Merge pull request 'Implementing slime mapblocks!' (#3551) from slime_chunk into master

Reviewed-on: MineClone2/MineClone2#3551
Reviewed-by: Nicu <kneekoo@noreply.git.minetest.land>

mods/ENTITIES/mcl_mobs/spawning.lua

@@ -542,7 +542,7 @@ function mcl_mobs:non_spawn_specific(mob_name,dimension,min_light,max_light)
 	}
 end
 
-function mcl_mobs:spawn_specific(name, dimension, type_of_spawning, biomes, min_light, max_light, interval, chance, aoc, min_height, max_height, day_toggle, on_spawn)
+function mcl_mobs:spawn_specific(name, dimension, type_of_spawning, biomes, min_light, max_light, interval, chance, aoc, min_height, max_height, day_toggle, on_spawn, check_position)
 
 	-- Do mobs spawn at all?
 	if not mobs_spawn then
@@ -579,6 +579,7 @@ function mcl_mobs:spawn_specific(name, dimension, type_of_spawning, biomes, min_
 	spawn_dictionary[key]["min_height"] = min_height
 	spawn_dictionary[key]["max_height"] = max_height
 	spawn_dictionary[key]["day_toggle"] = day_toggle
+	spawn_dictionary[key]["check_position"] = check_position
 
 	summary_chance = summary_chance + chance
 end
@@ -653,14 +654,17 @@ end
 
 
 local function spawn_check(pos, spawn_def)
-	if not spawn_def then return end
+	if not spawn_def or not pos then return end
+
 	dbg_spawn_attempts = dbg_spawn_attempts + 1
 	local dimension = mcl_worlds.pos_to_dimension(pos)
 	local mob_def = minetest.registered_entities[spawn_def.name]
 	local mob_type = mob_def.type
 	local gotten_node = get_node(pos).name
 	local gotten_biome = minetest.get_biome_data(pos)
+
 	if not gotten_node or not gotten_biome then return end
+
 	gotten_biome = get_biome_name(gotten_biome.biome) --makes it easier to work with
 
 	local is_ground = minetest.get_item_group(gotten_node,"solid") ~= 0
@@ -676,24 +680,37 @@ local function spawn_check(pos, spawn_def)
 	local is_bedrock  = gotten_node == "mcl_core:bedrock"
 	local is_grass = minetest.get_item_group(gotten_node,"grass_block") ~= 0
 
-	if pos and spawn_def
-	and pos.y >= spawn_def.min_height
-	and pos.y <= spawn_def.max_height
-	and spawn_def.dimension == dimension
-	and biome_check(spawn_def.biomes, gotten_biome)
-	and (is_ground or spawn_def.type_of_spawning ~= "ground")
-	and (spawn_def.type_of_spawning ~= "ground" or not is_leaf)
-	and has_room(mob_def,pos)
-	and (spawn_def.check_position and spawn_def.check_position(pos) or true)
-	and (not is_farm_animal(spawn_def.name) or is_grass)
-	and (spawn_def.type_of_spawning ~= "water" or is_water)
-	and ( not spawn_protected or not minetest.is_protected(pos, "") )
-	and not is_bedrock then
-		--only need to poll for node light if everything else worked
-		local gotten_light = get_node_light(pos)
-		if gotten_light >= spawn_def.min_light and gotten_light <= spawn_def.max_light then
-			return true
+	if pos.y >= spawn_def.min_height
+			and pos.y <= spawn_def.max_height
+			and spawn_def.dimension == dimension
+			and biome_check(spawn_def.biomes, gotten_biome) then
+
+		--mcl_log("Level 1 spawn check passed")
+		--minetest.log("Mob: " .. mob_def.name)
+
+		if  (is_ground or spawn_def.type_of_spawning ~= "ground")
+				and (spawn_def.type_of_spawning ~= "ground" or not is_leaf)
+				and (not is_farm_animal(spawn_def.name) or is_grass)
+				and (spawn_def.type_of_spawning ~= "water" or is_water)
+				and not is_bedrock
+				and has_room(mob_def,pos)
+				and (spawn_def.check_position and spawn_def.check_position(pos) or spawn_def.check_position == nil)
+				and ( not spawn_protected or not minetest.is_protected(pos, "") ) then
+
+			--mcl_log("Level 2 spawn check passed")
+
+			local gotten_light = get_node_light(pos)
+			if gotten_light >= spawn_def.min_light and gotten_light <= spawn_def.max_light then
+				--mcl_log("Level 3 spawn check passed")
+				return true
+			else
+				mcl_log("Spawn check level 3 failed")
+			end
+		else
+			mcl_log("Spawn check level 2 failed")
 		end
+	else
+		mcl_log("Spawn check level 1 failed")
 	end
 	return false
 end
@@ -1014,7 +1031,7 @@ if mobs_spawn then
 							end
 						end
 					else
-						mcl_log("Spawn check failed")
+						--mcl_log("Spawn check failed")
 					end
 				else
 					mcl_log("Cap space full")

mods/ENTITIES/mobs_mc/slime+magma_cube.lua

@@ -1,10 +1,111 @@
 --License for code WTFPL and otherwise stated in readmes
-
--- FIXME: Slimes should spawn only in "slime chunks" which make up only
--- 10% of the map.
---
 local S = minetest.get_translator("mobs_mc")
 
