​

// load in the shader

function preload() {

  exampleShader = loadShader('example.vert', 'example.frag');

}

​

function setup() {

  createCanvas(600, 600, WEBGL);

  // tell p5 to use the shader

  shader(exampleShader);

​

  noStroke();

}

​

function draw() {

  clear();

  exampleShader.setUniform("millis", millis()); 

  // run shader

  // rect(0, 0, width, height);

  ellipse(0, 0, width, height, 150);

}

​

​