apps/plugins/mazezam.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  *
   9  * Copyright (C) 2006, 2008 Malcolm Tyrrell
  10  *
  11  * MazezaM - a Rockbox version of my ZX Spectrum game from 2002
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ****************************************************************************/
  22 #include "plugin.h"
  23 #include "lib/configfile.h"
  24 #include "lib/helper.h"
  25 #include "lib/playback_control.h"
  26
  27 /* Include standard plugin macro */
  28
  29
  30 #if (CONFIG_KEYPAD == IPOD_3G_PAD)
  31 #   define MAZEZAM_MENU    BUTTON_MENU
  32 #   define MAZEZAM_RIGHT   BUTTON_RIGHT
  33 #   define MAZEZAM_LEFT    BUTTON_LEFT
  34 #   define MAZEZAM_UP      BUTTON_SCROLL_BACK
  35 #   define MAZEZAM_DOWN    BUTTON_SCROLL_FWD
  36 #   define MAZEZAM_RIGHT_REPEAT (BUTTON_RIGHT|BUTTON_REPEAT)
  37 #   define MAZEZAM_LEFT_REPEAT  (BUTTON_LEFT|BUTTON_REPEAT)
  38 #   define MAZEZAM_UP_REPEAT    (BUTTON_SCROLL_BACK|BUTTON_REPEAT)
  39 #   define MAZEZAM_DOWN_REPEAT  (BUTTON_SCROLL_FWD|BUTTON_REPEAT)
  40
  41 #else
  42 #   include "lib/pluginlib_actions.h"
  43 #   define MAZEZAM_MENU     PLA_CANCEL
  44 #   define MAZEZAM_RIGHT    PLA_RIGHT
  45 #   define MAZEZAM_LEFT     PLA_LEFT
  46 #   define MAZEZAM_UP       PLA_UP
  47 #   define MAZEZAM_DOWN     PLA_DOWN
  48 #   define MAZEZAM_RIGHT_REPEAT PLA_RIGHT_REPEAT
  49 #   define MAZEZAM_LEFT_REPEAT  PLA_LEFT_REPEAT
  50 #   define MAZEZAM_UP_REPEAT    PLA_UP_REPEAT
  51 #   define MAZEZAM_DOWN_REPEAT  PLA_DOWN_REPEAT
  52 const struct button_mapping *plugin_contexts[]
  53 = { pla_main_ctx };
  54 #endif
  55
  56 /* All the text is here */
  57 #define MAZEZAM_TEXT_GAME_OVER       "Game Over"
  58 #define MAZEZAM_TEXT_LIVES           "Level %d, Lives %d"
  59 #define MAZEZAM_TEXT_CHECKPOINT      "Checkpoint reached"
  60 #define MAZEZAM_TEXT_WELLDONE_TITLE  "You have escaped!"
  61 #define MAZEZAM_TEXT_WELLDONE_OPTION "Goodbye"
  62 #define MAZEZAM_TEXT_MAZEZAM_MENU    "MazezaM Menu"
  63 #define MAZEZAM_TEXT_RETRY_LEVEL     "Retry level"
  64 #define MAZEZAM_TEXT_AUDIO_PLAYBACK  "Playback Control"
  65 #define MAZEZAM_TEXT_QUIT            "Quit"
  66 #define MAZEZAM_TEXT_BACK            "Resume Game"
  67 #define MAZEZAM_TEXT_MAIN_MENU       "MazezaM"
  68 #define MAZEZAM_TEXT_CONTINUE        "Play from checkpoint"
  69 #define MAZEZAM_TEXT_PLAY_NEW_GAME   "Start New Game"
  70
  71 #define MAZEZAM_START_LIVES         3 /* how many lives at game start */
  72 #define MAZEZAM_FIRST_CHECKPOINT    3 /* The level at the first checkpoint */
  73 #define MAZEZAM_CHECKPOINT_INTERVAL 4 /* A checkpoint every _ levels */
  74
  75 #ifdef HAVE_LCD_COLOR
  76 #define MAZEZAM_HEADING_COLOR      LCD_RGBPACK(255,255,  0) /* Yellow    */
  77 #define MAZEZAM_BORDER_COLOR       LCD_RGBPACK(  0,  0,255) /* Blue      */
  78 #define MAZEZAM_COLOR              LCD_RGBPACK(255,255,255) /* White     */
  79 #define MAZEZAM_BG_COLOR           LCD_RGBPACK(  0,  0,  0) /* Black     */
  80 #define MAZEZAM_WALL_COLOR         LCD_RGBPACK(100,100,100) /* Dark gray */
  81 #define MAZEZAM_PLAYER_COLOR       LCD_RGBPACK(255,255,255) /* White     */
  82 #define MAZEZAM_GATE_COLOR         LCD_RGBPACK(100,100,100) /* Dark gray */
  83
  84 /* the rows are coloured sequentially */
  85 #define MAZEZAM_NUM_CHUNK_COLORS   8
  86 static const unsigned chunk_colors[MAZEZAM_NUM_CHUNK_COLORS] = {
  87     LCD_RGBPACK(255,192, 32), /* Orange      */
  88     LCD_RGBPACK(255,  0,  0), /* Red         */
  89     LCD_RGBPACK(  0,255,  0), /* Green       */
  90     LCD_RGBPACK(  0,255,255), /* Cyan        */
  91     LCD_RGBPACK(255,175,175), /* Pink        */
  92     LCD_RGBPACK(255,255,  0), /* Yellow      */
  93     LCD_RGBPACK(  0,  0,255), /* Blue        */
  94     LCD_RGBPACK(255,  0,255), /* Magenta     */
  95 };
  96
