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var gl;

function setup() {

  createCanvas(windowWidth, windowHeight,WEBGL);

  gl=this.canvas.getContext('webgl');

  gl.disable(gl.DEPTH_TEST);

  test=new p5.Shader(this._renderer,vert,frag);//shaders are loaded

  shader(test);//shaders are applied

}

function draw() {  

  test.setUniform("iResolution", [width,height]);//pass some values to the shader

  test.setUniform("iTime", millis()*.001);

  test.setUniform('iMouse',[mouseX,mouseY]);

  //rect(-width/2,-height/2, width, height); //draw the canvas to use our shaders

  box(width/2);

}