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

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//                For Open Source Computer Vision Library
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// Copyright (C) 2010-2012, Institute Of Software Chinese Academy Of Science, all rights reserved.
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// @Authors
//    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

#ifdef VECTORIZED

__kernel void threshold(__global const T * restrict src, int src_offset, int src_step,
                        __global T * dst, int dst_offset, int dst_step,
                        T thresh, T max_val, int max_index, int rows, int cols)
{
    int gx = get_global_id(0);
    int gy = get_global_id(1);

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

#ifdef SRC_ALIGNED
        VT sdata = *((__global VT *)(src + src_index));
#else
        VT sdata = VLOADN(0, src + src_index);
#endif
        VT vthresh = (VT)(thresh);

#ifdef THRESH_BINARY
        VT vecValue = sdata > vthresh ? max_val : (VT)(0);
#elif defined THRESH_BINARY_INV
        VT vecValue = sdata > vthresh ? (VT)(0) : max_val;
#elif defined THRESH_TRUNC
        VT vecValue = sdata > vthresh ? thresh : sdata;
#elif defined THRESH_TOZERO
        VT vecValue = sdata > vthresh ? sdata : (VT)(0);
#elif defined THRESH_TOZERO_INV
        VT vecValue = sdata > vthresh ? (VT)(0) : sdata;
#endif

        if (gx + VECSIZE <= max_index)
#ifdef DST_ALIGNED
            *(__global VT*)(dst + dst_index) = vecValue;
#else
            VSTOREN(vecValue, 0, dst + dst_index);
#endif
        else
        {
            __attribute__(( aligned(sizeof(VT)) )) T array[VECSIZE];
            *((VT*)array) = vecValue;
            #pragma unroll
            for (int i = 0; i < VECSIZE; ++i)
                if (gx + i < max_index)
                    dst[dst_index + i] = array[i];
        }
    }
}

#else

__kernel void threshold(__global const T * restrict src, int src_offset, int src_step,
                        __global T * dst, int dst_offset, int dst_step,
                        T thresh, T max_val, int rows, int cols)
{
    int gx = get_global_id(0);
    int gy = get_global_id(1);

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

        T sdata = src[src_index];

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

#endif