Possible performance improvement, OWL resampler

[Tatsuya79]

I was playing around with the settings and noticed how the OWL resampler dramatically plays on the performance.
From default 3 to 0 (lowest) I go from 700fps to 850fps.
Max quality 6 gives me around 440fps. (I'm on a Ryzen 5600X)

I changed the code to reduce the quality there:

beetle-pce-libretro/mednafen/sound/OwlResampler.cpp

Line 651 in 3a75c7c

#define OWLRESAMP_FCALC_RATE_CLAMP 128000.0 //192000.0 //96000.0 //48000.0

and there for the 0 preset:

beetle-pce-libretro/mednafen/sound/OwlResampler.cpp

Line 631 in 3a75c7c

{ 5.658, 3.62, 0.65 },

It gives me around 1000fps average.

I tried to bypass the OWL resampler completely in pce.cpp (no sound out) and it gives me even a bit more, reaching 1100fps peak.

I'm not sure how to properly bypass all that stuff, handling the buffers and coding it properly to make it an option without nuking the original code.
If anyone is interested.

[mudl0rd]

Would be nice to see how the libretro resampler fairs.