`createAccelStruct` raises `E_INVALIDARG` error

[Gistix]

dff3363 broke AS buffer creation by introducing D3D12_RESOURCE_FLAG_RAYTRACING_ACCELERATION_STRUCTURE into resource desc flags

[2676] D3D12 ERROR: ID3D12Device::CreateCommittedResource: D3D12_RESOURCE_DESC::Flags has unrecognized bits. The value is 0x104, and the unrecognized bits are 0x100. [ STATE_CREATION ERROR #719: CREATERESOURCE_UNRECOGNIZEDLAYOUT]

[apanteleev]

Interesting, when I was testing the legacy mode (non-enhanced barriers), there were no runtime errors. Maybe you're on a different version of Windows or something?

Anyway, please try the following change. In d3d12-buffer.cpp line 132, change the condition from:

if (d.isAccelStructStorage)
{
    resourceDesc.Flags |= D3D12_RESOURCE_FLAG_RAYTRACING_ACCELERATION_STRUCTURE;
}

to

if (d.isAccelStructStorage && m_EnhancedBarriersSupported)
{
    resourceDesc.Flags |= D3D12_RESOURCE_FLAG_RAYTRACING_ACCELERATION_STRUCTURE;
}

[Gistix]

Thank you for the quick reply!

I'm on Windows 10 Pro 22H2, with a RTX 4070 and no Agility SDK, so my drivers don't support enhanced barriers at all.

Yes, changing the condition allows AS buffers to be created normally, like they used to.

[apanteleev]

Great, thanks for confirming!
@chrisd-work Can you apply the change please?