/*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.
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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
//    Shengen Yan, yanshengen@gmail.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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//   * 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 GpuMaterials provided with the distribution.
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//   * The name of the copyright holders may not be used to endorse or promote products
//     derived from this software without specific prior written permission.
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// This software is provided by the copyright holders and contributors as is and
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// 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
// and on any theory of liability, whether in contract, strict liability,
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//M*/

/**************************************PUBLICFUNC*************************************/
#if defined (DOUBLE_SUPPORT)
#pragma OPENCL EXTENSION cl_khr_fp64:enable
#define RES_TYPE double4
#define CONVERT_RES_TYPE convert_double4
#else
#define RES_TYPE float4
#define CONVERT_RES_TYPE convert_float4
#endif

#if defined (DEPTH_0)
#define TYPE uchar
#define VEC_TYPE uchar4
#define VEC_TYPE_LOC int4
#define CONVERT_TYPE convert_uchar4
#define CONDITION_FUNC(a,b,c) (convert_int4(a) ? b : c)
#define MIN_VAL 0
#define MAX_VAL 255
#endif
#if defined (DEPTH_1)
#define TYPE char
#define VEC_TYPE char4
#define VEC_TYPE_LOC int4
#define CONVERT_TYPE convert_char4
#define CONDITION_FUNC(a,b,c) (convert_int4(a) ? b : c)
#define MIN_VAL -128
#define MAX_VAL 127
#endif
#if defined (DEPTH_2)
#define TYPE ushort
#define VEC_TYPE ushort4
#define VEC_TYPE_LOC int4
#define CONVERT_TYPE convert_ushort4
#define CONDITION_FUNC(a,b,c) (convert_int4(a) ? b : c)
#define MIN_VAL 0
#define MAX_VAL 65535
#endif
#if defined (DEPTH_3)
#define TYPE short
#define VEC_TYPE short4
#define VEC_TYPE_LOC int4
#define CONVERT_TYPE convert_short4
#define CONDITION_FUNC(a,b,c) (convert_int4(a) ? b : c)
#define MIN_VAL -32768
#define MAX_VAL 32767
#endif
#if defined (DEPTH_4)
#define TYPE int
#define VEC_TYPE int4
#define VEC_TYPE_LOC int4
#define CONVERT_TYPE convert_int4
#define CONDITION_FUNC(a,b,c) ((a) ? b : c)
#define MIN_VAL INT_MIN
#define MAX_VAL INT_MAX
#endif
#if defined (DEPTH_5)
#define TYPE float
#define VEC_TYPE float4
#define VEC_TYPE_LOC float4
#define CONVERT_TYPE convert_float4
#define CONDITION_FUNC(a,b,c) ((a) ? b : c)
#define MIN_VAL (-FLT_MAX)
#define MAX_VAL FLT_MAX
#endif
#if defined (DEPTH_6)
#define TYPE double
#define VEC_TYPE double4
#define VEC_TYPE_LOC double4
#define CONVERT_TYPE convert_double4
#define CONDITION_FUNC(a,b,c) ((a) ? b : c)
#define MIN_VAL (-DBL_MAX)
#define MAX_VAL DBL_MAX
#endif

#if defined (REPEAT_E0)
#define repeat_e(a) a=a;
#endif
#if defined (REPEAT_E1)
#define repeat_e(a) a.s3 = a.s2;
#endif
#if defined (REPEAT_E2)
#define repeat_e(a) a.s3 = a.s1;a.s2 = a.s1;
#endif
#if defined (REPEAT_E3)
#define repeat_e(a) a.s3 = a.s0;a.s2 = a.s0;a.s1 = a.s0;
#endif

#if defined (REPEAT_E0)
#define repeat_me(a) a = a;
#endif
#if defined (REPEAT_E1)
#define repeat_me(a) a.s3 = 0;
#endif
#if defined (REPEAT_E2)
#define repeat_me(a) a.s3 = 0;a.s2 = 0;
#endif
#if defined (REPEAT_E3)
#define repeat_me(a) a.s3 = 0;a.s2 = 0;a.s1 = 0;
#endif

