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ReGBA by Nebuleon is a Game Boy Advance emulator based ultimately on gpSP 0.9 by Exophase. You can also submit patches on GitHub.
Release notes:
I’ve made ReGBA version 1.45.1 with two “rainbow fringe” subpixel scalers: kuwanger’s full-screen one and an aspect-ratio-preserving one based on it.
Source
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