  97 #elif LCD_DEPTH > 1
  98
  99 #define MAZEZAM_HEADING_GRAY       LCD_BLACK
 100 #define MAZEZAM_BORDER_GRAY        LCD_DARKGRAY
 101 #define MAZEZAM_GRAY               LCD_BLACK
 102 #define MAZEZAM_BG_GRAY            LCD_WHITE
 103 #define MAZEZAM_WALL_GRAY          LCD_DARKGRAY
 104 #define MAZEZAM_PLAYER_GRAY        LCD_BLACK
 105 #define MAZEZAM_GATE_GRAY          LCD_BLACK
 106 #define MAZEZAM_CHUNK_EDGE_GRAY    LCD_BLACK
 107
 108 #define MAZEZAM_NUM_CHUNK_GRAYS    2
 109 static const unsigned chunk_gray[MAZEZAM_NUM_CHUNK_GRAYS] = {
 110     LCD_LIGHTGRAY,
 111     LCD_DARKGRAY,
 112 };
 113 /* darker version of the above */
 114 static const unsigned chunk_gray_shade[MAZEZAM_NUM_CHUNK_GRAYS] = {
 115     LCD_DARKGRAY,
 116     LCD_BLACK,
 117 };
 118 #endif
 119
 120 #define MAZEZAM_DELAY_CHECKPOINT   HZ
 121 #define MAZEZAM_DELAY_LIVES        HZ
 122 #define MAZEZAM_DELAY_GAME_OVER     (3 * HZ) / 2
 123
 124 /* maximum height of a level */
 125 #define MAZEZAM_MAX_LINES         11
 126 /* maximum number of chunks on a line */
 127 #define MAZEZAM_MAX_CHUNKS        5
 128
 129 /* A structure for storing level data in unparsed form */
 130 struct mazezam_level {
 131     short height;                  /* the number of lines */
 132     short width;                   /* the width */
 133     short entrance;                /* the line on which the entrance lies */
 134     short exit;                    /* the line on which the exit lies */
 135     char *line[MAZEZAM_MAX_LINES]; /* the chunk data in string form */
 136 };
 137
 138 /* The number of levels. */
 139 #define MAZEZAM_NUM_LEVELS        10
 140
 141 /* The levels. In theory, they could be stored in a file so this data
 142  * structure should not be accessed outside parse_level()
 143  *
 144  * These levels are copyright (C) 2002 Malcolm Tyrrell. They're
 145  * probably covered by the GPL as they constitute part of the source
 146  * code of this plugin, but you may distibute them seperately with
 147  * other Free Software if you want. You can download them from:
 148  * http://webpages.dcu.ie/~tyrrelma/MazezaM.
 149  */
 150 static const struct mazezam_level level_data[MAZEZAM_NUM_LEVELS] = {
 151     {2,7,0,0,{" $  $"," $  $$"}},
 152     {3,8,2,1,{"  $  $$$","  $ $ $"," $ $ $"}},
 153     {4,14,1,3,{" $$$$$ $$ $$","   $$  $$  $$","$$  $ $$ $$$",
 154                  "   $$$$$$$$  $"}},
 155     {6,7,4,2,{"   $"," $$$$"," $$$ $$"," $ $ $"," $ $$","$ $$"}},
 156     {6,13,0,0,{"   $$$$$","$ $$$$$  $$$"," $ $$$ $$$$",
 157                  "$ $  $$$$$$$"," $$$ $   $$","$ $ $ $$  $"}},
 158     {11,5,10,0,{"  $"," $ $$"," $$","$ $"," $ $"," $$$","$ $",
 159                  " $ $"," $ $","$ $$"," $"}},
 160     {7,16,0,6,{"      $$$$$$$","  $$$$ $$$$ $ $","$$ $$ $$$$$$ $ $",
 161                  "$      $ $"," $$$$$$$$$$$$$$"," $ $$    $ $$$",
 162                  "  $   $$$     $$"}},
 163     {4,15,2,0,{" $$$$  $$$$  $$"," $ $$ $$ $ $$"," $ $$ $$$$ $$",
 164                  " $ $$  $$$$  $"}},
 165     {7,9,6,2,{" $  $$$$"," $  $ $$"," $ $$$$ $","$ $$  $","  $   $$$",
 166          " $$$$$$","  $"}},
 167     {10,14,8,0,{"            $"," $$$$$$$$$$  $"," $$$       $$",
 168                  " $ $$$$$$$$ $"," $$$ $$$  $$$"," $$$   $  $$$",
 169                  " $ $$$$$$$ $$"," $ $ $    $$$"," $$$$$$$$$$$$",
 170                  ""}}
 171 };
 172
 173 /* This data structure which holds information about the rows */
 174 struct chunk_data {
 175     /* the number of chunks on a line */
 176     short l_num[MAZEZAM_MAX_LINES];
 177     /* the width of a chunk */
 178     short c_width[MAZEZAM_MAX_LINES][MAZEZAM_MAX_CHUNKS];
 179     /* the inset of a chunk */
 180     short c_inset[MAZEZAM_MAX_LINES][MAZEZAM_MAX_CHUNKS];
 181 };
 182
 183 /* Parsed level data */
 184 struct level_info {
 185   short width;
