allow configuring the mapgen size, rarity and smooth without rejoining, which is actually a bad idea because of chunk corners

init.lua

@@ -52,7 +52,6 @@ local modpath = minetest.get_modpath("snow")
 dofile(modpath.."/src/abms.lua")
 dofile(modpath.."/src/aliases.lua")
 dofile(modpath.."/src/crafting.lua")
-dofile(modpath.."/src/snowball.lua")
 
 
 -- The formspec menu didn't work when util.lua was the very first "dofile" so I moved
@@ -60,6 +59,7 @@ dofile(modpath.."/src/snowball.lua")
 -- Minetest would crash if the mapgen was called upon before the rest of other snow lua files so
 -- I put it lower on the list and that seems to do the trick. ~ LazyJ
 dofile(modpath.."/src/util.lua")
+dofile(modpath.."/src/snowball.lua")
 -- To get Xmas tree saplings, the "christmas_content", true or false, in "util.lua" has to be determined first.
 -- That means "nodes.lua", where the saplings are controlled, has to come after "util.lua". ~ LazyJ
 dofile(modpath.."/src/nodes.lua")
@@ -79,6 +79,7 @@ and minetest.get_modpath("moreblocks") then
 
 end
 
+local is_uneven
 --This function places snow checking at the same time for snow level and increasing as needed.
 --This also takes into account sourrounding snow and makes snow even.
 function snow.place(pos)
@@ -94,7 +95,7 @@ function snow.place(pos)
 		local level = minetest.get_node_level(pos)
 		if level < 63 then
 			if minetest.get_item_group(minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z}).name, "leafdecay") == 0
-			and not snow.is_uneven(pos) then
+			and not is_uneven(pos) then
 				minetest.sound_play("default_snow_footstep", {pos=pos})
 				minetest.add_node_level(pos, 7)
 			end
@@ -136,7 +137,7 @@ end
 
 -- Checks if the snow level is even at any given pos.
 -- Smooth Snow
-local function is_uneven(pos)
+local function uneven(pos)
 	local num = minetest.get_node_level(pos)
 	local get_node = minetest.get_node
 	local add_node = minetest.add_node
@@ -181,8 +182,18 @@ local function is_uneven(pos)
 	end
 end
 
-function snow.is_uneven(pos)
 if snow.smooth_snow then
-		return is_uneven(pos)
+	is_uneven = uneven
+else
+	is_uneven = function() end
+end
+
+snow.register_on_configuring(function(name, v)
+	if name == "smooth_snow" then
+		if v then
+			is_uneven = uneven
+		else
+			is_uneven = function() end
 		end
 	end
+end)

src/falling_snow.lua

@@ -188,6 +188,7 @@ local function snow_fall(pos, player, animate)
 end
 
 -- Snow
+local lighter_snowfall = snow.lighter_snowfall
 local function calc_snowfall()
 	for _, player in pairs(minetest.get_connected_players()) do
 		local ppos = player:getpos()
@@ -196,7 +197,7 @@ local function calc_snowfall()
 		if get_snow(ppos)
 		and minetest.get_node_light(ppos, 0.5) == 15 then
 			local animate
-			if not snow.lighter_snowfall then
+			if not lighter_snowfall then
 				local vel = {x=0, y=-1, z=-1}
 				local acc = {x=0, y=0, z=0}
 				minetest.add_particlespawner(get_snow_particledef({
@@ -239,8 +240,25 @@ local function calc_snowfall()
 	end
 end
 
-minetest.register_globalstep(function(dtime)
+local step_func
+minetest.register_globalstep(function()
+	step_func()
+end)
+
 if snow.enable_snowfall then
-		calc_snowfall()
+	step_func = calc_snowfall
+else
+	step_func = function() end
+end
+
+snow.register_on_configuring(function(name, v)
+	if name == "enable_snowfall" then
+		if v then
+			step_func = calc_snowfall
+		else
+			step_func = function() end
+		end
+	elseif name == "lighter_snowfall" then
+		lighter_snowfall = v
 	end
 end)

src/mapgen.lua

@@ -23,12 +23,14 @@ end
 
 local rarity = snow.mapgen_rarity
 local size = snow.mapgen_size
+local smooth = snow.smooth_biomes
 
-local nosmooth_rarity = 1-rarity/50
+local nosmooth_rarity, perlin_scale
-local perlin_scale = size*100/rarity
+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
-local smooth = snow.smooth_biomes
 	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)
@@ -37,6 +39,22 @@ if smooth then
 	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
+	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.

src/mapgen_v6.lua

@@ -37,18 +37,6 @@ local np_ice = {
 }
 
 
--- Debugging function
-
-local biome_strings = {
-	{"snowy", "plain", "alpine", "normal", "normal"},
-	{"cool", "icebergs", "icesheet", "icecave", "icehole"}
-}
-local function biome_to_string(num,num2)
-	local biome = biome_strings[1][num] or "unknown "..num
-	return biome
-end
-
-
 local function do_ws_func(a, x)
 	local n = x/(16000)
 	local y = 0
@@ -120,7 +108,7 @@ local function is_snowable(id)
 end
 
 
-local c, replacements
+local c, replacements, mg_debug, biome_to_string
 local function define_contents()
 	c = {
 		dirt_with_grass = minetest.get_content_id("default:dirt_with_grass"),
@@ -145,6 +133,8 @@ local function define_contents()
 		desert_sand = minetest.get_content_id("default:desert_sand"),
 	}
 	replacements = snow.known_plants or {}
+
+	mg_debug = snow.debug
 end
 
 local smooth = snow.smooth_biomes
@@ -153,6 +143,31 @@ local smooth_rarity_min = mg.smooth_rarity_min
 local smooth_rarity_dif = mg.smooth_rarity_dif
 local nosmooth_rarity = mg.nosmooth_rarity
 
