1 files changed, 67 insertions, 0 deletions
diff --git a/struct_register.lua b/struct_register.lua
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index 0000000..1143753
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+++ b/struct_register.lua
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+-- struct_register.lua - registration callbacks for structures.
+
+--[[
+The cellworld table contains the following structure-related entries:
+cellworld = {
+	structures = {
+		[st_name] = {...} -- all registered structures.
+	}
+	structure_set = {
+		-- the active structure set config, which determines grid size, mapgen base node a.s.o as passed to config_structure_set()
+		name = "foo" -- name of the active structure set (which is actually the first parameter), not specified in table.
+		grid_size = 7 -- how many nodes form a cell.
+		mapgen_base_node = "air" -- which node to place by default in map, passed to singlenode mg. TODO not implemented yet.
+	}
+	-- the most important settings from structure set are copied for easier access
+	grid_size = structure_set.grid_size,
+	
+	-- of all registered structures, the maximum extents in x, y and z direction.
+	maximum_structure_size = vector.new(1,1,1)
+}
+]]--
+
+cellworld.structures = {}
+
+function cellworld.config_structure_set(name, definition)
+	if cellworld.structure_set then
+		error("Cellworld: Trying to register structure set '"..name.."', but '"..cellworld.structure_set.name..
+			"' has already been registered. There can only be one active structure set at a time.")
+	end
+	cellworld.structure_set = {
+		name = name,
+		grid_size = 9,
+		seed_structure = definition.seed_structure,
+	}
+	if definition.grid_size then
+		cellworld.structure_set.grid_size = definition.grid_size
+	end
+	
+	cellworld.grid_size = cellworld.structure_set.grid_size
+	
+	cellworld.maximum_structure_size = vector.new(1,1,1)
+end
+
+function cellworld.register_structure(name, def)
+	-- make definition checks
+	if not cellworld.structure_set then
+		error("Cellworld: can not register structures when config_structure_set() hasn't been called!")
+	elseif def.structure_set and def.structure_set ~= cellworld.structure_set.name then
+		error("Cellworld: Structure '"..name.."' can not be registered because the structure set it was defined for ('"..name..
+			"') doesn't match the active structure set ('"..cellworld.structure_set.name.."')!")
+	end
+	
+	if not def.chance then
+		def.chance = 50
+	end
+	
+	-- TODO validate structure of cells
+	
+	cellworld.structures[name] = def
+	
+	-- update maxstructsize
+	local mss = cellworld.maximum_structure_size
+	mss.x = math.max(def.size.x, mss.x)
+	mss.y = math.max(def.size.y, mss.y)
+	mss.z = math.max(def.size.z, mss.z)
+	
+end