Pixel perfect blocky upscaling: how to achieve?

[Anonymous]

I used to run my arcade cab with PiMame, and now I’m trying RetroPie. Much friendlier UI and easier to operate.
There are a few things I can’t find, the most important being upscaling settings.

I want blocky upscaling without any anti-aliasing. It was like the default on the PiMame, but can’t find it here.

I run RetroPi 3.5, RPi 2B, 1920×1200 Hdmi-DVI connected monitor.
I also want to sync to the monitors 59.95Hz to prevent tearing on horizontal/vertical scrolling shooters/platform games.

Strange thin: if I use the tweaks used at PiMame in the mame-config file, Mame stops working altogether. Guess it has to be set up somewhere in RetroArch.
See images for desired looks.

[gizmo98]

Disable bilinear filter: Under system “retropie” you can find “Edit RetroPie/RetroArch configurations”. Run this option and selet “Change common RetroArch options”. Select “All”. Now disable “smooth_video” and close menu.

Disable hardware upscaling: If you launch a game press a button (or x/m). Launch menu pops up. Select option framebuffer (fb) resolution. Select framebuffer resolution = native resolution.

[Anonymous]

It is close but not perfect. It remains one pixel of fuzz around each block.
Another problem: aspect is wrong. Loop Master for example is 360×224 pixel, and it becomes super-wide screen, where it should render as 4:3.

[Author]

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