/*M///////////////////////////////////////////////////////////////////////////////////////
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//  If you do not agree to this license, do not download, install,
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//
//                           License Agreement
//                For Open Source Computer Vision Library
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// Copyright (C) 2010-2013, Advanced Micro Devices, Inc., all rights reserved.
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// Redistribution and use in source and binary forms, with or without modification,
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#ifndef __OPENCV_OCL_PRIVATE_OPENCL_UTILS_HPP__
#define __OPENCV_OCL_PRIVATE_OPENCL_UTILS_HPP__

#include "opencv2/ocl/cl_runtime/cl_runtime.hpp"
#include <vector>
#include <string>

namespace cl_utils {

inline cl_int getPlatforms(std::vector<cl_platform_id>& platforms)
{
    cl_uint n = 0;

    cl_int err = ::clGetPlatformIDs(0, NULL, &n);
    if (err != CL_SUCCESS)
        return err;

    platforms.clear(); platforms.resize(n);
    err = ::clGetPlatformIDs(n, &platforms[0], NULL);
    if (err != CL_SUCCESS)
        return err;

    return CL_SUCCESS;
}

inline cl_int getDevices(cl_platform_id platform, cl_device_type type, std::vector<cl_device_id>& devices)
{
    cl_uint n = 0;

    cl_int err = ::clGetDeviceIDs(platform, type, 0, NULL, &n);
    if (err != CL_SUCCESS)
        return err;

    devices.clear(); devices.resize(n);
    err = ::clGetDeviceIDs(platform, type, n, &devices[0], NULL);
    if (err != CL_SUCCESS)
        return err;

    return CL_SUCCESS;
}




template <typename Functor, typename ObjectType, typename T>
inline cl_int getScalarInfo(Functor f, ObjectType obj, cl_uint name, T& param)
{
    return f(obj, name, sizeof(T), &param, NULL);
}

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)
    {
        std::vector<char> buf(required + 1, char(0));
        err = f(obj, name, required, &buf[0], NULL);
        if (err != CL_SUCCESS)
            return err;
        param = &buf[0];
    }

    return CL_SUCCESS;
};

} // namespace cl_utils

#endif // __OPENCV_OCL_PRIVATE_OPENCL_UTILS_HPP__
