dungeons.spawn_dungeon(p1, _, pr)
 	if not p1 or not pr or not p1.x or not p1.y or not p1.z then return end
 	local dim = dungeonsizes[pr:next(1, #dungeonsizes)]
 	local p2 = {x = p1.x+dim.x+1, y = p1.y+dim.y+1, z = p1.z+dim.z+1}
-	minetest.log("verbose","[mcl_dungeons] size=" ..minetest.pos_to_string(dim) .. ", emerge from "..minetest.pos_to_string(p1) .. " to " .. minetest.pos_to_string(p2))
+	spawn_dungeon(p1, p2, dim, pr, true)
-	emerge_area(p1, p2, ecb_spawn_dungeon, {p1=p1, p2=p2, dim=dim, pr=pr, dontcheck=true})
 end
 
-mcl_mapgen_core.register_generator("dungeons", nil, dungeons_nodes, 999999)
+mcl_mapgen.register_mapgen(dungeons_nodes, mcl_mapgen.order.DUNGEONS)

mods/MAPGEN/mcl_dungeons/mod.conf

@@ -1,4 +1,4 @@
 name = mcl_dungeons
 author = Wuzzy
 description = Generates random dungeons in the world
-depends = mcl_init, mcl_core, mcl_chests, mcl_mobs, mcl_mobspawners, mcl_mapgen_core, mobs_mc
+depends = mcl_mapgen, mcl_core, mcl_chests, mcl_mobs, mcl_mobspawners, mcl_mapgen_core, mobs_mc

mods/MAPGEN/mcl_end_island/init.lua

@@ -10,25 +10,21 @@ local noisemap = PerlinNoiseMap({
 local c_end_stone = minetest.get_content_id("mcl_end:end_stone")
 local y_offset = -2
 
-minetest.register_on_generated(function(minp, maxp)
+mcl_mapgen.register_on_generated(function(vm_context)
+	local minp, maxp = vm_context.minp, vm_context.maxp
 	if maxp.y < (-27025 + y_offset) or minp.y > (-27000 + y_offset + 4) or maxp.x < -75 or minp.x > 75  or maxp.z < -75 or minp.z > 75 then
 		return
 	end
-
+	local data = vm_context.data
-	local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
+	local area = vm_context.area
-	local data = vm:get_data()
+	local write = false
-	local area = VoxelArea:new({MinEdge = emin, MaxEdge = emax})
-
 	for idx in area:iter(math.max(minp.x, -75), math.max(minp.y, -27025 + y_offset + 4), math.max(minp.z, -75), math.min(maxp.x, 75), math.min(maxp.y, -27000 + y_offset), math.min(maxp.z, 75)) do
 		local pos = area:position(idx)
 		local y = 27025 + pos.y - y_offset
 		if noisemap[pos.x + 75 + 1][y + 1][pos.z + 75 + 1] > (math.abs(1 - y / 25) ^ 2 + math.abs(pos.x / 75) ^ 2 + math.abs(pos.z / 75) ^ 2) then
 			data[idx] = c_end_stone
+			write = true
 		end
 	end
-
+	vm_context.write = vm_context.write or write
-	vm:set_data(data)
-	vm:calc_lighting()
-	vm:update_liquids()
-	vm:write_to_map()
 end)

mods/MAPGEN/mcl_mapgen_core/clay.lua

@@ -0,0 +1,63 @@
+local c_water = minetest.get_content_id("mcl_core:water_source")
+local c_dirt = minetest.get_content_id("mcl_core:dirt")
+local c_clay = minetest.get_content_id("mcl_core:clay")
+
+local perlin_clay
+
+local math_max = math.max
+local math_min = math.min
+local math_floor = math.floor
+local math_abs = math.abs
+local offset = math_floor(mcl_mapgen.BS / 2)
+local minetest_get_item_group = minetest.get_item_group
+local minetest_get_name_from_content_id = minetest.get_name_from_content_id
+
+mcl_mapgen.register_mapgen_block_lvm(function(c)
+	local minp, maxp, blockseed, voxelmanip_data, voxelmanip_area = c.minp, c.maxp, c.blockseed, c.data, c.area
+	local max_y = maxp.y
+	if max_y < -7 then return end
+	local min_y = minp.y
+	if min_y > 0 then return end
+
+	c.vm = c.vm or mcl_mapgen.get_voxel_manip(c)
+
+	local pr = PseudoRandom(blockseed)
+
+	perlin_clay = perlin_clay or minetest.get_perlin({
+		offset = 0.5,
+		scale = 0.2,
+		spread = {x = 5, y = 5, z = 5},
+		seed = -316,
+		octaves = 1,
+		persist = 0.0
+	})
+
+	for y = math_max(min_y, -8), math_min(max_y, 0) do
+		-- Assume X and Z lengths are equal
+		local x = minp.x + offset + pr:next(-2, 2)
+		local z = minp.z + offset + pr:next(-2, 2)
+		if perlin_clay:get_3d({x = x, y = y, z = z}) + pr:next(1, 20) > 19 then
+			-- Get position and shift it a bit randomly so the clay do not obviously appear in a grid
+			local water_pos = voxelmanip_area:index(x, y + 1, z)
+			local water_node = voxelmanip_data[water_pos]
+			if water_node == c_water or water_node == c_clay then
+				local surface_pos = voxelmanip_area:index(x, y, z)
+				local surface_node = voxelmanip_data[surface_pos]
+				if (surface_node == c_dirt or surface_node == c_clay or minetest_get_item_group(minetest_get_name_from_content_id(surface_node), "sand") == 1) then
+					local diamondsize = pr:next(1, 3)
+					for x1 = -diamondsize, diamondsize do
+						local abs_x1 = math_abs(x1)
+						for z1 = -(diamondsize - abs_x1), diamondsize - abs_x1 do
+							local ccpos = voxelmanip_area:index(x + x1, y, z + z1)
+							local claycandidate = voxelmanip_data[ccpos]
+							if voxelmanip_data[ccpos] == c_dirt or minetest_get_item_group(minetest_get_name_from_content_id(claycandidate), "sand") == 1 then
+								voxelmanip_data[ccpos] = c_clay
+								c.write = true
+							end
+						end
+					end
+				end
+			end
+		end
+	end
+end)

mods/MAPGEN/mcl_mapgen_core/mod.conf

@@ -1,5 +1,5 @@
 name = mcl_mapgen_core
 author = Wuzzy
 description = The core of the MCL2 mapgen
-depends = mcl_init, mcl_core, biomeinfo, mcl_worlds, mcl_cocoas, mcl_sponges, mcl_ocean, mcl_stairs, mcl_monster_eggs, mcl_structures
+depends = mcl_mapgen, mcl_init, mcl_core, biomeinfo, mcl_worlds
-optional_depends = mclx_core
+optional_depends = mclx_core, mcl_cocoas, mcl_sponges, mcl_ocean, mcl_stairs, mcl_monster_eggs, mcl_structures, mcl_flowers, mcl_farming, mcl_mushrooms, mcl_nether

mods/MAPGEN/mcl_mapgen_core/tree_decoration.lua

@@ -0,0 +1,251 @@
+-- Generate tree decorations in the bounding box. This adds:
+-- * Cocoa at jungle trees
+-- * Jungle tree vines
+-- * Oak vines in swamplands
+
+local minetest_find_nodes_in_area = minetest.find_nodes_in_area
+local minetest_find_node_near = minetest.find_node_near
+local minetest_get_node_light = minetest.get_node_light
+local minetest_dir_to_facedir = minetest.dir_to_facedir
+local minetest_dir_to_wallmounted = minetest.dir_to_wallmounted
+local table_copy = table.copy
+local vector_subtract = vector.subtract
+local vector_add = vector.add
+local math_max = math.max
+local math_ceil = math.ceil
+local math_abs = math.abs
+
+local c_air = minetest.CONTENT_AIR
+local c_cocoas
+local c_jungleleaves = minetest.get_content_id("mcl_core:jungleleaves")
+local c_leaves       = minetest.get_content_id("mcl_core:leaves")
+local c_vine         = minetest.get_content_id("mcl_core:vine")
+
+if minetest.get_modpath("mcl_cocoas") then
+	c_cocoas = {
+		minetest.get_content_id("mcl_cocoas:cocoa_1"),
+		minetest.get_content_id("mcl_cocoas:cocoa_2"),
+		minetest.get_content_id("mcl_cocoas:cocoa_3"),
+	}
+end
+
+local swampland
+local swampland_shore
+local jungle
+local jungle_shore
+local jungle_m
+local jungle_m_shore
+local jungle_edge
+local jungle_edge_shore
+local jungle_edge_m
+local jungle_edge_m_shore
+
+local perlin_vines, perlin_vines_fine, perlin_vines_upwards, perlin_vines_length, perlin_vines_density
+
+local dirs = {
+	{x =  1, y = 0, z =  0},
+	{x = -1, y = 0, z =  0},
+	{x =  0, y = 0, z =  1},
+	{x =  0, y = 0, z = -1},
+}
+
+local function generate_tree_decorations(vm_context)
+	local maxp = vm_context.maxp
+	if maxp.y < 0 then return end
+	local minp = vm_context.minp
+
+	local data = vm_context.data
+	vm_context.param2_data = vm_context.param2_data or vm_context.vm:get_param2_data(vm_context.lvm_param2_buffer)
+	local param2_data = vm_context.param2_data
+	local area = vm_context.area
+
+	local biomemap = vm_context.biomemap
+
+	local pr = PseudoRandom(vm_context.chunkseed)
+
+	local oaktree, oakleaves, jungletree, jungleleaves = {}, {}, {}, {}
+
+	-- Modifier for Jungle M biome: More vines and cocoas
+	local dense_vegetation = false
+
+	if biomemap then
+		swampland           = swampland or minetest.get_biome_id("Swampland")
+		swampland_shore     = swampland_shore or minetest.get_biome_id("Swampland_shore")
+		jungle              = jungle or minetest.get_biome_id("Jungle")
+		jungle_shore        = jungle_shore or minetest.get_biome_id("Jungle_shore")
+		jungle_m            = jungle_m or minetest.get_biome_id("JungleM")
+		jungle_m_shore      = jungle_m_shore or minetest.get_biome_id("JungleM_shore")
+		jungle_edge         = jungle_edge or minetest.get_biome_id("JungleEdge")
+		jungle_edge_shore   = jungle_edge_shore or minetest.get_biome_id("JungleEdge_shore")
+		jungle_edge_m       = jungle_edge_m or minetest.get_biome_id("JungleEdgeM")
+		jungle_edge_m_shore = jungle_edge_m_shore or minetest.get_biome_id("JungleEdgeM_shore")
+
+		-- Biome map available: Check if the required biome (jungle or swampland)
+		-- is in this mapchunk. We are only interested in trees in the correct biome.
+		-- The nodes are added if the correct biome is *anywhere* in the mapchunk.
+		-- TODO: Strictly generate vines in the correct biomes only.
+		local swamp_biome_found, jungle_biome_found = false, false
+		for b=1, #biomemap do
+			local id = biomemap[b]
+
+			if not swamp_biome_found and (id == swampland or id == swampland_shore) then
+				oaktree = minetest_find_nodes_in_area(minp, maxp, {"mcl_core:tree"})
+				oakleaves = minetest_find_nodes_in_area(minp, maxp, {"mcl_core:leaves"})
+				swamp_biome_found = true
+			end
+			if not jungle_biome_found and (id == jungle or id == jungle_shore or id == jungle_m or id == jungle_m_shore or id == jungle_edge or id == jungle_edge_shore or id == jungle_edge_m or id == jungle_edge_m_shore) then
+				jungletree = minetest_find_nodes_in_area(minp, maxp, {"mcl_core:jungletree"})
+				jungleleaves = minetest_find_nodes_in_area(minp, maxp, {"mcl_core:jungleleaves"})
+				jungle_biome_found = true
+			end
+			if not dense_vegetation and (id == jungle_m or id == jungle_m_shore) then
+				dense_vegetation = true
+			end
+			if swamp_biome_found and jungle_biome_found and dense_vegetation then
+				break
+			end
+		end
+	else
+		-- If there is no biome map, we just count all jungle things we can find.
+		-- Oak vines will not be generated.
+		jungletree = minetest_find_nodes_in_area(minp, maxp, {"mcl_core:jungletree"})
+		jungleleaves = minetest_find_nodes_in_area(minp, maxp, {"mcl_core:jungleleaves"})
+	end
+
+	local pos, treepos, dir
+
+	if c_cocoas then
+		local cocoachance = 40
+		if dense_vegetation then
+			cocoachance = 32
+		end
+
+		-- Pass 1: Generate cocoas at jungle trees
+		for n = 1, #jungletree do
+
+			pos = table_copy(jungletree[n])
+			treepos = table_copy(pos)
+
+			if minetest_find_node_near(pos, 1, {"mcl_core:jungleleaves"}) then
+
+				dir = pr:next(1, cocoachance)
+
+				if dir == 1 then
+					pos.z = pos.z + 1
+				elseif dir == 2 then
+					pos.z = pos.z - 1
+				elseif dir == 3 then
+					pos.x = pos.x + 1
+				elseif dir == 4 then
+					pos.x = pos.x -1
+				end
+
+				local p_pos = area:index(pos.x, pos.y, pos.z)
+				local l = minetest_get_node_light(pos)
+
+				if dir < 5
+				and data[p_pos] == c_air
+				and l and l > 12 then
+					local c = pr:next(1, 3)
+					data[p_pos] = c_cocoas[c]
+					vm_context.write = true
+					param2_data[p_pos] = minetest_dir_to_facedir(vector_subtract(treepos, pos))
+					vm_context.write_param2 = true
+				end
+			end
+		end
+	end
+
+	-- Pass 2: Generate vines at jungle wood, jungle leaves in jungle and oak wood, oak leaves in swampland
+	perlin_vines = perlin_vines or minetest.get_perlin(555, 4, 0.6, 500)
+	perlin_vines_fine = perlin_vines_fine or minetest.get_perlin(43000, 3, 0.6, 1)
+	perlin_vines_length = perlin_vines_length or minetest.get_perlin(435, 4, 0.6, 75)
+	perlin_vines_upwards = perlin_vines_upwards or minetest.get_perlin(436, 3, 0.6, 10)
+	perlin_vines_density = perlin_vines_density or minetest.get_perlin(436, 3, 0.6, 500)
+
+	-- Extra long vines in Jungle M
+	local maxvinelength = 7
+	if dense_vegetation then
+		maxvinelength = 14
+	end
+	local treething
+	for i=1, 4 do
+		if i==1 then
+			treething = jungletree
+		elseif i == 2 then
+			treething = jungleleaves
+		elseif i == 3 then
+			treething = oaktree
+		elseif i == 4 then
+			treething = oakleaves
+		end
+
+		for n = 1, #treething do
+			pos = treething[n]
+
+			treepos = table_copy(pos)
+
+			for d = 1, #dirs do
+				local pos = vector_add(pos, dirs[d])
+				local p_pos = area:index(pos.x, pos.y, pos.z)
+
+				local vine_threshold = math_max(0.33333, perlin_vines_density:get_2d(pos))
+				if dense_vegetation then
+					vine_threshold = vine_threshold * (2/3)
+				end
+
+				if perlin_vines:get_2d(pos) > -1.0 and perlin_vines_fine:get_3d(pos) > vine_threshold and data[p_pos] == c_air then
+
+					local rdir = {}
+					rdir.x = -dirs[d].x
+					rdir.y = dirs[d].y
+					rdir.z = -dirs[d].z
+					local param2 = minetest_dir_to_wallmounted(rdir)
+
+					-- Determine growth direction
+					local grow_upwards = false
+					-- Only possible on the wood, not on the leaves
+					if i == 1 then
+						grow_upwards = perlin_vines_upwards:get_3d(pos) > 0.8
+					end
+					if grow_upwards then
+						-- Grow vines up 1-4 nodes, even through jungleleaves.
+						-- This may give climbing access all the way to the top of the tree :-)
+						-- But this will be fairly rare.
+						local length = math_ceil(math_abs(perlin_vines_length:get_3d(pos)) * 4)
+						for l=0, length-1 do
+							local t_pos = area:index(treepos.x, treepos.y, treepos.z)
+
+							if (data[p_pos] == c_air or data[p_pos] == c_jungleleaves or data[p_pos] == c_leaves) and mcl_core.supports_vines(minetest.get_name_from_content_id(data[t_pos])) then
+								data[p_pos] = c_vine
+								param2_data[p_pos] = param2
+								vm_context.write = true
+							else
+								break
+							end
+							pos.y = pos.y + 1
+							p_pos = area:index(pos.x, pos.y, pos.z)
+							treepos.y = treepos.y + 1
+						end
+					else
+						-- Grow vines down, length between 1 and maxvinelength
+						local length = math_ceil(math_abs(perlin_vines_length:get_3d(pos)) * maxvinelength)
+						for l=0, length-1 do
+							if data[p_pos] == c_air then
+								data[p_pos] = c_vine
+								param2_data[p_pos] = param2
+								vm_context.write = true
+							else
+								break
+							end
+							pos.y = pos.y - 1
+							p_pos = area:index(pos.x, pos.y, pos.z)
+						end
+					end
+				end
+			end
+		end
+	end
+end
+
+mcl_mapgen.register_on_generated(generate_tree_decorations, 0)

