Introduced the ability to register a fallback or layer generator with

arguments, updated simple generator to allow switching between different
content ids for the terrain generation, i.e. it can now switch between
stone and sandstone (the one registered is sandstone, the fallback does
not specify arguments during registration so it uses a default, stone).

multi_map_core/init.lua

@@ -33,18 +33,39 @@ function multi_map.get_offset_y(y)
 	return y - center_point
 end
 
-function multi_map.register_fallback_generator(generator)
-	multi_map.fallback_generator = generator
+function multi_map.register_fallback_generator(...)
+	local arg = {...}
+	local generator
+	local arguments
+
+	if arg[2] then
+		generator = arg[1]
+		arguments = arg[2]
+	else
+		generator = arg[1]
+	end
+	multi_map.fallback_generator = { generator = generator, arguments = arguments }
 end
 
 function multi_map.register_generator(...)
 	local arg = {...}
 	local position
 	local generator
+	local arguments
 
-	if arg[2] then
+	if arg[3] then
 		position = arg[1]
 		generator = arg[2]
+		arguments = arg[3]
+		print(arguments)
+	elseif arg[2] then
+		if type(arg[1]) == "function" then
+			generator = arg[1]
+			arguments = arg[2]
+		else
+			position = arg[1]
+			generator = arg[2]
+		end
 	else
 		generator = arg[1]
 	end
@@ -56,7 +77,7 @@ function multi_map.register_generator(...)
 				t = {}
 				multi_map.generators[i] = t
 			end
-			table.insert(t, generator)
+			table.insert(t, { generator = generator, arguments = arguments })
 		end
 	else
 		local t = multi_map.generators[position]
@@ -64,7 +85,7 @@ function multi_map.register_generator(...)
 			t = {}
 			multi_map.generators[position] = t
 		end
-		table.insert(t, generator)
+		table.insert(t, { generator = generator, arguments = arguments })
 	end
 end
 
@@ -83,6 +104,7 @@ end
 local firstrun = true
 -- Global helpers for mapgens
 multi_map.c_stone = nil
+multi_map.c_sandstone = nil
 multi_map.c_air = nil
 multi_map.c_water = nil
 multi_map.c_lava = nil
@@ -98,6 +120,7 @@ end)
 minetest.register_on_generated(function(minp, maxp)
 	if firstrun then
 		multi_map.c_stone = minetest.get_content_id("default:stone")
+		multi_map.c_sandstone = minetest.get_content_id("default:sandstone")
 		multi_map.c_air = minetest.get_content_id("air")
 		multi_map.c_water = minetest.get_content_id("default:water_source")
 		multi_map.c_lava = minetest.get_content_id("default:lava_source")
@@ -145,14 +168,14 @@ minetest.register_on_generated(function(minp, maxp)
 		local t = multi_map.generators[multi_map.current_layer]
 		if not t then
 			if multi_map.fallback_generator then
-				multi_map.fallback_generator(multi_map.current_layer, minp, maxp, offset_minp, offset_maxp)
+				multi_map.fallback_generator.generator(multi_map.current_layer, minp, maxp, offset_minp, offset_maxp, multi_map.fallback_generator.arguments)
 			else
 				minetest.log("error", "Generator for layer "..multi_map.current_layer.." missing and no fallback specified, exiting mapgen!")
 				return
 			end
 		else
 			for i,f in ipairs(t) do
-				f(multi_map.current_layer, minp, maxp, offset_minp, offset_maxp)
+				f.generator(multi_map.current_layer, minp, maxp, offset_minp, offset_maxp, f.arguments)
 			end
 		end
 	end

multi_map_generators/init.lua

@@ -6,6 +6,7 @@ dofile(multi_map_generators_path.."/mmgen_simple.lua")
 dofile(multi_map_generators_path.."/mmgen_testauri.lua")
 
 multi_map.register_fallback_generator(mmgen_simple.generate)
+multi_map.register_generator(10, mmgen_simple.generate, "default:sandstone")
 multi_map.register_generator(11, mmgen_testauri.generate)
 multi_map.register_generator(12, mmgen_testauri.generate)
 multi_map.register_generator(13, mmgen_testauri.generate)

multi_map_generators/mmgen_simple.lua

@@ -1,15 +1,24 @@
 mmgen_simple = {}
 
-function mmgen_simple.generate(current_layer, minp, maxp, offset_minp, offset_maxp)
+function mmgen_simple.generate(current_layer, minp, maxp, offset_minp, offset_maxp, content_id)
 	local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
 	local area = VoxelArea:new({MinEdge = emin, MaxEdge = emax})
 	local vm_data = vm:get_data()
+
+	local c_ground
+	if content_id then
+		c_ground = minetest.get_content_id(content_id)
+	else
+		c_ground = multi_map.c_stone
+	end
+
 	if offset_minp.y >= 0 then
 		multi_map.generate_singlenode_chunk(minp, maxp, area, vm_data, multi_map.c_air)
 		vm:set_lighting({day=15, night=0})
 	else
-		multi_map.generate_singlenode_chunk(minp, maxp, area, vm_data, multi_map.c_stone)
+		multi_map.generate_singlenode_chunk(minp, maxp, area, vm_data, c_ground)
 	end
+
 	vm:set_data(vm_data)
 	vm:calc_lighting(false)
 	vm:write_to_map(false)