mirror of https://github.com/bsnes-emu/bsnes.git
39 lines
2.1 KiB
Markdown
39 lines
2.1 KiB
Markdown
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# Scaling
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Starting with version 0.4, the Cocoa version of SameBoy supports several GPU-accelerated scaling algorithms, some of which made their premiere at SameBoy. This document describes the algorithms supported by SameBoy.
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## General-purpose Scaling Algorithms
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Common algorithms that were not made specifically for pixel art
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### Nearest Neighbor
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A simple pixelated scaling algorithm we all know and love. This is the default filter.
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### Bilinear
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An algorithm that fills "missing" pixels using a bilinear interpolation, causing a blurry image
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### Smooth Bilinear
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A variant of bilinear filtering that applies a smooth curve to the bilinear interpolation. The results look similar to the algorithm Apple uses when scaling non-Retina graphics for Retina Displays.
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## The ScaleNx Family
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The ScaleNx family is a group of algorithm that scales pixel art by the specified factor using simple pattern-based rules. The Scale3x algorithm is not yet supported in SameBoy.
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### Scale2x
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The most simple algorithm of the family. It scales the image by a 2x factor without introducing new colors.
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### Scale4x
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This algorithm applies the Scale2x algorithm twice to scale the image by a 4x factor.
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### Anti-aliased Scale2x
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A variant of Scale2x exclusive to SameBoy that blends the Scale2x output with the Nearest Neighbor output. The specific traits of Scale2x makes this blend produce nicely looking anti-aliased output.
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### Anti-aliased Scale4x
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Another exclusive algorithm that works by applying the Anti-aliased Scale2x algorithm twice
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## The OmniScale Family (beta)
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OmniScale is an exclusive algorithm developed for SameBoy. It combines pattern-based rules with a unique locally paletted bilinear filtering technique to scale an image by any factor, including non-integer factors. The algorithm is currently in beta, and its pattern-based rule do not currently detect 30- and 60-degree diagonals, making them look jaggy.
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### OmniScale
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The base version of the algorithm, which generates aliased output with very few new colors introduced.
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### Anti-aliased OmniScale
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A variant of OmniScale that produces anti-aliased output using 2x super-sampling.
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