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

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#ifdef DOUBLE_SUPPORT
#ifdef cl_amd_fp64
#pragma OPENCL EXTENSION cl_amd_fp64:enable
#elif defined (cl_khr_fp64)
#pragma OPENCL EXTENSION cl_khr_fp64:enable
#endif
#endif

#define noconvert

__kernel void convertTo(__global const uchar * srcptr, int src_step, int src_offset,
                        __global uchar * dstptr, int dst_step, int dst_offset, int dst_rows, int dst_cols,
                        WT alpha, WT beta, int rowsPerWI)
{
    int x = get_global_id(0);
    int y0 = get_global_id(1) * rowsPerWI;

    if (x < dst_cols)
    {
        int src_index = mad24(y0, src_step, mad24(x, (int)sizeof(srcT), src_offset));
        int dst_index = mad24(y0, dst_step, mad24(x, (int)sizeof(dstT), dst_offset));

        for (int y = y0, y1 = min(dst_rows, y0 + rowsPerWI); y < y1; ++y, src_index += src_step, dst_index += dst_step)
        {
            __global const srcT * src = (__global const srcT *)(srcptr + src_index);
            __global dstT * dst = (__global dstT *)(dstptr + dst_index);

            dst[0] = convertToDT(fma(convertToWT(src[0]), alpha, beta));
        }
    }
}