Initial import of Glaurung 2.1

src/value.h

@@ -0,0 +1,164 @@
+/*
+  Glaurung, a UCI chess playing engine.
+  Copyright (C) 2004-2008 Tord Romstad
+
+  Glaurung 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.
+  
+  Glaurung 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/>.
+*/
+
+
+#if !defined(VALUE_H_INCLUDED)
+#define VALUE_H_INCLUDED
+
+////
+//// Includes
+////
+
+#include "piece.h"
+
+
+////
+//// Types
+////
+
+enum ValueType {
+  VALUE_TYPE_NONE = 0,
+  VALUE_TYPE_UPPER = 1,  // Upper bound
+  VALUE_TYPE_LOWER = 2,  // Lower bound
+  VALUE_TYPE_EXACT = 3   // Exact score
+};
+
+
+enum Value {
+  VALUE_DRAW = 0,
+  VALUE_KNOWN_WIN = 15000,
+  VALUE_MATE = 30000,
+  VALUE_INFINITE = 30001,
+  VALUE_NONE = 30002
+};
+
+
+////
+//// Constants and variables
+////
+
+/// Piece values, middle game and endgame
+
+/// Important: If the material values are changed, one must also
+/// adjust the piece square tables, and the method game_phase() in the
+/// Position class!
+
+const Value PawnValueMidgame = Value(0xCC);
+const Value PawnValueEndgame = Value(0x100);
+const Value KnightValueMidgame = Value(0x340);
+const Value KnightValueEndgame = Value(0x340);
+const Value BishopValueMidgame = Value(0x340);
+const Value BishopValueEndgame = Value(0x340);
+const Value RookValueMidgame = Value(0x505);
+const Value RookValueEndgame = Value(0x505);
+const Value QueenValueMidgame = Value(0xA00);
+const Value QueenValueEndgame = Value(0xA00);
+
+const Value PieceValueMidgame[17] = {
+  Value(0),
+  PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
+  RookValueMidgame, QueenValueMidgame,
+  Value(0), Value(0), Value(0),
+  PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
+  RookValueMidgame, QueenValueMidgame,
+  Value(0), Value(0), Value(0)
+};
+
+const Value PieceValueEndgame[17] = {
+  Value(0),
+  PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
+  RookValueEndgame, QueenValueEndgame,
+  Value(0), Value(0), Value(0),
+  PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
+  RookValueEndgame, QueenValueEndgame,
+  Value(0), Value(0), Value(0)
+};
+
+/// Bonus for having the side to move
+
+const Value TempoValueMidgame = Value(50);
+const Value TempoValueEndgame = Value(20);
+
+
+////
+//// Inline functions
+////
+
+inline Value operator+ (Value v, int i) { return Value(int(v) + i); }
+inline Value operator+ (Value v1, Value v2) { return Value(int(v1) + int(v2)); }
+inline void operator+= (Value &v1, Value v2) {
+  v1 = Value(int(v1) + int(v2));
+}
+inline Value operator- (Value v, int i) { return Value(int(v) - i); }
+inline Value operator- (Value v) { return Value(-int(v)); }
+inline Value operator- (Value v1, Value v2) { return Value(int(v1) - int(v2)); }
+inline void operator-= (Value &v1, Value v2) {
+  v1 = Value(int(v1) - int(v2));
+}
+inline Value operator* (Value v, int i) { return Value(int(v) * i); }
+inline void operator*= (Value &v, int i) { v = Value(int(v) * i); }
+inline Value operator* (int i, Value v) { return Value(int(v) * i); }
+inline Value operator/ (Value v, int i) { return Value(int(v) / i); }
+inline void operator/= (Value &v, int i) { v = Value(int(v) / i); }
+
+
+inline Value value_mate_in(int ply) {
+  return Value(VALUE_MATE - Value(ply));
+}
+               
+inline Value value_mated_in(int ply) {
+  return Value(-VALUE_MATE + Value(ply));
+}
+
+inline bool is_upper_bound(ValueType vt) {
+  return (int(vt) & int(VALUE_TYPE_UPPER)) != 0;
+}
+
+inline bool is_lower_bound(ValueType vt) {
+  return (int(vt) & int(VALUE_TYPE_LOWER)) != 0;
+}
+
+inline Value piece_value_midgame(PieceType pt) {
+  return PieceValueMidgame[pt];
+}
+
+inline Value piece_value_endgame(PieceType pt) {
+  return PieceValueEndgame[pt];
+}
+
+inline Value piece_value_midgame(Piece p) {
+  return PieceValueMidgame[p];
+}
+
+inline Value piece_value_endgame(Piece p) {
+  return PieceValueEndgame[p];
+}
+
+
+////
+//// Prototypes
+////
+
+extern Value value_to_tt(Value v, int ply);
+extern Value value_from_tt(Value v, int ply);
+extern int value_to_centipawns(Value v);
+extern Value value_from_centipawns(int cp);
+extern const std::string value_to_string(Value v);
+
+
+#endif // !defined(VALUE_H_INCLUDED)