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90 lines
3.4 KiB
C
90 lines
3.4 KiB
C
/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file map_type.h Types related to maps. */
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#ifndef MAP_TYPE_H
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#define MAP_TYPE_H
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/**
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* Data that is stored per tile. Also used TileExtended for this.
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* Look at docs/landscape.html for the exact meaning of the members.
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*/
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struct Tile {
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byte type; ///< The type (bits 4..7), bridges (2..3), rainforest/desert (0..1)
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byte height; ///< The height of the northern corner.
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uint16_t m2; ///< Primarily used for indices to towns, industries and stations
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byte m1; ///< Primarily used for ownership information
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byte m3; ///< General purpose
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byte m4; ///< General purpose
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byte m5; ///< General purpose
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};
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static_assert(sizeof(Tile) == 8);
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/**
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* Data that is stored per tile. Also used Tile for this.
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* Look at docs/landscape.html for the exact meaning of the members.
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*/
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struct TileExtended {
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byte m6; ///< General purpose
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byte m7; ///< Primarily used for newgrf support
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uint16_t m8; ///< General purpose
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};
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/**
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* An offset value between two tiles.
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*
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* This value is used for the difference between
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* two tiles. It can be added to a TileIndex to get
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* the resulting TileIndex of the start tile applied
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* with this saved difference.
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*
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* @see TileDiffXY(int, int)
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*/
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typedef int32_t TileIndexDiff;
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/**
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* A pair-construct of a TileIndexDiff.
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*
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* This can be used to save the difference between to
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* tiles as a pair of x and y value.
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*/
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struct TileIndexDiffC {
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int16_t x; ///< The x value of the coordinate
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int16_t y; ///< The y value of the coordinate
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};
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/** Minimal and maximal map width and height */
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static const uint MIN_MAP_SIZE_BITS = 6; ///< Minimal size of map is equal to 2 ^ MIN_MAP_SIZE_BITS
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static const uint MAX_MAP_SIZE_BITS = 20; ///< Maximal size of map is equal to 2 ^ MAX_MAP_SIZE_BITS
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static const uint MAX_MAP_TILES_BITS = 28; ///< Maximal number of tiles in a map is equal to 2 ^ MAX_MAP_TILES_BITS.
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static const uint MIN_MAP_SIZE = 1U << MIN_MAP_SIZE_BITS; ///< Minimal map size = 64
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static const uint MAX_MAP_SIZE = 1U << MAX_MAP_SIZE_BITS; ///< Maximal map size = 1M
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static const uint MAX_MAP_TILES = 1U << MAX_MAP_TILES_BITS; ///< Maximal number of tiles in a map = 256M (16k x 16k)
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/**
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* Approximation of the length of a straight track, relative to a diagonal
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* track (ie the size of a tile side).
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*
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* \#defined instead of const so it can
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* stay integer. (no runtime float operations) Is this needed?
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* Watch out! There are _no_ brackets around here, to prevent intermediate
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* rounding! Be careful when using this!
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* This value should be sqrt(2)/2 ~ 0.7071
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*/
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#define STRAIGHT_TRACK_LENGTH 7071/10000
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/** Argument for CmdLevelLand describing what to do. */
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enum LevelMode {
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LM_LEVEL, ///< Level the land.
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LM_LOWER, ///< Lower the land.
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LM_RAISE, ///< Raise the land.
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};
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#endif /* MAP_TYPE_H */
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