 186   short height;
 187   short entrance;
 188   short exit;
 189   struct chunk_data cd;
 190 };
 191
 192 /* The state variable used to hold the state of the plugin */
 193 static enum {
 194     STATE_QUIT,          /* The player wants to quit */
 195     STATE_USB_CONNECTED, /* A USB cable has been inserted */
 196     STATE_PARSE_ERROR,   /* There's a parse error in the levels */
 197     STATE_WELLDONE,      /* The player has finished the game */
 198
 199     STATE_IN_APPLICATION,
 200
 201     STATE_MAIN_MENU      /* The player is at the main menu */
 202       = STATE_IN_APPLICATION,
 203     STATE_GAME_OVER,      /* The player is out of lives */
 204
 205     STATE_IN_GAME,
 206
 207     STATE_COMPLETED      /* A level has been completed */
 208       = STATE_IN_GAME,
 209
 210     STATE_FAILED,        /* The player wants to retry the level */
 211     STATE_GAME_MENU,     /* The player wan't to access the in-game menu */
 212
 213     STATE_IN_LEVEL,
 214 } state;
 215
 216 /* The various constants needed for configuration files.
 217  * See apps/plugins/lib/configfile.*
 218  */
 219 #define MAZEZAM_CONFIG_FILENAME    "mazezam.data"
 220 #define MAZEZAM_CONFIG_NUM_ITEMS   1
 221 #define MAZEZAM_CONFIG_VERSION     0
 222 #define MAZEZAM_CONFIG_MINVERSION  0
 223 #define MAZEZAM_CONFIG_LEVELS_NAME "restart_level"
 224
 225 /* A structure containing the data that is written to
 226  * the configuration file
 227  */
 228 struct resume_data {
 229   int level; /* level at which to restart the game */
 230 };
 231
 232 #if LCD_DEPTH > 1
 233 /* Store the display settings so they are reintroduced during menus */
 234 static struct {
 235   fb_data* backdrop;
 236   unsigned foreground;
 237   unsigned background;
 238 } lcd_settings;
 239 #endif
 240
 241 /*****************************************************************************
 242 * Store the LCD settings
 243 ******************************************************************************/
 244 static void store_lcd_settings(void)
 245 {
 246     /* Store the old settings */
 247 #if LCD_DEPTH > 1
 248     lcd_settings.backdrop = rb->lcd_get_backdrop();
 249     lcd_settings.foreground = rb->lcd_get_foreground();
 250     lcd_settings.background = rb->lcd_get_background();
 251 #endif
 252 }
 253
 254 /*****************************************************************************
 255 * Restore the LCD settings to their defaults
 256 ******************************************************************************/
 257 static void restore_lcd_settings(void) {
 258     /* Turn on backlight timeout (revert to settings) */
 259     backlight_use_settings(); /* backlight control in lib/helper.c */
 260
 261     /* Restore the old settings */
 262 #if LCD_DEPTH > 1
 263     rb->lcd_set_foreground(lcd_settings.foreground);
 264     rb->lcd_set_background(lcd_settings.background);
 265     rb->lcd_set_backdrop(lcd_settings.backdrop);
 266 #endif
 267 }
 268
 269 /*****************************************************************************
 270 * Adjust the LCD settings to suit MazezaM levels
 271 ******************************************************************************/
 272 static void plugin_lcd_settings(void) {
 273     /* Turn off backlight timeout */
 274     backlight_force_on(); /* backlight control in lib/helper.c */
 275
 276     /* Set the new settings */
 277 #ifdef HAVE_LCD_COLOR
 278     rb->lcd_set_background(MAZEZAM_BG_COLOR);
 279     rb->lcd_set_backdrop(NULL);
 280 #elif LCD_DEPTH > 1
 281     rb->lcd_set_background(MAZEZAM_BG_GRAY);
 282     rb->lcd_set_backdrop(NULL);
 283 #endif
 284 }
 285
 286 /*****************************************************************************
 287 * Parse the level data from the level_data structure. This could be
 288 * replaced by a file read. Returns true if the level parsed correctly.
