| commit | 96445fe36c80c3cb5443a29be673bedb7ad2fb2f | [log] [tgz] |
|---|---|---|
| author | Nicolas Capens <capn@google.com> | Thu Dec 15 14:45:13 2016 -0500 |
| committer | Nicolas Capens <capn@google.com> | Mon Jan 16 18:54:27 2017 +0000 |
| tree | 569ada158787c2f62cd609f7de5260ad6688e5cf | |
| parent | 1675f9f5267812ab84bd70c16c12d35ef0e2dfd8 [diff] |
Manually convert unsigned integer to floating-point. Subzero uses a helper function to convert uint to float. It's faster to just emit a sequence of operations to perform the cast manually. This implementation converts the lower 31 bits as a signed integer, and adds 0x80000000 as a floating-point value when the upper bit is set. This approach does not produce the correct rounding in rare cases, but should still be adequate. For consistency, we're also using this method with the LLVM back-end. Change-Id: Ic5d7b73cd2a9e154056365cdbe9af0962bdbe1cb Reviewed-on: https://swiftshader-review.googlesource.com/8312 Tested-by: Nicolas Capens <capn@google.com> Reviewed-by: Alexis Hétu <sugoi@google.com> Reviewed-by: Nicolas Capens <capn@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
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.