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6431ef7324
One hash table lookup is enough, and this is even easier for the JIT to inline, optimize, etc.
120 lines
3.2 KiB
Lua
120 lines
3.2 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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local def = core.registered_items[name]
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return def and def.groups[group] or 0
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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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-- Helper that pushes a collisionMoveResult structure
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if core.set_push_moveresult1 then
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-- must match CollisionAxis in collision.h
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local AXES = {"x", "y", "z"}
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-- <=> script/common/c_content.cpp push_collision_move_result()
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core.set_push_moveresult1(function(b0, b1, b2, axis, npx, npy, npz, v0x, v0y, v0z, v1x, v1y, v1z, v2x, v2y, v2z)
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return {
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touching_ground = b0,
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collides = b1,
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standing_on_object = b2,
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collisions = {{
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type = "node",
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axis = AXES[axis + 1],
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node_pos = vector.new(npx, npy, npz),
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new_pos = vector.new(v0x, v0y, v0z),
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old_velocity = vector.new(v1x, v1y, v1z),
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new_velocity = vector.new(v2x, v2y, v2z),
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}},
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}
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end)
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core.set_push_moveresult1 = nil
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end
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