 289 ******************************************************************************/
 290 static bool parse_level(short level, struct level_info* li)
 291 {
 292     int i,j;
 293     char c,clast;
 294
 295     li->width    = level_data[level].width;
 296     li->height   = level_data[level].height;
 297     li->entrance = level_data[level].entrance;
 298     li->exit     = level_data[level].exit;
 299
 300     /* for each line in the level */
 301     for (i = 0; i<level_data[level].height; i++) {
 302         if (level_data[level].line[i] == NULL)
 303             return false;
 304         else {
 305             j = 0;
 306             li->cd.l_num[i] = 0;
 307             clast = ' '; /* the character we last considered */
 308             while ((c = level_data[level].line[i][j]) != '\0') {
 309                 if (c != ' ') {
 310                     if (clast == ' ') {
 311                         li->cd.l_num[i] += 1;
 312                         if (li->cd.l_num[i] > MAZEZAM_MAX_CHUNKS)
 313                             return false;
 314                         li->cd.c_inset[i][li->cd.l_num[i] - 1] = j;
 315                         li->cd.c_width[i][li->cd.l_num[i] - 1] = 1;
 316                     }
 317                     else
 318                         li->cd.c_width[i][li->cd.l_num[i] - 1] += 1;
 319                 }
 320                 clast = c;
 321                 j++;
 322             }
 323         }
 324     }
 325     return true;
 326 }
 327
 328 /*****************************************************************************
 329 * Draw the walls of a level
 330 ******************************************************************************/
 331 static void draw_walls(
 332         short size,
 333         short xOff,
 334         short yOff,
 335         short width,
 336         short height,
 337         short entrance,
 338         short exit)
 339 {
 340 #ifdef HAVE_LCD_COLOR
 341     rb->lcd_set_foreground(MAZEZAM_WALL_COLOR);
 342 #elif LCD_DEPTH > 1
 343     rb->lcd_set_foreground(MAZEZAM_WALL_GRAY);
 344 #endif
 345     /* draw the upper wall */
 346     rb->lcd_fillrect(0,0,xOff,yOff+(size*entrance));
 347     rb->lcd_fillrect(xOff,0,size*width,yOff);
 348     rb->lcd_fillrect(xOff+(size*width),0,LCD_WIDTH-xOff-(size*width),
 349                      yOff+(size*exit));
 350
 351     /* draw the lower wall */
 352     rb->lcd_fillrect(0,yOff+(size*entrance)+size,xOff,
 353                      LCD_HEIGHT-yOff-(size*entrance)-size);
 354     rb->lcd_fillrect(xOff,yOff+(size*height),size*width,
 355                      LCD_HEIGHT-yOff-(size*height));
 356     /* Note: the exit is made one pixel thinner than necessary as a visual
 357      * clue that chunks cannot be pushed into it
 358      */
 359     rb->lcd_fillrect(xOff+(size*width),yOff+(size*exit)+size-1,
 360                      LCD_WIDTH-xOff+(size*width),
 361                      LCD_HEIGHT-yOff-(size*exit)-size+1);
 362 }
 363
 364 /*****************************************************************************
 365 * Draw chunk row i
 366 ******************************************************************************/
 367 static void draw_row(
 368         short size,
 369         short xOff,
 370         short yOff,
 371         short width,
 372         short i, /* the row number */
 373         struct chunk_data *cd, /* the data about the chunks */
 374         short *shift /* an array of the horizontal offset of the lines */
 375 )
 376 {
 377     /* The assignment below is just a hack to make supress a warning on
 378      * non color targets */
 379     short j = width;
 380 #ifndef HAVE_LCD_COLOR
 381     /* We #def these out to supress a compiler warning */
 382     short k;
 383 #if LCD_DEPTH <= 1
 384     short l;
 385 #endif
 386 #endif
 387 #ifdef HAVE_LCD_COLOR
 388     /* adding width to i should have a fixed, but randomising effect on
 389      * the choice of the colours of the top line of chunks
 390      */
 391     rb->lcd_set_foreground(chunk_colors[(i+width) %
 392                            MAZEZAM_NUM_CHUNK_COLORS]);
 393 #endif
 394     for (j = 0; j<cd->l_num[i]; j++) {
 395 #ifdef HAVE_LCD_COLOR
 396         rb->lcd_fillrect(xOff+size*shift[i]+size*cd->c_inset[i][j],
 397                          yOff+size*i, cd->c_width[i][j]*size,size);
 398 #elif LCD_DEPTH > 1
 399         rb->lcd_set_foreground(MAZEZAM_CHUNK_EDGE_GRAY);
 400         rb->lcd_drawrect(xOff+size*shift[i]+size*cd->c_inset[i][j],
