/*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) 2013, OpenCV Foundation, 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
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the OpenCV Foundation or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
// the use of this software, even if advised of the possibility of such damage.
//
//M*/

#include "precomp.hpp"
#include <list>
#include <map>
#include <string>
#include <sstream>
#include <iostream> // std::cerr

#define CV_OPENCL_ALWAYS_SHOW_BUILD_LOG 0

#include "opencv2/core/bufferpool.hpp"
#ifndef LOG_BUFFER_POOL
# if 0
#   define LOG_BUFFER_POOL printf
# else
#   define LOG_BUFFER_POOL(...)
# endif
#endif


// TODO Move to some common place
static bool getBoolParameter(const char* name, bool defaultValue)
{
    const char* envValue = getenv(name);
    if (envValue == NULL)
    {
        return defaultValue;
    }
    cv::String value = envValue;
    if (value == "1" || value == "True" || value == "true" || value == "TRUE")
    {
        return true;
    }
    if (value == "0" || value == "False" || value == "false" || value == "FALSE")
    {
        return false;
    }
    CV_ErrorNoReturn(cv::Error::StsBadArg, cv::format("Invalid value for %s parameter: %s", name, value.c_str()));
}


// TODO Move to some common place
static size_t getConfigurationParameterForSize(const char* name, size_t defaultValue)
{
#ifdef HAVE_WINRT
    const char* envValue = NULL;
#else
    const char* envValue = getenv(name);
#endif
    if (envValue == NULL)
    {
        return defaultValue;
    }
    cv::String value = envValue;
    size_t pos = 0;
    for (; pos < value.size(); pos++)
    {
        if (!isdigit(value[pos]))
            break;
    }
    cv::String valueStr = value.substr(0, pos);
    cv::String suffixStr = value.substr(pos, value.length() - pos);
    int v = atoi(valueStr.c_str());
    if (suffixStr.length() == 0)
        return v;
    else if (suffixStr == "MB" || suffixStr == "Mb" || suffixStr == "mb")
        return v * 1024 * 1024;
    else if (suffixStr == "KB" || suffixStr == "Kb" || suffixStr == "kb")
        return v * 1024;
    CV_ErrorNoReturn(cv::Error::StsBadArg, cv::format("Invalid value for %s parameter: %s", name, value.c_str()));
}

#include "opencv2/core/opencl/runtime/opencl_clamdblas.hpp"
#include "opencv2/core/opencl/runtime/opencl_clamdfft.hpp"

#ifdef HAVE_OPENCL
#include "opencv2/core/opencl/runtime/opencl_core.hpp"
#else
// TODO FIXIT: This file can't be build without OPENCL

/*
  Part of the file is an extract from the standard OpenCL headers from Khronos site.
  Below is the original copyright.
*/

/*******************************************************************************
 * Copyright (c) 2008 - 2012 The Khronos Group Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and/or associated documentation files (the
 * "Materials"), to deal in the Materials without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Materials, and to
 * permit persons to whom the Materials are furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Materials.
 *
 * THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
 ******************************************************************************/

#if 0 //defined __APPLE__
#define HAVE_OPENCL 1
#else
#undef HAVE_OPENCL
#endif

#define OPENCV_CL_NOT_IMPLEMENTED -1000

#ifdef HAVE_OPENCL

#if defined __APPLE__
#include <OpenCL/opencl.h>
#else
#include <CL/opencl.h>
#endif

static const bool g_haveOpenCL = true;

#else

extern "C" {

struct _cl_platform_id { int dummy; };
struct _cl_device_id { int dummy; };
struct _cl_context { int dummy; };
struct _cl_command_queue { int dummy; };
struct _cl_mem { int dummy; };
struct _cl_program { int dummy; };
struct _cl_kernel { int dummy; };
struct _cl_event { int dummy; };
struct _cl_sampler { int dummy; };

typedef struct _cl_platform_id *    cl_platform_id;
typedef struct _cl_device_id *      cl_device_id;
typedef struct _cl_context *        cl_context;
typedef struct _cl_command_queue *  cl_command_queue;
typedef struct _cl_mem *            cl_mem;
typedef struct _cl_program *        cl_program;
typedef struct _cl_kernel *         cl_kernel;
typedef struct _cl_event *          cl_event;
typedef struct _cl_sampler *        cl_sampler;

typedef int cl_int;
typedef unsigned cl_uint;
#if defined (_WIN32) && defined(_MSC_VER)
    typedef __int64 cl_long;
    typedef unsigned __int64 cl_ulong;
#else
    typedef long cl_long;
    typedef unsigned long cl_ulong;
#endif

typedef cl_uint             cl_bool; /* WARNING!  Unlike cl_ types in cl_platform.h, cl_bool is not guaranteed to be the same size as the bool in kernels. */
typedef cl_ulong            cl_bitfield;
typedef cl_bitfield         cl_device_type;
typedef cl_uint             cl_platform_info;
typedef cl_uint             cl_device_info;
typedef cl_bitfield         cl_device_fp_config;
typedef cl_uint             cl_device_mem_cache_type;
typedef cl_uint             cl_device_local_mem_type;
typedef cl_bitfield         cl_device_exec_capabilities;
typedef cl_bitfield         cl_command_queue_properties;
typedef intptr_t            cl_device_partition_property;
typedef cl_bitfield         cl_device_affinity_domain;

typedef intptr_t            cl_context_properties;
typedef cl_uint             cl_context_info;
typedef cl_uint             cl_command_queue_info;
typedef cl_uint             cl_channel_order;
typedef cl_uint             cl_channel_type;
typedef cl_bitfield         cl_mem_flags;
typedef cl_uint             cl_mem_object_type;
typedef cl_uint             cl_mem_info;
typedef cl_bitfield         cl_mem_migration_flags;
typedef cl_uint             cl_image_info;
typedef cl_uint             cl_buffer_create_type;
typedef cl_uint             cl_addressing_mode;
typedef cl_uint             cl_filter_mode;
typedef cl_uint             cl_sampler_info;
typedef cl_bitfield         cl_map_flags;
typedef cl_uint             cl_program_info;
typedef cl_uint             cl_program_build_info;
typedef cl_uint             cl_program_binary_type;
typedef cl_int              cl_build_status;
typedef cl_uint             cl_kernel_info;
typedef cl_uint             cl_kernel_arg_info;
typedef cl_uint             cl_kernel_arg_address_qualifier;
typedef cl_uint             cl_kernel_arg_access_qualifier;
typedef cl_bitfield         cl_kernel_arg_type_qualifier;
typedef cl_uint             cl_kernel_work_group_info;
typedef cl_uint             cl_event_info;
typedef cl_uint             cl_command_type;
typedef cl_uint             cl_profiling_info;


typedef struct _cl_image_format {
    cl_channel_order        image_channel_order;
    cl_channel_type         image_channel_data_type;
} cl_image_format;

typedef struct _cl_image_desc {
    cl_mem_object_type      image_type;
    size_t                  image_width;
    size_t                  image_height;
    size_t                  image_depth;
    size_t                  image_array_size;
    size_t                  image_row_pitch;
    size_t                  image_slice_pitch;
    cl_uint                 num_mip_levels;
    cl_uint                 num_samples;
    cl_mem                  buffer;
} cl_image_desc;

typedef struct _cl_buffer_region {
    size_t                  origin;
    size_t                  size;
} cl_buffer_region;


//////////////////////////////////////////////////////////

#define CL_SUCCESS                                  0
#define CL_DEVICE_NOT_FOUND                         -1
#define CL_DEVICE_NOT_AVAILABLE                     -2
#define CL_COMPILER_NOT_AVAILABLE                   -3
#define CL_MEM_OBJECT_ALLOCATION_FAILURE            -4
#define CL_OUT_OF_RESOURCES                         -5
#define CL_OUT_OF_HOST_MEMORY                       -6
#define CL_PROFILING_INFO_NOT_AVAILABLE             -7
#define CL_MEM_COPY_OVERLAP                         -8
#define CL_IMAGE_FORMAT_MISMATCH                    -9
#define CL_IMAGE_FORMAT_NOT_SUPPORTED               -10
#define CL_BUILD_PROGRAM_FAILURE                    -11
#define CL_MAP_FAILURE                              -12
#define CL_MISALIGNED_SUB_BUFFER_OFFSET             -13
#define CL_EXEC_STATUS_ERROR_FOR_EVENTS_IN_WAIT_LIST -14
#define CL_COMPILE_PROGRAM_FAILURE                  -15
#define CL_LINKER_NOT_AVAILABLE                     -16
#define CL_LINK_PROGRAM_FAILURE                     -17
#define CL_DEVICE_PARTITION_FAILED                  -18
#define CL_KERNEL_ARG_INFO_NOT_AVAILABLE            -19

#define CL_INVALID_VALUE                            -30
#define CL_INVALID_DEVICE_TYPE                      -31
#define CL_INVALID_PLATFORM                         -32
#define CL_INVALID_DEVICE                           -33
#define CL_INVALID_CONTEXT                          -34
#define CL_INVALID_QUEUE_PROPERTIES                 -35
#define CL_INVALID_COMMAND_QUEUE                    -36
#define CL_INVALID_HOST_PTR                         -37
#define CL_INVALID_MEM_OBJECT                       -38
#define CL_INVALID_IMAGE_FORMAT_DESCRIPTOR          -39
#define CL_INVALID_IMAGE_SIZE                       -40
#define CL_INVALID_SAMPLER                          -41
#define CL_INVALID_BINARY                           -42
#define CL_INVALID_BUILD_OPTIONS                    -43
#define CL_INVALID_PROGRAM                          -44
#define CL_INVALID_PROGRAM_EXECUTABLE               -45
#define CL_INVALID_KERNEL_NAME                      -46
#define CL_INVALID_KERNEL_DEFINITION                -47
#define CL_INVALID_KERNEL                           -48
#define CL_INVALID_ARG_INDEX                        -49
#define CL_INVALID_ARG_VALUE                        -50
#define CL_INVALID_ARG_SIZE                         -51
#define CL_INVALID_KERNEL_ARGS                      -52
#define CL_INVALID_WORK_DIMENSION                   -53
#define CL_INVALID_WORK_GROUP_SIZE                  -54
#define CL_INVALID_WORK_ITEM_SIZE                   -55
#define CL_INVALID_GLOBAL_OFFSET                    -56
#define CL_INVALID_EVENT_WAIT_LIST                  -57
#define CL_INVALID_EVENT                            -58
#define CL_INVALID_OPERATION                        -59
#define CL_INVALID_GL_OBJECT                        -60
#define CL_INVALID_BUFFER_SIZE                      -61
#define CL_INVALID_MIP_LEVEL                        -62
#define CL_INVALID_GLOBAL_WORK_SIZE                 -63
#define CL_INVALID_PROPERTY                         -64
#define CL_INVALID_IMAGE_DESCRIPTOR                 -65
#define CL_INVALID_COMPILER_OPTIONS                 -66
#define CL_INVALID_LINKER_OPTIONS                   -67
#define CL_INVALID_DEVICE_PARTITION_COUNT           -68

/*#define CL_VERSION_1_0                              1
#define CL_VERSION_1_1                              1
#define CL_VERSION_1_2                              1*/

#define CL_FALSE                                    0
#define CL_TRUE                                     1
#define CL_BLOCKING                                 CL_TRUE
#define CL_NON_BLOCKING                             CL_FALSE

#define CL_PLATFORM_PROFILE                         0x0900
#define CL_PLATFORM_VERSION                         0x0901
#define CL_PLATFORM_NAME                            0x0902
#define CL_PLATFORM_VENDOR                          0x0903
#define CL_PLATFORM_EXTENSIONS                      0x0904

#define CL_DEVICE_TYPE_DEFAULT                      (1 << 0)
#define CL_DEVICE_TYPE_CPU                          (1 << 1)
#define CL_DEVICE_TYPE_GPU                          (1 << 2)
#define CL_DEVICE_TYPE_ACCELERATOR                  (1 << 3)
#define CL_DEVICE_TYPE_CUSTOM                       (1 << 4)
#define CL_DEVICE_TYPE_ALL                          0xFFFFFFFF
#define CL_DEVICE_TYPE                              0x1000
#define CL_DEVICE_VENDOR_ID                         0x1001
#define CL_DEVICE_MAX_COMPUTE_UNITS                 0x1002
#define CL_DEVICE_MAX_WORK_ITEM_DIMENSIONS          0x1003
#define CL_DEVICE_MAX_WORK_GROUP_SIZE               0x1004
#define CL_DEVICE_MAX_WORK_ITEM_SIZES               0x1005
#define CL_DEVICE_PREFERRED_VECTOR_WIDTH_CHAR       0x1006
#define CL_DEVICE_PREFERRED_VECTOR_WIDTH_SHORT      0x1007
#define CL_DEVICE_PREFERRED_VECTOR_WIDTH_INT        0x1008
#define CL_DEVICE_PREFERRED_VECTOR_WIDTH_LONG       0x1009
#define CL_DEVICE_PREFERRED_VECTOR_WIDTH_FLOAT      0x100A
#define CL_DEVICE_PREFERRED_VECTOR_WIDTH_DOUBLE     0x100B
#define CL_DEVICE_MAX_CLOCK_FREQUENCY               0x100C
#define CL_DEVICE_ADDRESS_BITS                      0x100D
#define CL_DEVICE_MAX_READ_IMAGE_ARGS               0x100E
#define CL_DEVICE_MAX_WRITE_IMAGE_ARGS              0x100F
#define CL_DEVICE_MAX_MEM_ALLOC_SIZE                0x1010
#define CL_DEVICE_IMAGE2D_MAX_WIDTH                 0x1011
#define CL_DEVICE_IMAGE2D_MAX_HEIGHT                0x1012
#define CL_DEVICE_IMAGE3D_MAX_WIDTH                 0x1013
#define CL_DEVICE_IMAGE3D_MAX_HEIGHT                0x1014
#define CL_DEVICE_IMAGE3D_MAX_DEPTH                 0x1015
#define CL_DEVICE_IMAGE_SUPPORT                     0x1016
#define CL_DEVICE_MAX_PARAMETER_SIZE                0x1017
#define CL_DEVICE_MAX_SAMPLERS                      0x1018
#define CL_DEVICE_MEM_BASE_ADDR_ALIGN               0x1019
#define CL_DEVICE_MIN_DATA_TYPE_ALIGN_SIZE          0x101A
#define CL_DEVICE_SINGLE_FP_CONFIG                  0x101B
#define CL_DEVICE_GLOBAL_MEM_CACHE_TYPE             0x101C
#define CL_DEVICE_GLOBAL_MEM_CACHELINE_SIZE         0x101D
#define CL_DEVICE_GLOBAL_MEM_CACHE_SIZE             0x101E
#define CL_DEVICE_GLOBAL_MEM_SIZE                   0x101F
#define CL_DEVICE_MAX_CONSTANT_BUFFER_SIZE          0x1020
#define CL_DEVICE_MAX_CONSTANT_ARGS                 0x1021
#define CL_DEVICE_LOCAL_MEM_TYPE                    0x1022
#define CL_DEVICE_LOCAL_MEM_SIZE                    0x1023
#define CL_DEVICE_ERROR_CORRECTION_SUPPORT          0x1024
#define CL_DEVICE_PROFILING_TIMER_RESOLUTION        0x1025
#define CL_DEVICE_ENDIAN_LITTLE                     0x1026
#define CL_DEVICE_AVAILABLE                         0x1027
#define CL_DEVICE_COMPILER_AVAILABLE                0x1028
#define CL_DEVICE_EXECUTION_CAPABILITIES            0x1029
#define CL_DEVICE_QUEUE_PROPERTIES                  0x102A
#define CL_DEVICE_NAME                              0x102B
#define CL_DEVICE_VENDOR                            0x102C
#define CL_DRIVER_VERSION                           0x102D
#define CL_DEVICE_PROFILE                           0x102E
#define CL_DEVICE_VERSION                           0x102F
#define CL_DEVICE_EXTENSIONS                        0x1030
#define CL_DEVICE_PLATFORM                          0x1031
#define CL_DEVICE_DOUBLE_FP_CONFIG                  0x1032
#define CL_DEVICE_HALF_FP_CONFIG                    0x1033
#define CL_DEVICE_PREFERRED_VECTOR_WIDTH_HALF       0x1034
#define CL_DEVICE_HOST_UNIFIED_MEMORY               0x1035
#define CL_DEVICE_NATIVE_VECTOR_WIDTH_CHAR          0x1036
#define CL_DEVICE_NATIVE_VECTOR_WIDTH_SHORT         0x1037
#define CL_DEVICE_NATIVE_VECTOR_WIDTH_INT           0x1038
#define CL_DEVICE_NATIVE_VECTOR_WIDTH_LONG          0x1039
#define CL_DEVICE_NATIVE_VECTOR_WIDTH_FLOAT         0x103A
#define CL_DEVICE_NATIVE_VECTOR_WIDTH_DOUBLE        0x103B
#define CL_DEVICE_NATIVE_VECTOR_WIDTH_HALF          0x103C
#define CL_DEVICE_OPENCL_C_VERSION                  0x103D
#define CL_DEVICE_LINKER_AVAILABLE                  0x103E
#define CL_DEVICE_BUILT_IN_KERNELS                  0x103F
#define CL_DEVICE_IMAGE_MAX_BUFFER_SIZE             0x1040
#define CL_DEVICE_IMAGE_MAX_ARRAY_SIZE              0x1041
#define CL_DEVICE_PARENT_DEVICE                     0x1042
#define CL_DEVICE_PARTITION_MAX_SUB_DEVICES         0x1043
#define CL_DEVICE_PARTITION_PROPERTIES              0x1044
#define CL_DEVICE_PARTITION_AFFINITY_DOMAIN         0x1045
#define CL_DEVICE_PARTITION_TYPE                    0x1046
#define CL_DEVICE_REFERENCE_COUNT                   0x1047
#define CL_DEVICE_PREFERRED_INTEROP_USER_SYNC       0x1048
#define CL_DEVICE_PRINTF_BUFFER_SIZE                0x1049
#define CL_DEVICE_IMAGE_PITCH_ALIGNMENT             0x104A
#define CL_DEVICE_IMAGE_BASE_ADDRESS_ALIGNMENT      0x104B

#define CL_FP_DENORM                                (1 << 0)
#define CL_FP_INF_NAN                               (1 << 1)
#define CL_FP_ROUND_TO_NEAREST                      (1 << 2)
#define CL_FP_ROUND_TO_ZERO                         (1 << 3)
#define CL_FP_ROUND_TO_INF                          (1 << 4)
#define CL_FP_FMA                                   (1 << 5)
#define CL_FP_SOFT_FLOAT                            (1 << 6)
#define CL_FP_CORRECTLY_ROUNDED_DIVIDE_SQRT         (1 << 7)

#define CL_NONE                                     0x0
#define CL_READ_ONLY_CACHE                          0x1
#define CL_READ_WRITE_CACHE                         0x2
#define CL_LOCAL                                    0x1
#define CL_GLOBAL                                   0x2
#define CL_EXEC_KERNEL                              (1 << 0)
#define CL_EXEC_NATIVE_KERNEL                       (1 << 1)
#define CL_QUEUE_OUT_OF_ORDER_EXEC_MODE_ENABLE      (1 << 0)
#define CL_QUEUE_PROFILING_ENABLE                   (1 << 1)

#define CL_CONTEXT_REFERENCE_COUNT                  0x1080
#define CL_CONTEXT_DEVICES                          0x1081
#define CL_CONTEXT_PROPERTIES                       0x1082
#define CL_CONTEXT_NUM_DEVICES                      0x1083
#define CL_CONTEXT_PLATFORM                         0x1084
#define CL_CONTEXT_INTEROP_USER_SYNC                0x1085

