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brchess/src/chessdefs.h

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C

/* chessdefs.h - generic/catchall chess definitions.
*
* Copyright (C) 2021-2024 Bruno Raoult ("br")
* Licensed under the GNU General Public License v3.0 or later.
* Some rights reserved. See COPYING.
*
* You should have received a copy of the GNU General Public License along with this
* program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
*
* SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
*
*/
#ifndef _CHESSDEFS_H
#define _CHESSDEFS_H
#include "brlib.h" /* brlib types */
#define ONE 1ull
#define C64(const_u64) const_u64##ULL
#define mask(i) ( (u64) (ONE << (i)) )
#define BOARDSIZE (8*8)
/**
* sq_rel - get relative square
* @sq: white point of view square
* @c: color
*
* Get relative (mirrored if @c is BLACK) square.
* Example: sq_rel(A1, WHITE) = A1, sq_rel(B2, BLACK) = B7
*
* @return: Relative square.
*/
#define sq_rel(sq, c) ((square_t)((sq) ^ (56 * (c))))
/**
* sq_rel_rank - get relative rank
* @rank: white point of view rank
* @c: color
*
* Get relative (mirrored if @c is BLACK) rank.
* Example: sq_rel(RANK_2, WHITE) = RANK_2, sq_rel(RANK_6, BLACK) = RANK_3
*
* @return: Relative rank.
*/
#define sq_rel_rank(rank, c) ((rank_t)((7 * (c)) ^ rank))
/* castle_t bits structure
*/
typedef enum {
CASTLE_WK = (1 << 0), /* 0x01 00000001 */
CASTLE_WQ = (1 << 1), /* 0x02 00000010 */
CASTLE_BK = (1 << 2), /* 0x04 00000100 */
CASTLE_BQ = (1 << 3), /* 0x08 00001000 */
CASTLE_W = (CASTLE_WK | CASTLE_WQ), /* 00000011 W castle mask */
CASTLE_B = (CASTLE_BK | CASTLE_BQ), /* 00001100 B castle mask */
CASTLE_K = (1 << 0), /* generic K/Q, bits 0 and 1 */
CASTLE_Q = (1 << 1),
CASTLE_KQ = (CASTLE_K |CASTLE_Q)
} castle_rights_t;
/* determine is oo or ooo is possible with castle flags f and color c
*/
//#define NORM_CASTLE(f, c) ((f) >> (2 * (c))) /* shift flags to bits 0/1 */
//#define
//(NORM_CASTLE(f, c) & CASTLE_Q)
#define can_oo(f, c) ((f) & (CASTLE_K << ((c) * 2)))
#define can_ooo(f, c) ((f) & (CASTLE_Q << ((c) * 2)))
#define can_castle(f, c) ((f) & (CASTLE_KQ << ((c) * 2)))
#define clr_oo(f, c) ((f) & ~(CASTLE_K << (2 * (c))))
#define clr_ooo(f, c) ((f) & ~(CASTLE_Q << (2 * (c))))
#define clr_castle(f, c) ((f) & ~(CASTLE_KQ << (2 * (c)) ))
/* game phases
*/
#define OPENING 0
#define MIDDLEGAME 1
#define ENDGAME 2
/* forward defs */
typedef struct __pos_s pos_t;
typedef struct __movelist_s movelist_t;
/* basic types
*/
typedef u64 bitboard_t;
/* eval type
*/
//typedef s32 eval_t;
/* forward enum definition is impossible in C11, to simplify
* cross-dependancies, all important enum are moved here.
*/
typedef enum {
_SSQUARE_ = -1, /* force signed enum */
A1 = 0, B1, C1, D1, E1, F1, G1, H1,
A2, B2, C2, D2, E2, F2, G2, H2,
A3, B3, C3, D3, E3, F3, G3, H3,
A4, B4, C4, D4, E4, F4, G4, H4,
A5, B5, C5, D5, E5, F5, G5, H5,
A6, B6, C6, D6, E6, F6, G6, H6,
A7, B7, C7, D7, E7, F7, G7, H7,
A8, B8, C8, D8, E8, F8, G8, H8,
SQUARE_MAX = 64,
SQUARE_NONE = 64
} square_t;
typedef enum {
_SFILE_ = -1, /* force signed enum */
FILE_A = 0, FILE_B, FILE_C, FILE_D, FILE_E, FILE_F, FILE_G, FILE_H,
FILE_MAX,
} file_t;
typedef enum {
_SRANK_ = -1, /* force signed enum */
RANK_1 = 0, RANK_2, RANK_3, RANK_4, RANK_5, RANK_6, RANK_7, RANK_8,
RANK_MAX,
} rank_t;
typedef enum {
NORTH = 8,
EAST = 1,
SOUTH = -NORTH,
WEST = -EAST,
NORTH_EAST = (NORTH + EAST),
SOUTH_EAST = (SOUTH + EAST),
SOUTH_WEST = (SOUTH + WEST),
NORTH_WEST = (NORTH + WEST),
} dir_t;
#endif /* _CHESSDEFS_H */