ophWRP.cpp

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#include "ophWRP.h"
#include "sys.h"
#include "tinyxml2.h"

ophWRP::ophWRP(void)
    : ophGen()
    , scaledVertex(nullptr)
    , m_nProgress(0)
    , zmax_(0.0)
{
    n_points = -1;
    p_wrp_ = nullptr;
    is_ViewingWindow = false;
    LOG("*** WRP : BUILD DATE: %s %s ***\n\n", __DATE__, __TIME__);
}

ophWRP::~ophWRP(void)
{
}

void ophWRP::setViewingWindow(bool is_ViewingWindow)
{
    this->is_ViewingWindow = is_ViewingWindow;
}

void ophWRP::autoScaling()
{
    LOG("%s : ", __FUNCTION__);
    auto begin = CUR_TIME;

    const uint pnX = context_.pixel_number[_X];
    const uint pnY = context_.pixel_number[_Y];
    const Real ppX = context_.pixel_pitch[_X];
    const Real ppY = context_.pixel_pitch[_Y];

    Real size = pnY * ppY * 0.8 / 2.0;

    if (scaledVertex) {
        delete[] scaledVertex;
        scaledVertex = nullptr;
    }
    scaledVertex = new Vertex[n_points];

    std::memcpy(scaledVertex, obj_.vertices, sizeof(Vertex) * n_points);

    vec3 scale = wrp_config_.scale;

#if 1
    zmax_ = MIN_DOUBLE;
    for (int i = 0; i < n_points; i++)
    {
        scaledVertex[i].point.pos[_X] = scaledVertex[i].point.pos[_X] * scale[_X];
        scaledVertex[i].point.pos[_Y] = scaledVertex[i].point.pos[_Y] * scale[_Y];
        scaledVertex[i].point.pos[_Z] = scaledVertex[i].point.pos[_Z] * scale[_Z];

        if (zmax_ < scaledVertex[i].point.pos[_Z]) zmax_ = scaledVertex[i].point.pos[_Z];
    }
#else

    Real x_max, y_max, z_max;
    x_max = y_max = z_max = MIN_DOUBLE;

    for (int i = 0; i < n_points; i++)
    {
        if (x_max < scaledVertex[i].point.pos[_X]) x_max = scaledVertex[i].point.pos[_X];
        if (y_max < scaledVertex[i].point.pos[_Y]) y_max = scaledVertex[i].point.pos[_Y];
        if (z_max < scaledVertex[i].point.pos[_Z]) z_max = scaledVertex[i].point.pos[_Z];
    }

    Real maxXY = (x_max > y_max) ? x_max : y_max;
    zmax_ = MIN_DOUBLE;
    for (int j = 0; j < n_points; ++j)
    { //Create Fringe Pattern
        scaledVertex[j].point.pos[_X] = scaledVertex[j].point.pos[_X] / maxXY * size;
        scaledVertex[j].point.pos[_Y] = scaledVertex[j].point.pos[_Y] / maxXY * size;
        scaledVertex[j].point.pos[_Z] = scaledVertex[j].point.pos[_Z] / z_max * size;

        if (zmax_ < scaledVertex[j].point.pos[_Z]) zmax_ = scaledVertex[j].point.pos[_Z];
    }

#endif
    LOG("%lf (s)\n", ELAPSED_TIME(begin, CUR_TIME));
}

int ophWRP::loadPointCloud(const char* pc_file)
{
    n_points = ophGen::loadPointCloud(pc_file, &obj_);

    return n_points;

}

bool ophWRP::readConfig(const char* fname)
{
    if (!ophGen::readConfig(fname))
        return false;

    bool bRet = true;
    using namespace tinyxml2;
    /*XML parsing*/
    tinyxml2::XMLDocument xml_doc;
    XMLNode* xml_node;

    if (!checkExtension(fname, ".xml"))
    {
        LOG("<FAILED> Wrong file ext.\n");
        return false;
    }
    if (xml_doc.LoadFile(fname) != XML_SUCCESS)
    {
        LOG("<FAILED> Loading file.\n");
        return false;
    }
    xml_node = xml_doc.FirstChild();