#define CL_DEVICE_PARTITION_EQUALLY                 0x1086
#define CL_DEVICE_PARTITION_BY_COUNTS               0x1087
#define CL_DEVICE_PARTITION_BY_COUNTS_LIST_END      0x0
#define CL_DEVICE_PARTITION_BY_AFFINITY_DOMAIN      0x1088
#define CL_DEVICE_AFFINITY_DOMAIN_NUMA                     (1 << 0)
#define CL_DEVICE_AFFINITY_DOMAIN_L4_CACHE                 (1 << 1)
#define CL_DEVICE_AFFINITY_DOMAIN_L3_CACHE                 (1 << 2)
#define CL_DEVICE_AFFINITY_DOMAIN_L2_CACHE                 (1 << 3)
#define CL_DEVICE_AFFINITY_DOMAIN_L1_CACHE                 (1 << 4)
#define CL_DEVICE_AFFINITY_DOMAIN_NEXT_PARTITIONABLE       (1 << 5)
#define CL_QUEUE_CONTEXT                            0x1090
#define CL_QUEUE_DEVICE                             0x1091
#define CL_QUEUE_REFERENCE_COUNT                    0x1092
#define CL_QUEUE_PROPERTIES                         0x1093
#define CL_MEM_READ_WRITE                           (1 << 0)
#define CL_MEM_WRITE_ONLY                           (1 << 1)
#define CL_MEM_READ_ONLY                            (1 << 2)
#define CL_MEM_USE_HOST_PTR                         (1 << 3)
#define CL_MEM_ALLOC_HOST_PTR                       (1 << 4)
#define CL_MEM_COPY_HOST_PTR                        (1 << 5)
// reserved                                         (1 << 6)
#define CL_MEM_HOST_WRITE_ONLY                      (1 << 7)
#define CL_MEM_HOST_READ_ONLY                       (1 << 8)
#define CL_MEM_HOST_NO_ACCESS                       (1 << 9)
#define CL_MIGRATE_MEM_OBJECT_HOST                  (1 << 0)
#define CL_MIGRATE_MEM_OBJECT_CONTENT_UNDEFINED     (1 << 1)

#define CL_R                                        0x10B0
#define CL_A                                        0x10B1
#define CL_RG                                       0x10B2
#define CL_RA                                       0x10B3
#define CL_RGB                                      0x10B4
#define CL_RGBA                                     0x10B5
#define CL_BGRA                                     0x10B6
#define CL_ARGB                                     0x10B7
#define CL_INTENSITY                                0x10B8
#define CL_LUMINANCE                                0x10B9
#define CL_Rx                                       0x10BA
#define CL_RGx                                      0x10BB
#define CL_RGBx                                     0x10BC
#define CL_DEPTH                                    0x10BD
#define CL_DEPTH_STENCIL                            0x10BE

#define CL_SNORM_INT8                               0x10D0
#define CL_SNORM_INT16                              0x10D1
#define CL_UNORM_INT8                               0x10D2
#define CL_UNORM_INT16                              0x10D3
#define CL_UNORM_SHORT_565                          0x10D4
#define CL_UNORM_SHORT_555                          0x10D5
#define CL_UNORM_INT_101010                         0x10D6
#define CL_SIGNED_INT8                              0x10D7
#define CL_SIGNED_INT16                             0x10D8
#define CL_SIGNED_INT32                             0x10D9
#define CL_UNSIGNED_INT8                            0x10DA
#define CL_UNSIGNED_INT16                           0x10DB
#define CL_UNSIGNED_INT32                           0x10DC
#define CL_HALF_FLOAT                               0x10DD
#define CL_FLOAT                                    0x10DE
#define CL_UNORM_INT24                              0x10DF

#define CL_MEM_OBJECT_BUFFER                        0x10F0
#define CL_MEM_OBJECT_IMAGE2D                       0x10F1
#define CL_MEM_OBJECT_IMAGE3D                       0x10F2
#define CL_MEM_OBJECT_IMAGE2D_ARRAY                 0x10F3
#define CL_MEM_OBJECT_IMAGE1D                       0x10F4
#define CL_MEM_OBJECT_IMAGE1D_ARRAY                 0x10F5
#define CL_MEM_OBJECT_IMAGE1D_BUFFER                0x10F6

#define CL_MEM_TYPE                                 0x1100
#define CL_MEM_FLAGS                                0x1101
#define CL_MEM_SIZE                                 0x1102
#define CL_MEM_HOST_PTR                             0x1103
#define CL_MEM_MAP_COUNT                            0x1104
#define CL_MEM_REFERENCE_COUNT                      0x1105
#define CL_MEM_CONTEXT                              0x1106
#define CL_MEM_ASSOCIATED_MEMOBJECT                 0x1107
#define CL_MEM_OFFSET                               0x1108

#define CL_IMAGE_FORMAT                             0x1110
#define CL_IMAGE_ELEMENT_SIZE                       0x1111
#define CL_IMAGE_ROW_PITCH                          0x1112
#define CL_IMAGE_SLICE_PITCH                        0x1113
#define CL_IMAGE_WIDTH                              0x1114
#define CL_IMAGE_HEIGHT                             0x1115
#define CL_IMAGE_DEPTH                              0x1116
#define CL_IMAGE_ARRAY_SIZE                         0x1117
#define CL_IMAGE_BUFFER                             0x1118
#define CL_IMAGE_NUM_MIP_LEVELS                     0x1119
#define CL_IMAGE_NUM_SAMPLES                        0x111A

#define CL_ADDRESS_NONE                             0x1130
#define CL_ADDRESS_CLAMP_TO_EDGE                    0x1131
#define CL_ADDRESS_CLAMP                            0x1132
#define CL_ADDRESS_REPEAT                           0x1133
#define CL_ADDRESS_MIRRORED_REPEAT                  0x1134

#define CL_FILTER_NEAREST                           0x1140
#define CL_FILTER_LINEAR                            0x1141

#define CL_SAMPLER_REFERENCE_COUNT                  0x1150
#define CL_SAMPLER_CONTEXT                          0x1151
#define CL_SAMPLER_NORMALIZED_COORDS                0x1152
#define CL_SAMPLER_ADDRESSING_MODE                  0x1153
#define CL_SAMPLER_FILTER_MODE                      0x1154

#define CL_MAP_READ                                 (1 << 0)
#define CL_MAP_WRITE                                (1 << 1)
#define CL_MAP_WRITE_INVALIDATE_REGION              (1 << 2)

#define CL_PROGRAM_REFERENCE_COUNT                  0x1160
#define CL_PROGRAM_CONTEXT                          0x1161
#define CL_PROGRAM_NUM_DEVICES                      0x1162
#define CL_PROGRAM_DEVICES                          0x1163
#define CL_PROGRAM_SOURCE                           0x1164
#define CL_PROGRAM_BINARY_SIZES                     0x1165
#define CL_PROGRAM_BINARIES                         0x1166
#define CL_PROGRAM_NUM_KERNELS                      0x1167
#define CL_PROGRAM_KERNEL_NAMES                     0x1168
#define CL_PROGRAM_BUILD_STATUS                     0x1181
#define CL_PROGRAM_BUILD_OPTIONS                    0x1182
#define CL_PROGRAM_BUILD_LOG                        0x1183
#define CL_PROGRAM_BINARY_TYPE                      0x1184
#define CL_PROGRAM_BINARY_TYPE_NONE                 0x0
#define CL_PROGRAM_BINARY_TYPE_COMPILED_OBJECT      0x1
#define CL_PROGRAM_BINARY_TYPE_LIBRARY              0x2
#define CL_PROGRAM_BINARY_TYPE_EXECUTABLE           0x4

#define CL_BUILD_SUCCESS                            0
#define CL_BUILD_NONE                               -1
#define CL_BUILD_ERROR                              -2
#define CL_BUILD_IN_PROGRESS                        -3

#define CL_KERNEL_FUNCTION_NAME                     0x1190
#define CL_KERNEL_NUM_ARGS                          0x1191
#define CL_KERNEL_REFERENCE_COUNT                   0x1192
#define CL_KERNEL_CONTEXT                           0x1193
#define CL_KERNEL_PROGRAM                           0x1194
#define CL_KERNEL_ATTRIBUTES                        0x1195
#define CL_KERNEL_ARG_ADDRESS_QUALIFIER             0x1196
#define CL_KERNEL_ARG_ACCESS_QUALIFIER              0x1197
#define CL_KERNEL_ARG_TYPE_NAME                     0x1198
#define CL_KERNEL_ARG_TYPE_QUALIFIER                0x1199
#define CL_KERNEL_ARG_NAME                          0x119A
#define CL_KERNEL_ARG_ADDRESS_GLOBAL                0x119B
#define CL_KERNEL_ARG_ADDRESS_LOCAL                 0x119C
#define CL_KERNEL_ARG_ADDRESS_CONSTANT              0x119D
#define CL_KERNEL_ARG_ADDRESS_PRIVATE               0x119E
#define CL_KERNEL_ARG_ACCESS_READ_ONLY              0x11A0
#define CL_KERNEL_ARG_ACCESS_WRITE_ONLY             0x11A1
#define CL_KERNEL_ARG_ACCESS_READ_WRITE             0x11A2
#define CL_KERNEL_ARG_ACCESS_NONE                   0x11A3
#define CL_KERNEL_ARG_TYPE_NONE                     0
#define CL_KERNEL_ARG_TYPE_CONST                    (1 << 0)
#define CL_KERNEL_ARG_TYPE_RESTRICT                 (1 << 1)
#define CL_KERNEL_ARG_TYPE_VOLATILE                 (1 << 2)
#define CL_KERNEL_WORK_GROUP_SIZE                   0x11B0
#define CL_KERNEL_COMPILE_WORK_GROUP_SIZE           0x11B1
#define CL_KERNEL_LOCAL_MEM_SIZE                    0x11B2
#define CL_KERNEL_PREFERRED_WORK_GROUP_SIZE_MULTIPLE 0x11B3
#define CL_KERNEL_PRIVATE_MEM_SIZE                  0x11B4
#define CL_KERNEL_GLOBAL_WORK_SIZE                  0x11B5

#define CL_EVENT_COMMAND_QUEUE                      0x11D0
#define CL_EVENT_COMMAND_TYPE                       0x11D1
#define CL_EVENT_REFERENCE_COUNT                    0x11D2
#define CL_EVENT_COMMAND_EXECUTION_STATUS           0x11D3
#define CL_EVENT_CONTEXT                            0x11D4

#define CL_COMMAND_NDRANGE_KERNEL                   0x11F0
#define CL_COMMAND_TASK                             0x11F1
#define CL_COMMAND_NATIVE_KERNEL                    0x11F2
#define CL_COMMAND_READ_BUFFER                      0x11F3
#define CL_COMMAND_WRITE_BUFFER                     0x11F4
#define CL_COMMAND_COPY_BUFFER                      0x11F5
#define CL_COMMAND_READ_IMAGE                       0x11F6
#define CL_COMMAND_WRITE_IMAGE                      0x11F7
#define CL_COMMAND_COPY_IMAGE                       0x11F8
#define CL_COMMAND_COPY_IMAGE_TO_BUFFER             0x11F9
#define CL_COMMAND_COPY_BUFFER_TO_IMAGE             0x11FA
#define CL_COMMAND_MAP_BUFFER                       0x11FB
#define CL_COMMAND_MAP_IMAGE                        0x11FC
#define CL_COMMAND_UNMAP_MEM_OBJECT                 0x11FD
#define CL_COMMAND_MARKER                           0x11FE
#define CL_COMMAND_ACQUIRE_GL_OBJECTS               0x11FF
#define CL_COMMAND_RELEASE_GL_OBJECTS               0x1200
#define CL_COMMAND_READ_BUFFER_RECT                 0x1201
#define CL_COMMAND_WRITE_BUFFER_RECT                0x1202
#define CL_COMMAND_COPY_BUFFER_RECT                 0x1203
#define CL_COMMAND_USER                             0x1204
#define CL_COMMAND_BARRIER                          0x1205
#define CL_COMMAND_MIGRATE_MEM_OBJECTS              0x1206
#define CL_COMMAND_FILL_BUFFER                      0x1207
#define CL_COMMAND_FILL_IMAGE                       0x1208

#define CL_COMPLETE                                 0x0
#define CL_RUNNING                                  0x1
#define CL_SUBMITTED                                0x2
#define CL_QUEUED                                   0x3
#define CL_BUFFER_CREATE_TYPE_REGION                0x1220

#define CL_PROFILING_COMMAND_QUEUED                 0x1280
#define CL_PROFILING_COMMAND_SUBMIT                 0x1281
#define CL_PROFILING_COMMAND_START                  0x1282
#define CL_PROFILING_COMMAND_END                    0x1283

#define CL_CALLBACK CV_STDCALL

static volatile bool g_haveOpenCL = false;
static const char* oclFuncToCheck = "clEnqueueReadBufferRect";

#if defined(__APPLE__)
#include <dlfcn.h>

static void* initOpenCLAndLoad(const char* funcname)
{
    static bool initialized = false;
    static void* handle = 0;
    if (!handle)
    {
        if(!initialized)
        {
            const char* oclpath = getenv("OPENCV_OPENCL_RUNTIME");
            oclpath = oclpath && strlen(oclpath) > 0 ? oclpath :
                "/System/Library/Frameworks/OpenCL.framework/Versions/Current/OpenCL";
            handle = dlopen(oclpath, RTLD_LAZY);
            initialized = true;
            g_haveOpenCL = handle != 0 && dlsym(handle, oclFuncToCheck) != 0;
            if( g_haveOpenCL )
                fprintf(stderr, "Successfully loaded OpenCL v1.1+ runtime from %s\n", oclpath);
            else
                fprintf(stderr, "Failed to load OpenCL runtime\n");
        }
        if(!handle)
            return 0;
    }

    return funcname && handle ? dlsym(handle, funcname) : 0;
}

#elif defined WIN32 || defined _WIN32

#ifndef _WIN32_WINNT           // This is needed for the declaration of TryEnterCriticalSection in winbase.h with Visual Studio 2005 (and older?)
  #define _WIN32_WINNT 0x0400  // http://msdn.microsoft.com/en-us/library/ms686857(VS.85).aspx
#endif
#include <windows.h>
#if (_WIN32_WINNT >= 0x0602)
  #include <synchapi.h>
#endif
#undef small
#undef min
#undef max
#undef abs

static void* initOpenCLAndLoad(const char* funcname)
{
    static bool initialized = false;
    static HMODULE handle = 0;
    if (!handle)
    {
#ifndef HAVE_WINRT
        if(!initialized)
        {
            handle = LoadLibraryA("OpenCL.dll");
            initialized = true;
            g_haveOpenCL = handle != 0 && GetProcAddress(handle, oclFuncToCheck) != 0;
        }
#endif
        if(!handle)
            return 0;
    }

    return funcname ? (void*)GetProcAddress(handle, funcname) : 0;
}

#elif defined(__linux)

#include <dlfcn.h>
#include <stdio.h>

static void* initOpenCLAndLoad(const char* funcname)
{
    static bool initialized = false;
    static void* handle = 0;
    if (!handle)
    {
        if(!initialized)
        {
            handle = dlopen("libOpenCL.so", RTLD_LAZY);
            if(!handle)
                handle = dlopen("libCL.so", RTLD_LAZY);
            initialized = true;
            g_haveOpenCL = handle != 0 && dlsym(handle, oclFuncToCheck) != 0;
        }
        if(!handle)
            return 0;
    }

    return funcname ? (void*)dlsym(handle, funcname) : 0;
}

#else

static void* initOpenCLAndLoad(const char*)
{
    return 0;
}

#endif


#define OCL_FUNC(rettype, funcname, argsdecl, args) \
    typedef rettype (CV_STDCALL * funcname##_t) argsdecl; \
    static rettype funcname argsdecl \
    { \
        static funcname##_t funcname##_p = 0; \
        if( !funcname##_p ) \
        { \
            funcname##_p = (funcname##_t)initOpenCLAndLoad(#funcname); \
            if( !funcname##_p ) \
                return OPENCV_CL_NOT_IMPLEMENTED; \
        } \
        return funcname##_p args; \
    }


#define OCL_FUNC_P(rettype, funcname, argsdecl, args) \
    typedef rettype (CV_STDCALL * funcname##_t) argsdecl; \
    static rettype funcname argsdecl \
    { \
        static funcname##_t funcname##_p = 0; \
        if( !funcname##_p ) \
        { \
            funcname##_p = (funcname##_t)initOpenCLAndLoad(#funcname); \
            if( !funcname##_p ) \
            { \
                if( errcode_ret ) \
                    *errcode_ret = OPENCV_CL_NOT_IMPLEMENTED; \
                return 0; \
            } \
        } \
        return funcname##_p args; \
    }

OCL_FUNC(cl_int, clGetPlatformIDs,
    (cl_uint num_entries, cl_platform_id* platforms, cl_uint* num_platforms),
    (num_entries, platforms, num_platforms))

OCL_FUNC(cl_int, clGetPlatformInfo,
    (cl_platform_id platform, cl_platform_info param_name,
    size_t param_value_size, void * param_value,
    size_t * param_value_size_ret),
    (platform, param_name, param_value_size, param_value, param_value_size_ret))

OCL_FUNC(cl_int, clGetDeviceInfo,
         (cl_device_id device,
          cl_device_info param_name,
          size_t param_value_size,
          void * param_value,
          size_t * param_value_size_ret),
         (device, param_name, param_value_size, param_value, param_value_size_ret))


OCL_FUNC(cl_int, clGetDeviceIDs,
    (cl_platform_id platform,
    cl_device_type device_type,
    cl_uint num_entries,
    cl_device_id * devices,
    cl_uint * num_devices),
    (platform, device_type, num_entries, devices, num_devices))

OCL_FUNC_P(cl_context, clCreateContext,
    (const cl_context_properties * properties,
    cl_uint num_devices,
    const cl_device_id * devices,
    void (CL_CALLBACK * pfn_notify)(const char *, const void *, size_t, void *),
    void * user_data,
    cl_int * errcode_ret),
    (properties, num_devices, devices, pfn_notify, user_data, errcode_ret))

OCL_FUNC(cl_int, clReleaseContext, (cl_context context), (context))

/*
OCL_FUNC(cl_int, clRetainContext, (cl_context context), (context))

OCL_FUNC_P(cl_context, clCreateContextFromType,
    (const cl_context_properties * properties,
    cl_device_type device_type,
    void (CL_CALLBACK * pfn_notify)(const char *, const void *, size_t, void *),
    void * user_data,
    cl_int * errcode_ret),
    (properties, device_type, pfn_notify, user_data, errcode_ret))

OCL_FUNC(cl_int, clGetContextInfo,
    (cl_context context,
    cl_context_info param_name,
    size_t param_value_size,
    void * param_value,
    size_t * param_value_size_ret),
    (context, param_name, param_value_size,
    param_value, param_value_size_ret))
*/
OCL_FUNC_P(cl_command_queue, clCreateCommandQueue,
    (cl_context context,
    cl_device_id device,
    cl_command_queue_properties properties,
    cl_int * errcode_ret),
    (context, device, properties, errcode_ret))

OCL_FUNC(cl_int, clReleaseCommandQueue, (cl_command_queue command_queue), (command_queue))

OCL_FUNC_P(cl_mem, clCreateBuffer,
    (cl_context context,
    cl_mem_flags flags,
    size_t size,
    void * host_ptr,
    cl_int * errcode_ret),
    (context, flags, size, host_ptr, errcode_ret))

/*
OCL_FUNC(cl_int, clRetainCommandQueue, (cl_command_queue command_queue), (command_queue))

OCL_FUNC(cl_int, clGetCommandQueueInfo,
 (cl_command_queue command_queue,
 cl_command_queue_info param_name,
 size_t param_value_size,
 void * param_value,
 size_t * param_value_size_ret),
 (command_queue, param_name, param_value_size, param_value, param_value_size_ret))

OCL_FUNC_P(cl_mem, clCreateSubBuffer,
    (cl_mem buffer,
    cl_mem_flags flags,
    cl_buffer_create_type buffer_create_type,
    const void * buffer_create_info,
    cl_int * errcode_ret),
    (buffer, flags, buffer_create_type, buffer_create_info, errcode_ret))
*/

OCL_FUNC_P(cl_mem, clCreateImage,
    (cl_context context,
    cl_mem_flags flags,
    const cl_image_format * image_format,
    const cl_image_desc * image_desc,
    void * host_ptr,
    cl_int * errcode_ret),
    (context, flags, image_format, image_desc, host_ptr, errcode_ret))

OCL_FUNC_P(cl_mem, clCreateImage2D,
    (cl_context context,
    cl_mem_flags flags,
    const cl_image_format * image_format,
    size_t image_width,
    size_t image_height,
    size_t image_row_pitch,
    void * host_ptr,
    cl_int *errcode_ret),
    (context, flags, image_format, image_width, image_height, image_row_pitch, host_ptr, errcode_ret))

OCL_FUNC(cl_int, clGetSupportedImageFormats,
 (cl_context context,
 cl_mem_flags flags,
 cl_mem_object_type image_type,
 cl_uint num_entries,
 cl_image_format * image_formats,
 cl_uint * num_image_formats),
 (context, flags, image_type, num_entries, image_formats, num_image_formats))

/*
OCL_FUNC(cl_int, clGetMemObjectInfo,
 (cl_mem memobj,
 cl_mem_info param_name,
 size_t param_value_size,
 void * param_value,
 size_t * param_value_size_ret),
 (memobj, param_name, param_value_size, param_value, param_value_size_ret))

