rockbox/apps/plugins/chessbox/chessbox.c

/***************************************************************************
*             __________               __   ___.
*   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
*   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
*   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
*   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
*                     \/            \/     \/    \/            \/
* $Id$
*
* Copyright (C) 2006 Miguel A. Ar<EFBFBD>valo 
* Color graphics from eboard
* GNUChess v2 chess engine Copyright (c) 1988  John Stanback
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
 
#include "plugin.h"

#ifdef HAVE_LCD_BITMAP

#include "gnuchess.h"
#include "opening.h"

/* type definitions */
struct cb_command {
    int type;
    char mv_s[5];
    unsigned short mv;
};

/* External bitmaps */
extern const fb_data chessbox_pieces[];


PLUGIN_HEADER

/* button definitions */
#if (CONFIG_KEYPAD == IPOD_3G_PAD) || (CONFIG_KEYPAD == IPOD_4G_PAD)
#define CB_SELECT  BUTTON_SELECT
#define CB_UP      BUTTON_MENU
#define CB_DOWN    BUTTON_PLAY
#define CB_LEFT    BUTTON_LEFT
#define CB_RIGHT   BUTTON_RIGHT
#define CB_PLAY    (BUTTON_SELECT | BUTTON_PLAY)
#define CB_LEVEL   (BUTTON_SELECT | BUTTON_RIGHT)
#define CB_RESTART (BUTTON_SELECT | BUTTON_LEFT)
#define CB_QUIT    (BUTTON_SELECT | BUTTON_MENU)

#elif CONFIG_KEYPAD == IAUDIO_X5_PAD
#define CB_SELECT  BUTTON_SELECT
#define CB_UP      BUTTON_UP
#define CB_DOWN    BUTTON_DOWN
#define CB_LEFT    BUTTON_LEFT
#define CB_RIGHT   BUTTON_RIGHT
#define CB_PLAY    BUTTON_PLAY
#define CB_LEVEL   BUTTON_REC
#define CB_RESTART (BUTTON_SELECT | BUTTON_PLAY)
#define CB_QUIT    BUTTON_POWER

#elif (CONFIG_KEYPAD == IRIVER_H100_PAD) || (CONFIG_KEYPAD == IRIVER_H300_PAD)
#define CB_SELECT  BUTTON_SELECT
#define CB_UP      BUTTON_UP
#define CB_DOWN    BUTTON_DOWN
#define CB_LEFT    BUTTON_LEFT
#define CB_RIGHT   BUTTON_RIGHT
#define CB_PLAY    BUTTON_ON
#define CB_LEVEL   BUTTON_MODE
#define CB_RESTART BUTTON_REC
#define CB_QUIT    BUTTON_OFF

#define CB_RC_QUIT BUTTON_RC_STOP

#elif CONFIG_KEYPAD == IRIVER_IFP7XX_PAD
#define CB_SELECT  BUTTON_SELECT
#define CB_UP      BUTTON_UP
#define CB_DOWN    BUTTON_DOWN
#define CB_LEFT    BUTTON_LEFT
#define CB_RIGHT   BUTTON_RIGHT
#define CB_PLAY    BUTTON_PLAY
#define CB_LEVEL   BUTTON_EQ
#define CB_QUIT    BUTTON_MODE

#elif CONFIG_KEYPAD == RECORDER_PAD
#define CB_SELECT  BUTTON_PLAY
#define CB_UP      BUTTON_UP
#define CB_DOWN    BUTTON_DOWN
#define CB_LEFT    BUTTON_LEFT
#define CB_RIGHT   BUTTON_RIGHT
#define CB_PLAY    BUTTON_ON
#define CB_LEVEL   BUTTON_F1
#define CB_RESTART BUTTON_F3
#define CB_QUIT    BUTTON_OFF

#elif CONFIG_KEYPAD == ONDIO_PAD
#define CB_SELECT_PRE BUTTON_MENU
#define CB_SELECT  (BUTTON_MENU|BUTTON_REL)
#define CB_UP      BUTTON_UP
#define CB_DOWN    BUTTON_DOWN
#define CB_LEFT    BUTTON_LEFT
#define CB_RIGHT   BUTTON_RIGHT
#define CB_PLAY_PRE BUTTON_MENU
#define CB_PLAY    (BUTTON_MENU|BUTTON_REPEAT)
#define CB_LEVEL   (BUTTON_MENU|BUTTON_OFF)
#define CB_RESTART (BUTTON_MENU|BUTTON_LEFT)
#define CB_QUIT    BUTTON_OFF

