[RFC] WinAdapter: Export helper functions to interact with shimmed types #3265
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❌ Build DirectXShaderCompiler 1.0.3888 failed (commit 94e7cdcc99 by @MarijnS95) |
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The implementation of these support types completely depends on DXC. As such applications using libdxcompiler.so have to guess and/or look at the source code to understand how they are implemented (eg prefix size for BSTR), and assume this is not going to change. Applications using these newly exported symbols can do it "the right way" as if they are on Windows.
Some functions return lists allocated with CoTaskMemAlloc. Applications using libdxcompiler.so currently have to look into the code to understand that these should be deallocated with free() instead of delete[]. Export the CoTaskMemFree function so that there is no guesswork involved anymore: the application can now call this function and always free it in the right way.
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Still an RFC as per #3250 (comment), not sure if we actually want this - probably not worth the hassle as we're following the implementation of |
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For #3250 (comment)
WinAdapter shims some types and constructs that returned to applications interacting with
libdxcompiler.so. Currently these applications have to "guess" or look into the code to understand how to work with these without provoking incorrect or unexpected behaviour. Even though they are unlikely to change, exporting these functions allow applications to work with Windows APIs "as normal" on Linux, without having to define fallback paths with heavily implementation dependent code.For example, my usecase of DXC currently has to define these monstrosities:
https://github.com/Traverse-Research/hassle-rs/blob/5cfd0f545e27c54f592e54f73214d129ebfab1a8/src/os.rs#L26-L54