mods/MAPGEN/mcl_ocean_monument/init.lua

@@ -0,0 +1,97 @@
+
+-- Check it:
+--	seed 1, v7 mapgen
+--	/teleport 14958,8,11370
+
+local mcl_mapgen_get_far_node = mcl_mapgen.get_far_node
+local minetest_log = minetest.log
+local minetest_place_schematic = minetest.place_schematic
+local minetest_pos_to_string = minetest.pos_to_string
+local minetest_swap_node = minetest.swap_node
+
+local path = minetest.get_modpath("mcl_ocean_monument") .. "/schematics/ocean_monument.mts"
+
+local water = "mcl_core:water_source"
+local air = "air"
+local ice = "mcl_core:ice"
+
+local leg_materials = {
+	"mcl_ocean:prismarine_brick",
+	"mcl_ocean:prismarine",
+}
+local what_we_can_replace_by_legs = {
+	water,
+	air,
+	"mcl_core:water_flowing",
+	"mcl_core:stone",
+}
+
+local leg_search_quick_index = {}
+for _, v in pairs(leg_materials) do
+	leg_search_quick_index[v] = true
+end
+
+local leg_replace_quick_index = {}
+for _, v in pairs(what_we_can_replace_by_legs) do
+	leg_replace_quick_index[v] = true
+end
+
+local y_wanted = mcl_mapgen.OFFSET_NODES -- supposed to be -32
+local y_bottom = mcl_mapgen.overworld.min -- -62
+
+mcl_mapgen.register_mapgen(function(minp, maxp, seed)
+	local minp = minp
+	local y = minp.y
+	if y ~= y_wanted then return end
+
+	local x, z = minp.x, minp.z
+	local pr = PseudoRandom(seed)
+
+	-- scan the ocean - it should be the ocean:
+	for i = 1, pr:next(10, 100) do
+		local pos = {x = pr:next(15, 64) + x, y = pr:next(0, 25) - 25, z = pr:next(15, 64) + z}
+		local node_name = mcl_mapgen_get_far_node(pos).name
+		if node_name ~= water then return end
+	end
+
+	-- scan nodes above water level - there should be the air:
+	for i = 1, pr:next(10, 100) do
+		local pos = {x = pr:next(0, 79) + x, y = 2, z = pr:next(0,79) + z}
+		local node_name = mcl_mapgen_get_far_node(pos).name
+		if node_name ~= air then return end
+	end
+
+	-- scan ocean surface - allow only water and ice:
+	for i = 1, pr:next(10,100) do
+		local pos = {x=pr:next(0, 79)+x, y=1, z=pr:next(0,79)+z}
+		local node_name = mcl_mapgen_get_far_node(pos).name
+		if node_name ~= water and node_name ~= ice then return end
+	end
+
+	-- random rotation:
+	local rotation = pr:next(0, 3)
+	local rotation_str = tostring(rotation * 90)
+	minetest_place_schematic(minp, path, rotation_str, nil, true)
+
+	-- search prismarine legs at base level and continue them up to the bottom:
+	for x = x, maxp.x do
+		for z = z, maxp.z do
+			local pos = {x = x, y = y, z = z}
+			local node_name = mcl_mapgen_get_far_node(pos).name
+			if leg_search_quick_index[node_name] then
+				local node_leg = {name = node_name}
+				for y = y - 1, y_bottom, -1 do
+					pos.y = y
+					local next_name = mcl_mapgen_get_far_node(pos).name
+					if not leg_replace_quick_index[next_name] then
+						break
+					end
+					minetest_swap_node(pos, node_leg)
+				end
+			end
+		end
+	end
+
+	minetest_log("action", "[mcl_ocean_monument] Placed at " .. minetest_pos_to_string(minp) .. ", " .. rotation_str .. " deg.")
+
+end, mcl_mapgen.order.OCEAN_MONUMENT)

mods/MAPGEN/mcl_ocean_monument/mod.conf

@@ -0,0 +1,4 @@
+name = mcl_ocean_monument
+author = TrashPanda
+description = Adds Ocean Monument, https://git.minetest.land/MineClone2/MineClone2/issues/958#issuecomment-14102
+depends = mcl_mapgen, mcl_structures

mods/MAPGEN/mcl_strongholds/init.lua

@@ -1,106 +0,0 @@
--- Generate strongholds.
-
--- A total of 128 strongholds are generated in rings around the world origin.
--- This is the list of rings, starting with the innermost ring first.
-local stronghold_rings = {
-	-- amount: Number of strongholds in ring.
-	-- min, max: Minimum and maximum distance from (X=0, Z=0).
-	{ amount = 3, min = 1408, max = 2688 },
-	{ amount = 6, min = 4480, max = 5760 },
-	{ amount = 10, min = 7552, max = 8832 },
-	{ amount = 15, min = 10624, max = 11904 },
-	{ amount = 21, min = 13696, max = 14976 },
-	{ amount = 28, min = 16768, max = 18048 },
-	{ amount = 36, min = 19840, max = 21120 },
-	{ amount = 9, min = 22912, max = 24192 },
-}
-
-local strongholds = {}
-local strongholds_inited = false
-
-local mg_name = minetest.get_mapgen_setting("mg_name")
-local superflat = mg_name == "flat" and minetest.get_mapgen_setting("mcl_superflat_classic") == "true"
-
--- Determine the stronghold positions and store them into the strongholds table.
--- The stronghold positions are based on the world seed.
--- The actual position might be offset by a few blocks because it might be shifted
--- to make sure the end portal room is completely within the boundaries of a mapchunk.
-local function init_strongholds()
-	if strongholds_inited then
-		return
-	end
-	-- Don't generate strongholds in singlenode
-	if mg_name == "singlenode" then
-		strongholds_inited = true
-		return
-	end
-	local seed = tonumber(minetest.get_mapgen_setting("seed"))
-	local pr = PseudoRandom(seed)
-	for s=1, #stronghold_rings do
-		local ring = stronghold_rings[s]
-
-		-- Get random angle
-		local angle = pr:next()
-		-- Scale angle to 0 .. 2*math.pi
-		angle = (angle / 32767) * (math.pi*2)
-		for a=1, ring.amount do
-			local dist = pr:next(ring.min, ring.max)
-			local y
-			if superflat then
-				y = mcl_vars.mg_bedrock_overworld_max + 3
-			else
-				y = pr:next(mcl_vars.mg_bedrock_overworld_max+1, mcl_vars.mg_overworld_min+48)
-			end
-			local pos = { x = math.cos(angle) * dist, y = y, z = math.sin(angle) * dist }
-			pos = vector.round(pos)
-			table.insert(strongholds, { pos = pos, generated = false })
-
-			-- Rotate angle by (360 / amount) degrees.
-			-- This will cause the angles to be evenly distributed in the stronghold ring
-			angle = math.fmod(angle + ((math.pi*2) / ring.amount), math.pi*2)
-		end
-	end
-
-	mcl_structures.register_structures("stronghold", table.copy(strongholds))
-
-	strongholds_inited = true
-end
-
--- Stronghold generation for register_on_generated.
-local function generate_strongholds(minp, maxp, blockseed)
-	local pr = PseudoRandom(blockseed)
-	for s=1, #strongholds do
-		if not strongholds[s].generated then
-			local pos = strongholds[s].pos
-			if minp.x <= pos.x and maxp.x >= pos.x and minp.z <= pos.z and maxp.z >= pos.z and minp.y <= pos.y and maxp.y >= pos.y then
-				-- Make sure the end portal room is completely within the current mapchunk
-				-- The original pos is changed intentionally.
-				if pos.x - 6 < minp.x then
-					pos.x = minp.x + 7
-				end
-				if pos.x + 6 > maxp.x then
-					pos.x = maxp.x - 7
-				end
-				if pos.y - 4 < minp.y then
-					pos.y = minp.y + 5
-				end
-				if pos.y + 4 > maxp.y then
-					pos.y = maxp.y - 5
-				end
-				if pos.z - 6 < minp.z then
-					pos.z = minp.z + 7
-				end
-				if pos.z + 6 > maxp.z then
-					pos.z = maxp.z - 7
-				end
-
-				mcl_structures.call_struct(pos, "end_portal_shrine", nil, pr)
-				strongholds[s].generated = true
-			end
-		end
-	end
-end
-
-init_strongholds()
-
-mcl_mapgen_core.register_generator("strongholds", nil, generate_strongholds, 999999)

mods/MAPGEN/mcl_strongholds/mod.conf

@@ -1,4 +0,0 @@
-name = mcl_strongholds
-author = Wuzzy
-description = Generates strongholds with end portals in the Overworld
-depends = mcl_init, mcl_structures, mcl_mapgen_core

mods/MAPGEN/mcl_structures/desert_temple.lua

@@ -0,0 +1,174 @@
+local modname = minetest.get_current_modname()
+local modpath = minetest.get_modpath(modname)
+
+local chance_per_chunk = 11
+local noise_multiplier = 1
+local random_offset    = 999
+local scanning_ratio   = 0.00003
+local struct_threshold = chance_per_chunk - 1
+
+local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level
+
+local node_list = {"mcl_core:sand", "mcl_core:sandstone", "mcl_core:redsand", "mcl_colorblocks:hardened_clay_orange"}
+
+local schematic_file = modpath .. "/schematics/mcl_structures_desert_temple.mts"
+
+local temple_schematic_lua = minetest.serialize_schematic(schematic_file, "lua", {lua_use_comments = false, lua_num_indent_spaces = 0}) .. " return schematic"
+local temple_schematic = loadstring(temple_schematic_lua)()
+
+local red_temple_schematic_lua = minetest.serialize_schematic(schematic_file, "lua", {lua_use_comments = false, lua_num_indent_spaces = 0}) .. " return schematic"
+red_temple_schematic_lua = red_temple_schematic_lua:gsub("mcl_colorblocks:hardened_clay_orange", "mcl_colorblocks:hardened_clay_red")
+red_temple_schematic_lua = red_temple_schematic_lua:gsub("mcl_core:sand_stone", "mcl_colorblocks:hardened_clay_orange")
+red_temple_schematic_lua = red_temple_schematic_lua:gsub("mcl_core:sand", "mcl_core:redsand")
+red_temple_schematic_lua = red_temple_schematic_lua:gsub("mcl_stairs:stair_sandstone", "mcl_stairs:stair_redsandstone")
+red_temple_schematic_lua = red_temple_schematic_lua:gsub("mcl_stairs:slab_sandstone", "mcl_stairs:slab_redsandstone")
+red_temple_schematic_lua = red_temple_schematic_lua:gsub("mcl_colorblocks:hardened_clay_yellow", "mcl_colorblocks:hardened_clay_pink")
+local red_temple_schematic = loadstring(red_temple_schematic_lua)()
+
+local function on_placed(p1, rotation, pr, size)
+	local p2 = {x = p1.x + size.x - 1, y = p1.y + size.y - 1, z = p1.z + size.z - 1}
+	-- Delete cacti leftovers:
+	local cactus_nodes = minetest.find_nodes_in_area_under_air({x = p1.x, y = p1.y + 11, z = p1.z}, {x = p2.x, y = p2.y - 2, z = p2.z}, "mcl_core:cactus", false)
+	for _, pos in pairs(cactus_nodes) do
+		local node_below = minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z})
+		local nn = node_below.name
+		if nn == "mcl_core:sandstone" then
+			minetest.swap_node(pos, {name="air"})
+		end
+	end
+
+	-- Find chests.
+	local chests = minetest.find_nodes_in_area(p1, {x = p2.x, y = p1.y + 5, z = p2.z}, "mcl_chests:chest")
+
+	-- Add desert temple loot into chests
+	for c=1, #chests do
+		local lootitems = mcl_loot.get_multi_loot({
+		{
+			stacks_min = 2,
+			stacks_max = 4,
+			items = {
+				{ itemstring = "mcl_mobitems:bone", weight = 25, amount_min = 4, amount_max=6 },
+				{ itemstring = "mcl_mobitems:rotten_flesh", weight = 25, amount_min = 3, amount_max=7 },
+				{ itemstring = "mcl_mobitems:spider_eye", weight = 25, amount_min = 1, amount_max=3 },
+				{ itemstring = "mcl_books:book", weight = 20, func = function(stack, pr)
+					mcl_enchanting.enchant_uniform_randomly(stack, {"soul_speed"}, pr)
+				end },
+				{ itemstring = "mcl_mobitems:saddle", weight = 20, },
+				{ itemstring = "mcl_core:apple_gold", weight = 20, },
+				{ itemstring = "mcl_core:gold_ingot", weight = 15, amount_min = 2, amount_max = 7 },
+				{ itemstring = "mcl_core:iron_ingot", weight = 15, amount_min = 1, amount_max = 5 },
+				{ itemstring = "mcl_core:emerald", weight = 15, amount_min = 1, amount_max = 3 },
+				{ itemstring = "", weight = 15, },
+				{ itemstring = "mobs_mc:iron_horse_armor", weight = 15, },
+				{ itemstring = "mobs_mc:gold_horse_armor", weight = 10, },
+				{ itemstring = "mobs_mc:diamond_horse_armor", weight = 5, },
+				{ itemstring = "mcl_core:diamond", weight = 5, amount_min = 1, amount_max = 3 },
+				{ itemstring = "mcl_core:apple_gold_enchanted", weight = 2, },
+			}
+		},
+		{
+			stacks_min = 4,
+			stacks_max = 4,
+			items = {
+				{ itemstring = "mcl_mobitems:bone", weight = 10, amount_min = 1, amount_max = 8 },
+				{ itemstring = "mcl_mobitems:rotten_flesh", weight = 10, amount_min = 1, amount_max = 8 },
+				{ itemstring = "mcl_mobitems:gunpowder", weight = 10, amount_min = 1, amount_max = 8 },
+				{ itemstring = "mcl_core:sand", weight = 10, amount_min = 1, amount_max = 8 },
+				{ itemstring = "mcl_mobitems:string", weight = 10, amount_min = 1, amount_max = 8 },
+			}
+		}}, pr)
+		mcl_structures.init_node_construct(chests[c])
+		local meta = minetest.get_meta(chests[c])
+		local inv = meta:get_inventory()
+		mcl_loot.fill_inventory(inv, "main", lootitems, pr)
+	end
+
+	-- Initialize pressure plates and randomly remove up to 5 plates
+	local pplates = minetest.find_nodes_in_area(p1, {x = p2.x, y = p1.y + 5, z = p2.z}, "mesecons_pressureplates:pressure_plate_stone_off")
+	local pplates_remove = 5
+	for p=1, #pplates do
+		if pplates_remove > 0 and pr:next(1, 100) >= 50 then
+			-- Remove plate
+			minetest.remove_node(pplates[p])
+			pplates_remove = pplates_remove - 1
+		else
+			-- Initialize plate
+			minetest.registered_nodes["mesecons_pressureplates:pressure_plate_stone_off"].on_construct(pplates[p])
+		end
+	end
+end
+
+local function place(pos, rotation, pr)
+	local pos_below  = {x = pos.x, y = pos.y -  1, z = pos.z}
+	local pos_temple = {x = pos.x - 10, y = pos.y - 12, z = pos.z - 10}
+	local node_below = minetest.get_node(pos_below)
+	local nn = node_below.name
+	if string.find(nn, "red") then
+		mcl_structures.place_schematic({pos = pos_temple, schematic = red_temple_schematic, pr = pr, on_placed = on_placed})
+	else
+		mcl_structures.place_schematic({pos = pos_temple, schematic = temple_schematic, pr = pr, on_placed = on_placed})
+	end
+end
+
+local function get_place_rank(pos)
+	local x, y, z = pos.x, pos.y - 1, pos.z
+	local p1 = {x = x - 8, y = y, z = z - 8}
+	local p2 = {x = x + 8, y = y, z = z + 8}
+	local best_pos_list_surface = minetest.find_nodes_in_area(p1, p2, node_list, false)
+	local other_pos_list_surface = minetest.find_nodes_in_area(p1, p2, "group:opaque", false)
+	p1 = {x = x - 4, y = y -  7, z = z - 4}
+	p2 = {x = x + 4, y = y -  3, z = z + 4}
+	local best_pos_list_underground = minetest.find_nodes_in_area(p1, p2, node_list, false)
+	local other_pos_list_underground = minetest.find_nodes_in_area(p1, p2, "group:opaque", false)
+	return 10 * (#best_pos_list_surface) + 2 * (#other_pos_list_surface) + 5 * (#best_pos_list_underground) + #other_pos_list_underground
+end
+
+mcl_structures.register_structure({
+	name = "desert_temple",
+	decoration = {
+		deco_type = "simple",
+		place_on = node_list,
+		flags = "all_floors",
+		fill_ratio = scanning_ratio,
+		y_min = 3,
+		y_max = mcl_mapgen.overworld.max,
+		height = 1,
+		biomes = not mcl_mapgen.v6 and {
+			"ColdTaiga_beach",
+			"ColdTaiga_beach_water",
+			"Desert",
+			"Desert_ocean",
+			"ExtremeHills_beach",
+			"FlowerForest_beach",
+			"Forest_beach",
+			"MesaBryce_sandlevel",
+			"MesaPlateauF_sandlevel",
+			"MesaPlateauFM_sandlevel",
+			"Savanna",
+			"Savanna_beach",
+			"StoneBeach",
+			"StoneBeach_ocean",
+			"Taiga_beach",
+		},
+	},
+	on_finished_chunk = function(minp, maxp, seed, vm_context, pos_list)
+		local pr = PseudoRandom(seed + random_offset)
+		local random_number = pr:next(1, chance_per_chunk)
+		local noise = mcl_structures_get_perlin_noise_level(minp) * noise_multiplier
+		if (random_number + noise) < struct_threshold then return end
+		local pos = pos_list[1]
+		if #pos_list > 1 then
+			local count = get_place_rank(pos)
+			for i = 2, #pos_list do
+				local pos_i = pos_list[i]
+				local count_i = get_place_rank(pos_i)
+				if count_i > count then
+					count = count_i
+					pos = pos_i
+				end
+			end
+		end
+		place(pos, nil, pr)
+	end,
+	place_function = place,
+})

