Import Tint changes from Dawn

  - e6c03a3799922151e821c57a69c78b5e422ac2a5 tint/reader/wgsl: Lex abstract floats by Ben Clayton <>
  - a644c3d835a4011d8d05454d061f391603df7bc1 tint/reader/wgsl: Use C++17 hex floats for tests by Ben Clayton <>
  - 30f01c17908bc5d18371f122b2e594dc30f40b98 tint/reader/wgsl: Lex abstract hex floats by Ben Clayton <>
  - 09373989ecf3bb551565f2caf7016cb7ed0b7957 tint: Clamp constants to type's limits when number is unr... by Ben Clayton <>
  - ce6adf4c678102197e5bd8b3bfa0a34b2df48b48 tint: Implement DP4a on SPIR-V writer by Jiawei Shao <>
  - 8ae9e94344d38ca38723b9b56e2b4c047faaff48 tint/reader/wgsl: Restructure Lexer::try_hex_float() cons... by Ben Clayton <>
  - 3ad927cc73dac935f5435f8b1f2855f0ea289b31 tint/writer: Check for inf / nan after casting to f32. by Ben Clayton <>
  - e34e059804709726e9cbd35547c3ff857924af33 tint/resolver: Ensure materialized values are representable by Ben Clayton <>
  - a8d52280494492a00b7ca6312ca9f69eef3fdd6a tint/resolver: Add `DataType<T>::ElementType` typedef by Ben Clayton <>
  - 6ae7c0601760acc3309580d5ca5d24e3799a846e tint/resolver: Change DataType<T>::Expr() value type to d... by Ben Clayton <>
  - 9707e6bb38c249e49e372b46bd8492d32e20315d tint: Rework sem::Constant to be variant-of-vector by Ben Clayton <>
  - ef702af6c8b8d12ec5695e5600f0ef4844dd73d3 tint/reader/wgsl: Use CheckedConvert() for lexing by Ben Clayton <>
  - c2eccfc887def447e2f1833408674095ad7d0443 tint: Add more helpers to tint::Number by Ben Clayton <>
  - 3c83be8a5b34ef9c506e151b8736281f5df07877 tint: Add utils::Result by Ben Clayton <>
  - 3bb360f0bb91695d1fe85624a8ef9d70e857c632 tint: Add utils::TransformN() by Ben Clayton <>
GitOrigin-RevId: e6c03a3799922151e821c57a69c78b5e422ac2a5
Change-Id: I91304c07aa556f5f1d84a1003c078204ad76f5df
Commit-Queue: Ben Clayton <>
Kokoro: Kokoro <>
Reviewed-by: Ben Clayton <>
33 files changed
tree: 6d510836b8136c6579b6e58918718a85492a70d7
  1. .vscode/
  2. build_overrides/
  3. docs/
  4. include/
  5. infra/
  6. kokoro/
  7. src/
  8. test/
  9. third_party/
  10. tools/
  11. .clang-format
  12. .gitignore
  13. .gn
  16. CMakeLists.txt
  17. CMakeSettings.json
  19. CPPLINT.cfg
  20. DEPS
  21. Doxyfile
  23. OWNERS
  26. standalone.gclient
  27. tint_overrides_with_defaults.gni


Note: This repo is read-only, minimized mirror of the Dawn repo.

Tint changes should be made in the Dawn repo.

Tint is a compiler for the WebGPU Shader Language (WGSL).

This is not an officially supported Google product.


  • Git
  • CMake (3.10.2 or later)
  • Ninja (or other build tool)
  • Python, for fetching dependencies
  • depot_tools in your path

Build options

  • TINT_BUILD_SPV_READER : enable the SPIR-V input reader (off by default)
  • TINT_BUILD_WGSL_READER : enable the WGSL input reader (on by default)
  • TINT_BUILD_SPV_WRITER : enable the SPIR-V output writer (on by default)
  • TINT_BUILD_WGSL_WRITER : enable the WGSL output writer (on by default)
  • TINT_BUILD_FUZZERS : enable building fuzzzers (off by default)


Tint uses Chromium dependency management so you need to install depot_tools and add it to your PATH.

Getting source & dependencies

# Clone the repo as "tint"
git clone tint
cd tint

# Bootstrap the gclient configuration
cp standalone.gclient .gclient

# Fetch external dependencies and toolchains with gclient
gclient sync

Compiling using CMake + Ninja

mkdir -p out/Debug
cd out/Debug
cmake -GNinja ../..
ninja # or autoninja

Compiling using CMake + make

mkdir -p out/Debug
cd out/Debug
cmake ../..
make # -j N for N-way parallel build

Compiling using gn + ninja

mkdir -p out/Debug
gn gen out/Debug
autoninja -C out/Debug

Fuzzers on MacOS

If you are attempting fuzz, using TINT_BUILD_FUZZERS=ON, the version of llvm in the XCode SDK does not have the needed libfuzzer functionality included.

The build error that you will see from using the XCode SDK will look something like this:

ld: file not found:/Applications/

The solution to this problem is to use a full version llvm, like what you would get via homebrew, brew install llvm, and use something like CC=<path to full clang> cmake .. to setup a build using that toolchain.

Checking [chromium-style] issues in CMake builds

The gn based work flow uses the Chromium toolchain for building in anticipation of integration of Tint into Chromium based projects. This toolchain has additional plugins for checking for style issues, which are marked with [chromium-style] in log messages. This means that this toolchain is more strict then the default clang toolchain.

In the future we will have a CQ that will build this work flow and flag issues automatically. Until that is in place, to avoid causing breakages you can run the [chromium-style] checks using the CMake based work flows. This requires setting CC to the version of clang checked out by gclient sync and setting the TINT_CHECK_CHROMIUM_STYLE to ON.

mkdir -p out/style
cd out/style
cmake ../..
CC=../../third_party/llvm-build/Release+Asserts/bin/clang cmake -DTINT_CHECK_CHROMIUM_STYLE=ON ../../ # add -GNinja for ninja builds


Please file any issues or feature requests at


Please see the contributing guide in the Dawn repo.