CODEWITHSUNDEEP
c++-winrtdirectx-12
Palash
Palash

Reputation: 31

Correct way to resize swapChain in DirectX12

I am attempting to port the DirectX12/XAML UWP template over to a C++-WinRT version... where EVERYTHING is done via C++-WinRT and I can turn off CX. I'm currently stuck on how to ResizeBuffers on the swapchain. Before resizing the buffers I have to release all the buffer references. In C++/CX ComPtr there is Reset() method to release reference of the renderTarget buffers, but in C++/winrt com_ptr no such Reset() method exists and if I set renderTarget to nullptr in order to release it, it throws an exception shown in the Screenshot below. And if I don't set the renderTarget to nullptr then exception is not thrown but the swapChain is also not resized.

Later I also tried it using the wrl::ComPtr and the Reset() method it is still throwing the same error. Does anyone know the correct way of resizing the swapChain in DirectX12?

Screenshot of the code and error

Upvotes: 1

Views: 1667

Answers (1)

Chuck Walbourn
Chuck Walbourn

Reputation: 41057

You can't use a "fail-fast" error handler like ThrowIfFailed for ResizeBuffers or Present. Both return meaningful failure codes at runtime you must handle.

Specifically both can return DXGI_ERROR_DEVICE_REMOVED or DXGI_ERROR_DEVICE_RESET and you need to handle it. In fact, in the UWP environment, you will see this happen at start up so you must handle it--some 'classic' Win32 desktop apps just ignore it and crash at weird times like when Windows Update updates a driver while the game is running.

For details on handling 'lost-device' (which is really 'device removed'), see DeviceResources .h / .cpp.

See also Microsoft Docs which is written for DirectX 11, but all the equivalent stuff has to happen for DirectX 12.

Upvotes: 1

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