D3D12 CreateDescriptorHeap Error

[weary jackal]

Hi, i am trying to get a D3D12 Example working, i don't understand why CreateDescriptorHeap is failing with E_INVALIDARG.

    RtvDescriptorHeap: ^D3.IDescriptorHeap

    {
        Description := D3.DESCRIPTOR_HEAP_DESC {
            NumDescriptors = NUM_RENDERTARGETS,
            Type = .RTV,
            Flags = {.NONE},
        }

        HResult = Device->CreateDescriptorHeap(&Description, D3.IDescriptorHeap_UUID, (^rawptr)(&RtvDescriptorHeap))
        check(HResult, "Failed to create descriptor heap!")
    }

[lunar parcel]

I'm not sure how you are even compiling that code. The description declaration doesn't appear to be correct.

description := &D3D12.DESCRIPTOR_HEAP_DESC{
    Type = .RTV,
    NumDescriptor = NUM_RENDERTARGETS,
    Flags = {}, // the only possible flag is .SHADER_VISIBLE
}