mods/MAPGEN/mcl_structures/desert_well.lua

@@ -0,0 +1,93 @@
+local modname = minetest.get_current_modname()
+local modpath = minetest.get_modpath(modname)
+
+local chance_per_chunk = 60
+local noise_multiplier = 1
+local random_offset    = 999
+local scanning_ratio   = 0.00001
+local struct_threshold = chance_per_chunk - 1
+
+local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level
+
+local node_list = {"mcl_core:sand", "mcl_core:sandstone", "mcl_core:redsand", "mcl_colorblocks:hardened_clay_orange"}
+
+local schematic_file = modpath .. "/schematics/mcl_structures_desert_well.mts"
+
+local well_schematic_lua = minetest.serialize_schematic(schematic_file, "lua", {lua_use_comments = false, lua_num_indent_spaces = 0}) .. " return schematic"
+local well_schematic = loadstring(well_schematic_lua)()
+
+local red_well_schematic_lua = minetest.serialize_schematic(schematic_file, "lua", {lua_use_comments = false, lua_num_indent_spaces = 0}) .. " return schematic"
+red_well_schematic_lua = red_well_schematic_lua:gsub("mcl_core:sand", "mcl_core:redsand")
+red_well_schematic_lua = red_well_schematic_lua:gsub("mcl_stairs:slab_sandstone", "mcl_stairs:slab_redsandstone")
+local red_well_schematic = loadstring(red_well_schematic_lua)()
+
+local function place(pos, rotation, pr)
+	local pos_below  = {x = pos.x, y = pos.y - 1, z = pos.z}
+	local pos_well   = {x = pos.x, y = pos.y - 2, z = pos.z}
+	local node_below = minetest.get_node(pos_below)
+	local nn = node_below.name
+	if string.find(nn, "red") then
+		mcl_structures.place_schematic({pos = pos_well, rotaton = rotation, schematic = red_well_schematic, pr = pr})
+	else
+		mcl_structures.place_schematic({pos = pos_well, rotaton = rotation, schematic = well_schematic, pr = pr})
+	end
+end
+
+local function get_place_rank(pos)
+	local x, y, z = pos.x, pos.y - 1, pos.z
+	local p1 = {x = x    , y = y, z = z    }
+	local p2 = {x = x + 5, y = y, z = z + 5}
+	local post_pos_list_surface = #minetest.find_nodes_in_area(p1, p2, node_list, false)
+	local other_pos_list_surface = #minetest.find_nodes_in_area(p1, p2, "group:opaque", false)
+	return post_pos_list_surface * 5 + other_pos_list_surface
+end
+
+mcl_structures.register_structure({
+	name = "desert_well",
+	decoration = {
+		deco_type = "simple",
+		place_on = node_list,
+		flags = "all_floors",
+		fill_ratio = scanning_ratio,
+		y_min = -5,
+		y_max = mcl_mapgen.overworld.max,
+		height = 1,
+		biomes = not mcl_mapgen.v6 and {
+			"ColdTaiga_beach",
+			"ColdTaiga_beach_water",
+			"Desert",
+			"Desert_ocean",
+			"ExtremeHills_beach",
+			"FlowerForest_beach",
+			"Forest_beach",
+			"MesaBryce_sandlevel",
+			"MesaPlateauF_sandlevel",
+			"MesaPlateauFM_sandlevel",
+			"Savanna",
+			"Savanna_beach",
+			"StoneBeach",
+			"StoneBeach_ocean",
+			"Taiga_beach",
+		},
+	},
+	on_finished_chunk = function(minp, maxp, seed, vm_context, pos_list)
+		local pr = PseudoRandom(seed + random_offset)
+		local random_number = pr:next(1, chance_per_chunk)
+		local noise = mcl_structures_get_perlin_noise_level(minp) * noise_multiplier
+		if (random_number + noise) < struct_threshold then return end
+		local pos = pos_list[1]
+		if #pos_list > 1 then
+			local count = get_place_rank(pos)
+			for i = 2, #pos_list do
+				local pos_i = pos_list[i]
+				local count_i = get_place_rank(pos_i)
+				if count_i > count then
+					count = count_i
+					pos = pos_i
+				end
+			end
+		end
+		place(pos, nil, pr)
+	end,
+	place_function = place,
+})

mods/MAPGEN/mcl_structures/end_exit_portal.lua

@@ -0,0 +1,52 @@
+local modname = minetest.get_current_modname()
+local modpath = minetest.get_modpath(modname)
+
+local END_EXIT_PORTAL_POS_X = -3
+local END_EXIT_PORTAL_POS_Y = -27003
+local END_EXIT_PORTAL_POS_Z = -3
+local p0 = {
+	x = END_EXIT_PORTAL_POS_X,
+	y = END_EXIT_PORTAL_POS_Y,
+	z = END_EXIT_PORTAL_POS_Z,
+}
+
+local schematic = modpath .. "/schematics/mcl_structures_end_exit_portal.mts"
+
+local function place(pos, rotation, pr)
+	mcl_structures.place_schematic({pos = pos, schematic = schematic, rotation = rotation, pr = pr})
+end
+
+mcl_mapgen.register_mapgen(function(minp, maxp, seed, vm_context)
+	local minp = minp
+	local y1 = minp.y
+	if y1 > END_EXIT_PORTAL_POS_Y then return end
+	local maxp = maxp
+	local y2 = maxp.y
+	if y2 < END_EXIT_PORTAL_POS_Y then return end
+	if minp.x > END_EXIT_PORTAL_POS_X then return end
+	if maxp.x < END_EXIT_PORTAL_POS_X then return end
+	if minp.z > END_EXIT_PORTAL_POS_Z then return end
+	if maxp.z < END_EXIT_PORTAL_POS_Z then return end
+
+	local p = table.copy(p0)
+
+	for y = y2, y1, -1 do
+		p.y = y
+		if minetest.get_node(p).name == "mcl_end:end_stone" then
+			place(p, "0", PseudoRandom(vm_context.chunkseed))
+			return
+		end
+	end
+
+	for y = y2, y1, -1 do
+		p.y = y
+		if minetest.get_node(p).name ~= "air" then
+			place(p, "0", PseudoRandom(vm_context.chunkseed))
+			return
+		end
+	end
+
+	place(p0, "0", PseudoRandom(vm_context.chunkseed))
+end)
+
+mcl_structures.register_structure({name = "end_exit_portal", place_function = place})

mods/MAPGEN/mcl_structures/fossil.lua

@@ -0,0 +1,53 @@
+local modname = minetest.get_current_modname()
+local modpath = minetest.get_modpath(modname)
+
+local chance_per_block = mcl_structures.from_16x16_to_block_inverted_chance(64)
+local noise_multiplier = 2
+local random_offset    = 5
+local struct_threshold = chance_per_block - 1
+local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level
+local minetest_find_nodes_in_area = minetest.find_nodes_in_area
+local min_y = mcl_worlds.layer_to_y(40)
+local max_y = mcl_worlds.layer_to_y(49)
+local fossils = {
+	"mcl_structures_fossil_skull_1.mts", -- 4×5×5
+	"mcl_structures_fossil_skull_2.mts", -- 5×5×5
+	"mcl_structures_fossil_skull_3.mts", -- 5×5×7
+	"mcl_structures_fossil_skull_4.mts", -- 7×5×5
+	"mcl_structures_fossil_spine_1.mts", -- 3×3×13
+	"mcl_structures_fossil_spine_2.mts", -- 5×4×13
+	"mcl_structures_fossil_spine_3.mts", -- 7×4×13
+	"mcl_structures_fossil_spine_4.mts", -- 8×5×13
+}
+local nodes_for_fossil = {"mcl_core:sandstone", "mcl_core:stone", "mcl_core:diorite", "mcl_core:andesite", "mcl_core:granite", "mcl_core:stone_with_coal", "mcl_core:dirt", "mcl_core:gravel"}
+
+function spawn_fossil(pos, rotation, pr, placer)
+	-- Generates one out of 8 possible fossil pieces
+	local def = {
+		pos       = {x = pos.x, y = pos.y - 1, z = pos.z},
+		schematic = modpath .. "/schematics/" .. fossils[pr:next(1, #fossils)],
+		rotation  = rotation,
+		pr        = pr,
+	}
+	mcl_structures.place_schematic(def)
+end
+
+mcl_mapgen.register_mapgen_block(function(minp, maxp, seed)
+	local p1 = table.copy(minp)
+	local y1 = p1.y
+	if y1 > max_y then return end
+	local p2 = table.copy(maxp)
+	local y2 = p2.y
+	if y2 < min_y then return end
+	local pr = PseudoRandom(seed + random_offset)
+	local random_number = pr:next(1, chance_per_block)
+	p1.y = math.max(y1, min_y)
+	local noise = mcl_structures_get_perlin_noise_level(p1) * noise_multiplier
+	if (random_number + noise) < struct_threshold then return end
+	p2.y = math.min(y2, max_y)
+	local nodes = minetest_find_nodes_in_area(p1, p2, nodes_for_fossil, false)
+	if #nodes < 100 then return end
+	spawn_fossil(p1, nil, pr)
+end, 1000)
+
+mcl_structures.register_structure({name = 'fossil', place_function = spawn_fossil})

mods/MAPGEN/mcl_structures/ice_spike_large.lua

@@ -0,0 +1,66 @@
+local modname = minetest.get_current_modname()
+local modpath = minetest.get_modpath(modname)
+
+local chance_per_chunk = 5
+local random_offset    = 24435
+local struct_threshold = chance_per_chunk - 1
+local noise_params = {
+	offset = 0,
+	scale  = 1,
+	spread = {
+		x = 1000,
+		y = 1000,
+		z = 1000,
+	},
+	scale = 0.01,
+	seed = 29313,
+	octaves = 2,
+	persistence = 0.7,
+}
+
+local node_list = {"mcl_core:snowblock", "mcl_core:dirt_with_grass_snow"}
+local schematic = modpath.."/schematics/mcl_structures_ice_spike_large.mts"
+
+minetest_find_nodes_in_area = minetest.find_nodes_in_area
+
+local function place(pos, rotation, pr)
+	mcl_structures.place_schematic({pos = pos, schematic = schematic, rotation = rotation, pr = pr})
+end
+
+local function is_place_ok(p)
+	-- Check surface
+	local floor = {x=p.x+4, y=p.y-1, z=p.z+4}
+	local surface = #minetest_find_nodes_in_area({x=p.x+1,y=p.y-1,z=p.z+1}, floor, node_list, false)
+	if surface < 9 then return end
+
+	-- Check for collision with spruce
+	local spruce_collisions = #minetest_find_nodes_in_area({x=p.x+1,y=p.y+2,z=p.z+1}, {x=p.x+4, y=p.y+6, z=p.z+4}, {"group:tree"}, false)
+	if spruce_collisions > 0 then return end
+
+	return true
+end
+
+local def = mcl_mapgen.v6 and {
+	decoration = {
+		deco_type = "simple",
+		place_on = node_list,
+		noise_params = noise_params,
+		y_min = mcl_mapgen.overworld.min,
+		y_max = mcl_mapgen.overworld.max,
+		height = 1,
+	},
+	on_finished_chunk = mcl_mapgen.v6 and function(minp, maxp, seed, vm_context, pos_list)
+		local pr = PseudoRandom(seed + random_offset)
+		local random_number = pr:next(1, chance_per_chunk)
+		if random_number < struct_threshold then return end
+		for i = 1, #pos_list do
+			local pos = pos_list[i]
+			if is_place_ok(pos) then
+				place(pos, nil, pr)
+			end
+		end
+	end,
+} or {}
+def.name = "ice_spike_large"
+def.place_function = place
+mcl_structures.register_structure(def)

mods/MAPGEN/mcl_structures/ice_spike_small.lua

@@ -0,0 +1,65 @@
+local modname = minetest.get_current_modname()
+local modpath = minetest.get_modpath(modname)
+
+local chance_per_chunk = 3
+local random_offset    = 1264
+local struct_threshold = chance_per_chunk - 1
+local noise_params = {
+	offset = 0,
+	scale  = 1,
+	spread = {
+		x = mcl_mapgen.CS,
+		y = mcl_mapgen.CS,
+		z = mcl_mapgen.CS,
+	},
+	scale = 0.3,
+	seed = 32931,
+	octaves = 2,
+	persistence = 0.7,
+}
+
+local node_list = {"mcl_core:snowblock", "mcl_core:dirt_with_grass_snow"}
+local schematic = modpath.."/schematics/mcl_structures_ice_spike_small.mts"
+
+minetest_find_nodes_in_area = minetest.find_nodes_in_area
+
+local function place(pos, rotation, pr)
+	mcl_structures.place_schematic({pos = pos, schematic = schematic, rotation = rotation, pr = pr})
+end
+
+local function is_place_ok(p)
+	local floor = {x=p.x+6, y=p.y-1, z=p.z+6}
+	local surface = #minetest_find_nodes_in_area({x=p.x+1,y=p.y-1,z=p.z+1}, floor, node_list, false)
+	if surface < 25 then return end
+
+	-- Check for collision with spruce
+	local spruce_collisions = #minetest_find_nodes_in_area({x=p.x+1,y=p.y+1,z=p.z+1}, {x=p.x+6, y=p.y+6, z=p.z+6}, {"group:tree"}, false)
+	if spruce_collisions > 0 then return end
+
+	return true
+end
+
+local def = mcl_mapgen.v6 and {
+	decoration = {
+		deco_type = "simple",
+		place_on = node_list,
+		noise_params = noise_params,
+		y_min = mcl_mapgen.overworld.min,
+		y_max = mcl_mapgen.overworld.max,
+		height = 1,
+	},
+	on_finished_chunk = mcl_mapgen.v6 and function(minp, maxp, seed, vm_context, pos_list)
+		local pr = PseudoRandom(seed + random_offset)
+		local random_number = pr:next(1, chance_per_chunk)
+		if random_number < struct_threshold then return end
+		for i = 1, #pos_list do
+			local pos = pos_list[i]
+			if is_place_ok(pos) then
+				place(pos, nil, pr)
+			end
+		end
+	end,
+} or {}
+def.name = "ice_spike_small"
+def.place_function = place
+mcl_structures.register_structure(def)

mods/MAPGEN/mcl_structures/igloo.lua

@@ -0,0 +1,195 @@
+local modname = minetest.get_current_modname()
+local modpath = minetest.get_modpath(modname)
+
+-- local chance_per_chunk = mcl_structures.from_16x16_to_chunk_inverted_chance(4400)
+local chance_per_chunk = 100
+local noise_multiplier = 1.4
+local random_offset    = 555
+local struct_threshold = chance_per_chunk - 1
+local scanning_ratio   = 0.0003
+
+local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level
+
+local node_list = {"mcl_core:snowblock", "mcl_core:snow", "group:grass_block_snow"}
+
+local schematic_top      = modpath.."/schematics/mcl_structures_igloo_top.mts"
+local schematic_basement = modpath.."/schematics/mcl_structures_igloo_basement.mts"
+
+local brick = {
+	-- monster egg:
+	[false] = {
+		-- cracked:
+		[false] = "mcl_core:stonebrick",
+		[true ] = "mcl_core:stonebrickcracked",
+	},
+	[true] = {
+		[false] = "mcl_monster_eggs:monster_egg_stonebrick",
+		[true ] = "mcl_monster_eggs:monster_egg_stonebrickcracked",
+	},
+}
+local dirs = {
+	["0"]   = {x=-1, y=0, z= 0},
+	["90"]  = {x= 0, y=0, z=-1},
+	["180"] = {x= 1, y=0, z= 0},
+	["270"] = {x= 0, y=0, z= 1},
+}
+local tdirs = {
+	["0"]   = {x= 1, y=0, z= 0},
+	["90"]  = {x= 0, y=0, z=-1},
+	["180"] = {x=-1, y=0, z= 0},
+	["270"] = {x= 0, y=0, z= 1}
+}
+local tposes = {
+	["0"]   = {x=7, y=-1, z=3},
+	["90"]  = {x=3, y=-1, z=1},
+	["180"] = {x=1, y=-1, z=3},
+	["270"] = {x=3, y=-1, z=7},
+}
+local chest_offsets = {
+	["0"]   = {x=5, y=1, z=5},
+	["90"]  = {x=5, y=1, z=3},
+	["180"] = {x=3, y=1, z=1},
+	["270"] = {x=1, y=1, z=5},
+}
+
+local function on_placed(pos, rotation, pr, size)
+	local chest_offset = chest_offsets[rotation]
+	if not chest_offset then return end
+	local lootitems = mcl_loot.get_multi_loot({
+	{
+		stacks_min = 1,
+		stacks_max = 1,
+		items = {
+			{ itemstring = "mcl_core:apple_gold", weight = 1 },
+		}
+	},
+	{
+		stacks_min = 2,
+		stacks_max = 8,
+		items = {
+			{ itemstring = "mcl_core:coal_lump", weight = 15, amount_min = 1, amount_max = 4 },
+			{ itemstring = "mcl_core:apple", weight = 15, amount_min = 1, amount_max = 3 },
+			{ itemstring = "mcl_farming:wheat_item", weight = 10, amount_min = 2, amount_max = 3 },
+			{ itemstring = "mcl_core:gold_nugget", weight = 10, amount_min = 1, amount_max = 3 },
+			{ itemstring = "mcl_mobitems:rotten_flesh", weight = 10 },
+			{ itemstring = "mcl_tools:axe_stone", weight = 2 },
+			{ itemstring = "mcl_core:emerald", weight = 1 },
+		}
+	}}, pr)
+
+	local chest_pos = vector.add(pos, chest_offset)
+	mcl_structures.init_node_construct(chest_pos)
+	local meta = minetest.get_meta(chest_pos)
+	local inv = meta:get_inventory()
+	mcl_loot.fill_inventory(inv, "main", lootitems, pr)
+end
+
+local function on_placed_top(p1, rotation, pr, size)
+	local y = p1.y + 1
+	local pos = {x = p1.x, y = y, z = p1.z}
+	local dim = mcl_mapgen[mcl_worlds.pos_to_dimension(pos)]
+	local bottom_of_dimension = (dim and dim.min or mcl_mapgen.EDGE_MIN) + 10
+	local bottom_of_chunk = mcl_mapgen.get_chunk_beginning(y)
+	local buffer = y - math.max(bottom_of_chunk, bottom_of_dimension)
+	if buffer < 20 then return end
+
+	local depth = pr:next(19, buffer)
+	local bpos = {x=pos.x, y=pos.y-depth, z=pos.z}
+	local dir = dirs[rotation]
+	if not dir then return end
+	local tdir = tdirs[rotation]
+
+	-- Trapdoor position
+	local tpos = vector.add(pos, tposes[rotation])
+	local ladder_param2 = minetest.dir_to_wallmounted(tdir)
+
+	-- Check how deep we can actuall dig
+	local real_depth = 0
+	for y = 1, depth - 5 do
+		local node = minetest.get_node({x=tpos.x,y=tpos.y-y,z=tpos.z})
+		local def = minetest.registered_nodes[node.name]
+		if (not def) or (not def.walkable) or (def.liquidtype ~= "none") then
+			bpos.y = tpos.y-y+1
+			break
+		end
+		real_depth = real_depth + 1
+	end
+	if real_depth < 6 then return end
+
+	-- Generate ladder to basement
+	for y=1, real_depth-1 do
+		minetest.set_node({x=tpos.x-1,y=tpos.y-y,z=tpos.z  }, {name = brick[pr:next(1, 10) == 1][pr:next(1, 3) == 1]})
+		minetest.set_node({x=tpos.x+1,y=tpos.y-y,z=tpos.z  }, {name = brick[pr:next(1, 10) == 1][pr:next(1, 3) == 1]})
+		minetest.set_node({x=tpos.x  ,y=tpos.y-y,z=tpos.z-1}, {name = brick[pr:next(1, 10) == 1][pr:next(1, 3) == 1]})
+		minetest.set_node({x=tpos.x  ,y=tpos.y-y,z=tpos.z+1}, {name = brick[pr:next(1, 10) == 1][pr:next(1, 3) == 1]})
+		minetest.set_node({x=tpos.x  ,y=tpos.y-y,z=tpos.z  }, {name="mcl_core:ladder", param2=ladder_param2})
+	end
+
+	-- Place basement
+	local def = {
+		pos = bpos,
+		schematic = schematic_basement,
+		rotation = rotation,
+		pr = pr,
+		on_placed = on_placed,
+	}
+	mcl_structures.place_schematic(def)
+
+	minetest.after(5, function(tpos, dir)
+		minetest.swap_node(tpos, {name="mcl_doors:trapdoor", param2=20+minetest.dir_to_facedir(dir)}) -- TODO: more reliable param2
+	end, tpos, dir)
+end
+
+local function place(pos, rotation, pr)
+	local def = {
+		pos = {x = pos.x, y = pos.y - 1, z = pos.z},
+		schematic = schematic_top,
+		rotation = rotation or tostring(pr:next(0,3)*90),
+		pr = pr,
+		on_placed = on_placed_top,
+	}
+	-- FIXME: This spawns bookshelf instead of furnace. Fix this!
+	-- Furnace does not work atm because apparently meta is not set. :-(
+	mcl_structures.place_schematic(def)
+end
+
+local function get_place_rank(pos)
+	local x, y, z = pos.x, pos.y, pos.z
+	local p1 = {x = x    , y = y, z = z    }
+	local p2 = {x = x + 9, y = y, z = z + 9}
+	local best_pos_list_surface = #minetest.find_nodes_in_area(p1, p2, node_list, false)
+	local other_pos_list_surface = #minetest.find_nodes_in_area(p1, p2, "group:opaque", false)
+	return 10 * (best_pos_list_surface) + other_pos_list_surface - 640
+end
+
+mcl_structures.register_structure({
+	name = "igloo",
+	decoration = {
+		deco_type = "simple",
+		place_on = node_list,
+		flags = "all_floors",
+		fill_ratio = scanning_ratio,
+		y_min = -33,
+		y_max = mcl_mapgen.overworld.max,
+		height = 1,
+	},
+	on_finished_chunk = function(minp, maxp, seed, vm_context, pos_list)
+		local pr = PseudoRandom(seed + random_offset)
+		local random_number = pr:next(1, chance_per_chunk)
+		local noise = mcl_structures_get_perlin_noise_level(minp) * noise_multiplier
+		if (random_number + noise) < struct_threshold then return end
+		local pos
+		local count = -1
+		for i = 1, #pos_list do
+			local pos_i = vector.subtract(pos_list[i], {x = 4, y = 1, z = 4})
+			local count_i = get_place_rank(pos_i)
+			if count_i > count then
+				count = count_i
+				pos = pos_i
+			end
+		end
+		if count < 0 then return end
+		place(pos, nil, pr)
+	end,
+	place_function = place,
+})

