What is webGPU support in Emscripten?

[yangfangfang1204]

In Emscripten release notes , v1.39.8: 02/14/2020

• WebGPU Compute fixes. Simple examples now work. See WebGPU Compute fixes #10367.

so In Emscripten， What is webGPU support ？ support GPU compute ？ and how i use it to calculation of acceleration matrix ? if there is some demo ?

Another question : Whether Emscripten supports WebGPU rendering ? and how i use it to improved rendering performance ?

[yangfangfang1204]

Dawn is a C++ implementation of WebGPU used in Chromium. It can be used to target WebGPU in C and C++ applications that can then be ported to WebAssembly using Emscripten and automatically take advantage of WebGPU in the browser.

so the Dawn support webgpu renderPipeline ?

[kainino0x]

so the Dawn support webgpu renderPipeline ?

Yes, when you use the C API for WebGPU render pipelines it will be translated to the browser's API.

[kainino0x]

WebGPU support in Emscripten is the implementation of webgpu.h (https://github.com/webgpu-native/webgpu-headers/blob/main/webgpu.h) on top of the browser-exposed WebGPU API (https://gpuweb.github.io/gpuweb/).

WebGPU is still under development and not yet exposed by default in browsers.
More info and sample links here: https://github.com/gpuweb/gpuweb/wiki/Implementation-Status#materials

JavaScript WebGPU samples: https://austin-eng.com/webgpu-samples/
Extremely minimal demo of an application using webgpu.h to target web through Emscripten: https://github.com/kainino0x/webgpu-cross-platform-demo

WebGPU support in Emscripten doesn't affect or enhance any applications that aren't using themselves using WebGPU directly. So you won't get improved rendering performance/features without adding engine support for a WebGPU rendering backend.

Hope this helps!

[FuXiii]

Where can find the document about WebGPU in Emscripten and some function like WGPUDevice emscripten_webgpu_get_device(void) in html5_webgpu.h ?

(Ｔ▽Ｔ)

[kainino0x]

If you haven't seen it yet, this newly published article should be very helpful: https://developer.chrome.com/blog/webgpu-cross-platform/

emscripten_webgpu_get_device is deprecated. It's only for use with preinitializedWebGPUDevice which is going to be removed. It was needed in early prototypes because when we started we didn't have working implementations for requestAdapter/requestDevice in some cases, but it hasn't been a priority to clean up. (You can see what it does, it's quite simple:
https://github.com/search?q=repo%3Aemscripten-core%2Femscripten%20emscripten_webgpu_get_device&type=code)