#elif (CONFIG_KEYPAD == GIGABEAT_PAD)
#define CB_SELECT  BUTTON_SELECT
#define CB_UP      BUTTON_UP
#define CB_DOWN    BUTTON_DOWN
#define CB_LEFT    BUTTON_LEFT
#define CB_RIGHT   BUTTON_RIGHT
#define CB_PLAY    BUTTON_POWER
#define CB_LEVEL   BUTTON_MENU
#define CB_QUIT    BUTTON_A

#elif CONFIG_KEYPAD == IRIVER_H10_PAD
#define CB_SELECT  BUTTON_REW
#define CB_UP      BUTTON_SCROLL_UP
#define CB_DOWN    BUTTON_SCROLL_DOWN
#define CB_LEFT    BUTTON_LEFT
#define CB_RIGHT   BUTTON_RIGHT
#define CB_PLAY    BUTTON_PLAY
#define CB_LEVEL   BUTTON_FF
#define CB_RESTART (BUTTON_REW | BUTTON_PLAY)
#define CB_QUIT    BUTTON_POWER

#elif CONFIG_KEYPAD == SANSA_E200_PAD
#define CB_SELECT  BUTTON_SELECT
#define CB_UP      BUTTON_UP
#define CB_DOWN    BUTTON_DOWN
#define CB_LEFT    BUTTON_LEFT
#define CB_RIGHT   BUTTON_RIGHT
#define CB_PLAY    (BUTTON_SELECT | BUTTON_RIGHT)
#define CB_LEVEL   BUTTON_REC
#define CB_RESTART (BUTTON_SELECT | BUTTON_REPEAT)
#define CB_QUIT    BUTTON_POWER

#else
    #error CHESSBOX: Unsupported keypad
#endif

/* use 30x30 tiles */
#if (LCD_HEIGHT >= 240) && (LCD_WIDTH >= 240)
#define TILE_WIDTH  30
#define TILE_HEIGHT 30
/* use 22x22 tiles */
#elif (LCD_HEIGHT >= 176) && (LCD_WIDTH >= 176)
#define TILE_WIDTH  22
#define TILE_HEIGHT 22
/* use 16x16 tiles */
#elif (LCD_HEIGHT >= 128) && (LCD_WIDTH >= 128)
#define TILE_WIDTH  16
#define TILE_HEIGHT 16
/* use 13x13 tiles */
#elif (LCD_HEIGHT >= 104) && (LCD_WIDTH >= 104)
#define TILE_WIDTH  13
#define TILE_HEIGHT 13
/* use 10x8 tiles , only for the archoses */
#elif (LCD_HEIGHT == 64) && (LCD_WIDTH == 112)
#define TILE_WIDTH  10
#define TILE_HEIGHT 8
/* use 8x8 tiles */
#elif (LCD_HEIGHT >= 64) && (LCD_WIDTH >= 64)
#define TILE_WIDTH  8
#define TILE_HEIGHT 8
#else
    #error CHESSBOX: Unsupported LCD
#endif

/* Calculate Offsets */
#define XOFS ((LCD_WIDTH-8*TILE_WIDTH)/2)
#define YOFS ((LCD_HEIGHT-8*TILE_HEIGHT)/2)

/* save files */
#define SAVE_FILE  PLUGIN_DIR "/chessbox.save"

/* commands enum */
#define COMMAND_NOP        0
#define COMMAND_MOVE       1
#define COMMAND_PLAY       2
#define COMMAND_LEVEL      3
#ifdef CB_RESTART
    #define COMMAND_RESTART    4
#endif
#define COMMAND_QUIT       5

/* level+1's string */
const char *level_string[] = { "Level 1: 60 moves / 5 min" ,
                        "Level 2: 60 moves / 15 min" , 
                        "Level 3: 60 moves / 30 min" ,
                        "Level 4: 40 moves / 30 min" ,
                        "Level 5: 40 moves / 60 min" ,
                        "Level 6: 40 moves / 120 min" ,
                        "Level 7: 40 moves / 240 min" ,
                        "Level 8: 1 move / 15 min" ,
                        "Level 9: 1 move / 60 min" ,
                        "Level 10: 1 move / 600 min" };

/* "While thinking" command */
int wt_command = COMMAND_NOP;