mods/MAPGEN/mcl_structures/init.lua

@@ -2,44 +2,307 @@ local modname = minetest.get_current_modname()
 local S = minetest.get_translator(modname)
 local modpath = minetest.get_modpath(modname)
 
-mcl_structures = {}
+local name_prefix = "mcl_structures:"
 
+mcl_structures = {}
 local rotations = {
 	"0",
 	"90",
 	"180",
 	"270"
 }
+local registered_structures = {}
+local use_process_mapgen_block_lvm = false
+local use_process_mapgen_chunk = false
+local on_finished_block_callbacks = {}
+local on_finished_chunk_callbacks = {}
 
-local function ecb_place(blockpos, action, calls_remaining, param)
+local noise_params = {
-	if calls_remaining >= 1 then return end
+	offset = 0,
-	minetest.place_schematic(param.pos, param.schematic, param.rotation, param.replacements, param.force_placement, param.flags)
+	scale  = 1,
-	if param.after_placement_callback and param.p1 and param.p2 then
+	spread = {
-		param.after_placement_callback(param.p1, param.p2, param.size, param.rotation, param.pr, param.callback_param)
+		x = mcl_mapgen.CS_NODES,
+		y = mcl_mapgen.CS_NODES,
+		z = mcl_mapgen.CS_NODES,
+	},
+	seed = 329,
+	octaves = 1,
+	persistence = 0.6,
+}
+
+local perlin_noise
+local get_perlin_noise_level = function(minp)
+	perlin_noise = perlin_noise or minetest.get_perlin(noise_params)
+	return perlin_noise:get_3d(minp)
+end
+mcl_structures.get_perlin_noise_level = get_perlin_noise_level
+
+local spawnstruct_hint = S("Use /help spawnstruct to see a list of avaiable types.")
+
+local function dir_to_rotation(dir)
+	local ax, az = math.abs(dir.x), math.abs(dir.z)
+	if ax > az then
+		if dir.x < 0 then
+			return "270"
+		end
+		return "90"
+	end
+	if dir.z < 0 then
+		return "180"
+	end
+	return "0"
+end
+
+local function spawnstruct_function(name, param)
+	local player = minetest.get_player_by_name(name)
+	if not player then return end
+	if param == "" then
+		minetest.chat_send_player(name, S("Error: No structure type given. Please use “/spawnstruct <type>”."))
+		minetest.chat_send_player(name, spawnstruct_hint)
+		return
+	end
+	local struct = registered_structures[param]
+	if not struct then
+		struct = registered_structures[name_prefix .. param]
+	end
+	if not struct then
+		minetest.chat_send_player(name, S("Error: Unknown structure type. Please use “/spawnstruct <type>”."))
+		minetest.chat_send_player(name, spawnstruct_hint)
+		return
+	end
+	local place = struct.place_function
+	if not place then return end
+
+	local pos = player:get_pos()
+	if not pos then return end
+	local pr = PseudoRandom(math.floor(pos.x * 333 + pos.y * 19 - pos.z + 4))
+	pos = vector.round(pos)
+	local dir = minetest.yaw_to_dir(player:get_look_horizontal())
+	local rot = dir_to_rotation(dir)
+	place(pos, rot, pr, player)
+	minetest.chat_send_player(name, S("Structure placed."))
+end
+
+local function update_spawnstruct_chatcommand()
+	local spawnstruct_params = ""
+	for _, registered_structure in pairs(registered_structures) do
+		if spawnstruct_params ~= "" then
+			spawnstruct_params = spawnstruct_params .. " | "
+		end
+		spawnstruct_params = spawnstruct_params .. registered_structure.short_name
+	end
+	local def = {
+		params = spawnstruct_params,
+		description = S("Generate a pre-defined structure near your position."),
+		privs = {debug = true},
+		func = spawnstruct_function,
+	}
+	local registered_chatcommands = minetest.registered_chatcommands
+	if registered_chatcommands["spawnstruct"] then
+		minetest.override_chatcommand("spawnstruct", def)
+	else
+		minetest.register_chatcommand("spawnstruct", def)
 	end
 end
 
-function mcl_structures.place_schematic(pos, schematic, rotation, replacements, force_placement, flags, after_placement_callback, pr, callback_param)
+function process_mapgen_block_lvm(vm_context)
-	local s = loadstring(minetest.serialize_schematic(schematic, "lua", {lua_use_comments = false, lua_num_indent_spaces = 0}) .. " return schematic")()
+	local nodes = minetest.find_nodes_in_area(vm_context.minp, vm_context.maxp, {"group:struct"}, true)
-	if s and s.size then
+	for node_name, pos_list in pairs(nodes) do
-		local x, z = s.size.x, s.size.z
+		local lvm_callback = on_finished_block_callbacks[node_name]
-		if rotation then
+		if lvm_callback then
-			if rotation == "random" and pr then
+			lvm_callback(vm_context, pos_list)
+		end
+	end
+end
+
+function process_mapgen_chunk(minp, maxp, seed, vm_context)
+	local nodes = minetest.find_nodes_in_area(minp, maxp, {"group:struct"}, true)
+	for node_name, pos_list in pairs(nodes) do
+		local chunk_callback = on_finished_chunk_callbacks[node_name]
+		if chunk_callback then
+			chunk_callback(minp, maxp, seed, vm_context, pos_list)
+		end
+	end
+	for node_name, pos_list in pairs(nodes) do
+		for _, pos in pairs(pos_list) do
+			local node = minetest.get_node(pos)
+			if string.sub(node.name, 1, 15) == 'mcl_structures:' then
+				minetest.swap_node(pos, {name = 'air'})
+			end
+		end
+	end
+end
+
+--------------------------------------------------------------------------------------
+-- mcl_structures.register_structure(struct_def)
+-- struct_def:
+--	name              - name, like 'desert_temple'
+--	decoration        - decoration definition, to use as structure seed (thanks cora for the idea)
+--	on_finished_block - callback, if needed, to use with decorations: funcion(vm_context, pos_list)
+--	on_finished_chunk - next callback if needed: funcion(minp, maxp, seed, vm_context, pos_list)
+--	place_function    - callback to place schematic by /spawnstruct debug command: function(pos, rotation, pr, placer)
+--	on_placed         - useful when you want to process the area after placement: function(pos, rotation, pr, size)
+function mcl_structures.register_structure(def)
+	local short_name         = def.name
+	local name               = "mcl_structures:" .. short_name
+	local decoration         = def.decoration
+	local on_finished_block  = def.on_finished_block
+	local on_finished_chunk  = def.on_finished_chunk
+	local place_function     = def.place_function
+	if not name then
+		minetest.log('warning', 'Structure name is not passed for registration - ignoring')
+		return
+	end
+	if registered_structures[name] then
+		minetest.log('warning', 'Structure '..name..' is already registered - owerwriting')
+	end
+	local decoration_id
+	if decoration then
+		minetest.register_node(':' .. name, {
+			drawtype            = "airlike",
+			sunlight_propagates = true,
+			pointable           = false,
+			walkable            = false,
+			diggable            = false,
+			buildable_to        = true,
+			groups              = {
+				struct                    = 1,
+				not_in_creative_inventory = 1,
+			},
+		})
+		decoration_id = minetest.register_decoration({
+			deco_type      = decoration.deco_type,
+			place_on       = decoration.place_on,
+			sidelen        = decoration.sidelen,
+			fill_ratio     = decoration.fill_ratio,
+			noise_params   = decoration.noise_params,
+			biomes         = decoration.biomes,
+			y_min          = decoration.y_min,
+			y_max          = decoration.y_max,
+			spawn_by       = decoration.spawn_by,
+			num_spawn_by   = decoration.num_spawn_by,
+			flags          = decoration.flags,
+			decoration     = name,
+			height         = decoration.height,
+			height_max     = decoration.height_max,
+			param2         = decoration.param2,
+			param2_max     = decoration.param2_max,
+			place_offset_y = decoration.place_offset_y,
+			schematic      = decoration.schematic,
+			replacements   = decoration.replacements,
+			flags          = decoration.flags,
+			rotation       = decoration.rotation,
+		})
+	end
+	registered_structures[name] = {
+		place_function    = place_function,
+		on_finished_block = on_finished_block,
+		on_finished_chunk = on_finished_chunk,
+		decoration_id     = decoration_id,
+		short_name        = short_name,
+	}
+	update_spawnstruct_chatcommand()
+	if on_finished_block then
+		on_finished_block_callbacks[name] = on_finished_block
+		if not use_process_mapgen_block_lvm then
+			use_process_mapgen_block_lvm = true
+			mcl_mapgen.register_mapgen_block_lvm(process_mapgen_block_lvm, mcl_mapgen.order.BUILDINGS)
+		end
+	end
+	if on_finished_chunk then
+		on_finished_chunk_callbacks[name] = on_finished_chunk
+		if not use_process_mapgen_chunk then
+			use_process_mapgen_chunk = true
+			mcl_mapgen.register_mapgen(process_mapgen_chunk, mcl_mapgen.order.BUILDINGS)
+		end
+	end
+end
+
+-- It doesN'T remove registered node and decoration!
+function mcl_structures.unregister_structure(name)
+	if not registered_structures[name] then
+		minetest.log('warning','Structure '..name..' is not registered - skipping')
+		return
+	end
+	registered_structures[name] = nil
+end
+
+local function ecb_place(blockpos, action, calls_remaining, param)
+	if calls_remaining >= 1 then return end
+	local pos = param.pos
+	local rotation = param.rotation
+	minetest.place_schematic(pos, param.schematic, rotation, param.replacements, param.force_placement, param.flags)
+	local on_placed = param.on_placed
+	if not on_placed then
+		return
+	end
+	on_placed(pos, rotation, param.pr, param.size)
+end
+
+function mcl_structures.place_schematic(def)
+	local pos       = def.pos
+	local schematic = def.schematic
+	local rotation  = def.rotation
+	local pr        = def.pr
+	local on_placed = def.on_placed -- on_placed(pos, rotation, pr, size)
+	local emerge    = def.emerge
+	if not pos then
+		minetest.log('warning', '[mcl_structures] No pos. specified to place schematic')
+		return
+	end
+	if not schematic then
+		minetest.log('warning', '[mcl_structures] No schematic specified to place at ' .. minetest.pos_to_string(pos))
+		return
+	end
+	if not rotation or rotation == 'random' then
+		if pr then
 			rotation = rotations[pr:next(1,#rotations)]
-			end
+		else
-			if rotation == "random" then
+			rotation = rotations[math.random(1,#rotations)]
-				x = math.max(x, z)
-				z = x
-			elseif rotation == "90" or rotation == "270" then
-				x, z = z, x
 		end
 	end
-		local p1 = {x=pos.x    , y=pos.y           , z=pos.z    }
+
-		local p2 = {x=pos.x+x-1, y=pos.y+s.size.y-1, z=pos.z+z-1}
+	if not emerge and not on_placed then
-		minetest.log("verbose", "[mcl_structures] size=" ..minetest.pos_to_string(s.size) .. ", rotation=" .. tostring(rotation) .. ", emerge from "..minetest.pos_to_string(p1) .. " to " .. minetest.pos_to_string(p2))
+		minetest.place_schematic(pos, schematic, rotation, def.replacements, def.force_placement, def.flags)
-		local param = {pos=vector.new(pos), schematic=s, rotation=rotation, replacements=replacements, force_placement=force_placement, flags=flags, p1=p1, p2=p2, after_placement_callback = after_placement_callback, size=vector.new(s.size), pr=pr, callback_param=callback_param}
+		return
-		minetest.emerge_area(p1, p2, ecb_place, param)
 	end
+
+	local serialized_schematic = minetest.serialize_schematic(schematic, "lua", {lua_use_comments = false, lua_num_indent_spaces = 0}) .. " return schematic"
+	local loaded_schematic = loadstring(serialized_schematic)()
+	if not loaded_schematic then
+		minetest.log('warning', '[mcl_structures] Schematic ' .. schematic .. ' load serialized string problem at ' .. minetest.pos_to_string(pos))
+		return
+	end
+	local size = loaded_schematic.size
+	if not size then
+		minetest.log('warning', '[mcl_structures] Schematic ' .. schematic .. ' has no size at ' .. minetest.pos_to_string(pos))
+		return
+	end
+	local size_x, size_y, size_z = size.x, size.y, size.z
+	if rotation == "90" or rotation == "270" then
+		size_x, size_z = size_z, size_x
+	end
+	local x, y, z = pos.x, pos.y, pos.z
+	local p1 = {x = x, y = y, z = z}
+	local p2 = {x = x + size_x - 1, y = y + size_y - 1, z = size_z - 1}
+	local ecb_param = {
+		pos             = vector.new(pos),
+		schematic       = loaded_schematic,
+		rotation        = rotation,
+		replacements    = replacements,
+		force_placement = force_placement,
+		flags           = flags,
+		size            = vector.new(size),
+		pr              = pr,
+		on_placed       = on_placed,
+	}
+	if not emerge then
+		ecb_place(p1, nil, 0, ecb_param)
+		return
+	end
+	minetest.log("verbose", "[mcl_structures] Emerge area " .. minetest.pos_to_string(p1) .. " - " .. minetest.pos_to_string(p2)
+		.. " of size " ..minetest.pos_to_string(size) .. " to place " .. schematic .. ", rotation " .. tostring(rotation))
+	minetest.emerge_area(p1, p2, ecb_place, ecb_param)
 end
 
 function mcl_structures.get_struct(file)
@@ -58,7 +321,7 @@ end
 
 -- Call on_construct on pos.
 -- Useful to init chests from formspec.
-local function init_node_construct(pos)
+function mcl_structures.init_node_construct(pos)
 	local node = minetest.get_node(pos)
 	local def = minetest.registered_nodes[node.name]
 	if def and def.on_construct then
@@ -69,200 +332,42 @@ local function init_node_construct(pos)
 end
 
