// C++ Code
  Handle<Value> gl_glGenTextures(const Arguments& args) {
    HandleScope scope;
    GLsizei _n = (GLsizei)args[0]->Int32Value();
    GLuint _textures = -1;
    glGenTextures(_n, &_textures);

    std::cout << "This: " << _textures << std::endl;

    return scope.Close(Number::New(_textures));
    // changing has no effect
    //return scope.Close(Integer::New(_textures));
  }


// Javascript code
      console.log("What: " + gl.glGenTextures(1));


// Output
This: 1
What: undefined