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#ifndef __OPENCV_internal_shared_HPP__
#define __OPENCV_internal_shared_HPP__

#include "opencv2/gpu/devmem2d.hpp"
#include "safe_call.hpp"
#include "cuda_runtime.h"
#include "npp.h"
#include "NPP_staging.hpp"

namespace cv
{
    namespace gpu
    {
        typedef unsigned char uchar;
        typedef signed char schar;
        typedef unsigned short ushort;
        typedef unsigned int uint;       

        enum 
        {
            BORDER_REFLECT101_GPU = 0,
            BORDER_REPLICATE_GPU,
            BORDER_CONSTANT_GPU
        };
                
        // Converts CPU border extrapolation mode into GPU internal analogue.
        // Returns true if the GPU analogue exists, false otherwise.
        bool tryConvertToGpuBorderType(int cpuBorderType, int& gpuBorderType);


        static inline int divUp(int total, int grain) { return (total + grain - 1) / grain; }

        template<class T> static inline void uploadConstant(const char* name, const T& value) 
        { 
            cudaSafeCall( cudaMemcpyToSymbol(name, &value, sizeof(T)) ); 
        }

        template<class T> static inline void uploadConstant(const char* name, const T& value, cudaStream_t stream) 
        {
            cudaSafeCall( cudaMemcpyToSymbolAsync(name, &value, sizeof(T), 0, cudaMemcpyHostToDevice, stream) ); 
        }        

        template<class T> static inline void bindTexture(const char* name, const DevMem2D_<T>& img/*, bool normalized = false,
            enum cudaTextureFilterMode filterMode = cudaFilterModePoint, enum cudaTextureAddressMode addrMode = cudaAddressModeClamp*/)
        {            
            //!!!! const_cast is disabled!
            //!!!! Please use constructor of 'class texture'  instead.

            //textureReference* tex; 
            //cudaSafeCall( cudaGetTextureReference((const textureReference**)&tex, name) ); 
            //tex->normalized = normalized;
            //tex->filterMode = filterMode;
            //tex->addressMode[0] = addrMode;
            //tex->addressMode[1] = addrMode;
            
            const textureReference* tex; 
            cudaSafeCall( cudaGetTextureReference(&tex, name) ); 

            cudaChannelFormatDesc desc = cudaCreateChannelDesc<T>();
            cudaSafeCall( cudaBindTexture2D(0, tex, img.ptr(), &desc, img.cols, img.rows, img.step) );
        }

        static inline void unbindTexture(const char *name)
        {
            const textureReference* tex; 
            cudaSafeCall( cudaGetTextureReference(&tex, name) ); 
            cudaSafeCall( cudaUnbindTexture(tex) );
        }

        class NppStreamHandler
        {
        public:
            inline explicit NppStreamHandler(cudaStream_t newStream = 0)
            {
                oldStream = nppGetStream();
                nppSetStream(newStream);
            }

            inline ~NppStreamHandler()
            {
                nppSetStream(oldStream);
            }

        private:
            cudaStream_t oldStream;
        };

        class NppStStreamHandler
        {
        public:
            inline explicit NppStStreamHandler(cudaStream_t newStream = 0)
            {
                oldStream = nppStSetActiveCUDAstream(newStream);
            }

            inline ~NppStStreamHandler()
            {
                nppStSetActiveCUDAstream(oldStream);
            }

        private:
            cudaStream_t oldStream;
        };
    }
}


#endif /* __OPENCV_internal_shared_HPP__ */
