Add Structure placement api

mods/MAPGEN/mcl_shipwrecks/init.lua

@@ -8,11 +8,11 @@ local pr = PseudoRandom(seed)
 
 --schematics by chmodsayshello
 local schems = {
-	"shipwreck_full_damaged",
+	modpath.."/schematics/".."shipwreck_full_damaged"..".mts",
-	"shipwreck_full_normal",
+	modpath.."/schematics/".."shipwreck_full_normal"..".mts",
-	"shipwreck_full_back_damaged",
+	modpath.."/schematics/".."shipwreck_full_back_damaged"..".mts",
-	"shipwreck_half_front",
+	modpath.."/schematics/".."shipwreck_half_front"..".mts",
-	"shipwreck_half_back",
+	modpath.."/schematics/".."shipwreck_half_back"..".mts",
 }
 
 local function get_supply_loot()
@@ -75,61 +75,97 @@ local function fill_chests(p1,p2)
 	end
 end
 
-local function get_ocean_biomes()
+local ocean_biomes = {
-	local r = {}
+	"RoofedForest_ocean",
-	for k,_ in pairs(minetest.registered_biomes) do
+	"JungleEdgeM_ocean",
-		if k:find("_ocean") then table.insert(r,k) end
+	"BirchForestM_ocean",
-	end
+	"BirchForest_ocean",
-	return r
+	"IcePlains_deep_ocean",
-end
+	"Jungle_deep_ocean",
-local function get_beach_biomes()
+	"Savanna_ocean",
-	local r = {}
+	"MesaPlateauF_ocean",
-	for k,_ in pairs(minetest.registered_biomes) do
+	"ExtremeHillsM_deep_ocean",
-		if k:find("_beach") or k:find("_shore") then table.insert(r,k) end
+	"Savanna_deep_ocean",
-	end
+	"SunflowerPlains_ocean",
-	return r
+	"Swampland_deep_ocean",
-end
+	"Swampland_ocean",
+	"MegaSpruceTaiga_deep_ocean",
+	"ExtremeHillsM_ocean",
+	"JungleEdgeM_deep_ocean",
+	"SunflowerPlains_deep_ocean",
+	"BirchForest_deep_ocean",
+	"IcePlainsSpikes_ocean",
+	"Mesa_ocean",
+	"StoneBeach_ocean",
+	"Plains_deep_ocean",
+	"JungleEdge_deep_ocean",
+	"SavannaM_deep_ocean",
+	"Desert_deep_ocean",
+	"Mesa_deep_ocean",
+	"ColdTaiga_deep_ocean",
+	"Plains_ocean",
+	"MesaPlateauFM_ocean",
+	"Forest_deep_ocean",
+	"JungleM_deep_ocean",
+	"FlowerForest_deep_ocean",
+	"MushroomIsland_ocean",
+	"MegaTaiga_ocean",
+	"StoneBeach_deep_ocean",
+	"IcePlainsSpikes_deep_ocean",
+	"ColdTaiga_ocean",
+	"SavannaM_ocean",
+	"MesaPlateauF_deep_ocean",
+	"MesaBryce_deep_ocean",
+	"ExtremeHills+_deep_ocean",
+	"ExtremeHills_ocean",
+	"MushroomIsland_deep_ocean",
+	"Forest_ocean",
+	"MegaTaiga_deep_ocean",
+	"JungleEdge_ocean",
+	"MesaBryce_ocean",
+	"MegaSpruceTaiga_ocean",
+	"ExtremeHills+_ocean",
+	"Jungle_ocean",
+	"RoofedForest_deep_ocean",
+	"IcePlains_ocean",
+	"FlowerForest_ocean",
+	"ExtremeHills_deep_ocean",
+	"MesaPlateauFM_deep_ocean",
+	"Desert_ocean",
+	"Taiga_ocean",
+	"BirchForestM_deep_ocean",
+	"Taiga_deep_ocean",
+	"JungleM_ocean"
+}
 
-minetest.register_node("mcl_shipwrecks:structblock", {drawtype="airlike", walkable = false, pointable = false,groups = {structblock=1,not_in_creative_inventory=1}})
+local beach_biomes = {
+	"FlowerForest_beach",
+	"Forest_beach",
+	"StoneBeach",
+	"ColdTaiga_beach_water",
+	"Taiga_beach",
+	"Savanna_beach",
+	"Plains_beach",
+	"ExtremeHills_beach",
+	"ColdTaiga_beach",
+	"Swampland_shore",
+	"MushroomIslandShore",
+	"JungleM_shore",
+	"Jungle_shore"
+}
 
