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#ifndef __OPENCV_GPU_COMMON_HPP__
#define __OPENCV_GPU_COMMON_HPP__

#include <cuda_runtime.h>
#include "opencv2/core/cuda_devptrs.hpp"

#ifndef CV_PI
    #define CV_PI   3.1415926535897932384626433832795
#endif

#ifndef CV_PI_F
    #ifndef CV_PI
        #define CV_PI_F 3.14159265f
    #else
        #define CV_PI_F ((float)CV_PI)
    #endif
#endif

#if defined(__GNUC__)
    #define cudaSafeCall(expr)  ___cudaSafeCall(expr, __FILE__, __LINE__, __func__)
#else /* defined(__CUDACC__) || defined(__MSVC__) */
    #define cudaSafeCall(expr)  ___cudaSafeCall(expr, __FILE__, __LINE__)
#endif

namespace cv { namespace gpu
{
    void error(const char *error_string, const char *file, const int line, const char *func);

    template <typename T> static inline bool isAligned(const T* ptr, size_t size)
    {
        return reinterpret_cast<size_t>(ptr) % size == 0;
    }

    static inline bool isAligned(size_t step, size_t size)
    {
        return step % size == 0;
    }
}}

static inline void ___cudaSafeCall(cudaError_t err, const char *file, const int line, const char *func = "")
{
    if (cudaSuccess != err)
        cv::gpu::error(cudaGetErrorString(err), file, line, func);
}

namespace cv { namespace gpu
{
    __host__ __device__ __forceinline__ int divUp(int total, int grain)
    {
        return (total + grain - 1) / grain;
    }

    namespace device
    {
        using cv::gpu::divUp;

#ifdef __CUDACC__
        typedef unsigned char uchar;
        typedef unsigned short ushort;
        typedef signed char schar;
        #if defined (_WIN32) || defined (__APPLE__)
            typedef unsigned int uint;
        #endif

        template<class T> inline void bindTexture(const textureReference* tex, const PtrStepSz<T>& img)
        {
            cudaChannelFormatDesc desc = cudaCreateChannelDesc<T>();
            cudaSafeCall( cudaBindTexture2D(0, tex, img.ptr(), &desc, img.cols, img.rows, img.step) );
        }
#endif // __CUDACC__
    }
}}



#endif // __OPENCV_GPU_COMMON_HPP__
