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Add WASM target in gn (flutter#31670)
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Harry Terkelsen
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Mar 16, 2022
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| Signature: 270842a9eb9687ced20abdf5f131bafd | ||
| Signature: 5efe7843d99ba138e2bb7dac2441b5b8 | ||
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| # Copyright 2022 The Flutter Authors. All rights reserved. | ||
| # Use of this source code is governed by a BSD-style license that can be | ||
| # found in the LICENSE file. | ||
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| group("canvaskit") { | ||
| deps = [ "//third_party/skia/modules/canvaskit" ] | ||
| } |
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@@ -265,6 +265,59 @@ environment variable: | |
| FELT_USE_SNAPSHOT=false felt <command> | ||
| ``` | ||
| ## Building CanvasKit | ||
| To build CanvasKit locally, you must first set up your gclient config to | ||
| activate the Emscripten SDK, which is the toolchain used to build CanvasKit. | ||
| To do this, replace the contents of your .gclient file at the root of the | ||
| project (i.e. in the parent directory of the `src` directory) with: | ||
| ``` | ||
| solutions = [ | ||
| { | ||
| "managed": False, | ||
| "name": "src/flutter", | ||
| "url": "[email protected]:<your_username_here>/engine.git", | ||
| "custom_deps": {}, | ||
| "deps_file": "DEPS", | ||
| "safesync_url": "", | ||
| "custom_vars": { | ||
| "download_emsdk": True, | ||
| }, | ||
| }, | ||
| ] | ||
| ``` | ||
| Now run `gclient sync` and it should pull in the Emscripten SDK and activate it. | ||
| To build CanvasKit with `felt`, run: | ||
| ``` | ||
| felt build --build-canvaskit | ||
| ``` | ||
| This will build CanvasKit in `out/wasm_debug`. If you now run | ||
| ``` | ||
| felt test | ||
| ``` | ||
| it will detect that you have built CanvasKit and use that instead of the one | ||
| from CIPD to run the tests against. | ||
| ### Upgrading the Emscripten SDK for the CanvasKit build | ||
| The version of the Emscripten SDK should be kept up to date with the version | ||
| used in the Skia build. That version can be found in | ||
| `third_party/skia/bin/activate-emsdk`. It will probably also be necessary to | ||
| roll the dependency on `third_party/emsdk` in DEPS to the same version as in | ||
| `third_party/skia/DEPS`. | ||
| Once you know the version for the Emscripten SDK, change the line in | ||
| `tools/activate_emsdk.py` which defines `EMSDK_VERSION` to match Skia. | ||
| [1]: https://github.com/flutter/flutter/wiki/Setting-up-the-Engine-development-environment | ||
| [2]: https://github.com/flutter/engine/blob/main/lib/web_ui/dev/browser_lock.yaml | ||
| [4]: https://chrome-infra-packages.appspot.com/p/flutter_internal | ||
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