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 "grey.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 GREY_INFO_STRUCT
  48 static unsigned char colours[256]; /* Smooth transition of shades */
  49 static unsigned char greybuffer[LCD_HEIGHT*LCD_WIDTH]; /* off screen buffer */
  50 static unsigned char *gbuf;
  51 static size_t        gbuf_size = 0;
  52 #endif
  53 static unsigned char sp1, sp2, sp3, sp4; /* Speed of plasma */
  54 static int plasma_frequency;
  55
  56 /* Key assignement, all bitmapped models */
  57 #if (CONFIG_KEYPAD == IPOD_4G_PAD) || (CONFIG_KEYPAD == IPOD_3G_PAD) || \
  58     (CONFIG_KEYPAD == IPOD_1G2G_PAD)
  59 #define PLASMA_QUIT BUTTON_MENU
  60 #define PLASMA_INCREASE_FREQUENCY BUTTON_SCROLL_FWD
  61 #define PLASMA_DECREASE_FREQUENCY BUTTON_SCROLL_BACK
  62 #elif (CONFIG_KEYPAD == GIGABEAT_PAD)
  63 #define PLASMA_QUIT BUTTON_A
  64 #define PLASMA_INCREASE_FREQUENCY BUTTON_UP
  65 #define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
  66
  67 #elif (CONFIG_KEYPAD == SANSA_E200_PAD) || \
  68 (CONFIG_KEYPAD == SANSA_C200_PAD)
  69 #define PLASMA_QUIT BUTTON_POWER
  70 #define PLASMA_INCREASE_FREQUENCY BUTTON_UP
  71 #define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
  72
  73 #elif (CONFIG_KEYPAD == IAUDIO_X5M5_PAD)
  74 #define PLASMA_QUIT BUTTON_POWER
  75 #define PLASMA_INCREASE_FREQUENCY BUTTON_UP
  76 #define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
  77 #elif (CONFIG_KEYPAD == IRIVER_H10_PAD)
  78 #define PLASMA_QUIT BUTTON_POWER
  79 #define PLASMA_INCREASE_FREQUENCY BUTTON_SCROLL_UP
  80 #define PLASMA_DECREASE_FREQUENCY BUTTON_SCROLL_DOWN
  81 #elif (CONFIG_KEYPAD == GIGABEAT_S_PAD)
  82 #define PLASMA_QUIT BUTTON_BACK
  83 #define PLASMA_INCREASE_FREQUENCY BUTTON_UP
  84 #define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
  85 #elif (CONFIG_KEYPAD == MROBE100_PAD)
  86 #define PLASMA_QUIT BUTTON_POWER
  87 #define PLASMA_INCREASE_FREQUENCY BUTTON_UP
  88 #define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
  89 #else
  90 #define PLASMA_QUIT BUTTON_OFF
  91 #define PLASMA_INCREASE_FREQUENCY BUTTON_UP
  92 #define PLASMA_DECREASE_FREQUENCY BUTTON_DOWN
  93 #if (CONFIG_KEYPAD == IRIVER_H100_PAD) || (CONFIG_KEYPAD == IRIVER_H300_PAD)
  94 #define PLASMA_RC_QUIT            BUTTON_RC_STOP
  95 #endif
  96 #endif
  97
  98 #ifdef HAVE_LCD_COLOR
  99 #if CONFIG_KEYPAD == IAUDIO_X5M5_PAD
 100 #define PLASMA_REGEN_COLORS BUTTON_PLAY
 101 #elif CONFIG_KEYPAD == IRIVER_H10_PAD
 102 #define PLASMA_REGEN_COLORS BUTTON_PLAY
 103 #elif (CONFIG_KEYPAD == SANSA_E200_PAD) || \
 104 (CONFIG_KEYPAD == SANSA_C200_PAD)
 105 #define PLASMA_REGEN_COLORS BUTTON_SELECT
 106 #elif CONFIG_KEYPAD == IPOD_4G_PAD
 107 #define PLASMA_REGEN_COLORS BUTTON_SELECT
 108 #elif CONFIG_KEYPAD == IRIVER_H300_PAD
 109 #define PLASMA_REGEN_COLORS BUTTON_SELECT
 110 #elif CONFIG_KEYPAD == GIGABEAT_PAD
 111 #define PLASMA_REGEN_COLORS BUTTON_SELECT
 112 #elif CONFIG_KEYPAD == GIGABEAT_S_PAD
 113 #define PLASMA_REGEN_COLORS BUTTON_SELECT
 114 #endif
 115 #endif
 116
 117 #define WAV_AMP 90
 118
 119 /*
 120  * Main wave function so we don't have to re-calc the sine
 121  * curve every time. Mess around WAV_AMP and FREQ to make slighlty
 122  * weirder looking plasmas!
