precision mediump float;

#endif

​

// grab texcoords from vert shader

varying vec2 vTexCoord;

​

// our texture coming from p5

uniform sampler2D tex0;

uniform float u_time;

​

​

float plot(vec2 st) {    

    return smoothstep(0.05, 1.0, abs(st.y - st.x));

}

​

void main() {

  vec2 uv = vTexCoord;

  uv.y = 1. - (sin(fract(uv.y)));

  uv.x = 1. - (sin(fract(uv.x)));

  vec3 color = vec3(1.0);

  float pct = plot(uv);

  color = sin((1.0-pct) + u_time/100.)*color+pct*vec3(0.0,1.0,0.0);

  vec4 tex = texture2D(tex0, uv);

  float gray = (tex.r + tex.g + tex.b) / 3.0;

  float res = 20.0;

  float scl = res / (10.0);

  vec3 thresh = vec3(fract(cos(color.r)), fract(cos(color.g)), fract(cos(tex.b)));

​

  // render the output

  gl_FragColor = vec4(thresh, 1.0);

}