--- /dev/null
+/*
+ Stockfish, a UCI chess playing engine derived from Glaurung 2.1
+ Copyright (C) 2004-2020 The Stockfish developers (see AUTHORS file)
+
+ Stockfish is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Stockfish is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+//Definition of input features HalfKP of NNUE evaluation function
+
+#include "half_kp.h"
+#include "index_list.h"
+
+namespace Eval::NNUE::Features {
+
+ // Find the index of the feature quantity from the king position and PieceSquare
+ template <Side AssociatedKing>
+ inline IndexType HalfKP<AssociatedKing>::MakeIndex(Square sq_k, PieceSquare p) {
+ return static_cast<IndexType>(PS_END) * static_cast<IndexType>(sq_k) + p;
+ }
+
+ // Get pieces information
+ template <Side AssociatedKing>
+ inline void HalfKP<AssociatedKing>::GetPieces(
+ const Position& pos, Color perspective,
+ PieceSquare** pieces, Square* sq_target_k) {
+
+ *pieces = (perspective == BLACK) ?
+ pos.eval_list()->piece_list_fb() :
+ pos.eval_list()->piece_list_fw();
+ const PieceId target = (AssociatedKing == Side::kFriend) ?
+ static_cast<PieceId>(PIECE_ID_KING + perspective) :
+ static_cast<PieceId>(PIECE_ID_KING + ~perspective);
+ *sq_target_k = static_cast<Square>(((*pieces)[target] - PS_W_KING) % SQUARE_NB);
+ }
+
+ // Get a list of indices for active features
+ template <Side AssociatedKing>
+ void HalfKP<AssociatedKing>::AppendActiveIndices(
+ const Position& pos, Color perspective, IndexList* active) {
+
+ // Do nothing if array size is small to avoid compiler warning
+ if (RawFeatures::kMaxActiveDimensions < kMaxActiveDimensions) return;
+
+ PieceSquare* pieces;
+ Square sq_target_k;
+ GetPieces(pos, perspective, &pieces, &sq_target_k);
+ for (PieceId i = PIECE_ID_ZERO; i < PIECE_ID_KING; ++i) {
+ if (pieces[i] != PS_NONE) {
+ active->push_back(MakeIndex(sq_target_k, pieces[i]));
+ }
+ }
+ }
+
+ // Get a list of indices for recently changed features
+ template <Side AssociatedKing>
+ void HalfKP<AssociatedKing>::AppendChangedIndices(
+ const Position& pos, Color perspective,
+ IndexList* removed, IndexList* added) {
+
+ PieceSquare* pieces;
+ Square sq_target_k;
+ GetPieces(pos, perspective, &pieces, &sq_target_k);
+ const auto& dp = pos.state()->dirtyPiece;
+ for (int i = 0; i < dp.dirty_num; ++i) {
+ if (dp.pieceId[i] >= PIECE_ID_KING) continue;
+ const auto old_p = static_cast<PieceSquare>(
+ dp.old_piece[i].from[perspective]);
+ if (old_p != PS_NONE) {
+ removed->push_back(MakeIndex(sq_target_k, old_p));
+ }
+ const auto new_p = static_cast<PieceSquare>(
+ dp.new_piece[i].from[perspective]);
+ if (new_p != PS_NONE) {
+ added->push_back(MakeIndex(sq_target_k, new_p));
+ }
+ }
+ }
+
+ template class HalfKP<Side::kFriend>;
+
+} // namespace Eval::NNUE::Features