 401                          yOff+size*i, cd->c_width[i][j]*size,size);
 402
 403         /* draw shade */
 404         rb->lcd_set_foreground(chunk_gray_shade[(i+width) %
 405                                MAZEZAM_NUM_CHUNK_GRAYS]);
 406         rb->lcd_hline(xOff+size*shift[i]+size*cd->c_inset[i][j]+1,
 407                       xOff+size*shift[i]+size*cd->c_inset[i][j]+
 408                                                    cd->c_width[i][j]*size-3,
 409                       yOff+size*i+size-2);
 410         rb->lcd_vline(xOff+size*shift[i]+size*cd->c_inset[i][j]+
 411                                                    cd->c_width[i][j]*size-2,
 412                       yOff+size*i,
 413                       yOff+size*i+size-2);
 414
 415         /* draw fill */
 416         rb->lcd_set_foreground(chunk_gray[(i+width) %
 417                                MAZEZAM_NUM_CHUNK_GRAYS]);
 418         for (k = yOff+size*i+2; k <  yOff+size*i+size-2; k += 2)
 419             rb->lcd_hline(xOff+size*shift[i]+size*cd->c_inset[i][j]+2,
 420                           xOff+size*shift[i]+size*cd->c_inset[i][j]+
 421                                                 cd->c_width[i][j]*size-3,k);
 422 #else
 423         rb->lcd_drawrect(xOff+size*shift[i]+size*cd->c_inset[i][j],
 424                          yOff+size*i, cd->c_width[i][j]*size,size);
 425         for (k = xOff+size*shift[i]+size*cd->c_inset[i][j]+2;
 426              k < xOff+size*shift[i]+size*cd->c_inset[i][j]+
 427                                                      cd->c_width[i][j]*size;
 428              k += 2 + (i & 1))
 429             for (l = yOff+size*i+2; l <  yOff+size*i+size; l += 2 + (i & 1))
 430                  rb->lcd_drawpixel(k, l);
 431 #endif
 432     }
 433 }
 434
 435 /*****************************************************************************
 436 * Draw the player
 437 ******************************************************************************/
 438 static void draw_player(
 439         short size,
 440         short xOff,
 441         short yOff,
 442         short x,
 443         short y)
 444 {
 445     /* For drawing the player, taken from the sokoban plugin */
 446     short max = size - 1;
 447     short middle = max / 2;
 448     short ldelta = (middle + 1) / 2;
 449
 450     /* draw the player (mostly copied from the sokoban plugin) */
 451 #ifdef HAVE_LCD_COLOR
 452     rb->lcd_set_foreground(MAZEZAM_PLAYER_COLOR);
 453 #elif LCD_DEPTH > 1
 454     rb->lcd_set_foreground(MAZEZAM_PLAYER_GRAY);
 455 #endif
 456     rb->lcd_hline(xOff+size*x, xOff+size*x+max, yOff+size*y+middle);
 457     rb->lcd_vline(xOff+size*x+middle, yOff+size*y, yOff+size*y+max-ldelta);
 458     rb->lcd_drawline(xOff+size*x+middle, yOff+size*y+max-ldelta,
 459                      xOff+size*x+middle-ldelta, yOff+size*y+max);
 460     rb->lcd_drawline(xOff+size*x+middle, yOff+size*y+max-ldelta,
 461                      xOff+size*x+middle+ldelta, yOff+size*y+max);
 462 }
 463
 464 /*****************************************************************************
 465 * Draw the gate
 466 ******************************************************************************/
 467 static void draw_gate(
 468         short size,
 469         short xOff,
 470         short yOff,
 471         short entrance)
 472 {
 473     short third = size / 3;
 474     short twothirds = (2 * size) / 3;
 475 #ifdef HAVE_LCD_COLOR
 476     rb->lcd_set_foreground(MAZEZAM_GATE_COLOR);
 477 #elif LCD_DEPTH > 1
 478     rb->lcd_set_foreground(MAZEZAM_GATE_GRAY);
 479 #endif
 480     rb->lcd_hline(xOff-size,xOff-1,yOff+entrance*size+third);
 481     rb->lcd_hline(xOff-size,xOff-1,yOff+entrance*size+twothirds);
 482     rb->lcd_vline(xOff-size+third,yOff+entrance*size,
 483                   yOff+entrance*size+size-1);
 484     rb->lcd_vline(xOff-size+twothirds,yOff+entrance*size,
 485                   yOff+entrance*size+size-1);
 486 }
 487
 488 /*****************************************************************************
 489 * Draw the level
 490 ******************************************************************************/
 491 static void draw_level(
 492         struct level_info* li,
 493         short *shift, /* an array of the horizontal offset of the lines */
 494         short x, /* player's x and y coords */
 495         short y)
 496 {
 497     /* First we calculate the draw info */
 498     /* The number of pixels the side of a square should be */
 499     short size = (LCD_WIDTH/(li->width+2)) < (LCD_HEIGHT/li->height) ?
