mirror of
https://github.com/JGRennison/OpenTTD-patches.git
synced 2024-11-11 13:10:45 +00:00
ab535c0a86
This removes the ability to explicitly cast to the base type, but the requirement to use .base() means the conversion is still explicit.
662 lines
18 KiB
C++
662 lines
18 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_func.h Functions related to maps. */
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#ifndef MAP_FUNC_H
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#define MAP_FUNC_H
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#include "core/math_func.hpp"
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#include "tile_type.h"
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#include "map_type.h"
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#include "direction_func.h"
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/**
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* Wrapper class to abstract away the way the tiles are stored. It is
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* intended to be used to access the "map" data of a single tile.
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*
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* The wrapper is expected to be fully optimized away by the compiler, even
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* with low optimization levels except when completely disabling it.
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*/
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class Tile {
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private:
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friend struct Map;
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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 TileBase {
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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(TileBase) == 8);
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/**
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* Data that is stored per tile. Also used TileBase 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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static TileBase *base_tiles; ///< Pointer to the tile-array.
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static TileExtended *extended_tiles; ///< Pointer to the extended tile-array.
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TileIndex tile; ///< The tile to access the map data for.
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public:
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/**
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* Create the tile wrapper for the given tile.
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* @param tile The tile to access the map for.
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*/
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debug_inline Tile(TileIndex tile) : tile(tile) {}
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/**
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* Create the tile wrapper for the given tile.
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* @param tile The tile to access the map for.
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*/
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Tile(uint tile) : tile(tile) {}
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/**
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* Implicit conversion to the TileIndex.
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*/
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debug_inline constexpr operator TileIndex() const { return tile; }
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/**
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* Implicit conversion to the uint for bounds checking.
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*/
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debug_inline constexpr operator uint() const { return tile.base(); }
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/**
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* The type (bits 4..7), bridges (2..3), rainforest/desert (0..1)
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*
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* Look at docs/landscape.html for the exact meaning of the data.
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* @param tile The tile to get the data for.
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* @return reference to the byte holding the data.
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*/
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debug_inline byte &type()
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{
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return base_tiles[tile.base()].type;
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}
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/**
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* The height of the northern corner
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*
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* Look at docs/landscape.html for the exact meaning of the data.
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* @param tile The tile to get the height for.
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* @return reference to the byte holding the height.
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*/
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debug_inline byte &height()
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{
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return base_tiles[tile.base()].height;
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}
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/**
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* Primarily used for ownership information
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*
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* Look at docs/landscape.html for the exact meaning of the data.
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* @param tile The tile to get the data for.
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* @return reference to the byte holding the data.
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*/
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debug_inline byte &m1()
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{
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return base_tiles[tile.base()].m1;
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}
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/**
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* Primarily used for indices to towns, industries and stations
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*
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* Look at docs/landscape.html for the exact meaning of the data.
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* @param tile The tile to get the data for.
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* @return reference to the uint16_t holding the data.
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*/
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debug_inline uint16_t &m2()
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{
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return base_tiles[tile.base()].m2;
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}
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/**
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* General purpose
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*
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* Look at docs/landscape.html for the exact meaning of the data.
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* @param tile The tile to get the data for.
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* @return reference to the byte holding the data.
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*/
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debug_inline byte &m3()
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{
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return base_tiles[tile.base()].m3;
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}
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/**
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* General purpose
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*
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* Look at docs/landscape.html for the exact meaning of the data.
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* @param tile The tile to get the data for.
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* @return reference to the byte holding the data.
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*/
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debug_inline byte &m4()
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{
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return base_tiles[tile.base()].m4;
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}
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/**
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* General purpose
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*
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* Look at docs/landscape.html for the exact meaning of the data.
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* @param tile The tile to get the data for.
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* @return reference to the byte holding the data.
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*/
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debug_inline byte &m5()
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{
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return base_tiles[tile.base()].m5;
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}
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/**
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* General purpose
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*
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* Look at docs/landscape.html for the exact meaning of the data.
