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100 lines
2.6 KiB
Lua
100 lines
2.6 KiB
Lua
-- Minetest: builtin/misc_s.lua
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-- The distinction of what goes here is a bit tricky, basically it's everything
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-- that does not (directly or indirectly) need access to ServerEnvironment,
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-- Server or writable access to IGameDef on the engine side.
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-- (The '_s' stands for standalone.)
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--
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-- Misc. API functions
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--
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-- This must match the implementation in src/script/common/c_converter.h
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function core.hash_node_position(pos)
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return (pos.z + 0x8000) * 0x100000000 + (pos.y + 0x8000) * 0x10000 + (pos.x + 0x8000)
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end
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function core.get_position_from_hash(hash)
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local x = (hash % 65536) - 32768
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hash = math.floor(hash / 65536)
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local y = (hash % 65536) - 32768
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hash = math.floor(hash / 65536)
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local z = (hash % 65536) - 32768
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return vector.new(x, y, z)
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end
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function core.get_item_group(name, group)
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if not core.registered_items[name] or not
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core.registered_items[name].groups[group] then
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return 0
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end
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return core.registered_items[name].groups[group]
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end
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function core.get_node_group(name, group)
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core.log("deprecated", "Deprecated usage of get_node_group, use get_item_group instead")
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return core.get_item_group(name, group)
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end
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function core.setting_get_pos(name)
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local value = core.settings:get(name)
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if not value then
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return nil
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end
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return core.string_to_pos(value)
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end
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-- See l_env.cpp for the other functions
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function core.get_artificial_light(param1)
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return math.floor(param1 / 16)
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end
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-- PNG encoder safety wrapper
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local o_encode_png = core.encode_png
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function core.encode_png(width, height, data, compression)
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if type(width) ~= "number" then
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error("Incorrect type for 'width', expected number, got " .. type(width))
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end
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if type(height) ~= "number" then
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error("Incorrect type for 'height', expected number, got " .. type(height))
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end
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if width < 1 then
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error("Incorrect value for 'width', must be at least 1")
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end
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if height < 1 then
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error("Incorrect value for 'height', must be at least 1")
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end
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local expected_byte_count = width * height * 4
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if type(data) ~= "table" and type(data) ~= "string" then
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error("Incorrect type for 'data', expected table or string, got " .. type(data))
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end
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local data_length = type(data) == "table" and #data * 4 or string.len(data)
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if data_length ~= expected_byte_count then
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error(string.format(
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"Incorrect length of 'data', width and height imply %d bytes but %d were provided",
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expected_byte_count,
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data_length
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))
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end
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if type(data) == "table" then
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local dataBuf = {}
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for i = 1, #data do
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dataBuf[i] = core.colorspec_to_bytes(data[i])
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end
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data = table.concat(dataBuf)
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end
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return o_encode_png(width, height, data, compression or 6)
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end
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