/*M///////////////////////////////////////////////////////////////////////////////////////
//
//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
//
//  By downloading, copying, installing or using the software you agree to this license.
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//
//                           License Agreement
//                For Open Source Computer Vision Library
//
// Copyright (C) 2010-2012, Institute Of Software Chinese Academy Of Science, all rights reserved.
// Copyright (C) 2010-2012, Advanced Micro Devices, Inc., all rights reserved.
// Third party copyrights are property of their respective owners.
//
// @Authors
//    Jiang Liyuan, jlyuan001.good@163.com
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
//   * Redistribution's of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
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//     this list of conditions and the following disclaimer in the documentation
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//   * The name of the copyright holders may not be used to endorse or promote products
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//M*/

#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

/************************************** pow **************************************/

__kernel void arithm_pow(__global VT * src, int src_step, int src_offset,
                         __global VT * dst, int dst_step, int dst_offset,
                         int rows, int cols, T p)
{
    int x = get_global_id(0);
    int y = get_global_id(1);

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

        VT src_data = src[src_index];
        VT tmp = src_data > (VT)0 ? (VT)exp(p * log(src_data)) : (src_data == (VT)0 ? (VT)0 : (VT)exp(p * log(fabs(src_data))));

        dst[dst_index] = tmp;
    }
}
