1843891 - Present WebGPU without readback on Windows

Status: RESOLVED FIXED

(Core :: Graphics: WebGPU, enhancement)

Description

[Sotaro Ikeda [:sotaro]]

For now, gecko does readback to present WebGPU on all platforms. It is not good.

On Windows, we expected to use DX12 by default.
Since Bug 1805209 fix, WebGPU present uses RemoteTexture.

Comment 1

[Sotaro Ikeda [:sotaro]]

From chromium's implementation, it seems possible interoperate between ID3D11Texture2D and DX12. It is implemented around D3DImageBacking.

• https://source.chromium.org/search?q=D3DImageBacking&sq=&ss=chromium

Comment 2

[Sotaro Ikeda [:sotaro]]

Attachment: Diagram around chromium's D3DImageBacking

Comment 3

[Sotaro Ikeda [:sotaro]]

On gecko, one webgpu::Texture is reused in CanvasContext::GetCurrentTexture(). It seems better to use different Texture when Texture is posted to WebRender.

On chromium, WebGPUSwapBufferProvider manages SharedImage allocation and recycling.

• https://source.chromium.org/search?q=WebGPUSwapBufferProvider&sq=&ss=chromium

Comment 4

[Sotaro Ikeda [:sotaro]]

Attachment: Diagram around chromium's WebGPUSwapBufferProvider.pdf

Comment 5

[Sotaro Ikeda [:sotaro]]

Attachment: Rough idea of WebGPU present without readback

It is just current rough idea. It should be changed with more investigations.

Comment 6

[Erich Gubler [:ErichDonGubler]]

:sotaro: What is the relation of this bug's scope to bug 1708025? I see mention of readback there, but I'm unclear if that's tangential or not.

CC :jimb, :jgilbert.

Comment 7

[Sotaro Ikeda [:sotaro]]

bug 1708025 just mentioned about RenderD3D11TextureHost. Then it could be dup of this bug.

Comment 9

[Sotaro Ikeda [:sotaro]]

Attachment: Diagram of wgpu Texture allocation with DX12

Comment 10

[Sotaro Ikeda [:sotaro]]

Attachment: Diagram of wgpu Texture allocation with DX12

Comment 11

[Sotaro Ikeda [:sotaro]]

Attachment: Idea of present WebGPU without readback with DX12

Comment 12

[Erich Gubler [:ErichDonGubler]]

This bug appears to be receiving active effort from Sotaro. :sotaro, is the intent to resolve this bug fully within the next release or so? I'm assuming so, but I wanted to double-check.

Tentatively marking as P1 to indicate this, but feel free to correct.

Comment 13

[Sotaro Ikeda [:sotaro]]

Attachment: WIP: Bug 1843891 - Present WebGPU without readback on Windows

early stage of implementation.

Comment 14

[Jim Blandy :jimb]

Yes, Sotaro is working on this, and we're expecting it to be done within 2023H2, but we don't have a specific release as an ETA.

Comment 15

[Jim Blandy :jimb]

P1 seems appropriate.

Comment 16

[Sotaro Ikeda [:sotaro]]

Attachment: Bug 1843891 - Enable to present WebGPU without readback with DX12 on Windows

Comment 17

[Sotaro Ikeda [:sotaro]]

Attachment: Diagram around presenting WebGPU without readback with DX12

Comment 18

[Sotaro Ikeda [:sotaro]]

Attachment: Diagram around presenting WebGPU without readback with DX12

Comment 19

[Sotaro Ikeda [:sotaro]]

Attachment: Diagram around presenting WebGPU without readback with DX12

Comment 20

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/122147bb13ec
Enable to present WebGPU without readback with DX12 on Windows r=webgpu-reviewers,nical

Comment 21

[Narcis Beleuzu [:NarcisB]]

https://hg.mozilla.org/mozilla-central/rev/122147bb13ec