OCL_FUNC(cl_int, clGetImageInfo,
 (cl_mem image,
 cl_image_info param_name,
 size_t param_value_size,
 void * param_value,
 size_t * param_value_size_ret),
 (image, param_name, param_value_size, param_value, param_value_size_ret))

OCL_FUNC(cl_int, clCreateKernelsInProgram,
 (cl_program program,
 cl_uint num_kernels,
 cl_kernel * kernels,
 cl_uint * num_kernels_ret),
 (program, num_kernels, kernels, num_kernels_ret))

OCL_FUNC(cl_int, clRetainKernel, (cl_kernel kernel), (kernel))

OCL_FUNC(cl_int, clGetKernelArgInfo,
 (cl_kernel kernel,
 cl_uint arg_indx,
 cl_kernel_arg_info param_name,
 size_t param_value_size,
 void * param_value,
 size_t * param_value_size_ret),
 (kernel, arg_indx, param_name, param_value_size, param_value, param_value_size_ret))

OCL_FUNC(cl_int, clEnqueueReadImage,
 (cl_command_queue command_queue,
 cl_mem image,
 cl_bool blocking_read,
 const size_t * origin[3],
 const size_t * region[3],
 size_t row_pitch,
 size_t slice_pitch,
 void * ptr,
 cl_uint num_events_in_wait_list,
 const cl_event * event_wait_list,
 cl_event * event),
 (command_queue, image, blocking_read, origin, region,
 row_pitch, slice_pitch,
 ptr,
 num_events_in_wait_list,
 event_wait_list,
 event))

OCL_FUNC(cl_int, clEnqueueWriteImage,
 (cl_command_queue command_queue,
 cl_mem image,
 cl_bool blocking_write,
 const size_t * origin[3],
 const size_t * region[3],
 size_t input_row_pitch,
 size_t input_slice_pitch,
 const void * ptr,
 cl_uint num_events_in_wait_list,
 const cl_event * event_wait_list,
 cl_event * event),
 (command_queue, image, blocking_write, origin, region, input_row_pitch,
 input_slice_pitch, ptr, num_events_in_wait_list, event_wait_list, event))

OCL_FUNC(cl_int, clEnqueueFillImage,
 (cl_command_queue command_queue,
 cl_mem image,
 const void * fill_color,
 const size_t * origin[3],
 const size_t * region[3],
 cl_uint num_events_in_wait_list,
 const cl_event * event_wait_list,
 cl_event * event),
 (command_queue, image, fill_color, origin, region,
 num_events_in_wait_list, event_wait_list, event))

OCL_FUNC(cl_int, clEnqueueCopyImage,
 (cl_command_queue command_queue,
 cl_mem src_image,
 cl_mem dst_image,
 const size_t * src_origin[3],
 const size_t * dst_origin[3],
 const size_t * region[3],
 cl_uint num_events_in_wait_list,
 const cl_event * event_wait_list,
 cl_event * event),
 (command_queue, src_image, dst_image, src_origin, dst_origin,
 region, num_events_in_wait_list, event_wait_list, event))

OCL_FUNC(cl_int, clEnqueueCopyImageToBuffer,
 (cl_command_queue command_queue,
 cl_mem src_image,
 cl_mem dst_buffer,
 const size_t * src_origin[3],
 const size_t * region[3],
 size_t dst_offset,
 cl_uint num_events_in_wait_list,
 const cl_event * event_wait_list,
 cl_event * event),
 (command_queue, src_image, dst_buffer, src_origin, region, dst_offset,
 num_events_in_wait_list, event_wait_list, event))
*/

OCL_FUNC(cl_int, clEnqueueCopyBufferToImage,
 (cl_command_queue command_queue,
 cl_mem src_buffer,
 cl_mem dst_image,
 size_t src_offset,
 const size_t dst_origin[3],
 const size_t region[3],
 cl_uint num_events_in_wait_list,
 const cl_event * event_wait_list,
 cl_event * event),
 (command_queue, src_buffer, dst_image, src_offset, dst_origin,
 region, num_events_in_wait_list, event_wait_list, event))

 OCL_FUNC(cl_int, clFlush,
 (cl_command_queue command_queue),
 (command_queue))

/*
OCL_FUNC_P(void*, clEnqueueMapImage,
 (cl_command_queue command_queue,
 cl_mem image,
 cl_bool blocking_map,
 cl_map_flags map_flags,
 const size_t * origin[3],
 const size_t * region[3],
 size_t * image_row_pitch,
 size_t * image_slice_pitch,
 cl_uint num_events_in_wait_list,
 const cl_event * event_wait_list,
 cl_event * event,
 cl_int * errcode_ret),
 (command_queue, image, blocking_map, map_flags, origin, region,
 image_row_pitch, image_slice_pitch, num_events_in_wait_list,
 event_wait_list, event, errcode_ret))
*/

/*
OCL_FUNC(cl_int, clRetainProgram, (cl_program program), (program))

OCL_FUNC(cl_int, clGetKernelInfo,
 (cl_kernel kernel,
 cl_kernel_info param_name,
 size_t param_value_size,
 void * param_value,
 size_t * param_value_size_ret),
 (kernel, param_name, param_value_size, param_value, param_value_size_ret))

OCL_FUNC(cl_int, clRetainMemObject, (cl_mem memobj), (memobj))

*/

OCL_FUNC(cl_int, clReleaseMemObject, (cl_mem memobj), (memobj))


OCL_FUNC_P(cl_program, clCreateProgramWithSource,
    (cl_context context,
    cl_uint count,
    const char ** strings,
    const size_t * lengths,
    cl_int * errcode_ret),
    (context, count, strings, lengths, errcode_ret))

OCL_FUNC_P(cl_program, clCreateProgramWithBinary,
    (cl_context context,
    cl_uint num_devices,
    const cl_device_id * device_list,
    const size_t * lengths,
    const unsigned char ** binaries,
    cl_int * binary_status,
    cl_int * errcode_ret),
    (context, num_devices, device_list, lengths, binaries, binary_status, errcode_ret))

OCL_FUNC(cl_int, clReleaseProgram, (cl_program program), (program))

OCL_FUNC(cl_int, clBuildProgram,
    (cl_program program,
    cl_uint num_devices,
    const cl_device_id * device_list,
    const char * options,
    void (CL_CALLBACK * pfn_notify)(cl_program, void *),
    void * user_data),
    (program, num_devices, device_list, options, pfn_notify, user_data))

OCL_FUNC(cl_int, clGetProgramInfo,
    (cl_program program,
    cl_program_info param_name,
    size_t param_value_size,
    void * param_value,
    size_t * param_value_size_ret),
    (program, param_name, param_value_size, param_value, param_value_size_ret))

OCL_FUNC(cl_int, clGetProgramBuildInfo,
    (cl_program program,
    cl_device_id device,
    cl_program_build_info param_name,
    size_t param_value_size,
    void * param_value,
    size_t * param_value_size_ret),
    (program, device, param_name, param_value_size, param_value, param_value_size_ret))

OCL_FUNC_P(cl_kernel, clCreateKernel,
    (cl_program program,
    const char * kernel_name,
    cl_int * errcode_ret),
    (program, kernel_name, errcode_ret))

OCL_FUNC(cl_int, clReleaseKernel, (cl_kernel kernel), (kernel))

OCL_FUNC(cl_int, clSetKernelArg,
    (cl_kernel kernel,
    cl_uint arg_index,
    size_t arg_size,
    const void * arg_value),
    (kernel, arg_index, arg_size, arg_value))

OCL_FUNC(cl_int, clGetKernelWorkGroupInfo,
    (cl_kernel kernel,
    cl_device_id device,
    cl_kernel_work_group_info param_name,
    size_t param_value_size,
    void * param_value,
    size_t * param_value_size_ret),
    (kernel, device, param_name, param_value_size, param_value, param_value_size_ret))

OCL_FUNC(cl_int, clFinish, (cl_command_queue command_queue), (command_queue))

OCL_FUNC(cl_int, clEnqueueReadBuffer,
    (cl_command_queue command_queue,
    cl_mem buffer,
    cl_bool blocking_read,
    size_t offset,
    size_t size,
    void * ptr,
    cl_uint num_events_in_wait_list,
    const cl_event * event_wait_list,
    cl_event * event),
    (command_queue, buffer, blocking_read, offset, size, ptr,
    num_events_in_wait_list, event_wait_list, event))

OCL_FUNC(cl_int, clEnqueueReadBufferRect,
    (cl_command_queue command_queue,
    cl_mem buffer,
    cl_bool blocking_read,
    const size_t * buffer_offset,
    const size_t * host_offset,
    const size_t * region,
    size_t buffer_row_pitch,
    size_t buffer_slice_pitch,
    size_t host_row_pitch,
    size_t host_slice_pitch,
    void * ptr,
    cl_uint num_events_in_wait_list,
    const cl_event * event_wait_list,
    cl_event * event),
    (command_queue, buffer, blocking_read, buffer_offset, host_offset, region, buffer_row_pitch,
    buffer_slice_pitch, host_row_pitch, host_slice_pitch, ptr, num_events_in_wait_list,
    event_wait_list, event))

OCL_FUNC(cl_int, clEnqueueWriteBuffer,
    (cl_command_queue command_queue,
    cl_mem buffer,
    cl_bool blocking_write,
    size_t offset,
    size_t size,
    const void * ptr,
    cl_uint num_events_in_wait_list,
    const cl_event * event_wait_list,
    cl_event * event),
    (command_queue, buffer, blocking_write, offset, size, ptr,
    num_events_in_wait_list, event_wait_list, event))

OCL_FUNC(cl_int, clEnqueueWriteBufferRect,
    (cl_command_queue command_queue,
    cl_mem buffer,
    cl_bool blocking_write,
    const size_t * buffer_offset,
    const size_t * host_offset,
    const size_t * region,
    size_t buffer_row_pitch,
    size_t buffer_slice_pitch,
    size_t host_row_pitch,
    size_t host_slice_pitch,
    const void * ptr,
    cl_uint num_events_in_wait_list,
    const cl_event * event_wait_list,
    cl_event * event),
    (command_queue, buffer, blocking_write, buffer_offset, host_offset,
    region, buffer_row_pitch, buffer_slice_pitch, host_row_pitch,
    host_slice_pitch, ptr, num_events_in_wait_list, event_wait_list, event))

/*OCL_FUNC(cl_int, clEnqueueFillBuffer,
    (cl_command_queue command_queue,
    cl_mem buffer,
    const void * pattern,
    size_t pattern_size,
    size_t offset,
    size_t size,
    cl_uint num_events_in_wait_list,
    const cl_event * event_wait_list,
    cl_event * event),
    (command_queue, buffer, pattern, pattern_size, offset, size,
    num_events_in_wait_list, event_wait_list, event))*/

OCL_FUNC(cl_int, clEnqueueCopyBuffer,
    (cl_command_queue command_queue,
    cl_mem src_buffer,
    cl_mem dst_buffer,
    size_t src_offset,
    size_t dst_offset,
    size_t size,
    cl_uint num_events_in_wait_list,
    const cl_event * event_wait_list,
    cl_event * event),
    (command_queue, src_buffer, dst_buffer, src_offset, dst_offset,
    size, num_events_in_wait_list, event_wait_list, event))

OCL_FUNC(cl_int, clEnqueueCopyBufferRect,
    (cl_command_queue command_queue,
    cl_mem src_buffer,
    cl_mem dst_buffer,
    const size_t * src_origin,
    const size_t * dst_origin,
    const size_t * region,
    size_t src_row_pitch,
    size_t src_slice_pitch,
    size_t dst_row_pitch,
    size_t dst_slice_pitch,
    cl_uint num_events_in_wait_list,
    const cl_event * event_wait_list,
    cl_event * event),
    (command_queue, src_buffer, dst_buffer, src_origin, dst_origin,
    region, src_row_pitch, src_slice_pitch, dst_row_pitch, dst_slice_pitch,
    num_events_in_wait_list, event_wait_list, event))

OCL_FUNC_P(void*, clEnqueueMapBuffer,
    (cl_command_queue command_queue,
    cl_mem buffer,
    cl_bool blocking_map,
    cl_map_flags map_flags,
    size_t offset,
    size_t size,
    cl_uint num_events_in_wait_list,
    const cl_event * event_wait_list,
    cl_event * event,
    cl_int * errcode_ret),
    (command_queue, buffer, blocking_map, map_flags, offset, size,
    num_events_in_wait_list, event_wait_list, event, errcode_ret))

OCL_FUNC(cl_int, clEnqueueUnmapMemObject,
    (cl_command_queue command_queue,
    cl_mem memobj,
    void * mapped_ptr,
    cl_uint num_events_in_wait_list,
    const cl_event * event_wait_list,
    cl_event * event),
    (command_queue, memobj, mapped_ptr, num_events_in_wait_list, event_wait_list, event))

OCL_FUNC(cl_int, clEnqueueNDRangeKernel,
    (cl_command_queue command_queue,
    cl_kernel kernel,
    cl_uint work_dim,
    const size_t * global_work_offset,
    const size_t * global_work_size,
    const size_t * local_work_size,
    cl_uint num_events_in_wait_list,
    const cl_event * event_wait_list,
    cl_event * event),
    (command_queue, kernel, work_dim, global_work_offset, global_work_size,
    local_work_size, num_events_in_wait_list, event_wait_list, event))

OCL_FUNC(cl_int, clEnqueueTask,
    (cl_command_queue command_queue,
    cl_kernel kernel,
    cl_uint num_events_in_wait_list,
    const cl_event * event_wait_list,
    cl_event * event),
    (command_queue, kernel, num_events_in_wait_list, event_wait_list, event))

OCL_FUNC(cl_int, clSetEventCallback,
    (cl_event event,
    cl_int command_exec_callback_type ,
    void (CL_CALLBACK  *pfn_event_notify) (cl_event event, cl_int event_command_exec_status, void *user_data),
    void *user_data),
    (event, command_exec_callback_type, pfn_event_notify, user_data))

OCL_FUNC(cl_int, clReleaseEvent, (cl_event event), (event))

}

#endif

#ifndef CL_VERSION_1_2
#define CL_VERSION_1_2
#endif

#endif

#ifdef _DEBUG
#define CV_OclDbgAssert CV_DbgAssert
#else
static bool isRaiseError()
{
    static bool initialized = false;
    static bool value = false;
    if (!initialized)
    {
        value = getBoolParameter("OPENCV_OPENCL_RAISE_ERROR", false);
        initialized = true;
    }
    return value;
}
#define CV_OclDbgAssert(expr) do { if (isRaiseError()) { CV_Assert(expr); } else { (void)(expr); } } while ((void)0, 0)
#endif

namespace cv { namespace ocl {

struct UMat2D
{
    UMat2D(const UMat& m)
    {
        offset = (int)m.offset;
        step = (int)m.step;
        rows = m.rows;
        cols = m.cols;
    }
    int offset;
    int step;
    int rows;
    int cols;
};

struct UMat3D
{
    UMat3D(const UMat& m)
    {
        offset = (int)m.offset;
        step = (int)m.step.p[1];
        slicestep = (int)m.step.p[0];
        slices = (int)m.size.p[0];
        rows = m.size.p[1];
        cols = m.size.p[2];
    }
    int offset;
    int slicestep;
    int step;
    int slices;
    int rows;
    int cols;
};

// Computes 64-bit "cyclic redundancy check" sum, as specified in ECMA-182
static uint64 crc64( const uchar* data, size_t size, uint64 crc0=0 )
{
    static uint64 table[256];
    static bool initialized = false;

    if( !initialized )
    {
        for( int i = 0; i < 256; i++ )
        {
            uint64 c = i;
            for( int j = 0; j < 8; j++ )
                c = ((c & 1) ? CV_BIG_UINT(0xc96c5795d7870f42) : 0) ^ (c >> 1);
            table[i] = c;
        }
        initialized = true;
    }

    uint64 crc = ~crc0;
    for( size_t idx = 0; idx < size; idx++ )
        crc = table[(uchar)crc ^ data[idx]] ^ (crc >> 8);

    return ~crc;
}

struct HashKey
{
    typedef uint64 part;
    HashKey(part _a, part _b) : a(_a), b(_b) {}
    part a, b;
};

inline bool operator == (const HashKey& h1, const HashKey& h2)
{
    return h1.a == h2.a && h1.b == h2.b;
}

inline bool operator < (const HashKey& h1, const HashKey& h2)
{
    return h1.a < h2.a || (h1.a == h2.a && h1.b < h2.b);
}


bool haveOpenCL()
{
#ifdef HAVE_OPENCL
    static bool g_isOpenCLInitialized = false;
    static bool g_isOpenCLAvailable = false;

    if (!g_isOpenCLInitialized)
    {
        try
        {
            cl_uint n = 0;
            g_isOpenCLAvailable = ::clGetPlatformIDs(0, NULL, &n) == CL_SUCCESS;
        }
        catch (...)
        {
            g_isOpenCLAvailable = false;
        }
        g_isOpenCLInitialized = true;
    }
    return g_isOpenCLAvailable;
#else
    return false;
#endif
}

bool useOpenCL()
{
    CoreTLSData* data = coreTlsData.get();
    if( data->useOpenCL < 0 )
    {
        try
        {
            data->useOpenCL = (int)haveOpenCL() && Device::getDefault().ptr() != NULL;
        }
        catch (...)
        {
            data->useOpenCL = 0;
        }
    }
    return data->useOpenCL > 0;
}

void setUseOpenCL(bool flag)
{
    if( haveOpenCL() )
    {
        CoreTLSData* data = coreTlsData.get();
        data->useOpenCL = (flag && Device::getDefault().ptr() != NULL) ? 1 : 0;
    }
}

#ifdef HAVE_CLAMDBLAS

class AmdBlasHelper
{
public:
    static AmdBlasHelper & getInstance()
    {
        static AmdBlasHelper amdBlas;
        return amdBlas;
    }

    bool isAvailable() const
    {
        return g_isAmdBlasAvailable;
    }

    ~AmdBlasHelper()
    {
        try
        {
            clAmdBlasTeardown();
        }
        catch (...) { }
    }

protected:
    AmdBlasHelper()
    {
        if (!g_isAmdBlasInitialized)
        {
            AutoLock lock(m);

            if (!g_isAmdBlasInitialized && haveOpenCL())
            {
                try
                {
                    g_isAmdBlasAvailable = clAmdBlasSetup() == clAmdBlasSuccess;
                }
                catch (...)
                {
                    g_isAmdBlasAvailable = false;
                }
            }
            else
                g_isAmdBlasAvailable = false;

            g_isAmdBlasInitialized = true;
        }
    }

private:
    static Mutex m;
    static bool g_isAmdBlasInitialized;
    static bool g_isAmdBlasAvailable;
};

bool AmdBlasHelper::g_isAmdBlasAvailable = false;
bool AmdBlasHelper::g_isAmdBlasInitialized = false;
Mutex AmdBlasHelper::m;

bool haveAmdBlas()
{
    return AmdBlasHelper::getInstance().isAvailable();
}

#else

bool haveAmdBlas()
{
    return false;
}

#endif

#ifdef HAVE_CLAMDFFT

class AmdFftHelper
{
public:
    static AmdFftHelper & getInstance()
    {
        static AmdFftHelper amdFft;
        return amdFft;
    }

    bool isAvailable() const
    {
        return g_isAmdFftAvailable;
    }

    ~AmdFftHelper()
    {
        try
        {
//            clAmdFftTeardown();
        }
        catch (...) { }
    }

protected:
    AmdFftHelper()
    {
        if (!g_isAmdFftInitialized)
        {
            AutoLock lock(m);

            if (!g_isAmdFftInitialized && haveOpenCL())
            {
                try
                {
                    CV_Assert(clAmdFftInitSetupData(&setupData) == CLFFT_SUCCESS);
                    g_isAmdFftAvailable = true;
                }
                catch (const Exception &)
                {
                    g_isAmdFftAvailable = false;
                }
            }
            else
                g_isAmdFftAvailable = false;

            g_isAmdFftInitialized = true;
        }
    }

private:
    static clAmdFftSetupData setupData;
    static Mutex m;
    static bool g_isAmdFftInitialized;
    static bool g_isAmdFftAvailable;
};

clAmdFftSetupData AmdFftHelper::setupData;
bool AmdFftHelper::g_isAmdFftAvailable = false;
bool AmdFftHelper::g_isAmdFftInitialized = false;
Mutex AmdFftHelper::m;

bool haveAmdFft()
{
    return AmdFftHelper::getInstance().isAvailable();
}

#else

bool haveAmdFft()
{
    return false;
}

#endif

void finish()
{
    Queue::getDefault().finish();
}

#define IMPLEMENT_REFCOUNTABLE() \
    void addref() { CV_XADD(&refcount, 1); } \
    void release() { if( CV_XADD(&refcount, -1) == 1 && !cv::__termination) delete this; } \
    int refcount