    char szNodeName[32] = { 0, };
    // about viewing window
    sprintf(szNodeName, "FieldLength");
    auto next = xml_node->FirstChildElement(szNodeName);
    if (!next || XML_SUCCESS != next->QueryDoubleText(&wrp_config_.fieldLength))
    {
        LOG("<FAILED> Not found node : \'%s\' (Double) \n", szNodeName);
        bRet = false;
    }
    // about point
    sprintf(szNodeName, "ScaleX");
    next = xml_node->FirstChildElement(szNodeName);
    if (!next || XML_SUCCESS != next->QueryDoubleText(&wrp_config_.scale[_X]))
    {
        LOG("<FAILED> Not found node : \'%s\' (Double) \n", szNodeName);
        bRet = false;
    }
    sprintf(szNodeName, "ScaleY");
    next = xml_node->FirstChildElement(szNodeName);
    if (!next || XML_SUCCESS != next->QueryDoubleText(&wrp_config_.scale[_Y]))
    {
        LOG("<FAILED> Not found node : \'%s\' (Double) \n", szNodeName);
        bRet = false;
    }
    sprintf(szNodeName, "ScaleZ");
    next = xml_node->FirstChildElement(szNodeName);
    if (!next || XML_SUCCESS != next->QueryDoubleText(&wrp_config_.scale[_Z]))
    {
        LOG("<FAILED> Not found node : \'%s\' (Double) \n", szNodeName);
        bRet = false;
    }
    sprintf(szNodeName, "Distance");
    next = xml_node->FirstChildElement(szNodeName);
    if (!next || XML_SUCCESS != next->QueryDoubleText(&wrp_config_.propagation_distance))
    {
        LOG("<FAILED> Not found node : \'%s\' (Double) \n", szNodeName);
        bRet = false;
    }
    sprintf(szNodeName, "LocationOfWRP");
    next = xml_node->FirstChildElement(szNodeName);
    if (!next || XML_SUCCESS != next->QueryDoubleText(&wrp_config_.wrp_location))
    {
        LOG("<FAILED> Not found node : \'%s\' (Double) \n", szNodeName);
        bRet = false;
    }
    sprintf(szNodeName, "NumOfWRP");
    next = xml_node->FirstChildElement(szNodeName);
    if (!next || XML_SUCCESS != next->QueryIntText(&wrp_config_.num_wrp))
    {
        LOG("<FAILED> Not found node : \'%s\' (Integer) \n", szNodeName);
        bRet = false;
    }
    initialize();


    LOG("**************************************************\n");
    LOG("                Read Config (WRP)                 \n");
    LOG("1) Focal Length : %.5lf\n", wrp_config_.propagation_distance);
    LOG("2) Object Scale : %.5lf / %.5lf / %.5lf\n", wrp_config_.scale[_X], wrp_config_.scale[_Y], wrp_config_.scale[_Z]);
    LOG("3) Number of WRP : %d\n", wrp_config_.num_wrp);
    LOG("**************************************************\n");

    return bRet;
}

void ophWRP::addPixel2WRP(int x, int y, Complex<Real> temp)
{
    const uint pnX = context_.pixel_number[_X];
    const uint pnY = context_.pixel_number[_Y];

    if (x >= 0 && x < (int)pnX && y >= 0 && y < (int)pnY) {
        uint adr = x + y * pnX;
        if (adr == 0) 
            std::cout << ".0";
        p_wrp_[adr] = p_wrp_[adr] + temp;
    }

}

void ophWRP::addPixel2WRP(int x, int y, oph::Complex<Real> temp, oph::Complex<Real>* wrp)
{
    long long int Nx = context_.pixel_number.v[0];
    long long int Ny = context_.pixel_number.v[1];

    if (x >= 0 && x < Nx && y >= 0 && y < Ny) {
        long long int adr = x + y*Nx;
        wrp[adr] += temp[adr];
    }
}

oph::Complex<Real>* ophWRP::calSubWRP(double wrp_d, Complex<Real>* wrp, OphPointCloudData* pc)
{

    Real wave_num = context_.k;   // wave_number
    Real wave_len = context_.wave_length[0];  //wave_length

    int Nx = context_.pixel_number.v[0]; //slm_pixelNumberX
    int Ny = context_.pixel_number.v[1]; //slm_pixelNumberY

    Real wpx = context_.pixel_pitch.v[0];//wrp pitch
    Real wpy = context_.pixel_pitch.v[1];


    int Nx_h = Nx >> 1;
    int Ny_h = Ny >> 1;

    int num = n_points;


#ifdef _OPENMP
#pragma omp parallel for firstprivate(wrp_d, wpx, wpy, Nx_h, Ny_h, wave_num, wave_len)
#endif
    for (int k = 0; k < num; k++) {

        uint idx = 3 * k;
        uint color_idx = pc->n_colors * k;

        Real x = pc->vertices[k].point.pos[_X];
        Real y = pc->vertices[k].point.pos[_Y];
        Real z = pc->vertices[k].point.pos[_Z];
        Real amplitude = pc->vertices[k].color.color[_R];

        float dz = wrp_d - z;
        //  float tw = (int)fabs(wave_len*dz / wpx / wpx / 2 + 0.5) * 2 - 1;
        float tw = fabs(dz)*wave_len / wpx / wpx / 2;

        int w = (int)tw;

        int tx = (int)(x / wpx) + Nx_h;
        int ty = (int)(y / wpy) + Ny_h;

        printf("num=%d, tx=%d, ty=%d, w=%d\n", k, tx, ty, w);

        for (int wy = -w; wy < w; wy++) {
            for (int wx = -w; wx<w; wx++) {//WRP coordinate

                double dx = wx*wpx;
                double dy = wy*wpy;
                double dz = wrp_d - z;

                double sign = (dz>0.0) ? (1.0) : (-1.0);
                double r = sign*sqrt(dx*dx + dy*dy + dz*dz);

