[Pharo-users] FFI return by reference

Hi again, Does anyone know what is the state of return by reference in FFI? Example: glGetAttribute: attr into: value <primitive: #primitiveNativeCall module: #NativeBoostPlugin error: errorCode> ^ self nbCall: #( int SDL_GL_GetAttribute(SDL_GLattr attr, int *value) ) On my image (50666) it does nothing on value yet (if nil, remains nil, if SmallInteger 0, remains 0). (SDL2 glGetAttribute: 6 into: value) should return 16. I've seen NBOpenGL put "out" before value in method header, should it matter? (does not make it work though) Last but not least, should we attach '*' to the type or variable for FFI to understand it is a pointer? Cheers, Thibault Raffaillac