1# SwiftShader 2 3[](https://opensource.org/licenses/Apache-2.0) 4 5Introduction 6------------ 7 8SwiftShader is a high-performance CPU-based implementation of the Vulkan graphics API<sup>1</sup><sup>2</sup>. Its goal is to provide hardware independence for advanced 3D graphics. 9 10> NOTE: SwiftShader's OpenGL ES frontend is no longer supported, and will eventually be removed. Read more about our recommendation to use [ANGLE on top of SwiftShader Vulkan here](ANGLE.md). 11 12Building 13-------- 14 15SwiftShader libraries can be built for Windows, Linux, and macOS.\ 16Android and Chrome (OS) build environments are also supported. 17 18* **CMake** 19\ 20 [Install CMake](https://cmake.org/download/) for Linux, macOS, or Windows and use either [the GUI](https://cmake.org/runningcmake/) or run the following terminal commands: 21 ``` 22 cd build 23 cmake .. 24 cmake --build . --parallel 25 26 ./vk-unittests 27 ``` 28 Tip: Set the [CMAKE_BUILD_PARALLEL_LEVEL](https://cmake.org/cmake/help/latest/envvar/.CMAKE_BUILD_PARALLEL_LEVEL.html#envvar:CMAKE_BUILD_PARALLEL_LEVEL) environment variable to control the level of parallelism. 29 30 31* **Visual Studio** 32\ 33 To build the Vulkan ICD library, use [Visual Studio 2019](https://visualstudio.microsoft.com/vs/community/) to open the project folder and wait for it to run CMake. Open the [CMake Targets View](https://docs.microsoft.com/en-us/cpp/build/cmake-projects-in-visual-studio?view=vs-2019#ide-integration) in the Solution Explorer and select the vk_swiftshader project to [build](https://docs.microsoft.com/en-us/cpp/build/cmake-projects-in-visual-studio?view=vs-2019#building-cmake-projects) it. 34 35 36Usage 37----- 38 39The SwiftShader libraries act as drop-in replacements for graphics drivers. 40 41On 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. 42 43In 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](https://github.com/KhronosGroup/Vulkan-Loader/blob/master/loader/LoaderAndLayerInterface.md). 44 45Contributing 46------------ 47 48See [CONTRIBUTING.txt](CONTRIBUTING.txt) for important contributing requirements. 49 50The canonical repository for SwiftShader is hosted at: 51https://swiftshader.googlesource.com/SwiftShader 52 53All changes must be reviewed and approved in the [Gerrit](https://www.gerritcodereview.com/) review tool at: 54https://swiftshader-review.googlesource.com 55 56Authenticate your account here: 57https://swiftshader-review.googlesource.com/new-password 58 59All changes require a [Change-ID](https://gerrit-review.googlesource.com/Documentation/user-changeid.html) tag in the commit message. A commit hook may be used to add this tag automatically, and can be found at: 60https://gerrit-review.googlesource.com/tools/hooks/commit-msg. To clone the repository and install the commit hook in one go: 61 62 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) 63 64Changes are uploaded to Gerrit by executing: 65 66 git push origin HEAD:refs/for/master 67 68When ready, [add](https://gerrit-review.googlesource.com/Documentation/intro-user.html#adding-reviewers) a project [owner](OWNERS) as a reviewer on your change. 69 70Some tests will automatically be run against the change. Notably, [presubmit.sh](tests/presubmit.sh) verifies the change has been formatted using [clang-format 10.0](tests/kokoro/gcp_ubuntu/check_style.sh). Most IDEs come with clang-format support, but may require downgrading to [clang-format version 10.0](https://github.com/llvm/llvm-project/releases/tag/llvmorg-10.0.0). 71 72Testing 73------- 74 75SwiftShader's OpenGL ES implementation can be tested using the [dEQP](https://github.com/KhronosGroup/VK-GL-CTS) test suite. 76 77See [docs/dEQP.md](docs/dEQP.md) for details. 78 79Third-Party Dependencies 80------------------------ 81 82The [third_party](third_party/) directory contains projects which originated outside of SwiftShader: 83 84[subzero](third_party/subzero/) contains a fork of the [Subzero](https://chromium.googlesource.com/native_client/pnacl-subzero/) project. It originates from Google Chrome's (Portable) [Native Client](https://developer.chrome.com/native-client) project. The fork was made using [git-subtree](https://github.com/git/git/blob/master/contrib/subtree/git-subtree.txt) to include all of Subzero's history. 85 86[llvm-subzero](third_party/llvm-subzero/) contains a minimized set of LLVM dependencies of the Subzero project. 87 88[PowerVR_SDK](third_party/PowerVR_SDK/) contains a subset of the [PowerVR Graphics Native SDK](https://github.com/powervr-graphics/Native_SDK) for running several sample applications. 89 90[googletest](third_party/googletest/) contains the [Google Test](https://github.com/google/googletest) 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. 91 92Documentation 93------------- 94 95See [docs/Index.md](docs/Index.md). 96 97Contact 98------- 99 100Public mailing list: [swiftshader@googlegroups.com](https://groups.google.com/forum/#!forum/swiftshader) 101 102General bug tracker: https://g.co/swiftshaderbugs \ 103Chrome specific bugs: https://bugs.chromium.org/p/swiftshader 104 105License 106------- 107 108The SwiftShader project is licensed under the Apache License Version 2.0. You can find a copy of it in [LICENSE.txt](LICENSE.txt). 109 110Files in the third_party folder are subject to their respective license. 111 112Authors and Contributors 113------------------------ 114 115The legal authors for copyright purposes are listed in [AUTHORS.txt](AUTHORS.txt). 116 117[CONTRIBUTORS.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](https://cla.developers.google.com/clas) and have contributed more than a formatting change, feel free to request to be added. 118 119Disclaimer 120---------- 121 1221. Trademarks are the property of their respective owners. 1232. This is not an official Google product. 124
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