D3D10_TEXTURE2D_DESC depthStencilDesc;  depthStencilDesc.Width     = mClientWidth;  depthStencilDesc.Height    = mClientHeight;  depthStencilDesc.MipLevels = 1;  depthStencilDesc.ArraySize = 1;  depthStencilDesc.Format    = DXGI_FORMAT_R32_TYPELESS;  depthStencilDesc.SampleDesc.Count   = 1; // multisampling must ...