/////////////////////////////////////////// Platform /////////////////////////////////////////////

struct Platform::Impl
{
    Impl()
    {
        refcount = 1;
        handle = 0;
        initialized = false;
    }

    ~Impl() {}

    void init()
    {
        if( !initialized )
        {
            //cl_uint num_entries
            cl_uint n = 0;
            if( clGetPlatformIDs(1, &handle, &n) != CL_SUCCESS || n == 0 )
                handle = 0;
            if( handle != 0 )
            {
                char buf[1000];
                size_t len = 0;
                CV_OclDbgAssert(clGetPlatformInfo(handle, CL_PLATFORM_VENDOR, sizeof(buf), buf, &len) == CL_SUCCESS);
                buf[len] = '\0';
                vendor = String(buf);
            }

            initialized = true;
        }
    }

    IMPLEMENT_REFCOUNTABLE();

    cl_platform_id handle;
    String vendor;
    bool initialized;
};

Platform::Platform()
{
    p = 0;
}

Platform::~Platform()
{
    if(p)
        p->release();
}

Platform::Platform(const Platform& pl)
{
    p = (Impl*)pl.p;
    if(p)
        p->addref();
}

Platform& Platform::operator = (const Platform& pl)
{
    Impl* newp = (Impl*)pl.p;
    if(newp)
        newp->addref();
    if(p)
        p->release();
    p = newp;
    return *this;
}

void* Platform::ptr() const
{
    return p ? p->handle : 0;
}

Platform& Platform::getDefault()
{
    static Platform p;
    if( !p.p )
    {
        p.p = new Impl;
        p.p->init();
    }
    return p;
}

/////////////////////////////////////// Device ////////////////////////////////////////////

// deviceVersion has format
//   OpenCL<space><major_version.minor_version><space><vendor-specific information>
// by specification
//   http://www.khronos.org/registry/cl/sdk/1.1/docs/man/xhtml/clGetDeviceInfo.html
//   http://www.khronos.org/registry/cl/sdk/1.2/docs/man/xhtml/clGetDeviceInfo.html
static void parseDeviceVersion(const String &deviceVersion, int &major, int &minor)
{
    major = minor = 0;
    if (10 >= deviceVersion.length())
        return;
    const char *pstr = deviceVersion.c_str();
    if (0 != strncmp(pstr, "OpenCL ", 7))
        return;
    size_t ppos = deviceVersion.find('.', 7);
    if (String::npos == ppos)
        return;
    String temp = deviceVersion.substr(7, ppos - 7);
    major = atoi(temp.c_str());
    temp = deviceVersion.substr(ppos + 1);
    minor = atoi(temp.c_str());
}

struct Device::Impl
{
    Impl(void* d)
    {
        handle = (cl_device_id)d;
        refcount = 1;

        name_ = getStrProp(CL_DEVICE_NAME);
        version_ = getStrProp(CL_DEVICE_VERSION);
        doubleFPConfig_ = getProp<cl_device_fp_config, int>(CL_DEVICE_DOUBLE_FP_CONFIG);
        hostUnifiedMemory_ = getBoolProp(CL_DEVICE_HOST_UNIFIED_MEMORY);
        maxComputeUnits_ = getProp<cl_uint, int>(CL_DEVICE_MAX_COMPUTE_UNITS);
        maxWorkGroupSize_ = getProp<size_t, size_t>(CL_DEVICE_MAX_WORK_GROUP_SIZE);
        type_ = getProp<cl_device_type, int>(CL_DEVICE_TYPE);
        driverVersion_ = getStrProp(CL_DRIVER_VERSION);

        String deviceVersion_ = getStrProp(CL_DEVICE_VERSION);
        parseDeviceVersion(deviceVersion_, deviceVersionMajor_, deviceVersionMinor_);

        vendorName_ = getStrProp(CL_DEVICE_VENDOR);
        if (vendorName_ == "Advanced Micro Devices, Inc." ||
            vendorName_ == "AMD")
            vendorID_ = VENDOR_AMD;
        else if (vendorName_ == "Intel(R) Corporation")
            vendorID_ = VENDOR_INTEL;
        else if (vendorName_ == "NVIDIA Corporation")
            vendorID_ = VENDOR_NVIDIA;
        else
            vendorID_ = UNKNOWN_VENDOR;
    }

    template<typename _TpCL, typename _TpOut>
    _TpOut getProp(cl_device_info prop) const
    {
        _TpCL temp=_TpCL();
        size_t sz = 0;

        return clGetDeviceInfo(handle, prop, sizeof(temp), &temp, &sz) == CL_SUCCESS &&
            sz == sizeof(temp) ? _TpOut(temp) : _TpOut();
    }

    bool getBoolProp(cl_device_info prop) const
    {
        cl_bool temp = CL_FALSE;
        size_t sz = 0;

        return clGetDeviceInfo(handle, prop, sizeof(temp), &temp, &sz) == CL_SUCCESS &&
            sz == sizeof(temp) ? temp != 0 : false;
    }

    String getStrProp(cl_device_info prop) const
    {
        char buf[1024];
        size_t sz=0;
        return clGetDeviceInfo(handle, prop, sizeof(buf)-16, buf, &sz) == CL_SUCCESS &&
            sz < sizeof(buf) ? String(buf) : String();
    }

    IMPLEMENT_REFCOUNTABLE();
    cl_device_id handle;

    String name_;
    String version_;
    int doubleFPConfig_;
    bool hostUnifiedMemory_;
    int maxComputeUnits_;
    size_t maxWorkGroupSize_;
    int type_;
    int deviceVersionMajor_;
    int deviceVersionMinor_;
    String driverVersion_;
    String vendorName_;
    int vendorID_;
};


Device::Device()
{
    p = 0;
}

Device::Device(void* d)
{
    p = 0;
    set(d);
}

Device::Device(const Device& d)
{
    p = d.p;
    if(p)
        p->addref();
}

Device& Device::operator = (const Device& d)
{
    Impl* newp = (Impl*)d.p;
    if(newp)
        newp->addref();
    if(p)
        p->release();
    p = newp;
    return *this;
}

Device::~Device()
{
    if(p)
        p->release();
}

void Device::set(void* d)
{
    if(p)
        p->release();
    p = new Impl(d);
}

void* Device::ptr() const
{
    return p ? p->handle : 0;
}

String Device::name() const
{ return p ? p->name_ : String(); }

String Device::extensions() const
{ return p ? p->getStrProp(CL_DEVICE_EXTENSIONS) : String(); }

String Device::version() const
{ return p ? p->version_ : String(); }

String Device::vendorName() const
{ return p ? p->vendorName_ : String(); }

int Device::vendorID() const
{ return p ? p->vendorID_ : 0; }

String Device::OpenCL_C_Version() const
{ return p ? p->getStrProp(CL_DEVICE_OPENCL_C_VERSION) : String(); }

String Device::OpenCLVersion() const
{ return p ? p->getStrProp(CL_DEVICE_EXTENSIONS) : String(); }

int Device::deviceVersionMajor() const
{ return p ? p->deviceVersionMajor_ : 0; }

int Device::deviceVersionMinor() const
{ return p ? p->deviceVersionMinor_ : 0; }

String Device::driverVersion() const
{ return p ? p->driverVersion_ : String(); }

int Device::type() const
{ return p ? p->type_ : 0; }

int Device::addressBits() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_ADDRESS_BITS) : 0; }

bool Device::available() const
{ return p ? p->getBoolProp(CL_DEVICE_AVAILABLE) : false; }

bool Device::compilerAvailable() const
{ return p ? p->getBoolProp(CL_DEVICE_COMPILER_AVAILABLE) : false; }

bool Device::linkerAvailable() const
#ifdef CL_VERSION_1_2
{ return p ? p->getBoolProp(CL_DEVICE_LINKER_AVAILABLE) : false; }
#else
{ CV_REQUIRE_OPENCL_1_2_ERROR; }
#endif

int Device::doubleFPConfig() const
{ return p ? p->doubleFPConfig_ : 0; }

int Device::singleFPConfig() const
{ return p ? p->getProp<cl_device_fp_config, int>(CL_DEVICE_SINGLE_FP_CONFIG) : 0; }

int Device::halfFPConfig() const
#ifdef CL_VERSION_1_2
{ return p ? p->getProp<cl_device_fp_config, int>(CL_DEVICE_HALF_FP_CONFIG) : 0; }
#else
{ CV_REQUIRE_OPENCL_1_2_ERROR; }
#endif

bool Device::endianLittle() const
{ return p ? p->getBoolProp(CL_DEVICE_ENDIAN_LITTLE) : false; }

bool Device::errorCorrectionSupport() const
{ return p ? p->getBoolProp(CL_DEVICE_ERROR_CORRECTION_SUPPORT) : false; }

int Device::executionCapabilities() const
{ return p ? p->getProp<cl_device_exec_capabilities, int>(CL_DEVICE_EXECUTION_CAPABILITIES) : 0; }

size_t Device::globalMemCacheSize() const
{ return p ? p->getProp<cl_ulong, size_t>(CL_DEVICE_GLOBAL_MEM_CACHE_SIZE) : 0; }

int Device::globalMemCacheType() const
{ return p ? p->getProp<cl_device_mem_cache_type, int>(CL_DEVICE_GLOBAL_MEM_CACHE_TYPE) : 0; }

int Device::globalMemCacheLineSize() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_GLOBAL_MEM_CACHELINE_SIZE) : 0; }

size_t Device::globalMemSize() const
{ return p ? p->getProp<cl_ulong, size_t>(CL_DEVICE_GLOBAL_MEM_SIZE) : 0; }

size_t Device::localMemSize() const
{ return p ? p->getProp<cl_ulong, size_t>(CL_DEVICE_LOCAL_MEM_SIZE) : 0; }

int Device::localMemType() const
{ return p ? p->getProp<cl_device_local_mem_type, int>(CL_DEVICE_LOCAL_MEM_TYPE) : 0; }

bool Device::hostUnifiedMemory() const
{ return p ? p->hostUnifiedMemory_ : false; }

bool Device::imageSupport() const
{ return p ? p->getBoolProp(CL_DEVICE_IMAGE_SUPPORT) : false; }

bool Device::imageFromBufferSupport() const
{
    bool ret = false;
    if (p)
    {
        size_t pos = p->getStrProp(CL_DEVICE_EXTENSIONS).find("cl_khr_image2d_from_buffer");
        if (pos != String::npos)
        {
            ret = true;
        }
    }
    return ret;
}

uint Device::imagePitchAlignment() const
{
#ifdef CL_DEVICE_IMAGE_PITCH_ALIGNMENT
    return p ? p->getProp<cl_uint, uint>(CL_DEVICE_IMAGE_PITCH_ALIGNMENT) : 0;
#else
    return 0;
#endif
}

uint Device::imageBaseAddressAlignment() const
{
#ifdef CL_DEVICE_IMAGE_BASE_ADDRESS_ALIGNMENT
    return p ? p->getProp<cl_uint, uint>(CL_DEVICE_IMAGE_BASE_ADDRESS_ALIGNMENT) : 0;
#else
    return 0;
#endif
}

size_t Device::image2DMaxWidth() const
{ return p ? p->getProp<size_t, size_t>(CL_DEVICE_IMAGE2D_MAX_WIDTH) : 0; }

size_t Device::image2DMaxHeight() const
{ return p ? p->getProp<size_t, size_t>(CL_DEVICE_IMAGE2D_MAX_HEIGHT) : 0; }

size_t Device::image3DMaxWidth() const
{ return p ? p->getProp<size_t, size_t>(CL_DEVICE_IMAGE3D_MAX_WIDTH) : 0; }

size_t Device::image3DMaxHeight() const
{ return p ? p->getProp<size_t, size_t>(CL_DEVICE_IMAGE3D_MAX_HEIGHT) : 0; }

size_t Device::image3DMaxDepth() const
{ return p ? p->getProp<size_t, size_t>(CL_DEVICE_IMAGE3D_MAX_DEPTH) : 0; }

size_t Device::imageMaxBufferSize() const
#ifdef CL_VERSION_1_2
{ return p ? p->getProp<size_t, size_t>(CL_DEVICE_IMAGE_MAX_BUFFER_SIZE) : 0; }
#else
{ CV_REQUIRE_OPENCL_1_2_ERROR; }
#endif

size_t Device::imageMaxArraySize() const
#ifdef CL_VERSION_1_2
{ return p ? p->getProp<size_t, size_t>(CL_DEVICE_IMAGE_MAX_ARRAY_SIZE) : 0; }
#else
{ CV_REQUIRE_OPENCL_1_2_ERROR; }
#endif

int Device::maxClockFrequency() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_MAX_CLOCK_FREQUENCY) : 0; }

int Device::maxComputeUnits() const
{ return p ? p->maxComputeUnits_ : 0; }

int Device::maxConstantArgs() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_MAX_CONSTANT_ARGS) : 0; }

size_t Device::maxConstantBufferSize() const
{ return p ? p->getProp<cl_ulong, size_t>(CL_DEVICE_MAX_CONSTANT_BUFFER_SIZE) : 0; }

size_t Device::maxMemAllocSize() const
{ return p ? p->getProp<cl_ulong, size_t>(CL_DEVICE_MAX_MEM_ALLOC_SIZE) : 0; }

size_t Device::maxParameterSize() const
{ return p ? p->getProp<cl_ulong, size_t>(CL_DEVICE_MAX_PARAMETER_SIZE) : 0; }

int Device::maxReadImageArgs() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_MAX_READ_IMAGE_ARGS) : 0; }

int Device::maxWriteImageArgs() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_MAX_WRITE_IMAGE_ARGS) : 0; }

int Device::maxSamplers() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_MAX_SAMPLERS) : 0; }

size_t Device::maxWorkGroupSize() const
{ return p ? p->maxWorkGroupSize_ : 0; }

int Device::maxWorkItemDims() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_MAX_WORK_ITEM_DIMENSIONS) : 0; }

void Device::maxWorkItemSizes(size_t* sizes) const
{
    if(p)
    {
        const int MAX_DIMS = 32;
        size_t retsz = 0;
        CV_OclDbgAssert(clGetDeviceInfo(p->handle, CL_DEVICE_MAX_WORK_ITEM_SIZES,
                MAX_DIMS*sizeof(sizes[0]), &sizes[0], &retsz) == CL_SUCCESS);
    }
}

int Device::memBaseAddrAlign() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_MEM_BASE_ADDR_ALIGN) : 0; }

int Device::nativeVectorWidthChar() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_NATIVE_VECTOR_WIDTH_CHAR) : 0; }

int Device::nativeVectorWidthShort() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_NATIVE_VECTOR_WIDTH_SHORT) : 0; }

int Device::nativeVectorWidthInt() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_NATIVE_VECTOR_WIDTH_INT) : 0; }

int Device::nativeVectorWidthLong() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_NATIVE_VECTOR_WIDTH_LONG) : 0; }

int Device::nativeVectorWidthFloat() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_NATIVE_VECTOR_WIDTH_FLOAT) : 0; }

int Device::nativeVectorWidthDouble() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_NATIVE_VECTOR_WIDTH_DOUBLE) : 0; }

int Device::nativeVectorWidthHalf() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_NATIVE_VECTOR_WIDTH_HALF) : 0; }

int Device::preferredVectorWidthChar() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_PREFERRED_VECTOR_WIDTH_CHAR) : 0; }

int Device::preferredVectorWidthShort() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_PREFERRED_VECTOR_WIDTH_SHORT) : 0; }

int Device::preferredVectorWidthInt() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_PREFERRED_VECTOR_WIDTH_INT) : 0; }

int Device::preferredVectorWidthLong() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_PREFERRED_VECTOR_WIDTH_LONG) : 0; }

int Device::preferredVectorWidthFloat() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_PREFERRED_VECTOR_WIDTH_FLOAT) : 0; }

int Device::preferredVectorWidthDouble() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_PREFERRED_VECTOR_WIDTH_DOUBLE) : 0; }

int Device::preferredVectorWidthHalf() const
{ return p ? p->getProp<cl_uint, int>(CL_DEVICE_PREFERRED_VECTOR_WIDTH_HALF) : 0; }

size_t Device::printfBufferSize() const
#ifdef CL_VERSION_1_2
{ return p ? p->getProp<size_t, size_t>(CL_DEVICE_PRINTF_BUFFER_SIZE) : 0; }
#else
{ CV_REQUIRE_OPENCL_1_2_ERROR; }
#endif


size_t Device::profilingTimerResolution() const
{ return p ? p->getProp<size_t, size_t>(CL_DEVICE_PROFILING_TIMER_RESOLUTION) : 0; }

const Device& Device::getDefault()
{
    const Context& ctx = Context::getDefault();
    int idx = coreTlsData.get()->device;
    return ctx.device(idx);
}

////////////////////////////////////// Context ///////////////////////////////////////////////////

template <typename Functor, typename ObjectType>
inline cl_int getStringInfo(Functor f, ObjectType obj, cl_uint name, std::string& param)
{
    ::size_t required;
    cl_int err = f(obj, name, 0, NULL, &required);
    if (err != CL_SUCCESS)
        return err;

    param.clear();
    if (required > 0)
    {
        AutoBuffer<char> buf(required + 1);
        char* ptr = (char*)buf; // cleanup is not needed
        err = f(obj, name, required, ptr, NULL);
        if (err != CL_SUCCESS)
            return err;
        param = ptr;
    }

    return CL_SUCCESS;
}

static void split(const std::string &s, char delim, std::vector<std::string> &elems)
{
    elems.clear();
    if (s.size() == 0)
        return;
    std::istringstream ss(s);
    std::string item;
    while (!ss.eof())
    {
        std::getline(ss, item, delim);
        elems.push_back(item);
    }
}

// Layout: <Platform>:<CPU|GPU|ACCELERATOR|nothing=GPU/CPU>:<deviceName>
// Sample: AMD:GPU:
// Sample: AMD:GPU:Tahiti
// Sample: :GPU|CPU: = '' = ':' = '::'
static bool parseOpenCLDeviceConfiguration(const std::string& configurationStr,
        std::string& platform, std::vector<std::string>& deviceTypes, std::string& deviceNameOrID)
{
    std::vector<std::string> parts;
    split(configurationStr, ':', parts);
    if (parts.size() > 3)
    {
        std::cerr << "ERROR: Invalid configuration string for OpenCL device" << std::endl;
        return false;
    }
    if (parts.size() > 2)
        deviceNameOrID = parts[2];
    if (parts.size() > 1)
    {
        split(parts[1], '|', deviceTypes);
    }
    if (parts.size() > 0)
    {
        platform = parts[0];
    }
    return true;
}

