Call C++ Function Pointer From Javascript

Is it possible to pass function pointers from C++ (compiled into Javascript using Emscripten) to directly-written JS? I've found ways of creating function pointers of Javascript fu

Solution 1:

Found the answer at https://stackoverflow.com/a/25584986/1319998. You can use the Runtime.dynCall function:

voidpassToJs(void (*cFunctionPointer)()) {
  EM_ASM_ARGS({
    Module.Runtime.dynCall('v', $0, []);
  }, cFunctionPointer);
}

The 'v' is the signature of a void function that doesn't take any arguments.

Apparently it supports other signatures, such as 'vii', which is a void function that takes 2 integer arguments. The integer arguments would then have to passed in the array which is the 3rd argument of Runtime.dynCall.