Remove not working mapgen settings and disable mapgen

Unfortunately there is no easy way to create very rare biomes in minetest.

README.md

@@ -2,17 +2,20 @@
 
 This mod adds mushrooms to minetest. The growing tool can make them giant.
 
-**Depends:** see [depends.txt](https://raw.githubusercontent.com/HybridDog/riesenpilz/master/depends.txt)  
-**License:** see [LICENSE.txt](https://raw.githubusercontent.com/HybridDog/riesenpilz/master/LICENSE.txt)  
-**Download:** [zip](https://github.com/HybridDog/riesenpilz/archive/master.zip), [tar.gz](https://github.com/HybridDog/riesenpilz/archive/master.tar.gz)  
+**Depends:** see [depends.txt](https://raw.githubusercontent.com/HybridDog/riesenpilz/master/depends.txt)<br/>
+**License:** see [LICENSE.txt](https://raw.githubusercontent.com/HybridDog/riesenpilz/master/LICENSE.txt)<br/>
+**Download:** [zip](https://github.com/HybridDog/riesenpilz/archive/master.zip), [tar.gz](https://github.com/HybridDog/riesenpilz/archive/master.tar.gz)<br/>
 
 ![I'm a screenshot!](https://cloud.githubusercontent.com/assets/3192173/5332059/421c735a-7e47-11e4-88cc-b9ed90b659a8.png)
 
 If you got ideas or found bugs, please tell them to me.
 
 
-TODO:  
-— add more giant mushrooms  
-— finish supporting the mushrooms mod  
-— add lava suit  
-— eating must become possible
+TODO:
+* add more giant mushrooms
+* finish supporting the mushrooms mod
+* add lava suit
+* use visual_scale → crop textures and change nodeboxes (maybe automatically)
+* make the growingtool craftable
+* mapgen: do not use fixed tree stuff
+* add settingtypes.txt

depends.txt

@@ -1,3 +1,5 @@
 default
 vector_extras
+digilines?
 fence_registration?
+technic?

init.lua

@@ -17,8 +17,55 @@ local function r_area(manip, width, height, pos)
 	return VoxelArea:new({MinEdge=emerged_pos1, MaxEdge=emerged_pos2})
 end
 
-local function set_vm_data(manip, nodes, pos, t1, name)
-	manip:set_data(nodes)
+-- contents become added later
+local c
+
+-- cache buildable_to ids
+local re_al_cache = {[minetest.get_content_id("ignore")] = true}
+local function replacing_allowed(id)
+	if re_al_cache[id] ~= nil then
+		return re_al_cache[id]
+	end
+	local def = minetest.registered_nodes[minetest.get_name_from_content_id(id)]
+	if not def
+	or def.buildable_to then
+		re_al_cache[id] = true
+		return true
+	end
+	re_al_cache[id] = false
+	return false
+end
+
+local set_vm_nodes
+if riesenpilz.giant_restrict_area then
+	function set_vm_nodes(manip, pznodes)
+		local nodes = manip:get_data()
+		for vi,id in pairs(pznodes) do
+			if not replacing_allowed(nodes[vi]) then
+				return false
+			end
+			nodes[vi] = id
+		end
+		manip:set_data(nodes)
+		return true
+	end
+else
+	function set_vm_nodes(manip, pznodes)
+		local nodes = manip:get_data()
+		for vi,id in pairs(pznodes) do
+			if replacing_allowed(nodes[vi]) then
+				nodes[vi] = id
+			end
+		end
+		manip:set_data(nodes)
+		return true
+	end
+end
+
+local function set_vm_data(manip, pznodes, pos, t1, name)
+	if not set_vm_nodes(manip, pznodes) then
+		return
+	end
 	manip:write_to_map()
 	riesenpilz.inform("a giant "..name.." mushroom grew at "..vector.pos_to_string(pos), 3, t1)
 	local t1 = os.clock()
@@ -27,9 +74,6 @@ local function set_vm_data(manip, nodes, pos, t1, name)
 end
 
