(svn r10775) [NoAI] -Sync: with trunk r10535:r10774.
/* $Id$ */
/** @file map.h */
#ifndef MAP_H
#define MAP_H
#include "stdafx.h"
#include "direction.h"
extern uint _map_tile_mask;
/**
* 'Wraps' the given tile to it is within the map. It does
* this by masking the 'high' bits of.
* @param x the tile to 'wrap'
*/
#define TILE_MASK(x) ((x) & _map_tile_mask)
/**
* Asserts when the tile is outside of the map.
* @param x the tile to check
*/
#define TILE_ASSERT(x) assert(TILE_MASK(x) == (x));
/**
* Data that is stored per tile. Also used TileExtended for this.
* Look at docs/landscape.html for the exact meaning of the members.
*/
struct Tile {
byte type_height; ///< The type (bits 4..7) and height of the northern corner
byte m1; ///< Primarily used for ownership information
uint16 m2; ///< Primarily used for indices to towns, industries and stations
byte m3; ///< General purpose
byte m4; ///< General purpose
byte m5; ///< General purpose
byte m6; ///< Primarily used for bridges and rainforest/desert
};
/**
* Data that is stored per tile. Also used Tile for this.
* Look at docs/landscape.html for the exact meaning of the members.
*/
struct TileExtended {
byte m7; ///< Primarily used for newgrf support
};
extern Tile *_m;
extern TileExtended *_me;
void AllocateMap(uint size_x, uint size_y);
/**
* Logarithm of the map size along the X side.
* @note try to avoid using this one
* @return 2^"return value" == MapSizeX()
*/
static inline uint MapLogX()
{
extern uint _map_log_x;
return _map_log_x;
}
/**
* Get the size of the map along the X
* @return the number of tiles along the X of the map
*/
static inline uint MapSizeX()
{
extern uint _map_size_x;
return _map_size_x;
}
/**
* Get the size of the map along the Y
* @return the number of tiles along the Y of the map
*/
static inline uint MapSizeY()
{
extern uint _map_size_y;
return _map_size_y;
}
/**
* Get the size of the map
* @return the number of tiles of the map
*/
static inline uint MapSize()
{
extern uint _map_size;
return _map_size;
}
/**
* Gets the maximum X coordinate within the map, including MP_VOID
* @return the maximum X coordinate
*/
static inline uint MapMaxX()
{
return MapSizeX() - 1;
}
/**
* Gets the maximum X coordinate within the map, including MP_VOID
* @return the maximum X coordinate
*/
static inline uint MapMaxY()
{
return MapSizeY() - 1;
}
/* Scale a number relative to the map size */
uint ScaleByMapSize(uint); // Scale relative to the number of tiles
uint ScaleByMapSize1D(uint); // Scale relative to the circumference of the map
typedef uint32 TileIndex;
typedef int32 TileIndexDiff;
static inline TileIndex TileXY(uint x, uint y)
{
return (y * MapSizeX()) + x;
}
static inline TileIndexDiff TileDiffXY(int x, int y)
{
/* Multiplication gives much better optimization on MSVC than shifting.
* 0 << shift isn't optimized to 0 properly.
