minetest_game/mods/spawn/init.lua

160 lines
3.5 KiB
Lua

-- spawn/init.lua
-- Disable by mapgen, setting or if 'static_spawnpoint' is set
--------------------------------------------------------------
local mg_name = minetest.get_mapgen_setting("mg_name")
if mg_name == "v6" or mg_name == "singlenode" or
minetest.settings:get("static_spawnpoint") or
minetest.settings:get_bool("engine_spawn") then
return
end
-- Parameters
-------------
-- Resolution of search grid in nodes.
local res = 64
-- Number of points checked in the square search grid (edge * edge).
local checks = 128 * 128
-- Starting point for biome checks. This also sets the y co-ordinate for all
-- points checked, so the suitable biomes must be active at this y.
local pos = {x = 0, y = 8, z = 0}
-- Table of suitable biomes
local biome_ids = {
minetest.get_biome_id("taiga"),
minetest.get_biome_id("coniferous_forest"),
minetest.get_biome_id("deciduous_forest"),
minetest.get_biome_id("grassland"),
minetest.get_biome_id("savanna"),
}
-- End of parameters
--------------------
-- Direction table
local dirs = {
{x = 0, y = 0, z = 1},
{x = -1, y = 0, z = 0},
{x = 0, y = 0, z = -1},
{x = 1, y = 0, z = 0},
}
-- Initial variables
local edge_len = 1
local edge_dist = 0
local dir_step = 0
local dir_ind = 1
local searched = false
local success = false
local spawn_pos = {}
-- Get world 'mapgen_limit' and 'chunksize' to calculate 'spawn_limit'.
-- This accounts for how mapchunks are not generated if they or their shell exceed
-- 'mapgen_limit'.
local mapgen_limit = tonumber(minetest.get_mapgen_setting("mapgen_limit"))
local chunksize = tonumber(minetest.get_mapgen_setting("chunksize"))
local spawn_limit = math.max(mapgen_limit - (chunksize + 1) * 16, 0)
--Functions
-----------
-- Get next position on square search spiral
local function next_pos()
if edge_dist == edge_len then
edge_dist = 0
dir_ind = dir_ind + 1
if dir_ind == 5 then
dir_ind = 1
end
dir_step = dir_step + 1
edge_len = math.floor(dir_step / 2) + 1
end
local dir = dirs[dir_ind]
local move = vector.multiply(dir, res)
edge_dist = edge_dist + 1
return vector.add(pos, move)
end
-- Spawn position search
local function search()
for iter = 1, checks do
local biome_data = minetest.get_biome_data(pos)
-- Sometimes biome_data is nil
local biome = biome_data and biome_data.biome
for id_ind = 1, #biome_ids do
local biome_id = biome_ids[id_ind]
if biome == biome_id then
local spawn_y = minetest.get_spawn_level(pos.x, pos.z)
if spawn_y then
spawn_pos = {x = pos.x, y = spawn_y, z = pos.z}
return true
end
end
end
pos = next_pos()
-- Check for position being outside world edge
if math.abs(pos.x) > spawn_limit or math.abs(pos.z) > spawn_limit then
return false
end
end
return false
end
-- On new player spawn and player respawn
-- Search for spawn position once per server session. If successful, store
-- position and reposition players, otherwise leave them at engine spawn
-- position.
local function on_spawn(player)
if not searched then
success = search()
searched = true
end
if success then
player:set_pos(spawn_pos)
end
end
minetest.register_on_newplayer(function(player)
on_spawn(player)
end)
local enable_bed_respawn = minetest.settings:get_bool("enable_bed_respawn")
if enable_bed_respawn == nil then
enable_bed_respawn = true
end
minetest.register_on_respawnplayer(function(player)
-- Avoid respawn conflict with beds mod
if beds and enable_bed_respawn and
beds.spawn[player:get_player_name()] then
return
end
on_spawn(player)
return true
end)