1DS C++ SDK bindings for Unity C# layer

[maxgolov]

C# projection layer - old work item #4

It took us a few years to realize that we finally need 1DS C++ SDK bindings for Unity C# code in Microsoft Mesh.

Implementation should work well under the following environments:

• Unity WebAssembly IL2CPP (Unity transpiles C# to C++ to WebAssembly)
• Unity Editor with Mono 2.x
• Unity based on NETStandard 2.x+

List of changes:

• mod mat.h to pack structure. This enables predictable C API interop between C# layer and C.
• example that shows how to P/Invoke from .NET to shared 1DS library.

Unity wrapper will be maintained elsewhere outside of this repo.

[maxgolov]

While this works for .NET Standard 2.x , unfortunately Newtonsoft works better in Unity. I'm not changing it here since this will be taken care of elsewhere, in the implementation of Unity Package outside of 1DS repository.

[maxgolov]

Need to define it.

[maxgolov]

I'll change the wording of incomplete to provides the same level of functionality as C API, i.e. some features are accessible only from C++ layer. This still allows the native code initializer to use SetContext(...) efficiently, to populate common known fields, like session id, etc.. C# layer becomes guest to host initialized by native library.

[lalitb]

In case the code under wrappers/netcore is to demonstrate calling capi from C# code using P/Invoke, should we move this code under example directory. The capi related code changes look good in general, though I am not expert on P/Invoke part of example code.

[maxgolov]

should we move this code under example directory?

I can split it into two parts:

• EventNativeAPI.cs - belongs in wrappers dir. This is nearly identical to what we use in the product.
• Program.cs - belongs in examples dir.

[lalitb]

I can split it into two parts:

Yes, that will make sense. Thanks.

[maxgolov]

Sorry for delay. We integrated it on our end, so I put it on a back-burner.
I'll get back to this.