public static extern fftwf_plan fftwf_plan_dft_3d(int n0, int n1, int n2, ref fftwf_complex _in, ref fftwf_complex _out, int sign, uint flags);
public static extern fftwf_plan fftwf_plan_many_dft_c2r(int rank, ref int n, int batch, ref fftwf_complex _in, ref int inembed, int istride, int idist, ref float _out, ref int onembed, int ostride, int odist, uint flags);
public static extern void fftwf_execute_dft_c2r(fftwf_plan plan, ref fftwf_complex idata, ref float odata);
public static extern fftwf_plan fftwf_plan_guru_dft_c2r(int rank, ref fftwf_iodim dims, int batch_rank, ref fftwf_iodim batch_dims, ref fftwf_complex _in, ref float _out, uint flags);
public static extern fftwf_plan fftwf_plan_dft_c2r(int rank, ref int n, ref fftwf_complex _in, ref float _out, uint flags);
public static extern fftwf_plan fftwf_plan_dft_c2r_3d(int n0, int n1, int n2, ref fftwf_complex _in, ref float _out, uint flags);
public static extern fftwf_plan fftwf_plan_dft_r2c_2d(int n0, int n1, ref float _in, ref fftwf_complex _out, uint flags);
public static extern fftwf_plan fftwf_plan_dft(int rank, ref int n, ref fftwf_complex _in, ref fftwf_complex _out, int sign, uint flags);