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-- Prevent anyone else accessing those functions
local forceload_block = minetest.forceload_block
local forceload_free_block = minetest.forceload_free_block
minetest.forceload_block = nil
minetest.forceload_free_block = nil
local blocks_forceloaded
local total_forceloaded = 0
local BLOCKSIZE = 16
local function get_blockpos(pos)
return {
x = math.floor(pos.x/BLOCKSIZE),
y = math.floor(pos.y/BLOCKSIZE),
z = math.floor(pos.z/BLOCKSIZE)}
end
function minetest.forceload_block(pos)
local blockpos = get_blockpos(pos)
local hash = minetest.hash_node_position(blockpos)
if blocks_forceloaded[hash] ~= nil then
blocks_forceloaded[hash] = blocks_forceloaded[hash] + 1
return true
else
if total_forceloaded >= (tonumber(minetest.setting_get("max_forceloaded_blocks")) or 16) then
return false
end
total_forceloaded = total_forceloaded+1
blocks_forceloaded[hash] = 1
forceload_block(blockpos)
return true
end
end
function minetest.forceload_free_block(pos)
local blockpos = get_blockpos(pos)
local hash = minetest.hash_node_position(blockpos)
if blocks_forceloaded[hash] == nil then return end
if blocks_forceloaded[hash] > 1 then
blocks_forceloaded[hash] = blocks_forceloaded[hash] - 1
else
total_forceloaded = total_forceloaded-1
blocks_forceloaded[hash] = nil
forceload_free_block(blockpos)
end
end
-- Keep the forceloaded areas after restart
local wpath = minetest.get_worldpath()
local function read_file(filename)
local f = io.open(filename, "r")
if f==nil then return {} end
local t = f:read("*all")
f:close()
if t=="" or t==nil then return {} end
return minetest.deserialize(t)
end
local function write_file(filename, table)
local f = io.open(filename, "w")
f:write(minetest.serialize(table))
f:close()
end
blocks_forceloaded = read_file(wpath.."/force_loaded.txt")
for _, __ in pairs(blocks_forceloaded) do
total_forceloaded = total_forceloaded + 1
end
minetest.after(5, function()
for hash, _ in pairs(blocks_forceloaded) do
local blockpos = minetest.get_position_from_hash(hash)
forceload_block(blockpos)
end
end)
minetest.register_on_shutdown(function()
write_file(wpath.."/force_loaded.txt", blocks_forceloaded)
end)
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