| commit | 6b164c337c647c0898a0e54cdb260f0ee91ae4a6 | [log] [tgz] |
|---|---|---|
| author | Alexis Hetu <sugoi@google.com> | Wed Sep 20 11:24:52 2017 -0400 |
| committer | Alexis Hétu <sugoi@google.com> | Thu Sep 21 18:02:59 2017 +0000 |
| tree | 050ee4247b8bb58d4b8bb0bcb532b1c6e67e63be | |
| parent | 0c5035bec3bfdd41c38b55c7880e63bea8347e43 [diff] |
Use atomic operations to specify shared memory access order TSAN detected many data race errors in the SwiftShader Renderer class. x86 has a strong memory ordering model which guarantees that changes are observed in the same order by other threads. However, C++ does not provide such guarantees unless specified using atomic operations. In order to fix these, a new AtomicInt class was added which is a basically a wrapper class for std::atomic<int> and which only exposes the portion of the API required by SwiftShader. Since std::atomic isn't available on older versions of Android, a fallback class was implemented without using std::atomic, which is closer to the previous implementation. Both classes appear to work properly after performing a few dEQP tests. Both also perform similarly. A few minor changes were made in order to attempt to reduce the use of atomic integer operations when possible. Change-Id: Ife6d3a2b6113346f8f8163b692e79c2a0e03b22f Reviewed-on: https://swiftshader-review.googlesource.com/12308 Reviewed-by: Nicolas Capens <nicolascapens@google.com> Tested-by: Nicolas Capens <nicolascapens@google.com>
SwiftShader is a high-performance CPU-based implementation of the OpenGL ES and Direct3D 9 graphics APIs12. Its goal is to provide hardware independence for advanced 3D graphics.
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.
Prebuilt binaries can be found at: https://goo.gl/5MOcdb
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
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. To clone the repository and install the commit hook in one go:
git clone https://swiftshader.googlesource.com/SwiftShader && (cd SwiftShader && curl -Lo `git rev-parse --git-dir`/hooks/commit-msg https://gerrit-review.googlesource.com/tools/hooks/commit-msg ; chmod +x `git rev-parse --git-dir`/hooks/commit-msg)
Changes are uploaded to Gerrit by performing:
git push origin HEAD:refs/for/master
The third_party directory contains projects which originated outside of SwiftShader:
LLVM contains an outdated and diverged copy of the LLVM compiler framework. Until further notice, maintenance fixes can be made directly in the SwiftShader repository.
subzero contains a fork of the Subzero project. It is part of Google Chrome‘s (Portable) Native Client project. Its authoritative source is at https://chromium.googlesource.com/native_client/pnacl-subzero/. The fork was made using git-subtree to include all of Subzero’s history, and until further notice it should not diverge from the upstream project. Contributions must be tested using the README instructions, reviewed at https://chromium-review.googlesource.com, and then pulled into the SwiftShader repository.
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.
See docs/Index.md.
Public mailing list: swiftshader@googlegroups.com
Bug tracker: https://bugs.chromium.org/p/swiftshader
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.
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.