opencv/modules/imgproc/src/opencl/threshold.cl

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//    Zhang Ying, zhangying913@gmail.com
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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

__kernel void threshold(__global const uchar * srcptr, int src_step, int src_offset,
                        __global uchar * dstptr, int dst_step, int dst_offset, int rows, int cols,
                        T1 thresh, T1 max_val)
{
    int gx = get_global_id(0);
    int gy = get_global_id(1);

    if (gx < cols && gy < rows)
    {
        int src_index = mad24(gy, src_step, mad24(gx, (int)sizeof(T), src_offset));
        int dst_index = mad24(gy, dst_step, mad24(gx, (int)sizeof(T), dst_offset));

        T sdata = *(__global const T *)(srcptr + src_index);
        __global T * dst = (__global T *)(dstptr + dst_index);

#ifdef THRESH_BINARY
        dst[0] = sdata > (T)(thresh) ? (T)(max_val) : (T)(0);
#elif defined THRESH_BINARY_INV
        dst[0] = sdata > (T)(thresh) ? (T)(0) : (T)(max_val);
#elif defined THRESH_TRUNC
        dst[0] = sdata > (T)(thresh) ? (T)(thresh) : sdata;
#elif defined THRESH_TOZERO
        dst[0] = sdata > (T)(thresh) ? sdata : (T)(0);
#elif defined THRESH_TOZERO_INV
        dst[0] = sdata > (T)(thresh) ? (T)(0) : sdata;
#endif
    }
}