apps/plugins/demystify.c

   1 /***************************************************************************
   2 *             __________               __   ___.
   3 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7 *                     \/            \/     \/    \/            \/
   8 * $Id$
   9 *
  10 * Copyright (C) 2005 Kevin Ferrare
  11 *
  12 * Mystify demo plugin
  13 *
  14 * This program is free software; you can redistribute it and/or
  15 * modify it under the terms of the GNU General Public License
  16 * as published by the Free Software Foundation; either version 2
  17 * of the License, or (at your option) any later version.
  18 *
  19 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  20 * KIND, either express or implied.
  21 *
  22 ****************************************************************************/
  23
  24 #include "plugin.h"
  25 #include "lib/pluginlib_exit.h"
  26
  27 #include "lib/pluginlib_actions.h"
  28 #include "lib/helper.h"
  29
  30
  31 #define DEFAULT_WAIT_TIME 3
  32 #define DEFAULT_NB_POLYGONS 7
  33 #define NB_POINTS 4
  34 #define MAX_STEP_RANGE 7
  35 #define MIN_STEP_RANGE 3
  36 #define MAX_POLYGONS 40
  37 #define MIN_POLYGONS 1
  38
  39 /* Key assignement */
  40 #define DEMYSTIFY_QUIT                      PLA_CANCEL
  41
  42 #ifdef HAVE_SCROLLWHEEL
  43
  44 #define DEMYSTIFY_INCREASE_SPEED            PLA_SCROLL_FWD
  45 #define DEMYSTIFY_DECREASE_SPEED            PLA_SCROLL_BACK
  46 #define DEMYSTIFY_INCREASE_SPEED_REPEAT     PLA_SCROLL_FWD_REPEAT
  47 #define DEMYSTIFY_DECREASE_SPEED_REPEAT     PLA_SCROLL_BACK_REPEAT
  48 #else
  49 #define DEMYSTIFY_INCREASE_SPEED            PLA_RIGHT
  50 #define DEMYSTIFY_DECREASE_SPEED            PLA_LEFT
  51 #define DEMYSTIFY_INCREASE_SPEED_REPEAT     PLA_RIGHT_REPEAT
  52 #define DEMYSTIFY_DECREASE_SPEED_REPEAT     PLA_LEFT_REPEAT
  53 #endif
  54
  55 #define DEMYSTIFY_ADD_POLYGON               PLA_UP
  56 #define DEMYSTIFY_REMOVE_POLYGON            PLA_DOWN
  57 #define DEMYSTIFY_ADD_POLYGON_REPEAT        PLA_UP_REPEAT
  58 #define DEMYSTIFY_REMOVE_POLYGON_REPEAT     PLA_DOWN_REPEAT
  59
  60 const struct button_mapping *plugin_contexts[]
  61 = {pla_main_ctx,
  62 #if defined(HAVE_REMOTE_LCD)
  63     pla_remote_ctx,
  64 #endif
  65 };
  66
  67 #ifdef HAVE_LCD_COLOR
  68 struct line_color
  69 {
  70     int r,g,b;
  71     int current_r,current_g,current_b;
  72 };
  73 #endif
  74
  75 /******************************* Globals ***********************************/
  76
  77 /*
  78  * Compute a new random step to make the point bounce the borders of the screen
  79  */
  80
  81 static int get_new_step(int step)
  82 {
  83     if(step>0)
  84         return -(MIN_STEP_RANGE + rb->rand() % (MAX_STEP_RANGE-MIN_STEP_RANGE));
  85     else
  86         return (MIN_STEP_RANGE + rb->rand() % (MAX_STEP_RANGE-MIN_STEP_RANGE));
  87 }
  88
  89 /*
  90  * Point Stuffs
  91  */
  92
  93 struct point
  94 {
  95     int x;
  96     int y;
  97 };
  98
  99 /*
 100  * Polygon Stuffs
 101  */
 102
 103 struct polygon
 104 {
 105     struct point points[NB_POINTS];
 106 };
 107
 108 /*
 109  * Generates a random polygon (which fits the screen size though)
 110  */
 111 static void polygon_init(struct polygon * polygon, struct screen * display)
 112 {
 113     int i;
 114     for(i=0;i<NB_POINTS;++i)
 115     {
