CMake-only fork of https://dawn.googlesource.com/dawn with cleaned, vendored dependencies
6cbe015429
Signaling a fence in Dawn without waiting can cause a race between Dawn and Chromium over who signals the fence. Since D3D12 fences are allowed to be rewound this can cause future waits to hang indefinitely if Dawn loses the race and signals a lower value than what Chromium expects. The signal without wait case happens when Dawn submits no command lists e.g. when CopyExternalImageToTexture uses a zero-sized dimension. This is the reason for the test failures in https://crrev.com/c/3700811 e.g. https://ci.chromium.org/ui/p/chromium/builders/try/dawn-win10-x64-deps-rel/24617/overview To fix the race, it's sufficient to wait before signaling if not already waited which is what this CL does. This CL also makes the fence stay alive until pending signals are done - this wasn't the root cause of the hang described above, but it's still a good idea for robustness, and also recommended based on discussion around past Chromium XR fence use. Bug: dawn:576 Change-Id: I8c1d1a19fdb022ae28d26f6723c2f2bfc9c1c3c7 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/96321 Auto-Submit: Sunny Sachanandani <sunnyps@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Kokoro: Kokoro <noreply+kokoro@google.com> Reviewed-by: Austin Eng <enga@chromium.org> Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org> |
||
|---|---|---|
| .vscode | ||
| build_overrides | ||
| docs | ||
| generator | ||
| include | ||
| infra | ||
| scripts | ||
| src | ||
| test | ||
| third_party | ||
| tools | ||
| webgpu-cts | ||
| .clang-format | ||
| .clang-tidy | ||
| .gitattributes | ||
| .gitignore | ||
| .gn | ||
| AUTHORS | ||
| BUILD.gn | ||
| CMakeLists.txt | ||
| CMakeSettings.json | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| CPPLINT.cfg | ||
| DEPS | ||
| DIR_METADATA | ||
| Doxyfile | ||
| LICENSE | ||
| OWNERS | ||
| PRESUBMIT.py | ||
| README.chromium | ||
| README.md | ||
| codereview.settings | ||
| dawn.json | ||
| dawn_wire.json | ||
| go.mod | ||
| go.sum | ||
| tint_overrides_with_defaults.gni | ||
README.md
Dawn, a WebGPU implementation
Dawn is an open-source and cross-platform implementation of the work-in-progress WebGPU standard.
More precisely it implements webgpu.h that is a one-to-one mapping with the WebGPU IDL.
Dawn is meant to be integrated as part of a larger system and is the underlying implementation of WebGPU in Chromium.
Dawn provides several WebGPU building blocks:
- WebGPU C/C++ headers that applications and other building blocks use.
- The
webgpu.hversion that Dawn implements. - A C++ wrapper for the
webgpu.h.
- The
- A "native" implementation of WebGPU using platforms' GPU APIs:
- D3D12 on Windows 10
- Metal on macOS and iOS
- Vulkan on Windows, Linux, ChromeOS, Android and Fuchsia
- OpenGL as best effort where available
- A client-server implementation of WebGPU for applications that are in a sandbox without access to native drivers
- Tint is a compiler for the WebGPU Shader Language (WGSL).
Helpful links:
- Dawn bug tracker if you find issues with Dawn.
- Tint bug tracker if you find issues with Tint.
- Dawn's mailing list for other discussions related to Dawn.
- Dawn's source code
- Dawn's Matrix chatroom for live discussion around contributing or using Dawn.
- WebGPU's Matrix chatroom
- Tint mirror for standalone usage.
Documentation table of content
Developer documentation:
- Dawn overview
- Building
- Contributing
- Code of Conduct
- Testing Dawn
- Debugging Dawn
- Dawn's infrastructure
- Dawn errors
- Tint experimental extensions
User documentation: (TODO, figure out what overlaps with the webgpu.h docs)
Status
(TODO)
License
Apache 2.0 Public License, please see LICENSE.
Disclaimer
This is not an officially supported Google product.