Ok , managed to find the fix

[HKEY_CURRENT_USER\Software\Wine\Direct3D]
CheckFloatConstants="enabled"

It's mentioned right here: https://appdb.winehq.org/objectManager.php?sClass=version&iId=26114#notes

Quoting: ShmerlIt's mentioned right here: https://appdb.winehq.org/objectManager.php?sClass=version&iId=26114#notes

Yup :-P
Was middle of the night and could not sleep and decided to listen to Witcher soundtrack on youtube which made me nostalgic to play it

Yeah, the Witcher soundtrack is amazing:

https://www.youtube.com/watch?v=KrnLywkGenE

I've been experimenting a bit with TW1 again, to see how Wine is handling it now. There are still these black textures flickering indoors, which can be worked around with d3d9_35 native override (installable with winetricks).

I also tested wine-nine-standalone (relevant only if you are using Mesa): https://github.com/iXit/wine-nine-standalone

The idea is same as dxvk, you just get their dll and symlink it to d3d9.dll inside your prefix. Make sure you also have Gallium 9 packages installed. In Debian it's libd3dadapter9-mesa:i386.

It has nice performance, however the flickering is still there unfortunately (unless you rely on d3d9_35 and I'm not sure what that combination is using in the end). Or may be I'm doing something wrong?



Also, there is no explicit vsync option in the game, so with Mesa unless you are testing max framerate, you can set:

export vblank_mode=3

d9vk started rendering TW nicely!

But now I need to figure out how to limit the framerate, since there is no built in vsync option in the game. Does radv have some environment variable that forces vsync?

Oh, there is a way! This forces vsync:

MESA_VK_WSI_PRESENT_MODE=fifo

Hm, forcing vsync for 60Hz monitor causes periodic black blinking in the game. I wonder if it's d9vk or radv issue.

https://github.com/Joshua-Ashton/d9vk/issues/15

What about libstrangl?

https://github.com/milaq/libstrangle