 
--- contents become added later
-local c
-
 function riesenpilz.red(pos, nodes, area, w)
 	local w = w or math.random(MAX_SIZE)
 	local h = w+2
@@ -61,11 +105,11 @@ local function riesenpilz_hybridpilz(pos)
 
 	local manip = minetest.get_voxel_manip()
 	local area = r_area(manip, w+1, w+3, pos)
-	local nodes = manip:get_data()
 
-	riesenpilz.red(pos, nodes, area, w)
+	local pznodes = {}
+	riesenpilz.red(pos, pznodes, area, w)
 
-	set_vm_data(manip, nodes, pos, t1, "red")
+	set_vm_data(manip, pznodes, pos, t1, "red")
 end
 
 
@@ -96,11 +140,11 @@ local function riesenpilz_brauner_minecraftpilz(pos)
 
 	local manip = minetest.get_voxel_manip()
 	local area = r_area(manip, br+1, br+3, pos)
-	local nodes = manip:get_data()
 
-	riesenpilz.brown(pos, nodes, area, br)
+	local pznodes = {}
+	riesenpilz.brown(pos, pznodes, area, br)
 
-	set_vm_data(manip, nodes, pos, t1, "brown")
+	set_vm_data(manip, pznodes, pos, t1, "brown")
 end
 
 
@@ -136,12 +180,14 @@ local function riesenpilz_minecraft_fliegenpilz(pos)
 
 	local manip = minetest.get_voxel_manip()
 	local area = r_area(manip, 2, 4, pos)
-	local nodes = manip:get_data()
 	local param2s = manip:get_param2_data()
 
-	riesenpilz.fly_agaric(pos, nodes, area, param2s)
+	local pznodes = {}
+	riesenpilz.fly_agaric(pos, pznodes, area, param2s)
 
-	manip:set_data(nodes)
+	if not set_vm_nodes(manip, pznodes) then
+		return
+	end
 	manip:set_param2_data(param2s)
 	manip:write_to_map()
 	manip:update_map()
@@ -217,11 +263,11 @@ local function riesenpilz_lavashroom(pos)
 
 	local manip = minetest.get_voxel_manip()
 	local area = r_area(manip, 4, h+6, pos)
-	local nodes = manip:get_data()
 
-	riesenpilz.lavashroom(pos, nodes, area, h)
+	local pznodes = {}
+	riesenpilz.lavashroom(pos, pznodes, area, h)
 
-	set_vm_data(manip, nodes, pos, t1, "lavashroom")
+	set_vm_data(manip, pznodes, pos, t1, "lavashroom")
 end
 
 
@@ -266,11 +312,11 @@ local function riesenpilz_glowshroom(pos)
 
 	local manip = minetest.get_voxel_manip()
 	local area = r_area(manip, 2, h+3, pos)
-	local nodes = manip:get_data()
 
-	riesenpilz.glowshroom(pos, nodes, area, h)
+	local pznodes = {}
+	riesenpilz.glowshroom(pos, pznodes, area, h)
 
-	set_vm_data(manip, nodes, pos, t1, "glowshroom")
+	set_vm_data(manip, pznodes, pos, t1, "glowshroom")
 end
 
 
@@ -320,11 +366,11 @@ local function riesenpilz_parasol(pos)
 
 	local manip = minetest.get_voxel_manip()
 	local area = r_area(manip, w, h, pos)
-	local nodes = manip:get_data()
 
-	riesenpilz.parasol(pos, nodes, area, w, h)
+	local pznodes = {}
+	riesenpilz.parasol(pos, pznodes, area, w, h)
 
-	set_vm_data(manip, nodes, pos, t1, "parasol")
+	set_vm_data(manip, pznodes, pos, t1, "parasol")
 end
 
 
@@ -400,11 +446,11 @@ local function riesenpilz_red45(pos)
 
 	local manip = minetest.get_voxel_manip()
 	local area = r_area(manip, 3, h, pos)
-	local nodes = manip:get_data()
 
