mirror of
https://github.com/official-stockfish/Stockfish.git
synced 2026-07-24 21:57:14 +00:00
Joost VandeVondele
28844fc697
Happy New Year! closes https://github.com/official-stockfish/Stockfish/pull/6514 No functional change
129 lines
5.1 KiB
C++
129 lines
5.1 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2026 The Stockfish developers (see AUTHORS file)
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//Definition of input features HalfKP of NNUE evaluation function
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#ifndef NNUE_FEATURES_HALF_KA_V2_HM_H_INCLUDED
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#define NNUE_FEATURES_HALF_KA_V2_HM_H_INCLUDED
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#include <cstdint>
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#include "../../misc.h"
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#include "../../types.h"
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#include "../nnue_common.h"
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namespace Stockfish {
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class Position;
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}
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namespace Stockfish::Eval::NNUE::Features {
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// Feature HalfKAv2_hm: Combination of the position of own king and the
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// position of pieces. Position mirrored such that king is always on e..h files.
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class HalfKAv2_hm {
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// Unique number for each piece type on each square
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enum {
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PS_NONE = 0,
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PS_W_PAWN = 0,
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PS_B_PAWN = 1 * SQUARE_NB,
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PS_W_KNIGHT = 2 * SQUARE_NB,
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PS_B_KNIGHT = 3 * SQUARE_NB,
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PS_W_BISHOP = 4 * SQUARE_NB,
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PS_B_BISHOP = 5 * SQUARE_NB,
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PS_W_ROOK = 6 * SQUARE_NB,
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PS_B_ROOK = 7 * SQUARE_NB,
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PS_W_QUEEN = 8 * SQUARE_NB,
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PS_B_QUEEN = 9 * SQUARE_NB,
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PS_KING = 10 * SQUARE_NB,
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PS_NB = 11 * SQUARE_NB
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};
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static constexpr IndexType PieceSquareIndex[COLOR_NB][PIECE_NB] = {
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// Convention: W - us, B - them
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// Viewed from other side, W and B are reversed
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{PS_NONE, PS_W_PAWN, PS_W_KNIGHT, PS_W_BISHOP, PS_W_ROOK, PS_W_QUEEN, PS_KING, PS_NONE,
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PS_NONE, PS_B_PAWN, PS_B_KNIGHT, PS_B_BISHOP, PS_B_ROOK, PS_B_QUEEN, PS_KING, PS_NONE},
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{PS_NONE, PS_B_PAWN, PS_B_KNIGHT, PS_B_BISHOP, PS_B_ROOK, PS_B_QUEEN, PS_KING, PS_NONE,
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PS_NONE, PS_W_PAWN, PS_W_KNIGHT, PS_W_BISHOP, PS_W_ROOK, PS_W_QUEEN, PS_KING, PS_NONE}};
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public:
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// Feature name
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static constexpr const char* Name = "HalfKAv2_hm(Friend)";
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// Hash value embedded in the evaluation file
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static constexpr std::uint32_t HashValue = 0x7f234cb8u;
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// Number of feature dimensions
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static constexpr IndexType Dimensions =
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static_cast<IndexType>(SQUARE_NB) * static_cast<IndexType>(PS_NB) / 2;
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#define B(v) (v * PS_NB)
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// clang-format off
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static constexpr IndexType KingBuckets[SQUARE_NB] = {
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B(28), B(29), B(30), B(31), B(31), B(30), B(29), B(28),
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B(24), B(25), B(26), B(27), B(27), B(26), B(25), B(24),
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B(20), B(21), B(22), B(23), B(23), B(22), B(21), B(20),
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B(16), B(17), B(18), B(19), B(19), B(18), B(17), B(16),
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B(12), B(13), B(14), B(15), B(15), B(14), B(13), B(12),
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B( 8), B( 9), B(10), B(11), B(11), B(10), B( 9), B( 8),
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B( 4), B( 5), B( 6), B( 7), B( 7), B( 6), B( 5), B( 4),
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B( 0), B( 1), B( 2), B( 3), B( 3), B( 2), B( 1), B( 0),
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};
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// clang-format on
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#undef B
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// clang-format off
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// Orient a square according to perspective (rotates by 180 for black)
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static constexpr IndexType OrientTBL[SQUARE_NB] = {
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SQ_H1, SQ_H1, SQ_H1, SQ_H1, SQ_A1, SQ_A1, SQ_A1, SQ_A1,
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SQ_H1, SQ_H1, SQ_H1, SQ_H1, SQ_A1, SQ_A1, SQ_A1, SQ_A1,
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SQ_H1, SQ_H1, SQ_H1, SQ_H1, SQ_A1, SQ_A1, SQ_A1, SQ_A1,
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SQ_H1, SQ_H1, SQ_H1, SQ_H1, SQ_A1, SQ_A1, SQ_A1, SQ_A1,
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SQ_H1, SQ_H1, SQ_H1, SQ_H1, SQ_A1, SQ_A1, SQ_A1, SQ_A1,
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SQ_H1, SQ_H1, SQ_H1, SQ_H1, SQ_A1, SQ_A1, SQ_A1, SQ_A1,
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SQ_H1, SQ_H1, SQ_H1, SQ_H1, SQ_A1, SQ_A1, SQ_A1, SQ_A1,
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SQ_H1, SQ_H1, SQ_H1, SQ_H1, SQ_A1, SQ_A1, SQ_A1, SQ_A1 ,
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};
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// clang-format on
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// Maximum number of simultaneously active features.
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static constexpr IndexType MaxActiveDimensions = 32;
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using IndexList = ValueList<IndexType, MaxActiveDimensions>;
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using DiffType = DirtyPiece;
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// Index of a feature for a given king position and another piece on some square
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static IndexType make_index(Color perspective, Square s, Piece pc, Square ksq);
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// Get a list of indices for active features
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static void append_active_indices(Color perspective, const Position& pos, IndexList& active);
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// Get a list of indices for recently changed features
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static void append_changed_indices(
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Color perspective, Square ksq, const DiffType& diff, IndexList& removed, IndexList& added);
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// Returns whether the change stored in this DirtyPiece means
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// that a full accumulator refresh is required.
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static bool requires_refresh(const DiffType& diff, Color perspective);
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};
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} // namespace Stockfish::Eval::NNUE::Features
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#endif // #ifndef NNUE_FEATURES_HALF_KA_V2_HM_H_INCLUDED
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