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* @param tile The tile to get the data for.
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* @return reference to the byte holding the data.
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*/
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debug_inline byte &m6()
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{
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return extended_tiles[tile.base()].m6;
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}
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/**
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* Primarily used for newgrf support
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*
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* Look at docs/landscape.html for the exact meaning of the data.
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* @param tile The tile to get the data for.
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* @return reference to the byte holding the data.
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*/
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debug_inline byte &m7()
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{
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return extended_tiles[tile.base()].m7;
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}
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/**
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* General purpose
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*
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* Look at docs/landscape.html for the exact meaning of the data.
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* @param tile The tile to get the data for.
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* @return reference to the uint16_t holding the data.
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*/
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debug_inline uint16_t &m8()
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{
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return extended_tiles[tile.base()].m8;
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}
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};
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/**
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* Size related data of the map.
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*/
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struct Map {
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private:
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/**
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* Iterator to iterate all Tiles
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*/
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struct Iterator {
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typedef Tile value_type;
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typedef Tile *pointer;
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typedef Tile &reference;
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typedef size_t difference_type;
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typedef std::forward_iterator_tag iterator_category;
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explicit Iterator(TileIndex index) : index(index) {}
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bool operator==(const Iterator &other) const { return this->index == other.index; }
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bool operator!=(const Iterator &other) const { return !(*this == other); }
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Tile operator*() const { return this->index; }
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Iterator & operator++() { this->index++; return *this; }
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private:
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TileIndex index;
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};
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/*
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* Iterable ensemble of all Tiles
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*/
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struct IterateWrapper {
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Iterator begin() { return Iterator(0); }
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Iterator end() { return Iterator(Map::Size()); }
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bool empty() { return false; }
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};
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static uint log_x; ///< 2^_map_log_x == _map_size_x
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static uint log_y; ///< 2^_map_log_y == _map_size_y
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static uint size_x; ///< Size of the map along the X
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static uint size_y; ///< Size of the map along the Y
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static uint size; ///< The number of tiles on the map
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static uint tile_mask; ///< _map_size - 1 (to mask the mapsize)
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public:
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static void Allocate(uint size_x, uint size_y);
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/**
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* Logarithm of the map size along the X side.
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* @note try to avoid using this one
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* @return 2^"return value" == Map::SizeX()
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*/
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debug_inline static uint LogX()
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{
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return Map::log_x;
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}
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/**
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* Logarithm of the map size along the y side.
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* @note try to avoid using this one
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* @return 2^"return value" == Map::SizeY()
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*/
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static inline uint LogY()
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{
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return Map::log_y;
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}
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/**
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* Get the size of the map along the X
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* @return the number of tiles along the X of the map
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*/
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debug_inline static uint SizeX()
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{
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return Map::size_x;
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}
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/**
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* Get the size of the map along the Y
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* @return the number of tiles along the Y of the map
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*/
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static inline uint SizeY()
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{
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return Map::size_y;
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}
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/**
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* Get the size of the map
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* @return the number of tiles of the map
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*/
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debug_inline static uint Size()
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{
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return Map::size;
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}
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/**
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* Gets the maximum X coordinate within the map, including MP_VOID
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* @return the maximum X coordinate
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*/
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debug_inline static uint MaxX()
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{
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return Map::SizeX() - 1;
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}
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/**
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* Gets the maximum Y coordinate within the map, including MP_VOID
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* @return the maximum Y coordinate
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*/
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static inline uint MaxY()
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{
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return Map::SizeY() - 1;
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}
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/**
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* 'Wraps' the given "tile" so it is within the map.
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* It does this by masking the 'high' bits of.
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* @param tile the tile to 'wrap'
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*/
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static inline TileIndex WrapToMap(TileIndex tile)
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{
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return tile.base() & Map::tile_mask;
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}
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/**
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* Scales the given value by the map size, where the given value is
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* for a 256 by 256 map.
