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gerrit-public.fairphone.software / platform / external / swiftshader / e068963d1dcf8e5bd4e940ca76edbd19abab9d44
commite068963d1dcf8e5bd4e940ca76edbd19abab9d44[log] [tgz]
authorNicolas Capens <capn@google.com>Tue Oct 20 01:28:38 2020 -0400
committerNicolas Capens <nicolascapens@google.com>Wed Nov 17 01:07:51 2021 +0000
tree89971a701279f61c7ed5d08da95ff40baa6e4714
parent0f6b833bc7610538766018326d525ec2307df998 [diff]
Add support for VK_FORMAT_B8G8R8A8_UNORM|SRGB as storage image formats

Note that at the time of writing the Vulkan specification does not allow
OpImageRead or OpImageWrite on formats other than those in the "Formats
without shader storage format" list, which does not include B8G8R8A8
formats. The only exception is OpImageRead where the image's Dim is
SubpassData (indicating a read from an input attachment), which has no
format restrictions besides what's reported to be supported.

Due to the popularity of B8G8R8A8 on certain platforms, we believe the
restriction on storage images to be in error. This is followed up on at
https://gitlab.khronos.org/vulkan/vulkan/-/issues/1301

Tests: dEQP-VK.*b8g8r8a8*
Bug: b/170414896
Bug: b/203559509
Change-Id: Ic8d35bcb2577a2760218c500c257da3a631d9534
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/49409
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Sean Risser <srisser@google.com>
2 files changed
tree: 89971a701279f61c7ed5d08da95ff40baa6e4714
  1. .vscode/
  2. build/
  3. build_overrides/
  4. docs/
  5. extensions/
  6. include/
  7. infra/
  8. src/
  9. tests/
  10. third_party/
  11. tools/
  12. .clang-format
  13. .dir-locals.el
  14. .gitignore
  15. .gitmodules
  16. Android.bp
  17. AUTHORS.txt
  18. BUILD.gn
  19. CMakeLists.txt
  20. CMakeSettings.json
  21. codereview.settings
  22. CONTRIBUTING.txt
  23. CONTRIBUTORS.txt
  24. DIR_METADATA
  25. LICENSE.txt
  26. OWNERS
  27. README.md
README.md

SwiftShader

License

Introduction

SwiftShader is a high-performance CPU-based implementation of the Vulkan graphics API12. Its goal is to provide hardware independence for advanced 3D graphics.

NOTE: SwiftShader's OpenGL ES implementation is no longer supported, and will be removed. Read more about our recommendation to use ANGLE on top of SwiftShader Vulkan here (aka. "SwANGLE").

Building

SwiftShader libraries can be built for Windows, Linux, and macOS.
Android and Chrome (OS) build environments are also supported.

  • CMake
    Install CMake for Linux, macOS, or Windows and use either the GUI or run the following terminal commands:

    cd build
cmake ..
cmake --build . --parallel

./vk-unittests

    Tip: Set the CMAKE_BUILD_PARALLEL_LEVEL environment variable to control the level of parallelism.

  • Visual Studio
    To build the Vulkan ICD library, use Visual Studio 2019 to open the project folder and wait for it to run CMake. Open the CMake Targets View in the Solution Explorer and select the vk_swiftshader project to build it.

Usage

The SwiftShader libraries act as drop-in replacements for graphics drivers.

On Windows, most applications can be made to use SwiftShader's DLLs by placing them in the same folder as the executable. On Linux, the LD_LIBRARY_PATH environment variable or -rpath linker option can be used to direct applications to search for shared libraries in the indicated directory first.

In general, Vulkan applications look for a shared library named vulkan-1.dll on Windows (vulkan-1.so on Linux). This 'loader' library then redirects API calls to the actual Installable Client Driver (ICD). SwiftShader's ICD is named libvk_swiftshader.dll, but it can be renamed to vulkan-1.dll to be loaded directly by the application. Alternatively, you can set the VK_ICD_FILENAMES environment variable to the path to vk_swiftshader_icd.json file that is generated under the build directory (e.g. .\SwiftShader\build\Windows\vk_swiftshader_icd.json). To learn more about how Vulkan loading works, read the official documentation here.

Contributing

See CONTRIBUTING.txt for important contributing requirements.

The canonical repository for SwiftShader is hosted at: https://swiftshader.googlesource.com/SwiftShader.

All changes must be reviewed and approved in the Gerrit review tool at: https://swiftshader-review.googlesource.com.

Authenticate your account here: https://swiftshader-review.googlesource.com/new-password (use the same e-mail address as the one configured as the Git commit author).

All changes require a Change-ID tag in the commit message. A commit hook may be used to add this tag automatically, and can be found at: https://gerrit-review.googlesource.com/tools/hooks/commit-msg. You can execute git clone https://swiftshader.googlesource.com/SwiftShader and manually place the commit hook in SwiftShader/.git/hooks/, or to clone the repository and install the commit hook in one go:

git clone https://swiftshader.googlesource.com/SwiftShader && (cd SwiftShader && git submodule update --init --recursive third_party/git-hooks && ./third_party/git-hooks/install_hooks.sh)

On Windows, this command line requires using the Git Bash Shell.

Changes are uploaded to Gerrit by executing:

git push origin HEAD:refs/for/master

When ready, add a project owner as a reviewer on your change.

Some tests will automatically be run against the change. Notably, presubmit.sh verifies the change has been formatted using clang-format 11.0.1. Most IDEs come with clang-format support, but may require upgrading/downgrading to the clang-format version 11.0.0 release version (notably Chromium's buildtools has a clang-format binary which can be an in-between revision which produces different formatting results).

Testing

SwiftShader's Vulkan implementation can be tested using the dEQP test suite.

See docs/dEQP.md for details.

Third-Party Dependencies

The third_party directory contains projects which originated outside of SwiftShader:

subzero contains a fork of the Subzero project. It originates from Google Chrome's (Portable) Native Client project. The fork was made using git-subtree to include all of Subzero's history.

llvm-subzero contains a minimized set of LLVM dependencies of the Subzero project.

PowerVR_SDK contains a subset of the PowerVR Graphics Native SDK for running several sample applications.

googletest contains the Google Test project, as a Git submodule. It is used for running unit tests for Chromium, and Reactor unit tests. Run git submodule update --init to obtain/update the code. Any contributions should be made upstream.

Documentation

See docs/Index.md.

Contact

Public mailing list: swiftshader@googlegroups.com

General bug tracker: https://g.co/swiftshaderbugs
Chrome specific bugs: https://bugs.chromium.org/p/swiftshader

License

The SwiftShader project is licensed under the Apache License Version 2.0. You can find a copy of it in LICENSE.txt.

Files in the third_party folder are subject to their respective license.

Authors and Contributors

The legal authors for copyright purposes are listed in AUTHORS.txt.

CONTRIBUTORS.txt contains a list of names of individuals who have contributed to SwiftShader. If you're not on the list, but you've signed the Google CLA and have contributed more than a formatting change, feel free to request to be added.

Disclaimer

  1. Trademarks are the property of their respective owners.
  2. This is not an official Google product.