Disable mapgen by default, minetest has snow biomes now.

settingtypes.txt

@@ -33,3 +33,6 @@ mapgen_rarity (Snow Biome Rarity %) float 18
 
 #size of the generated… (has an effect to the rarity, too)
 mapgen_size (Snow Biome Size) float 210
+
+#Minetest finally has capable snow biomes by default, lets not mess it up with the old snowgen.
+disable_mapgen (Disable mod-generated biomes) bool true

src/mapgen.lua

@@ -12,63 +12,66 @@ saplings grow into trees. --]]
 
 -- Part 1: To disable the mapgen, add the *starting* comment under this line.
 
+if not snow.disable_mapgen then
+	print("[snow] Mapgen enabled!")
+	
+	snow.mapgen = snow.mapgen or {}
+	local mg = snow.mapgen
 
-snow.mapgen = snow.mapgen or {}
-local mg = snow.mapgen
-
--- perlin noise "hills" are not peaks but looking like sinus curve
-local function upper_rarity(rarity)
-	return math.sign(rarity)*math.sin(math.abs(rarity)*math.pi/2)
-end
-
-local rarity = snow.mapgen_rarity
-local size = snow.mapgen_size
-local smooth = snow.smooth_biomes
-
-local nosmooth_rarity, perlin_scale
-local function calc_values()
-	nosmooth_rarity = 1-rarity/50
-	perlin_scale = size*100/rarity
-	mg.perlin_scale = perlin_scale
-	local smooth_rarity_max, smooth_rarity_min, smooth_rarity_dif
-	if smooth then
-		local smooth_trans_size = 4 --snow.smooth_trans_size
-		mg.smooth_rarity_max = upper_rarity(nosmooth_rarity+smooth_trans_size*2/perlin_scale)
-		mg.smooth_rarity_min = upper_rarity(nosmooth_rarity-smooth_trans_size/perlin_scale)
-		mg.smooth_rarity_dif = mg.smooth_rarity_max-mg.smooth_rarity_min
+	-- perlin noise "hills" are not peaks but looking like sinus curve
+	local function upper_rarity(rarity)
+		return math.sign(rarity)*math.sin(math.abs(rarity)*math.pi/2)
 	end
-	nosmooth_rarity = upper_rarity(nosmooth_rarity)
-	mg.nosmooth_rarity = nosmooth_rarity
-end
-calc_values()
 
-snow.register_on_configuring(function(name, v)
-	if name == "mapgen_rarity" then
-		rarity = v
-	elseif name == "mapgen_size" then
-		size = v
-	elseif name == "smooth_biomes" then
-		smooth = v
-	else
-		return
+	local rarity = snow.mapgen_rarity
+	local size = snow.mapgen_size
+	local smooth = snow.smooth_biomes
+
+	local nosmooth_rarity, perlin_scale
+	local function calc_values()
+		nosmooth_rarity = 1-rarity/50
+		perlin_scale = size*100/rarity
+		mg.perlin_scale = perlin_scale
+		local smooth_rarity_max, smooth_rarity_min, smooth_rarity_dif
+		if smooth then
+			local smooth_trans_size = 4 --snow.smooth_trans_size
+			mg.smooth_rarity_max = upper_rarity(nosmooth_rarity+smooth_trans_size*2/perlin_scale)
+			mg.smooth_rarity_min = upper_rarity(nosmooth_rarity-smooth_trans_size/perlin_scale)
+			mg.smooth_rarity_dif = mg.smooth_rarity_max-mg.smooth_rarity_min
+		end
+		nosmooth_rarity = upper_rarity(nosmooth_rarity)
+		mg.nosmooth_rarity = nosmooth_rarity
 	end
-	-- TODO: if e.g. size and rarity get changed at once, don't calculate the values more times
 	calc_values()
-end)
+
+	snow.register_on_configuring(function(name, v)
+		if name == "mapgen_rarity" then
+			rarity = v
+		elseif name == "mapgen_size" then
+			size = v
+		elseif name == "smooth_biomes" then
+			smooth = v
+		else
+			return
+		end
+		-- TODO: if e.g. size and rarity get changed at once, don't calculate the values more times
+		calc_values()
+	end)
 
 
---Identify the mapgen.
-local mgname = minetest.get_mapgen_setting"mg_name"
-if not mgname then
-	minetest.log("error", "[MOD] Snow Biomes: WARNING! mapgen could not be identifyed!")
-end
-local path = minetest.get_modpath"snow"
-if mgname == "v7" then
-	--Load mapgen_v7 compatibility.
-	dofile(path.."/src/mapgen_v7.lua")
-else
-	--Load mapgen_v6 compatibility.
-	dofile(path.."/src/mapgen_v6.lua")
+	--Identify the mapgen.
+	local mgname = minetest.get_mapgen_setting"mg_name"
+	if not mgname then
+		minetest.log("error", "[MOD] Snow Biomes: WARNING! mapgen could not be identifyed!")
+	end
+	local path = minetest.get_modpath"snow"
+	if mgname == "v7" then
+		--Load mapgen_v7 compatibility.
+		dofile(path.."/src/mapgen_v7.lua")
+	else
+		--Load mapgen_v6 compatibility.
+		dofile(path.."/src/mapgen_v6.lua")
+	end
 end
 
 -- To complete the commenting-out add the *closing* comment under this line.

src/mapgen_v6.lua

@@ -142,10 +142,10 @@ local function define_contents()
 end
 
 local smooth = snow.smooth_biomes
-local smooth_rarity_max = mg.smooth_rarity_max
-local smooth_rarity_min = mg.smooth_rarity_min
-local smooth_rarity_dif = mg.smooth_rarity_dif
-local nosmooth_rarity = mg.nosmooth_rarity
+local smooth_rarity_max = mg.smooth_rarity_max or 0
+local smooth_rarity_min = mg.smooth_rarity_min or 0
+local smooth_rarity_dif = mg.smooth_rarity_dif or 0
+local nosmooth_rarity = mg.nosmooth_rarity or 0
 
 snow.register_on_configuring(function(name, v)
 	if name == "debug" then
@@ -235,7 +235,7 @@ minetest.register_on_generated(function(minp, maxp, seed)
 	for z = z0, z1 do
 	for x = x0, x1 do
 		local in_biome = false
-		local test
+		local test = 0
 		if nvals_default[ni] < 0.35 then
 			nvals_cold = nvals_cold or perlin_objs.cold:get2dMap_flat({x=x0, y=z0}, nbuf_cold)
 			test = math.min(nvals_cold[ni], 1)

src/util.lua

@@ -12,6 +12,7 @@ snow = {
 	min_height = tonumber(minetest.settings:get("min_height")) or 3,
 	mapgen_rarity = tonumber(minetest.settings:get("mapgen_rarity")) or 18,
 	mapgen_size = tonumber(minetest.settings:get("mapgen_size")) or 210,
+	disable_mapgen =  minetest.settings:get_bool("disable_mapgen"),
 }
 
 -- functions for dynamically changing settings