-	riesenpilz.red45(pos, nodes, area, h1, h2)
+	local pznodes = {}
+	riesenpilz.red45(pos, pznodes, area, h1, h2)
 
-	set_vm_data(manip, nodes, pos, t1, "red45")
+	set_vm_data(manip, pznodes, pos, t1, "red45")
 end
 
 
@@ -430,16 +476,16 @@ function riesenpilz.apple(pos, nodes, area)
 		nodes[area:index(pos.x, pos.y+i, pos.z)] = c.tree
 	end
 
-	local c = pos.y+1
+	local d = pos.y+1
 	for i = -3,1,1 do
-		nodes[area:index(pos.x+i, c, pos.z+1)] = c.brown
+		nodes[area:index(pos.x+i, d, pos.z+1)] = c.brown
 	end
 	for i = 0,1,1 do
-		nodes[area:index(pos.x+i+1, c, pos.z-1-i)] = c.brown
-		nodes[area:index(pos.x+i+2, c, pos.z-1-i)] = c.brown
+		nodes[area:index(pos.x+i+1, d, pos.z-1-i)] = c.brown
+		nodes[area:index(pos.x+i+2, d, pos.z-1-i)] = c.brown
 	end
-	nodes[area:index(pos.x+1, c, pos.z)] = c.brown
-	nodes[area:index(pos.x-3, c+1, pos.z+1)] = c.brown
+	nodes[area:index(pos.x+1, d, pos.z)] = c.brown
+	nodes[area:index(pos.x-3, d+1, pos.z+1)] = c.brown
 end
 
 local function riesenpilz_apple(pos)
@@ -447,11 +493,13 @@ local function riesenpilz_apple(pos)
 	local t1 = os.clock()
 	local manip = minetest.get_voxel_manip()
 	local area = r_area(manip, 5, 14, pos)
-	local nodes = manip:get_data()
 
-	riesenpilz.apple(pos, nodes, area)
+	local pznodes = {}
+	riesenpilz.apple(pos, pznodes, area)
 
-	manip:set_data(nodes)
+	if not set_vm_nodes(manip, pznodes) then
+		return
+	end
 	manip:write_to_map()
 	riesenpilz.inform("an apple grew at "..vector.pos_to_string(pos), 3, t1)
 	manip:update_map()
@@ -506,6 +554,7 @@ for name,i in pairs({
 			interval = 100,
 			chance = 18,
 		},
+		hp = 2,
 	},
 	red = {
 		description = "red mushroom",
@@ -524,6 +573,7 @@ for name,i in pairs({
 			interval = 50,
 			chance = 30,
 		},
+		hp = -2,
 	},
 	fly_agaric = {
 		description = "fly agaric",
@@ -540,6 +590,7 @@ for name,i in pairs({
 			interval = 101,
 			chance = 30,
 		},
+		hp = -6,
 	},
 	lavashroom = {
 		description = "Lavashroom",
@@ -557,6 +608,7 @@ for name,i in pairs({
 			interval = 1010,
 			chance = 60,
 		},
+		hp = -1,
 	},
 	glowshroom = {
 		description = "Glowshroom",
@@ -577,6 +629,7 @@ for name,i in pairs({
 			interval = 710,
 			chance = 320,
 		},
+		hp = -2,
 	},
 	nether_shroom = {
 		description = "Nether mushroom",
@@ -590,6 +643,7 @@ for name,i in pairs({
 			{ 2/16, -1/16, -2/16, 4/16,  1/16, 2/16}
 		},
 		burntime = 6,
+		hp = -3,
 	},
 	parasol = {
 		description = "white parasol mushroom",
@@ -608,6 +662,7 @@ for name,i in pairs({
 			interval = 51,
 			chance = 36,
 		},
+		hp = 3,
 	},
 	red45 = {
 		description = "45 red mushroom",
@@ -627,6 +682,7 @@ for name,i in pairs({
 			interval = 1000,
 			chance = 180,
 		},
+		hp = 1,
 	},
 	brown45 = {
 		description = "45 brown mushroom",
@@ -645,6 +701,7 @@ for name,i in pairs({
 			interval = 100,
 			chance = 20,
 		},
+		hp = 1,
 	},
 }) do
 	local burntime = i.burntime or 1
@@ -655,7 +712,14 @@ for name,i in pairs({
 	local nd = "riesenpilz:"..name
 	minetest.register_node(nd, {
 		description = i.description,
-		tiles = {"riesenpilz_"..name.."_top.png", "riesenpilz_"..name.."_bottom.png", "riesenpilz_"..name.."_side.png"},
+		tiles = {
+			--~ {name = "riesenpilz_"..name.."_top.png", tileable_vertical = false},
+			--~ {name = "riesenpilz_"..name.."_bottom.png", tileable_vertical = false},
+			--~ {name = "riesenpilz_"..name.."_side.png", tileable_vertical = false},
+			"riesenpilz_"..name.."_top.png",
+			"riesenpilz_"..name.."_bottom.png",
+			"riesenpilz_"..name.."_side.png",
+		},
 		inventory_image = "riesenpilz_"..name.."_side.png",
 		walkable = false,
 		buildable_to = true,
@@ -665,7 +729,8 @@ for name,i in pairs({
 		sounds =  default.node_sound_leaves_defaults(),
 		node_box = box,
 		selection_box = box,
-		furnace_burntime = burntime
+		furnace_burntime = burntime,
+		on_secondary_use = minetest.item_eat(i.hp),
 	})
 