/* GCC wants this to be present for some targets */
void* memcpy(void* dst, const void* src, size_t size)
{
    return rb->memcpy(dst, src, size);
}

/* ---- Get the board column and row (e2 f.e.) for a physical x y ---- */
void xy2cr ( short x, short y, short *c, short *r ) {
    if (computer == black ) {
        *c = x ;
        *r = y ;
    } else {
        *c = 7 - x ;
        *r = 7 - y ;
    }
}

/* ---- get physical x y for a board column and row (e2 f.e.) ---- */
void cr2xy ( short c, short r, short *x, short *y ) {
    if ( computer == black ) {
        *x = c ;
        *y = r ;
    } else {
        *x = 7 - c ;
        *y = 7 - r ;
    }
}

/* ---- Draw a complete board ---- */
static void cb_drawboard (void) {
    short r , c , x , y ;
    short l , piece , p_color ;
    int b_color=1;
    
    rb->lcd_clear_display();

    for (r = 0; r < 8; r++) {
        for (c = 0; c < 8; c++) {
            l = locn[r][c];
            piece   = board[l] ;
            p_color = color[l] ;
            cr2xy ( c , r , &x , &y );
            if ( piece == no_piece ) {
                rb->lcd_bitmap_part ( chessbox_pieces , 0 ,
                                      TILE_HEIGHT * b_color ,
                                      TILE_WIDTH ,
                                      XOFS + x*TILE_WIDTH ,
                                      YOFS + ( 7 - y )*TILE_HEIGHT ,
                                      TILE_WIDTH ,
                                      TILE_HEIGHT );
            } else {
                rb->lcd_bitmap_part ( chessbox_pieces ,
                                      0 ,
                                      2 * TILE_HEIGHT +
                                          4 * TILE_HEIGHT * ( piece - 1 ) +
                                          2 * TILE_HEIGHT * p_color +
                                          TILE_HEIGHT * b_color ,
                                      TILE_WIDTH ,
                                      XOFS + x*TILE_WIDTH ,
                                      YOFS + (7 - y)*TILE_HEIGHT ,
                                      TILE_WIDTH ,
                                      TILE_HEIGHT );
            }
            b_color = (b_color == 1) ? 0 : 1 ;
        }
        b_color = (b_color == 1) ? 0 : 1 ;
    }
    
    /* draw board limits */
#if (LCD_WIDTH > TILE_WIDTH*8) && (LCD_HEIGHT > TILE_HEIGHT*8)
    rb->lcd_drawrect(XOFS - 1, YOFS - 1, TILE_WIDTH*8 + 2, TILE_HEIGHT*8 + 2);
#elif LCD_WIDTH > TILE_WIDTH*8
    rb->lcd_vline(XOFS - 1, 0, LCD_HEIGHT - 1);
    rb->lcd_vline(XOFS + 8*TILE_WIDTH, 0, LCD_HEIGHT - 1);
#elif LCD_HEIGHT > TILE_HEIGHT*8
    rb->lcd_hline(0, LCD_WIDTH - 1, YOFS - 1);
    rb->lcd_hline(0, LCD_WIDTH - 1, YOFS + TILE_HEIGHT*8);
#endif

    rb->lcd_update();
}

/* ---- Switch mark on board ---- */
void cb_switch ( short x , short y ) {
    rb->lcd_set_drawmode ( DRMODE_COMPLEMENT );
    rb->lcd_drawrect ( XOFS + x*TILE_WIDTH + 1 ,
                       YOFS + ( 7 - y )*TILE_HEIGHT +1 ,
                       TILE_WIDTH-2 , TILE_HEIGHT-2 );
    rb->lcd_update();
    rb->lcd_set_drawmode ( DRMODE_SOLID );
}

/* ---- callback for capturing interaction while thinking ---- */
void cb_wt_callback ( void ) {
    int button = BUTTON_NONE;
    
    wt_command = COMMAND_NOP;
    button = rb->button_get(false);
    switch (button) {
#ifdef CB_RC_QUIT
        case CB_RC_QUIT:
#endif
        case CB_QUIT:
            wt_command = COMMAND_QUIT;
            timeout = true;
            break;
        case CB_PLAY:
            wt_command = COMMAND_PLAY;
            timeout = true;
            break;
    }
}