 -- The call of Struct
-function mcl_structures.call_struct(pos, struct_style, rotation, pr)
+function mcl_structures.call_struct(pos, struct_style, rotation, pr, callback)
 	minetest.log("action","[mcl_structures] call_struct " .. struct_style.." at "..minetest.pos_to_string(pos))
 	if not rotation then
 		rotation = "random"
 	end
-	if struct_style == "desert_temple" then
+	if struct_style == "witch_hut" then
-		return mcl_structures.generate_desert_temple(pos, rotation, pr)
-	elseif struct_style == "desert_well" then
-		return mcl_structures.generate_desert_well(pos, rotation)
-	elseif struct_style == "igloo" then
-		return mcl_structures.generate_igloo(pos, rotation, pr)
-	elseif struct_style == "witch_hut" then
 		return mcl_structures.generate_witch_hut(pos, rotation)
-	elseif struct_style == "ice_spike_small" then
-		return mcl_structures.generate_ice_spike_small(pos, rotation)
-	elseif struct_style == "ice_spike_large" then
-		return mcl_structures.generate_ice_spike_large(pos, rotation)
 	elseif struct_style == "boulder" then
 		return mcl_structures.generate_boulder(pos, rotation, pr)
-	elseif struct_style == "fossil" then
-		return mcl_structures.generate_fossil(pos, rotation, pr)
 	elseif struct_style == "end_exit_portal" then
-		return mcl_structures.generate_end_exit_portal(pos, rotation)
+		return mcl_structures.generate_end_exit_portal(pos, rotation, pr, callback)
 	elseif struct_style == "end_exit_portal_open" then
 		return mcl_structures.generate_end_exit_portal_open(pos, rotation)
 	elseif struct_style == "end_gateway_portal" then
 		return mcl_structures.generate_end_gateway_portal(pos, rotation)
 	elseif struct_style == "end_portal_shrine" then
 		return mcl_structures.generate_end_portal_shrine(pos, rotation, pr)
+	elseif struct_style == "end_portal" then
+		return mcl_structures.generate_end_portal(pos, rotation, pr)
 	end
 end
 
-function mcl_structures.generate_desert_well(pos, rot)
+function mcl_structures.generate_end_portal(pos, rotation, pr)
-	local newpos = {x=pos.x,y=pos.y-2,z=pos.z}
+	-- todo: proper facedir
-	local path = modpath.."/schematics/mcl_structures_desert_well.mts"
+	local x0, y0, z0 = pos.x - 2, pos.y, pos.z - 2
-	return mcl_structures.place_schematic(newpos, path, rot or "0", nil, true)
+	for x = 0, 4 do
-end
+		for z = 0, 4 do
-
+			if x % 4 == 0 or z % 4 == 0 then
-function mcl_structures.generate_igloo(pos, rotation, pr)
+				if x % 4 ~= 0 or z % 4 ~= 0 then
-	-- Place igloo
+					minetest.swap_node({x = x0 + x, y = y0, z = z0 + z}, {name = "mcl_portals:end_portal_frame_eye"})
-	local success, rotation = mcl_structures.generate_igloo_top(pos, pr)
-	-- Place igloo basement with 50% chance
-	local r = pr:next(1,2)
-	if r == 1 then
-		-- Select basement depth
-		local dim = mcl_worlds.pos_to_dimension(pos)
-		--local buffer = pos.y - (mcl_vars.mg_lava_overworld_max + 10)
-		local buffer
-		if dim == "nether" then
-			buffer = pos.y - (mcl_vars.mg_lava_nether_max + 10)
-		elseif dim == "end" then
-			buffer = pos.y - (mcl_vars.mg_end_min + 1)
-		elseif dim == "overworld" then
-			buffer = pos.y - (mcl_vars.mg_lava_overworld_max + 10)
-		else
-			return success
-		end
-		if buffer <= 19 then
-			return success
-		end
-		local depth = pr:next(19, buffer)
-		local bpos = {x=pos.x, y=pos.y-depth, z=pos.z}
-		-- trapdoor position
-		local tpos
-		local dir, tdir
-		if rotation == "0" then
-			dir = {x=-1, y=0, z=0}
-			tdir = {x=1, y=0, z=0}
-			tpos = {x=pos.x+7, y=pos.y-1, z=pos.z+3}
-		elseif rotation == "90" then
-			dir = {x=0, y=0, z=-1}
-			tdir = {x=0, y=0, z=-1}
-			tpos = {x=pos.x+3, y=pos.y-1, z=pos.z+1}
-		elseif rotation == "180" then
-			dir = {x=1, y=0, z=0}
-			tdir = {x=-1, y=0, z=0}
-			tpos = {x=pos.x+1, y=pos.y-1, z=pos.z+3}
-		elseif rotation == "270" then
-			dir = {x=0, y=0, z=1}
-			tdir = {x=0, y=0, z=1}
-			tpos = {x=pos.x+3, y=pos.y-1, z=pos.z+7}
-		else
-			return success
-		end
-		local function set_brick(pos)
-			local c = pr:next(1, 3) -- cracked chance
-			local m = pr:next(1, 10) -- chance for monster egg
-			local brick
-			if m == 1 then
-				if c == 1 then
-					brick = "mcl_monster_eggs:monster_egg_stonebrickcracked"
-				else
-					brick = "mcl_monster_eggs:monster_egg_stonebrick"
 				end
 			else
-				if c == 1 then
+				minetest.swap_node({x = x0 + x, y = y0, z = z0 + z}, {name = "mcl_portals:portal_end"})
-					brick = "mcl_core:stonebrickcracked"
-				else
-					brick = "mcl_core:stonebrick"
 			end
 		end
-			minetest.set_node(pos, {name=brick})
 	end
-		local ladder_param2 = minetest.dir_to_wallmounted(tdir)
-		local real_depth = 0
-		-- Check how deep we can actuall dig
-		for y=1, depth-5 do
-			real_depth = real_depth + 1
-			local node = minetest.get_node({x=tpos.x,y=tpos.y-y,z=tpos.z})
-			local def = minetest.registered_nodes[node.name]
-			if (not def) or (not def.walkable) or (def.liquidtype ~= "none") or (not def.is_ground_content) then
-				bpos.y = tpos.y-y+1
-				break
-			end
-		end
-		if real_depth <= 6 then
-			return success
-		end
-		-- Generate ladder to basement
-		for y=1, real_depth-1 do
-			set_brick({x=tpos.x-1,y=tpos.y-y,z=tpos.z  })
-			set_brick({x=tpos.x+1,y=tpos.y-y,z=tpos.z  })
-			set_brick({x=tpos.x  ,y=tpos.y-y,z=tpos.z-1})
-			set_brick({x=tpos.x  ,y=tpos.y-y,z=tpos.z+1})
-			minetest.set_node({x=tpos.x,y=tpos.y-y,z=tpos.z}, {name="mcl_core:ladder", param2=ladder_param2})
-		end
-		-- Place basement
-		mcl_structures.generate_igloo_basement(bpos, rotation, pr)
-		-- Place hidden trapdoor
-		minetest.after(5, function(tpos, dir)
-			minetest.set_node(tpos, {name="mcl_doors:trapdoor", param2=20+minetest.dir_to_facedir(dir)}) -- TODO: more reliable param2
-		end, tpos, dir)
-	end
-	return success
-end
-
-function mcl_structures.generate_igloo_top(pos, pr)
-	-- FIXME: This spawns bookshelf instead of furnace. Fix this!
-	-- Furnace does ot work atm because apparently meta is not set. :-(
-	local newpos = {x=pos.x,y=pos.y-1,z=pos.z}
-	local path = modpath.."/schematics/mcl_structures_igloo_top.mts"
-	local rotation = tostring(pr:next(0,3)*90)
-	return mcl_structures.place_schematic(newpos, path, rotation, nil, true), rotation
-end
-
-local function igloo_placement_callback(p1, p2, size, orientation, pr)
-	local chest_offset
-	if orientation == "0" then
-		chest_offset = {x=5, y=1, z=5}
-	elseif orientation == "90" then
-		chest_offset = {x=5, y=1, z=3}
-	elseif orientation == "180" then
-		chest_offset = {x=3, y=1, z=1}
-	elseif orientation == "270" then
-		chest_offset = {x=1, y=1, z=5}
-	else
-		return
-	end
-	--local size = {x=9,y=5,z=7}
-	local lootitems = mcl_loot.get_multi_loot({
-	{
-		stacks_min = 1,
-		stacks_max = 1,
-		items = {
-			{ itemstring = "mcl_core:apple_gold", weight = 1 },
-		}
-	},
-	{
-		stacks_min = 2,
-		stacks_max = 8,
-		items = {
-			{ itemstring = "mcl_core:coal_lump", weight = 15, amount_min = 1, amount_max = 4 },
-			{ itemstring = "mcl_core:apple", weight = 15, amount_min = 1, amount_max = 3 },
-			{ itemstring = "mcl_farming:wheat_item", weight = 10, amount_min = 2, amount_max = 3 },
-			{ itemstring = "mcl_core:gold_nugget", weight = 10, amount_min = 1, amount_max = 3 },
-			{ itemstring = "mcl_mobitems:rotten_flesh", weight = 10 },
-			{ itemstring = "mcl_tools:axe_stone", weight = 2 },
-			{ itemstring = "mcl_core:emerald", weight = 1 },
-		}
-	}}, pr)
-
-	local chest_pos = vector.add(p1, chest_offset)
-	init_node_construct(chest_pos)
-	local meta = minetest.get_meta(chest_pos)
-	local inv = meta:get_inventory()
-	mcl_loot.fill_inventory(inv, "main", lootitems, pr)
-end
-
-function mcl_structures.generate_igloo_basement(pos, orientation, pr)
-	-- TODO: Add brewing stand
-	-- TODO: Add monster eggs
-	-- TODO: Spawn villager and zombie villager
-	local path = modpath.."/schematics/mcl_structures_igloo_basement.mts"
-	mcl_structures.place_schematic(pos, path, orientation, nil, true, nil, igloo_placement_callback, pr)
 end
 
 function mcl_structures.generate_boulder(pos, rotation, pr)
@@ -284,7 +389,7 @@ local function hut_placement_callback(p1, p2, size, orientation, pr)
 	if not p1 or not p2 then return end
 	local legs = minetest.find_nodes_in_area(p1, p2, "mcl_core:tree")
 	for i = 1, #legs do
-		while minetest.get_item_group(mcl_vars.get_node({x=legs[i].x, y=legs[i].y-1, z=legs[i].z}, true, 333333).name, "water") ~= 0 do
+		while minetest.get_item_group(mcl_mapgen.get_far_node({x=legs[i].x, y=legs[i].y-1, z=legs[i].z}, true, 333333).name, "water") ~= 0 do
 			legs[i].y = legs[i].y - 1
 			minetest.swap_node(legs[i], {name = "mcl_core:tree", param2 = 2})
 		end
@@ -296,37 +401,14 @@ function mcl_structures.generate_witch_hut(pos, rotation, pr)
 	mcl_structures.place_schematic(pos, path, rotation, nil, true, nil, hut_placement_callback, pr)
 end
 
-function mcl_structures.generate_ice_spike_small(pos, rotation)
-	local path = modpath.."/schematics/mcl_structures_ice_spike_small.mts"
-	return minetest.place_schematic(pos, path, rotation or "random", nil, false) -- don't serialize schematics for registered biome decorations, for MT 5.4.0
-end
-
 function mcl_structures.generate_ice_spike_large(pos, rotation)
 	local path = modpath.."/schematics/mcl_structures_ice_spike_large.mts"
 	return minetest.place_schematic(pos, path, rotation or "random", nil, false) -- don't serialize schematics for registered biome decorations, for MT 5.4.0
 end
 
-function mcl_structures.generate_fossil(pos, rotation, pr)
+function mcl_structures.generate_end_exit_portal(pos, rot, pr, callback)
-	-- Generates one out of 8 possible fossil pieces
-	local newpos = {x=pos.x,y=pos.y-1,z=pos.z}
-	local fossils = {
-		"mcl_structures_fossil_skull_1.mts", -- 4×5×5
-		"mcl_structures_fossil_skull_2.mts", -- 5×5×5
-		"mcl_structures_fossil_skull_3.mts", -- 5×5×7
-		"mcl_structures_fossil_skull_4.mts", -- 7×5×5
-		"mcl_structures_fossil_spine_1.mts", -- 3×3×13
-		"mcl_structures_fossil_spine_2.mts", -- 5×4×13
-		"mcl_structures_fossil_spine_3.mts", -- 7×4×13
-		"mcl_structures_fossil_spine_4.mts", -- 8×5×13
-	}
-	local r = pr:next(1, #fossils)
-	local path = modpath.."/schematics/"..fossils[r]
-	return mcl_structures.place_schematic(newpos, path, rotation or "random", nil, true)
-end
-
-function mcl_structures.generate_end_exit_portal(pos, rot)
 	local path = modpath.."/schematics/mcl_structures_end_exit_portal.mts"
-	return mcl_structures.place_schematic(pos, path, rot or "0", {["mcl_portals:portal_end"] = "air"}, true)
+	return mcl_structures.place_schematic(pos, path, rot or "0", {["mcl_portals:portal_end"] = "air"}, true, nil, callback)
 end
 
 function mcl_structures.generate_end_exit_portal_open(pos, rot)
@@ -339,275 +421,15 @@ function mcl_structures.generate_end_gateway_portal(pos, rot)
 	return mcl_structures.place_schematic(pos, path, rot or "0", nil, true)
 end
 
-local function shrine_placement_callback(p1, p2, size, rotation, pr)
+local chunk_square = mcl_mapgen.CS_NODES * mcl_mapgen.CS_NODES
-	-- Find and setup spawner with silverfish
+local block_square = mcl_mapgen.BS * mcl_mapgen.BS
-	local spawners = minetest.find_nodes_in_area(p1, p2, "mcl_mobspawners:spawner")
-	for s=1, #spawners do
-		--local meta = minetest.get_meta(spawners[s])
-		mcl_mobspawners.setup_spawner(spawners[s], "mobs_mc:silverfish")
-	end
 
-	-- Shuffle stone brick types
+function mcl_structures.from_16x16_to_chunk_inverted_chance(x)
-	local bricks = minetest.find_nodes_in_area(p1, p2, "mcl_core:stonebrick")
+	return math.floor(x * 256 / chunk_square + 0.5)
-	for b=1, #bricks do
-		local r_bricktype = pr:next(1, 100)
-		local r_infested = pr:next(1, 100)
-		local bricktype
-		if r_infested <= 5 then
-			if r_bricktype <= 30 then -- 30%
-				bricktype = "mcl_monster_eggs:monster_egg_stonebrickmossy"
-			elseif r_bricktype <= 50 then -- 20%
-				bricktype = "mcl_monster_eggs:monster_egg_stonebrickcracked"
-			else -- 50%
-				bricktype = "mcl_monster_eggs:monster_egg_stonebrick"
-			end
-		else
-			if r_bricktype <= 30 then -- 30%
-				bricktype = "mcl_core:stonebrickmossy"
-			elseif r_bricktype <= 50 then -- 20%
-				bricktype = "mcl_core:stonebrickcracked"
-			end
-			-- 50% stonebrick (no change necessary)
-		end
-		if bricktype then
-			minetest.set_node(bricks[b], { name = bricktype })
-		end
-	end
-
-	-- Also replace stairs
-	local stairs = minetest.find_nodes_in_area(p1, p2, {"mcl_stairs:stair_stonebrick", "mcl_stairs:stair_stonebrick_outer", "mcl_stairs:stair_stonebrick_inner"})
-	for s=1, #stairs do
-		local stair = minetest.get_node(stairs[s])
-		local r_type = pr:next(1, 100)
-		if r_type <= 30 then -- 30% mossy
-			if stair.name == "mcl_stairs:stair_stonebrick" then
-				stair.name = "mcl_stairs:stair_stonebrickmossy"
-			elseif stair.name == "mcl_stairs:stair_stonebrick_outer" then
-				stair.name = "mcl_stairs:stair_stonebrickmossy_outer"
-			elseif stair.name == "mcl_stairs:stair_stonebrick_inner" then
-				stair.name = "mcl_stairs:stair_stonebrickmossy_inner"
-			end
-			minetest.set_node(stairs[s], stair)
-		elseif r_type <= 50 then -- 20% cracky
-			if stair.name == "mcl_stairs:stair_stonebrick" then
-				stair.name = "mcl_stairs:stair_stonebrickcracked"
-			elseif stair.name == "mcl_stairs:stair_stonebrick_outer" then
-				stair.name = "mcl_stairs:stair_stonebrickcracked_outer"
-			elseif stair.name == "mcl_stairs:stair_stonebrick_inner" then
-				stair.name = "mcl_stairs:stair_stonebrickcracked_inner"
-			end
-			minetest.set_node(stairs[s], stair)
-		end
-		-- 50% no change
-	end
-
-	-- Randomly add ender eyes into end portal frames, but never fill the entire frame
-	local frames = minetest.find_nodes_in_area(p1, p2, "mcl_portals:end_portal_frame")
-	local eyes = 0
-	for f=1, #frames do
-		local r_eye = pr:next(1, 10)
-		if r_eye == 1 then
-			eyes = eyes + 1
-			if eyes < #frames then
-				local frame_node = minetest.get_node(frames[f])
-				frame_node.name = "mcl_portals:end_portal_frame_eye"
-				minetest.set_node(frames[f], frame_node)
-			end
-		end
-	end
 end
 
-function mcl_structures.generate_end_portal_shrine(pos, rotation, pr)
+function mcl_structures.from_16x16_to_block_inverted_chance(x)
-	local offset = {x=6, y=4, z=6}
+	return math.floor(x * 256 / block_square + 0.5)
-	--local size = {x=13, y=8, z=13}
-	local newpos = { x = pos.x - offset.x, y = pos.y, z = pos.z - offset.z }
-
-	local path = modpath.."/schematics/mcl_structures_end_portal_room_simple.mts"
-	mcl_structures.place_schematic(newpos, path, rotation or "0", nil, true, nil, shrine_placement_callback, pr)
 end
 