/**************************************Array minMaxLoc mask**************************************/
__kernel void arithm_op_minMaxLoc_mask (int cols,int invalid_cols,int offset,int elemnum,int groupnum,__global TYPE *src,
                                        int minvalid_cols,int moffset,__global uchar *mask,__global RES_TYPE  *dst)
{
   unsigned int lid = get_local_id(0);
   unsigned int gid = get_group_id(0);
   unsigned int  id = get_global_id(0);
   unsigned int idx = id + (id / cols) * invalid_cols;
   unsigned int midx = id + (id / cols) * minvalid_cols;
   __local VEC_TYPE lm_max[128],lm_min[128];
   VEC_TYPE minval,maxval,temp,m_temp;
   __local VEC_TYPE_LOC lm_maxloc[128],lm_minloc[128];
   VEC_TYPE_LOC minloc,maxloc,temploc,negative = -1,one = 1,zero = 0;
   if(id < elemnum)
   {
       temp = vload4(idx, &src[offset]);
       m_temp = CONVERT_TYPE(vload4(midx,&mask[moffset]));
       int idx_c = (idx << 2) + offset;
       temploc = (VEC_TYPE_LOC)(idx_c,idx_c+1,idx_c+2,idx_c+3);
       if(id % cols == cols - 1)
       {
           repeat_me(m_temp);
           repeat_e(temploc);
       }
       minval = m_temp != (VEC_TYPE)0 ? temp : (VEC_TYPE)MAX_VAL;
       maxval = m_temp != (VEC_TYPE)0 ? temp : (VEC_TYPE)MIN_VAL;
       minloc = CONDITION_FUNC(m_temp != (VEC_TYPE)0, temploc , negative);
       maxloc = minloc;
   }
   else
   {
       minval = MAX_VAL;
       maxval = MIN_VAL;
       minloc = negative;
       maxloc = negative;
   }
   for(id=id + (groupnum << 8); id < elemnum;id = id + (groupnum << 8))
   {
       idx = id + (id / cols) * invalid_cols;
       midx = id + (id / cols) * minvalid_cols;
       temp = vload4(idx, &src[offset]);
       m_temp = CONVERT_TYPE(vload4(midx,&mask[moffset]));
       int idx_c = (idx << 2) + offset;
       temploc = (VEC_TYPE_LOC)(idx_c,idx_c+1,idx_c+2,idx_c+3);
       if(id % cols == cols - 1)
       {
           repeat_me(m_temp);
           repeat_e(temploc);
       }
       minval = min(minval,m_temp != (VEC_TYPE)0 ? temp : minval);
       maxval = max(maxval,m_temp != (VEC_TYPE)0 ? temp : maxval);

       minloc = CONDITION_FUNC((minval == temp) && (m_temp != (VEC_TYPE)0), temploc , minloc);
       maxloc = CONDITION_FUNC((maxval == temp) && (m_temp != (VEC_TYPE)0), temploc , maxloc);
   }
   if(lid > 127)
   {
       lm_min[lid - 128] = minval;
       lm_max[lid - 128] = maxval;
       lm_minloc[lid - 128] = minloc;
       lm_maxloc[lid - 128] = maxloc;
   }
   barrier(CLK_LOCAL_MEM_FENCE);
   if(lid < 128)
   {
       lm_min[lid] = min(minval,lm_min[lid]);
       lm_max[lid] = max(maxval,lm_max[lid]);
       VEC_TYPE con_min = CONVERT_TYPE(minloc != negative ? one : zero);
       VEC_TYPE con_max = CONVERT_TYPE(maxloc != negative ? one : zero);
       lm_minloc[lid] = CONDITION_FUNC((lm_min[lid] == minval) && (con_min != (VEC_TYPE)0), minloc , lm_minloc[lid]);
       lm_maxloc[lid] = CONDITION_FUNC((lm_max[lid] == maxval) && (con_max != (VEC_TYPE)0), maxloc , lm_maxloc[lid]);
   }
   barrier(CLK_LOCAL_MEM_FENCE);
   for(int lsize = 64; lsize > 0; lsize >>= 1)
   {
       if(lid < lsize)
       {
           int lid2 = lsize + lid;
           lm_min[lid] = min(lm_min[lid] , lm_min[lid2]);
           lm_max[lid] = max(lm_max[lid] , lm_max[lid2]);
           VEC_TYPE con_min = CONVERT_TYPE(lm_minloc[lid2] != negative ? one : zero);
           VEC_TYPE con_max = CONVERT_TYPE(lm_maxloc[lid2] != negative ? one : zero);
           lm_minloc[lid] =
              CONDITION_FUNC((lm_min[lid] == lm_min[lid2]) && (con_min != (VEC_TYPE)0), lm_minloc[lid2] , lm_minloc[lid]);
           lm_maxloc[lid] =
              CONDITION_FUNC((lm_max[lid] == lm_max[lid2]) && (con_max != (VEC_TYPE)0), lm_maxloc[lid2] , lm_maxloc[lid]);
       }
       barrier(CLK_LOCAL_MEM_FENCE);
   }
   if( lid == 0)
   {
       dst[gid] = CONVERT_RES_TYPE(lm_min[0]);
       dst[gid + groupnum] = CONVERT_RES_TYPE(lm_max[0]);
       dst[gid + 2 * groupnum] = CONVERT_RES_TYPE(lm_minloc[0]);
       dst[gid + 3 * groupnum] = CONVERT_RES_TYPE(lm_maxloc[0]);
   }
}