 	local g = i.growing
@@ -705,6 +770,7 @@ for name,i in pairs({
 			neighbors = g.neighbours,
 			interval = g.interval,
 			chance = g.chance,
+			catch_up = false,
 			action = function(pos, node)
 				if not abm_allowed then
 					return
@@ -745,7 +811,7 @@ for name,i in pairs({
 			-- should disallow lag
 				abm_allowed = false
 				minetest.after(2, function() abm_allowed = true end)
-				table.insert(disallowed_ps, pos)
+				disallowed_ps[#disallowed_ps+1] = pos
 
 			-- witch circles
 				local ps = {}
@@ -785,7 +851,7 @@ for name,i in pairs({
 										local light = minetest.get_node_light(pos, 0.5)
 										if light >= lmin
 										and light <= lmax then
-											table.insert(ps, pos)
+											ps[#ps+1] = pos
 										end
 									end
 								end
@@ -1038,37 +1104,83 @@ minetest.register_tool("riesenpilz:growingtool", {
 	inventory_image = "riesenpilz_growingtool.png",
 })
 
+local grow_functions = {
+	["riesenpilz:red"] = riesenpilz_hybridpilz,
+	["riesenpilz:fly_agaric"] = riesenpilz_minecraft_fliegenpilz,
+	["riesenpilz:brown"] = riesenpilz_brauner_minecraftpilz,
+	["riesenpilz:lavashroom"] = riesenpilz_lavashroom,
+	["riesenpilz:glowshroom"] = riesenpilz_glowshroom,
+	["riesenpilz:parasol"] = riesenpilz_parasol,
+	["riesenpilz:red45"] = riesenpilz_red45,
+	["default:apple"] = riesenpilz_apple
+}
+local function get_grow(name)
+	if grow_functions[name] then
+		return grow_functions[name]
+	end
+
+	local is = {}
+	for i = 1,#minetest.registered_abms do
+		local ad = minetest.registered_abms[i]
+		if ad.chance > 1
+		and table.indexof(ad.nodenames, name) ~= -1 then
+			is[#is+1] = ad.action
+		end
+	end
+
+	local func
+	if is[1] then
+		function func(pos, node)
+			for i = 1,#is do
+				is[i](pos, node)
+			end
+		end
+	else
+		local def = minetest.registered_nodes[name]
+		if def then
+			if def.on_timer then
+				func = def.on_timer
+			else
+				func = function(pos, node, player)
+					if def.on_place then
+						def.on_place(ItemStack(name), player, {
+							type = "node",
+							under = vector.new(pos),--{x=pos.x, y=pos.y-1, z=pos.z},
+							above = vector.new(pos)
+						})
+					end
+					if def.after_place_node then
+						def.after_place_node(pos)
+					end
+				end
+			end
+		else
+			func = function() end
+		end
+	end
+
+	grow_functions[name] = func
+	return func
+end
+
 minetest.register_on_punchnode(function(pos, node, player)
 	if player:get_wielded_item():get_name() ~= "riesenpilz:growingtool"
 	or minetest.is_protected(pos, player:get_player_name()) then
 		return
 	end
 