-local function temple_placement_callback(p1, p2, size, rotation, pr)
+dofile(modpath .. "/structures.lua")
-
-	-- Delete cacti leftovers:
-	local cactus_nodes = minetest.find_nodes_in_area_under_air(p1, p2, "mcl_core:cactus")
-	if cactus_nodes and #cactus_nodes > 0 then
-		for _, pos in pairs(cactus_nodes) do
-			local node_below = minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z})
-			if node_below and node_below.name == "mcl_core:sandstone" then
-				minetest.swap_node(pos, {name="air"})
-			end
-		end
-	end
-
-	-- Find chests.
-	-- FIXME: Searching this large area just for the chets is not efficient. Need a better way to find the chests;
-	-- probably let's just infer it from newpos because the schematic always the same.
-	local chests = minetest.find_nodes_in_area(p1, p2, "mcl_chests:chest")
-
-	-- Add desert temple loot into chests
-	for c=1, #chests do
-		local lootitems = mcl_loot.get_multi_loot({
-		{
-			stacks_min = 2,
-			stacks_max = 4,
-			items = {
-				{ itemstring = "mcl_mobitems:bone", weight = 25, amount_min = 4, amount_max=6 },
-				{ itemstring = "mcl_mobitems:rotten_flesh", weight = 25, amount_min = 3, amount_max=7 },
-				{ itemstring = "mcl_mobitems:spider_eye", weight = 25, amount_min = 1, amount_max=3 },
-				{ itemstring = "mcl_books:book", weight = 20, func = function(stack, pr)
-					mcl_enchanting.enchant_uniform_randomly(stack, {"soul_speed"}, pr)
-				end },
-				{ itemstring = "mcl_mobitems:saddle", weight = 20, },
-				{ itemstring = "mcl_core:apple_gold", weight = 20, },
-				{ itemstring = "mcl_core:gold_ingot", weight = 15, amount_min = 2, amount_max = 7 },
-				{ itemstring = "mcl_core:iron_ingot", weight = 15, amount_min = 1, amount_max = 5 },
-				{ itemstring = "mcl_core:emerald", weight = 15, amount_min = 1, amount_max = 3 },
-				{ itemstring = "", weight = 15, },
-				{ itemstring = "mobs_mc:iron_horse_armor", weight = 15, },
-				{ itemstring = "mobs_mc:gold_horse_armor", weight = 10, },
-				{ itemstring = "mobs_mc:diamond_horse_armor", weight = 5, },
-				{ itemstring = "mcl_core:diamond", weight = 5, amount_min = 1, amount_max = 3 },
-				{ itemstring = "mcl_core:apple_gold_enchanted", weight = 2, },
-			}
-		},
-		{
-			stacks_min = 4,
-			stacks_max = 4,
-			items = {
-				{ itemstring = "mcl_mobitems:bone", weight = 10, amount_min = 1, amount_max = 8 },
-				{ itemstring = "mcl_mobitems:rotten_flesh", weight = 10, amount_min = 1, amount_max = 8 },
-				{ itemstring = "mcl_mobitems:gunpowder", weight = 10, amount_min = 1, amount_max = 8 },
-				{ itemstring = "mcl_core:sand", weight = 10, amount_min = 1, amount_max = 8 },
-				{ itemstring = "mcl_mobitems:string", weight = 10, amount_min = 1, amount_max = 8 },
-			}
-		}}, pr)
-		init_node_construct(chests[c])
-		local meta = minetest.get_meta(chests[c])
-		local inv = meta:get_inventory()
-		mcl_loot.fill_inventory(inv, "main", lootitems, pr)
-	end
-
-	-- Initialize pressure plates and randomly remove up to 5 plates
-	local pplates = minetest.find_nodes_in_area(p1, p2, "mesecons_pressureplates:pressure_plate_stone_off")
-	local pplates_remove = 5
-	for p=1, #pplates do
-		if pplates_remove > 0 and pr:next(1, 100) >= 50 then
-			-- Remove plate
-			minetest.remove_node(pplates[p])
-			pplates_remove = pplates_remove - 1
-		else
-			-- Initialize plate
-			minetest.registered_nodes["mesecons_pressureplates:pressure_plate_stone_off"].on_construct(pplates[p])
-		end
-	end
-end
-
-function mcl_structures.generate_desert_temple(pos, rotation, pr)
-	-- No Generating for the temple ... Why using it ? No Change
-	local path = modpath.."/schematics/mcl_structures_desert_temple.mts"
-	local newpos = {x=pos.x,y=pos.y-12,z=pos.z}
-	--local size = {x=22, y=24, z=22}
-	if newpos == nil then
-		return
-	end
-	mcl_structures.place_schematic(newpos, path, rotation or "random", nil, true, nil, temple_placement_callback, pr)
-end
-
-local registered_structures = {}
-
---[[ Returns a table of structure of the specified type.
-Currently the only valid parameter is "stronghold".
-Format of return value:
-{
-	{ pos = <position>, generated=<true/false> }, -- first structure
-	{ pos = <position>, generated=<true/false> }, -- second structure
-	-- and so on
-}
-
-TODO: Implement this function for all other structure types as well.
-]]
-function mcl_structures.get_registered_structures(structure_type)
-	if registered_structures[structure_type] then
-		return table.copy(registered_structures[structure_type])
-	else
-		return {}
-	end
-end
-
--- Register a structures table for the given type. The table format is the same as for
--- mcl_structures.get_registered_structures.
-function mcl_structures.register_structures(structure_type, structures)
-	registered_structures[structure_type] = structures
-end
-
-local function dir_to_rotation(dir)
-	local ax, az = math.abs(dir.x), math.abs(dir.z)
-	if ax > az then
-		if dir.x < 0 then
-			return "270"
-		end
-		return "90"
-	end
-	if dir.z < 0 then
-		return "180"
-	end
-	return "0"
-end
-
--- Debug command
-minetest.register_chatcommand("spawnstruct", {
-	params = "desert_temple | desert_well | igloo | witch_hut | boulder | ice_spike_small | ice_spike_large | fossil | end_exit_portal | end_exit_portal_open | end_gateway_portal | end_portal_shrine | nether_portal | dungeon",
-	description = S("Generate a pre-defined structure near your position."),
-	privs = {debug = true},
-	func = function(name, param)
-		local player = minetest.get_player_by_name(name)
-		if not player then return end
-		local pos = player:get_pos()
-		if not pos then return end
-		pos = vector.round(pos)
-		local dir = minetest.yaw_to_dir(player:get_look_horizontal())
-		local rot = dir_to_rotation(dir)
-		local pr = PseudoRandom(pos.x+pos.y+pos.z)
-		local errord = false
-		local message = S("Structure placed.")
-		if param == "desert_temple" then
-			mcl_structures.generate_desert_temple(pos, rot, pr)
-		elseif param == "desert_well" then
-			mcl_structures.generate_desert_well(pos, rot)
-		elseif param == "igloo" then
-			mcl_structures.generate_igloo(pos, rot, pr)
-		elseif param == "witch_hut" then
-			mcl_structures.generate_witch_hut(pos, rot, pr)
-		elseif param == "boulder" then
-			mcl_structures.generate_boulder(pos, rot, pr)
-		elseif param == "fossil" then
-			mcl_structures.generate_fossil(pos, rot, pr)
-		elseif param == "ice_spike_small" then
-			mcl_structures.generate_ice_spike_small(pos, rot, pr)
-		elseif param == "ice_spike_large" then
-			mcl_structures.generate_ice_spike_large(pos, rot, pr)
-		elseif param == "end_exit_portal" then
-			mcl_structures.generate_end_exit_portal(pos, rot, pr)
-		elseif param == "end_exit_portal_open" then
-			mcl_structures.generate_end_exit_portal_open(pos, rot, pr)
-		elseif param == "end_gateway_portal" then
-			mcl_structures.generate_end_gateway_portal(pos, rot, pr)
-		elseif param == "end_portal_shrine" then
-			mcl_structures.generate_end_portal_shrine(pos, rot, pr)
-		elseif param == "dungeon" and mcl_dungeons and mcl_dungeons.spawn_dungeon then
-			mcl_dungeons.spawn_dungeon(pos, rot, pr)
-		elseif param == "nether_portal" and mcl_portals and mcl_portals.spawn_nether_portal then
-			mcl_portals.spawn_nether_portal(pos, rot, pr, name)
-		elseif param == "" then
-			message = S("Error: No structure type given. Please use “/spawnstruct <type>”.")
-			errord = true
-		else
-			message = S("Error: Unknown structure type. Please use “/spawnstruct <type>”.")
-			errord = true
-		end
-		minetest.chat_send_player(name, message)
-		if errord then
-			minetest.chat_send_player(name, S("Use /help spawnstruct to see a list of avaiable types."))
-		end
-	end
-})

mods/MAPGEN/mcl_structures/jungle_temple.lua

@@ -0,0 +1,203 @@
+local modname = minetest.get_current_modname()
+local modpath = minetest.get_modpath(modname)
+
+local chance_per_chunk = 9
+local noise_multiplier = 1.3
+local random_offset    = 132
+local struct_threshold = chance_per_chunk - 1
+local scanning_ratio   = 0.0003
+
+local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level
+
+local node_list = {"mcl_core:dirt_with_grass", "mcl_core:dirt", "mcl_core:stone", "mcl_core:granite", "mcl_core:gravel", "mcl_core:diorite"}
+
+local schematic_file = modpath .. "/schematics/mcl_structures_jungle_temple.mts"
+
+local temple_schematic_lua = minetest.serialize_schematic(schematic_file, "lua", {lua_use_comments = false, lua_num_indent_spaces = 0}) .. " return schematic"
+local temple_schematic = loadstring(temple_schematic_lua)()
+local size = temple_schematic.size
+local sx = size.x
+local sy = size.y
+local sz = size.z
+local offset = vector.round(vector.divide(size, 2))
+offset.y = 5
+
+local ox = offset.x
+local oy = offset.y
+local oz = offset.z
+local corner_x = sx - 3
+local corner_z = sz - 3
+local air_offset_x = ox - 6
+local air_offset_z = oz - 6
+
+local function is_air(pos)
+	local node = minetest.get_node(pos)
+	return node.name == "air"
+end
+
+local stair_support_node = {
+	{name = "mcl_core:cobble"},
+	{name = "mcl_core:mossycobble"},
+	{name = "mcl_core:stonebrick"},
+	{name = "mcl_core:stonebrickmossy"},
+	{name = "mcl_core:stonebrickcracked"},
+}
+
+local function on_placed(p1, rotation, pr, size)
+	local p2
+	if rotation == "90" or rotation == "270" then
+		p2 = {x = p1.x + sz - 1, y = p1.y + sy - 1, z = p1.z + sx - 1}
+	else
+		p2 = {x = p1.x + sx - 1, y = p1.y + sy - 1, z = p1.z + sz - 1}
+	end
+
+	-- Support stairs
+	local y = p1.y + 5
+	local bottom = mcl_mapgen.get_chunk_beginning(y)
+	local stair_list = minetest.find_nodes_in_area({x = p1.x, y = y, z = p1.z}, {x = p2.x, y = y, z = p2.z}, {"mcl_stairs:stair_cobble"}, false)
+	for i = 1, #stair_list do
+		local pos = stair_list[i]
+		pos.y = y - 1
+		while is_air(pos) and pos.y > bottom  do
+			minetest.swap_node(pos, stair_support_node[pr:next(1, #stair_support_node)])
+			pos.y = pos.y - 1
+		end
+	end
+
+	-- Initialize some nodes
+	local chest_node = "mcl_chests:trapped_chest_small"
+	local lever_node = "mesecons_walllever:wall_lever_off"
+	local nodes = minetest.find_nodes_in_area(p1, {x = p2.x, y = p1.y + 5, z = p2.z}, {chest_node, lever_node}, true)
+
+	local levers = nodes[lever_node]
+	for _, pos in pairs(levers) do
+		mcl_structures.init_node_construct(pos)
+	end
+
+	-- Add loot into chests TODO: fix items
+	local chests = nodes[chest_node]
+	for c=1, #chests do
+		local lootitems = mcl_loot.get_multi_loot({
+		{
+			stacks_min = 2,
+			stacks_max = 4,
+			items = {
+				{ itemstring = "mcl_mobitems:bone", weight = 25, amount_min = 4, amount_max=6 },
+				{ itemstring = "mcl_mobitems:rotten_flesh", weight = 25, amount_min = 3, amount_max=7 },
+				{ itemstring = "mcl_mobitems:spider_eye", weight = 25, amount_min = 1, amount_max=3 },
+				{ itemstring = "mcl_books:book", weight = 20, func = function(stack, pr)
+					mcl_enchanting.enchant_uniform_randomly(stack, {"soul_speed"}, pr)
+				end },
+				{ itemstring = "mcl_mobitems:saddle", weight = 20, },
+				{ itemstring = "mcl_core:apple_gold", weight = 20, },
+				{ itemstring = "mcl_core:gold_ingot", weight = 15, amount_min = 2, amount_max = 7 },
+				{ itemstring = "mcl_core:iron_ingot", weight = 15, amount_min = 1, amount_max = 5 },
+				{ itemstring = "mcl_core:emerald", weight = 15, amount_min = 1, amount_max = 3 },
+				{ itemstring = "", weight = 15, },
+				{ itemstring = "mobs_mc:iron_horse_armor", weight = 15, },
+				{ itemstring = "mobs_mc:gold_horse_armor", weight = 10, },
+				{ itemstring = "mobs_mc:diamond_horse_armor", weight = 5, },
+				{ itemstring = "mcl_core:diamond", weight = 5, amount_min = 1, amount_max = 3 },
+				{ itemstring = "mcl_core:apple_gold_enchanted", weight = 2, },
+			}
+		},
+		{
+			stacks_min = 4,
+			stacks_max = 4,
+			items = {
+				{ itemstring = "mcl_mobitems:bone", weight = 10, amount_min = 1, amount_max = 8 },
+				{ itemstring = "mcl_mobitems:rotten_flesh", weight = 10, amount_min = 1, amount_max = 8 },
+				{ itemstring = "mcl_mobitems:gunpowder", weight = 10, amount_min = 1, amount_max = 8 },
+				{ itemstring = "mcl_core:sand", weight = 10, amount_min = 1, amount_max = 8 },
+				{ itemstring = "mcl_mobitems:string", weight = 10, amount_min = 1, amount_max = 8 },
+			}
+		}}, pr)
+		mcl_structures.init_node_construct(chests[c])
+		local meta = minetest.get_meta(chests[c])
+		local inv = meta:get_inventory()
+		mcl_loot.fill_inventory(inv, "main", lootitems, pr)
+	end
+end
+
+local function place(pos, rotation, pr)
+	mcl_structures.place_schematic({pos = pos, schematic = temple_schematic, pr = pr, on_placed = on_placed})
+end
+
+local mcl_mapgen_clamp_to_chunk = mcl_mapgen.clamp_to_chunk
+local function process_pos(pos)
+	return {
+		x = mcl_mapgen_clamp_to_chunk(pos.x - ox, sx),
+		y = mcl_mapgen_clamp_to_chunk(pos.y - oy, sy),
+		z = mcl_mapgen_clamp_to_chunk(pos.z - oz, sz),
+	}
+end
+
+local function get_place_rank(pos)
+	local x1 = pos.x + 1
+	local x2 = x1 + corner_x
+	local z1 = pos.z + 1
+	local z2 = z1 + corner_z
+	local y2 = pos.y + 1
+	local y1 = y2 - 2
+	if is_air({x = x1, y = y1, z = z1}) then return -1 end
+	if is_air({x = x2, y = y1, z = z1}) then return -1 end
+	if is_air({x = x1, y = y1, z = z2}) then return -1 end
+	if is_air({x = x2, y = y1, z = z2}) then return -1 end
+
+	local p1 = {x = x1 + air_offset_x, y = y2, z = z1 + air_offset_z}
+	local p2 = {x = x2 - air_offset_x, y = y2, z = z2 + air_offset_z}
+	local pos_counter_air = #minetest.find_nodes_in_area(p1, p2, {"air", "group:buildable_to", "group:deco_block"}, false)
+	local pos_counter_air = pos_counter_air - 2 * (#minetest.find_nodes_in_area(p1, p2, {"group:tree"}, false))
+
+	local p1 = {x = x1 + 1, y = y1, z = z1 + 1}
+	local p2 = {x = x2 - 1, y = y1, z = z2 - 1}
+	local pos_counter_ground = #minetest.find_nodes_in_area(p1, p2, node_list, false)
+	return pos_counter_ground + pos_counter_air
+end
+
+mcl_structures.register_structure({
+	name = "jungle_temple",
+	decoration = {
+		deco_type = "simple",
+		place_on = node_list,
+		flags = "all_floors",
+		fill_ratio = scanning_ratio,
+		y_min = -13,
+		y_max = mcl_mapgen.overworld.max,
+		height = 1,
+		biomes =
+			mcl_mapgen.v6 and {
+				"Jungle"
+			} or {
+				"Jungle",
+				"JungleEdge",
+				"JungleEdgeM",
+				"JungleEdgeM_ocean",
+				"JungleEdge_ocean",
+				"JungleM",
+				"JungleM_ocean",
+				"JungleM_shore",
+				"Jungle_ocean",
+				"Jungle_shore",
+		},
+	},
+	on_finished_chunk = function(minp, maxp, seed, vm_context, pos_list)
+		local pr = PseudoRandom(seed + random_offset)
+		local random_number = pr:next(1, chance_per_chunk)
+		local noise = mcl_structures_get_perlin_noise_level(minp) * noise_multiplier
+		if (random_number + noise) < struct_threshold then return end
+		local pos
+		local count = -1
+		for i = 1, #pos_list do
+			local pos_i = process_pos(pos_list[i])
+			local count_i = get_place_rank(pos_i)
+			if count_i > count then
+				count = count_i
+				pos = pos_i
+			end
+		end
+		if count < 0 then return end
+		place(pos, nil, pr)
+	end,
+	place_function = place,
+})

mods/MAPGEN/mcl_structures/mod.conf

@@ -1,4 +1,4 @@
 name = mcl_structures
-author = Wuzzy
+author = Wuzzy, kay27, cora
-description = Structures for MCL2
+description = Structures for MineClone 2/5
-depends = mcl_loot
+depends = mcl_loot, mcl_mapgen, mcl_worlds

