1845853 - WebGPU should use the same DXGI adapter as WebRender with DX12

Status: RESOLVED FIXED

(Core :: Graphics: WebGPU, defect, P3)

Description

[Jim Blandy :jimb]

Whenever possible, GPU.requestAdapter and GPUAdapter.requestDevice should return a GPUAdapter and GPUDevice referring to the same platform DXGI adapter that WebRender is using.

This will help with bug 1814222 (avoiding CPU readback), since the pixels will already be on the right GPU.

[edit: this used to imply that WebRender and WebGPU needed to be using the same device. This doesn't seem to be necessary: they just need to be on the same adapter.]

Comment 1

[Jim Blandy :jimb]

In wgpu_core, the Global::create_adapter_from_hal and Adapter::create_device_from_hal methods can be used to create wgpu adapters and devices from their platform API analogues.

Comment 2

[Sotaro Ikeda [:sotaro]]

Chromium use same GPU that matches the dxgi adapter of compositor(ANGLE) on Windows.

• WebGPUDecoderImpl::CreatePreferredAdapter()
• Backend::DiscoverPhysicalDevices()
• https://bugs.chromium.org/p/dawn/issues/detail?id=1875

Comment 4

[Sotaro Ikeda [:sotaro]]

Attachment: Bug 1845853 - Use the same DXGI adapter as WebRender with DX12

Comment 5

[Sotaro Ikeda [:sotaro]]

If same adapter is not used, If wgpu uses a different adapter than WebRender, textures created by webgpu::ExternalTextures do not work with wgpu.

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/879345307d6d
Use the same DXGI adapter as WebRender with DX12 r=webgpu-reviewers,nical

Comment 7

[Noemi Erli[:noemi_erli]]

https://hg.mozilla.org/mozilla-central/rev/879345307d6d