/*M///////////////////////////////////////////////////////////////////////////////////////
//
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//
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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:
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//   * 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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//     derived from this software without specific prior written permission.
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//M*/

#if defined (__ATI__)
#pragma OPENCL EXTENSION cl_amd_fp64:enable
#elif defined (__NVIDIA__)
#pragma OPENCL EXTENSION cl_khr_fp64:enable
#endif
/************************************** convolve **************************************/
__kernel void convolve_D5 (__global float *src, __global float *temp1, __global float *dst,
                                  int rows, int cols, int src_step, int dst_step,int k_step, int kWidth, int kHeight)
{
    __local float smem[16 + 2 * 8][16 + 2 * 8];

    int x = get_local_id(0);
    int y = get_local_id(1);
    int gx = get_global_id(0);
    int gy = get_global_id(1);

            // x | x 0 | 0
            // -----------
            // x | x 0 | 0
            // 0 | 0 0 | 0
            // -----------
            // 0 | 0 0 | 0
    smem[y][x] = src[min(max(gy - 8, 0), rows - 1)*(src_step >> 2) + min(max(gx - 8, 0), cols - 1)];

            // 0 | 0 x | x
            // -----------
            // 0 | 0 x | x
            // 0 | 0 0 | 0
            // -----------
            // 0 | 0 0 | 0
    smem[y][x + 16] = src[min(max(gy - 8, 0), rows - 1)*(src_step >> 2) + min(gx + 8, cols - 1)];

            // 0 | 0 0 | 0
            // -----------
            // 0 | 0 0 | 0
            // x | x 0 | 0
            // -----------
            // x | x 0 | 0
    smem[y + 16][x] = src[min(gy + 8, rows - 1)*(src_step >> 2) + min(max(gx - 8, 0), cols - 1)];

            // 0 | 0 0 | 0
            // -----------
            // 0 | 0 0 | 0
            // 0 | 0 x | x
            // -----------
            // 0 | 0 x | x
    smem[y + 16][x + 16] = src[min(gy + 8, rows - 1)*(src_step >> 2) + min(gx + 8, cols - 1)];

    barrier(CLK_LOCAL_MEM_FENCE);

    if (gx < cols && gy < rows)
    {
       float res = 0;

        for (int i = 0; i < kHeight; ++i)
        {
            for (int j = 0; j < kWidth; ++j)
            {
                res += smem[y + 8 - kHeight / 2 + i][x + 8 - kWidth / 2 + j] * temp1[i * (k_step>>2) + j];
            }
        }
        dst[gy*(dst_step >> 2)+gx] = res;
   }
}


