HLSL and Pixel Accuracy

[laggerific]

I am warming to the idea of using something like HLSL in my MAME games, as I do like the look when surrounded by the classic bezel.  I have a 49" 4k screen on my cabinet, and that setup looks really nice, with the bezel in full.  But one thing really bums me out about HLSL as I've seen it...and perhaps I'm missing something.  But, playing at a friends Original Robotron cabinet, I noticed that it has unique diamond-esque pixel patterns.  HLSL, at least some of the presets, only appears to do scanlines.  Does anyone have any recommendations for pixel perfect HLSL accuracy?

 

Thanks!