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 * All files in this archive are subject to the GNU General Public License.
  18 * See the file COPYING in the source tree root for full license agreement.
  19 *
  20 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  21 * KIND, either express or implied.
  22 *
  23 ****************************************************************************/
  24
  25 #include "plugin.h"
  26 #include "helper.h"
  27
  28 #ifdef HAVE_LCD_BITMAP
  29
  30 #ifndef HAVE_LCD_COLOR
  31 #include "gray.h"
  32 #endif
  33 #include "fixedpoint.h"
  34
  35 PLUGIN_HEADER
  36
  37 /******************************* Globals ***********************************/
  38
  39 static struct plugin_api* rb; /* global api struct pointer */
  40 static unsigned char wave_array[256];  /* Pre calculated wave array */
  41 #ifdef HAVE_LCD_COLOR
  42 static fb_data colours[256]; /* Smooth transition of shades */
  43 static int redfactor = 1, greenfactor = 2, bluefactor = 3;
  44 static int redphase = 0, greenphase = 50, bluephase = 100;
  45            /* lower chance of gray at regular intervals */
  46 #else
  47 static unsigned char colours[256]; /* Smooth transition of shades */
  48 static unsigned char graybuffer[LCD_HEIGHT*LCD_WIDTH]; /* off screen buffer */
  49 static unsigned char *gbuf;
  50 static size_t        gbuf_size = 0;
  51 #endif
  52 static unsigned char sp1, sp2, sp3, sp4; /* Speed of plasma */
  53 static int plasma_frequency;
  54
  55 /* Key assignement, all bitmapped models */
  56 #if (CONFIG_KEYPAD == IPOD_4G_PAD) || (CONFIG_KEYPAD == IPOD_3G_PAD) || \
  57     (CONFIG_KEYPAD == IPOD_1G2G_PAD)
  58 #define PLASMA_QUIT BUTTON_MENU
  59 #define PLASMA_INCREASE_FREQUENCY BUTTON_SCROLL_FWD
  60 #define PLASMA_DECREASE_FREQUENCY BUTTON_SCROLL_BACK
  61 #elif (CONFIG_KEYPAD == GIGABEAT_PAD)
  62 #define PLASMA_QUIT BUTTON_A
  63 #define PLASMA_INCREASE_FREQUENCY BUTTON_UP
  64 #define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
  65
  66 #elif (CONFIG_KEYPAD == SANSA_E200_PAD)
  67 #define PLASMA_QUIT BUTTON_POWER
  68 #define PLASMA_INCREASE_FREQUENCY BUTTON_UP
  69 #define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
  70
  71 #elif (CONFIG_KEYPAD == IAUDIO_X5M5_PAD)
  72 #define PLASMA_QUIT BUTTON_POWER
  73 #define PLASMA_INCREASE_FREQUENCY BUTTON_UP
  74 #define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
  75 #elif (CONFIG_KEYPAD == IRIVER_H10_PAD)
  76 #define PLASMA_QUIT BUTTON_POWER
  77 #define PLASMA_INCREASE_FREQUENCY BUTTON_SCROLL_UP
  78 #define PLASMA_DECREASE_FREQUENCY BUTTON_SCROLL_DOWN
  79 #else
  80 #define PLASMA_QUIT BUTTON_OFF
  81 #define PLASMA_INCREASE_FREQUENCY BUTTON_UP
  82 #define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
  83 #if (CONFIG_KEYPAD == IRIVER_H100_PAD) || (CONFIG_KEYPAD == IRIVER_H300_PAD)
  84 #define PLASMA_RC_QUIT            BUTTON_RC_STOP
  85 #endif
  86 #endif
  87
  88 #ifdef HAVE_LCD_COLOR
  89 #if CONFIG_KEYPAD == IAUDIO_X5M5_PAD
  90 #define PLASMA_REGEN_COLORS BUTTON_PLAY
  91 #elif CONFIG_KEYPAD == IRIVER_H10_PAD
  92 #define PLASMA_REGEN_COLORS BUTTON_PLAY
  93 #elif CONFIG_KEYPAD == SANSA_E200_PAD
  94 #define PLASMA_REGEN_COLORS BUTTON_SELECT
  95 #elif CONFIG_KEYPAD == IPOD_4G_PAD
  96 #define PLASMA_REGEN_COLORS BUTTON_SELECT
  97 #elif CONFIG_KEYPAD == IRIVER_H300_PAD
  98 #define PLASMA_REGEN_COLORS BUTTON_SELECT
  99 #elif CONFIG_KEYPAD == GIGABEAT_PAD
 100 #define PLASMA_REGEN_COLORS BUTTON_SELECT
 101 #endif
 102 #endif
 103
 104 #define WAV_AMP 90
 105
 106 /*
 107  * Main wave function so we don't have to re-calc the sine
 108  * curve every time. Mess around WAV_AMP and FREQ to make slighlty
 109  * weirder looking plasmas!