mods/MAPGEN/mcl_structures/nice_jungle_temple.lua

@@ -0,0 +1,209 @@
+local modname = minetest.get_current_modname()
+local modpath = minetest.get_modpath(modname)
+
+local chance_per_chunk = 15
+local noise_multiplier = 1
+local random_offset    = 133
+local struct_threshold = chance_per_chunk - 1
+local scanning_ratio   = 0.00021
+local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level
+
+local node_list = {"mcl_core:dirt_with_grass", "mcl_core:dirt", "mcl_core:stone", "mcl_core:granite", "mcl_core:gravel", "mcl_core:diorite"}
+
+local schematic_file = modpath .. "/schematics/mcl_structures_nice_jungle_temple.mts"
+
+local temple_schematic_lua = minetest.serialize_schematic(schematic_file, "lua", {lua_use_comments = false, lua_num_indent_spaces = 0}) .. " return schematic"
+local temple_schematic = loadstring(temple_schematic_lua)()
+local size = temple_schematic.size
+local sx = size.x
+local sy = size.y
+local sz = size.z
+local offset = vector.round(vector.divide(size, 2))
+offset.y = 5
+
+local ox = offset.x
+local oy = offset.y
+local oz = offset.z
+local corner_x = sx - 3
+local corner_z = sz - 3
+local air_offset_x = ox - 6
+local air_offset_z = oz - 6
+
+local function is_air(pos)
+	local node = minetest.get_node(pos)
+	return node.name == "air"
+end
+
+local stair_support_node = {
+	{name = "mcl_core:cobble"},
+	{name = "mcl_core:mossycobble"},
+	{name = "mcl_core:stonebrick"},
+	{name = "mcl_core:stonebrickmossy"},
+	{name = "mcl_core:stonebrickcracked"},
+}
+
+local nodes_to_be_supported = {
+	"mcl_stairs:stair_cobble",
+	"mcl_stairs:stair_stonebrickmossy",
+	"mcl_stairs:stair_stonebrickcracked",
+}
+
+local function on_placed(p1, rotation, pr, size)
+	local p2
+	if rotation == "90" or rotation == "270" then
+		p2 = {x = p1.x + sz - 1, y = p1.y + sy - 1, z = p1.z + sx - 1}
+	else
+		p2 = {x = p1.x + sx - 1, y = p1.y + sy - 1, z = p1.z + sz - 1}
+	end
+
+	-- Support stairs
+	local y = p1.y + 5
+	local bottom = mcl_mapgen.get_chunk_beginning(y)
+	local stair_list = minetest.find_nodes_in_area({x = p1.x, y = y, z = p1.z}, {x = p2.x, y = y, z = p2.z}, nodes_to_be_supported, false)
+	for i = 1, #stair_list do
+		local pos = stair_list[i]
+		pos.y = y - 1
+		while is_air(pos) and pos.y > bottom  do
+			minetest.swap_node(pos, stair_support_node[pr:next(1, #stair_support_node)])
+			pos.y = pos.y - 1
+		end
+	end
+
+	-- Initialize some nodes
+	local chest_node = "mcl_chests:trapped_chest_small"
+	local lever_node = "mesecons_walllever:wall_lever_off"
+	local nodes = minetest.find_nodes_in_area(p1, {x = p2.x, y = p1.y + 5, z = p2.z}, {chest_node, lever_node}, true)
+
+	local levers = nodes[lever_node]
+	for _, pos in pairs(levers) do
+		mcl_structures.init_node_construct(pos)
+	end
+
+	-- Add loot into chests TODO: fix items
+	local chests = nodes[chest_node]
+	for c=1, #chests do
+		local lootitems = mcl_loot.get_multi_loot({
+		{
+			stacks_min = 2,
+			stacks_max = 4,
+			items = {
+				{ itemstring = "mcl_mobitems:bone", weight = 25, amount_min = 4, amount_max=6 },
+				{ itemstring = "mcl_mobitems:rotten_flesh", weight = 25, amount_min = 3, amount_max=7 },
+				{ itemstring = "mcl_mobitems:spider_eye", weight = 25, amount_min = 1, amount_max=3 },
+				{ itemstring = "mcl_books:book", weight = 20, func = function(stack, pr)
+					mcl_enchanting.enchant_uniform_randomly(stack, {"soul_speed"}, pr)
+				end },
+				{ itemstring = "mcl_mobitems:saddle", weight = 20, },
+				{ itemstring = "mcl_core:apple_gold", weight = 20, },
+				{ itemstring = "mcl_core:gold_ingot", weight = 15, amount_min = 2, amount_max = 7 },
+				{ itemstring = "mcl_core:iron_ingot", weight = 15, amount_min = 1, amount_max = 5 },
+				{ itemstring = "mcl_core:emerald", weight = 15, amount_min = 1, amount_max = 3 },
+				{ itemstring = "", weight = 15, },
+				{ itemstring = "mobs_mc:iron_horse_armor", weight = 15, },
+				{ itemstring = "mobs_mc:gold_horse_armor", weight = 10, },
+				{ itemstring = "mobs_mc:diamond_horse_armor", weight = 5, },
+				{ itemstring = "mcl_core:diamond", weight = 5, amount_min = 1, amount_max = 3 },
+				{ itemstring = "mcl_core:apple_gold_enchanted", weight = 2, },
+			}
+		},
+		{
+			stacks_min = 4,
+			stacks_max = 4,
+			items = {
+				{ itemstring = "mcl_mobitems:bone", weight = 10, amount_min = 1, amount_max = 8 },
+				{ itemstring = "mcl_mobitems:rotten_flesh", weight = 10, amount_min = 1, amount_max = 8 },
+				{ itemstring = "mcl_mobitems:gunpowder", weight = 10, amount_min = 1, amount_max = 8 },
+				{ itemstring = "mcl_core:sand", weight = 10, amount_min = 1, amount_max = 8 },
+				{ itemstring = "mcl_mobitems:string", weight = 10, amount_min = 1, amount_max = 8 },
+			}
+		}}, pr)
+		mcl_structures.init_node_construct(chests[c])
+		local meta = minetest.get_meta(chests[c])
+		local inv = meta:get_inventory()
+		mcl_loot.fill_inventory(inv, "main", lootitems, pr)
+	end
+
+end
+
+local function place(pos, rotation, pr)
+	mcl_structures.place_schematic({pos = pos, schematic = temple_schematic, pr = pr, on_placed = on_placed})
+end
+
+local mcl_mapgen_clamp_to_chunk = mcl_mapgen.clamp_to_chunk
+local function process_pos(pos)
+	return {
+		x = mcl_mapgen_clamp_to_chunk(pos.x - ox, sx),
+		y = mcl_mapgen_clamp_to_chunk(pos.y - oy, sy),
+		z = mcl_mapgen_clamp_to_chunk(pos.z - oz, sz),
+	}
+end
+
+local function get_place_rank(pos)
+	local x1 = pos.x + 1
+	local x2 = x1 + corner_x
+	local z1 = pos.z + 1
+	local z2 = z1 + corner_z
+	local y2 = pos.y + 1
+	local y1 = y2 - 2
+	if is_air({x = x1, y = y1, z = z1}) then return -1 end
+	if is_air({x = x2, y = y1, z = z1}) then return -1 end
+	if is_air({x = x1, y = y1, z = z2}) then return -1 end
+	if is_air({x = x2, y = y1, z = z2}) then return -1 end
+
+	local p1 = {x = x1 + air_offset_x, y = y2, z = z1 + air_offset_z}
+	local p2 = {x = x2 - air_offset_x, y = y2, z = z2 + air_offset_z}
+	local pos_counter_air = #minetest.find_nodes_in_area(p1, p2, {"air", "group:buildable_to", "group:deco_block"}, false)
+	local pos_counter_air = pos_counter_air - 2 * (#minetest.find_nodes_in_area(p1, p2, {"group:tree"}, false))
+
+	local p1 = {x = x1 + 1, y = y1, z = z1 + 1}
+	local p2 = {x = x2 - 1, y = y1, z = z2 - 1}
+	local pos_counter_ground = #minetest.find_nodes_in_area(p1, p2, node_list, false)
+	return pos_counter_ground + pos_counter_air
+end
+
+mcl_structures.register_structure({
+	name = "nice_jungle_temple",
+	decoration = {
+		deco_type = "simple",
+		place_on = node_list,
+		flags = "all_floors",
+		fill_ratio = scanning_ratio,
+		y_min = -20,
+		y_max = mcl_mapgen.overworld.max,
+		height = 1,
+		biomes =
+			mcl_mapgen.v6 and {
+				"Jungle"
+			} or {
+				"Jungle",
+				"JungleEdge",
+				"JungleEdgeM",
+				"JungleEdgeM_ocean",
+				"JungleEdge_ocean",
+				"JungleM",
+				"JungleM_ocean",
+				"JungleM_shore",
+				"Jungle_ocean",
+				"Jungle_shore",
+		},
+	},
+	on_finished_chunk = function(minp, maxp, seed, vm_context, pos_list)
+		local pr = PseudoRandom(seed + random_offset)
+		local random_number = pr:next(1, chance_per_chunk)
+		local noise = mcl_structures_get_perlin_noise_level(minp) * noise_multiplier
+		if (random_number + noise) < struct_threshold then return end
+		local pos
+		local count = -1
+		for i = 1, #pos_list do
+			local pos_i = process_pos(pos_list[i])
+			local count_i = get_place_rank(pos_i)
+			if count_i > count then
+				count = count_i
+				pos = pos_i
+			end
+		end
+		if count < 0 then return end
+		place(pos, nil, pr)
+	end,
+	place_function = place,
+})

mods/MAPGEN/mcl_structures/noise_indicator.lua

@@ -0,0 +1,60 @@
+local step = 1
+local chunk_borders = false
+
+local levels = {
+	[-9] = "black",
+	[-8] = "brown",
+	[-7] = "brown",
+	[-6] = "gray",
+	[-5] = "gray",
+	[-4] = "red",
+	[-3] = "orange",
+	[-2] = "purple",
+	[-1] = "magenta",
+	[0] = "pink",
+	[1] = "yellow",
+	[2] = "green",
+	[3] = "lime",
+	[4] = "blue",
+	[5] = "cyan",
+	[6] = "light_blue",
+	[7] = "silver",
+	[8] = "silver",
+	[9] = "white",
+}
+
+local math_min, math_max = math.min, math.max
+local math_floor, math_ceil = math.floor, math.ceil
+
+local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level
+
+local noise_offset_x_and_z = math_floor(mcl_mapgen.CS_NODES/2)
+
+mcl_mapgen.register_mapgen(function(minp, maxp, seed, vm_context)
+	local y0 = minp.y
+	for x0 = minp.x, maxp.x, step do
+		for z0 = minp.z, maxp.z, step do
+			local current_noise_level = mcl_structures_get_perlin_noise_level({x = x0 - noise_offset_x_and_z, y = y0, z = z0 - noise_offset_x_and_z})
+			local amount
+			if current_noise_level < 0 then
+				amount = math_max(math_ceil(current_noise_level * 9), -9)
+			else
+				amount = math_min(math_floor(current_noise_level * 9), 9)
+			end
+			local y0 = maxp.y - 9 + amount
+			minetest.set_node({x=x0, y=y0, z=z0}, {name = "mcl_core:glass_"..levels[amount]})
+		end
+	end
+	if chunk_borders then
+		for x0 = minp.x, maxp.x, step do
+			for y0 = minp.y, maxp.y, step do
+				minetest.set_node({x=x0, y=y0, z=maxp.z}, {name = "mcl_core:glass"})
+			end
+		end
+		for z0 = minp.z, maxp.z, step do
+			for y0 = minp.y, maxp.y, step do
+				minetest.set_node({x=maxp.x, y=y0, z=z0}, {name = "mcl_core:glass"})
+			end
+		end
+	end
+end, -1)

mods/MAPGEN/mcl_structures/stronghold.lua

@@ -0,0 +1,184 @@
+-- Generate strongholds.
+
+local modname = minetest.get_current_modname()
+local modpath = minetest.get_modpath(modname)
+
+-- A total of 128 strongholds are generated in rings around the world origin.
+-- This is the list of rings, starting with the innermost ring first.
+local stronghold_rings = {
+	-- amount: Number of strongholds in ring.
+	-- min, max: Minimum and maximum distance from (X=0, Z=0).
+	{ amount = 3, min = 1408, max = 2688 },
+	{ amount = 6, min = 4480, max = 5760 },
+	{ amount = 10, min = 7552, max = 8832 },
+	{ amount = 15, min = 10624, max = 11904 },
+	{ amount = 21, min = 13696, max = 14976 },
+	{ amount = 28, min = 16768, max = 18048 },
+	{ amount = 36, min = 19840, max = 21120 },
+	{ amount = 9, min = 22912, max = 24192 },
+}
+
+local strongholds = {}
+local strongholds_inited = false
+
+local superflat = mcl_mapgen.superflat
+
+local size = {x = 13, y = 8, z = 13}
+local offset = vector.round(vector.divide(size, 2))
+
+local function place(pos, rotation, pr)
+	local p1 = { x = pos.x - offset.x, y = pos.y - offset.y, z = pos.z - offset.z }
+	local p2 = vector.add(p1, vector.subtract(size, 1))
+
+	local path = modpath.."/schematics/mcl_structures_end_portal_room_simple.mts"
+
+	mcl_structures.place_schematic({
+		pos       = p1,
+		schematic = path,
+		rotation  = rotation or "0",
+		pr        = pr,
+	})
+	-- Find and setup spawner with silverfish
+	local spawners = minetest.find_nodes_in_area(p1, p2, "mcl_mobspawners:spawner")
+	for s=1, #spawners do
+		mcl_mobspawners.setup_spawner(spawners[s], "mobs_mc:silverfish")
+	end
+
+	-- Shuffle stone brick types
+	local bricks = minetest.find_nodes_in_area(p1, p2, "mcl_core:stonebrick")
+	for b=1, #bricks do
+		local r_bricktype = pr:next(1, 100)
+		local r_infested = pr:next(1, 100)
+		local bricktype
+		if r_infested <= 5 then
+			if r_bricktype <= 30 then -- 30%
+				bricktype = "mcl_monster_eggs:monster_egg_stonebrickmossy"
+			elseif r_bricktype <= 50 then -- 20%
+				bricktype = "mcl_monster_eggs:monster_egg_stonebrickcracked"
+			else -- 50%
+				bricktype = "mcl_monster_eggs:monster_egg_stonebrick"
+			end
+		else
+			if r_bricktype <= 30 then -- 30%
+				bricktype = "mcl_core:stonebrickmossy"
+			elseif r_bricktype <= 50 then -- 20%
+				bricktype = "mcl_core:stonebrickcracked"
+			end
+			-- 50% stonebrick (no change necessary)
+		end
+		if bricktype then
+			minetest.set_node(bricks[b], { name = bricktype })
+		end
+	end
+
+	-- Also replace stairs
+	local stairs = minetest.find_nodes_in_area(p1, p2, {"mcl_stairs:stair_stonebrick", "mcl_stairs:stair_stonebrick_outer", "mcl_stairs:stair_stonebrick_inner"})
+	for s=1, #stairs do
+		local stair = minetest.get_node(stairs[s])
+		local r_type = pr:next(1, 100)
+		if r_type <= 30 then -- 30% mossy
+			if stair.name == "mcl_stairs:stair_stonebrick" then
+				stair.name = "mcl_stairs:stair_stonebrickmossy"
+			elseif stair.name == "mcl_stairs:stair_stonebrick_outer" then
+				stair.name = "mcl_stairs:stair_stonebrickmossy_outer"
+			elseif stair.name == "mcl_stairs:stair_stonebrick_inner" then
+				stair.name = "mcl_stairs:stair_stonebrickmossy_inner"
+			end
+			minetest.set_node(stairs[s], stair)
+		elseif r_type <= 50 then -- 20% cracky
+			if stair.name == "mcl_stairs:stair_stonebrick" then
+				stair.name = "mcl_stairs:stair_stonebrickcracked"
+			elseif stair.name == "mcl_stairs:stair_stonebrick_outer" then
+				stair.name = "mcl_stairs:stair_stonebrickcracked_outer"
+			elseif stair.name == "mcl_stairs:stair_stonebrick_inner" then
+				stair.name = "mcl_stairs:stair_stonebrickcracked_inner"
+			end
+			minetest.set_node(stairs[s], stair)
+		end
+		-- 50% no change
+	end
+
+	-- Randomly add ender eyes into end portal frames, but never fill the entire frame
+	local frames = minetest.find_nodes_in_area(p1, p2, "mcl_portals:end_portal_frame")
+	local eyes = 0
+	for f=1, #frames do
+		local r_eye = pr:next(1, 10)
+		if r_eye == 1 then
+			eyes = eyes + 1
+			if eyes < #frames then
+				local frame_node = minetest.get_node(frames[f])
+				frame_node.name = "mcl_portals:end_portal_frame_eye"
+				minetest.set_node(frames[f], frame_node)
+			end
+		end
+	end
+end
+
+
+-- Determine the stronghold positions and store them into the strongholds table.
+-- The stronghold positions are based on the world seed.
+-- The actual position might be offset by a few blocks because it might be shifted
+-- to make sure the end portal room is completely within the boundaries of a mapchunk.
+local function init_strongholds()
+	if strongholds_inited then
+		return
+	end
+	-- Don't generate strongholds in singlenode
+	if mcl_mapgen.singlenode then
+		strongholds_inited = true
+		return
+	end
+	local pr = PseudoRandom(mcl_mapgen.seed)
+	for s=1, #stronghold_rings do
+		local ring = stronghold_rings[s]
+
+		-- Get random angle
+		local angle = pr:next()
+		-- Scale angle to 0 .. 2*math.pi
+		angle = (angle / 32767) * (math.pi*2)
+		for a=1, ring.amount do
+			local dist = pr:next(ring.min, ring.max)
+			local y
+			if superflat then
+				y = mcl_mapgen.overworld.bedrock_max + offset.y
+			else
+				y = pr:next(mcl_mapgen.overworld.bedrock_max+1+offset.y, mcl_mapgen.overworld.bedrock_min+48+offset.y)
+			end
+			local pos = {
+				x = mcl_mapgen.clamp_to_chunk(math.floor(math.cos(angle) * dist) - offset.x, size.x) + offset.x,
+				y = mcl_mapgen.clamp_to_chunk(y - offset.y, size.y) + offset.y,
+				z = mcl_mapgen.clamp_to_chunk(math.floor(math.sin(angle) * dist) - offset.z, size.z) + offset.z,
+			}
+			table.insert(strongholds, { pos = pos, generated = false })
+
+			-- Rotate angle by (360 / amount) degrees.
+			-- This will cause the angles to be evenly distributed in the stronghold ring
+			angle = math.fmod(angle + ((math.pi*2) / ring.amount), math.pi*2)
+		end
+	end
+
+	mcl_structures.strongholds = strongholds
+
+	mcl_structures.register_structure({
+		name = "stronghold",
+		place_function = place,
+	})
+
+	strongholds_inited = true
+end
+
+init_strongholds()
+
+-- Stronghold generation for register_on_generated.
+mcl_mapgen.register_mapgen(function(minp, maxp, blockseed)
+	local pr = PseudoRandom(blockseed)
+	for s=1, #strongholds do
+		if not strongholds[s].generated then
+			local pos = strongholds[s].pos
+			if minp.x <= pos.x and maxp.x >= pos.x and minp.z <= pos.z and maxp.z >= pos.z and minp.y <= pos.y and maxp.y >= pos.y then
+				place(pos, nil, pr)
+				strongholds[s].generated = true
+			end
+		end
+	end
+end, mcl_mapgen.order.STRONGHOLDS)