-minetest.register_decoration({
+mcl_structures.register_structure("shipwreck",{
-	decoration = "mcl_shipwrecks:structblock",
-	deco_type = "simple",
 	place_on = {"group:sand","mcl_core:gravel"},
 	spawn_by = {"group:water"},
 	num_spawn_by = 4,
-	sidelen = 80,
 	fill_ratio = 0.00002,
 	flags = "place_center_x, place_center_z, force_placement",
-	biomes = get_ocean_biomes(),
+	biomes = ocean_biomes,
-	y_max=water_level-4,
+	y_max = water_level-4,
-})
+	y_min = mcl_vars.mg_overworld_min,
-
+	filenames = schems,
---rare beached variant
+	y_offset = function(pr) return pr:next(-4,-2) end,
-minetest.register_decoration({
+	after_place = function(pos)
-	decoration = "mcl_shipwrecks:structblock",
-	deco_type = "simple",
-	place_on = {"group:sand","mcl_core:gravel","group:dirt"},
-	spawn_by = {"group:water","air"},
-	num_spawn_by = 4,
-	sidelen = 80,
-	fill_ratio=0.000001,
-	flags = "place_center_x, place_center_z, force_placement",
-	biomes = get_beach_biomes(),
-	y_max = water_level + 4,
-	y_min = water_level - 1,
-})
-
-minetest.register_lbm({
-	name = "mcl_shipwrecks:struct_lbm",
-	run_at_every_load = true,
-	nodenames = {"mcl_shipwrecks:structblock"},
-	action = function(pos, node)
-		minetest.set_node(pos,{name="air"})
-		local file = modpath.."/schematics/"..schems[pr:next(1,#schems)]..".mts"
-		local pp = vector.offset(pos,0,pr:next(-4,-2),0)
-		mcl_structures.place_schematic(pp, file, "random", nil, true, "place_center_x,place_center_z", function()
 		fill_chests(vector.offset(pos,-20,-5,-20),vector.offset(pos,20,15,20))
-		end,pr)
 	end
 })

mods/MAPGEN/mcl_structures/api.lua

@@ -0,0 +1,69 @@
+local registered_structures = {}
+
+--[[] structure def:
+{
+	fill_ratio= OR noise = {} 
+	biomes =
+	y_min =
+	y_max =
+	place_on =
+	spawn_by =
+	num_spawn_by =
+	flags = (default: "place_center_x, place_center_z, force_placement")
+	(same as decoration def)
+	y_offset =
+	filenames = {} OR place_func = function(pos,filename)
+	after_place = function(pos)
+}
+]]--
+
+function mcl_structures.register_structure(name,def,nospawn) --nospawn means it will be placed by another (non-nospawn) structure that contains it's structblock i.e. it will not be placed by mapgen directly
+	local structblock = "mcl_structures:structblock_"..name
+	minetest.register_node(":"..structblock, {drawtype="airlike", walkable = false, pointable = false,groups = {structblock=1,not_in_creative_inventory=1}})
+	local flags = "place_center_x, place_center_z, force_placement"
+	local y_offset = 0
+	if def.flags then flags = def.flags end
+	def.name = name
+	if nospawn == nil then
+		def.deco = minetest.register_decoration({
+			decoration = structblock,
+			deco_type = "simple",
+			place_on = def.place_on,
+			spawn_by = def.spawn_by,
+			num_spawn_by = def.num_spawn_by,
+			sidelen = 80,
+			fill_ratio = def.fill_ratio,
+			noise = def.noise,
+			flags = flags,
+			biomes = def.biomes,
+			y_max = def.y_max,
+			y_min = def.y_min
+		})
+	end
+	registered_structures[name] = def
+end
+
+minetest.register_lbm({
+	name = "mcl_structures:struct_lbm",
+	run_at_every_load = true,
+	nodenames = {"group:structblock"},
+	action = function(pos, node)
+		local name = node.name:gsub("mcl_structures:structblock_","")
+		local pr = PseudoRandom(pos.x+pos.y+pos.z)
+		local def = registered_structures[name]
+		local y_offset = 0
+		minetest.set_node(pos,{name="air"})
+		if type(def.y_offset) == "function" then
+			y_offset = def.y_offset(pr)
+		elseif def.y_offset then
+			y_offset = def.y_offset
+		end
+		if def.filenames then
+			local file = def.filenames[pr:next(1,#def.filenames)]
+			local pp = vector.offset(pos,0,y_offset,0)
+			mcl_structures.place_schematic(pp, file, "random", nil, true, "place_center_x,place_center_z",def.after_place,pr,{pos,def})
+		elseif def.place_func and def.place_func(pos,def) then
+			def.after_place(pos,def)
+		end
+	end
+})

mods/MAPGEN/mcl_structures/init.lua

@@ -571,6 +571,8 @@ local function dir_to_rotation(dir)
 	return "0"
 end
 
+dofile(modpath.."/api.lua")
+
 -- 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",