Closed Kein closed 6 months ago
It's possible they require SM 6.6 now, which Pascal does not support due to lack of compute shader derivatives. If this is a hard requirement for UE5 now I suppose I'll have to implement a workaround.
It's possible they require SM 6.6 now, which Pascal does not support due to lack of compute shader derivatives.
Sorry, in what way this is related to SM 6.6 specifically? GTX 1070 supports up to 6.7 "virtual SM" (6.5 HW). It can run any UE5.x version in any native RHI (render interface) - D3D12, Vulkan, both build with latest available SM models (SM6.x).
I dont think this is a GPU issue?
The hardware itself doesn't really support compute shader derivatives. I assume they work around that in D3D12 driver, but NV does not expose compute_shader_derivatives in Vulkan, so I'll have to emulate it instead.
Oh I see, that makes sense.
To check if it's that you can try and see if any of them start by setting up environment variable VKD3D_SHADER_MODEL
with the value 6_6
They might not still start though as it is just faking it
It starts but I'm getting crash at: https://github.com/EpicGames/UnrealEngine/blob/463443057fb97f1af0d2951705324ce8818d2a55/Engine/Source/Runtime/D3D12RHI/Private/Windows/WindowsD3D12Viewport.cpp#L222
error code 80004001 but I dont see it in the list of valid D3D12/DXGI codes.
UE5 engine fails with generic RHI message
DirectX 12 is not supported on your system. Try running without the -dx12 or -d3d12 command line argument.
See: https://github.com/EpicGames/UnrealEngine/blob/072300df18a94f18077ca20a14224b5d99fee872/Engine/Source/Runtime/RHI/Private/Windows/WindowsDynamicRHI.cpp#L869Software information
Any UE5 game that ships in configuration D3D12 RHI/SM6: Talos Principle 2, Only Up, The Isle,. etc
System information
Log files
dxvk.log