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OpenShadingLang reviews and mentions
Open Shading Language – Advanced shading language for production GI renderers
3 projects | news.ycombinator.com | 22 Aug 2021
The language is separate from its implementations.
But as far as the ASF code base: there seems to be CUDA code in here: https://github.com/AcademySoftwareFoundation/OpenShadingLang... - and also using LLVM for x86 doesn't preclude targeting GPUs, either with LLVM or without.