+snow.register_on_configuring(function(name, v)
+	if name == "debug" then
+		mg_debug = v
+	elseif name == "mapgen_rarity"
+	or name == "mapgen_size"
+	or name == "smooth_biomes" then
+		minetest.after(0, function()
+			smooth = snow.smooth_biomes
+			smooth_rarity_max = mg.smooth_rarity_max
+			smooth_rarity_min = mg.smooth_rarity_min
+			smooth_rarity_dif = mg.smooth_rarity_dif
+			nosmooth_rarity = mg.nosmooth_rarity
+			local scale = mg.perlin_scale
+			np_cold = {
+				offset = 0,
+				scale = 1,
+				spread = {x=scale, y=scale, z=scale},
+				seed = 112,
+				octaves = 3,
+				persist = 0.5
+			}
+		end)
+	end
+end)
+
 minetest.register_on_generated(function(minp, maxp, seed)
 	local t1 = os.clock()
 
@@ -509,9 +524,21 @@ minetest.register_on_generated(function(minp, maxp, seed)
 	vm:write_to_map()
 
 	if write_to_map
-	and snow.debug then -- print if any column of mapchunk was snow biome
+	and mg_debug then -- print if any column of mapchunk was snow biome
 		local biome_string = biome_to_string(biome)
 		local chugent = math.ceil((os.clock() - t1) * 1000)
 		print("[snow] "..biome_string.." x "..minp.x.." z "..minp.z.." time "..chugent.." ms")
 	end
 end)
+
+
+-- Debugging function
+
+local biome_strings = {
+	{"snowy", "plain", "alpine", "normal", "normal"},
+	{"cool", "icebergs", "icesheet", "icecave", "icehole"}
+}
+function biome_to_string(num,num2)
+	local biome = biome_strings[1][num] or "unknown "..num
+	return biome
+end

src/nodes.lua

@@ -36,14 +36,27 @@ The Xmas tree needles are registred and defined a farther down in this nodes.lua
 if snow.christmas_content then
 	table.insert(nodedef.drop.items, 1, {
 		-- player will get xmas tree with 1/120 chance
-		items = {'snow:xmas_tree'},
+		items = {"snow:xmas_tree"},
 		rarity = 120,
 	})
 end
 
 minetest.register_node("snow:needles", table.copy(nodedef))
 
-
+snow.register_on_configuring(function(name, v)
+	if name == "christmas_content" then
+		local drop = minetest.registered_nodes["snow:needles"].drop
+		if v then
+			table.insert(drop.items, 1, {
+				items = {"snow:xmas_tree"},
+				rarity = 120,
+			})
+		else
+			table.remove(drop.items, 1)
+		end
+		minetest.override_item("snow:needles", {drop = drop})
+	end
+end)
 
 
 

src/sled.lua

@@ -113,9 +113,8 @@ local function leave_sled(self, player)
 	player:get_inventory():add_item("main", "snow:sled")
 end
 
-function sled:on_rightclick(player)
+local function sled_rightclick(player)
-	if self.driver
+	if self.driver then
-	or not snow.sleds then
 		return
 	end
 	join_sled(self, player)
@@ -136,6 +135,27 @@ function sled:on_rightclick(player)
 -- End part 1
 end
 
+local on_sled_click
+if snow.sleds then
+	on_sled_click = sled_rightclick
+else
+	on_sled_click = function() end
+end
+
+snow.register_on_configuring(function(name, v)
+	if name == "sleds" then
+		if v then
+			on_sled_click = sled_rightclick
+		else
+			on_sled_click = function() end
+		end
+	end
+end)
+
+function sled:on_rightclick(player)
+	on_sled_click(player)
+end
+
 function sled:on_activate(staticdata, dtime_s)
 	self.object:set_armor_groups({immortal=1})
 	self.object:setacceleration({x=0, y=-10, z=0})

src/snowball.lua

@@ -8,9 +8,19 @@
 
 local creative_mode = minetest.setting_getbool("creative_mode")
 
+local snowball_velocity = snow.snowball_velocity
+local snowball_gravity = snow.snowball_gravity
+snow.register_on_configuring(function(name, v)
+	if name == "snowball_velocity" then
+		snowball_velocity = v
+	elseif name == "snowball_gravity" then
+		snowball_gravity = v
+	end
+end)
+
 local function get_gravity()
 	local grav = tonumber(minetest.setting_get("movement_gravity")) or 9.81
-	return grav*snow.snowball_gravity
+	return grav*snowball_gravity
 end
 
 local someone_throwing
@@ -25,7 +35,7 @@ local function snow_shoot_snowball(item, player)
 	addp.z = -dir.x/dif -- + (math.random()-0.5)/5
 	local pos = vector.add(player:getpos(), addp)
 	local obj = minetest.add_entity(pos, "snow:snowball_entity")
-	obj:setvelocity(vector.multiply(dir, snow.snowball_velocity))
+	obj:setvelocity(vector.multiply(dir, snowball_velocity))
 	obj:setacceleration({x=dir.x*-3, y=-get_gravity(), z=dir.z*-3})
 	if creative_mode then
 		if not someone_throwing then