/* ---- set playing parameters depending on level ---- */
void cb_setlevel ( int lev ) {
    Level = (lev > 7) ? 7 : ( (lev < 1) ? 1 : lev ) ;
    switch (Level) {
        case 1 :
            TCmoves = 60;
            TCminutes = 5;
            break;
        case 2 :
            TCmoves = 60;
            TCminutes = 15;
            break;
        case 3 :
            TCmoves = 60;
            TCminutes = 30;
            break;
        case 4 :
            TCmoves = 40;
            TCminutes = 30;
            break;
        case 5 :
            TCmoves = 40;
            TCminutes = 60;
            break;
        case 6 :
            TCmoves = 40;
            TCminutes = 120;
            break;
        case 7 :
            TCmoves = 40;
            TCminutes = 240;
            break;
        case 8 :
            TCmoves = 1;
            TCminutes = 15;
            break;
          case 9 :
            TCmoves = 1;
            TCminutes = 60;
            break;
          case 10 :
            TCmoves = 1;
            TCminutes = 600;
            break;
    }
    TCflag = (TCmoves > 1);
    SetTimeControl();
}

/* ---- increase playing level ---- */
void cb_levelup ( void ) {
    if ( Level == 7 )
        cb_setlevel ( 1 );
    else
        cb_setlevel ( Level+1 );
    rb->splash ( 50 , true , level_string[Level-1] );
};

/* ---- Save current position ---- */
void cb_saveposition ( void ) {
    int fd;
    short sq,i,c;
    unsigned short temp;
    
    rb->splash ( 0 , true , "Saving position" );

    fd = rb->open(SAVE_FILE, O_WRONLY|O_CREAT);

    computer++; rb->write(fd, &(computer), sizeof(computer)); computer--;
    opponent++; rb->write(fd, &(opponent), sizeof(opponent)); opponent--;
    rb->write(fd, &(Game50), sizeof(Game50));

    rb->write(fd, &(castld[white]), sizeof(castld[white]));
    rb->write(fd, &(castld[black]), sizeof(castld[black]));
    rb->write(fd, &(kingmoved[white]), sizeof(kingmoved[white]));
    rb->write(fd, &(kingmoved[black]), sizeof(kingmoved[black]));

    rb->write(fd, &(withbook), sizeof(withbook));
    rb->write(fd, &(Level), sizeof(Level));
    rb->write(fd, &(TCflag), sizeof(TCflag));
    rb->write(fd, &(OperatorTime), sizeof(OperatorTime));

    rb->write(fd, &(TimeControl.clock[white]),
              sizeof(TimeControl.clock[white]) );
    rb->write(fd, &(TimeControl.clock[black]),
              sizeof(TimeControl.clock[black]) );
    rb->write(fd, &(TimeControl.moves[white]),
              sizeof(TimeControl.moves[white]) );
    rb->write(fd, &(TimeControl.moves[black]),
              sizeof(TimeControl.moves[black]) );
    for (sq = 0; sq < 64; sq++) {
        if (color[sq] == neutral) c = 0; else c = color[sq]+1;
        temp = 256*board[sq] + c ;
        rb->write(fd, &(temp), sizeof(temp));
    }
    for (i = 0; i <= GameCnt; i++) {
        if (GameList[i].color == neutral)
            c = 0;
        else
            c = GameList[i].color + 1;
        rb->write(fd, &(GameList[i].gmove), sizeof(GameList[i].gmove));
        rb->write(fd, &(GameList[i].score), sizeof(GameList[i].score));
        rb->write(fd, &(GameList[i].depth), sizeof(GameList[i].depth));
        rb->write(fd, &(GameList[i].nodes), sizeof(GameList[i].nodes));
        rb->write(fd, &(GameList[i].time), sizeof(GameList[i].time));
        rb->write(fd, &(GameList[i].piece), sizeof(GameList[i].piece));
        rb->write(fd, &(c), sizeof(c));
    }
    rb->close(fd);
}

/* ---- Restore saved position ---- */
void cb_restoreposition ( void ) {
    int fd;
    int c;
    short sq;
    unsigned short m;
    
    if ( (fd = rb->open(SAVE_FILE, O_RDONLY)) >= 0 ) {
        rb->splash ( 0 , true , "Loading position" );
        rb->read(fd, &(computer), sizeof(computer));
        rb->read(fd, &(opponent), sizeof(opponent));
        rb->read(fd, &(Game50), sizeof(Game50));

        rb->read(fd, &(castld[white]), sizeof(castld[white]));
        rb->read(fd, &(castld[black]), sizeof(castld[black]));
        rb->read(fd, &(kingmoved[white]), sizeof(kingmoved[white]));
        rb->read(fd, &(kingmoved[black]), sizeof(kingmoved[black]));

