Downsampling support

[PeterBadzhakov]

Is it possible to implement a sort of supersampling or downsampling algorithm in DXVK as found in AMD's VSR, Nvidia's DSR, GeDoSaTo, and SoTH?

[Joshua-Ashton]

This would be possible for D3D9 -- D3D11, not so much because texelFetch stuff can exist there.

[Joshua-Ashton]

(unless it was exposed as just more display modes there)

[PeterBadzhakov]

So, technically speaking, what would be the gist of it when using Vulkan?

[doitsujin]

gamescope already provides such functionality and can be used with DXVK.

Downsampling is a lot more complex than just creating higher-resolution render targets, since you also need to take into account that many applications will expect the window size to match, mouse input has to be remapped, etc.

[ruanformigoni]

Hi, although gamescope does downscaling, it does not provide a supersampling/downscaling algorithm issue 692. I've enabled FSR for supersampling here (although that is not the purpose) and the results where good, however a proper supersampling algorithm would be better.