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-- Minetest: builtin/misc_s.lua
-- The distinction of what goes here is a bit tricky, basically it's everything
-- that does not (directly or indirectly) need access to ServerEnvironment,
-- Server or writable access to IGameDef on the engine side.
-- (The '_s' stands for standalone.)
--
-- Misc. API functions
--
function core.hash_node_position(pos)
return (pos.z + 32768) * 65536 * 65536
+ (pos.y + 32768) * 65536
+ pos.x + 32768
end
function core.get_position_from_hash(hash)
local x = (hash % 65536) - 32768
hash = math.floor(hash / 65536)
local y = (hash % 65536) - 32768
hash = math.floor(hash / 65536)
local z = (hash % 65536) - 32768
return vector.new(x, y, z)
end
function core.get_item_group(name, group)
if not core.registered_items[name] or not
core.registered_items[name].groups[group] then
return 0
end
return core.registered_items[name].groups[group]
end
function core.get_node_group(name, group)
core.log("deprecated", "Deprecated usage of get_node_group, use get_item_group instead")
return core.get_item_group(name, group)
end
function core.setting_get_pos(name)
local value = core.settings:get(name)
if not value then
return nil
end
return core.string_to_pos(value)
end
-- See l_env.cpp for the other functions
function core.get_artificial_light(param1)
return math.floor(param1 / 16)
end
-- PNG encoder safety wrapper
local o_encode_png = core.encode_png
function core.encode_png(width, height, data, compression)
if type(width) ~= "number" then
error("Incorrect type for 'width', expected number, got " .. type(width))
end
if type(height) ~= "number" then
error("Incorrect type for 'height', expected number, got " .. type(height))
end
local expected_byte_count = width * height * 4
if type(data) ~= "table" and type(data) ~= "string" then
error("Incorrect type for 'data', expected table or string, got " .. type(data))
end
local data_length = type(data) == "table" and #data * 4 or string.len(data)
if data_length ~= expected_byte_count then
error(string.format(
"Incorrect length of 'data', width and height imply %d bytes but %d were provided",
expected_byte_count,
data_length
))
end
if type(data) == "table" then
local dataBuf = {}
for i = 1, #data do
dataBuf[i] = core.colorspec_to_bytes(data[i])
end
data = table.concat(dataBuf)
end
return o_encode_png(width, height, data, compression or 6)
end
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