78 lines
2.7 KiB
Lua
78 lines
2.7 KiB
Lua
--[[
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Copyright (C) 2021 Jude Melton-Houghton
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This file is part of area_containers. It implements the protection layer.
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area_containers is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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area_containers is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with area_containers. If not, see <https://www.gnu.org/licenses/>.
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]]
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--[[
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OVERVIEW
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The protection layer extends one block above and below the inside Y-level
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block. It excludes the insides (but walls are protected.)
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]]
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-- Name the private namespace:
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local area_containers = ...
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-- Rounds a vector component down to the nearest block size.
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local function floor_blocksize(pos)
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return math.floor(pos / 16) * 16
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end
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-- Checks whether the position is protected only according to area_containers.
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-- See the overview for this file.
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local function is_area_containers_protected(pos, name)
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-- The minimum position of the block containing pos:
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local block_min_pos = vector.apply(pos, floor_blocksize)
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-- Check that the position is within one block of the inside Y-level:
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if block_min_pos.y - 16 <= area_containers.inside_y_level and
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block_min_pos.y + 16 >= area_containers.inside_y_level then
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if area_containers.get_params_from_inside(block_min_pos) then
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-- The position is in an inside block.
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-- Protect the walls:
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local block_offset = vector.subtract(pos, block_min_pos)
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if block_offset.x == 0 or block_offset.x == 15 or
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block_offset.y == 0 or block_offset.y == 15 or
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block_offset.z == 0 or block_offset.z == 15 then
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return true
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end
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else
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-- Non-inside blocks in the layer are protected.
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return true
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end
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end
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return false
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end
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-- The old minetest.is_protected. This is set when is_protected is registered.
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local old_is_protected = nil
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-- The soon-to-be new value of minetest.is_protected.
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function is_protected(pos, name)
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-- Apply our mod's protection unless the player can bypass it:
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if not minetest.check_player_privs(name, "protection_bypass") and
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is_area_containers_protected(pos, name) then
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return true
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end
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return old_is_protected(pos, name)
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end
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-- Sets up the is_protected function.
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function area_containers.register_is_protected()
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old_is_protected = minetest.is_protected
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minetest.is_protected = is_protected
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end
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