/*M///////////////////////////////////////////////////////////////////////////////////////
//
//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
//
//  By downloading, copying, installing or using the software you agree to this license.
//  If you do not agree to this license, do not download, install,
//  copy or use the software.
//
//
//                           License Agreement
//                For Open Source Computer Vision Library
//
// Copyright (C) 2017, Intel Corporation, all rights reserved.
// Copyright (c) 2016-2017 Fabian David Tschopp, all rights reserved.
// Third party copyrights are property of their respective owners.
//
// 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.
//
//   * Redistribution's in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//
//   * The name of the copyright holders may not be used to endorse or promote products
//     derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors "as is" and
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// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the Intel Corporation or contributors be liable for any direct,
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// loss of use, data, or profits; or business interruption) however caused
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//M*/

#define Dtype float
#define Dtype4 float4
#define Dtype8 float8

#if NUM == 8
    #define load(src, index) vload8(0, src + index)
    #define store(vec, dst, index) vstore8(vec, 0, dst + index)
    #define vec_type Dtype8
    #define SLICE slice8
#elif NUM == 4
    #define load(src, index) vload4(0, src + index)
    #define store(vec, dst, index) vstore4(vec, 0, dst + index)
    #define vec_type Dtype4
    #define SLICE slice4
#elif NUM == 1
    #define load(src, index) src[index]
    #define store(vec, dst, index) dst[index] = vec
    #define vec_type Dtype
    #define SLICE slice1
#endif

__kernel void SLICE(__global const Dtype* src,
                    const int src_plane_size,
                    const int src_cols,
                    const int channels,
                    const int dst_plane_size,
                    const int dst_cols,
                    const int row_offset,
                    const int col_offset,
                    __global Dtype* dst)
{
    int x = get_global_id(0);
    int y = get_global_id(1) * NUM;

    if ((x >= channels) || (y >= dst_plane_size))
        return;

    int row = y / dst_cols + row_offset;
    int col = y % dst_cols + col_offset;

    int src_index = x * src_plane_size + row * src_cols + col;
    int dst_index = x * dst_plane_size + y;
    vec_type val = load(src, src_index);
    store(val, dst, dst_index);
}