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