Gold rivers

// Author Pierre MARZIN 01/2017

var gl,noctaves,c;

function setup() {

  createCanvas(windowWidth, windowHeight,WEBGL);

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

  gl.disable(gl.DEPTH_TEST);

  noctaves=1;

  initc();

  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]);

  test.setUniform("noctaves",noctaves);

  test.setUniform("c",c);

  shader(test);

  box(width/2);

}

function mouseReleased(){

  noctaves=noctaves==6?1:noctaves+1;

  if(noctaves==1)initc();

}

function initc(){

  c=[];

  for(var i=0;i<22;i++){

    if(i<19)c[i]=random(-10,10);

    else c[i]=random(-1,1);

  }

}