SharpDX: Create a D3D11.Texture2D from D3D10.Texture2D?

Question

I'm using SharpDX and trying to create a D3D11.Texture2D that points to the same data as an existing D3D10.Texture2D. I think that I need to get a DXGI.Surface and use that to create the new texture, but I always get this unhelpful error:

HRESULT: [0x80070057], Module: [Unknown], ApiCode: [Unknown/Unknown], Message: The parameter is incorrect.

Here's my current code that compiles but doesn't work:

private D3D11.Texture2D CreateD3D11Texture2D(D3D10.Texture2D d3d10Texture2D)
{
    var texDesc = new D3D11.Texture2DDescription
    {
        ArraySize = 1,
        BindFlags = D3D11.BindFlags.ShaderResource | D3D11.BindFlags.UnorderedAccess,
        CpuAccessFlags = D3D11.CpuAccessFlags.None,
        Format = DXGI.Format.B8G8R8A8_UNorm,
        Height = d3d10Texture2D.Description.Height,
        MipLevels = 1,
        OptionFlags = D3D11.ResourceOptionFlags.None,
        SampleDescription = new DXGI.SampleDescription(1, 0),
        Usage = D3D11.ResourceUsage.Default,
        Width = d3d10Texture2D.Description.Width
    };

    SharpDX.DataRectangle dataRectangle;
    using (var surface = d3d10Texture2D.QueryInterface<DXGI.Surface>())
    {
        int pitch = d3d10Texture2D.Description.Width
            * (int)DXGI.FormatHelper.SizeOfInBytes(d3d10Texture2D.Description.Format);
        dataRectangle = new SharpDX.DataRectangle(surface.NativePointer, pitch);
    }

    return new D3D11.Texture2D(this.d3d11Device, texDesc, dataRectangle);
}

Update

I came across an answer that outlines how to share surfaces between different DirectX devices. Based on that, I believe the correct way to get a D3D11.Texture2D from a D3D10.Texture2D is to get a resource interface and call OpenSharedResource().

Doing that simplifies my function quite a bit:

private D3D11.Texture2D CreateD3D11Texture2D(D3D10.Texture2D d3d10Texture2D)
{
    using (var resource = d3d10Texture2D.QueryInterface<DXGI.Resource>())
    {
        return this.d3d11Device.OpenSharedResource<D3D11.Texture2D>(resource.SharedHandle);
    }
}

It seems to work. Is that the best way to do it?

Answer 1

To share data among multiple textures, get a DXGI.Resource interface, and then call OpenSharedResource(). Here's how do it with SharpDX:

private D3D11.Texture2D CreateD3D11Texture2D(D3D10.Texture2D d3d10Texture2D)
{
    using (var resource = d3d10Texture2D.QueryInterface<DXGI.Resource>())
    {
        return this.d3d11Device.OpenSharedResource<D3D11.Texture2D>(resource.SharedHandle);
    }
}

Here's an answer to another question with more general information about sharing surfaces between different DirectX devices.