Kevin Lubick
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262dfbafb4
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[experimental] Add WebGPU demo (built with Bazel)
This uses the Bazel rule wasm_cc_binary, which is defined
in @emsdk [1]
Note that wasm_cc_binary does not have a linkopts argument
defined, so we instead put any emcc options in the cc_binary
target.
This works around a few bugs in the emsdk Bazel rules:
- https://github.com/emscripten-core/emsdk/issues/907
- https://github.com/emscripten-core/emsdk/issues/807
Prior to PS 5, this CL tried a different way to bring in
the toolchain, a more manual way outlined in [2].
A similar approach (modifying the .bazelrc and specifying
the toolchain directly) might be necessary at some point,
but can probably still be done using the @emsdk Bazel rules
and --config=wasm.
To update the version of emscripten used, we just need to
update the parameter in the WORKSPACE call to emsdk_emscripten_deps().
The example/index.html file in this CL does exactly the same
as [3], except the WebGPU calls are made from C++ via WASM.
I made heavy use of these examples [4], [5] while exploring
APIs. What was also useful was looking at the emscripten
source headers [6], [7], [8], [9].
I also learned a lot about WebGPU from [10].
[1] 3891e7b04b/bazel/emscripten_toolchain/wasm_cc_binary.bzl
[2] https://hackernoon.com/c-to-webassembly-using-bazel-and-emscripten-4him3ymc
[3] 206c1f3f7e/demos.skia.org/demos/webgpu/index.html
[4] https://github.com/kainino0x/webgpu-cross-platform-demo
[5] https://github.com/Twinklebear/wgpu-cpp-starter
[6] 5e6c74153b/system/include/emscripten/html5_webgpu.h
[7] 5e6c74153b/system/include/webgpu/webgpu.h
[8] 5e6c74153b/system/include/webgpu/webgpu_cpp.h
[9] 5e6c74153b/src/library_html5_webgpu.js (L24)
[10] https://alain.xyz/blog/raw-webgpu
Change-Id: Iff33b72e7265200b2caacbc03e5fcc06a650b56b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/457396
Reviewed-by: Leandro Lovisolo <lovisolo@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
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2021-10-12 18:34:55 +00:00 |
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