​

const spd = 0.005;

​

let t = 0;

​

function preload() {

  // load in the shader

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

}

​

function setup() {

  createCanvas(640, 360);

  noStroke();

}

​

function draw() {

  // t = sin(frameCount/50)/2 + 0.5;

  t = mouseX/width;

  if(t < 0.5) {

    background(255, 128, 0);

  } else {

    background(0, 255, 255);

  }

  exampleShader.setUniform("t", t);

  filterShader(exampleShader);

}