 123  */
 124
 125 static void wave_table_generate(void)
 126 {
 127     int i;
 128     for (i=0;i<256;++i)
 129     {
 130         wave_array[i] = (unsigned char)((WAV_AMP
 131                       * (sin_int((i * 360 * plasma_frequency) / 256))) / 16384);
 132     }
 133 }
 134
 135 #ifdef HAVE_LCD_COLOR
 136 /* Make a smooth colour cycle. */
 137 void shades_generate(int time)
 138 {
 139     int i;
 140     unsigned red, green, blue;
 141     unsigned r = time * redfactor + redphase;
 142     unsigned g = time * greenfactor + greenphase;
 143     unsigned b = time * bluefactor + bluephase;
 144
 145     for(i=0; i < 256; ++i)
 146     {
 147         r &= 0xFF; g &= 0xFF; b &= 0xFF;
 148
 149         red = 2 * r;
 150         if (red > 255)
 151             red = 510 - red;
 152         green = 2 * g;
 153         if (green > 255)
 154             green = 510 - green;
 155         blue = 2 * b;
 156         if (blue > 255)
 157             blue= 510 - blue;
 158
 159         colours[i] = LCD_RGBPACK(red, green, blue);
 160
 161         r++; g++; b++;
 162     }
 163 }
 164 #else
 165 /* Make a smooth shade from black into white and back into black again. */
 166 static void shades_generate(void)
 167 {
 168     int i, y;
 169
 170     for(i=0; i < 256; ++i)
 171     {
 172         y = 2 * i;
 173         if (y > 255)
 174             y = 510 - y;
 175         colours[i] = y;
 176     }
 177 }
 178 #endif
 179
 180 void cleanup(void *parameter)
 181 {
 182     (void)parameter;
 183
 184 #ifndef HAVE_LCD_COLOR
 185     grey_release();
 186 #endif
 187     /* Turn on backlight timeout (revert to settings) */
 188     backlight_use_settings(rb); /* backlight control in lib/helper.c */
 189 }
 190
 191 /*
 192  * Main function that also contain the main plasma
 193  * algorithm.
 194  */
 195
 196 int main(void)
 197 {
 198     plasma_frequency = 1;
 199     int button, x, y;
 200     unsigned char p1,p2,p3,p4,t1,t2,t3,t4, z;
 201 #ifdef HAVE_LCD_COLOR
 202     fb_data *ptr;
 203     int time=0;
 204 #else
 205     unsigned char *ptr;
 206 #endif
 207
 208     /*Generate the neccesary pre calced stuff*/
 209     wave_table_generate();
 210
 211 #ifndef HAVE_LCD_COLOR
 212     shades_generate();  /* statically */
 213
 214     /* get the remainder of the plugin buffer */
 215     gbuf = (unsigned char *) rb->plugin_get_buffer(&gbuf_size);
 216
 217     grey_init(rb, gbuf, gbuf_size, 0, LCD_WIDTH, LCD_HEIGHT, NULL);
 218     /* switch on greyscale overlay */
 219     grey_show(true);
 220 #endif
 221     sp1 = 4;
 222     sp2 = 2;
 223     sp3 = 4;
 224     sp4 = 2;
 225     p1=p2=p3=p4=0;
 226     while (true)
 227     {
 228 #ifdef HAVE_LCD_COLOR
 229         shades_generate(time++); /* dynamically */
 230         ptr = rb->lcd_framebuffer;
 231 #else
 232         ptr = greybuffer;
 233 #endif
 234         t1=p1;
 235         t2=p2;
 236         for(y = 0; y < LCD_HEIGHT; ++y)
 237         {
 238             t3=p3;
 239             t4=p4;
 240             for(x = 0; x < LCD_WIDTH; ++x)
 241             {
 242                 z = wave_array[t1] + wave_array[t2] + wave_array[t3]
 243                   + wave_array[t4];
 244                 *ptr++ = colours[z];
 245                 t3+=1;
 246                 t4+=2;
 247             }
 248             t1+=2;
 249             t2+=1;
 250             rb->yield();
 251         }
 252         p1+=sp1;
 253         p2-=sp2;
 254         p3+=sp3;
 255         p4-=sp4;
 256 #ifdef HAVE_LCD_COLOR
 257         rb->lcd_update();
 258 #else
 259         grey_ub_gray_bitmap(greybuffer, 0, 0, LCD_WIDTH, LCD_HEIGHT);
 260 #endif
 261
 262         button = rb->button_get(false);
 263
 264         switch(button)
 265         {
 266 #ifdef PLASMA_RC_QUIT
 267             case PLASMA_RC_QUIT:
 268 #endif
 269             case(PLASMA_QUIT):
 270                 cleanup(NULL);
 271                 return PLUGIN_OK;
 272                 break;
 273
 274             case (PLASMA_INCREASE_FREQUENCY):
 275                 ++plasma_frequency;
 276                 wave_table_generate();
 277                 break;
 278
 279             case (PLASMA_DECREASE_FREQUENCY):
 280                 if(plasma_frequency>1)
 281                 {
 282                     --plasma_frequency;
 283                     wave_table_generate();
 284                 }
 285                 break;
 286 #ifdef HAVE_LCD_COLOR
 287             case (PLASMA_REGEN_COLORS):
 288                 redfactor=rb->rand()%4;
 289                 greenfactor=rb->rand()%4;
 290                 bluefactor=rb->rand()%4;
 291                 redphase=rb->rand()%256;
 292                 greenphase=rb->rand()%256;
 293                 bluephase=rb->rand()%256;
 294                 break;
 295 #endif
 296
 297             default:
 298                 if (rb->default_event_handler_ex(button, cleanup, NULL)
 299                     == SYS_USB_CONNECTED)
 300                     return PLUGIN_USB_CONNECTED;
 301                 break;
 302         }
 303     }
 304 }
 305
 306 /*************************** Plugin entry point ****************************/
 307
 308 enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
 309 {
 310     int ret;
 311
 312     rb = api; /* copy to global api pointer */
 313     (void)parameter;
 314 #if LCD_DEPTH > 1
 315     rb->lcd_set_backdrop(NULL);
 316 #endif
 317     /* Turn off backlight timeout */
 318     backlight_force_on(rb); /* backlight control in lib/helper.c */
 319
 320     ret = main();
 321
 322     return ret;
 323 }
 324
 325 #endif /* HAVE_LCD_BITMAP */