Snippet of screen door transparency with hand-written pattern

ScreenDoorTransparency.hlsl

// https://en.wikipedia.org/wiki/Ordered_dithering
half threshold4x4[16] = {
  1.0 / 17.0,  9.0 / 17.0,  3.0 / 17.0, 11.0 / 17.0,
 13.0 / 17.0,  5.0 / 17.0, 15.0 / 17.0,  7.0 / 17.0,
  4.0 / 17.0, 12.0 / 17.0,  2.0 / 17.0, 10.0 / 17.0,
 16.0 / 17.0,  8.0 / 17.0, 14.0 / 17.0,  6.0 / 17.0
};

half threshold8x8[64] = {
  1.0 / 65.0, 49.0 / 65.0, 13.0 / 65.0, 61.0 / 65.0,  4.0 / 65.0, 52.0 / 65.0, 16.0 / 65.0, 64.0 / 65.0,
 33.0 / 65.0, 17.0 / 65.0, 45.0 / 65.0, 29.0 / 65.0, 36.0 / 65.0, 20.0 / 65.0, 48.0 / 65.0, 32.0 / 65.0,
  9.0 / 65.0, 57.0 / 65.0,  5.0 / 65.0, 53.0 / 65.0, 12.0 / 65.0, 60.0 / 65.0,  8.0 / 65.0, 56.0 / 65.0,
 41.0 / 65.0, 25.0 / 65.0, 37.0 / 65.0, 21.0 / 65.0, 44.0 / 65.0, 28.0 / 65.0, 40.0 / 65.0, 24.0 / 65.0,
  3.0 / 65.0, 51.0 / 65.0, 15.0 / 65.0, 63.0 / 65.0,  2.0 / 65.0, 50.0 / 65.0, 14.0 / 65.0, 62.0 / 65.0,
 35.0 / 65.0, 19.0 / 65.0, 47.0 / 65.0, 31.0 / 65.0, 34.0 / 65.0, 18.0 / 65.0, 46.0 / 65.0, 30.0 / 65.0,
 11.0 / 65.0, 59.0 / 65.0,  7.0 / 65.0, 55.0 / 65.0, 10.0 / 65.0, 58.0 / 65.0,  6.0 / 65.0, 54.0 / 65.0,
 43.0 / 65.0, 27.0 / 65.0, 39.0 / 65.0, 23.0 / 65.0, 42.0 / 65.0, 26.0 / 65.0, 38.0 / 65.0, 22.0 / 65.0,
};
int x = int(PixelScreenPos.x) % int(DistanceBasedStep);
int y = int(PixelScreenPos.y) % int(DistanceBasedStep);
return  threshold8x8[y * 8 + x] + Bias;