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Currently Dawn ignores all zero-attribute vertex buffer in the given pipeline descriptor when creating RenderPipelineBase because zero-attribute vertex buffer is treated as unused slot, however the spec doesn't state that zero-attribute vertex buffer should be ignored. To support zero-attribute vertex buffer, this commit has the following changes. 1. Add VertexBufferNotUsed enum value to wgpu::VertexStepMode to represent unused slots 2. Ignore VertexBufferNotUsed step mode buffers when creating RenderPipelineBase and add tests to check it 3. Record zero-attribute vertex buffers when creating RenderPipelineBase and add tests to check it 4. Fix VertexStateTest::LastAllowedVertexBuffer broken by the above changes Temporarily we set the enum value of wgpu::VertexStepMode::VertexBufferNotUsed to 0 to pass the CTS tests because currently empty vertex buffer slots step mode can be zero-initialized. We will make a CL to Blink to explicitly set wgpu::VertexStepMode::VertexBufferNotUsed for empty slots and change the enum value to 2. Bug: dawn:1000 Change-Id: Ibd4ab87f2c922e8e460f2311547f13d58f1d5611 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/89340 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Kokoro: Kokoro <noreply+kokoro@google.com> Commit-Queue: Takahiro <hogehoge@gachapin.jp>
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.