Merry Christmas!

var program;

​

function setup() {

  pixelDensity(1);

  createCanvas(windowWidth, windowHeight,WEBGL);

  rectMode(CENTER);

  noStroke();

  fill(204);

  program = new p5.Shader(this._renderer,vert,frag);

  }

​

function draw() {  

  this.shader(program);

  background(0);

  program.setUniform('resolution',[width,height]);

  program.setUniform('time',millis()/1000);

  program.setUniform('second',second());

  rect(0,0,width,height);

}