-	local name = node.name
-	if name == "riesenpilz:red" then
-		riesenpilz_hybridpilz(pos)
-	elseif name == "riesenpilz:fly_agaric" then
-		riesenpilz_minecraft_fliegenpilz(pos)
-	elseif name == "riesenpilz:brown" then
-		riesenpilz_brauner_minecraftpilz(pos)
-	elseif name == "riesenpilz:lavashroom" then
-		riesenpilz_lavashroom(pos)
-	elseif name == "riesenpilz:glowshroom" then
-		riesenpilz_glowshroom(pos)
-	elseif name == "riesenpilz:parasol" then
-		riesenpilz_parasol(pos)
-	elseif name == "riesenpilz:red45" then
-		riesenpilz_red45(pos)
-	elseif name == "default:apple" then
-		riesenpilz_apple(pos)
+	local func = get_grow(node.name)
+	if func then
+		func(pos, node, player)
 	end
 end)
 
 
 
--- Food
+-- Uses
 
 
+-- mush45's meal
 minetest.register_craftitem("riesenpilz:mush45_meal", {
 	description = "Mushroom Meal",
 	inventory_image = "riesenpilz_mush45_meal.png",
@@ -1084,6 +1196,54 @@ minetest.register_craft({
 })
 
 
+--[[ unfinished
+if minetest.global_exists(technic) then
+	if minetest.global_exists(digilines) then
+		-- digiline light value detector
+		minetest.register_node("riesenpilz:light_detector" {
+			tiles = {"riesenpilz_light_detector.png"},
+			paramtype = "light",
+			digiline = {
+				receive = function(pos)
+					local light = minetest.get_node_light(pos)
+					send("light_detector", light)
+				end,
+			},
+			--sounds = ,
+		})
+
+		--technic.comp({"riesenpilz:glowshroom 10", "coal"}, "riesenpilz:light_detector")
+	end
+
+
+	--[ [
+	if minetest.global_exists(3darmor) then add to depends
+		--lavashroom skin armor, swimming in lava possible
+
+		minetest.register_craftitem("riesenpilz:lavashroom_flesh", {
+			description = "lavashroom's flesh",
+			inventory_image = "riesenpilz_lavashroom_flesh.png",
+			on_use = minetest.item_eat(3),
+		})
+
+		minetest.register_craftitem("riesenpilz:lavashroom_skin", {
+			description = "lavashroom's skin",
+			inventory_image = "riesenpilz_lavashroom_skin.png",
+		})
+
+		minetest.register_craftitem("riesenpilz:antilava_plate", {
+			description = "lava protecting plate",
+			inventory_image = "riesenpilz_antilava_plate.png",
+		})
+
+		technic.centri("riesenpilz:lavashroom", {"riesenpilz:lavashroom_flesh", "riesenpilz:lavashroom_skin"})
+		technic.comp("riesenpilz:lavashroom_skin 5", "riesenpilz:antilava_plate")
+
+		armor_register(plate blah)
+	end--] ]
+})
+end--]]
+
 
 if riesenpilz.enable_mapgen then
 	dofile(modpath.."mapgen.lua")

mapgen.lua

@@ -6,6 +6,7 @@ local function define_contents()
 		ignore = minetest.get_content_id("ignore"),
 		air = minetest.get_content_id("air"),
 
