opencv/modules/core/src/opencl/transpose.cl

/*M///////////////////////////////////////////////////////////////////////////////////////
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// @Authors
//    Jia Haipeng, jiahaipeng95@gmail.com
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#if cn != 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

#ifndef INPLACE

#define LDS_STEP      (TILE_DIM + 1)

__kernel void transpose(__global const uchar * srcptr, int src_step, int src_offset, int src_rows, int src_cols,
                        __global uchar * dstptr, int dst_step, int dst_offset)
{
    int gp_x = get_group_id(0),   gp_y = get_group_id(1);
    int gs_x = get_num_groups(0), gs_y = get_num_groups(1);

    int groupId_x, groupId_y;

    if (src_rows == src_cols)
    {
        groupId_y = gp_x;
        groupId_x = (gp_x + gp_y) % gs_x;
    }
    else
    {
        int bid = mad24(gs_x, gp_y, gp_x);
        groupId_y =  bid % gs_y;
        groupId_x = ((bid / gs_y) + groupId_y) % gs_x;
    }

    int lx = get_local_id(0);
    int ly = get_local_id(1);

    int x = mad24(groupId_x, TILE_DIM, lx);
    int y = mad24(groupId_y, TILE_DIM, ly);

    int x_index = mad24(groupId_y, TILE_DIM, lx);
    int y_index = mad24(groupId_x, TILE_DIM, ly);

    __local T tile[TILE_DIM * LDS_STEP];

    if (x < src_cols && y < src_rows)
    {
        int index_src = mad24(y, src_step, mad24(x, TSIZE, src_offset));

        #pragma unroll
        for (int i = 0; i < TILE_DIM; i += BLOCK_ROWS)
            if (y + i < src_rows)
            {
                tile[mad24(ly + i, LDS_STEP, lx)] = loadpix(srcptr + index_src);
                index_src = mad24(BLOCK_ROWS, src_step, index_src);
            }
    }
    barrier(CLK_LOCAL_MEM_FENCE);

    if (x_index < src_rows && y_index < src_cols)
    {
        int index_dst = mad24(y_index, dst_step, mad24(x_index, TSIZE, dst_offset));

        #pragma unroll
        for (int i = 0; i < TILE_DIM; i += BLOCK_ROWS)
            if ((y_index + i) < src_cols)
            {
                storepix(tile[mad24(lx, LDS_STEP, ly + i)], dstptr + index_dst);
                index_dst = mad24(BLOCK_ROWS, dst_step, index_dst);
            }
    }
}

#else

__kernel void transpose_inplace(__global uchar * srcptr, int src_step, int src_offset, int src_rows)
{
    int x = get_global_id(0);
    int y = get_global_id(1) * rowsPerWI;

    if (x < y + rowsPerWI)
    {
        int src_index = mad24(y, src_step, mad24(x, TSIZE, src_offset));
        int dst_index = mad24(x, src_step, mad24(y, TSIZE, src_offset));
        T tmp;

        #pragma unroll
        for (int i = 0; i < rowsPerWI; ++i, ++y, src_index += src_step, dst_index += TSIZE)
            if (y < src_rows && x < y)
            {
                __global uchar * src = srcptr + src_index;
                __global uchar * dst = srcptr + dst_index;

                tmp = loadpix(dst);
                storepix(loadpix(src), dst);
                storepix(tmp, src);
            }
    }
}

#endif // INPLACE