 110  */
 111
 112 static void wave_table_generate(void)
 113 {
 114     int i;
 115     for (i=0;i<256;++i)
 116     {
 117         wave_array[i] = (unsigned char)((WAV_AMP
 118                       * (sin_int((i * 360 * plasma_frequency) / 256))) / 16384);
 119     }
 120 }
 121
 122 #ifdef HAVE_LCD_COLOR
 123 /* Make a smooth colour cycle. */
 124 void shades_generate(int time)
 125 {
 126     int i;
 127     unsigned red, green, blue;
 128     unsigned r = time * redfactor + redphase;
 129     unsigned g = time * greenfactor + greenphase;
 130     unsigned b = time * bluefactor + bluephase;
 131
 132     for(i=0; i < 256; ++i)
 133     {
 134         r &= 0xFF; g &= 0xFF; b &= 0xFF;
 135
 136         red = 2 * r;
 137         if (red > 255)
 138             red = 510 - red;
 139         green = 2 * g;
 140         if (green > 255)
 141             green = 510 - green;
 142         blue = 2 * b;
 143         if (blue > 255)
 144             blue= 510 - blue;
 145
 146         colours[i] = LCD_RGBPACK(red, green, blue);
 147
 148         r++; g++; b++;
 149     }
 150 }
 151 #else
 152 /* Make a smooth shade from black into white and back into black again. */
 153 static void shades_generate(void)
 154 {
 155     int i, y;
 156
 157     for(i=0; i < 256; ++i)
 158     {
 159         y = 2 * i;
 160         if (y > 255)
 161             y = 510 - y;
 162         colours[i] = y;
 163     }
 164 }
 165 #endif
 166
 167 void cleanup(void *parameter)
 168 {
 169     (void)parameter;
 170
 171 #ifndef HAVE_LCD_COLOR
 172     gray_release();
 173 #endif
 174     /* Turn on backlight timeout (revert to settings) */
 175     backlight_use_settings(); /* backlight control in lib/helper.c */
 176 }
 177
 178 /*
 179  * Main function that also contain the main plasma
 180  * algorithm.
 181  */
 182
 183 int main(void)
 184 {
 185     plasma_frequency = 1;
 186     int button, x, y;
 187     unsigned char p1,p2,p3,p4,t1,t2,t3,t4, z;
 188 #ifdef HAVE_LCD_COLOR
 189     fb_data *ptr;
 190     int time=0;
 191 #else
 192     unsigned char *ptr;
 193 #endif
 194
 195     /*Generate the neccesary pre calced stuff*/
 196     wave_table_generate();
 197
 198 #ifndef HAVE_LCD_COLOR
 199     shades_generate();  /* statically */
 200
 201     /* get the remainder of the plugin buffer */
 202     gbuf = (unsigned char *) rb->plugin_get_buffer(&gbuf_size);
 203
 204     gray_init(rb, gbuf, gbuf_size, false, LCD_WIDTH, LCD_HEIGHT, 32, 2<<8, NULL);
 205     /* switch on grayscale overlay */
 206     gray_show(true);
 207 #endif
 208     sp1 = 4;
 209     sp2 = 2;
 210     sp3 = 4;
 211     sp4 = 2;
 212     p1=p2=p3=p4=0;
 213     while (true)
 214     {
 215 #ifdef HAVE_LCD_COLOR
 216         shades_generate(time++); /* dynamically */
 217         ptr = rb->lcd_framebuffer;
 218 #else
 219         ptr = graybuffer;
 220 #endif
 221         t1=p1;
 222         t2=p2;
 223         for(y = 0; y < LCD_HEIGHT; ++y)
 224         {
 225             t3=p3;
 226             t4=p4;
 227             for(x = 0; x < LCD_WIDTH; ++x)
 228             {
 229                 z = wave_array[t1] + wave_array[t2] + wave_array[t3]
 230                   + wave_array[t4];
 231                 *ptr++ = colours[z];
 232                 t3+=1;
 233                 t4+=2;
 234             }
 235             t1+=2;
 236             t2+=1;
 237             rb->yield();
 238         }
 239         p1+=sp1;
 240         p2-=sp2;
 241         p3+=sp3;
 242         p4-=sp4;
 243 #ifdef HAVE_LCD_COLOR
 244         rb->lcd_update();
 245 #else
 246         gray_ub_gray_bitmap(graybuffer, 0, 0, LCD_WIDTH, LCD_HEIGHT);
 247 #endif
 248
 249         button = rb->button_get(false);
 250
 251         switch(button)
 252         {
 253 #ifdef PLASMA_RC_QUIT
 254             case PLASMA_RC_QUIT:
 255 #endif
 256             case(PLASMA_QUIT):
 257                 cleanup(NULL);
 258                 return PLUGIN_OK;
 259                 break;
 260
 261             case (PLASMA_INCREASE_FREQUENCY):
 262                 ++plasma_frequency;
 263                 wave_table_generate();
 264                 break;
 265
 266             case (PLASMA_DECREASE_FREQUENCY):
 267                 if(plasma_frequency>1)
 268                 {
 269                     --plasma_frequency;
 270                     wave_table_generate();
 271                 }
 272                 break;
 273 #ifdef HAVE_LCD_COLOR
 274             case (PLASMA_REGEN_COLORS):
 275                 redfactor=rb->rand()%4;
 276                 greenfactor=rb->rand()%4;
 277                 bluefactor=rb->rand()%4;
 278                 redphase=rb->rand()%256;
 279                 greenphase=rb->rand()%256;
 280                 bluephase=rb->rand()%256;
 281                 break;
 282 #endif
 283
 284             default:
 285                 if (rb->default_event_handler_ex(button, cleanup, NULL)
 286                     == SYS_USB_CONNECTED)
 287                     return PLUGIN_USB_CONNECTED;
 288                 break;
 289         }
 290     }
 291 }
 292
 293 /*************************** Plugin entry point ****************************/
 294
 295 enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
 296 {
 297     int ret;
 298
 299     rb = api; /* copy to global api pointer */
 300     (void)parameter;
 301 #if LCD_DEPTH > 1
 302     rb->lcd_set_backdrop(NULL);
 303 #endif
 304     /* Turn off backlight timeout */
 305     backlight_force_on(); /* backlight control in lib/helper.c */
 306
 307     ret = main();
 308
 309     return ret;
 310 }
 311
 312 #endif /* HAVE_LCD_BITMAP */