Short answer: You don't. Longer answer: if you can find some type of game launcher client with umu to allow Proton to work with your games, you can in theory set launcher options. What such launcher exists? Fuck if I'd know.
If I'm not mistaken, only like the latest of the latest games coming out in $current_year have FSR4 available in the options menu. Tons of other games are stuck at FSR1/FSR2 anyway, and many more before those don't have FSR at all. That's why there's an unending and frankly confusing number of FSR launcher args theoretically available to you on Steam.
If I'm not mistaken, only like the latest of the latest games coming out in $current_year have FSR4 available in the options menu. Tons of other games are stuck at FSR1/FSR2 anyway, and many more before those don't have FSR at all. That's why there's an unending and frankly confusing number of FSR launcher args theoretically available to you on Steam.
Well the developer has to add it to the GPU pipeline. So older games unless updated won't have the support. I've always just seen it as part of the graphics settings.
Longer answer: Go to the FSR repo and download the latest release. Inside /Samples/Upscalers/FidelityFX_FSR/dx12/x64/Release/ there will be dlls for fsr 4. Just drag and drop the loader, upscaler, and framegen dlls to the game. Some games combine these into a single file, if thats the case just rename the loader and override the file (usually amd_fidelityfx_dx12.dll) If this doesn't work for whatever reason or the game uses fsr 2 or older, just use optiscaler, this even allows you to replace DLSS with fsr4.
Or you can go to the optiscaler discord and get the FSR 4.0.2c dll file and drop it into where FSR usually is without optiscaler
The optiscaler version of FSR 4 will work on anything so I stopped caring if AMD releases it or not because the open source fork is great and will even work on a GTX 10 series
Optiscaler can sometimes give a small to large hit on performance and stability amd some games do not like it while others love it, but for the FSR 4 dll to work it needs to be in a game that supports FSR 4 natively, RE Requiem and Cyberpunk works that way but Stellar Blade demands optiscaler for FSR 4
When Optiscaler released the unofficial FSR 4 mod, it only worked on Linux or modded drivers before FSR 4.0.2b so it actually works best on linux to minimize performance loss from how heavy the model is as well and Xess is a nice and very underrated in between of FSR 3 and 4. In some games Xess will render more foliage and has a lower performance hit than FSR 4. Cyberpunk also has the worst FSR implementation but the best Xess implementation I have seen because Xess is the only upscaler that lacks moire artifacts in the shadows and smoke
If a game, like Trepang2, lacks FSR but has DLSS or is DX11, optiscaler can spoof DLSS as FSR 3 and you can run optiscaler over it and make the spoofed DLL file into FSR 4 or Xess
