Cannot read the dlss dlls correctly

[lomirus]

Following the README.md in this repository, I attempted to build the solari example from the Bevy repository. I placed the DLSS SDK in C:\Packages\DLSS and executed the following command in the Bevy repository, which eventually compiled successfully:

cargo build --release --example solari --features=bevy_solari,dlss

After that, I moved target\release\examples\solari.exe to D:/solari/solari.exe and copied the relevant files from the assets directory to D:/solari for packaging. When I double-clicked to run D:/solari/solari.exe in File Explorer, everything ran smoothly. However, this struck me as somewhat odd because I had set the DLSS_SDK environment variable in my config.nu (I use Nushell), so theoretically, double-clicking to run it directly in File Explorer shouldn’t have picked up the DLSS_SDK variable. Yet the runtime performance was good—the on-screen information indicated that Ray Reconstruction was enabled, and there were no visible artifacts. At the time, though, I didn’t pay much attention to this issue.

Then I copied nvngx_dlss.dll and nvngx_dlssd.dll to D:/solari/. However, strangely enough, when I tried to run solari.exe again, it now reported that Ray Reconstruction was no longer supported:

2025-08-27T16:07:28.342784Z  INFO bevy_anti_aliasing::dlss: DLSS is not supported on this system

Then I tried deleting these two DLL files from D:/solari/ and renamed C:\Packages to C:\PackagesAAA (to prevent the program from accessing the SDK and rule out the influence of the DLSS_SDK environment variable). The result was that Ray Reconstruction was no longer supported. So the current situation can be summarized as follows:

DLSS_SDK env	Real DLSS SDK Path	Copied dlls to game directory	Support DLSS
C:\Packages\DLSS	C:\Packages\DLSS	❌	✅
C:\Packages\DLSS	C:\Packages\DLSS	✅	❌
C:\Packages\DLSS	C:\PackagesAAA\DLSS	✅	❌
C:\Packages\DLSS	C:\PackagesAAA\DLSS	❌	❌

Only the first scenario worked correctly. I find this quite strange, but I don’t have a reasonable explanation for it. Of course, it’s also possible that the issue was caused by some misconfiguration or incorrect operation on my end.

System Info:

OS: Windows 11
GPU: Nvidia RTX 4070 Super

[JMS55]

Thanks for the detailed bug report!

Could you please try #11? That should fix solari.exe still using DLSS_SDK, even when you unset the environment variable at runtime.

As for copying the DLLs to the same directory, I'm not too sure why it's not finding them. I'll have to think on that further.

Also I don't think that you need both DLLs. The solari demo uses only ray reconstruction, so I believe you only need to copy nvngx_dlssd.dll, and don't need nvngx_dlss.dll.

[lomirus]

I tried #11, and it did successfully resolve the issue of reading compile-time environment variables. However, there is still a problem where the dlss files in the current directory cannot be read correctly. When I execute:

start solari.exe

in the command line, the game supports DLSS at runtime because it can read DLSS_SDK. But after copying the relevant dlss files over and launching the game directly from Explorer, it still shows that DLSS is not supported:

[JMS55]

Please try the newest commit in #11. I think that should fix it.

[lomirus]

This version still shows that DLSS is not supported.

[JMS55]

Thanks for testing. I'll keep trying some things and see if I can figure it out.

[JMS55]

Did some testing, turns out that you need both the DLSS and DLSS-RR DLLs in the directory. Having just DLSS-RR doesn't work. Not sure if that's a limitation of DLSS, dlss_wgpu, bevy's DLSS integration, or what.

[JMS55]

I believe this is a requirement of DLSS. The DLSS SDK will not initialize without the DLSS DLL.

#11 should be ready to go now.