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Use each layer transform to gate fixed-ratio kernels, and expose the custom filters through runtime selection and timing labels. Share active-filter resolution with compositor reporting and preserve the resolved filter in preemptively rendered textures while keeping the requested filter as the cache key. Add regression coverage for SGSR-compatible filter IDs, parsing, focus settings, and supported downscale ratios.
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I’ve been playing around with subpixel‐aware downscaling filters and, for testing purposes, I’ve tried implementing them into gamescope. There are currently four filters available:
subpixel_rgb – horizontal RGB subpixel layout (3:1 ratio)
subpixel_vbgr – vertical BGR subpixel layout (3:1 ratio)
subpixel_oled – RG/B subpixel layout (2:1 ratio)
subpixel_qdoled – G/RB subpixel layout (2:1 ratio)
As of now they only work with the fixed scaling ratios listed above, i.e. they can be used like this:
gamescope -F subpixel_rgb -w 5760 -h 3240 -W 1920 -H 1080 -- <command>
gamescope -F subpixel_oled -w 3840 -h 2160 -W 1920 -H 1080 -- <command>
The aim was the highest possible quality; performance has not yet been optimized at all.
They also still produce some artifacts, such as black halos around some sharp edges, which I haven’t managed to fix yet.