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//                           License Agreement
//                For Open Source Computer Vision Library
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#if kercn != 3
#define loadpix(addr) *(__global const T *)(addr)
#define storepix(val, addr)  *(__global T *)(addr) = val
#define TSIZE (int)sizeof(T)
#else
#define loadpix(addr) vload3(0, (__global const T1 *)(addr))
#define storepix(val, addr) vstore3(val, 0, (__global T1 *)(addr))
#define TSIZE ((int)sizeof(T1)*3)
#endif

__kernel void arithm_flip_rows(__global const uchar * srcptr, int src_step, int src_offset,
                               __global uchar * dstptr, int dst_step, int dst_offset,
                               int rows, int cols, int thread_rows, int thread_cols)
{
    int x = get_global_id(0);
    int y0 = get_global_id(1) * PIX_PER_WI_Y;

    if (x < cols)
    {
        int src_index0 = mad24(y0, src_step, mad24(x, TSIZE, src_offset));
        int src_index1 = mad24(rows - y0 - 1, src_step, mad24(x, TSIZE, src_offset));
        int dst_index0 = mad24(y0, dst_step, mad24(x, TSIZE, dst_offset));
        int dst_index1 = mad24(rows - y0 - 1, dst_step, mad24(x, TSIZE, dst_offset));

        #pragma unroll
        for (int y = y0, y1 = min(thread_rows, y0 + PIX_PER_WI_Y); y < y1; ++y)
        {
            T src0 = loadpix(srcptr + src_index0);
            T src1 = loadpix(srcptr + src_index1);

            storepix(src1, dstptr + dst_index0);
            storepix(src0, dstptr + dst_index1);

            src_index0 += src_step;
            src_index1 -= src_step;
            dst_index0 += dst_step;
            dst_index1 -= dst_step;
        }
    }
}

__kernel void arithm_flip_rows_cols(__global const uchar * srcptr, int src_step, int src_offset,
                                    __global uchar * dstptr, int dst_step, int dst_offset,
                                    int rows, int cols, int thread_rows, int thread_cols)
{
    int x = get_global_id(0);
    int y0 = get_global_id(1)*PIX_PER_WI_Y;

    if (x < cols)
    {
        int src_index0 = mad24(y0, src_step, mad24(x, TSIZE, src_offset));
        int src_index1 = mad24(rows - y0 - 1, src_step, mad24(cols - x - 1, TSIZE, src_offset));
        int dst_index0 = mad24(y0, dst_step, mad24(x, TSIZE, dst_offset));
        int dst_index1 = mad24(rows - y0 - 1, dst_step, mad24(cols - x - 1, TSIZE, dst_offset));

        #pragma unroll
        for (int y = y0, y1 = min(thread_rows, y0 + PIX_PER_WI_Y); y < y1; ++y)
        {
            T src0 = loadpix(srcptr + src_index0);
            T src1 = loadpix(srcptr + src_index1);

#if kercn == 2
#if cn == 1
            src0 = src0.s10;
            src1 = src1.s10;
#endif
#elif kercn == 4
#if cn == 1
            src0 = src0.s3210;
            src1 = src1.s3210;
#elif cn == 2
            src0 = src0.s2301;
            src1 = src1.s2301;
#endif
#endif

            storepix(src1, dstptr + dst_index0);
            storepix(src0, dstptr + dst_index1);

            src_index0 += src_step;
            src_index1 -= src_step;
            dst_index0 += dst_step;
            dst_index1 -= dst_step;
        }
    }
}

__kernel void arithm_flip_cols(__global const uchar * srcptr, int src_step, int src_offset,
                               __global uchar * dstptr, int dst_step, int dst_offset,
                               int rows, int cols, int thread_rows, int thread_cols)
{
    int x = get_global_id(0);
    int y0 = get_global_id(1)*PIX_PER_WI_Y;

    if (x < thread_cols)
    {
        int src_index0 = mad24(y0, src_step, mad24(x, TSIZE, src_offset));
        int src_index1 = mad24(y0, src_step, mad24(cols - x - 1, TSIZE, src_offset));
        int dst_index0 = mad24(y0, dst_step, mad24(x, TSIZE, dst_offset));
        int dst_index1 = mad24(y0, dst_step, mad24(cols - x - 1, TSIZE, dst_offset));

        #pragma unroll
        for (int y = y0, y1 = min(rows, y0 + PIX_PER_WI_Y); y < y1; ++y)
        {
            T src0 = loadpix(srcptr + src_index0);
            T src1 = loadpix(srcptr + src_index1);

#if kercn == 2
#if cn == 1
            src0 = src0.s10;
            src1 = src1.s10;
#endif
#elif kercn == 4
#if cn == 1
            src0 = src0.s3210;
            src1 = src1.s3210;
#elif cn == 2
            src0 = src0.s2301;
            src1 = src1.s2301;
#endif
#endif

            storepix(src1, dstptr + dst_index0);
            storepix(src0, dstptr + dst_index1);

            src_index0 += src_step;
            src_index1 += src_step;
            dst_index0 += dst_step;
            dst_index1 += dst_step;
        }
    }
}
