Sharp on a 4K TV on Apple TV

Pixel art drawn crisp at the right shape, with none of the shimmer that comes from scaling it wrong.

An NES game running full screen on Apple TV

The problem

A 256x240 picture on a 3840x2160 panel does not divide evenly. Scale it the lazy way and you get either a soft, blurry mess or a picture that shimmers every time something moves, because some pixels are two screen pixels wide and their neighbours are three.

What Playbox does

It draws each frame with a shader that keeps pixels square and hard-edged but blends only across the boundary between them. The result is crisp at any size, holds still when the screen scrolls, and keeps the 4:3 shape the games were drawn for.

What else Playbox does