 116         polygon->points[i].x=(rb->rand() % (display->getwidth()));
 117         polygon->points[i].y=(rb->rand() % (display->getheight()));
 118     }
 119 }
 120
 121 /*
 122  * Draw the given polygon onto the screen
 123  */
 124
 125 static void polygon_draw(struct polygon * polygon, struct screen * display)
 126 {
 127     int i;
 128     for(i=0;i<NB_POINTS-1;++i)
 129     {
 130         display->drawline(polygon->points[i].x, polygon->points[i].y,
 131                          polygon->points[i+1].x, polygon->points[i+1].y);
 132     }
 133     display->drawline(polygon->points[0].x, polygon->points[0].y,
 134                      polygon->points[NB_POINTS-1].x,
 135                      polygon->points[NB_POINTS-1].y);
 136 }
 137
 138 /*
 139  * Polygon moving data Stuffs
 140  */
 141
 142 struct polygon_move
 143 {
 144     struct point move_steps[NB_POINTS];
 145 };
 146
 147 static void polygon_move_init(struct polygon_move * polygon_move)
 148 {
 149     int i;
 150     for(i=0;i<NB_POINTS;++i)
 151     {
 152         polygon_move->move_steps[i].x=get_new_step(-1);
 153         /* -1 because we want a positive random step */
 154         polygon_move->move_steps[i].y=get_new_step(-1);
 155     }
 156 }
 157
 158 /*
 159  * Update the given polygon's position according to the given informations in
 160  * polygon_move (polygon_move may be updated)
 161  */
 162 static void polygon_update(struct polygon *polygon, struct screen * display,
 163                            struct polygon_move *polygon_move)
 164 {
 165     int i, x, y, step;
 166     for(i=0;i<NB_POINTS;++i)
 167     {
 168         x=polygon->points[i].x;
 169         step=polygon_move->move_steps[i].x;
 170         x+=step;
 171         if(x<=0)
 172         {
 173             x=1;
 174             polygon_move->move_steps[i].x=get_new_step(step);
 175         }
 176         else if(x>=display->getwidth())
 177         {
 178             x=display->getwidth()-1;
 179             polygon_move->move_steps[i].x=get_new_step(step);
 180         }
 181         polygon->points[i].x=x;
 182
 183         y=polygon->points[i].y;
 184         step=polygon_move->move_steps[i].y;
 185         y+=step;
 186         if(y<=0)
 187         {
 188             y=1;
 189             polygon_move->move_steps[i].y=get_new_step(step);
 190         }
 191         else if(y>=display->getheight())
 192         {
 193             y=display->getheight()-1;
 194             polygon_move->move_steps[i].y=get_new_step(step);
 195         }
 196         polygon->points[i].y=y;
 197     }
 198 }
 199
 200 /*
 201  * Polygon fifo Stuffs
 202  */
 203
 204 struct polygon_fifo
 205 {
 206     int fifo_tail;
 207     int fifo_head;
 208     int nb_items;
 209     struct polygon tab[MAX_POLYGONS];
 210 };
 211
 212 static void fifo_init(struct polygon_fifo * fifo)
 213 {
 214     fifo->fifo_tail=0;
 215     fifo->fifo_head=0;
 216     fifo->nb_items=0;
 217 }
 218
 219 static void fifo_push(struct polygon_fifo * fifo, struct polygon * polygon)
 220 {
 221     if(fifo->nb_items>=MAX_POLYGONS)
 222         return;
 223     ++(fifo->nb_items);
 224
 225     /*
 226      * Workaround for gcc (which uses memcpy internally) to avoid link error
 227      * fifo->tab[fifo->fifo_head]=polygon
 228      */
 229     rb->memcpy(&(fifo->tab[fifo->fifo_head]), polygon, sizeof(struct polygon));
 230     ++(fifo->fifo_head);