+local MAPBLOCK_SIZE = 16
+
+local seed = minetest.get_mapgen_setting("seed")
+
+local slime_chunk_match
+local x_modifier
+local z_modifier
+
+local function split_by_char (inputstr, sep, limit)
+	if sep == nil then
+		sep = "%d"
+	end
+	local t = {}
+
+	local i = 0
+	for str in string.gmatch(inputstr, "(["..sep.."])") do
+		i = i --+ 1
+		table.insert(t, tonumber(str))
+		if limit and i >= limit then
+			break
+		end
+	end
+	return t
+end
+
+--Seed: "16002933932875202103" == random seed
+--Seed: "1807191622654296300" == cheese
+--Seed: "1" = 1
+local function process_seed (seed)
+	--minetest.log("seed: " .. seed)
+
+	local split_chars = split_by_char(tostring(seed), nil, 10)
+
+	slime_chunk_match = split_chars[1]
+	x_modifier = split_chars[2]
+	z_modifier = split_chars[3]
+
+	--minetest.log("x_modifier: " .. tostring(x_modifier))
+	--minetest.log("z_modifier: " .. tostring(z_modifier))
+	--minetest.log("slime_chunk_match: " .. tostring(slime_chunk_match))
+end
+
+local processed = process_seed (seed)
+
+
+local function convert_to_chunk_value (co_ord, modifier)
+	local converted = math.floor(math.abs(co_ord) / MAPBLOCK_SIZE)
+
+	if modifier then
+		converted = (converted + modifier)
+	end
+	converted = converted % 10
+
+	--minetest.log("co_ord: " .. co_ord)
+	--minetest.log("converted: " .. converted)
+	return converted
+end
+
+assert(convert_to_chunk_value(-16) == 1, "Incorrect convert_to_chunk_value result")
+assert(convert_to_chunk_value(-15) == 0, "Incorrect convert_to_chunk_value result")
+assert(convert_to_chunk_value(-1) == 0, "Incorrect convert_to_chunk_value result")
+assert(convert_to_chunk_value(0) == 0, "Incorrect convert_to_chunk_value result")
+assert(convert_to_chunk_value(1) == 0, "Incorrect convert_to_chunk_value result")
+assert(convert_to_chunk_value(15) == 0, "Incorrect convert_to_chunk_value result")
+assert(convert_to_chunk_value(16) == 1, "Incorrect convert_to_chunk_value result")
+assert(convert_to_chunk_value(31) == 1, "Incorrect convert_to_chunk_value result")
+assert(convert_to_chunk_value(32) == 2, "Incorrect convert_to_chunk_value result")
+assert(convert_to_chunk_value(1599) == 9, "Incorrect convert_to_chunk_value result")
+assert(convert_to_chunk_value(1600) == 0, "Incorrect convert_to_chunk_value result")
+
+assert(convert_to_chunk_value(0,9) == 9, "Incorrect convert_to_chunk_value result")
+assert(convert_to_chunk_value(16,5) == 6, "Incorrect convert_to_chunk_value result")
+assert(convert_to_chunk_value(1599,4) == 3, "Incorrect convert_to_chunk_value result")
+
+local function calculate_chunk_value (pos, x_mod, z_mod)
+	local chunk_val = math.abs(convert_to_chunk_value(pos.x, x_mod) - convert_to_chunk_value(pos.z, z_mod)) % 10
+	return chunk_val
+end
+
+assert(calculate_chunk_value(vector.new(0,0,0)) == 0, "calculate_chunk_value failed")
+assert(calculate_chunk_value(vector.new(0,0,0), 1, 1) == 0, "calculate_chunk_value failed")
+assert(calculate_chunk_value(vector.new(0,0,0), 2, 1) == 1, "calculate_chunk_value failed")
+assert(calculate_chunk_value(vector.new(64,0,16)) == (4-1), "calculate_chunk_value failed")
+assert(calculate_chunk_value(vector.new(16,0,64)) == (3), "calculate_chunk_value failed")
+assert(calculate_chunk_value(vector.new(-160,0,-160)) == 0, "calculate_chunk_value failed")
+
+local function is_slime_chunk(pos)
+	if not pos then return end
+
+	local chunk_val = calculate_chunk_value (pos, x_modifier, z_modifier)
+	local slime_chunk = chunk_val == slime_chunk_match
+
+	--minetest.log("x: " ..pos.x ..  ", z:" .. pos.z)
+
+	--minetest.log("seed slime_chunk_match: " .. tostring(slime_chunk_match))
+	--minetest.log("chunk_val: " .. tostring(chunk_val))
+	--minetest.log("Is slime chunk: " .. tostring(slime_chunk))
+	return slime_chunk
+end
+
+local check_position = function (pos)
+	return is_slime_chunk(pos)
+end
+
+
 -- Returns a function that spawns children in a circle around pos.
 -- To be used as on_die callback.
 -- self: mob reference
@@ -212,7 +313,8 @@ minetest.LIGHT_MAX+1,
 12000,
 4,
 cave_min,
-cave_max)
+cave_max,
+nil, nil, check_position)
 
 mcl_mobs:spawn_specific(
 "mobs_mc:slime_tiny",
@@ -238,7 +340,8 @@ minetest.LIGHT_MAX+1,
 8500,
 4,
 cave_min,
-cave_max)
+cave_max,
+nil, nil, check_position)
 
 mcl_mobs:spawn_specific(
 "mobs_mc:slime_small",
@@ -264,7 +367,8 @@ minetest.LIGHT_MAX+1,
 10000,
 4,
 cave_min,
-cave_max)
+cave_max,
+nil, nil, check_position)
 
 mcl_mobs:spawn_specific(
 "mobs_mc:slime_big",
@@ -278,6 +382,7 @@ swamp_light_max,
 4,
 swamp_min,
 swamp_max)
+
 -- Magma cube
 local magma_cube_big = {
 	description = S("Magma Cube"),