No he wants to use hlsl, just without any blurring effects, which totally defeats the purpose.
I understand the situation but what you need to understand is that hlsl isn't meant to do what you want it to do. I mean technically it might be possible to use hlsl effects with zero blurring, but I doubt you'll get a 100% crisp picture. You don't want to use hlsl, that isn't going to get the job done. What you need is the "effect" command, which will load a png mask over the running game simulating scanlines or whatever you desire. There are tons of pre-built masks out there or you can build your own. Good luck!