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microsoft / WindowsAppSDK-Samples

Feature samples for the Windows App SDK
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Handle device-lost for text in DrawingIslands sample. #351

Closed niklasb-ms closed 5 months ago

niklasb-ms commented 5 months ago

Description

This enables the text rendering in the DrawingIslands sample to properly recover when the D3D device is lost.

The DeviceLostHelper class listens for device-lost events on the specified DXGI device. This code is adapted from https://learn.microsoft.com/en-us/windows/uwp/composition/composition-native-interop.

The DrawingIsland class now includes an instance of DeviceLostHelper and uses it to listen for events on the device associated with the TextRenderer object. On device lost, the DrawingIsland::OnDirect3DDeviceLost method is called and does the following:

  1. Tells the TextRenderer to recreate its device
  2. Re-renders all the text items
  3. Starts watching the new device

The TextRenderer class has new code to recreate its device. It also catches and ignores the exception in the unlikely event that a DXGI_ERROR_DEVICE_REMOVED error occurs during TextRenderer::Render.

I tested this by triggering multiple device losses using dxcap -forceTDR.

jeffstall commented 5 months ago

Thanks! Right now, this introduces multi-threading in, which gets us unblocked. I'll refactor this around later to use a DispatcherQueue to post back to the UI thread.