* Typically x and y are constants, and then this doesn't result
* in any actual multiplication in the assembly code.. */
return (y * MapSizeX()) + x;
}
static inline TileIndex TileVirtXY(uint x, uint y)
{
return (y >> 4 << MapLogX()) + (x >> 4);
}
enum {
INVALID_TILE = (TileIndex)-1 ///< The very nice invalid tile marker
};
enum {
TILE_SIZE = 16, ///< Tiles are 16x16 "units" in size
TILE_PIXELS = 32, ///< a tile is 32x32 pixels
TILE_HEIGHT = 8, ///< The standard height-difference between tiles on two levels is 8 (z-diff 8)
};
/**
* Get the X component of a tile
* @param tile the tile to get the X component of
* @return the X component
*/
static inline uint TileX(TileIndex tile)
{
return tile & MapMaxX();
}
/**
* Get the Y component of a tile
* @param tile the tile to get the Y component of
* @return the Y component
*/
static inline uint TileY(TileIndex tile)
{
return tile >> MapLogX();
}
struct TileIndexDiffC {
int16 x;
int16 y;
};
static inline TileIndexDiff ToTileIndexDiff(TileIndexDiffC tidc)
{
return (tidc.y << MapLogX()) + tidc.x;
}
#ifndef _DEBUG
#define TILE_ADD(x,y) ((x) + (y))
#else
extern TileIndex TileAdd(TileIndex tile, TileIndexDiff add,
const char *exp, const char *file, int line);
#define TILE_ADD(x, y) (TileAdd((x), (y), #x " + " #y, __FILE__, __LINE__))
#endif
#define TILE_ADDXY(tile, x, y) TILE_ADD(tile, TileDiffXY(x, y))
uint TileAddWrap(TileIndex tile, int addx, int addy);
static inline TileIndexDiffC TileIndexDiffCByDiagDir(DiagDirection dir)
{
extern const TileIndexDiffC _tileoffs_by_diagdir[DIAGDIR_END];
assert(IsValidDiagDirection(dir));
return _tileoffs_by_diagdir[dir];
}
/* Returns tile + the diff given in diff. If the result tile would end up
* outside of the map, INVALID_TILE is returned instead.
*/
static inline TileIndex AddTileIndexDiffCWrap(TileIndex tile, TileIndexDiffC diff)
{
int x = TileX(tile) + diff.x;
int y = TileY(tile) + diff.y;
if (x < 0 || y < 0 || x > (int)MapMaxX() || y > (int)MapMaxY())
return INVALID_TILE;
else
return TileXY(x, y);
}
/**
* Returns the diff between two tiles
*
* @param tile_a from tile
* @param tile_b to tile
* @return the difference between tila_a and tile_b
*/
static inline TileIndexDiffC TileIndexToTileIndexDiffC(TileIndex tile_a, TileIndex tile_b)
{
TileIndexDiffC difference;
difference.x = TileX(tile_a) - TileX(tile_b);
difference.y = TileY(tile_a) - TileY(tile_b);
return difference;
}
/* Functions to calculate distances */
uint DistanceManhattan(TileIndex, TileIndex); ///< also known as L1-Norm. Is the shortest distance one could go over diagonal tracks (or roads)
uint DistanceSquare(TileIndex, TileIndex); ///< euclidian- or L2-Norm squared
uint DistanceMax(TileIndex, TileIndex); ///< also known as L-Infinity-Norm
uint DistanceMaxPlusManhattan(TileIndex, TileIndex); ///< Max + Manhattan
uint DistanceFromEdge(TileIndex); ///< shortest distance from any edge of the map
#define BEGIN_TILE_LOOP(var, w, h, tile) \
{ \
int h_cur = h; \
uint var = tile; \
do { \
int w_cur = w; \
do {
#define END_TILE_LOOP(var, w, h, tile) \
} while (++var, --w_cur != 0); \
} while (var += TileDiffXY(0, 1) - (w), --h_cur != 0); \
}
static inline TileIndexDiff TileOffsByDiagDir(DiagDirection dir)
{
extern const TileIndexDiffC _tileoffs_by_diagdir[DIAGDIR_END];
assert(IsValidDiagDirection(dir));
return ToTileIndexDiff(_tileoffs_by_diagdir[dir]);
}
static inline TileIndexDiff TileOffsByDir(Direction dir)
{
extern const TileIndexDiffC _tileoffs_by_dir[DIR_END];
assert(IsValidDirection(dir));
return ToTileIndexDiff(_tileoffs_by_dir[dir]);
}
typedef bool TestTileOnSearchProc(TileIndex tile, uint32 data);
bool CircularTileSearch(TileIndex tile, uint size, TestTileOnSearchProc proc, uint32 data);
/* Approximation of the length of a straight track, relative to a diagonal
* track (ie the size of a tile side). #defined instead of const so it can
* stay integer. (no runtime float operations) Is this needed?
* Watch out! There are _no_ brackets around here, to prevent intermediate
* rounding! Be careful when using this!
* This value should be sqrt(2)/2 ~ 0.7071 */
#define STRAIGHT_TRACK_LENGTH 7071/10000
#endif /* MAP_H */