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ISwapChainPanelNative2::SetSwapChainHandle method (windows.ui.xaml.media.dxinterop.h)

  • Article

Sets the DirectX swap chain for SwapChainPanel using a handle to the swap chain.

Syntax

HRESULT SetSwapChainHandle(
  [in] HANDLE swapChainHandle
);

Parameters

[in] swapChainHandle

A shared handle to a swap chain.

Return value

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

SetSwapChain(HANDLE swapChainHandle) allows a swap chain to be rendered by referencing a shared handle to the swap chain.
This enables scenarios where a swap chain is created in one process and needs to be passed to another process.

XAML supports setting a DXGI swap chain as the content of a SwapChainPanel element. Apps accomplish this by querying for the ISwapChainPanelNative interface from a SwapChainPanel instance and calling SetSwapChain(IDXGISwapChain *swapChain).

This process works for pointers to in process swap chains. However, this doesn’t work for VoIP apps, which use a two-process model to enable continuing calls on a background process when a foreground process is suspended or shut down. This two-process implementation requires the ability to pass a shared handle to a swap chain, rather than a pointer, created on the background process to the foreground process to be rendered in a XAML SwapChainPanel in the foreground app.


<!-- XAML markup --> 
<Page> 
 <SwapChainPanel x:Name=”captureStreamDisplayPanel” /> 
</Page> 


// Definitions 
ComPtr<IDXGISwapChain1> m_swapChain; 
HANDLE m_swapChainHandle; 
ComPtr<ID3D11Device> m_d3dDevice; 
ComPtr<IDXGIAdapter> dxgiAdapter; 
ComPtr<IDXGIFactory2> dxgiFactory; 
ComPtr<IDXGIFactoryMedia> dxgiFactoryMedia; 
ComPtr<IDXGIDevice> dxgiDevice; 
DXGI_SWAP_CHAIN_DESC1 swapChainDesc = {0}; 


// Get DXGI factory (assume standard boilerplate has created D3D11Device) 
m_d3dDevice.As(&dxgiDevice); 
dxgiDevice->GetAdapter(&dxgiAdapter); 
dxgiAdapter->GetParent(__uuidof(IDXGIFactory2), &dxgiFactory); 

// Create swap chain and get handle 
DCompositionCreateSurfaceHandle(GENERIC_ALL, nullptr, &m_swapChainHandle); 
dxgiFactory.As(&dxgiFactoryMedia); 
dxgiFactoryMedia->CreateSwapChainForCompositionSurfaceHandle( 
  m_d3dDevice.Get(), 
  m_swapChainHandle, 
  &swapChainDesc, 
  nullptr, 
  &m_swapChain 
); 

// Set swap chain to display in a SwapChainPanel 
ComPtr<ISwapChainPanelNative2> panelNative; 
reinterpret_cast<IUnknown*>(captureStreamDisplayPanel)->QueryInterface(IID_PPV_ARGS(&panelNative))); 
panelNative->SetSwapChainHandle(m_swapChainHandle);

Requirements

Requirement Value
Minimum supported client Windows 8.1 [desktop apps | UWP apps]
Minimum supported server Windows Server 2012 R2 [desktop apps | UWP apps]
Target Platform Windows
Header windows.ui.xaml.media.dxinterop.h
DLL Windows.UI.Xaml.dll

See also

ISwapChainPanelNative2