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* @param n the value to scale
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* @return the scaled size
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*/
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static inline uint ScaleBySize(uint n)
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{
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/* Subtract 12 from shift in order to prevent integer overflow
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* for large values of n. It's safe since the min mapsize is 64x64. */
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return CeilDiv(n << (Map::LogX() + Map::LogY() - 12), 1 << 4);
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}
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/**
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* Scales the given value by the maps circumference, where the given
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* value is for a 256 by 256 map
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* @param n the value to scale
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* @return the scaled size
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*/
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static inline uint ScaleBySize1D(uint n)
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{
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/* Normal circumference for the X+Y is 256+256 = 1<<9
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* Note, not actually taking the full circumference into account,
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* just half of it. */
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return CeilDiv((n << Map::LogX()) + (n << Map::LogY()), 1 << 9);
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}
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/**
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* Check whether the map has been initialized, as to not try to save the map
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* during crashlog when the map is not there yet.
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* @return true when the map has been allocated/initialized.
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*/
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static bool IsInitialized()
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{
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return Tile::base_tiles != nullptr;
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}
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/**
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* Returns an iterable ensemble of all Tiles
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* @return an iterable ensemble of all Tiles
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*/
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static IterateWrapper Iterate() { return IterateWrapper(); }
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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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* Returns the TileIndex of a coordinate.
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*
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* @param x The x coordinate of the tile
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* @param y The y coordinate of the tile
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* @return The TileIndex calculated by the coordinate
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*/
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debug_inline static TileIndex TileXY(uint x, uint y)
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{
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return (y << Map::LogX()) + x;
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}
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/**
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* Calculates an offset for the given coordinate(-offset).
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*
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* This function calculate an offset value which can be added to a
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* #TileIndex. The coordinates can be negative.
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*
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* @param x The offset in x direction
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* @param y The offset in y direction
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* @return The resulting offset value of the given coordinate
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* @see ToTileIndexDiff(TileIndexDiffC)
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*/
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static inline TileIndexDiff TileDiffXY(int x, int y)
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{
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/* Multiplication gives much better optimization on MSVC than shifting.
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* 0 << shift isn't optimized to 0 properly.
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* Typically x and y are constants, and then this doesn't result
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* in any actual multiplication in the assembly code.. */
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return (y * Map::SizeX()) + x;
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}
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/**
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* Get a tile from the virtual XY-coordinate.
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* @param x The virtual x coordinate of the tile.
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* @param y The virtual y coordinate of the tile.
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* @return The TileIndex calculated by the coordinate.
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*/
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debug_inline static TileIndex TileVirtXY(uint x, uint y)
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{
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return (y >> 4 << Map::LogX()) + (x >> 4);
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}
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/**
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* Get the X component of a tile
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* @param tile the tile to get the X component of
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* @return the X component
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*/
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debug_inline static uint TileX(TileIndex tile)
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{
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return tile.base() & Map::MaxX();
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}
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/**
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* Get the Y component of a tile
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* @param tile the tile to get the Y component of
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* @return the Y component
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*/
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debug_inline static uint TileY(TileIndex tile)
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{
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return tile.base() >> Map::LogX();
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}
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/**
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* Return the offset between two tiles from a TileIndexDiffC struct.
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*
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* This function works like #TileDiffXY(int, int) and returns the
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* difference between two tiles.
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*
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* @param tidc The coordinate of the offset as TileIndexDiffC
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* @return The difference between two tiles.
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* @see TileDiffXY(int, int)
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*/
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static inline TileIndexDiff ToTileIndexDiff(TileIndexDiffC tidc)
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{
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return (tidc.y << Map::LogX()) + tidc.x;
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}
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#ifndef _DEBUG
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/**
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* Adds two tiles together.
