/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+ Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#define MATERIAL_H_INCLUDED
#include "endgame.h"
+#include "misc.h"
#include "position.h"
-#include "tt.h"
#include "types.h"
const int MaterialTableSize = 8192;
-/// MaterialInfo is a class which contains various information about a
+/// Game phase
+enum Phase {
+ PHASE_ENDGAME = 0,
+ PHASE_MIDGAME = 128
+};
+
+
+/// MaterialEntry is a class which contains various information about a
/// material configuration. It contains a material balance evaluation,
/// a function pointer to a special endgame evaluation function (which in
/// most cases is NULL, meaning that the standard evaluation function will
/// For instance, in KRB vs KR endgames, the score is scaled down by a factor
/// of 4, which will result in scores of absolute value less than one pawn.
-class MaterialInfo {
+class MaterialEntry {
- friend class MaterialInfoTable;
+ friend struct MaterialTable;
public:
Score material_value() const;
Key key;
int16_t value;
uint8_t factor[2];
- EndgameEvaluationFunctionBase* evaluationFunction;
- EndgameScalingFunctionBase* scalingFunction[2];
+ EndgameBase<Value>* evaluationFunction;
+ EndgameBase<ScaleFactor>* scalingFunction[2];
int spaceWeight;
Phase gamePhase;
};
-/// The MaterialInfoTable class represents a pawn hash table. The most important
-/// method is get_material_info, which returns a pointer to a MaterialInfo object.
-class EndgameFunctions;
+/// The MaterialTable class represents a material hash table. The most important
+/// method is probe(), which returns a pointer to a MaterialEntry object.
-class MaterialInfoTable : public SimpleHash<MaterialInfo, MaterialTableSize> {
-public:
- MaterialInfoTable();
- ~MaterialInfoTable();
- MaterialInfo* get_material_info(const Position& pos) const;
- static Phase game_phase(const Position& pos);
+struct MaterialTable {
-private:
- template<Color Us>
- static int imbalance(const int pieceCount[][8]);
+ MaterialEntry* probe(const Position& pos);
+ static Phase game_phase(const Position& pos);
+ template<Color Us> static int imbalance(const int pieceCount[][8]);
- EndgameFunctions* funcs;
+ HashTable<MaterialEntry, MaterialTableSize> entries;
+ Endgames endgames;
};
-/// MaterialInfo::scale_factor takes a position and a color as input, and
+/// MaterialEntry::scale_factor takes a position and a color as input, and
/// returns a scale factor for the given color. We have to provide the
/// position in addition to the color, because the scale factor need not
/// to be a constant: It can also be a function which should be applied to
/// the position. For instance, in KBP vs K endgames, a scaling function
/// which checks for draws with rook pawns and wrong-colored bishops.
-inline ScaleFactor MaterialInfo::scale_factor(const Position& pos, Color c) const {
+inline ScaleFactor MaterialEntry::scale_factor(const Position& pos, Color c) const {
if (!scalingFunction[c])
return ScaleFactor(factor[c]);
- ScaleFactor sf = scalingFunction[c]->apply(pos);
+ ScaleFactor sf = (*scalingFunction[c])(pos);
return sf == SCALE_FACTOR_NONE ? ScaleFactor(factor[c]) : sf;
}
-inline Score MaterialInfo::material_value() const {
+inline Value MaterialEntry::evaluate(const Position& pos) const {
+ return (*evaluationFunction)(pos);
+}
+
+inline Score MaterialEntry::material_value() const {
return make_score(value, value);
}
-inline int MaterialInfo::space_weight() const {
+inline int MaterialEntry::space_weight() const {
return spaceWeight;
}
-inline Phase MaterialInfo::game_phase() const {
+inline Phase MaterialEntry::game_phase() const {
return gamePhase;
}
-inline bool MaterialInfo::specialized_eval_exists() const {
+inline bool MaterialEntry::specialized_eval_exists() const {
return evaluationFunction != NULL;
}
-inline Value MaterialInfo::evaluate(const Position& pos) const {
- return evaluationFunction->apply(pos);
-}
-
#endif // !defined(MATERIAL_H_INCLUDED)