"emdawnwebgpu" (Dawn's fork of Emscripten's WebGPU bindings)

"emdawnwebgpu" is Dawn's fork of the Emscripten WebGPU bindings (library_webgpu.js and friends). The forked files live in //third_party/emdawnwebgpu and the build targets in this directory produce the other files needed to build an Emscripten-based project using these bindings.

We keep the webgpu.h interface roughly in sync between Dawn and emdawnwebgpu, however we don't guarantee it will always be in sync - we don't have any automated testing for this, so we'll periodically fix it up as needed for import into other projects that use these bindings.

Projects should use this fork (by compiling Dawn as instructed below) if they want the latest version, which is mostly compatible with the same version of Dawn Native. For the future of this fork, please see https://crbug.com/371024051.

Using emdawnwebgpu pre-built releases

Pre-built releases are published at https://github.com/google/dawn/releases. See the included README on how to use them.

TODO(crbug.com/371024051): Link to a sample project in that README.

Instructions are provided below on how to build the package yourself, as well as samples that exercise the bindings.

If for any reason you don't want to use the package, it's also possible to build emdawnwebgpu as a subproject of a CMake or gn project.

Building emdawnwebgpu and emdawnwebgpu_pkg

First, get the Dawn code and its dependencies. See building.md.

To build the package, you'll build Dawn's emdawnwebgpu_pkg target using Emscripten. out/yourbuild/emdawnwebgpu_pkg combines files from:

src/emdawnwebgpu
third_party/emdawnwebgpu
out/yourbuild/gen

Set up Emscripten

Get an emsdk toolchain (at least Emscripten 4.0.3, which includes the necessary tools in the package release). There are two options to do this:

Set the dawn_wasm gclient variable (use standalone-with-wasm.gclient as your .gclient), and gclient sync. This installs emsdk in //third_party/emsdk.
Install it manually following the official instructions.

Standalone with CMake

Set up the build directory using emcmake:

mkdir out/cmake-wasm
cd out/cmake-wasm

path/to/emsdk/upstream/emscripten/emcmake cmake ../..

# Package
make -j8 emdawnwebgpu_pkg

Samples and tests:

# Samples (for a list of samples, see ENABLE_EMSCRIPTEN targets in src/dawn/samples/CMakeLists.txt)
make -j8 HelloTriangle

# Tests
make -j8 emdawnwebgpu_tests_asyncify emdawnwebgpu_tests_jspi

(To use Ninja instead of Make, for better parallelism, add -GNinja to the cmake invocation, and build using ninja.)

Samples and tests produce HTML files which can be served and viewed in a compatible browser.

Standalone with GN

Set up Emscripten as per instructions above using dawn_wasm.
Build the emdawnwebgpu and samples GN build targets.

Samples and tests produce HTML files in out/<dir>/wasm which can be served and viewed in a compatible browser.

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