 231     if(fifo->fifo_head>=MAX_POLYGONS)
 232         fifo->fifo_head=0;
 233 }
 234
 235 static struct polygon * fifo_pop(struct polygon_fifo * fifo)
 236 {
 237     int index;
 238     if(fifo->nb_items==0)
 239         return(NULL);
 240     --(fifo->nb_items);
 241     index=fifo->fifo_tail;
 242     ++(fifo->fifo_tail);
 243     if(fifo->fifo_tail>=MAX_POLYGONS)
 244         fifo->fifo_tail=0;
 245     return(&(fifo->tab[index]));
 246 }
 247
 248 /*
 249  * Drawing stuffs
 250  */
 251
 252 static void polygons_draw(struct polygon_fifo * polygons, struct screen * display)
 253 {
 254     int i, j;
 255     for(i=0, j=polygons->fifo_tail;i<polygons->nb_items;++i, ++j)
 256     {
 257         if(j>=MAX_POLYGONS)
 258             j=0;
 259         polygon_draw(&(polygons->tab[j]), display);
 260     }
 261 }
 262
 263 static void cleanup(void)
 264 {
 265     backlight_use_settings();
 266 #ifdef HAVE_REMOTE_LCD
 267     remote_backlight_use_settings();
 268 #endif
 269 }
 270
 271 #ifdef HAVE_LCD_COLOR
 272 static void color_randomize(struct line_color * color)
 273 {
 274     color->r = rb->rand()%255;
 275     color->g = rb->rand()%255;
 276     color->b = rb->rand()%255;
 277 }
 278
 279 static void color_init(struct line_color * color)
 280 {
 281     color_randomize(color);
 282     color->current_r=color->r;
 283     color->current_g=color->g;
 284     color->current_b=color->b;
 285 }
 286
 287 static void color_change(struct line_color * color)
 288 {
 289     if(color->current_r<color->r)
 290         ++color->current_r;
 291     else if(color->current_r>color->r)
 292         --color->current_r;
 293     if(color->current_g<color->g)
 294         ++color->current_g;
 295     else if(color->current_g>color->g)
 296         --color->current_g;
 297     if(color->current_b<color->b)
 298         ++color->current_b;
 299     else if(color->current_b>color->b)
 300         --color->current_b;
 301
 302     if(color->current_r==color->r &&
 303        color->current_g==color->g &&
 304        color->current_b==color->b)
 305         color_randomize(color);
 306 }
 307
 308 #define COLOR_RGBPACK(color) \
 309     LCD_RGBPACK((color)->current_r, (color)->current_g, (color)->current_b)
 310
 311 static void color_apply(struct line_color * color, struct screen * display)
 312 {
 313     if (display->is_color){
 314         unsigned foreground=
 315             SCREEN_COLOR_TO_NATIVE(display,COLOR_RGBPACK(color));
 316         display->set_foreground(foreground);
 317     }
 318 }
 319 #endif
 320
 321 /*
 322  * Main function
 323  */
 324
 325 static int plugin_main(void)
 326 {
 327     int action;
 328     int sleep_time=DEFAULT_WAIT_TIME;
 329     int nb_wanted_polygons=DEFAULT_NB_POLYGONS;
 330     struct polygon_fifo polygons[NB_SCREENS];
 331     struct polygon_move move[NB_SCREENS]; /* This describes the movement of the leading
 332                                              polygon, the others just follow */
 333     struct polygon leading_polygon[NB_SCREENS];
 334     FOR_NB_SCREENS(i)
 335     {
 336 #ifdef HAVE_LCD_COLOR
 337         struct screen *display = rb->screens[i];
 338         if (display->is_color)
 339             display->set_background(LCD_BLACK);
 340 #endif
 341         fifo_init(&polygons[i]);
 342         polygon_move_init(&move[i]);
 343         polygon_init(&leading_polygon[i], rb->screens[i]);
