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Use VoxelManipulators for get_node_force.

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A VoxelManipulator, when asked to read a mapblock, in addition to making
that mapblock available to the caller, also pulls it into the server’s
map cache, thus making get_node calls in the immediate future succeed.

This has the dual advantages that not every mapblock containing a
Mesecons circuit need remain loaded at all times (rather mapblocks can
be loaded on demand as signals are sent), and that the server need not
bother running ABMs and ticking entities within those mapblocks that are
loaded due to Mesecons signalling.
This commit is contained in:
Christopher Head 2016-08-20 21:48:18 -07:00
parent 912f17f335
commit 564cee346a
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GPG Key ID: E3188720C4CCDD7E
1 changed files with 14 additions and 32 deletions
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42
mesecons/util.lua
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@ -236,43 +236,25 @@ local function unhash_blockpos(hash)
return vector.multiply(minetest.get_position_from_hash(hash), BLOCKSIZE)
end
mesecon.forceloaded_blocks = {}
-- get node and force-load area
function mesecon.get_node_force(pos)
local hash = hash_blockpos(pos)
if mesecon.forceloaded_blocks[hash] == nil then
-- if no more forceload spaces are available, try again next time
if minetest.forceload_block(pos) then
mesecon.forceloaded_blocks[hash] = 0
local node = minetest.get_node_or_nil(pos)
if node == nil then
-- Node is not currently loaded; use a VoxelManipulator to prime
-- the mapblock cache and try again.
minetest.get_voxel_manip(pos, pos)
node = minetest.get_node_or_nil(pos)
end
else
mesecon.forceloaded_blocks[hash] = 0
return node
end
return minetest.get_node_or_nil(pos)
end
minetest.register_globalstep(function (dtime)
for hash, time in pairs(mesecon.forceloaded_blocks) do
-- unload forceloaded blocks after 10 minutes without usage
if (time > mesecon.setting("forceload_timeout", 600)) then
-- Un-forceload any forceloaded mapblocks from older versions of Mesecons which
-- used forceloading instead of VoxelManipulators.
local old_forceloaded_blocks = mesecon.file2table("mesecon_forceloaded")
for hash, _ in pairs(old_forceloaded_blocks) do
minetest.forceload_free_block(unhash_blockpos(hash))
mesecon.forceloaded_blocks[hash] = nil
else
mesecon.forceloaded_blocks[hash] = time + dtime
end
end
end)
-- Store and read the forceloaded blocks to / from a file
-- so that those blocks are remembered when the game
-- is restarted
mesecon.forceloaded_blocks = mesecon.file2table("mesecon_forceloaded")
minetest.register_on_shutdown(function()
mesecon.table2file("mesecon_forceloaded", mesecon.forceloaded_blocks)
end)
os.remove(wpath..DIR_DELIM.."mesecon_forceloaded")
-- Autoconnect Hooks
-- Nodes like conductors may change their appearance and their connection rules