        rb->read(fd, &(withbook), sizeof(withbook));
        rb->read(fd, &(Level), sizeof(Level));
        rb->read(fd, &(TCflag), sizeof(TCflag));
        rb->read(fd, &(OperatorTime), sizeof(OperatorTime));

        rb->read(fd, &(TimeControl.clock[white]),
                 sizeof(TimeControl.clock[white]));
        rb->read(fd, &(TimeControl.clock[black]),
                 sizeof(TimeControl.clock[black]));
        rb->read(fd, &(TimeControl.moves[white]),
                 sizeof(TimeControl.moves[white]));
        rb->read(fd, &(TimeControl.moves[black]),
                 sizeof(TimeControl.moves[black]));
        for (sq = 0; sq < 64; sq++) {
            rb->read(fd, &(m), sizeof(m));
            board[sq] = (m >> 8); color[sq] = (m & 0xFF);
            if (color[sq] == 0)
                color[sq] = neutral;
            else
                --color[sq];
        }
        GameCnt = -1; c = '?';
        while (rb->read(fd, &(GameList[++GameCnt].gmove),
                        sizeof(GameList[GameCnt].gmove)) > 0) {
            rb->read(fd, &(GameList[GameCnt].score),
                     sizeof(GameList[GameCnt].score));
            rb->read(fd, &(GameList[GameCnt].depth),
                     sizeof(GameList[GameCnt].depth));
            rb->read(fd, &(GameList[GameCnt].nodes),
                     sizeof(GameList[GameCnt].nodes));
            rb->read(fd, &(GameList[GameCnt].time),
                     sizeof(GameList[GameCnt].time));
            rb->read(fd, &(GameList[GameCnt].piece),
                     sizeof(GameList[GameCnt].piece));
            rb->read(fd, &(GameList[GameCnt].color),
                         sizeof(GameList[GameCnt].color));
            if (GameList[GameCnt].color == 0)
                GameList[GameCnt].color = neutral;
            else
                --GameList[GameCnt].color;
        }
        GameCnt--;
        if (TimeControl.clock[white] > 0)
            TCflag = true;
        computer--; opponent--;
    }
    rb->close(fd);
    cb_setlevel(Level);
    InitializeStats();
    Sdepth = 0;
}

/* ---- main user loop ---- */
struct cb_command cb_getcommand (void) {
    static short x = 4 , y = 3 ;
    short c , r , l;
    int button, lastbutton = BUTTON_NONE;
    int marked = false , from_marked = false ;
    short marked_x = 0 , marked_y = 0 ;
    struct cb_command result = { 0, {0,0,0,0,0}, 0 };
    
