A mandala made from OR triangles overflow from the centre in a XOR munching square landscape

LogicalMandalaOverflow.pde

//inspired from Flopine 8bit demoscene code
//https://www.youtube.com/watch?v=_JQm46HuDEE
int f=1,t,u,v,x,y;
void setup() {
  size(1280, 720);
  colorMode(HSB);
  noStroke();
  clear();
}
void draw() {
  t+=f;
  if (t>4e3 || t<0) f*=-1;
  for (y=0; y< height;y+=5) {
    for (x=0; x< width;x+=5) {
      u = abs(x-width/2);
      v = abs(y-height/2);
      fill(((int((u^v)+t)>>2)+.5*t%(u|v))%150+69,255,255);
      //fill(((int((u^v)+t)>>2)+.5*t%(u|v))%150+69); //black&white
      //fill(((int((u^v)+t)>>2)+.5*t%((u|v)+(u&v)))%150+69,255,255);//reticular diamond overgrow
      rect(x,y,5,5);
    }
  }
}