1708023 - Use IO Surfaces for WebGPU presentation on macOS

Status: NEW

(Core :: Graphics: WebGPU, enhancement, P5)

Description

[Dzmitry Malyshau [:kvark]]

See RenderMacIOSurfaceTextureHost

This should allow us to avoid CPU readback of frames.

Comment 1

[Erich Gubler [:ErichDonGubler]]

AIUI, we've de-scoped Mac support for webgpu-v1 for now. I don't know how to tweak the dependency graph right now, since I'm getting some validation errors, but I think this needs to be broken out from the webgpu-v1 milestone for now.

Comment 2

[Sotaro Ikeda [:sotaro]]

In chromium, mac iosurface related to WebGPU is handled by the followings.

• IOSurfaceImageBackingFactory
• IOSurfaceImageBacking
• Device::CreateTextureWrappingIOSurface()

Comment 3

[Sotaro Ikeda [:sotaro]]

It seems that third_party\rust\metal does not have enough api binding for mac iosurface.

Comment 4

[Sotaro Ikeda [:sotaro]]

Attachment: idea of present WebGPU without readback on macos

Current idea on macos.

wgpu/WebGPU in gecko does not handle Mac IOSurface nor MTLSharedEvent. Their handling needs to be added.

Comment 5

[Sotaro Ikeda [:sotaro]]

Attachment: idea of present WebGPU without readback on macos

Comment 6

[Sotaro Ikeda [:sotaro]]

Attachment: idea of present WebGPU without readback on macos

Comment 7

[Sotaro Ikeda [:sotaro]]

Attachment: WIP: Bug 1708023 - Use IO Surfaces for WebGPU presentation on macOS