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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"

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

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 TextureBinder
        {
        public:
            TextureBinder() : tex_(0) {}
            template <typename T> TextureBinder(const textureReference* tex, const DevMem2D_<T>& img) : tex_(0)
            {
                bind(tex, img);
            }
            template <typename T> TextureBinder(const char* tex_name, const DevMem2D_<T>& img) : tex_(0)
            {
                bind(tex_name, img);
            }
            ~TextureBinder() { unbind(); }

            template <typename T> void bind(const textureReference* tex, const DevMem2D_<T>& img)
            {
                unbind();

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

                tex_ = tex;
            }
            template <typename T> void bind(const char* tex_name, const DevMem2D_<T>& img)
            {
                const textureReference* tex; 
                cudaSafeCall( cudaGetTextureReference(&tex, tex_name) ); 
                bind(tex, img);
            }

            void unbind()
            {
                if (tex_)
                {
                    cudaUnbindTexture(tex_);
                    tex_ = 0;
                }
            }

        private:
            const textureReference* 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__ */