//RGB tunnel variation for fibonacci 256 
//fastled fibonacci 256 leds  demo
//Yaroslaw Turbin 12-02-2020
//https://vk.com/ldirko 
//https://www.reddit.com/user/ldirko/
//https://twitter.com/ldir_ko 

//https://wokwi.com/arduino/projects/290311498750755341
 
#import<FastLED.h>

#define NUM_COLS 20
#define NUM_ROWS 20
#define NUM_LEDS 256  

CRGB leds [256+1];

static const uint16_t FibonPlanarTable[] PROGMEM ={
  256,256,256,256,256,256,256,256,36,39,38,37,256,256,256,256,256,256,256,256,256,256,256,256,256,13,34,35,40,
  256,58,59,60,61,256,256,256,256,256,256,256,256,256,256,14,33,256,41,56,57,68,67,66,65,64,63,256,256,256,256,
  256,256,256,12,15,32,42,55,256,69,256,79,80,81,82,83,62,256,256,256,256,256,11,16,31,256,43,54,70,77,78,94,
  93,92,91,90,84,85,256,256,256,255,10,17,30,44,53,71,76,256,95,256,101,102,103,104,89,88,256,256,256,254,9,18,
  29,45,52,72,75,96,256,100,120,119,118,117,105,106,87,256,256,253,8,19,28,46,256,51,73,97,99,121,124,125,126,
  256,116,256,107,86,232,252,7,20,256,27,47,256,50,74,122,123,145,144,256,127,256,115,256,108,233,251,6,256,21,
  256,26,48,49,256,98,146,147,148,143,256,128,256,114,109,231,234,250,5,256,22,23,25,24,0,195,171,170,169,149,
  142,256,129,113,110,230,235,256,249,4,3,2,1,244,243,256,194,172,256,168,150,141,130,112,256,256,229,236,256,
  248,247,246,245,242,220,219,196,193,173,167,151,140,131,111,256,256,208,228,237,238,239,240,241,256,221,218,
  197,192,174,166,152,139,132,256,256,256,256,209,227,226,256,256,256,222,256,217,198,191,175,165,153,138,133,
  256,256,256,256,207,210,211,225,224,223,215,216,199,256,190,176,164,154,137,134,256,256,256,256,256,206,205,
  212,213,214,201,200,256,189,177,163,256,155,136,256,256,256,256,256,256,256,256,204,203,202,256,187,188,178,
  162,256,156,135,256,256,256,256,256,256,256,256,256,183,184,185,186,180,179,161,256,157,256,256,256,256,256,
  256,256,256,256,256,256,256,256,182,181,159,160,256,158,256,256,256,256,256,256,256 
 }; 

void setup()
{LEDS.addLeds<WS2812,3,GRB>(leds,256);}

void loop() {
  int t = millis()>>3;
  int index=0;
  for (byte y = 0; y < NUM_ROWS; y++) {
  for (byte x = 0; x < NUM_COLS; x++) {
  int ledindex = pgm_read_word (FibonPlanarTable+index++);  
  if (ledindex!=256) leds[ledindex] = CHSV(code(x,y,t), 255, 255);
}}
FastLED.show();
}

byte code(int x, int y, int t) { //put your formula here 
  uint16_t outputcode = sqrt16((x-=sin8(x+t/3)>>4)*x+(y-=cos8(y+t>>1)>>4)*y)*20-t*2;  // moving tunnel variation        
  return outputcode;
}