/* ----------------------------------------------------------------------
   LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator 

   Original Version:
   http://lammps.sandia.gov, Sandia National Laboratories
   Steve Plimpton, sjplimp@sandia.gov 

   See the README file in the top-level LAMMPS directory. 

   ----------------------------------------------------------------------- 

   USER-CUDA Package and associated modifications:
   https://sourceforge.net/projects/lammpscuda/ 

   Christian Trott, christian.trott@tu-ilmenau.de
   Lars Winterfeld, lars.winterfeld@tu-ilmenau.de
   Theoretical Physics II, University of Technology Ilmenau, Germany 

   See the README file in the USER-CUDA directory. 

   This software is distributed under the GNU General Public License.
------------------------------------------------------------------------- */

__global__ void initfftdata_kernel(double* in,FFT_FLOAT* out)
{
   out[2*(((blockIdx.x*gridDim.y+blockIdx.y)*blockDim.x)+threadIdx.x)]=in[((blockIdx.x*gridDim.y+blockIdx.y)*blockDim.x)+threadIdx.x];
   out[2*(((blockIdx.x*gridDim.y+blockIdx.y)*blockDim.x)+threadIdx.x)+1]=0;
}


__global__ void permute_kernel(FFT_FLOAT* in,FFT_FLOAT* out)
{
   out[2*(((threadIdx.x/2)*gridDim.x+blockIdx.x)*gridDim.y+blockIdx.y)+threadIdx.x-2*(threadIdx.x/2)]=in[((blockIdx.x*gridDim.y+blockIdx.y)*blockDim.x)+threadIdx.x];
}

__global__ void permute_scale_kernel(FFT_FLOAT* in,FFT_FLOAT* out)
{
   out[2*(((threadIdx.x/2)*gridDim.x+blockIdx.x)*gridDim.y+blockIdx.y)+threadIdx.x-2*(threadIdx.x/2)]=in[((blockIdx.x*gridDim.y+blockIdx.y)*blockDim.x)+threadIdx.x]*gridDim.x*gridDim.y*blockDim.x*0.5;
}

__global__ void permute_part_kernel(FFT_FLOAT* in,FFT_FLOAT* out,int nfast,int nmid,int nslow,int ihi,int ilo,int jhi,int jlo,int khi,int klo)
{
    {out[2*((threadIdx.x/2)*(ihi-ilo+1)*(jhi-jlo+1)+(blockIdx.x)*(jhi-jlo+1)+blockIdx.y-jlo)+threadIdx.x-2*(threadIdx.x/2)]=in[2*(blockIdx.x+ilo)*nmid*nslow+2*(blockIdx.y+jlo)*nmid+threadIdx.x+2*klo];  }
}