 500                  (LCD_WIDTH/(li->width+2)) : (LCD_HEIGHT/li->height);
 501     /* The x and y position (in pixels) of the top left corner of the
 502      * level
 503      */
 504     short xOff = (LCD_WIDTH - (size*li->width))/2;
 505     short yOff = (LCD_HEIGHT - (size*li->height))/2;
 506     short i;
 507
 508     rb->lcd_clear_display();
 509
 510     draw_walls(size,xOff,yOff,li->width, li->height, li->entrance, li->exit);
 511
 512     /* draw the chunks */
 513     for (i = 0; i<li->height; i++) {
 514         draw_row(size,xOff,yOff,li->width,i,&(li->cd),shift);
 515     }
 516
 517     draw_player(size,xOff,yOff,x,y);
 518
 519     /* if the player has moved into the level, draw the gate */
 520     if (x >= 0)
 521         draw_gate(size,xOff,yOff,li->entrance);
 522 }
 523
 524 /*****************************************************************************
 525 * Manage the congratulations screen
 526 ******************************************************************************/
 527 static void welldone_screen(void)
 528 {
 529     int start_selection = 0;
 530
 531     MENUITEM_STRINGLIST(menu,MAZEZAM_TEXT_WELLDONE_TITLE,NULL,
 532                           MAZEZAM_TEXT_WELLDONE_OPTION);
 533
 534     switch(rb->do_menu(&menu, &start_selection, NULL, true)){
 535         case MENU_ATTACHED_USB:
 536             state = STATE_USB_CONNECTED;
 537             break;
 538     }
 539 }
 540
 541 /*****************************************************************************
 542 * Manage the playing of a level
 543 ******************************************************************************/
 544 static void level_loop(struct level_info* li, short* shift, short *x, short *y)
 545 {
 546     int i;
 547     int button;
 548     bool blocked; /* is there a chunk in the way of the player? */
 549
 550     while (state >= STATE_IN_LEVEL) {
 551         draw_level(li, shift, *x, *y);
 552         rb->lcd_update();
 553 #ifdef __PLUGINLIB_ACTIONS_H__
 554         button = pluginlib_getaction(TIMEOUT_BLOCK, plugin_contexts,
 555                 ARRAYLEN(plugin_contexts));
 556 #else
 557         button = rb->button_get(true);
 558 #endif
 559         blocked = false;
 560
 561         switch (button) {
 562             case MAZEZAM_UP:
 563             case MAZEZAM_UP_REPEAT:
 564                 if ((*y > 0) && (*x >= 0) && (*x < li->width)) {
 565                     for (i = 0; i < li->cd.l_num[*y-1]; i++)
 566                         blocked = blocked ||
 567                                   ((*x>=shift[*y-1]+li->cd.c_inset[*y-1][i]) &&
 568                                    (*x<shift[*y-1]+li->cd.c_inset[*y-1][i]+
 569                                                    li->cd.c_width[*y-1][i]));
 570                     if (!blocked) *y -= 1;
 571                 }
 572                 break;
 573
 574             case MAZEZAM_DOWN:
 575             case MAZEZAM_DOWN_REPEAT:
 576                 if ((*y < li->height-1) && (*x >= 0) && (*x < li->width)) {
 577                     for (i = 0; i < li->cd.l_num[*y+1]; i++)
 578                         blocked = blocked ||
 579                                   ((*x>=shift[*y+1]+li->cd.c_inset[*y+1][i]) &&
 580                                    (*x<shift[*y+1]+li->cd.c_inset[*y+1][i]+
 581                                                    li->cd.c_width[*y+1][i]));
 582                     if (!blocked) *y += 1;
 583                 }
 584                 break;
 585
 586             case MAZEZAM_LEFT:
 587             case MAZEZAM_LEFT_REPEAT:
 588                 if (*x > 0) {
 589                     for (i = 0; i < li->cd.l_num[*y]; i++)
 590                         blocked = blocked ||
 591                                   (*x == shift[*y]+li->cd.c_inset[*y][i]+
 592                                                    li->cd.c_width[*y][i]);
 593                     if (!blocked) *x -= 1;
 594                     else if (shift[*y] + li->cd.c_inset[*y][0] > 0) {
 595                         *x -= 1;
 596                         shift[*y] -= 1;
 597                     }
 598                 }
 599                 break;
 600
 601             case MAZEZAM_RIGHT:
 602             case MAZEZAM_RIGHT_REPEAT:
 603                 if (*x < li->width-1) {
 604                     for (i = 0; i < li->cd.l_num[*y]; i++)
 605                         blocked = blocked ||
 606                                     (*x+1 == shift[*y]+li->cd.c_inset[*y][i]);
 607                     if (!blocked) *x += 1;
 608                     else if (shift[*y]
 609                               + li->cd.c_inset[*y][li->cd.l_num[*y]-1]
 610                               + li->cd.c_width[*y][li->cd.l_num[*y]-1]
 611                                  < li->width) {
 612                         *x += 1;
 613                         shift[*y] += 1;
 614                     }
 615                 }
 616                 else if (*x == li->width) state = STATE_COMPLETED;
 617                 else if (*y == li->exit) *x += 1;
 618                 break;
 619
 620             case MAZEZAM_MENU:
 621                 state = STATE_GAME_MENU;
 622                 break;
 623
 624             default:
 625                 if (rb->default_event_handler(button) == SYS_USB_CONNECTED)
 626                     state = STATE_USB_CONNECTED;
 627                 break;
 628         }
 629     }
 630 }
 631
 632 /*****************************************************************************
 633 * Manage the in game menu
 634 ******************************************************************************/
