1

#ifndef MAP_H

     2

#define MAP_H

     3

     4

#include "stdafx.h"

     5

     6

#define TILE_FROM_XY(x,y) (int)((((y) >> 4) << MapLogX()) + ((x) >> 4))

     7

#define TILE_XY(x,y) (((y) << MapLogX()) + (x))

     8

     9

#define TILE_MASK(x) ((x) & ((1 << (MapLogX() + MapLogY())) - 1))

    11

    12

extern byte   *_map_type_and_height;

    13

extern byte   *_map_owner;

    14

extern uint16 *_map2;

    15

extern byte   *_map3_lo;

    16

extern byte   *_map3_hi;

    17

extern byte   *_map5;

    18

extern byte   *_map_extra_bits;

    19

    20

void InitMap(uint log_x, uint log_y);

    21

    22

// binary logarithm of the map size, try to avoid using this one

    23

static inline uint MapLogX(void)  { extern uint _map_log_x; return _map_log_x; }

    24

static inline uint MapLogY(void)  { extern uint _map_log_y; return _map_log_y; }

    25

/* The size of the map */

    26

static inline uint MapSizeX(void) { return 1 << MapLogX(); }

    27

static inline uint MapSizeY(void) { return 1 << MapLogY(); }

    28

/* The maximum coordinates */

    29

static inline uint MapMaxX(void) { return MapSizeX() - 1; }

    30

static inline uint MapMaxY(void) { return MapSizeY() - 1; }

    31

/* The number of tiles in the map */

    32

static inline uint MapSize(void) { return MapSizeX() * MapSizeY(); }

    33

    34

// Scale a number relative to the map size

    35

uint ScaleByMapSize(uint); // Scale relative to the number of tiles

    36

uint ScaleByMapSize1D(uint); // Scale relative to the circumference of the map

    37

    38

typedef uint32 TileIndex;

    39

    40

typedef enum {

    41

	OWNER_TOWN			= 0xf,	// a town owns the tile

    42

	OWNER_NONE			= 0x10,	// nobody owns the tile

    43

	OWNER_WATER			= 0x11,	// "water" owns the tile

    44

	OWNER_SPECTATOR	= 0xff,	// spectator in MP or in scenario editor

    45

} Owner;

    46

    47

enum {

    48

	INVALID_TILE = (uint32) -1

    49

};

    50

    51

static inline uint TileX(TileIndex tile)

    52

{

    53

	return tile & MapMaxX();

    54

}

    55

    56

static inline uint TileY(TileIndex tile)

    57

{

    58

	return tile >> MapLogX();

    59

}

    60

    61

    62

typedef int32 TileIndexDiff;

    63

    64

typedef struct TileIndexDiffC {

    65

	int16 x;

    66

	int16 y;

    67

} TileIndexDiffC;

    68

    69

static inline TileIndexDiff ToTileIndexDiff(TileIndexDiffC tidc)

    70

{

    71

	return (tidc.y << MapLogX()) + tidc.x;

    72

}

    73

    74

    75

#ifndef _DEBUG

    76

	#define TILE_ADD(x,y) ((x) + (y))

    77

#else

    78

	extern TileIndex TileAdd(TileIndex tile, TileIndexDiff add,

    79

		const char *exp, const char *file, int line);

    80

	#define TILE_ADD(x, y) (TileAdd((x), (y), #x " + " #y, __FILE__, __LINE__))

    81

#endif

    82

    83

#define TILE_ADDXY(tile, x, y) TILE_ADD(tile, TILE_XY(x, y))

    84

    85

uint TileAddWrap(TileIndex tile, int addx, int addy);

    86

    87

static inline TileIndexDiffC TileIndexDiffCByDir(uint dir) {

    88

	extern const TileIndexDiffC _tileoffs_by_dir[4];

    89

	return _tileoffs_by_dir[dir];

    90

}

    91

    92

/* Returns tile + the diff given in diff. If the result tile would end up

    93

 * outside of the map, INVALID_TILE is returned instead.

    94

 */

    95

static inline TileIndex AddTileIndexDiffCWrap(TileIndex tile, TileIndexDiffC diff) {

    96

	int x = TileX(tile) + diff.x;

    97

	int y = TileY(tile) + diff.y;

    98

	if (x < 0 || y < 0 || x > (int)MapMaxX() || y > (int)MapMaxY())

    99

		return INVALID_TILE;

   100

	else

   101

		return TILE_XY(x, y);

   102

}

   103

   104

// Functions to calculate distances

   105

uint DistanceManhattan(TileIndex, TileIndex); // also known as L1-Norm

   106

uint DistanceSquare(TileIndex, TileIndex); // euclidian- or L2-Norm squared

   107

uint DistanceMax(TileIndex, TileIndex); // also known as L-Infinity-Norm

   108

uint DistanceMaxPlusManhattan(TileIndex, TileIndex); // Max + Manhattan

   109

uint DistanceFromEdge(TileIndex); // shortest distance from any edge of the map

   110

   111

   112

static inline TileIndexDiff TileOffsByDir(uint dir)

   113

{

   114

	extern const TileIndexDiffC _tileoffs_by_dir[4];

   115

   116

	assert(dir < lengthof(_tileoffs_by_dir));

   117

	return ToTileIndexDiff(_tileoffs_by_dir[dir]);

   118

}

   119

   120

#endif