#ifdef HAVE_WINRT
static cl_device_id selectOpenCLDevice()
{
    return NULL;
}
#else
static cl_device_id selectOpenCLDevice()
{
    std::string platform, deviceName;
    std::vector<std::string> deviceTypes;

    const char* configuration = getenv("OPENCV_OPENCL_DEVICE");
    if (configuration && !parseOpenCLDeviceConfiguration(std::string(configuration), platform, deviceTypes, deviceName))
        return NULL;

    bool isID = false;
    int deviceID = -1;
    if (deviceName.length() == 1)
    // We limit ID range to 0..9, because we want to write:
    // - '2500' to mean i5-2500
    // - '8350' to mean AMD FX-8350
    // - '650' to mean GeForce 650
    // To extend ID range change condition to '> 0'
    {
        isID = true;
        for (size_t i = 0; i < deviceName.length(); i++)
        {
            if (!isdigit(deviceName[i]))
            {
                isID = false;
                break;
            }
        }
        if (isID)
        {
            deviceID = atoi(deviceName.c_str());
            if (deviceID < 0)
                return NULL;
        }
    }

    std::vector<cl_platform_id> platforms;
    {
        cl_uint numPlatforms = 0;
        CV_OclDbgAssert(clGetPlatformIDs(0, NULL, &numPlatforms) == CL_SUCCESS);

        if (numPlatforms == 0)
            return NULL;
        platforms.resize((size_t)numPlatforms);
        CV_OclDbgAssert(clGetPlatformIDs(numPlatforms, &platforms[0], &numPlatforms) == CL_SUCCESS);
        platforms.resize(numPlatforms);
    }

    int selectedPlatform = -1;
    if (platform.length() > 0)
    {
        for (size_t i = 0; i < platforms.size(); i++)
        {
            std::string name;
            CV_OclDbgAssert(getStringInfo(clGetPlatformInfo, platforms[i], CL_PLATFORM_NAME, name) == CL_SUCCESS);
            if (name.find(platform) != std::string::npos)
            {
                selectedPlatform = (int)i;
                break;
            }
        }
        if (selectedPlatform == -1)
        {
            std::cerr << "ERROR: Can't find OpenCL platform by name: " << platform << std::endl;
            goto not_found;
        }
    }
    if (deviceTypes.size() == 0)
    {
        if (!isID)
        {
            deviceTypes.push_back("GPU");
            if (configuration)
                deviceTypes.push_back("CPU");
        }
        else
            deviceTypes.push_back("ALL");
    }
    for (size_t t = 0; t < deviceTypes.size(); t++)
    {
        int deviceType = 0;
        std::string tempStrDeviceType = deviceTypes[t];
        std::transform( tempStrDeviceType.begin(), tempStrDeviceType.end(), tempStrDeviceType.begin(), tolower );

        if (tempStrDeviceType == "gpu" || tempStrDeviceType == "dgpu" || tempStrDeviceType == "igpu")
            deviceType = Device::TYPE_GPU;
        else if (tempStrDeviceType == "cpu")
            deviceType = Device::TYPE_CPU;
        else if (tempStrDeviceType == "accelerator")
            deviceType = Device::TYPE_ACCELERATOR;
        else if (tempStrDeviceType == "all")
            deviceType = Device::TYPE_ALL;
        else
        {
            std::cerr << "ERROR: Unsupported device type for OpenCL device (GPU, CPU, ACCELERATOR): " << deviceTypes[t] << std::endl;
            goto not_found;
        }

        std::vector<cl_device_id> devices; // TODO Use clReleaseDevice to cleanup
        for (int i = selectedPlatform >= 0 ? selectedPlatform : 0;
                (selectedPlatform >= 0 ? i == selectedPlatform : true) && (i < (int)platforms.size());
                i++)
        {
            cl_uint count = 0;
            cl_int status = clGetDeviceIDs(platforms[i], deviceType, 0, NULL, &count);
            CV_OclDbgAssert(status == CL_SUCCESS || status == CL_DEVICE_NOT_FOUND);
            if (count == 0)
                continue;
            size_t base = devices.size();
            devices.resize(base + count);
            status = clGetDeviceIDs(platforms[i], deviceType, count, &devices[base], &count);
            CV_OclDbgAssert(status == CL_SUCCESS || status == CL_DEVICE_NOT_FOUND);
        }

        for (size_t i = (isID ? deviceID : 0);
             (isID ? (i == (size_t)deviceID) : true) && (i < devices.size());
             i++)
        {
            std::string name;
            CV_OclDbgAssert(getStringInfo(clGetDeviceInfo, devices[i], CL_DEVICE_NAME, name) == CL_SUCCESS);
            cl_bool useGPU = true;
            if(tempStrDeviceType == "dgpu" || tempStrDeviceType == "igpu")
            {
                cl_bool isIGPU = CL_FALSE;
                clGetDeviceInfo(devices[i], CL_DEVICE_HOST_UNIFIED_MEMORY, sizeof(isIGPU), &isIGPU, NULL);
                useGPU = tempStrDeviceType == "dgpu" ? !isIGPU : isIGPU;
            }
            if ( (isID || name.find(deviceName) != std::string::npos) && useGPU)
            {
                // TODO check for OpenCL 1.1
                return devices[i];
            }
        }
    }

not_found:
    std::cerr << "ERROR: Required OpenCL device not found, check configuration: " << (configuration == NULL ? "" : configuration) << std::endl
            << "    Platform: " << (platform.length() == 0 ? "any" : platform) << std::endl
            << "    Device types: ";
    for (size_t t = 0; t < deviceTypes.size(); t++)
        std::cerr << deviceTypes[t] << " ";

    std::cerr << std::endl << "    Device name: " << (deviceName.length() == 0 ? "any" : deviceName) << std::endl;
    CV_Error(CL_INVALID_DEVICE, "Requested OpenCL device is not found");
    return NULL;
}
#endif

struct Context::Impl
{
    Impl()
    {
        refcount = 1;
        handle = 0;
    }

    void setDefault()
    {
        CV_Assert(handle == NULL);

        cl_device_id d = selectOpenCLDevice();

        if (d == NULL)
            return;

        cl_platform_id pl = NULL;
        CV_OclDbgAssert(clGetDeviceInfo(d, CL_DEVICE_PLATFORM, sizeof(cl_platform_id), &pl, NULL) == CL_SUCCESS);

        cl_context_properties prop[] =
        {
            CL_CONTEXT_PLATFORM, (cl_context_properties)pl,
            0
        };

        // !!! in the current implementation force the number of devices to 1 !!!
        cl_uint nd = 1;
        cl_int status;

        handle = clCreateContext(prop, nd, &d, 0, 0, &status);

        bool ok = handle != 0 && status == CL_SUCCESS;
        if( ok )
        {
            devices.resize(nd);
            devices[0].set(d);
        }
        else
            handle = NULL;
    }

    Impl(int dtype0)
    {
        refcount = 1;
        handle = 0;

        cl_int retval = 0;
        cl_platform_id pl = (cl_platform_id)Platform::getDefault().ptr();
        cl_context_properties prop[] =
        {
            CL_CONTEXT_PLATFORM, (cl_context_properties)pl,
            0
        };

        cl_uint i, nd0 = 0, nd = 0;
        int dtype = dtype0 & 15;
        CV_OclDbgAssert(clGetDeviceIDs( pl, dtype, 0, 0, &nd0 ) == CL_SUCCESS);

        AutoBuffer<void*> dlistbuf(nd0*2+1);
        cl_device_id* dlist = (cl_device_id*)(void**)dlistbuf;
        cl_device_id* dlist_new = dlist + nd0;
        CV_OclDbgAssert(clGetDeviceIDs(	pl, dtype, nd0, dlist, &nd0 ) == CL_SUCCESS);
        String name0;

        for(i = 0; i < nd0; i++)
        {
            Device d(dlist[i]);
            if( !d.available() || !d.compilerAvailable() )
                continue;
            if( dtype0 == Device::TYPE_DGPU && d.hostUnifiedMemory() )
                continue;
            if( dtype0 == Device::TYPE_IGPU && !d.hostUnifiedMemory() )
                continue;
            String name = d.name();
            if( nd != 0 && name != name0 )
                continue;
            name0 = name;
            dlist_new[nd++] = dlist[i];
        }

        if(nd == 0)
            return;

        // !!! in the current implementation force the number of devices to 1 !!!
        nd = 1;

        handle = clCreateContext(prop, nd, dlist_new, 0, 0, &retval);
        bool ok = handle != 0 && retval == CL_SUCCESS;
        if( ok )
        {
            devices.resize(nd);
            for( i = 0; i < nd; i++ )
                devices[i].set(dlist_new[i]);
        }
    }

    ~Impl()
    {
        if(handle)
        {
            clReleaseContext(handle);
            handle = NULL;
        }
        devices.clear();
    }

    Program getProg(const ProgramSource& src,
                    const String& buildflags, String& errmsg)
    {
        String prefix = Program::getPrefix(buildflags);
        HashKey k(src.hash(), crc64((const uchar*)prefix.c_str(), prefix.size()));
        phash_t::iterator it = phash.find(k);
        if( it != phash.end() )
            return it->second;
        //String filename = format("%08x%08x_%08x%08x.clb2",
        Program prog(src, buildflags, errmsg);
        if(prog.ptr())
            phash.insert(std::pair<HashKey,Program>(k, prog));
        return prog;
    }

    IMPLEMENT_REFCOUNTABLE();

    cl_context handle;
    std::vector<Device> devices;

    typedef ProgramSource::hash_t hash_t;

    struct HashKey
    {
        HashKey(hash_t _a, hash_t _b) : a(_a), b(_b) {}
        bool operator < (const HashKey& k) const { return a < k.a || (a == k.a && b < k.b); }
        bool operator == (const HashKey& k) const { return a == k.a && b == k.b; }
        bool operator != (const HashKey& k) const { return a != k.a || b != k.b; }
        hash_t a, b;
    };
    typedef std::map<HashKey, Program> phash_t;
    phash_t phash;
};


Context::Context()
{
    p = 0;
}

Context::Context(int dtype)
{
    p = 0;
    create(dtype);
}

bool Context::create()
{
    if( !haveOpenCL() )
        return false;
    if(p)
        p->release();
    p = new Impl();
    if(!p->handle)
    {
        delete p;
        p = 0;
    }
    return p != 0;
}

bool Context::create(int dtype0)
{
    if( !haveOpenCL() )
        return false;
    if(p)
        p->release();
    p = new Impl(dtype0);
    if(!p->handle)
    {
        delete p;
        p = 0;
    }
    return p != 0;
}

Context::~Context()
{
    if (p)
    {
        p->release();
        p = NULL;
    }
}

Context::Context(const Context& c)
{
    p = (Impl*)c.p;
    if(p)
        p->addref();
}

Context& Context::operator = (const Context& c)
{
    Impl* newp = (Impl*)c.p;
    if(newp)
        newp->addref();
    if(p)
        p->release();
    p = newp;
    return *this;
}

void* Context::ptr() const
{
    return p == NULL ? NULL : p->handle;
}

size_t Context::ndevices() const
{
    return p ? p->devices.size() : 0;
}

const Device& Context::device(size_t idx) const
{
    static Device dummy;
    return !p || idx >= p->devices.size() ? dummy : p->devices[idx];
}

Context& Context::getDefault(bool initialize)
{
    static Context* ctx = new Context();
    if(!ctx->p && haveOpenCL())
    {
        if (!ctx->p)
            ctx->p = new Impl();
        if (initialize)
        {
            // do not create new Context right away.
            // First, try to retrieve existing context of the same type.
            // In its turn, Platform::getContext() may call Context::create()
            // if there is no such context.
            if (ctx->p->handle == NULL)
                ctx->p->setDefault();
        }
    }

    return *ctx;
}

Program Context::getProg(const ProgramSource& prog,
                         const String& buildopts, String& errmsg)
{
    return p ? p->getProg(prog, buildopts, errmsg) : Program();
}

void initializeContextFromHandle(Context& ctx, void* platform, void* _context, void* _device)
{
    cl_context context = (cl_context)_context;
    cl_device_id device = (cl_device_id)_device;

    // cleanup old context
    Context::Impl * impl = ctx.p;
    if (impl->handle)
    {
        CV_OclDbgAssert(clReleaseContext(impl->handle) == CL_SUCCESS);
    }
    impl->devices.clear();

    impl->handle = context;
    impl->devices.resize(1);
    impl->devices[0].set(device);

    Platform& p = Platform::getDefault();
    Platform::Impl* pImpl = p.p;
    pImpl->handle = (cl_platform_id)platform;
}

/////////////////////////////////////////// Queue /////////////////////////////////////////////

struct Queue::Impl
{
    Impl(const Context& c, const Device& d)
    {
        refcount = 1;
        const Context* pc = &c;
        cl_context ch = (cl_context)pc->ptr();
        if( !ch )
        {
            pc = &Context::getDefault();
            ch = (cl_context)pc->ptr();
        }
        cl_device_id dh = (cl_device_id)d.ptr();
        if( !dh )
            dh = (cl_device_id)pc->device(0).ptr();
        cl_int retval = 0;
        handle = clCreateCommandQueue(ch, dh, 0, &retval);
        CV_OclDbgAssert(retval == CL_SUCCESS);
    }

    ~Impl()
    {
#ifdef _WIN32
        if (!cv::__termination)
#endif
        {
            if(handle)
            {
                clFinish(handle);
                clReleaseCommandQueue(handle);
                handle = NULL;
            }
        }
    }

    IMPLEMENT_REFCOUNTABLE();

    cl_command_queue handle;
};

Queue::Queue()
{
    p = 0;
}

Queue::Queue(const Context& c, const Device& d)
{
    p = 0;
    create(c, d);
}

Queue::Queue(const Queue& q)
{
    p = q.p;
    if(p)
        p->addref();
}

Queue& Queue::operator = (const Queue& q)
{
    Impl* newp = (Impl*)q.p;
    if(newp)
        newp->addref();
    if(p)
        p->release();
    p = newp;
    return *this;
}

Queue::~Queue()
{
    if(p)
        p->release();
}

bool Queue::create(const Context& c, const Device& d)
{
    if(p)
        p->release();
    p = new Impl(c, d);
    return p->handle != 0;
}

void Queue::finish()
{
    if(p && p->handle)
    {
        CV_OclDbgAssert(clFinish(p->handle) == CL_SUCCESS);
    }
}

void* Queue::ptr() const
{
    return p ? p->handle : 0;
}

Queue& Queue::getDefault()
{
    Queue& q = coreTlsData.get()->oclQueue;
    if( !q.p && haveOpenCL() )
        q.create(Context::getDefault());
    return q;
}

static cl_command_queue getQueue(const Queue& q)
{
    cl_command_queue qq = (cl_command_queue)q.ptr();
    if(!qq)
        qq = (cl_command_queue)Queue::getDefault().ptr();
    return qq;
}

/////////////////////////////////////////// KernelArg /////////////////////////////////////////////

KernelArg::KernelArg()
    : flags(0), m(0), obj(0), sz(0), wscale(1), iwscale(1)
{
}

KernelArg::KernelArg(int _flags, UMat* _m, int _wscale, int _iwscale, const void* _obj, size_t _sz)
    : flags(_flags), m(_m), obj(_obj), sz(_sz), wscale(_wscale), iwscale(_iwscale)
{
}

KernelArg KernelArg::Constant(const Mat& m)
{
    CV_Assert(m.isContinuous());
    return KernelArg(CONSTANT, 0, 0, 0, m.data, m.total()*m.elemSize());
}

/////////////////////////////////////////// Kernel /////////////////////////////////////////////

struct Kernel::Impl
{
    Impl(const char* kname, const Program& prog) :
        refcount(1), e(0), nu(0)
    {
        cl_program ph = (cl_program)prog.ptr();
        cl_int retval = 0;
        handle = ph != 0 ?
            clCreateKernel(ph, kname, &retval) : 0;
        CV_OclDbgAssert(retval == CL_SUCCESS);
        for( int i = 0; i < MAX_ARRS; i++ )
            u[i] = 0;
        haveTempDstUMats = false;
    }

    void cleanupUMats()
    {
        for( int i = 0; i < MAX_ARRS; i++ )
            if( u[i] )
            {
                if( CV_XADD(&u[i]->urefcount, -1) == 1 )
                    u[i]->currAllocator->deallocate(u[i]);
                u[i] = 0;
            }
        nu = 0;
        haveTempDstUMats = false;
    }

    void addUMat(const UMat& m, bool dst)
    {
        CV_Assert(nu < MAX_ARRS && m.u && m.u->urefcount > 0);
        u[nu] = m.u;
        CV_XADD(&m.u->urefcount, 1);
        nu++;
        if(dst && m.u->tempUMat())
            haveTempDstUMats = true;
    }

    void addImage(const Image2D& image)
    {
        images.push_back(image);
    }

    void finit()
    {
        cleanupUMats();
        images.clear();
        if(e) { clReleaseEvent(e); e = 0; }
        release();
    }

    ~Impl()
    {
        if(handle)
            clReleaseKernel(handle);
    }

    IMPLEMENT_REFCOUNTABLE();

    cl_kernel handle;
    cl_event e;
    enum { MAX_ARRS = 16 };
    UMatData* u[MAX_ARRS];
    int nu;
    std::list<Image2D> images;
    bool haveTempDstUMats;
};

}}

extern "C"
{
static void CL_CALLBACK oclCleanupCallback(cl_event, cl_int, void *p)
{
    ((cv::ocl::Kernel::Impl*)p)->finit();
}

}

namespace cv { namespace ocl {

Kernel::Kernel()
{
    p = 0;
}

Kernel::Kernel(const char* kname, const Program& prog)
{
    p = 0;
    create(kname, prog);
}

Kernel::Kernel(const char* kname, const ProgramSource& src,
               const String& buildopts, String* errmsg)
{
    p = 0;
    create(kname, src, buildopts, errmsg);
}

Kernel::Kernel(const Kernel& k)
{
    p = k.p;
    if(p)
        p->addref();
}

Kernel& Kernel::operator = (const Kernel& k)
{
    Impl* newp = (Impl*)k.p;
    if(newp)
        newp->addref();
    if(p)
        p->release();
    p = newp;
    return *this;
}

Kernel::~Kernel()
{
    if(p)
        p->release();
}

bool Kernel::create(const char* kname, const Program& prog)
{
    if(p)
        p->release();
    p = new Impl(kname, prog);
    if(p->handle == 0)
    {
        p->release();
        p = 0;
    }
    return p != 0;
}

bool Kernel::create(const char* kname, const ProgramSource& src,
                    const String& buildopts, String* errmsg)
{
    if(p)
    {
        p->release();
        p = 0;
    }
    String tempmsg;
    if( !errmsg ) errmsg = &tempmsg;
    const Program& prog = Context::getDefault().getProg(src, buildopts, *errmsg);
    return create(kname, prog);
}

void* Kernel::ptr() const
{
    return p ? p->handle : 0;
}

bool Kernel::empty() const
{
    return ptr() == 0;
}

int Kernel::set(int i, const void* value, size_t sz)
{
    if (!p || !p->handle)
        return -1;
    if (i < 0)
        return i;
    if( i == 0 )
        p->cleanupUMats();

    cl_int retval = clSetKernelArg(p->handle, (cl_uint)i, sz, value);
    CV_OclDbgAssert(retval == CL_SUCCESS);
    if (retval != CL_SUCCESS)
        return -1;
    return i+1;
}

int Kernel::set(int i, const Image2D& image2D)
{
    p->addImage(image2D);
    cl_mem h = (cl_mem)image2D.ptr();
    return set(i, &h, sizeof(h));
}

int Kernel::set(int i, const UMat& m)
{
    return set(i, KernelArg(KernelArg::READ_WRITE, (UMat*)&m, 0, 0));
}

int Kernel::set(int i, const KernelArg& arg)
{
    if( !p || !p->handle )
        return -1;
    if (i < 0)
        return i;
    if( i == 0 )
        p->cleanupUMats();
    if( arg.m )
    {
        int accessFlags = ((arg.flags & KernelArg::READ_ONLY) ? ACCESS_READ : 0) +
                          ((arg.flags & KernelArg::WRITE_ONLY) ? ACCESS_WRITE : 0);
        bool ptronly = (arg.flags & KernelArg::PTR_ONLY) != 0;
        cl_mem h = (cl_mem)arg.m->handle(accessFlags);

        if (!h)
        {
            p->release();
            p = 0;
            return -1;
        }

        if (ptronly)
            CV_OclDbgAssert(clSetKernelArg(p->handle, (cl_uint)i++, sizeof(h), &h) == CL_SUCCESS);
        else if( arg.m->dims <= 2 )
        {
            UMat2D u2d(*arg.m);
            CV_OclDbgAssert(clSetKernelArg(p->handle, (cl_uint)i, sizeof(h), &h) == CL_SUCCESS);
            CV_OclDbgAssert(clSetKernelArg(p->handle, (cl_uint)(i+1), sizeof(u2d.step), &u2d.step) == CL_SUCCESS);
            CV_OclDbgAssert(clSetKernelArg(p->handle, (cl_uint)(i+2), sizeof(u2d.offset), &u2d.offset) == CL_SUCCESS);
            i += 3;

