ophRec_GPU.h

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#pragma once
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//#ifndef __ophRec_GPU_h
//#define __ophRec_GPU_h

#include "ophRec.h"
#include <cuda_runtime_api.h>
#include <cufft.h>

#define __CUDA_INTERNAL_COMPILATION__ //for CUDA Math Module
#include <math_constants.h>
//#include <math_functions_dbl_ptx3.h> //Double Precision Floating
#include <vector_functions.h> //Vector Processing Function
#undef __CUDA_INTERNAL_COMPILATION__

static void HandleError(cudaError_t err,
    const char *file,
    int line) {
    if (err != cudaSuccess) {
        printf("%s in %s at line %d\n", cudaGetErrorString(err),
            file, line);
        exit(EXIT_FAILURE);
    }
}
#define HANDLE_ERROR( err ) (HandleError( err, __FILE__, __LINE__ ))


#define HANDLE_NULL( a ) {if (a == NULL) { \
                            printf( "Host memory failed in %s at line %d\n", \
                                    __FILE__, __LINE__ ); \
                            exit( EXIT_FAILURE );}} 

typedef struct KernelConst {
    int channel;    
    int n_streams;  

    Real distance;

    int pnX;        
    int pnY;        

    double ppX; 
    double ppY; 

    double k;         
    double lambda;    

    bool bRandomPhase;  // use random phase
    double pi2;

    double tx;
    double ty;
    double dx;
    double dy;
    double htx;
    double hty;
    double hdx;
    double hdy;

    double baseX;
    double baseY;

    KernelConst(
        const int &channel,     
        const int &n_streams,
        const int &pnX, 
        const int &pnY, 
        const Real &ppX,    
        const Real &ppY,    
        const Real &propagation_distance, 
        const Real &k,              
        const Real &lambda,        
        const bool &random_phase
    )
    {
        this->channel = channel;
        this->n_streams = n_streams;
        this->lambda = lambda;

        // Output Image Size
        this->pnX = pnX;
        this->pnY = pnY;

        // Pixel pitch at eyepiece lens plane (by simple magnification) ==> SLM pitch
        this->ppX = ppX;
        this->ppY = ppY;

        // WRP 
        this->distance = propagation_distance;

        // Wave Number
        this->k = k;

        this->lambda = lambda;

        // Random Phase
        this->bRandomPhase = random_phase;
        
        this->pi2 = M_PI * 2;

        tx = 1 / ppX;
        ty = 1 / ppY;
        dx = tx / pnX;
        dy = ty / pnY;

        htx = tx / 2;
        hty = ty / 2;
        hdx = dx / 2;
        hdy = dy / 2;
        baseX = -htx + hdx;
        baseY = -hty + hdy;

    }
} RecGpuConst;


extern "C"
{
    void cudaASMPropagation(
        const int &nBlocks, const int &nThreads, const int &nx, const int &ny,
        cuDoubleComplex *src, cuDoubleComplex *dst, Real *encode, const RecGpuConst* cuda_config);
}