The grayscale filter was added just to test how one adds filters to the Nestopia core.
The xbr filter is a port of Hawkynt´s C# implementation of Hyllian/Jaracara´s
xbr filter. I believe the C# implementation is based on the 3.3a variant of
The xbr filter works for both 888 and 565 color modes, but has not been tested
with the unusual 555 color mode. However, it should work with 555.
Due to idiocy on my part all interpolation calculations are truncated down to
15-bit. It´s not a hard thing to fix but as far as I can see it gives good
result as it is. One of Hyllian´s c++ impls use 16-bit math for interpolation so
it´s probably good enough as it is. Though performance should increase a bit,
as the current 15-bit impl is inefficient.
xbr vs hqx
- xbr does a better job at color accuracy (Hqx distorts/darken colors).
- Hqx retains sharp details better (Xbr is quicker to round).
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