accessing functions from javascript in Unity3d webgl

[Dan Savage]

Unity3d uses emscripten to run unity in javascript for webgl.  I'm trying to access functions that I wrote in unity from javascript but I get errors that it cannot find the functions.

I'm using the documentation examples of communicating found here
https://kripken.github.io/emscripte...l#interacting-with-code-direct-function-calls

I've tried the example of putting int_sqrt  into the code and then using _ underscore for direct call to the function. I also tried the ccall and cwrap.  The functions are not found using either of these methods.

Assertion failed: Cannot call unknown function int_sqrt (perhaps LLVM optimizations or closure removed it?)

The function is there because I can call it using a unity specific SendMessage command that unity included.
Why can't I see it using the underscore or cwrap commands?

[Alon Zakai]

The int_sqrt function also needs to be exported, using the EXPORTED_FUNCTIONS option on the commandline, or the EMSCRIPTEN_KEEPALIVE macro in the source. Otherwise, the compiler removes code it thinks is not needed.

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[Dan Savage]

So in this case unity3d is doing the compilations so I have no control over that. Unity has their own method for calling functions which works so the function must exist somewhere but maybe it's renamed or hidden.  I was hoping there might be a way to interact directly with the function.

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[Alon Zakai]

Can't you add EMSCRIPTEN_KEEPALIVE in the C++ source where you wrote that int_sqrt function? See examples in the link from before.

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[juj j]

Unity wraps on top of the Emscripten mechanisms to interact with C# scripts and JavaScript. See here for instructions: http://docs.unity3d.com/Manual/webgl-interactingwithbrowserscripting.html. Do the methods outlined there work for you?

If you are writing a Unity C/C++ plugin and want to call that from JS side, then you will likely need to use the EMSCRIPTEN_KEEPALIVE method that Alon mentions, if the function is not otherwise pinned down by any other function calls.