apps/plugins/plasma.c

   1 /***************************************************************************
   2 *             __________               __   ___.
   3 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7 *                     \/            \/     \/    \/            \/
   8 * $Id$
   9 *
  10 * Plasma demo plugin
  11 *
  12 * My crack at making a 80's style retro plasma effect for the fantastic
  13 * rockbox!
  14 * Okay, I could've hard-coded the sine wave values, I just wanted the
  15 * challange of calculating them! silly: maybe, fun: yes!
  16 *
  17 * This program is free software; you can redistribute it and/or
  18 * modify it under the terms of the GNU General Public License
  19 * as published by the Free Software Foundation; either version 2
  20 * of the License, or (at your option) any later version.
  21 *
  22 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  23 * KIND, either express or implied.
  24 *
  25 ****************************************************************************/
  26
  27 #include "plugin.h"
  28 #include "lib/helper.h"
  29
  30 #ifdef HAVE_LCD_BITMAP
  31
  32 #ifndef HAVE_LCD_COLOR
  33 #include "lib/grey.h"
  34 #endif
  35 #include "lib/fixedpoint.h"
  36
  37 PLUGIN_HEADER
  38
  39 /******************************* Globals ***********************************/
  40
  41 static const struct plugin_api* rb; /* global api struct pointer */
  42 static unsigned char wave_array[256];  /* Pre calculated wave array */
  43 #ifdef HAVE_LCD_COLOR
  44 static fb_data colours[256]; /* Smooth transition of shades */
  45 static int redfactor = 1, greenfactor = 2, bluefactor = 3;
  46 static int redphase = 0, greenphase = 50, bluephase = 100;
  47            /* lower chance of gray at regular intervals */
  48 #else
  49 GREY_INFO_STRUCT
  50 static unsigned char colours[256]; /* Smooth transition of shades */
  51 static unsigned char greybuffer[LCD_HEIGHT*LCD_WIDTH]; /* off screen buffer */
  52 static unsigned char *gbuf;
  53 static size_t        gbuf_size = 0;
  54 #endif
  55 static unsigned char sp1, sp2, sp3, sp4; /* Speed of plasma */
  56 static int plasma_frequency;
  57
  58 /* Key assignement, all bitmapped models */
  59 #if (CONFIG_KEYPAD == IPOD_4G_PAD) || (CONFIG_KEYPAD == IPOD_3G_PAD) || \
  60     (CONFIG_KEYPAD == IPOD_1G2G_PAD)
  61 #define PLASMA_QUIT BUTTON_MENU
  62 #define PLASMA_INCREASE_FREQUENCY BUTTON_SCROLL_FWD
  63 #define PLASMA_DECREASE_FREQUENCY BUTTON_SCROLL_BACK
  64
  65 #elif (CONFIG_KEYPAD == GIGABEAT_PAD)
  66 #define PLASMA_QUIT BUTTON_POWER
  67 #define PLASMA_INCREASE_FREQUENCY BUTTON_UP
  68 #define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
  69
  70 #elif (CONFIG_KEYPAD == SANSA_E200_PAD) || \
  71 (CONFIG_KEYPAD == SANSA_C200_PAD)
  72 #define PLASMA_QUIT BUTTON_POWER
  73 #define PLASMA_INCREASE_FREQUENCY BUTTON_UP
  74 #define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
  75
  76 #elif (CONFIG_KEYPAD == IAUDIO_X5M5_PAD)
  77 #define PLASMA_QUIT BUTTON_POWER
  78 #define PLASMA_INCREASE_FREQUENCY BUTTON_UP
  79 #define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
  80
  81 #elif (CONFIG_KEYPAD == IRIVER_H10_PAD)
  82 #define PLASMA_QUIT BUTTON_POWER
  83 #define PLASMA_INCREASE_FREQUENCY BUTTON_SCROLL_UP
  84 #define PLASMA_DECREASE_FREQUENCY BUTTON_SCROLL_DOWN
  85
  86 #elif (CONFIG_KEYPAD == GIGABEAT_S_PAD)
  87 #define PLASMA_QUIT BUTTON_BACK
  88 #define PLASMA_INCREASE_FREQUENCY BUTTON_UP
  89 #define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
  90
  91 #elif (CONFIG_KEYPAD == MROBE100_PAD)
  92 #define PLASMA_QUIT BUTTON_POWER
  93 #define PLASMA_INCREASE_FREQUENCY BUTTON_UP
  94 #define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
  95
  96 #elif (CONFIG_KEYPAD == IAUDIO_M3_PAD)
  97 #define PLASMA_QUIT BUTTON_RC_REC
  98 #define PLASMA_INCREASE_FREQUENCY BUTTON_RC_VOL_UP
  99 #define PLASMA_DECREASE_FREQUENCY BUTTON_RC_VOL_DOWN
 100 #define PLASMA_RC_QUIT            BUTTON_REC
 101
 102 #elif (CONFIG_KEYPAD == COWOND2_PAD)
 103 #define PLASMA_QUIT BUTTON_POWER
