@ajmiles I've tried creating the device with `D3D_DRIVER_TYPE_WARP` but for some reason it's failing with HRESULT 0x887a0004 (DXGI UNSUPPORTED), code is like this:

    auto features = D3D_FEATURE_LEVEL_11_0;

    HRESULT hr = D3D11CreateDevice(
        nullptr,
        D3D_DRIVER_TYPE_WARP,
        nullptr,
        debug ? D3D11_CREATE_DEVICE_DEBUG : 0,
        &features,
        1,
        D3D11_SDK_VERSION,
        &Gfx.device,
        nullptr,
        &Gfx.context
    );

Maybe there's some incompatible argument there, I don't know .

In any case I'll try to determine where exactly is the threshold, and maybe make a simpler example with a 1D buffer. Also, I just realized that a window isn't at all necessary for a repro .

@ajmiles Well, I couldn't find that in the VS2017 installer, only this:

I'm on Windows 7 though, don't know if that's why it doesn't show for me.

I think the problem is the feature level though, I just ran the DirectXTK "SimpleSampleTK", and when I select FL11.0 from the dropdown list, the WARP device isn't available, it's only available for FL10.1 or below. Perhaps the WARP device that supports FL11 isn't available for Windows 7 systems?