+		water = minetest.get_content_id("default:water_source"),
 		stone = minetest.get_content_id("default:stone"),
 		dirt = minetest.get_content_id("default:dirt"),
 		desert_sand = minetest.get_content_id("default:desert_sand"),
@@ -20,7 +21,6 @@ local function define_contents()
 		riesenpilz_glowshroom = minetest.get_content_id("riesenpilz:glowshroom"),
 		riesenpilz_parasol = minetest.get_content_id("riesenpilz:parasol"),
 
-		GROUND = {},
 		TREE_STUFF = {
 			minetest.get_content_id("default:tree"),
 			minetest.get_content_id("default:leaves"),
@@ -29,74 +29,75 @@ local function define_contents()
 			minetest.get_content_id("default:jungleleaves"),
 			minetest.get_content_id("default:junglegrass"),
 		},
-		USUAL_STUFF = {
-			minetest.get_content_id("default:cactus"),
-			minetest.get_content_id("default:papyrus"),
-		},
 	}
-	for name,data in pairs(minetest.registered_nodes) do
-		local groups = data.groups
-		if groups then
-			if groups.crumbly == 3
-			or groups.soil == 1 then
-				table.insert(c.GROUND, minetest.get_content_id(name))
-			end
-		end
-	end
 end
 
 
-local function find_ground(a,list)
-	for i = 1,#list do
-		if a == list[i] then
-			return true
-		end
+local grounds = {}
+function is_ground(id)
+	local is = grounds[id]
+	if is ~= nil then
+		return is
 	end
+	local data = minetest.registered_nodes[minetest.get_name_from_content_id(id)]
+	if not data
+	or data.paramtype == "light" then
+		grounds[id] = false
+		return false
+	end
+	local groups = data.groups
+	if groups
+	and (groups.crumbly == 3 or groups.soil == 1) then
+		grounds[id] = true
+		return true
+	end
+	grounds[id] = false
+	return false
+end
+
+local toremoves = {}
+function is_toremove(id)
+	local is = toremoves[id]
+	if is ~= nil then
+		return is
+	end
+	local data = minetest.registered_nodes[minetest.get_name_from_content_id(id)]
+	if not data then
+		toremoves[id] = false
+		return false
+	end
+	local groups = data.groups
+	if groups
+	and groups.flammable then
+		toremoves[id] = true
+		return true
+	end
+	toremoves[id] = false
 	return false
 end
 
 
-local data, area
+local data = {}
+local area, pr
 function riesenpilz_circle(nam, pos, radius, chance)
-	for _,p in pairs(vector.circle(radius)) do
-		if pr:next(1,chance) == 1 then
-			local p = vector.add(pos, p)
-			local p_p = area:indexp(p)
-			if (data[p_p] == c.air or data[p_p] == c.ignore)
-			and find_ground(data[area:index(p.x, p.y-1, p.z)], c.GROUND) then
-				data[p_p] = nam
+	local circle = vector.circle(radius)
+	for i = 1,#circle do
+		if pr:next(1, chance) == 1 then
+			local vi = area:indexp(vector.add(pos, circle[i]))
+			if data[vi] == c.air
+			and is_ground(data[vi - area.ystride]) then
+				data[vi] = nam
 			end
 		end
 	end
 end
 
-local function say_info(info)
-	local info = "[riesenpilz] "..info
-	print(info)
-	minetest.chat_send_all(info)
-end
 