            if( !(arg.flags & KernelArg::NO_SIZE) )
            {
                int cols = u2d.cols*arg.wscale/arg.iwscale;
                CV_OclDbgAssert(clSetKernelArg(p->handle, (cl_uint)i, sizeof(u2d.rows), &u2d.rows) == CL_SUCCESS);
                CV_OclDbgAssert(clSetKernelArg(p->handle, (cl_uint)(i+1), sizeof(cols), &cols) == CL_SUCCESS);
                i += 2;
            }
        }
        else
        {
            UMat3D u3d(*arg.m);
            CV_OclDbgAssert(clSetKernelArg(p->handle, (cl_uint)i, sizeof(h), &h) == CL_SUCCESS);
            CV_OclDbgAssert(clSetKernelArg(p->handle, (cl_uint)(i+1), sizeof(u3d.slicestep), &u3d.slicestep) == CL_SUCCESS);
            CV_OclDbgAssert(clSetKernelArg(p->handle, (cl_uint)(i+2), sizeof(u3d.step), &u3d.step) == CL_SUCCESS);
            CV_OclDbgAssert(clSetKernelArg(p->handle, (cl_uint)(i+3), sizeof(u3d.offset), &u3d.offset) == CL_SUCCESS);
            i += 4;
            if( !(arg.flags & KernelArg::NO_SIZE) )
            {
                int cols = u3d.cols*arg.wscale/arg.iwscale;
                CV_OclDbgAssert(clSetKernelArg(p->handle, (cl_uint)i, sizeof(u3d.slices), &u3d.rows) == CL_SUCCESS);
                CV_OclDbgAssert(clSetKernelArg(p->handle, (cl_uint)(i+1), sizeof(u3d.rows), &u3d.rows) == CL_SUCCESS);
                CV_OclDbgAssert(clSetKernelArg(p->handle, (cl_uint)(i+2), sizeof(u3d.cols), &cols) == CL_SUCCESS);
                i += 3;
            }
        }
        p->addUMat(*arg.m, (accessFlags & ACCESS_WRITE) != 0);
        return i;
    }
    CV_OclDbgAssert(clSetKernelArg(p->handle, (cl_uint)i, arg.sz, arg.obj) == CL_SUCCESS);
    return i+1;
}


bool Kernel::run(int dims, size_t _globalsize[], size_t _localsize[],
                 bool sync, const Queue& q)
{
    if(!p || !p->handle || p->e != 0)
        return false;

    cl_command_queue qq = getQueue(q);
    size_t offset[CV_MAX_DIM] = {0}, globalsize[CV_MAX_DIM] = {1,1,1};
    size_t total = 1;
    CV_Assert(_globalsize != 0);
    for (int i = 0; i < dims; i++)
    {
        size_t val = _localsize ? _localsize[i] :
            dims == 1 ? 64 : dims == 2 ? (i == 0 ? 256 : 8) : dims == 3 ? (8>>(int)(i>0)) : 1;
        CV_Assert( val > 0 );
        total *= _globalsize[i];
        globalsize[i] = ((_globalsize[i] + val - 1)/val)*val;
    }
    if( total == 0 )
        return true;
    if( p->haveTempDstUMats )
        sync = true;
    cl_int retval = clEnqueueNDRangeKernel(qq, p->handle, (cl_uint)dims,
                                           offset, globalsize, _localsize, 0, 0,
                                           sync ? 0 : &p->e);
    if( sync || retval != CL_SUCCESS )
    {
        CV_OclDbgAssert(clFinish(qq) == CL_SUCCESS);
        p->cleanupUMats();
    }
    else
    {
        p->addref();
        CV_OclDbgAssert(clSetEventCallback(p->e, CL_COMPLETE, oclCleanupCallback, p) == CL_SUCCESS);
    }
    return retval == CL_SUCCESS;
}

bool Kernel::runTask(bool sync, const Queue& q)
{
    if(!p || !p->handle || p->e != 0)
        return false;

    cl_command_queue qq = getQueue(q);
    cl_int retval = clEnqueueTask(qq, p->handle, 0, 0, sync ? 0 : &p->e);
    if( sync || retval != CL_SUCCESS )
    {
        CV_OclDbgAssert(clFinish(qq) == CL_SUCCESS);
        p->cleanupUMats();
    }
    else
    {
        p->addref();
        CV_OclDbgAssert(clSetEventCallback(p->e, CL_COMPLETE, oclCleanupCallback, p) == CL_SUCCESS);
    }
    return retval == CL_SUCCESS;
}


size_t Kernel::workGroupSize() const
{
    if(!p || !p->handle)
        return 0;
    size_t val = 0, retsz = 0;
    cl_device_id dev = (cl_device_id)Device::getDefault().ptr();
    return clGetKernelWorkGroupInfo(p->handle, dev, CL_KERNEL_WORK_GROUP_SIZE,
                                    sizeof(val), &val, &retsz) == CL_SUCCESS ? val : 0;
}

size_t Kernel::preferedWorkGroupSizeMultiple() const
{
    if(!p || !p->handle)
        return 0;
    size_t val = 0, retsz = 0;
    cl_device_id dev = (cl_device_id)Device::getDefault().ptr();
    return clGetKernelWorkGroupInfo(p->handle, dev, CL_KERNEL_PREFERRED_WORK_GROUP_SIZE_MULTIPLE,
                                    sizeof(val), &val, &retsz) == CL_SUCCESS ? val : 0;
}

bool Kernel::compileWorkGroupSize(size_t wsz[]) const
{
    if(!p || !p->handle || !wsz)
        return 0;
    size_t retsz = 0;
    cl_device_id dev = (cl_device_id)Device::getDefault().ptr();
    return clGetKernelWorkGroupInfo(p->handle, dev, CL_KERNEL_COMPILE_WORK_GROUP_SIZE,
                                    sizeof(wsz[0]*3), wsz, &retsz) == CL_SUCCESS;
}

size_t Kernel::localMemSize() const
{
    if(!p || !p->handle)
        return 0;
    size_t retsz = 0;
    cl_ulong val = 0;
    cl_device_id dev = (cl_device_id)Device::getDefault().ptr();
    return clGetKernelWorkGroupInfo(p->handle, dev, CL_KERNEL_LOCAL_MEM_SIZE,
                                    sizeof(val), &val, &retsz) == CL_SUCCESS ? (size_t)val : 0;
}

/////////////////////////////////////////// Program /////////////////////////////////////////////

struct Program::Impl
{
    Impl(const ProgramSource& _src,
         const String& _buildflags, String& errmsg)
    {
        refcount = 1;
        const Context& ctx = Context::getDefault();
        src = _src;
        buildflags = _buildflags;
        const String& srcstr = src.source();
        const char* srcptr = srcstr.c_str();
        size_t srclen = srcstr.size();
        cl_int retval = 0;

        handle = clCreateProgramWithSource((cl_context)ctx.ptr(), 1, &srcptr, &srclen, &retval);
        if( handle && retval == CL_SUCCESS )
        {
            int i, n = (int)ctx.ndevices();
            AutoBuffer<void*> deviceListBuf(n+1);
            void** deviceList = deviceListBuf;
            for( i = 0; i < n; i++ )
                deviceList[i] = ctx.device(i).ptr();

            Device device = Device::getDefault();
            if (device.isAMD())
                buildflags += " -D AMD_DEVICE";
            else if (device.isIntel())
                buildflags += " -D INTEL_DEVICE";

            retval = clBuildProgram(handle, n,
                                    (const cl_device_id*)deviceList,
                                    buildflags.c_str(), 0, 0);
#if !CV_OPENCL_ALWAYS_SHOW_BUILD_LOG
            if( retval != CL_SUCCESS )
#endif
            {
                size_t retsz = 0;
                cl_int buildInfo_retval = clGetProgramBuildInfo(handle, (cl_device_id)deviceList[0],
                                               CL_PROGRAM_BUILD_LOG, 0, 0, &retsz);
                if (buildInfo_retval == CL_SUCCESS && retsz > 1)
                {
                    AutoBuffer<char> bufbuf(retsz + 16);
                    char* buf = bufbuf;
                    buildInfo_retval = clGetProgramBuildInfo(handle, (cl_device_id)deviceList[0],
                                                   CL_PROGRAM_BUILD_LOG, retsz+1, buf, &retsz);
                    if (buildInfo_retval == CL_SUCCESS)
                    {
                        // TODO It is useful to see kernel name & program file name also
                        errmsg = String(buf);
                        printf("OpenCL program build log: %s\n%s\n", buildflags.c_str(), errmsg.c_str());
                        fflush(stdout);
                    }
                }
                if (retval != CL_SUCCESS && handle)
                {
                    clReleaseProgram(handle);
                    handle = NULL;
                }
            }
        }
    }

    Impl(const String& _buf, const String& _buildflags)
    {
        refcount = 1;
        handle = 0;
        buildflags = _buildflags;
        if(_buf.empty())
            return;
        String prefix0 = Program::getPrefix(buildflags);
        const Context& ctx = Context::getDefault();
        const Device& dev = Device::getDefault();
        const char* pos0 = _buf.c_str();
        const char* pos1 = strchr(pos0, '\n');
        if(!pos1)
            return;
        const char* pos2 = strchr(pos1+1, '\n');
        if(!pos2)
            return;
        const char* pos3 = strchr(pos2+1, '\n');
        if(!pos3)
            return;
        size_t prefixlen = (pos3 - pos0)+1;
        String prefix(pos0, prefixlen);
        if( prefix != prefix0 )
            return;
        const uchar* bin = (uchar*)(pos3+1);
        void* devid = dev.ptr();
        size_t codelen = _buf.length() - prefixlen;
        cl_int binstatus = 0, retval = 0;
        handle = clCreateProgramWithBinary((cl_context)ctx.ptr(), 1, (cl_device_id*)&devid,
                                           &codelen, &bin, &binstatus, &retval);
        CV_OclDbgAssert(retval == CL_SUCCESS);
    }

    String store()
    {
        if(!handle)
            return String();
        size_t progsz = 0, retsz = 0;
        String prefix = Program::getPrefix(buildflags);
        size_t prefixlen = prefix.length();
        if(clGetProgramInfo(handle, CL_PROGRAM_BINARY_SIZES, sizeof(progsz), &progsz, &retsz) != CL_SUCCESS)
            return String();
        AutoBuffer<uchar> bufbuf(prefixlen + progsz + 16);
        uchar* buf = bufbuf;
        memcpy(buf, prefix.c_str(), prefixlen);
        buf += prefixlen;
        if(clGetProgramInfo(handle, CL_PROGRAM_BINARIES, sizeof(buf), &buf, &retsz) != CL_SUCCESS)
            return String();
        buf[progsz] = (uchar)'\0';
        return String((const char*)(uchar*)bufbuf, prefixlen + progsz);
    }

    ~Impl()
    {
        if( handle )
        {
#ifdef _WIN32
            if (!cv::__termination)
#endif
            {
                clReleaseProgram(handle);
            }
            handle = NULL;
        }
    }

    IMPLEMENT_REFCOUNTABLE();

    ProgramSource src;
    String buildflags;
    cl_program handle;
};


Program::Program() { p = 0; }

Program::Program(const ProgramSource& src,
        const String& buildflags, String& errmsg)
{
    p = 0;
    create(src, buildflags, errmsg);
}

Program::Program(const Program& prog)
{
    p = prog.p;
    if(p)
        p->addref();
}

Program& Program::operator = (const Program& prog)
{
    Impl* newp = (Impl*)prog.p;
    if(newp)
        newp->addref();
    if(p)
        p->release();
    p = newp;
    return *this;
}

Program::~Program()
{
    if(p)
        p->release();
}

bool Program::create(const ProgramSource& src,
            const String& buildflags, String& errmsg)
{
    if(p)
        p->release();
    p = new Impl(src, buildflags, errmsg);
    if(!p->handle)
    {
        p->release();
        p = 0;
    }
    return p != 0;
}

const ProgramSource& Program::source() const
{
    static ProgramSource dummy;
    return p ? p->src : dummy;
}

void* Program::ptr() const
{
    return p ? p->handle : 0;
}

bool Program::read(const String& bin, const String& buildflags)
{
    if(p)
        p->release();
    p = new Impl(bin, buildflags);
    return p->handle != 0;
}

bool Program::write(String& bin) const
{
    if(!p)
        return false;
    bin = p->store();
    return !bin.empty();
}

String Program::getPrefix() const
{
    if(!p)
        return String();
    return getPrefix(p->buildflags);
}

String Program::getPrefix(const String& buildflags)
{
    const Context& ctx = Context::getDefault();
    const Device& dev = ctx.device(0);
    return format("name=%s\ndriver=%s\nbuildflags=%s\n",
                  dev.name().c_str(), dev.driverVersion().c_str(), buildflags.c_str());
}

///////////////////////////////////////// ProgramSource ///////////////////////////////////////////////

struct ProgramSource::Impl
{
    Impl(const char* _src)
    {
        init(String(_src));
    }
    Impl(const String& _src)
    {
        init(_src);
    }
    void init(const String& _src)
    {
        refcount = 1;
        src = _src;
        h = crc64((uchar*)src.c_str(), src.size());
    }

    IMPLEMENT_REFCOUNTABLE();
    String src;
    ProgramSource::hash_t h;
};


ProgramSource::ProgramSource()
{
    p = 0;
}

ProgramSource::ProgramSource(const char* prog)
{
    p = new Impl(prog);
}

ProgramSource::ProgramSource(const String& prog)
{
    p = new Impl(prog);
}

ProgramSource::~ProgramSource()
{
    if(p)
        p->release();
}

ProgramSource::ProgramSource(const ProgramSource& prog)
{
    p = prog.p;
    if(p)
        p->addref();
}

ProgramSource& ProgramSource::operator = (const ProgramSource& prog)
{
    Impl* newp = (Impl*)prog.p;
    if(newp)
        newp->addref();
    if(p)
        p->release();
    p = newp;
    return *this;
}

const String& ProgramSource::source() const
{
    static String dummy;
    return p ? p->src : dummy;
}

ProgramSource::hash_t ProgramSource::hash() const
{
    return p ? p->h : 0;
}

//////////////////////////////////////////// OpenCLAllocator //////////////////////////////////////////////////

class OpenCLBufferPool
{
protected:
    ~OpenCLBufferPool() { }
public:
    virtual cl_mem allocate(size_t size, CV_OUT size_t& capacity) = 0;
    virtual void release(cl_mem handle, size_t capacity) = 0;
};

class OpenCLBufferPoolImpl : public BufferPoolController, public OpenCLBufferPool
{
public:
    struct BufferEntry
    {
        cl_mem clBuffer_;
        size_t capacity_;
    };
protected:
    Mutex mutex_;

    size_t currentReservedSize;
    size_t maxReservedSize;

    std::list<BufferEntry> reservedEntries_; // LRU order

    // synchronized
    bool _findAndRemoveEntryFromReservedList(CV_OUT BufferEntry& entry, const size_t size)
    {
        if (reservedEntries_.empty())
            return false;
        std::list<BufferEntry>::iterator i = reservedEntries_.begin();
        std::list<BufferEntry>::iterator result_pos = reservedEntries_.end();
        BufferEntry result = {NULL, 0};
        size_t minDiff = (size_t)(-1);
        for (; i != reservedEntries_.end(); ++i)
        {
            BufferEntry& e = *i;
            if (e.capacity_ >= size)
            {
                size_t diff = e.capacity_ - size;
                if (diff < size / 8 && (result_pos == reservedEntries_.end() || diff < minDiff))
                {
                    minDiff = diff;
                    result_pos = i;
                    result = e;
                    if (diff == 0)
                        break;
                }
            }
        }
        if (result_pos != reservedEntries_.end())
        {
            //CV_DbgAssert(result == *result_pos);
            reservedEntries_.erase(result_pos);
            entry = result;
            currentReservedSize -= entry.capacity_;
            return true;
        }
        return false;
    }

    // synchronized
    void _checkSizeOfReservedEntries()
    {
        while (currentReservedSize > maxReservedSize)
        {
            CV_DbgAssert(!reservedEntries_.empty());
            const BufferEntry& entry = reservedEntries_.back();
            CV_DbgAssert(currentReservedSize >= entry.capacity_);
            currentReservedSize -= entry.capacity_;
            _releaseBufferEntry(entry);
            reservedEntries_.pop_back();
        }
    }

    inline size_t _allocationGranularity(size_t size)
    {
        // heuristic values
        if (size < 1024)
            return 16;
        else if (size < 64*1024)
            return 64;
        else if (size < 1024*1024)
            return 4096;
        else if (size < 16*1024*1024)
            return 64*1024;
        else
            return 1024*1024;
    }

    void _allocateBufferEntry(BufferEntry& entry, size_t size)
    {
        CV_DbgAssert(entry.clBuffer_ == NULL);
        entry.capacity_ = alignSize(size, (int)_allocationGranularity(size));
        Context& ctx = Context::getDefault();
        cl_int retval = CL_SUCCESS;
        entry.clBuffer_ = clCreateBuffer((cl_context)ctx.ptr(), CL_MEM_READ_WRITE, entry.capacity_, 0, &retval);
        CV_Assert(retval == CL_SUCCESS);
        CV_Assert(entry.clBuffer_ != NULL);
        LOG_BUFFER_POOL("OpenCL allocate %lld (0x%llx) bytes: %p\n",
                (long long)entry.capacity_, (long long)entry.capacity_, entry.clBuffer_);
    }

    void _releaseBufferEntry(const BufferEntry& entry)
    {
        CV_Assert(entry.capacity_ != 0);
        CV_Assert(entry.clBuffer_ != NULL);
        LOG_BUFFER_POOL("OpenCL release buffer: %p, %lld (0x%llx) bytes\n",
                entry.clBuffer_, (long long)entry.capacity_, (long long)entry.capacity_);
        clReleaseMemObject(entry.clBuffer_);
    }
public:
    OpenCLBufferPoolImpl()
        : currentReservedSize(0), maxReservedSize(0)
    {
        int poolSize = ocl::Device::getDefault().isIntel() ? 1 << 27 : 0;
        maxReservedSize = getConfigurationParameterForSize("OPENCV_OPENCL_BUFFERPOOL_LIMIT", poolSize);
    }
    virtual ~OpenCLBufferPoolImpl()
    {
        freeAllReservedBuffers();
        CV_Assert(reservedEntries_.empty());
    }
public:
    virtual cl_mem allocate(size_t size, CV_OUT size_t& capacity)
    {
        BufferEntry entry = {NULL, 0};
        if (maxReservedSize > 0)
        {
            AutoLock locker(mutex_);
            if (_findAndRemoveEntryFromReservedList(entry, size))
            {
                CV_DbgAssert(size <= entry.capacity_);
                LOG_BUFFER_POOL("Reuse reserved buffer: %p\n", entry.clBuffer_);
                capacity = entry.capacity_;
                return entry.clBuffer_;
            }
        }
        _allocateBufferEntry(entry, size);
        capacity = entry.capacity_;
        return entry.clBuffer_;
    }
    virtual void release(cl_mem handle, size_t capacity)
    {
        BufferEntry entry = {handle, capacity};
        if (maxReservedSize == 0 || entry.capacity_ > maxReservedSize / 8)
        {
            _releaseBufferEntry(entry);
        }
        else
        {
            AutoLock locker(mutex_);
            reservedEntries_.push_front(entry);
            currentReservedSize += entry.capacity_;
            _checkSizeOfReservedEntries();
        }
    }

    virtual size_t getReservedSize() const { return currentReservedSize; }
    virtual size_t getMaxReservedSize() const { return maxReservedSize; }
    virtual void setMaxReservedSize(size_t size)
    {
        AutoLock locker(mutex_);
        size_t oldMaxReservedSize = maxReservedSize;
        maxReservedSize = size;
        if (maxReservedSize < oldMaxReservedSize)
        {
            std::list<BufferEntry>::iterator i = reservedEntries_.begin();
            for (; i != reservedEntries_.end();)
            {
                const BufferEntry& entry = *i;
                if (entry.capacity_ > maxReservedSize / 8)
                {
                    CV_DbgAssert(currentReservedSize >= entry.capacity_);
                    currentReservedSize -= entry.capacity_;
                    _releaseBufferEntry(entry);
                    i = reservedEntries_.erase(i);
                    continue;
                }
                ++i;
            }
            _checkSizeOfReservedEntries();
        }
    }
    virtual void freeAllReservedBuffers()
    {
        AutoLock locker(mutex_);
        std::list<BufferEntry>::const_iterator i = reservedEntries_.begin();
        for (; i != reservedEntries_.end(); ++i)
        {
            const BufferEntry& entry = *i;
            _releaseBufferEntry(entry);
        }
        reservedEntries_.clear();
    }
};

#if defined _MSC_VER
#pragma warning(disable:4127) // conditional expression is constant
#endif
template <bool readAccess, bool writeAccess>
class AlignedDataPtr
{
protected:
    const size_t size_;
    uchar* const originPtr_;
    const size_t alignment_;
    uchar* ptr_;
    uchar* allocatedPtr_;

public:
    AlignedDataPtr(uchar* ptr, size_t size, size_t alignment)
        : size_(size), originPtr_(ptr), alignment_(alignment), ptr_(ptr), allocatedPtr_(NULL)
    {
        CV_DbgAssert((alignment & (alignment - 1)) == 0); // check for 2^n
        if (((size_t)ptr_ & (alignment - 1)) != 0)
        {
            allocatedPtr_ = new uchar[size_ + alignment - 1];
            ptr_ = (uchar*)(((uintptr_t)allocatedPtr_ + (alignment - 1)) & ~(alignment - 1));
            if (readAccess)
            {
                memcpy(ptr_, originPtr_, size_);
            }
        }
    }

    uchar* getAlignedPtr() const
    {
        CV_DbgAssert(((size_t)ptr_ & (alignment_ - 1)) == 0);
        return ptr_;
    }