    cb_switch ( x , y );
    /* main loop */
    while ( true ) {
        button = rb->button_get(true);
        switch (button) {
#ifdef CB_RC_QUIT
            case CB_RC_QUIT:
#endif
            case CB_QUIT:
                result.type = COMMAND_QUIT;
                return result;
#ifdef CB_RESTART
            case CB_RESTART:
                result.type = COMMAND_RESTART;
                return result;
#endif
            case CB_LEVEL:
                result.type = COMMAND_LEVEL;
                return result;
            case CB_PLAY:
#ifdef CB_PLAY_PRE
                if (lastbutton != CB_PLAY_PRE)
                    break;
#endif
                result.type = COMMAND_PLAY;
                return result;
            case CB_UP:
                if ( !from_marked ) cb_switch ( x , y );
                y++;
                if ( y == 8 ) {
                    y = 0;
                    x--;
                    if ( x < 0 ) x = 7;
                }
                if ( marked && ( marked_x == x ) && ( marked_y == y ) ) {
                    from_marked = true ;
                } else {
                    from_marked = false ;
                    cb_switch ( x , y );
                }
                break;
            case CB_DOWN:
                if ( !from_marked ) cb_switch ( x , y );
                y--;
                if ( y < 0 ) {
                    y = 7;
                    x++;
                    if ( x == 8 ) x = 0;
                }
                if ( marked && ( marked_x == x ) && ( marked_y == y ) ) {
                    from_marked = true ;
                } else {
                    from_marked = false ;
                    cb_switch ( x , y );
                }
                break;
            case CB_LEFT:
                if ( !from_marked ) cb_switch ( x , y );
                x--;
                if ( x < 0 ) {
                    x = 7;
                    y++;
                    if ( y == 8 ) y = 0;
                }
                if ( marked && ( marked_x == x ) && ( marked_y == y ) ) {
                    from_marked = true ;
                } else {
                    from_marked = false ;
                    cb_switch ( x , y );
                }
                break;
            case CB_RIGHT:
                if ( !from_marked ) cb_switch ( x , y );
                x++;
                if ( x == 8 ) {
                    x = 0;
                    y--;
                    if ( y < 0 ) y = 7;
                }
                if ( marked && ( marked_x == x ) && ( marked_y == y ) ) {
                    from_marked = true ;
                } else {
                    from_marked = false ;
                    cb_switch ( x , y );
                }
                break;
            case CB_SELECT:
#ifdef CB_SELECT_PRE
                if (lastbutton != CB_SELECT_PRE)
                    break;
#endif
                if ( !marked ) {
                    xy2cr ( x , y , &c , &r );
                    l = locn[r][c];
                    if ( ( color[l]!=computer ) && ( board[l]!=no_piece ) ) {
                        marked = true;
                        from_marked = true ;
                        marked_x = x;
                        marked_y = y;
                    }
                } else {
                    if ( ( marked_x == x ) && ( marked_y == y ) ) {
                        marked = false;
                        from_marked = false;
                    } else {
                        xy2cr ( marked_x , marked_y , &c , &r );
                        result.mv_s[0] = 'a' + c;
                        result.mv_s[1] = '1' + r;
                        xy2cr ( x , y , &c , &r );
                        result.mv_s[2] = 'a' + c;
                        result.mv_s[3] = '1' + r;
                        result.mv_s[4] = '\00';
                        result.type = COMMAND_MOVE;
                        return result;
                    }
                }
                break;
        }
        if (button != BUTTON_NONE)
            lastbutton = button;
    }

}

/*****************************************************************************
* plugin entry point.
******************************************************************************/
enum plugin_status plugin_start(struct plugin_api* api, void* parameter) {
    struct cb_command command;
    /* init status */
    bool exit = false;
    
    /* plugin init */
    (void)parameter;
    rb = api;
#if LCD_DEPTH > 1
    rb->lcd_set_backdrop(NULL);
#endif
    /* end of plugin init */

    /* load opening book, soon */

    /* init board */
    GNUChess_Initialize();
    
    /* restore saved position, if saved */
    cb_restoreposition();
    
    /* draw the board */
    /* I don't like configscreens, start game inmediatly */
    cb_drawboard();
    
    while (!exit) {
        if ( mate ) {
            rb->splash ( 500 , true , "Checkmate!" );
            rb->button_get(true);
            GNUChess_Initialize();
            cb_drawboard();
        }
        command = cb_getcommand ();
        switch (command.type) {
            case COMMAND_MOVE:
                if ( ! VerifyMove ( command.mv_s , 0 , &command.mv ) ) {
                    rb->splash ( 50 , true , "Illegal move!" );
                    cb_drawboard();
                } else {
                    cb_drawboard();
                    rb->splash ( 0 , true , "Thinking..." );
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
                    rb->cpu_boost ( true );
#endif
                    SelectMove ( computer , 0 , cb_wt_callback );
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
                    rb->cpu_boost ( false );
#endif
                    if ( wt_command == COMMAND_QUIT ) {
                        exit = true;
                        break;
                    }
                    cb_drawboard();
                }
                break;
#ifdef COMMAND_RESTART
            case COMMAND_RESTART:
                GNUChess_Initialize();
                cb_drawboard();
                break;
#endif
            case COMMAND_PLAY:
                opponent = !opponent; computer = !computer;
                rb->splash ( 0 , true , "Thinking..." );
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
                rb->cpu_boost ( true );
#endif
                SelectMove ( computer , 0 , cb_wt_callback );
#ifdef HAVE_ADJUSTABLE_CPU_FREQ
                rb->cpu_boost ( false );
#endif
                if ( wt_command == COMMAND_QUIT ) {
                    exit = true;
                    break;
                }
                cb_drawboard();
                break;
            case COMMAND_LEVEL:
                cb_levelup ( );
                cb_drawboard();
                break;
            case COMMAND_QUIT:
                exit = true;
                break;
        }
    }
    
    cb_saveposition();
    rb->lcd_setfont(FONT_UI);
    return PLUGIN_OK;
}

#endif /* HAVE_LCD_BITMAP */