#ifndef UTILS_H
#define UTILS_H
#include "defines.h"
#include "constants.h"
#include <string>
namespace Napoleon
{
namespace Utils
{
namespace Square
{
int GetA1H8DiagonalIndex(int, int);
int GetA1H8DiagonalIndex(int);
int GetH1A8AntiDiagonalIndex(int, int);
int GetH1A8AntiDiagonalIndex(int);
int GetFileIndex(int);
int GetRankIndex(int);
int GetSquareIndex(int, int);
int Parse(std::string);
std::string ToAlgebraic(Napoleon::Square);
}
namespace BitBoard
{
bool IsBitSet(Napoleon::BitBoard, int);
void Display(Napoleon::BitBoard);
int PopCount(Napoleon::BitBoard bitBoard);
int BitScanForward( Napoleon::BitBoard bitBoard);
int BitScanForwardReset(Napoleon::BitBoard& bitBoard);
}
namespace Piece
{
Byte GetPiece(char);
char GetInitial(Byte);
char GetInitial(Napoleon::Piece);
Color GetOpposite(Color);
}
INLINE int BitBoard::BitScanForward(Napoleon::BitBoard bitBoard)
{
#ifdef __GNUG__
return __builtin_ctzll(bitBoard); // conta il numero di 0 precedenti al primo bit piu` significativo
#elif defined(_MSC_VER)
unsigned long index;
_BitScanForward64(&index, bitBoard);
return (int)index;
#else
return Constants::DeBrujinTable[((bitBoard & -bitBoard) * Constants::DeBrujinValue) >> 58];
#endif
}
INLINE int BitBoard::BitScanForwardReset(Napoleon::BitBoard& bitBoard)
{
Napoleon::BitBoard bb = bitBoard;
bitBoard &= (bitBoard - 1);
#ifdef __GNUG__
return __builtin_ctzll(bb); // conta il numero di 0 precedenti al primo bit piu` significativo
#elif defined(_MSC_VER)
unsigned long index;
_BitScanForward64(&index, bb);
return (int)index;
#else
return Constants::DeBrujinTable[((bb & -bb) * Constants::DeBrujinValue) >> 58];
#endif
}
INLINE int BitBoard::PopCount(Napoleon::BitBoard bitBoard)
{
#ifdef __GNUG__
return __builtin_popcountll(bitBoard);
#else
bitBoard -= ((bitBoard >> 1) & 0x5555555555555555UL);
bitBoard = ((bitBoard >> 2) & 0x3333333333333333UL) + (bitBoard & 0x3333333333333333UL);
bitBoard = ((bitBoard >> 4) + bitBoard) & 0x0F0F0F0F0F0F0F0FUL;
return (int)((bitBoard * 0x0101010101010101UL) >> 56);
#endif
}
inline int Square::GetA1H8DiagonalIndex(int file, int rank)
{
return 7 + rank - file;
}
inline int Square::GetA1H8DiagonalIndex(int squareIndex)
{
return 7 + GetRankIndex(squareIndex) - GetFileIndex(squareIndex);
}
inline int Square::GetH1A8AntiDiagonalIndex(int file, int rank)
{
return rank + file;
}
inline int Square::GetH1A8AntiDiagonalIndex(int squareIndex)
{
return GetRankIndex(squareIndex) + GetFileIndex(squareIndex);
}
inline int Square::GetFileIndex(int squareIndex)
{
return squareIndex & 7;
}
inline int Square::GetRankIndex(int squareIndex)
{
return squareIndex >> 3;
}
inline int Square::GetSquareIndex(int file, int rank)
{
return file + 8 * rank;
}
inline Color Piece::GetOpposite(Color color)
{
return Color(1 ^ color);
}
}
}
#endif // UTILS_H
