.jslib, What does `__sig` anotation mean?

Unity Engine
1

I’m the source of WebCamTexture in WebGL.
Unity\Hub\Editor[ver]\Editor\Data\PlaybackEngines\WebGLSupport\BuildTools\lib\WebCam.js
I looked at the file,

xxx__proxy:'sync',
xxx__sig:'ii',
xxx: function (val) {
  return val;
}

I found the emscripten documentation for the __proxy annotation immediately and understood it, but I still can’t understand the __sig annotation because I couldn’t find the documentation.
From the value, I know it’s the signature of the function, but what’s the difference with and without this annotation?

2

Sig means function signature. The first character represents the function return value, and the subsequent characters denote the function arguments. E.g. ‘ii’ is a function that returns an integer, and takes a single integer value as input. ‘v’ is void, ‘f’ is float and ‘d’ is double.

Neither the __proxy and __sig fields are currently used, because Unity does not yet support building in Emscripten PROXY_TO_PTHREAD=1 mode. However we have added those to be future compatible if that mode becomes current for Unity.

2 Likes
3

Thanx a lot!
I understood.