    ~AlignedDataPtr()
    {
        if (allocatedPtr_)
        {
            if (writeAccess)
            {
                memcpy(originPtr_, ptr_, size_);
            }
            delete[] allocatedPtr_;
            allocatedPtr_ = NULL;
        }
        ptr_ = NULL;
    }
private:
    AlignedDataPtr(const AlignedDataPtr&); // disabled
    AlignedDataPtr& operator=(const AlignedDataPtr&); // disabled
};
#if defined _MSC_VER
#pragma warning(default:4127) // conditional expression is constant
#endif

#ifndef CV_OPENCL_DATA_PTR_ALIGNMENT
#define CV_OPENCL_DATA_PTR_ALIGNMENT 16
#endif

class OpenCLAllocator : public MatAllocator
{
    mutable OpenCLBufferPoolImpl bufferPool;
    enum AllocatorFlags
    {
        ALLOCATOR_FLAGS_BUFFER_POOL_USED = 1 << 0
    };
public:
    OpenCLAllocator() { matStdAllocator = Mat::getStdAllocator(); }

    UMatData* defaultAllocate(int dims, const int* sizes, int type, void* data, size_t* step,
            int flags, UMatUsageFlags usageFlags) const
    {
        UMatData* u = matStdAllocator->allocate(dims, sizes, type, data, step, flags, usageFlags);
        return u;
    }

    void getBestFlags(const Context& ctx, int /*flags*/, UMatUsageFlags usageFlags, int& createFlags, int& flags0) const
    {
        const Device& dev = ctx.device(0);
        createFlags = 0;
        if ((usageFlags & USAGE_ALLOCATE_HOST_MEMORY) != 0)
            createFlags |= CL_MEM_ALLOC_HOST_PTR;

        if( dev.hostUnifiedMemory() )
            flags0 = 0;
        else
            flags0 = UMatData::COPY_ON_MAP;
    }

    UMatData* allocate(int dims, const int* sizes, int type,
                       void* data, size_t* step, int flags, UMatUsageFlags usageFlags) const
    {
        if(!useOpenCL())
            return defaultAllocate(dims, sizes, type, data, step, flags, usageFlags);
        CV_Assert(data == 0);
        size_t total = CV_ELEM_SIZE(type);
        for( int i = dims-1; i >= 0; i-- )
        {
            if( step )
                step[i] = total;
            total *= sizes[i];
        }

        Context& ctx = Context::getDefault();
        int createFlags = 0, flags0 = 0;
        getBestFlags(ctx, flags, usageFlags, createFlags, flags0);

        size_t capacity = 0;
        void* handle = NULL;
        int allocatorFlags = 0;
        if (createFlags == 0)
        {
            handle = bufferPool.allocate(total, capacity);
            if (!handle)
                return defaultAllocate(dims, sizes, type, data, step, flags, usageFlags);
            allocatorFlags = ALLOCATOR_FLAGS_BUFFER_POOL_USED;
        }
        else
        {
            capacity = total;
            cl_int retval = 0;
            handle = clCreateBuffer((cl_context)ctx.ptr(),
                                          CL_MEM_READ_WRITE|createFlags, total, 0, &retval);
            if( !handle || retval != CL_SUCCESS )
                return defaultAllocate(dims, sizes, type, data, step, flags, usageFlags);
        }
        UMatData* u = new UMatData(this);
        u->data = 0;
        u->size = total;
        u->capacity = capacity;
        u->handle = handle;
        u->flags = flags0;
        u->allocatorFlags_ = allocatorFlags;
        CV_DbgAssert(!u->tempUMat()); // for bufferPool.release() consistency in deallocate()
        return u;
    }

    bool allocate(UMatData* u, int accessFlags, UMatUsageFlags usageFlags) const
    {
        if(!u)
            return false;

        UMatDataAutoLock lock(u);

        if(u->handle == 0)
        {
            CV_Assert(u->origdata != 0);
            Context& ctx = Context::getDefault();
            int createFlags = 0, flags0 = 0;
            getBestFlags(ctx, accessFlags, usageFlags, createFlags, flags0);

            cl_context ctx_handle = (cl_context)ctx.ptr();
            cl_int retval = 0;
            int tempUMatFlags = UMatData::TEMP_UMAT;
            u->handle = clCreateBuffer(ctx_handle, CL_MEM_USE_HOST_PTR|CL_MEM_READ_WRITE,
                                       u->size, u->origdata, &retval);
            if((!u->handle || retval != CL_SUCCESS) && !(accessFlags & ACCESS_FAST))
            {
                u->handle = clCreateBuffer(ctx_handle, CL_MEM_COPY_HOST_PTR|CL_MEM_READ_WRITE|createFlags,
                                           u->size, u->origdata, &retval);
                tempUMatFlags = UMatData::TEMP_COPIED_UMAT;

            }
            if(!u->handle || retval != CL_SUCCESS)
                return false;
            u->prevAllocator = u->currAllocator;
            u->currAllocator = this;
            u->flags |= tempUMatFlags;
        }
        if(accessFlags & ACCESS_WRITE)
            u->markHostCopyObsolete(true);
        return true;
    }

    /*void sync(UMatData* u) const
    {
        cl_command_queue q = (cl_command_queue)Queue::getDefault().ptr();
        UMatDataAutoLock lock(u);

        if( u->hostCopyObsolete() && u->handle && u->refcount > 0 && u->origdata)
        {
            if( u->tempCopiedUMat() )
            {
                clEnqueueReadBuffer(q, (cl_mem)u->handle, CL_TRUE, 0,
                                    u->size, u->origdata, 0, 0, 0);
            }
            else
            {
                cl_int retval = 0;
                void* data = clEnqueueMapBuffer(q, (cl_mem)u->handle, CL_TRUE,
                                                (CL_MAP_READ | CL_MAP_WRITE),
                                                0, u->size, 0, 0, 0, &retval);
                clEnqueueUnmapMemObject(q, (cl_mem)u->handle, data, 0, 0, 0);
                clFinish(q);
            }
            u->markHostCopyObsolete(false);
        }
        else if( u->copyOnMap() && u->deviceCopyObsolete() && u->data )
        {
            clEnqueueWriteBuffer(q, (cl_mem)u->handle, CL_TRUE, 0,
                                 u->size, u->data, 0, 0, 0);
        }
    }*/

    void deallocate(UMatData* u) const
    {
        if(!u)
            return;

        CV_Assert(u->urefcount >= 0);
        CV_Assert(u->refcount >= 0);

        // TODO: !!! when we add Shared Virtual Memory Support,
        // this function (as well as the others) should be corrected
        CV_Assert(u->handle != 0 && u->urefcount == 0);
        if(u->tempUMat())
        {
//            UMatDataAutoLock lock(u);
            if( u->hostCopyObsolete() && u->refcount > 0 )
            {
                cl_command_queue q = (cl_command_queue)Queue::getDefault().ptr();
                if( u->tempCopiedUMat() )
                {
                    AlignedDataPtr<false, true> alignedPtr(u->origdata, u->size, CV_OPENCL_DATA_PTR_ALIGNMENT);
                    CV_OclDbgAssert(clEnqueueReadBuffer(q, (cl_mem)u->handle, CL_TRUE, 0,
                                        u->size, alignedPtr.getAlignedPtr(), 0, 0, 0) == CL_SUCCESS);
                }
                else
                {
                    cl_int retval = 0;
                    void* data = clEnqueueMapBuffer(q, (cl_mem)u->handle, CL_TRUE,
                                                    (CL_MAP_READ | CL_MAP_WRITE),
                                                    0, u->size, 0, 0, 0, &retval);
                    CV_OclDbgAssert(retval == CL_SUCCESS);
                    CV_OclDbgAssert(clEnqueueUnmapMemObject(q, (cl_mem)u->handle, data, 0, 0, 0) == CL_SUCCESS);
                    CV_OclDbgAssert(clFinish(q) == CL_SUCCESS);
                }
            }
            u->markHostCopyObsolete(false);
            clReleaseMemObject((cl_mem)u->handle);
            u->handle = 0;
            u->currAllocator = u->prevAllocator;
            if(u->data && u->copyOnMap() && !(u->flags & UMatData::USER_ALLOCATED))
                fastFree(u->data);
            u->data = u->origdata;
            if(u->refcount == 0)
                u->currAllocator->deallocate(u);
        }
        else
        {
            CV_Assert(u->refcount == 0);
            if(u->data && u->copyOnMap() && !(u->flags & UMatData::USER_ALLOCATED))
            {
                fastFree(u->data);
                u->data = 0;
            }
            if (u->allocatorFlags_ & ALLOCATOR_FLAGS_BUFFER_POOL_USED)
            {
                bufferPool.release((cl_mem)u->handle, u->capacity);
            }
            else
            {
                clReleaseMemObject((cl_mem)u->handle);
            }
            u->handle = 0;
            u->capacity = 0;
            delete u;
        }
    }

    void map(UMatData* u, int accessFlags) const
    {
        if(!u)
            return;

        CV_Assert( u->handle != 0 );

        UMatDataAutoLock autolock(u);

        if(accessFlags & ACCESS_WRITE)
            u->markDeviceCopyObsolete(true);

        cl_command_queue q = (cl_command_queue)Queue::getDefault().ptr();

        // FIXIT Workaround for UMat synchronization issue
        // if( u->refcount == 0 )
        {
            if( !u->copyOnMap() )
            {
                if (u->data) // FIXIT Workaround for UMat synchronization issue
                {
                    //CV_Assert(u->hostCopyObsolete() == false);
                    return;
                }
                // because there can be other map requests for the same UMat with different access flags,
                // we use the universal (read-write) access mode.
                cl_int retval = 0;
                u->data = (uchar*)clEnqueueMapBuffer(q, (cl_mem)u->handle, CL_TRUE,
                                                     (CL_MAP_READ | CL_MAP_WRITE),
                                                     0, u->size, 0, 0, 0, &retval);
                if(u->data && retval == CL_SUCCESS)
                {
                    u->markHostCopyObsolete(false);
                    u->markDeviceMemMapped(true);
                    return;
                }

                // if map failed, switch to copy-on-map mode for the particular buffer
                u->flags |= UMatData::COPY_ON_MAP;
            }

            if(!u->data)
            {
                u->data = (uchar*)fastMalloc(u->size);
                u->markHostCopyObsolete(true);
            }
        }

        if( (accessFlags & ACCESS_READ) != 0 && u->hostCopyObsolete() )
        {
            AlignedDataPtr<false, true> alignedPtr(u->data, u->size, CV_OPENCL_DATA_PTR_ALIGNMENT);
            CV_Assert( clEnqueueReadBuffer(q, (cl_mem)u->handle, CL_TRUE, 0,
                                           u->size, alignedPtr.getAlignedPtr(), 0, 0, 0) == CL_SUCCESS );
            u->markHostCopyObsolete(false);
        }
    }

    void unmap(UMatData* u) const
    {
        if(!u)
            return;


        CV_Assert(u->handle != 0);

        UMatDataAutoLock autolock(u);

        // FIXIT Workaround for UMat synchronization issue
        if(u->refcount > 0)
            return;

        cl_command_queue q = (cl_command_queue)Queue::getDefault().ptr();
        cl_int retval = 0;
        if( !u->copyOnMap() && u->deviceMemMapped() )
        {
            CV_Assert(u->data != NULL);
            u->markDeviceMemMapped(false);
            CV_Assert( (retval = clEnqueueUnmapMemObject(q,
                                (cl_mem)u->handle, u->data, 0, 0, 0)) == CL_SUCCESS );
            CV_OclDbgAssert(clFinish(q) == CL_SUCCESS);
            u->data = 0;
        }
        else if( u->copyOnMap() && u->deviceCopyObsolete() )
        {
            AlignedDataPtr<true, false> alignedPtr(u->data, u->size, CV_OPENCL_DATA_PTR_ALIGNMENT);
            CV_Assert( (retval = clEnqueueWriteBuffer(q, (cl_mem)u->handle, CL_TRUE, 0,
                                u->size, alignedPtr.getAlignedPtr(), 0, 0, 0)) == CL_SUCCESS );
        }
        u->markDeviceCopyObsolete(false);
        u->markHostCopyObsolete(false);
    }

    bool checkContinuous(int dims, const size_t sz[],
                         const size_t srcofs[], const size_t srcstep[],
                         const size_t dstofs[], const size_t dststep[],
                         size_t& total, size_t new_sz[],
                         size_t& srcrawofs, size_t new_srcofs[], size_t new_srcstep[],
                         size_t& dstrawofs, size_t new_dstofs[], size_t new_dststep[]) const
    {
        bool iscontinuous = true;
        srcrawofs = srcofs ? srcofs[dims-1] : 0;
        dstrawofs = dstofs ? dstofs[dims-1] : 0;
        total = sz[dims-1];
        for( int i = dims-2; i >= 0; i-- )
        {
            if( i >= 0 && (total != srcstep[i] || total != dststep[i]) )
                iscontinuous = false;
            total *= sz[i];
            if( srcofs )
                srcrawofs += srcofs[i]*srcstep[i];
            if( dstofs )
                dstrawofs += dstofs[i]*dststep[i];
        }

        if( !iscontinuous )
        {
            // OpenCL uses {x, y, z} order while OpenCV uses {z, y, x} order.
            if( dims == 2 )
            {
                new_sz[0] = sz[1]; new_sz[1] = sz[0]; new_sz[2] = 1;
                // we assume that new_... arrays are initialized by caller
                // with 0's, so there is no else branch
                if( srcofs )
                {
                    new_srcofs[0] = srcofs[1];
                    new_srcofs[1] = srcofs[0];
                    new_srcofs[2] = 0;
                }

                if( dstofs )
                {
                    new_dstofs[0] = dstofs[1];
                    new_dstofs[1] = dstofs[0];
                    new_dstofs[2] = 0;
                }

                new_srcstep[0] = srcstep[0]; new_srcstep[1] = 0;
                new_dststep[0] = dststep[0]; new_dststep[1] = 0;
            }
            else
            {
                // we could check for dims == 3 here,
                // but from user perspective this one is more informative
                CV_Assert(dims <= 3);
                new_sz[0] = sz[2]; new_sz[1] = sz[1]; new_sz[2] = sz[0];
                if( srcofs )
                {
                    new_srcofs[0] = srcofs[2];
                    new_srcofs[1] = srcofs[1];
                    new_srcofs[2] = srcofs[0];
                }

                if( dstofs )
                {
                    new_dstofs[0] = dstofs[2];
                    new_dstofs[1] = dstofs[1];
                    new_dstofs[2] = dstofs[0];
                }

                new_srcstep[0] = srcstep[1]; new_srcstep[1] = srcstep[0];
                new_dststep[0] = dststep[1]; new_dststep[1] = dststep[0];
            }
        }
        return iscontinuous;
    }

    void download(UMatData* u, void* dstptr, int dims, const size_t sz[],
                  const size_t srcofs[], const size_t srcstep[],
                  const size_t dststep[]) const
    {
        if(!u)
            return;
        UMatDataAutoLock autolock(u);

        if( u->data && !u->hostCopyObsolete() )
        {
            Mat::getStdAllocator()->download(u, dstptr, dims, sz, srcofs, srcstep, dststep);
            return;
        }
        CV_Assert( u->handle != 0 );

        cl_command_queue q = (cl_command_queue)Queue::getDefault().ptr();

        size_t total = 0, new_sz[] = {0, 0, 0};
        size_t srcrawofs = 0, new_srcofs[] = {0, 0, 0}, new_srcstep[] = {0, 0, 0};
        size_t dstrawofs = 0, new_dstofs[] = {0, 0, 0}, new_dststep[] = {0, 0, 0};

        bool iscontinuous = checkContinuous(dims, sz, srcofs, srcstep, 0, dststep,
                                            total, new_sz,
                                            srcrawofs, new_srcofs, new_srcstep,
                                            dstrawofs, new_dstofs, new_dststep);

        AlignedDataPtr<false, true> alignedPtr((uchar*)dstptr, sz[0] * dststep[0], CV_OPENCL_DATA_PTR_ALIGNMENT);
        if( iscontinuous )
        {
            CV_Assert( clEnqueueReadBuffer(q, (cl_mem)u->handle, CL_TRUE,
                                           srcrawofs, total, alignedPtr.getAlignedPtr(), 0, 0, 0) == CL_SUCCESS );
        }
        else
        {
            CV_Assert( clEnqueueReadBufferRect(q, (cl_mem)u->handle, CL_TRUE,
                            new_srcofs, new_dstofs, new_sz, new_srcstep[0], new_srcstep[1],
                            new_dststep[0], new_dststep[1], alignedPtr.getAlignedPtr(), 0, 0, 0) == CL_SUCCESS );
        }
    }

    void upload(UMatData* u, const void* srcptr, int dims, const size_t sz[],
                const size_t dstofs[], const size_t dststep[],
                const size_t srcstep[]) const
    {
        if(!u)
            return;

        // there should be no user-visible CPU copies of the UMat which we are going to copy to
        CV_Assert(u->refcount == 0 || u->tempUMat());

        size_t total = 0, new_sz[] = {0, 0, 0};
        size_t srcrawofs = 0, new_srcofs[] = {0, 0, 0}, new_srcstep[] = {0, 0, 0};
        size_t dstrawofs = 0, new_dstofs[] = {0, 0, 0}, new_dststep[] = {0, 0, 0};

        bool iscontinuous = checkContinuous(dims, sz, 0, srcstep, dstofs, dststep,
                                            total, new_sz,
                                            srcrawofs, new_srcofs, new_srcstep,
                                            dstrawofs, new_dstofs, new_dststep);

        UMatDataAutoLock autolock(u);

        // if there is cached CPU copy of the GPU matrix,
        // we could use it as a destination.
        // we can do it in 2 cases:
        //    1. we overwrite the whole content
        //    2. we overwrite part of the matrix, but the GPU copy is out-of-date
        if( u->data && (u->hostCopyObsolete() < u->deviceCopyObsolete() || total == u->size))
        {
            Mat::getStdAllocator()->upload(u, srcptr, dims, sz, dstofs, dststep, srcstep);
            u->markHostCopyObsolete(false);
            u->markDeviceCopyObsolete(true);
            return;
        }

        CV_Assert( u->handle != 0 );
        cl_command_queue q = (cl_command_queue)Queue::getDefault().ptr();

        AlignedDataPtr<true, false> alignedPtr((uchar*)srcptr, sz[0] * srcstep[0], CV_OPENCL_DATA_PTR_ALIGNMENT);
        if( iscontinuous )
        {
            CV_Assert( clEnqueueWriteBuffer(q, (cl_mem)u->handle,
                CL_TRUE, dstrawofs, total, srcptr, 0, 0, 0) == CL_SUCCESS );
        }
        else
        {
            CV_Assert( clEnqueueWriteBufferRect(q, (cl_mem)u->handle, CL_TRUE,
                new_dstofs, new_srcofs, new_sz, new_dststep[0], new_dststep[1],
                new_srcstep[0], new_srcstep[1], srcptr, 0, 0, 0) == CL_SUCCESS );
        }

        u->markHostCopyObsolete(true);
        u->markDeviceCopyObsolete(false);
    }

    void copy(UMatData* src, UMatData* dst, int dims, const size_t sz[],
              const size_t srcofs[], const size_t srcstep[],
              const size_t dstofs[], const size_t dststep[], bool _sync) const
    {
        if(!src || !dst)
            return;

        size_t total = 0, new_sz[] = {0, 0, 0};
        size_t srcrawofs = 0, new_srcofs[] = {0, 0, 0}, new_srcstep[] = {0, 0, 0};
        size_t dstrawofs = 0, new_dstofs[] = {0, 0, 0}, new_dststep[] = {0, 0, 0};

        bool iscontinuous = checkContinuous(dims, sz, srcofs, srcstep, dstofs, dststep,
                                            total, new_sz,
                                            srcrawofs, new_srcofs, new_srcstep,
                                            dstrawofs, new_dstofs, new_dststep);

        UMatDataAutoLock src_autolock(src);
        UMatDataAutoLock dst_autolock(dst);

        if( !src->handle || (src->data && src->hostCopyObsolete() < src->deviceCopyObsolete()) )
        {
            upload(dst, src->data + srcrawofs, dims, sz, dstofs, dststep, srcstep);
            return;
        }
        if( !dst->handle || (dst->data && dst->hostCopyObsolete() < dst->deviceCopyObsolete()) )
        {
            download(src, dst->data + dstrawofs, dims, sz, srcofs, srcstep, dststep);
            dst->markHostCopyObsolete(false);
            dst->markDeviceCopyObsolete(true);
            return;
        }

