Canvaskit doesn't build for webgpu

[Bruno Nicoletti]

Hi,

Canvaskit doesn't build with webgpu enabled, even though the Makefile and the .gn file have flags, and the .cpp and .js have code for it. I built it via a 'make release_webgpu' command in the canvaskit directory.

Digging into it, the canvaskit BUILD.gn file never actually sets the "CK_ENABLE_WEBGPU" preprocessor macro. If I do set this it fails to compile the .cpp file as there are calls to unknown functions, for example....

../../modules/canvaskit/canvaskit_bindings.cpp:352:29: error: no member named 'MakeDawn' in 'GrDirectContext'
  352 |     return GrDirectContext::MakeDawn(device, options);

Is WebGPU support for canvaskit still a work in progress?

FWIW WebGL works happily when building as 'make release'.

My checkout is 11046fd10394ec5dbe996ec4eeabc7b3a74e8f1f

thanks

Bruno

[William Candillon]

I think that because CanvasKit is using Ganesh and Ganesh doesn't support WebGPU, it is not possible to make the two work together. I think one would have to write it's own WASM Skia build. 

I would love to learn what would be a good starting point for doing so. I'm also quite interested in using Skia on the Web with WebGPU. 

Kind regards,

William

[Bruno Nicoletti]

The build scripts turn off Ganesh if webgpu is specified and enables Graphite instead. So that's been taken care of.

[Bruno Nicoletti]

Digging around a bit more it looks like the webgpu is an incomplete work in progress. There are a whole bunch of missing functions it relies on, for example `GrDirectContext::MakeDawn` doesn't exist anywhere I can find in the code base.

There is a note that seems to imply the work is being left until an emscripten bindings are available for webgpu. In which case I'll just ignore it and rely on webgl for my own work.

[Brian Salomon]

Ganesh (GrDirectContext, etc) does not support WebGPU. There was an incomplete implementation that has been deleted. The newer GPU backend, Graphite (skgpu::graphite::Context skgpu::graphite::Recorder, etc), does work on webgpu. However, there are no CanvasKit or other JS bindings provided with Skia.

Brian

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[Bruno Nicoletti]

Thank you. I might have a dig around at some point later on.

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