--- 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 = riesenpilz.mapgen_rarity
-local riesenpilz_size = riesenpilz.mapgen_size
-
-local nosmooth_rarity = 1-rarity/50
-local perlin_scale = riesenpilz_size*100/rarity
-local smooth_rarity_max, smooth_rarity_min, smooth_rarity_dif
-local smooth = riesenpilz.smooth
-if smooth then
-	local smooth_trans_size = riesenpilz.smooth_trans_size
-	smooth_rarity_max = upper_rarity(nosmooth_rarity+smooth_trans_size*2/perlin_scale)
-	smooth_rarity_min = upper_rarity(nosmooth_rarity-smooth_trans_size/perlin_scale)
-	smooth_rarity_dif = smooth_rarity_max-smooth_rarity_min
-end
-nosmooth_rarity = upper_rarity(nosmooth_rarity)
-
---local USUAL_STUFF =	{"default:leaves","default:apple","default:tree","default:cactus","default:papyrus"}
+local nosmooth_rarity = 0.5
+local smooth_rarity_max = 0.6
+local smooth_rarity_min = 0.4
+local smooth_rarity_dif = smooth_rarity_max - smooth_rarity_min
+local perlin_scale = 500
 
 local contents_defined
 minetest.register_on_generated(function(minp, maxp, seed)
@@ -141,9 +142,10 @@ minetest.register_on_generated(function(minp, maxp, seed)
 
 	local heightmap = minetest.get_mapgen_object("heightmap")
 	local hmi = 1
+	local hm_zstride = divs+1
 
 	local vm, emin, emax = minetest.get_mapgen_object("voxelmanip")
-	data = vm:get_data()
+	vm:get_data(data)
 	area = VoxelArea:new{MinEdge=emin, MaxEdge=emax}
 
 	for p_pos in area:iterp(minp, maxp) do	--remove tree stuff
@@ -180,51 +182,54 @@ minetest.register_on_generated(function(minp, maxp, seed)
 
 			if in_biome then
 
-				local ymin = math.max(heightmap[hmi]-5, minp.y) -- -1
+				local ymin = math.max(heightmap[hmi]-5, minp.y)
+				local ymax = math.min(heightmap[hmi]+20, maxp.y)
 
 				-- skip the air part
 				local ground
-				for y = math.min(heightmap[hmi]+20, maxp.y),ymin,-1 do
-					if data[area:index(x, y, z)] ~= c.air then
+				local vi = area:index(x, ymax, z)
+				for y = ymax, ymin, -1 do
+					if data[vi] ~= c.air then
 						ground = y
 						break
 					end
+					vi = vi - area.ystride
 				end
 
 				local ground_y
 				if ground then
-					for y = ground,ymin,-1 do
-						local p_pos = area:index(x, y, z)
-						local d_p_pos = data[p_pos]
-						for _,nam in pairs(c.USUAL_STUFF) do --remove usual stuff
-							if d_p_pos == nam then
-								data[p_pos] = c.air
-								p_pos = nil
-								break
+					for y = ground, ymin, -1 do
+						local d_p_pos = data[vi]
+						if is_toremove(d_p_pos) then
+							-- remove trees etc.
+							data[vi] = c.air
+						else
+							if is_ground(d_p_pos) then
+								ground_y = y
+								heightmap[hmi] = y
 							end
-						end
-						if p_pos --else search ground_y
-						and find_ground(d_p_pos, c.GROUND) then
-							ground_y = y
 							break
 						end
+						vi = vi - area.ystride
 					end
 				end
 
