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#ifndef MAP_H

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#define MAP_H

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

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

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

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extern byte   _map_type_and_height[];

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extern byte   _map5[];

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extern byte   _map3_lo[];

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extern byte   _map3_hi[];

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extern byte   _map_owner[];

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extern uint16 _map2[];

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extern byte   _map_extra_bits[];

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

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

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

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/* The size of the map */

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

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

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/* The maximum coordinates */

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

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

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/* The number of tiles in the map */

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

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typedef uint16 TileIndex;

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static inline uint TileX(TileIndex tile)

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{

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	return tile & MapMaxX();

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}

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static inline uint TileY(TileIndex tile)

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{

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	return tile >> MapLogX();

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}

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typedef int16 TileIndexDiff;

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typedef struct TileIndexDiffC {

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	int16 x;

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	int16 y;

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} TileIndexDiffC;

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static inline TileIndexDiff ToTileIndexDiff(TileIndexDiffC tidc)

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{

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

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}

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#ifndef _DEBUG

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

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static inline TileIndexDiff TileOffsByDir(uint dir)

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{

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	extern const TileIndexDiffC _tileoffs_by_dir[4];

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	assert(dir < lengthof(_tileoffs_by_dir));

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	return ToTileIndexDiff(_tileoffs_by_dir[dir]);

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}

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#endif