title: What is this strange pattern being drawn
body: <p>So I am creating a 2D app where circles are drawn onto an accumulation buffer. The buffer simply stores its contents and then the next frame it is faded and re-rendered over with new content creating a trailing effect.</p>
  
  <p>I have noticed this odd pattern when I draw everything at a low resolution and I cant quite explain it.</p>
  
  <p><a href="https://i.stack.imgur.com/Hzn9r.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Hzn9r.png" alt="enter image description here"></a></p>
  
  <p>And here is <a href="https://youtu.be/3YFNTx30Yy0" rel="nofollow noreferrer">a video</a> of it in action.</p>
  
  <p>Currently, everything is drawn without depth sorting and alpha blending does not happen except for the fading. The circle is drawn with a quad that simply has the outside of it discarded in the fragment buffer.</p>