Pastel Soften

#ifdef GL_FRAGMENT_PRECISION_HIGH
precision highp float;
#else
precision mediump float;
#endif

uniform vec2 resolution;
uniform vec2 cameraAddent;
uniform mat2 cameraOrientation;
uniform samplerExternalOES cameraBack;
uniform sampler2D backbuffer;
uniform int pointerCount;
uniform vec2 touch;

vec3 at_cam(vec2 offset)
{
    vec2 uv = (gl_FragCoord.xy + offset) / resolution.xy;
    vec2 st = cameraAddent + uv * cameraOrientation;
    return texture2D(cameraBack, st).rgb;
}

vec3 at_back(vec2 offset)
{
    vec2 uv = (gl_FragCoord.xy + offset) / resolution.xy;
    return texture2D(backbuffer, uv).rgb;
}

int r_int(float f) {
    return int(f+0.5);
}

void main(void) {

  const int layers = 4;
  const int range = 2;

  const int lyp1 = layers+1;
  const float ly1 = float(lyp1);
  const float ly2 = ly1*ly1;
  const float ly3 = ly2*ly1;
    const int hlist_size = int(pow(3.0, ly1+1.0)/2.0);
    vec2 tuv = touch.xy / resolution.xy;