cd82964e5d
+ some changes that will be needed for more advanced AIs (which aren't ready to commit yet) git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13758 a1c6a512-1295-4272-9138-f99709370657
118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (c) 2007 Antoine Cellerier
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "reversi-strategy.h"
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/**
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* Simple strategy:
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* A very simple strategy. Makes the highest scoring move taking the other
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* player's next best move into account.
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* From Algorithm by Claudio Clemens in hinversi, simpleClient.c
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*/
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static void reversi_copy_board(reversi_board_t *dst,
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const reversi_board_t *src) {
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int i;
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dst->rb = src->rb;
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dst->rb->memcpy(dst->history,src->history,
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(BOARD_SIZE*BOARD_SIZE - INIT_STONES)*sizeof(move_t));
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for(i=0;i<BOARD_SIZE;i++) {
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dst->rb->memcpy(dst->board[i],src->board[i],BOARD_SIZE*sizeof(int));
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}
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}
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static int reversi_sim_move(const reversi_board_t *game, const int row,
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const int col, const int player) {
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reversi_board_t game_clone;
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reversi_copy_board(&game_clone,game);
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return reversi_make_move(&game_clone,row,col,player);
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}
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static int reversi_get_max_moves(const reversi_board_t *game, int player) {
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int max = -BOARD_SIZE*BOARD_SIZE;
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int row, col;
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for(row=0; row<BOARD_SIZE; row++) {
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for(col=0; col<BOARD_SIZE; col++) {
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int v = reversi_sim_move(game,row,col,player);
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if(v>max)
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max = v;
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}
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}
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return max;
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}
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static int reversi_sim_move2(const reversi_board_t *game, const int row,
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const int col, const int player) {
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/* Takes the other player's next best move into account */
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int score;
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reversi_board_t game_clone;
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reversi_copy_board(&game_clone,game);
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score = reversi_make_move(&game_clone,row,col,player);
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return score - reversi_get_max_moves(&game_clone,
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reversi_flipped_color(player));
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}
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static move_t simple_move_func(const reversi_board_t *game, int player) {
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int max = -BOARD_SIZE*BOARD_SIZE;
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int count = 0;
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int row, col;
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int r;
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for(row=0; row<BOARD_SIZE; row++) {
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for(col=0; col<BOARD_SIZE; col++) {
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int v = reversi_sim_move2(game,row,col,player);
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if(v>max) {
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max = v;
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count = 1;
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}
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else if(v==max) {
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count ++;
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}
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}
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}
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if(!count) return MOVE_INVALID;
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/* chose one of the moves which scores highest */
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r = game->rb->rand()%count;
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row = 0;
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col = 0;
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while(true) {
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if(reversi_sim_move2(game, row, col, player)==max) {
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r--;
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if(r<0) {
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return MAKE_MOVE(row,col,player);
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}
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}
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col ++;
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if(col==BOARD_SIZE) {
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col = 0;
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row ++;
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if(row==BOARD_SIZE) {
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row = 0;
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}
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}
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}
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}
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const game_strategy_t strategy_simple = {
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true,
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NULL,
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simple_move_func
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};
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