extern "C" {
#include "blas.h"
#include "cuda.h"
}

__global__ void axpy_kernel(int N, float ALPHA, float *X, int OFFX, int INCX,  float *Y, int OFFY, int INCY)
{
    int i = (blockIdx.x + blockIdx.y*gridDim.x) * blockDim.x + threadIdx.x;
    if(i < N) Y[OFFY+i*INCY] += ALPHA*X[OFFX+i*INCX];
}

__global__ void scal_kernel(int N, float ALPHA, float *X, int INCX)
{
    int i = (blockIdx.x + blockIdx.y*gridDim.x) * blockDim.x + threadIdx.x;
    if(i < N) X[i*INCX] *= ALPHA;
}

__global__ void mask_kernel(int n,  float *x, float *mask)
{
    int i = (blockIdx.x + blockIdx.y*gridDim.x) * blockDim.x + threadIdx.x;
    if(i < n && mask[i] == 0) x[i] = 0;
}

__global__ void copy_kernel(int N,  float *X, int OFFX, int INCX, float *Y, int OFFY, int INCY)
{
    int i = (blockIdx.x + blockIdx.y*gridDim.x) * blockDim.x + threadIdx.x;
    if(i < N) Y[i*INCY + OFFY] = X[i*INCX + OFFX];
}

extern "C" void axpy_ongpu(int N, float ALPHA, float * X, int INCX, float * Y, int INCY)
{
    axpy_ongpu_offset(N, ALPHA, X, 0, INCX, Y, 0, INCY);
}

extern "C" void axpy_ongpu_offset(int N, float ALPHA, float * X, int OFFX, int INCX, float * Y, int OFFY, int INCY)
{
    axpy_kernel<<<cuda_gridsize(N), BLOCK>>>(N, ALPHA, X, OFFX, INCX, Y, OFFY, INCY);
    check_error(cudaPeekAtLastError());
}

extern "C" void copy_ongpu(int N, float * X, int INCX, float * Y, int INCY)
{
    copy_ongpu_offset(N, X, 0, INCX, Y, 0, INCY);
}

extern "C" void copy_ongpu_offset(int N, float * X, int OFFX, int INCX, float * Y, int OFFY, int INCY)
{
    copy_kernel<<<cuda_gridsize(N), BLOCK>>>(N, X, OFFX, INCX, Y, OFFY, INCY);
    check_error(cudaPeekAtLastError());
}

extern "C" void mask_ongpu(int N, float * X, float * mask)
{
    mask_kernel<<<cuda_gridsize(N), BLOCK>>>(N, X, mask);
    check_error(cudaPeekAtLastError());
}

extern "C" void scal_ongpu(int N, float ALPHA, float * X, int INCX)
{
    scal_kernel<<<cuda_gridsize(N), BLOCK>>>(N, ALPHA, X, INCX);
    check_error(cudaPeekAtLastError());
}