 104
 105 #elif (CONFIG_KEYPAD == IAUDIO67_PAD)
 106 #define PLASMA_QUIT BUTTON_POWER
 107 #define PLASMA_INCREASE_FREQUENCY BUTTON_RIGHT
 108 #define PLASMA_DECREASE_FREQUENCY BUTTON_LEFT
 109 #define PLASMA_RC_QUIT            BUTTON_STOP
 110 #define PLASMA_REGEN_COLORS BUTTON_PLAY
 111
 112 #endif
 113
 114 #ifdef HAVE_TOUCHSCREEN
 115 #ifndef PLASMA_QUIT
 116 #define PLASMA_QUIT               BUTTON_TOPLEFT
 117 #endif
 118 #ifndef PLASMA_INCREASE_FREQUENCY
 119 #define PLASMA_INCREASE_FREQUENCY BUTTON_MIDRIGHT
 120 #endif
 121 #ifndef PLASMA_DECREASE_FREQUENCY
 122 #define PLASMA_DECREASE_FREQUENCY BUTTON_MIDLEFT
 123 #endif
 124 #endif /* HAVE_TOUCHSCREEN */
 125
 126 #ifndef PLASMA_QUIT
 127 #define PLASMA_QUIT               BUTTON_OFF
 128 #endif
 129 #ifndef PLASMA_INCREASE_FREQUENCY
 130 #define PLASMA_INCREASE_FREQUENCY BUTTON_UP
 131 #endif
 132 #ifndef PLASMA_DECREASE_FREQUENCY
 133 #define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
 134 #endif
 135
 136 #if (CONFIG_KEYPAD == IRIVER_H100_PAD) || (CONFIG_KEYPAD == IRIVER_H300_PAD)
 137 #define PLASMA_RC_QUIT            BUTTON_RC_STOP
 138 #endif
 139
 140 #ifdef HAVE_LCD_COLOR
 141 #if CONFIG_KEYPAD == IAUDIO_X5M5_PAD
 142 #define PLASMA_REGEN_COLORS BUTTON_PLAY
 143 #elif CONFIG_KEYPAD == IRIVER_H10_PAD
 144 #define PLASMA_REGEN_COLORS BUTTON_PLAY
 145 #elif (CONFIG_KEYPAD == SANSA_E200_PAD) || \
 146 (CONFIG_KEYPAD == SANSA_C200_PAD)
 147 #define PLASMA_REGEN_COLORS BUTTON_SELECT
 148 #elif CONFIG_KEYPAD == IPOD_4G_PAD
 149 #define PLASMA_REGEN_COLORS BUTTON_SELECT
 150 #elif CONFIG_KEYPAD == IRIVER_H300_PAD
 151 #define PLASMA_REGEN_COLORS BUTTON_SELECT
 152 #elif CONFIG_KEYPAD == GIGABEAT_PAD
 153 #define PLASMA_REGEN_COLORS BUTTON_SELECT
 154 #elif CONFIG_KEYPAD == GIGABEAT_S_PAD
 155 #define PLASMA_REGEN_COLORS BUTTON_SELECT
 156 #endif
 157 #ifdef HAVE_TOUCHSCREEN
 158 #ifndef PLASMA_REGEN_COLORS
 159 #define PLASMA_REGEN_COLORS BUTTON_CENTER
 160 #endif
 161 #endif /* HAVE_TOUCHSCREEN */
 162 #endif /* HAVE_LCD_COLOR */
 163
 164 #define WAV_AMP 90
 165
 166 /*
 167  * Main wave function so we don't have to re-calc the sine
 168  * curve every time. Mess around WAV_AMP and FREQ to make slighlty
 169  * weirder looking plasmas!
 170  */
 171
 172 static void wave_table_generate(void)
 173 {
 174     int i;
 175     for (i=0;i<256;++i)
 176     {
 177         wave_array[i] = (unsigned char)((WAV_AMP
 178                       * (sin_int((i * 360 * plasma_frequency) / 256))) / 16384);
 179     }
 180 }
 181
 182 #ifdef HAVE_LCD_COLOR
 183 /* Make a smooth colour cycle. */
 184 void shades_generate(int time)
 185 {
 186     int i;
 187     unsigned red, green, blue;
 188     unsigned r = time * redfactor + redphase;
 189     unsigned g = time * greenfactor + greenphase;
 190     unsigned b = time * bluefactor + bluephase;
 191
 192     for(i=0; i < 256; ++i)
 193     {
 194         r &= 0xFF; g &= 0xFF; b &= 0xFF;
 195
 196         red = 2 * r;
 197         if (red > 255)
 198             red = 510 - red;
 199         green = 2 * g;
 200         if (green > 255)
 201             green = 510 - green;
 202         blue = 2 * b;
 203         if (blue > 255)
 204             blue= 510 - blue;
 205
 206         colours[i] = LCD_RGBPACK(red, green, blue);
 207
 208         r++; g++; b++;
 209     }
 210 }
 211 #else
 212 /* Make a smooth shade from black into white and back into black again. */
 213 static void shades_generate(void)
 214 {
 215     int i, y;
 216
 217     for(i=0; i < 256; ++i)
 218     {
 219         y = 2 * i;
 220         if (y > 255)
 221             y = 510 - y;
 222         colours[i] = y;
 223     }
 224 }
 225 #endif
 226
 227 void cleanup(void *parameter)
 228 {
 229     (void)parameter;
 230
 231 #ifndef HAVE_LCD_COLOR
 232     grey_release();
 233 #endif
 234     /* Turn on backlight timeout (revert to settings) */
 235     backlight_use_settings(rb); /* backlight control in lib/helper.c */
 236 }
 237
 238 /*
 239  * Main function that also contain the main plasma
 240  * algorithm.