 635 static void in_game_menu(void)
 636 {
 637     /* The initial option is retry level */
 638     int start_selection = 1;
 639
 640     MENUITEM_STRINGLIST(menu,MAZEZAM_TEXT_MAZEZAM_MENU, NULL,
 641                          MAZEZAM_TEXT_BACK,
 642                          MAZEZAM_TEXT_RETRY_LEVEL,
 643                          MAZEZAM_TEXT_AUDIO_PLAYBACK,
 644                          MAZEZAM_TEXT_QUIT);
 645
 646     /* Don't show the status bar */
 647     switch(rb->do_menu(&menu, &start_selection, NULL, false)){
 648         case 1: /* retry */
 649             state = STATE_FAILED;
 650             break;
 651
 652         case 2: /* Audio playback */
 653             playback_control(NULL);
 654             state = STATE_IN_LEVEL;
 655             break;
 656
 657         case 3: /* quit */
 658             state = STATE_QUIT;
 659             break;
 660
 661         case MENU_ATTACHED_USB:
 662             state = STATE_USB_CONNECTED;
 663             break;
 664
 665         default: /* Back */
 666             state = STATE_IN_LEVEL;
 667             break;
 668     }
 669 }
 670
 671 /*****************************************************************************
 672 * Is the level a checkpoint
 673 ******************************************************************************/
 674 static bool at_checkpoint(int level)
 675 {
 676     if (level <= MAZEZAM_FIRST_CHECKPOINT)
 677         return level == MAZEZAM_FIRST_CHECKPOINT;
 678     else {
 679         level = level - MAZEZAM_FIRST_CHECKPOINT;
 680         return level % MAZEZAM_CHECKPOINT_INTERVAL == 0;
 681     }
 682 }
 683
 684 /*****************************************************************************
 685 * Set up and play a level
 686 * new_level should be true if this is the first time we've encountered
 687 * this level
 688 ******************************************************************************/
 689 static void play_level(short level, short lives, bool new_level)
 690 {
 691     struct level_info li;
 692     short shift[MAZEZAM_MAX_LINES]; /* amount each line has been shifted */
 693     short x,y;
 694     int i;
 695
 696     state = STATE_IN_LEVEL;
 697
 698     if (!(parse_level(level,&li)))
 699         state =  STATE_PARSE_ERROR;
 700
 701     for (i = 0; i < li.height; i++)
 702         shift[i] = 0;
 703
 704     x = -1;
 705     y = li.entrance;
 706
 707     plugin_lcd_settings();
 708     rb->lcd_clear_display();
 709
 710     draw_level(&li, shift, x, y);
 711
 712     /* If we've just reached a checkpoint, then alert the player */
 713     if (new_level && at_checkpoint(level)) {
 714         rb->splash(MAZEZAM_DELAY_CHECKPOINT, MAZEZAM_TEXT_CHECKPOINT);
 715         /* Clear the splash */
 716         draw_level(&li, shift, x, y);
 717     }
 718
 719 #ifdef HAVE_REMOTE_LCD
 720     /* Splash text seems to use the remote display by
 721      * default. I suppose I better keep it tidy!
 722      */
 723     rb->lcd_remote_clear_display();
 724 #endif
 725     rb->splashf(MAZEZAM_DELAY_LIVES, MAZEZAM_TEXT_LIVES,
 726                level+1, lives);
 727
 728     /* ensure keys pressed during the splash screen are ignored */
 729     rb->button_clear_queue();
 730
 731     /* this little loop just ensures we return to the game if the player
 732      * doesn't perform an interesting action during the in game menu */
 733     while (state >= STATE_IN_LEVEL) {
 734         level_loop(&li, shift, &x, &y);
 735
 736         if (state == STATE_GAME_MENU) {
 737             restore_lcd_settings();
 738             in_game_menu();
 739             plugin_lcd_settings();
 740         }
 741     }
 742     restore_lcd_settings();
 743 }
 744
 745 /*****************************************************************************
 746 * Update the resume data based on the level reached
 747 ******************************************************************************/
 748 static void update_resume_data(struct resume_data *r, int level)
 749 {
 750     if (at_checkpoint(level))
 751         r->level = level;
 752 }
 753
 754 /*****************************************************************************
 755 * The loop which manages a full game of MazezaM.
 756 ******************************************************************************/
 757 static void game_loop(struct resume_data *r)
 758 {
 759     int level = r->level;
 760     int lives = MAZEZAM_START_LIVES;
 761     /* We want to know when a player reaches a level for the first time,
 762      * so we keep a second copy of the level. */
 763     int old_level = level;
 764
 765     state = STATE_IN_GAME;
 766
 767     while (state >= STATE_IN_GAME)
 768     {
 769         play_level(level, lives, old_level < level);
 770         old_level = level;
 771
 772         switch (state) {
 773             case STATE_COMPLETED:
 774                 level += 1;
 775                 if (level == MAZEZAM_NUM_LEVELS)
 776                     state = STATE_WELLDONE;
 777                 break;
 778
 779             case STATE_FAILED:
 780                 lives -= 1;
 781                 if (lives == 0)
 782                     state = STATE_GAME_OVER;
 783                 break;
 784
 785             default:
 786                 break;
 787         }
 788
 789         update_resume_data(r,level);
 790     }
 791
 792     switch (state) {
 793         case STATE_GAME_OVER:
 794 #ifdef HAVE_REMOTE_LCD
 795             /* Splash text seems to use the remote display by
 796              * default. I suppose I better keep it tidy!
