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engines/groovie/logic/othello.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program 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.
+ *
+ * This program 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/>.
+ *
+ *
+ * This file is dual-licensed.
+ * In addition to the GPLv3 license mentioned above, MojoTouch has exclusively licensed
+ * this code on November 10th, 2021, to be use in closed-source products.
+ * Therefore, any contributions (commits) to it will also be dual-licensed.
+ *
+ */
+
+#ifndef GROOVIE_LOGIC_OTHELLO_H
+#define GROOVIE_LOGIC_OTHELLO_H
+
+#include "common/random.h"
+#include "common/system.h"
+
+namespace Groovie {
+
+/*
+ * Othello/Reversi Cursed Coins puzzle in Clandestiny and UHP.
+ */
+struct Freeboard {
+	int _score;
+	byte _boardstate[8][8]; // 0 is empty, 1 is player, 2 is AI
+
+	// for sorting an array of pointers
+	friend bool operator<(const Freeboard &a, const Freeboard &b) {
+		return a._score > b._score;
+	}
+};
+
+class OthelloGame {
+public:
+	OthelloGame(bool easierAi);
+	void run(byte *scriptVariables);
+
+private:
+	int scoreEdge(byte (&board)[8][8], int x, int y, int slopeX, int slopeY);
+	int scoreEarlyGame(Freeboard *freeboard);
+	int scoreLateGame(Freeboard *freeboard);
+	int scoreBoard(Freeboard *board);
+	void restart(void);
+	void writeBoardToVars(Freeboard *board, byte *vars);
+	void readBoardStateFromVars(byte *vars);
+	Freeboard getPossibleMove(Freeboard *freeboard, int moveSpot);
+	void checkPossibleMove(Freeboard *board, Freeboard (&boards)[30], int8 **lineSpot, int &numPossibleMoves, int moveSpot, byte player, byte opponent);
+	int getAllPossibleMoves(Freeboard *board, Freeboard (&boards)[30]);
+	int aiRecurse(Freeboard *board, int depth, int parentScore, int opponentBestScore);
+	byte aiDoBestMove(Freeboard *pBoard);
+	void initLines(void);
+	uint makeMove(Freeboard *freeboard, uint8 x, uint8 y);
+	byte getLeader(Freeboard *f);
+	void opInit(byte *vars);
+	void tickBoard();
+	void opPlayerMove(byte *vars);
+	void op3(byte *vars);
+	void opAiMove(byte *vars);
+	void op5(byte *vars);
+
+	void test();
+	void testMatch(Common::Array<int> moves, bool playerWin);
+
+	Common::RandomSource _random;
+	byte _flag1;
+	int8 _flag2;
+	const int _depths[60];
+	int _counter;
+	const int _movesLateGame;    // this is 52, seems to be a marker of when to change the function pointer to an aleternate scoring algorithm for the late game
+	bool _isLateGame;      // used to choose the scoring function, true means scoreLateGame
+	const int8 _lookupPlayer[3]; // used to convert from internal values that represent piece colors to what the script uses in vars, {21, 40, 31}
+	const int8 _scores[3][4];
+	const int8 _edgesScores[112];
+	const int _cornersScores[105];
+	int _isAiTurn;
+	int8 **_lines[64];
+	int8 *_linesStorage[484];
+	int8 _lineStorage[2016];
+	Freeboard _board;
+	bool _easierAi;
+};
+
+} // End of Groovie namespace
+
+#endif // GROOVIE_LOGIC_OTHELLO_H