mods/MAPGEN/mcl_structures/structures.lua

@@ -0,0 +1,17 @@
+local modname = minetest.get_current_modname()
+local modpath = minetest.get_modpath(modname)
+
+if not mcl_mapgen.singlenode then
+	dofile(modpath .. "/desert_temple.lua")
+	dofile(modpath .. "/desert_well.lua")
+	dofile(modpath .. "/end_exit_portal.lua")
+	dofile(modpath .. "/fossil.lua")
+	dofile(modpath .. "/igloo.lua")
+	dofile(modpath .. "/ice_spike_small.lua")
+	dofile(modpath .. "/ice_spike_large.lua")
+	dofile(modpath .. "/jungle_temple.lua")
+	dofile(modpath .. "/nice_jungle_temple.lua")
+	-- dofile(modpath .. "/noise_indicator.lua")
+	dofile(modpath .. "/stronghold.lua")
+	dofile(modpath .. "/witch_hut.lua")
+end

mods/MAPGEN/mcl_structures/witch_hut.lua

@@ -0,0 +1,136 @@
+local modname = minetest.get_current_modname()
+local modpath = minetest.get_modpath(modname)
+
+local chance_per_chunk = 3
+local noise_multiplier = -0.9
+local random_offset    = 8
+local scanning_ratio   = 0.01
+local struct_threshold = chance_per_chunk - 1
+
+local mcl_structures_get_perlin_noise_level = mcl_structures.get_perlin_noise_level
+
+local schematic_file = modpath .. "/schematics/mcl_structures_witch_hut.mts"
+
+local witch_hut_schematic_lua = minetest.serialize_schematic(schematic_file, "lua", {lua_use_comments = false, lua_num_indent_spaces = 0}) .. " return schematic"
+local witch_hut_schematic = loadstring(witch_hut_schematic_lua)()
+
+local node_list = {"mcl_core:dirt_with_grass", "mcl_core:dirt"}
+
+local WITCH_HUT_HEIGHT = 2 -- Exact Y level to spawn witch huts at. This height refers to the height of the floor
+
+local witch_hut_offsets = {
+	["0"] = {
+		{x=1, y=0, z=1}, {x=1, y=0, z=5}, {x=6, y=0, z=1}, {x=6, y=0, z=5},
+	},
+	["180"] = {
+		{x=2, y=0, z=1}, {x=2, y=0, z=5}, {x=7, y=0, z=1}, {x=7, y=0, z=5},
+	},
+	["270"] = {
+		{x=1, y=0, z=1}, {x=5, y=0, z=1}, {x=1, y=0, z=6}, {x=5, y=0, z=6},
+	},
+	["90"] = {
+		{x=1, y=0, z=2}, {x=5, y=0, z=2}, {x=1, y=0, z=7}, {x=5, y=0, z=7},
+	},
+}
+
+local function on_placed(place, rotation, pr, size)
+	local offsets = witch_hut_offsets[rotation]
+	if not offsets then return end
+	for _, offset in pairs(offsets) do
+		local tpos = vector.add(place, offset)
+		for y = place.y - 1, mcl_mapgen.get_chunk_beginning(place.y - 1), -1 do
+			tpos.y = y
+			local nn = minetest.get_node(tpos).name
+	 		if not nn then break end
+       			local node = minetest.registered_nodes[nn]
+			local groups = node.groups
+			if nn == "mcl_flowers:waterlily" or nn == "mcl_core:water_source" or nn == "mcl_core:water_flowing" or nn == "air" or groups.deco_block then
+				minetest.swap_node(tpos, {name="mcl_core:tree"})
+			else
+ 				break
+			end
+		end
+	end
+end
+
+
+local function place(pos, rotation, pr)
+	mcl_structures.place_schematic({pos = pos, rotaton = rotation, schematic = witch_hut_schematic, pr = pr, on_placed = on_placed})
+end
+
+local function get_place_rank(pos)
+	local x, y, z = pos.x, pos.y, pos.z
+	local p1 = {x = x + 1, y = y + 1, z = z + 1}
+	local p2 = {x = x + 4, y = y + 4, z = z + 4}
+	local counter = #minetest.find_nodes_in_area(p1, p2, {"air", "group:buildable_to", "group:deco_block"}, false)
+	return counter
+end
+
+local function tune_pos(pos)
+	local pos = table.copy(pos)
+	local y = pos.y - 1
+	if y >= WITCH_HUT_HEIGHT - 5 and y <= WITCH_HUT_HEIGHT + 5 then
+		pos.y = WITCH_HUT_HEIGHT
+		return pos
+	end
+	local x = pos.x
+	local z = pos.z
+	local p1 = {x = x - 3, y = y    , z = z - 3}
+	local p2 = {x = x + 3, y = y + 2, z = z + 3}
+	local water_list = minetest.find_nodes_in_area(p1, p2, {"group:water"}, false)
+	if not water_list or #water_list < 1 then
+		pos.y = y
+		return pos
+	end
+	local top = -1
+	for _, pos in pairs(water_list) do
+		if pos.y > top then
+			top = pos.y
+		end
+	end
+	pos.y = top
+	return pos
+end
+
+mcl_structures.register_structure({
+	name = "witch_hut",
+	decoration = {
+		deco_type = "simple",
+		place_on = node_list,
+		spawn_by = {"mcl_core:water_source", "group:frosted_ice"},
+		num_spawn_by = 1,
+		-- flags = "all_floors",
+		fill_ratio = scanning_ratio,
+		y_min = mcl_mapgen.overworld.min,
+		y_max = mcl_mapgen.overworld.max,
+		height = 1,
+		biomes = mcl_mapgen.v6 and {
+			"Normal",
+		} or {
+			"Swampland",
+			"Swampland_shore",
+			"Swampland_ocean",
+			"Swampland_deep_ocean",
+		},
+	},
+	on_finished_chunk = function(minp, maxp, seed, vm_context, pos_list)
+		local pr = PseudoRandom(seed + random_offset)
+		local random_number = pr:next(1, chance_per_chunk)
+		local noise = mcl_structures_get_perlin_noise_level(minp) * noise_multiplier
+		if (random_number + noise) < struct_threshold then return end
+		local pos = tune_pos(pos_list[1])
+		if #pos_list > 1 then
+			local count = get_place_rank(pos)
+			for i = 2, #pos_list do
+				local pos_i = pos_list[i]
+				local count_i = get_place_rank(pos_i)
+				if count_i > count then
+					count = count_i
+					pos = pos_i
+				end
+			end
+		end
+		place(pos, nil, pr)
+	end,
+	place_function = place,
+})

mods/MAPGEN/mcl_villages/README.txt

@@ -1,6 +1,6 @@
 MCL_Villages:
 ============================
-A fork of Rochambeau's "Settlements" mod converted for use in MineClone2.
+A fork of Rochambeau's "Settlements" mod converted for use in MineClone5.
 
 --------------
 Using the mod:

mods/MAPGEN/mcl_villages/buildings.lua

@@ -88,7 +88,7 @@ function settlements.create_site_plan(maxp, minp, pr)
 	-- find center_surface of chunk
 	local center_surface , surface_material = settlements.find_surface(center, true)
 	local chunks = {}
-	chunks[mcl_vars.get_chunk_number(center)] = true
+	chunks[mcl_mapgen.get_chunk_number(center)] = true
 
 	-- go build settlement around center
 	if not center_surface then return false end
@@ -124,7 +124,7 @@ function settlements.create_site_plan(maxp, minp, pr)
 			ptx = settlements.round(ptx, 0)
 			ptz = settlements.round(ptz, 0)
 			local pos1 = { x=ptx, y=center_surface.y+50, z=ptz}
-			local chunk_number = mcl_vars.get_chunk_number(pos1)
+			local chunk_number = mcl_mapgen.get_chunk_number(pos1)
 			local pos_surface, surface_material
 			if chunks[chunk_number] then
 				pos_surface, surface_material = settlements.find_surface(pos1)
@@ -268,15 +268,13 @@ function settlements.place_schematics(settlement_info, pr)
 		local schematic = loadstring(schem_lua)()
 		-- build foundation for the building an make room above
 		-- place schematic
-		mcl_structures.place_schematic(
+		mcl_structures.place_schematic({
-			pos,
+			pos = pos,
-			schematic,
+			schematic = schematic,
-			rotation,
+			rotation = rotation,
-			nil,
+			force_placement = true,
-			true,
+			on_place = init_nodes,
-			nil,
+			pr = pr,
-			init_nodes,
+		})
-			pr
-		)
 	end
 end

mods/MAPGEN/mcl_villages/init.lua

@@ -1,6 +1,8 @@
 settlements = {}
 settlements.modpath = minetest.get_modpath(minetest.get_current_modname())
 
+local minetest_get_spawn_level = minetest.get_spawn_level
+
 dofile(settlements.modpath.."/const.lua")
 dofile(settlements.modpath.."/utils.lua")
 dofile(settlements.modpath.."/foundation.lua")
@@ -53,6 +55,7 @@ end
 -- on map generation, try to build a settlement
 --
 local function build_a_settlement(minp, maxp, blockseed)
+	minetest.log("action","[mcl_villages] Building village at mapchunk " .. minetest.pos_to_string(minp) .. "..." .. minetest.pos_to_string(maxp) .. ", blockseed = " .. tostring(blockseed))
 	local pr = PseudoRandom(blockseed)
 
 	-- fill settlement_info with buildings and their data
@@ -69,29 +72,38 @@ local function build_a_settlement(minp, maxp, blockseed)
 	settlements.place_schematics(settlement_info, pr)
 end
 
-local function ecb_village(blockpos, action, calls_remaining, param)
-	if calls_remaining >= 1 then return end
-	local minp, maxp, blockseed = param.minp, param.maxp, param.blockseed
-	build_a_settlement(minp, maxp, blockseed)
-end
-
 -- Disable natural generation in singlenode.
 local mg_name = minetest.get_mapgen_setting("mg_name")
 if mg_name ~= "singlenode" then
-	mcl_mapgen_core.register_generator("villages", nil, function(minp, maxp, blockseed)
+	mcl_mapgen.register_mapgen(function(minp, maxp, blockseed)
+		-- local str1 = (maxp.y >= 0 and blockseed % 77 == 17) and "YES" or "no"
+		-- minetest.log("action","[mcl_villages] " .. str1 .. ": minp=" .. minetest.pos_to_string(minp) .. ", maxp=" .. minetest.pos_to_string(maxp) .. ", blockseed=" .. tostring(blockseed))
 		-- don't build settlement underground
 		if maxp.y < 0 then return end
 		-- randomly try to build settlements
 		if blockseed % 77 ~= 17 then return end
-		-- needed for manual and automated settlement building
+
 		-- don't build settlements on (too) uneven terrain
-		--local heightmap = minetest.get_mapgen_object("heightmap")
+
-		local height_difference = settlements.evaluate_heightmap()
+		-- lame and quick replacement of `heightmap` by kay27 - we maybe need to restore `heightmap` analysis if there will be a way for the engine to avoid cavegen conflicts:
+		--------------------------------------------------------------------------
+		local height_difference, min, max
+		local pr1=PseudoRandom(blockseed)
+		for i=1,pr1:next(5,10) do
+			local x = pr1:next(0, 40) + minp.x + 19
+			local z = pr1:next(0, 40) + minp.z + 19
+			local y = minetest_get_spawn_level(x, z)
+			if not y then return end
+			if y < (min or y+1) then min = y end
+			if y > (max or y-1) then max = y end
+		end
+		height_difference = max - min + 1
+		--------------------------------------------------------------------------
+
 		if height_difference > max_height_difference then return end
 
-		local param={minp=vector.new(minp), maxp=vector.new(maxp), blockseed=blockseed}
+		build_a_settlement(minp, maxp, blockseed)
-		minetest.emerge_area(minp, maxp, ecb_village, param)
+	end, mcl_mapgen.order.VILLAGES)
-	end)
 end
 -- manually place villages
 if minetest.is_creative_enabled("") then

mods/MAPGEN/mcl_villages/utils.lua

@@ -1,4 +1,4 @@
-local get_node = mcl_vars.get_node
+local get_node = mcl_mapgen.get_far_node
 
 -------------------------------------------------------------------------------
 -- function to copy tables
@@ -207,44 +207,6 @@ function shuffle(tbl, pr)
 	return table
 end
 -------------------------------------------------------------------------------
--- evaluate heightmap
--------------------------------------------------------------------------------
-function settlements.evaluate_heightmap()
-	local heightmap = minetest.get_mapgen_object("heightmap")
-	-- max height and min height, initialize with impossible values for easier first time setting
-	local max_y = -50000
-	local min_y = 50000
-	-- only evaluate the center square of heightmap 40 x 40
-	local square_start = 1621
-	local square_end = 1661
-	for j = 1 , 40, 1 do
-		for i = square_start, square_end, 1 do
-			-- skip buggy heightmaps, return high value
-			if heightmap[i] == -31000 or heightmap[i] == 31000 then
-				return max_height_difference + 1
-			end
-			if heightmap[i] < min_y then
-				min_y = heightmap[i]
-			end
-			if heightmap[i] > max_y then
-				max_y = heightmap[i]
-			end
-		end
-		-- set next line
-		square_start = square_start + 80
-		square_end = square_end + 80
-	end
-	-- return the difference between highest and lowest pos in chunk
-	local height_diff = max_y - min_y
-	-- filter buggy heightmaps
-	if height_diff <= 1 then
-		return max_height_difference + 1
-	end
-	-- debug info
-	settlements.debug("heightdiff ".. height_diff)
-	return height_diff
-end
--------------------------------------------------------------------------------
 -- Set array to list
 -- https://stackoverflow.com/questions/656199/search-for-an-item-in-a-lua-list
 -------------------------------------------------------------------------------

mods/MAPGEN/tsm_railcorridors/init.lua

@@ -19,8 +19,7 @@ end
 local probability_railcaves_in_mapchunk = P(0.33333)
 setting = tonumber(minetest.settings:get("tsm_railcorridors_probability_railcaves_in_mapchunk"))
 -- Extra check to prevent mod griefing in singlenode, mcimported worlds.
-local mg_name = minetest.get_mapgen_setting("mg_name")
+if mcl_mapgen.singlenode then
-if mg_name == "singlenode" then
 	probability_railcaves_in_mapchunk = P(0)
 elseif setting then
 	probability_railcaves_in_mapchunk = P(setting)
@@ -96,10 +95,10 @@ end
 
 -- Max. and min. heights between rail corridors are generated
 local height_min
-if mcl_vars.mg_lava then
+if mcl_mapgen.lava then
-	height_min = mcl_vars.mg_lava_overworld_max + 2
+	height_min = mcl_mapgen.overworld.lava_max + 2
 else
-	height_min = mcl_vars.mg_bedrock_overworld_max + 2
+	height_min = mcl_mapgen.overworld.bedrock_max + 2
 end
 local height_max = mcl_worlds.layer_to_y(60)
 
@@ -1093,7 +1092,7 @@ local function create_corridor_system(main_cave_coords)
 end
 
 -- The rail corridor algorithm starts here
-mcl_mapgen_core.register_generator("railcorridors", nil, function(minp, maxp, blockseed, _pr)
+mcl_mapgen.register_mapgen(function(minp, maxp, blockseed)
 	-- We re-init the randomizer for every mapchunk as we start generating in the middle of each mapchunk.
 	-- We can't use the mapgen seed as this would make the algorithm depending on the order the mapchunk generate.
 	InitRandomizer(blockseed)

mods/PLAYER/mcl_spawn/init.lua

@@ -81,7 +81,7 @@ local dir_step = storage:get_int("mcl_spawn_dir_step") or 0
 local dir_ind = storage:get_int("mcl_spawn_dir_ind") or 1
 local emerge_pos1, emerge_pos2
 
-local spawn_limit = mcl_vars.mapgen_edge_max
+local spawn_limit = mcl_mapgen.EDGE_MAX
 
 
 --Functions
@@ -500,7 +500,11 @@ function mcl_spawn.shadow_worker()
 
 	if success then
 		local wsp_node = minetest.get_node(wsp)
-		if not (wsp_node and wsp_node.name == "ignore")
+		if wsp_node and 
+		(
+			(minetest.compare_block_status and (minetest.compare_block_status(wsp, "loaded") or minetest.compare_block_status(wsp, "active")))
+			or minetest.get_node_or_nil(wsp)
+		)
 		and ((not good_for_respawn(wsp)) or ((no_trees_area_counter >= 0) and not can_find_tree(wsp))) then
 			success = false
 			minetest.log("action", "[mcl_spawn] World spawn position isn't safe anymore: "..minetest.pos_to_string(wsp))

mods/PLAYER/mcl_spawn/mod.conf

@@ -1,4 +1,4 @@
 name = mcl_spawn
 author = Wuzzy
 description = Set and get the player's respawn position
-depends = mcl_init
+depends = mcl_mapgen