 797              */
 798             rb->lcd_remote_clear_display();
 799 #endif
 800             rb->splash(MAZEZAM_DELAY_GAME_OVER, MAZEZAM_TEXT_GAME_OVER);
 801             break;
 802
 803         case STATE_WELLDONE:
 804             r->level = 0;
 805             welldone_screen();
 806             break;
 807
 808         default:
 809             break;
 810     }
 811 }
 812
 813 /*****************************************************************************
 814 * Load the resume data from the config file. The data is
 815 * stored in both r and old.
 816 ******************************************************************************/
 817 static void resume_load_data (struct resume_data *r, struct resume_data *old)
 818 {
 819     struct configdata config[] = {
 820         {TYPE_INT,0,MAZEZAM_NUM_LEVELS-1, { .int_p = &(r->level) },
 821          MAZEZAM_CONFIG_LEVELS_NAME,NULL}
 822     };
 823
 824     if (configfile_load(MAZEZAM_CONFIG_FILENAME,config,
 825                          MAZEZAM_CONFIG_NUM_ITEMS, MAZEZAM_CONFIG_VERSION) < 0)
 826         r->level = 0;
 827     /* an extra precaution */
 828     else if ((r->level < 0) || (MAZEZAM_NUM_LEVELS <= r->level))
 829         r->level = 0;
 830
 831     old->level = r->level;
 832 }
 833
 834 /*****************************************************************************
 835 * Save the resume data in the config file, but only if necessary
 836 ******************************************************************************/
 837 static void resume_save_data (struct resume_data *r, struct resume_data *old)
 838 {
 839     struct configdata config[] = {
 840         {TYPE_INT,0,MAZEZAM_NUM_LEVELS-1, {.int_p = &(r->level) },
 841          MAZEZAM_CONFIG_LEVELS_NAME,NULL}
 842     };
 843
 844     /* To reduce disk usage, only write the file if the resume data has
 845      * changed.
 846      */
 847     if (old->level != r->level)
 848         configfile_save(MAZEZAM_CONFIG_FILENAME,config,
 849                           MAZEZAM_CONFIG_NUM_ITEMS, MAZEZAM_CONFIG_MINVERSION);
 850 }
 851
 852 /*****************************************************************************
 853 * Manages the main menu
 854 ******************************************************************************/
 855 static bool have_continue;
 856 static int main_menu_cb(int action, const struct menu_item_ex *this_item)
 857 {
 858     if(action == ACTION_REQUEST_MENUITEM
 859        && !have_continue && ((intptr_t)this_item)==0)
 860         return ACTION_EXIT_MENUITEM;
 861     return action;
 862 }
 863 static void main_menu(void)
 864 {
 865     /* The initial option is "play game" */
 866     int start_selection = 0;
 867     int choice = 0;
 868     struct resume_data r_data, old_data;
 869
 870     /* Load data */
 871     resume_load_data(&r_data, &old_data);
 872
 873     MENUITEM_STRINGLIST(menu,MAZEZAM_TEXT_MAIN_MENU,main_menu_cb,
 874                           MAZEZAM_TEXT_CONTINUE,
 875                           MAZEZAM_TEXT_PLAY_NEW_GAME,
 876                           MAZEZAM_TEXT_AUDIO_PLAYBACK,
 877                           MAZEZAM_TEXT_QUIT);
 878
 879     while (state >= STATE_IN_APPLICATION) {
 880         have_continue = (r_data.level != 0);
 881         choice = rb->do_menu(&menu, &start_selection, NULL, false);
 882
 883         switch(choice) {
 884             case 0: /* Continue */
 885                 state = STATE_IN_GAME;
 886                 game_loop(&r_data);
 887                 break;
 888
 889             case 1: /* Play new game */
 890                 r_data.level = 0;
 891                 state = STATE_IN_GAME;
 892                 game_loop(&r_data);
 893                 break;
 894
 895             case 2: /* Audio playback */
 896                 playback_control(NULL);
 897                 break;
 898
 899             case MENU_ATTACHED_USB:
 900                 state = STATE_USB_CONNECTED;
 901                 break;
 902
 903             default: /* Quit */
 904                 state = STATE_QUIT;
 905                 break;
 906         }
 907     }
 908
 909     /* I'm not sure if it's appropriate to write to disk on USB events.
 910      * Currently, I do so.
 911      */
 912     resume_save_data(&r_data, &old_data);
 913 }
 914
 915 /*****************************************************************************
 916 * Plugin entry point
 917 ******************************************************************************/
 918 enum plugin_status plugin_start(const void* parameter)
 919 {
 920     enum plugin_status plugin_state;
 921
 922     /* Usual plugin stuff */
 923     (void)parameter;
 924
 925     store_lcd_settings();
 926
 927     state = STATE_MAIN_MENU;
 928     main_menu();
 929
 930     switch (state) {
 931         case STATE_USB_CONNECTED:
 932             plugin_state = PLUGIN_USB_CONNECTED;
 933             break;
 934
 935         case STATE_PARSE_ERROR:
 936             plugin_state = PLUGIN_ERROR;
 937             break;
 938
 939         default:
 940             plugin_state = PLUGIN_OK;
 941             break;
 942     }
 943
 944     return plugin_state;
 945 }