SwiftShader is an open-source, high-performance CPU-based graphics renderer developed by Google. It allows systems without a compatible GPU to run 3D graphics by performing calculations on the CPU instead. Project Overview

Final Recommendation

Avoid this download.

Windows Binaries: For pre-compiled versions that work with legacy Direct3D (d3d8.dll, d3d9.dll) or Vulkan, reliable community-maintained builds are available on GitHub via pal1000.

Conclusion

Official Source: SwiftShader is an open-source project hosted by Google. You can find the source code and documentation on the Google Git repository.