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*
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* @param x One tile
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* @param y Another tile to add
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* @return The resulting tile(index)
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*/
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# define TILE_ADD(x, y) ((x) + (y))
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#else
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extern TileIndex TileAdd(TileIndex tile, TileIndexDiff add,
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const char *exp, const char *file, int line);
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# define TILE_ADD(x, y) (TileAdd((x), (y), #x " + " #y, __FILE__, __LINE__))
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#endif
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/**
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* Adds a given offset to a tile.
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*
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* @param tile The tile to add an offset on it
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* @param x The x offset to add to the tile
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* @param y The y offset to add to the tile
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*/
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#define TILE_ADDXY(tile, x, y) TILE_ADD(tile, TileDiffXY(x, y))
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TileIndex TileAddWrap(TileIndex tile, int addx, int addy);
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/**
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* Returns the TileIndexDiffC offset from a DiagDirection.
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*
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* @param dir The given direction
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* @return The offset as TileIndexDiffC value
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*/
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static inline TileIndexDiffC TileIndexDiffCByDiagDir(DiagDirection dir)
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{
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extern const TileIndexDiffC _tileoffs_by_diagdir[DIAGDIR_END];
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assert(IsValidDiagDirection(dir));
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return _tileoffs_by_diagdir[dir];
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}
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/**
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* Returns the TileIndexDiffC offset from a Direction.
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*
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* @param dir The given direction
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* @return The offset as TileIndexDiffC value
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*/
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static inline TileIndexDiffC TileIndexDiffCByDir(Direction dir)
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{
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extern const TileIndexDiffC _tileoffs_by_dir[DIR_END];
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assert(IsValidDirection(dir));
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return _tileoffs_by_dir[dir];
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}
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/**
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* Add a TileIndexDiffC to a TileIndex and returns the new one.
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*
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* Returns tile + the diff given in diff. If the result tile would end up
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* outside of the map, INVALID_TILE is returned instead.
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*
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* @param tile The base tile to add the offset on
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* @param diff The offset to add on the tile
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* @return The resulting TileIndex
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*/
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static inline TileIndex AddTileIndexDiffCWrap(TileIndex tile, TileIndexDiffC diff)
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{
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int x = TileX(tile) + diff.x;
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int y = TileY(tile) + diff.y;
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/* Negative value will become big positive value after cast */
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if ((uint)x >= Map::SizeX() || (uint)y >= Map::SizeY()) return INVALID_TILE;
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return TileXY(x, y);
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}
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/**
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* Returns the diff between two tiles
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*
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* @param tile_a from tile
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* @param tile_b to tile
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* @return the difference between tila_a and tile_b
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*/
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static inline TileIndexDiffC TileIndexToTileIndexDiffC(TileIndex tile_a, TileIndex tile_b)
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{
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TileIndexDiffC difference;
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difference.x = TileX(tile_a) - TileX(tile_b);
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difference.y = TileY(tile_a) - TileY(tile_b);
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return difference;
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}
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/* Functions to calculate distances */
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uint DistanceManhattan(TileIndex, TileIndex); ///< also known as L1-Norm. Is the shortest distance one could go over diagonal tracks (or roads)
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uint DistanceSquare(TileIndex, TileIndex); ///< euclidian- or L2-Norm squared
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uint DistanceMax(TileIndex, TileIndex); ///< also known as L-Infinity-Norm
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uint DistanceMaxPlusManhattan(TileIndex, TileIndex); ///< Max + Manhattan
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uint DistanceFromEdge(TileIndex); ///< shortest distance from any edge of the map
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uint DistanceFromEdgeDir(TileIndex, DiagDirection); ///< distance from the map edge in given direction
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/**
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* Convert a DiagDirection to a TileIndexDiff
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*
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* @param dir The DiagDirection
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* @return The resulting TileIndexDiff
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* @see TileIndexDiffCByDiagDir
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*/
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static inline TileIndexDiff TileOffsByDiagDir(DiagDirection dir)
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{
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extern const TileIndexDiffC _tileoffs_by_diagdir[DIAGDIR_END];
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assert(IsValidDiagDirection(dir));
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return ToTileIndexDiff(_tileoffs_by_diagdir[dir]);
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}
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/**
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* Convert a Direction to a TileIndexDiff.