 				if ground_y then
-					data[area:index(x, ground_y, z)] = c.ground
+					-- add ground and dirt below if needed
+					data[vi] = c.ground
 					for i = -1,-5,-1 do
-						local p_pos = area:index(x, ground_y+i, z)
-						if data[p_pos] == c.desert_sand then
-							data[p_pos] = c.dirt
-						else
+						local p_pos = vi + i * area.ystride
+						if not is_ground(data[p_pos])
+						or data[p_pos] == c.dirt then
 							break
 						end
+						data[p_pos] = c.dirt
 					end
+
 					local bigtype
 					local boden = {x=x,y=ground_y+1,z=z}
 					if pr:next(1,15) == 1 then
-						data[area:index(x, ground_y+1, z)] = c.dry_shrub
+						data[vi + area.ystride] = c.dry_shrub
 					elseif pr:next(1,80) == 1 then
 						riesenpilz_circle(c.riesenpilz_brown, boden, pr:next(3,4), 3)
 					elseif pr:next(1,85) == 1 then
@@ -268,22 +273,51 @@ minetest.register_on_generated(function(minp, maxp, seed)
 		local t2 = os.clock()
 		for _,v in pairs(tab) do
 			local p = v[2]
-			local m = v[1]
-			if m == 1 then
-				riesenpilz.red(p, data, area)
-			elseif m == 2 then
-				riesenpilz.brown(p, data, area)
-			elseif m == 3 then
-				if not param2s then
-					param2s = vm:get_param2_data()
+
+			-- simple test for the distance to the biome border
+			local found_border = false
+			local dist = 5
+			local xmin = math.max(minp.x, p.x - dist)
+			local xmax = math.min(maxp.x, p.x + dist)
+			local hm_vi = (p.z - minp.z) * hm_zstride + xmin - minp.x + 1
+			for _ = xmin, xmax do
+				if not heightmap[hm_vi] then
+					found_border = true
+					break
+				end
+				hm_vi = hm_vi+1
+			end
+			if not found_border then
+				local zmin = math.max(minp.z, p.z - dist)
+				local zmax = math.min(maxp.z, p.z + dist)
+				hm_vi = (zmin - minp.z) * hm_zstride + p.x - minp.x + 1
+				for _ = zmin, zmax do
+					if not heightmap[hm_vi] then
+						found_border = true
+						break
+					end
+					hm_vi = hm_vi + hm_zstride
+				end
+			end
+
+			if not found_border then
+				local m = v[1]
+				if m == 1 then
+					riesenpilz.red(p, data, area)
+				elseif m == 2 then
+					riesenpilz.brown(p, data, area)
+				elseif m == 3 then
+					if not param2s then
+						param2s = vm:get_param2_data()
+					end
+					riesenpilz.fly_agaric(p, data, area, param2s)
+				elseif m == 4 then
+					riesenpilz.lavashroom(p, data, area)
+				elseif m == 5 then
+					riesenpilz.parasol(p, data, area)
+				elseif m == 6 then
+					riesenpilz.red45(p, data, area)
 				end
-				riesenpilz.fly_agaric(p, data, area, param2s)
-			elseif m == 4 then
-				riesenpilz.lavashroom(p, data, area)
-			elseif m == 5 then
-				riesenpilz.parasol(p, data, area)
-			elseif m == 6 then
-				riesenpilz.red45(p, data, area)
 			end
 		end
 		riesenpilz.inform("giant shrooms generated", 2, t2)
@@ -297,7 +331,6 @@ minetest.register_on_generated(function(minp, maxp, seed)
 	vm:set_lighting({day=0, night=0})
 	vm:calc_lighting()
 	vm:write_to_map()
-	data = nil
 	area = nil
 	riesenpilz.inform("data set", 2, t2)
 

settings.lua

@@ -1,6 +1,7 @@
 --This file contains configuration options for riesenpilz mod.
 
-riesenpilz.enable_mapgen = true
+-- mapgen size etc. does not work
+riesenpilz.enable_mapgen = false
 
 --Generate giant mushroom biomes everywhere
 riesenpilz.always_generate = false
@@ -8,15 +9,6 @@ riesenpilz.always_generate = false
 --Enables smooth transition of biomes.
 riesenpilz.smooth = true
 
---rarity in %
-riesenpilz.mapgen_rarity = 0.4
-
---size of the generated... (has an effect to the rarity, too)
-riesenpilz.mapgen_size = 200
-
---approximate size of smooth transitions
-riesenpilz.smooth_trans_size = 2
-
 --says some information.
 riesenpilz.info = true
 
@@ -28,3 +20,6 @@ riesenpilz.max_spam = 2
 
 --3d apple
 riesenpilz.change_apple = true
+
+--disallows growing a mushroom if it not every node would have a free place
+riesenpilz.giant_restrict_area = false