Android "Shader Editor" Application GLSL Camera Shader code [Pixelated Dithering in Black & White]

gistfile1.txt

#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;

void main(void) {
  vec2 uv = gl_FragCoord.xy / resolution.xy;
  vec2 st = cameraAddent + uv * cameraOrientation;
  vec3 color = texture2D(cameraBack, st).rgb;
  float br = (color.x + color.y + color.z) / 3.0;
  float white;

  if (br < 0.4) {
    white = 0.0;
  } else if (br < 0.65) {
    
  if (mod(floor(gl_FragCoord.x / 6.0), 2.0) == 0.0 && mod(floor(gl_FragCoord.y / 6.0), 2.0) == 0.0) {
    white = 0.5;
  }
  } else {
    white = 1.0;
  }

  color = vec3(
    white,
    white,
    white);
  gl_FragColor = vec4(color, 1.0);
}