| commit | 2a87c84c56a209bfa67f7076c9fd9a65f4344ee0 | [log] [tgz] |
|---|---|---|
| author | Yunchao He <yunchao.he@intel.com> | Sat Apr 02 00:18:00 2022 +0000 |
| committer | Dawn LUCI CQ <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com> | Sat Apr 02 00:18:00 2022 +0000 |
| tree | 84a03b2be5d5f84b20fda0c1621e608646c168f0 | |
| parent | 42e76ba82a23adc059f33de300e4872ffc95e6d4 [diff] |
Add end2end tests to expose buffer size error on D3D12
When we do B2T or T2B copy from/to a buffer with paddings,
D3D12 may wrongly calculate the required buffer size.
For example, if copySize = {1, 1, 2}, offset = 0, bytesPerRow =
256, and rowsPerImage = 2 (there is 1-row padding for every image),
and we are copying a non-compressed format like rgba8unorm,
the required minimum buffer size should be:
offset + bytesPerRow * rowsPerImage * (copySize.depthOrArrayLayers - 1)
+ bytesPerRow * (copySize.height - 1) + bytesPerBlock * copySize.width.
It is 0 + 256 * 2 * (2 - 1) + 256 * (1 - 1) + 4 * 1 = 516.
The required minimum buffer on D3D12 (including WARP) size is:
offset + bytesPerRow * rowsPerImage * (copySize.depthOrArrayLayers - 1)
+ bytesPerRow * (rowsPerImage - 1) + bytesPerBlock * copySize.width.
Or offset + bytesPerRow * rowsPerImage * copySize.depthOrArrayLayers
+ bytesPerBlock * copySize.width - bytesPerRow.
It is 0 + 256 * 2 * (2 - 1) + 256 * (2 - 1) + 4 * 1 = 772.
It looks like D3D12 requires unnecessary buffer storage for
rowsPerImagePadding in the last image. It does respect
bytesPerRowPadding in the last row and doesn't require storage for
that part, though.
You can verify the buffer size requirement on D3D12 backend with the
new tests via --enable-backend-validation. The validation layer
says that D3D12 requires 772 bytes but we only provide a 516-bytes
buffer, and leads to E_INVALIDARG (Error code 0x80070057) when run
mD3d12CommandList->Close() in CommandRecordingContext::ExecuteCommandList
and causes device lost.
Bug: dawn:1278, dawn:1288, dawn:1289
Change-Id: Icfb792dec60ff7444cb20b3c283709cdb165f80a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/85341
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Yunchao He <yunchao.he@intel.com>
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.h version that Dawn implements.webgpu.h.Helpful links:
Developer documentation:
User documentation: (TODO, figure out what overlaps with the webgpu.h docs)
(TODO)
Apache 2.0 Public License, please see LICENSE.
This is not an officially supported Google product.