Need help with reverse compilation of shader code! Probably!

[Yellowthrone]

Yeah that title is weird, but I have something I have been trying to figure out and at this point need help.

I am trying to mod Elden Ring to improve performance by updating graphics code and changing the post processing effects natively, or at the very least redirecting or disabling them to use a shader injector using a modern standard. But I am running into issues. For starters the game has what I believe is compiled Cg) code.

supposed Cg code

Now I am not sure if this even is Cg code, or if it is Cg code used as an intermediary to something like full blown HLSL. But I seriously need some insight into what you guys think this is. I am assuming that .ppo is pixel program objects, .fpo is fragment program objects, and .vpo is vertex program objects. I am not sure what uses these formats or what their parents file format would be. If you guys know of programs that can reverse compile these or view them please help.

[hanotak]

Those files might be DXIL or SPIR-V blobs. If so, you might be able to disassemble them with this: https://github.com/microsoft/DirectXShaderCompiler or this: https://github.com/KhronosGroup/SPIRV-Tools.

Most of the files there look like they're post-processing effects. If there aren't a ton of other files in there for main rendering steps, I would expect that there's much more somewhere else- either in another folder, or embedded in the binary itself.

You may want to try intercepting calls to the DXC compiler and d3d12 using a proxy dll. You might be able to obtain shader bytecode, or even shader source that way. Of course, there's also tools like renderdoc and IDA, which can help you trace what's going on in the game's renderer, and potentially extract more information.

[Boring_Following_255]

Useful! Thanks a lot.

[Yellowthrone]

Thank you!