Function xDoublePerlinInit 

pub unsafe extern "C" fn xDoublePerlinInit(
    noise: *mut DoublePerlinNoise,
    xr: *mut Xoroshiro,
    octaves: *mut PerlinNoise,
    amplitudes: *const f64,
    omin: c_int,
    len: c_int,
    nmax: c_int,
) -> c_int