1860735 - How to handle force_fallback_adapter with dx12

Status: NEW

(Core :: Graphics: WebGPU, task, P2)

Description

[Sotaro Ikeda [:sotaro]]

With dx12, same adapter needs to be used as WebRender. If wgpu uses a different adapter than WebRender, textures created by webgpu::ExternalTexture do not work with wgpu.

It seems that there are 2 choices
[1] ignore force_fallback_adapter
[2] disable webgpu::ExternalTexture usage.

If [2] is chosen, hardware decoded video frame handling by wgpu also going to have a problem.

Comment 1

[Sotaro Ikeda [:sotaro]]

:jimb, :nical, how force_fallback_adapter should be handled with dx12?

Comment 2

[Nicolas Silva [:nical]]

I don't have all of the implications of this question in my head right now but I guess if we are using a fallback adapter (assuming in general that means a CPU emulated adapter), then we just don't use hardware textures when interoperating with it and always that readback/upload fallback path for data that goes it or comes out of webgpu.