 344     }
 345
 346 #ifdef HAVE_LCD_COLOR
 347     struct line_color color;
 348     color_init(&color);
 349 #endif
 350
 351     while (true)
 352     {
 353         FOR_NB_SCREENS(i)
 354         {
 355             struct screen * display=rb->screens[i];
 356             if(polygons[i].nb_items>nb_wanted_polygons)
 357             {   /* We have too many polygons, we must drop some of them */
 358                 fifo_pop(&polygons[i]);
 359             }
 360             if(nb_wanted_polygons==polygons[i].nb_items)
 361             {   /* We have the good number of polygons, we can safely drop
 362                 the last one to add the new one later */
 363                 fifo_pop(&polygons[i]);
 364             }
 365             fifo_push(&polygons[i], &leading_polygon[i]);
 366
 367             /*
 368             * Then we update the leading polygon for the next round acording to
 369             * current move (the move may be altered in case of sreen border
 370             * collision)
 371             */
 372             polygon_update(&leading_polygon[i], display, &move[i]);
 373
 374             /* Now the drawing part */
 375 #ifdef HAVE_LCD_COLOR
 376             color_apply(&color, display);
 377 #endif
 378             display->clear_display();
 379             polygons_draw(&polygons[i], display);
 380             display->update();
 381         }
 382 #ifdef HAVE_LCD_COLOR
 383         color_change(&color);
 384 #endif
 385         /* Speed handling*/
 386         if (sleep_time<0)/* full speed */
 387             rb->yield();
 388         else
 389             rb->sleep(sleep_time);
 390         action = pluginlib_getaction(TIMEOUT_NOBLOCK,
 391                                      plugin_contexts, ARRAYLEN(plugin_contexts));
 392         switch(action)
 393         {
 394             case DEMYSTIFY_QUIT:
 395                 return PLUGIN_OK;
 396
 397             case DEMYSTIFY_ADD_POLYGON:
 398             case DEMYSTIFY_ADD_POLYGON_REPEAT:
 399                 if(nb_wanted_polygons<MAX_POLYGONS)
 400                     ++nb_wanted_polygons;
 401                 break;
 402
 403             case DEMYSTIFY_REMOVE_POLYGON:
 404             case DEMYSTIFY_REMOVE_POLYGON_REPEAT:
 405                 if(nb_wanted_polygons>MIN_POLYGONS)
 406                     --nb_wanted_polygons;
 407                 break;
 408
 409             case DEMYSTIFY_INCREASE_SPEED:
 410             case DEMYSTIFY_INCREASE_SPEED_REPEAT:
 411                 if(sleep_time>=0)
 412                     --sleep_time;
 413                 break;
 414
 415             case DEMYSTIFY_DECREASE_SPEED:
 416             case DEMYSTIFY_DECREASE_SPEED_REPEAT:
 417                 ++sleep_time;
 418                 break;
 419
 420             default:
 421                 exit_on_usb(action);
 422                 break;
 423         }
 424     }
 425 }
 426
 427 /*************************** Plugin entry point ****************************/
 428
 429 enum plugin_status plugin_start(const void* parameter)
 430 {
 431     int ret;
 432
 433     (void)parameter;
 434     atexit(cleanup);
 435
 436 #if LCD_DEPTH > 1
 437     rb->lcd_set_backdrop(NULL);
 438 #endif
 439     backlight_ignore_timeout();
 440 #ifdef HAVE_REMOTE_LCD
 441     remote_backlight_ignore_timeout();
 442 #endif
 443     ret = plugin_main();
 444
 445     return ret;
 446 }