IDXGIOutput1.GetDisplayModeList1 last param

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MSDN
`
UINT num = 0;
DXGI_FORMAT format = DXGI_FORMAT_R32G32B32A32_FLOAT;
UINT flags = DXGI_ENUM_MODES_INTERLACED;

pOutput->GetDisplayModeList1( format, flags, &num, 0);

...

DXGI_MODE_DESC1 * pDescs = new DXGI_MODE_DESC1[num];
pOutput->GetDisplayModeList1( format, flags, &num, pDescs);
`
that mean last param [pDesc] have not [out] flag because it can be [nil] to get number of Desc array;