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*
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* @param dir The direction to convert from
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* @return The resulting TileIndexDiff
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|
*/
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static inline TileIndexDiff TileOffsByDir(Direction dir)
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|
{
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extern const TileIndexDiffC _tileoffs_by_dir[DIR_END];
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|
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assert(IsValidDirection(dir));
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return ToTileIndexDiff(_tileoffs_by_dir[dir]);
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}
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/**
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* Adds a Direction to a tile.
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*
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* @param tile The current tile
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* @param dir The direction in which we want to step
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* @return the moved tile
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|
*/
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static inline TileIndex TileAddByDir(TileIndex tile, Direction dir)
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|
{
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return TILE_ADD(tile, TileOffsByDir(dir));
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|
}
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|
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/**
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|
* Adds a DiagDir to a tile.
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|
*
|
|
* @param tile The current tile
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|
* @param dir The direction in which we want to step
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|
* @return the moved tile
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|
*/
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static inline TileIndex TileAddByDiagDir(TileIndex tile, DiagDirection dir)
|
|
{
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|
return TILE_ADD(tile, TileOffsByDiagDir(dir));
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|
}
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|
|
|
/**
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|
* Determines the DiagDirection to get from one tile to another.
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|
* The tiles do not necessarily have to be adjacent.
|
|
* @param tile_from Origin tile
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|
* @param tile_to Destination tile
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|
* @return DiagDirection from tile_from towards tile_to, or INVALID_DIAGDIR if the tiles are not on an axis
|
|
*/
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|
static inline DiagDirection DiagdirBetweenTiles(TileIndex tile_from, TileIndex tile_to)
|
|
{
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|
int dx = (int)TileX(tile_to) - (int)TileX(tile_from);
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|
int dy = (int)TileY(tile_to) - (int)TileY(tile_from);
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|
if (dx == 0) {
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|
if (dy == 0) return INVALID_DIAGDIR;
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|
return (dy < 0 ? DIAGDIR_NW : DIAGDIR_SE);
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|
} else {
|
|
if (dy != 0) return INVALID_DIAGDIR;
|
|
return (dx < 0 ? DIAGDIR_NE : DIAGDIR_SW);
|
|
}
|
|
}
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|
|
|
/**
|
|
* A callback function type for searching tiles.
|
|
*
|
|
* @param tile The tile to test
|
|
* @param user_data additional data for the callback function to use
|
|
* @return A boolean value, depend on the definition of the function.
|
|
*/
|
|
typedef bool TestTileOnSearchProc(TileIndex tile, void *user_data);
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|
|
|
bool CircularTileSearch(TileIndex *tile, uint size, TestTileOnSearchProc proc, void *user_data);
|
|
bool CircularTileSearch(TileIndex *tile, uint radius, uint w, uint h, TestTileOnSearchProc proc, void *user_data);
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|
|
|
/**
|
|
* Get a random tile out of a given seed.
|
|
* @param r the random 'seed'
|
|
* @return a valid tile
|
|
*/
|
|
static inline TileIndex RandomTileSeed(uint32_t r)
|
|
{
|
|
return Map::WrapToMap(r);
|
|
}
|
|
|
|
/**
|
|
* Get a valid random tile.
|
|
* @note a define so 'random' gets inserted in the place where it is actually
|
|
* called, thus making the random traces more explicit.
|
|
* @return a valid tile
|
|
*/
|
|
#define RandomTile() RandomTileSeed(Random())
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|
|
|
uint GetClosestWaterDistance(TileIndex tile, bool water);
|
|
|
|
#endif /* MAP_FUNC_H */
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