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function digilines.addPosRule(p, r)
return {x = p.x + r.x, y = p.y + r.y, z = p.z + r.z}
end
function digilines.cmpPos(p1, p2)
return (p1.x == p2.x and p1.y == p2.y and p1.z == p2.z)
end
--Rules rotation Functions:
function digilines.rotate_rules_right(rules)
local nr={}
for i, rule in ipairs(rules) do
nr[i]={}
nr[i].z=rule.x
nr[i].x=-rule.z
nr[i].y=rule.y
end
return nr
end
function digilines.rotate_rules_left(rules)
local nr={}
for i, rule in ipairs(rules) do
nr[i]={}
nr[i].z=-rule.x
nr[i].x=rule.z
nr[i].y=rule.y
end
return nr
end
function digilines.rotate_rules_down(rules)
local nr={}
for i, rule in ipairs(rules) do
nr[i]={}
nr[i].y=rule.x
nr[i].x=-rule.y
nr[i].z=rule.z
end
return nr
end
function digilines.rotate_rules_up(rules)
local nr={}
for i, rule in ipairs(rules) do
nr[i]={}
nr[i].y=-rule.x
nr[i].x=rule.y
nr[i].z=rule.z
end
return nr
end
function digilines.tablecopy(table) -- deep table copy
if type(table) ~= "table" then return table end -- no need to copy
local newtable = {}
for idx, item in pairs(table) do
if type(item) == "table" then
newtable[idx] = digilines.tablecopy(item)
else
newtable[idx] = item
end
end
return newtable
end
-- VoxelManipulator-based node access functions:
-- Maps from a hashed mapblock position (as returned by hash_blockpos) to a
-- table.
--
-- Contents of the table are:
-- “va” → the VoxelArea
-- “data” → the data array
-- “param1” → the param1 array
-- “param2” → the param2 array
--
-- Nil if no bulk-VM operation is in progress.
local vm_cache = nil
-- Starts a bulk-VoxelManipulator operation.
--
-- During a bulk-VoxelManipulator operation, calls to get_node_force operate
-- directly on VM-loaded arrays, which should be faster for reading many nodes
-- in rapid succession. However, the cache must be flushed with vm_end once the
-- scan is finished, to avoid using stale data in future.
function digilines.vm_begin()
vm_cache = {}
end
-- Ends a bulk-VoxelManipulator operation, freeing the cached data.
function digilines.vm_end()
vm_cache = nil
end
-- The dimension of a mapblock in nodes.
local MAPBLOCKSIZE = 16
-- Converts a node position into a hash of a mapblock position.
local function vm_hash_blockpos(pos)
return minetest.hash_node_position({
x = math.floor(pos.x / MAPBLOCKSIZE),
y = math.floor(pos.y / MAPBLOCKSIZE),
z = math.floor(pos.z / MAPBLOCKSIZE)
})
end
-- Gets the cache entry covering a position, populating it if necessary.
local function vm_get_or_create_entry(pos)
local hash = vm_hash_blockpos(pos)
local tbl = vm_cache[hash]
if not tbl then
local vm = minetest.get_voxel_manip(pos, pos)
local min_pos, max_pos = vm:get_emerged_area()
local va = VoxelArea:new{MinEdge = min_pos, MaxEdge = max_pos}
tbl = {va = va, data = vm:get_data(), param1 = vm:get_light_data(), param2 = vm:get_param2_data()}
vm_cache[hash] = tbl
end
return tbl
end
-- Gets the node at a position during a bulk-VoxelManipulator operation.
local function vm_get_node(pos)
local tbl = vm_get_or_create_entry(pos)
local index = tbl.va:indexp(pos)
local node_value = tbl.data[index]
local node_param1 = tbl.param1[index]
local node_param2 = tbl.param2[index]
return {name = minetest.get_name_from_content_id(node_value), param1 = node_param1, param2 = node_param2}
end
-- Gets the node at a given position, regardless of whether it is loaded or
-- not.
--
-- Outside a bulk-VoxelManipulator operation, if the mapblock is not loaded, it
-- is pulled into the server’s main map data cache and then accessed from
-- there.
--
-- Inside a bulk-VoxelManipulator operation, the operation’s VM cache is used.
function digilines.get_node_force(pos)
if vm_cache then
return vm_get_node(pos)
end
local node = minetest.get_node(pos)
if node.name == "ignore" 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(pos)
end
return node
end
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