Camera Growth - OpenProcessing

mySketch
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let prev, next
let automaton
let cam
​
function setup() {
  createCanvas(windowWidth, windowHeight, WEBGL)
  cam = createCapture(VIDEO)
  cam.hide()
  prev = createFramebuffer({ format: FLOAT })
  next = createFramebuffer({ format: FLOAT })
  automaton = baseMaterialShader().modify({
    uniforms: {
      'sampler2D prev': () => prev,
      'sampler2D cam': () => cam,
      'vec2 size': () => [width, height],
      'float time': () => millis(),
    },
    'float rand': `(vec2 n) {
      return fract(sin(dot(n, vec2(12.9898, 4.1414))) * 43758.5453);
    }`,
    'Inputs getPixelInputs': `(Inputs inputs) {
      float avg = 0.;
      float inVal = texture(prev, inputs.texCoord).x;
      float camBrightness = smoothstep(0., 1., texture(cam, inputs.texCoord).x);
      for (int i = 0; i < 20; i++) {
        float angle = float(i)*0.56789 + rand(inputs.texCoord) + time * 0.001;
        float r = camBrightness * (25. + 10. * rand(inputs.texCoord + float(i) * 0.1234 + time*0.1));
        vec2 coord = inputs.texCoord + vec2(cos(angle), sin(angle)) * r / size;
        avg += texture(prev, coord).x / 20.;
      }
      float outVal = (inVal < 0.5
        ? avg > 0.6 // Rule for if it's dead
        : avg < 0.8 && avg > 0.3 // Rule for if it's alive
      ) ? 1. : 0.;
        
      outVal = mix(inVal, outVal, 0.1);
      inputs.color = vec4(vec3(outVal), 1.);
      return inputs;
    }`
  })
  seed()
}
​
function seed() {
  next.draw(() => {
    stroke(255)
    strokeWeight(10)
    noFill()
    beginShape()
    let coord = createVector(0,0)
    for (let i = 0; i < 300; i++) {
      curveVertex(coord.x, coord.y)
      coord = createVector(random(-0.5, 0.5)*width, random(-0.5, 0.5)*height)
    }
    endShape()
  })
}
function drawCircle() {
  next.draw(() => {
    noStroke()
    fill(255)
    circle(mouseX - width/2, mouseY - height/2, 20)
  })
}
function mousePressed() { drawCircle() }
function mouseDragged() { drawCircle() }
​
function draw() {
  [prev, next] = [next, prev];
  imageMode(CENTER)
  next.draw(() => {
    background(0)
    noStroke()
    shader(automaton)
    plane(width, height)
  })
  image(next, 0, 0)
}