        // there should be no user-visible CPU copies of the UMat which we are going to copy to
        CV_Assert(dst->refcount == 0);
        cl_command_queue q = (cl_command_queue)Queue::getDefault().ptr();

        if( iscontinuous )
        {
            CV_Assert( clEnqueueCopyBuffer(q, (cl_mem)src->handle, (cl_mem)dst->handle,
                                           srcrawofs, dstrawofs, total, 0, 0, 0) == CL_SUCCESS );
        }
        else
        {
            cl_int retval;
            CV_Assert( (retval = clEnqueueCopyBufferRect(q, (cl_mem)src->handle, (cl_mem)dst->handle,
                                               new_srcofs, new_dstofs, new_sz,
                                               new_srcstep[0], new_srcstep[1],
                                               new_dststep[0], new_dststep[1],
                                               0, 0, 0)) == CL_SUCCESS );
        }

        dst->markHostCopyObsolete(true);
        dst->markDeviceCopyObsolete(false);

        if( _sync )
        {
            CV_OclDbgAssert(clFinish(q) == CL_SUCCESS);
        }
    }

    BufferPoolController* getBufferPoolController() const { return &bufferPool; }

    MatAllocator* matStdAllocator;
};

MatAllocator* getOpenCLAllocator()
{
    static MatAllocator * allocator = new OpenCLAllocator();
    return allocator;
}

///////////////////////////////////////////// Utility functions /////////////////////////////////////////////////

static void getDevices(std::vector<cl_device_id>& devices, cl_platform_id platform)
{
    cl_uint numDevices = 0;
    CV_OclDbgAssert(clGetDeviceIDs(platform, (cl_device_type)Device::TYPE_ALL,
                                0, NULL, &numDevices) == CL_SUCCESS);

    if (numDevices == 0)
    {
        devices.clear();
        return;
    }

    devices.resize((size_t)numDevices);
    CV_OclDbgAssert(clGetDeviceIDs(platform, (cl_device_type)Device::TYPE_ALL,
                                numDevices, &devices[0], &numDevices) == CL_SUCCESS);
}

struct PlatformInfo::Impl
{
    Impl(void* id)
    {
        refcount = 1;
        handle = *(cl_platform_id*)id;
        getDevices(devices, handle);
    }

    String getStrProp(cl_device_info prop) const
    {
        char buf[1024];
        size_t sz=0;
        return clGetPlatformInfo(handle, prop, sizeof(buf)-16, buf, &sz) == CL_SUCCESS &&
            sz < sizeof(buf) ? String(buf) : String();
    }

    IMPLEMENT_REFCOUNTABLE();
    std::vector<cl_device_id> devices;
    cl_platform_id handle;
};

PlatformInfo::PlatformInfo()
{
    p = 0;
}

PlatformInfo::PlatformInfo(void* platform_id)
{
    p = new Impl(platform_id);
}

PlatformInfo::~PlatformInfo()
{
    if(p)
        p->release();
}

PlatformInfo::PlatformInfo(const PlatformInfo& i)
{
    if (i.p)
        i.p->addref();
    p = i.p;
}

PlatformInfo& PlatformInfo::operator =(const PlatformInfo& i)
{
    if (i.p != p)
    {
        if (i.p)
            i.p->addref();
        if (p)
            p->release();
        p = i.p;
    }
    return *this;
}

int PlatformInfo::deviceNumber() const
{
    return p ? (int)p->devices.size() : 0;
}

void PlatformInfo::getDevice(Device& device, int d) const
{
    CV_Assert(p && d < (int)p->devices.size() );
    if(p)
        device.set(p->devices[d]);
}

String PlatformInfo::name() const
{
    return p ? p->getStrProp(CL_PLATFORM_NAME) : String();
}

String PlatformInfo::vendor() const
{
    return p ? p->getStrProp(CL_PLATFORM_VENDOR) : String();
}

String PlatformInfo::version() const
{
    return p ? p->getStrProp(CL_PLATFORM_VERSION) : String();
}

static void getPlatforms(std::vector<cl_platform_id>& platforms)
{
    cl_uint numPlatforms = 0;
    CV_OclDbgAssert(clGetPlatformIDs(0, NULL, &numPlatforms) == CL_SUCCESS);

    if (numPlatforms == 0)
    {
        platforms.clear();
        return;
    }

    platforms.resize((size_t)numPlatforms);
    CV_OclDbgAssert(clGetPlatformIDs(numPlatforms, &platforms[0], &numPlatforms) == CL_SUCCESS);
}

void getPlatfomsInfo(std::vector<PlatformInfo>& platformsInfo)
{
    std::vector<cl_platform_id> platforms;
    getPlatforms(platforms);

    for (size_t i = 0; i < platforms.size(); i++)
        platformsInfo.push_back( PlatformInfo((void*)&platforms[i]) );
}

const char* typeToStr(int type)
{
    static const char* tab[]=
    {
        "uchar", "uchar2", "uchar3", "uchar4", 0, 0, 0, "uchar8", 0, 0, 0, 0, 0, 0, 0, "uchar16",
        "char", "char2", "char3", "char4", 0, 0, 0, "char8", 0, 0, 0, 0, 0, 0, 0, "char16",
        "ushort", "ushort2", "ushort3", "ushort4",0, 0, 0, "ushort8", 0, 0, 0, 0, 0, 0, 0, "ushort16",
        "short", "short2", "short3", "short4", 0, 0, 0, "short8", 0, 0, 0, 0, 0, 0, 0, "short16",
        "int", "int2", "int3", "int4", 0, 0, 0, "int8", 0, 0, 0, 0, 0, 0, 0, "int16",
        "float", "float2", "float3", "float4", 0, 0, 0, "float8", 0, 0, 0, 0, 0, 0, 0, "float16",
        "double", "double2", "double3", "double4", 0, 0, 0, "double8", 0, 0, 0, 0, 0, 0, 0, "double16",
        "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?"
    };
    int cn = CV_MAT_CN(type), depth = CV_MAT_DEPTH(type);
    return cn > 16 ? "?" : tab[depth*16 + cn-1];
}

const char* memopTypeToStr(int type)
{
    static const char* tab[] =
    {
        "uchar", "uchar2", "uchar3", "uchar4", 0, 0, 0, "uchar8", 0, 0, 0, 0, 0, 0, 0, "uchar16",
        "char", "char2", "char3", "char4", 0, 0, 0, "char8", 0, 0, 0, 0, 0, 0, 0, "char16",
        "ushort", "ushort2", "ushort3", "ushort4",0, 0, 0, "ushort8", 0, 0, 0, 0, 0, 0, 0, "ushort16",
        "short", "short2", "short3", "short4", 0, 0, 0, "short8", 0, 0, 0, 0, 0, 0, 0, "short16",
        "int", "int2", "int3", "int4", 0, 0, 0, "int8", 0, 0, 0, 0, 0, 0, 0, "int16",
        "int", "int2", "int3", "int4", 0, 0, 0, "int8", 0, 0, 0, 0, 0, 0, 0, "int16",
        "ulong", "ulong2", "ulong3", "ulong4", 0, 0, 0, "ulong8", 0, 0, 0, 0, 0, 0, 0, "ulong16",
        "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?", "?"
    };
    int cn = CV_MAT_CN(type), depth = CV_MAT_DEPTH(type);
    return cn > 16 ? "?" : tab[depth*16 + cn-1];
}

const char* convertTypeStr(int sdepth, int ddepth, int cn, char* buf)
{
    if( sdepth == ddepth )
        return "noconvert";
    const char *typestr = typeToStr(CV_MAKETYPE(ddepth, cn));
    if( ddepth >= CV_32F ||
        (ddepth == CV_32S && sdepth < CV_32S) ||
        (ddepth == CV_16S && sdepth <= CV_8S) ||
        (ddepth == CV_16U && sdepth == CV_8U))
    {
        sprintf(buf, "convert_%s", typestr);
    }
    else if( sdepth >= CV_32F )
        sprintf(buf, "convert_%s%s_rte", typestr, (ddepth < CV_32S ? "_sat" : ""));
    else
        sprintf(buf, "convert_%s_sat", typestr);

    return buf;
}

template <typename T>
static std::string kerToStr(const Mat & k)
{
    int width = k.cols - 1, depth = k.depth();
    const T * const data = reinterpret_cast<const T *>(k.data);

    std::ostringstream stream;
    stream.precision(10);

    if (depth <= CV_8S)
    {
        for (int i = 0; i < width; ++i)
            stream << "DIG(" << (int)data[i] << ")";
        stream << "DIG(" << (int)data[width] << ")";
    }
    else if (depth == CV_32F)
    {
        stream.setf(std::ios_base::showpoint);
        for (int i = 0; i < width; ++i)
            stream << "DIG(" << data[i] << "f)";
        stream << "DIG(" << data[width] << "f)";
    }
    else
    {
        for (int i = 0; i < width; ++i)
            stream << "DIG(" << data[i] << ")";
        stream << "DIG(" << data[width] << ")";
    }

    return stream.str();
}

String kernelToStr(InputArray _kernel, int ddepth, const char * name)
{
    Mat kernel = _kernel.getMat().reshape(1, 1);

    int depth = kernel.depth();
    if (ddepth < 0)
        ddepth = depth;

    if (ddepth != depth)
        kernel.convertTo(kernel, ddepth);

    typedef std::string (* func_t)(const Mat &);
    static const func_t funcs[] = { kerToStr<uchar>, kerToStr<char>, kerToStr<ushort>, kerToStr<short>,
                                    kerToStr<int>, kerToStr<float>, kerToStr<double>, 0 };
    const func_t func = funcs[ddepth];
    CV_Assert(func != 0);

    return cv::format(" -D %s=%s", name ? name : "COEFF", func(kernel).c_str());
}

#define PROCESS_SRC(src) \
    do \
    { \
        if (!src.empty()) \
        { \
            CV_Assert(src.isMat() || src.isUMat()); \
            int ctype = src.type(), ccn = CV_MAT_CN(ctype); \
            Size csize = src.size(); \
            cols.push_back(ccn * csize.width); \
            if (ctype != type) \
                return 1; \
            offsets.push_back(src.offset()); \
            steps.push_back(src.step()); \
        } \
    } \
    while ((void)0, 0)

int predictOptimalVectorWidth(InputArray src1, InputArray src2, InputArray src3,
                              InputArray src4, InputArray src5, InputArray src6,
                              InputArray src7, InputArray src8, InputArray src9)
{
    int type = src1.type(), depth = CV_MAT_DEPTH(type), cn = CV_MAT_CN(type), esz1 = CV_ELEM_SIZE1(depth);
    Size ssize = src1.size();
    const ocl::Device & d = ocl::Device::getDefault();

    int vectorWidths[] = { d.preferredVectorWidthChar(), d.preferredVectorWidthChar(),
        d.preferredVectorWidthShort(), d.preferredVectorWidthShort(),
        d.preferredVectorWidthInt(), d.preferredVectorWidthFloat(),
        d.preferredVectorWidthDouble(), -1 }, kercn = vectorWidths[depth];

    // if the device says don't use vectors
    if (vectorWidths[0] == 1)
    {
        // it's heuristic
        int vectorWidthsOthers[] = { 16, 16, 8, 8, 1, 1, 1, -1 };
        kercn = vectorWidthsOthers[depth];
    }

    if (ssize.width * cn < kercn || kercn <= 0)
        return 1;

    std::vector<size_t> offsets, steps, cols;
    PROCESS_SRC(src1);
    PROCESS_SRC(src2);
    PROCESS_SRC(src3);
    PROCESS_SRC(src4);
    PROCESS_SRC(src5);
    PROCESS_SRC(src6);
    PROCESS_SRC(src7);
    PROCESS_SRC(src8);
    PROCESS_SRC(src9);

    size_t size = offsets.size();
    int wsz = kercn * esz1;
    std::vector<int> dividers(size, wsz);

    for (size_t i = 0; i < size; ++i)
        while (offsets[i] % dividers[i] != 0 || steps[i] % dividers[i] != 0 || cols[i] % dividers[i] != 0)
            dividers[i] >>= 1;

    // default strategy
    for (size_t i = 0; i < size; ++i)
        if (dividers[i] != wsz)
        {
            kercn = 1;
            break;
        }

    // another strategy
//    width = *std::min_element(dividers.begin(), dividers.end());

    return kercn;
}

#undef PROCESS_SRC


// TODO Make this as a method of OpenCL "BuildOptions" class
void buildOptionsAddMatrixDescription(String& buildOptions, const String& name, InputArray _m)
{
    if (!buildOptions.empty())
        buildOptions += " ";
    int type = _m.type(), depth = CV_MAT_DEPTH(type);
    buildOptions += format(
            "-D %s_T=%s -D %s_T1=%s -D %s_CN=%d -D %s_TSIZE=%d -D %s_T1SIZE=%d -D %s_DEPTH=%d",
            name.c_str(), ocl::typeToStr(type),
            name.c_str(), ocl::typeToStr(CV_MAKE_TYPE(depth, 1)),
            name.c_str(), (int)CV_MAT_CN(type),
            name.c_str(), (int)CV_ELEM_SIZE(type),
            name.c_str(), (int)CV_ELEM_SIZE1(type),
            name.c_str(), (int)depth
            );
}


struct Image2D::Impl
{
    Impl(const UMat &src, bool norm, bool alias)
    {
        handle = 0;
        refcount = 1;
        init(src, norm, alias);
    }

    ~Impl()
    {
        if (handle)
            clReleaseMemObject(handle);
    }

    static cl_image_format getImageFormat(int depth, int cn, bool norm)
    {
        cl_image_format format;
        static const int channelTypes[] = { CL_UNSIGNED_INT8, CL_SIGNED_INT8, CL_UNSIGNED_INT16,
                                       CL_SIGNED_INT16, CL_SIGNED_INT32, CL_FLOAT, -1, -1 };
        static const int channelTypesNorm[] = { CL_UNORM_INT8, CL_SNORM_INT8, CL_UNORM_INT16,
                                                CL_SNORM_INT16, -1, -1, -1, -1 };
        static const int channelOrders[] = { -1, CL_R, CL_RG, -1, CL_RGBA };

        int channelType = norm ? channelTypesNorm[depth] : channelTypes[depth];
        int channelOrder = channelOrders[cn];
        format.image_channel_data_type = (cl_channel_type)channelType;
        format.image_channel_order = (cl_channel_order)channelOrder;
        return format;
    }

    static bool isFormatSupported(cl_image_format format)
    {
        cl_context context = (cl_context)Context::getDefault().ptr();
        // Figure out how many formats are supported by this context.
        cl_uint numFormats = 0;
        cl_int err = clGetSupportedImageFormats(context, CL_MEM_READ_WRITE,
                                                CL_MEM_OBJECT_IMAGE2D, numFormats,
                                                NULL, &numFormats);
        AutoBuffer<cl_image_format> formats(numFormats);
        err = clGetSupportedImageFormats(context, CL_MEM_READ_WRITE,
                                         CL_MEM_OBJECT_IMAGE2D, numFormats,
                                         formats, NULL);
        CV_OclDbgAssert(err == CL_SUCCESS);
        for (cl_uint i = 0; i < numFormats; ++i)
        {
            if (!memcmp(&formats[i], &format, sizeof(format)))
            {
                return true;
            }
        }
        return false;
    }

    void init(const UMat &src, bool norm, bool alias)
    {
        CV_Assert(ocl::Device::getDefault().imageSupport());

        int err, depth = src.depth(), cn = src.channels();
        CV_Assert(cn <= 4);
        cl_image_format format = getImageFormat(depth, cn, norm);

        if (!isFormatSupported(format))
            CV_Error(Error::OpenCLApiCallError, "Image format is not supported");

        cl_context context = (cl_context)Context::getDefault().ptr();
        cl_command_queue queue = (cl_command_queue)Queue::getDefault().ptr();

#ifdef CL_VERSION_1_2
        // this enables backwards portability to
        // run on OpenCL 1.1 platform if library binaries are compiled with OpenCL 1.2 support
        const Device & d = ocl::Device::getDefault();
        int minor = d.deviceVersionMinor(), major = d.deviceVersionMajor();
        CV_Assert(!alias || canCreateAlias(src));
        if (1 < major || (1 == major && 2 <= minor))
        {
            cl_image_desc desc;
            desc.image_type       = CL_MEM_OBJECT_IMAGE2D;
            desc.image_width      = src.cols;
            desc.image_height     = src.rows;
            desc.image_depth      = 0;
            desc.image_array_size = 1;
            desc.image_row_pitch  = alias ? src.step[0] : 0;
            desc.image_slice_pitch = 0;
            desc.buffer           = alias ? (cl_mem)src.handle(ACCESS_RW) : 0;
            desc.num_mip_levels   = 0;
            desc.num_samples      = 0;
            handle = clCreateImage(context, CL_MEM_READ_WRITE, &format, &desc, NULL, &err);
        }
        else
#endif
        {
            CV_SUPPRESS_DEPRECATED_START
            CV_Assert(!alias);  // This is an OpenCL 1.2 extension
            handle = clCreateImage2D(context, CL_MEM_READ_WRITE, &format, src.cols, src.rows, 0, NULL, &err);
            CV_SUPPRESS_DEPRECATED_END
        }
        CV_OclDbgAssert(err == CL_SUCCESS);

        size_t origin[] = { 0, 0, 0 };
        size_t region[] = { static_cast<size_t>(src.cols), static_cast<size_t>(src.rows), 1 };

        cl_mem devData;
        if (!alias && !src.isContinuous())
        {
            devData = clCreateBuffer(context, CL_MEM_READ_ONLY, src.cols * src.rows * src.elemSize(), NULL, &err);
            CV_OclDbgAssert(err == CL_SUCCESS);

            const size_t roi[3] = {static_cast<size_t>(src.cols) * src.elemSize(), static_cast<size_t>(src.rows), 1};
            CV_Assert(clEnqueueCopyBufferRect(queue, (cl_mem)src.handle(ACCESS_READ), devData, origin, origin,
                roi, src.step, 0, src.cols * src.elemSize(), 0, 0, NULL, NULL) == CL_SUCCESS);
            CV_OclDbgAssert(clFlush(queue) == CL_SUCCESS);
        }
        else
        {
            devData = (cl_mem)src.handle(ACCESS_READ);
        }
        CV_Assert(devData != NULL);

        if (!alias)
        {
            CV_OclDbgAssert(clEnqueueCopyBufferToImage(queue, devData, handle, 0, origin, region, 0, NULL, 0) == CL_SUCCESS);
            if (!src.isContinuous())
            {
                CV_OclDbgAssert(clFlush(queue) == CL_SUCCESS);
                CV_OclDbgAssert(clReleaseMemObject(devData) == CL_SUCCESS);
            }
        }
    }

    IMPLEMENT_REFCOUNTABLE();

    cl_mem handle;
};

Image2D::Image2D()
{
    p = NULL;
}

Image2D::Image2D(const UMat &src, bool norm, bool alias)
{
    p = new Impl(src, norm, alias);
}

bool Image2D::canCreateAlias(const UMat &m)
{
    bool ret = false;
    const Device & d = ocl::Device::getDefault();
    if (d.imageFromBufferSupport())
    {
        // This is the required pitch alignment in pixels
        uint pitchAlign = d.imagePitchAlignment();
        if (pitchAlign && !(m.step % (pitchAlign * m.elemSize())))
        {
            // We don't currently handle the case where the buffer was created
            // with CL_MEM_USE_HOST_PTR
            if (!m.u->tempUMat())
            {
                ret = true;
            }
        }
    }
    return ret;
}

bool Image2D::isFormatSupported(int depth, int cn, bool norm)
{
    cl_image_format format = Impl::getImageFormat(depth, cn, norm);

    return Impl::isFormatSupported(format);
}

Image2D::Image2D(const Image2D & i)
{
    p = i.p;
    if (p)
        p->addref();
}

Image2D & Image2D::operator = (const Image2D & i)
{
    if (i.p != p)
    {
        if (i.p)
            i.p->addref();
        if (p)
            p->release();
        p = i.p;
    }
    return *this;
}

Image2D::~Image2D()
{
    if (p)
        p->release();
}

void* Image2D::ptr() const
{
    return p ? p->handle : 0;
}

bool isPerformanceCheckBypassed()
{
    static bool initialized = false;
    static bool value = false;
    if (!initialized)
    {
        value = getBoolParameter("OPENCV_OPENCL_PERF_CHECK_BYPASS", false);
        initialized = true;
    }
    return value;
}

}}