Serum v2 scaling issue

[mkalkbrenner]

If you set scalermode to anything but none to get a Serum HD on the virtual DMD or to run a 256x64 HD hardware DMD, any 128x32 (SD) hardware DMD attached seems to get downscaled content instead of the native 128x32 frames that are available in the colorization.

That results in less sharp images, especially in movie scenes.

[PastorL69]

Can confirm. When scalermode is using any upscale value it outputs a downscaled version of that on a 128x32 ZeDMD.

I guess having it also output the original rom frames in 128x32 would be the fix for ZeDMD users, so both streams at the same time. But to be honest, this is also kind of a user error. Maybe there should be an extra option to have both data streams running, as it could definitely be useful for testing.

[mkalkbrenner]

@freezy mentioned that this isn't a bug. A mix of hardware SD DMDs with virtual HD or hardware HD DMDs is simply not supported by Dmdext.

FYI PIN2DMD users confirmed that behavior. And with the latest code version I see scrambled pixels if a HD frame exists.
If you just use SD or HD alone, everything works well.