 241  */
 242
 243 int main(void)
 244 {
 245     plasma_frequency = 1;
 246     int button, x, y;
 247     unsigned char p1,p2,p3,p4,t1,t2,t3,t4, z;
 248 #ifdef HAVE_LCD_COLOR
 249     fb_data *ptr;
 250     int time=0;
 251 #else
 252     unsigned char *ptr;
 253 #endif
 254
 255     /*Generate the neccesary pre calced stuff*/
 256     wave_table_generate();
 257
 258 #ifndef HAVE_LCD_COLOR
 259     shades_generate();  /* statically */
 260
 261     /* get the remainder of the plugin buffer */
 262     gbuf = (unsigned char *) rb->plugin_get_buffer(&gbuf_size);
 263
 264     grey_init(rb, gbuf, gbuf_size, GREY_ON_COP, LCD_WIDTH, LCD_HEIGHT, NULL);
 265     /* switch on greyscale overlay */
 266     grey_show(true);
 267 #endif
 268     sp1 = 4;
 269     sp2 = 2;
 270     sp3 = 4;
 271     sp4 = 2;
 272     p1=p2=p3=p4=0;
 273     while (true)
 274     {
 275 #ifdef HAVE_LCD_COLOR
 276         shades_generate(time++); /* dynamically */
 277         ptr = rb->lcd_framebuffer;
 278 #else
 279         ptr = greybuffer;
 280 #endif
 281         t1=p1;
 282         t2=p2;
 283         for(y = 0; y < LCD_HEIGHT; ++y)
 284         {
 285             t3=p3;
 286             t4=p4;
 287             for(x = 0; x < LCD_WIDTH; ++x)
 288             {
 289                 z = wave_array[t1] + wave_array[t2] + wave_array[t3]
 290                   + wave_array[t4];
 291                 *ptr++ = colours[z];
 292                 t3+=1;
 293                 t4+=2;
 294             }
 295             t1+=2;
 296             t2+=1;
 297             rb->yield();
 298         }
 299         p1+=sp1;
 300         p2-=sp2;
 301         p3+=sp3;
 302         p4-=sp4;
 303 #ifdef HAVE_LCD_COLOR
 304         rb->lcd_update();
 305 #else
 306         grey_ub_gray_bitmap(greybuffer, 0, 0, LCD_WIDTH, LCD_HEIGHT);
 307 #endif
 308
 309         button = rb->button_get(false);
 310
 311         switch(button)
 312         {
 313 #ifdef PLASMA_RC_QUIT
 314             case PLASMA_RC_QUIT:
 315 #endif
 316             case(PLASMA_QUIT):
 317                 cleanup(NULL);
 318                 return PLUGIN_OK;
 319                 break;
 320
 321             case (PLASMA_INCREASE_FREQUENCY):
 322                 ++plasma_frequency;
 323                 wave_table_generate();
 324                 break;
 325
 326             case (PLASMA_DECREASE_FREQUENCY):
 327                 if(plasma_frequency>1)
 328                 {
 329                     --plasma_frequency;
 330                     wave_table_generate();
 331                 }
 332                 break;
 333 #ifdef HAVE_LCD_COLOR
 334             case (PLASMA_REGEN_COLORS):
 335                 redfactor=rb->rand()%4;
 336                 greenfactor=rb->rand()%4;
 337                 bluefactor=rb->rand()%4;
 338                 redphase=rb->rand()%256;
 339                 greenphase=rb->rand()%256;
 340                 bluephase=rb->rand()%256;
 341                 break;
 342 #endif
 343
 344             default:
 345                 if (rb->default_event_handler_ex(button, cleanup, NULL)
 346                     == SYS_USB_CONNECTED)
 347                     return PLUGIN_USB_CONNECTED;
 348                 break;
 349         }
 350     }
 351 }
 352
 353 /*************************** Plugin entry point ****************************/
 354
 355 enum plugin_status plugin_start(const struct plugin_api* api, const void* parameter)
 356 {
 357     int ret;
 358
 359     rb = api; /* copy to global api pointer */
 360     (void)parameter;
 361 #if LCD_DEPTH > 1
 362     rb->lcd_set_backdrop(NULL);
 363 #endif
 364     /* Turn off backlight timeout */
 365     backlight_force_on(rb); /* backlight control in lib/helper.c */
 366
 367     ret = main();
 368
 369     return ret;
 370 }
 371
 372 #endif /* HAVE_LCD_BITMAP */