                //double tmp_re,tmp_im;
                Complex<Real> tmp;

                tmp[_RE] = (amplitude*cosf(wave_num*r)*cosf(wave_num*wave_len*rand(0, 1))) / (r + 0.05);
                tmp[_IM] = (-amplitude*sinf(wave_num*r)*sinf(wave_num*wave_len*rand(0, 1))) / (r + 0.05);

                if (tx + wx >= 0 && tx + wx < Nx && ty + wy >= 0 && ty + wy < Ny)
                {
                    addPixel2WRP(wx + tx, wy + ty, tmp, wrp);
                }
            }
        }
    }

    return wrp;
}

void ophWRP::calculateWRPCPU()
{
    LOG("%s\n", __FUNCTION__);
    auto begin = CUR_TIME;

    const int pnX = context_.pixel_number[_X]; //slm_pixelNumberX
    const int pnY = context_.pixel_number[_Y]; //slm_pixelNumberY
    const Real ppX = context_.pixel_pitch[_X]; //wrp pitch
    const Real ppY = context_.pixel_pitch[_Y];
    const long long int N = pnX * pnY;
    const uint nChannel = context_.waveNum;
    const Real distance = wrp_config_.propagation_distance;
    int hpnX = pnX >> 1;
    int hpnY = pnY >> 1;

    OphPointCloudData pc = obj_;
    Real wrp_d = wrp_config_.wrp_location;

    // Memory Location for Result Image

    if (p_wrp_) {
        delete[] p_wrp_;
        p_wrp_ = nullptr;
    }
    p_wrp_ = new Complex<Real>[N];
    memset(p_wrp_, 0.0, sizeof(Complex<Real>) * N);
    
    int sum = 0;
    m_nProgress = 0;
    Real ppXX = ppX * ppX * 2;
    Real pi2 = 2 * M_PI;
    Real dz = wrp_d - zmax_;
    Real dzz = dz * dz;

    bool bRandomPhase = GetRandomPhase();

    for (uint ch = 0; ch < nChannel; ch++)
    {
        Real lambda = context_.wave_length[ch];  //wave_length
        Real k = context_.k = pi2 / lambda;
        int iColor = ch;
        int sum = 0;
#ifdef _OPENMP
#pragma omp parallel for firstprivate(iColor, ppXX, pnX, pnY, ppX, ppY, hpnX, hpnY, wrp_d, k, pi2, dz, dzz)
#endif
        for (int i = 0; i < n_points; ++i)
        {
            uint idx = 3 * i;
            uint color_idx = pc.n_colors * i;

            Real x = scaledVertex[i].point.pos[_X];
            Real y = scaledVertex[i].point.pos[_Y];
            Real z = scaledVertex[i].point.pos[_Z];
            Real amplitude = pc.vertices[i].color.color[_R + ch];

            //Real dz = wrp_d - z;
            //Real dzz = dz * dz;
            bool sign = (dz > 0.0) ? true : false;
            //Real tw = fabs(lambda * dz / ppXX + 0.5) * 2 - 1;
            Real tw = fabs(lambda * dz / ppXX) * 2;

            int w = (int)tw;

            int tx = (int)(x / ppX) + hpnX;
            int ty = (int)(y / ppY) + hpnY;

            for (int wy = -w; wy < w; wy++)
            {
                Real dy = wy * ppY;
                Real dyy = dy * dy;
                int tmpY = wy + ty;
                int baseY = tmpY * pnX;

                for (int wx = -w; wx < w; wx++) //WRP coordinate
                {
                    int tmpX = wx + tx;
                    if (tmpX >= 0 && tmpX < pnX && tmpY >= 0 && tmpY < pnY) {
                        uint adr = tmpX + baseY;

                        Real dx = wx * ppX;
                        Real r = sign ? sqrt(dx * dx + dyy + dzz) : -sqrt(dx * dx + dyy + dzz);
                        Real kr = k * r;
                        Real randVal = bRandomPhase ? rand(0.0, 1.0) : 1.0;
                        Real randpi2 = pi2 * randVal;
                        Complex<Real> tmp;
                        tmp[_RE] = (amplitude * cos(kr) * cos(randpi2)) / r;
                        tmp[_IM] = (-amplitude * sin(kr) * sin(randpi2)) / r;

                        if (adr == 0)
                            std::cout << ".0";
#ifdef _OPENMP
#pragma omp atomic
                        p_wrp_[adr][_RE] += tmp[_RE];
#pragma omp atomic
                        p_wrp_[adr][_IM] += tmp[_IM];
#else
                        p_wrp_[adr] += tmp;
#endif                      
                    }
                }
            }
        }
        Fresnel_FFT(p_wrp_, complex_H[ch], lambda, distance);
        //fresnelPropagation(p_wrp_, complex_H[ch], distance, ch);
        memset(p_wrp_, 0.0, sizeof(Complex<Real>) * N);
    }
    delete[] p_wrp_;
    delete[] scaledVertex;
    p_wrp_ = nullptr;
    scaledVertex = nullptr;

    LOG("Total : %lf (s)\n", ELAPSED_TIME(begin, CUR_TIME));

    //return 0.;
}

void ophWRP::generateHologram(void)
{
    resetBuffer();

    auto begin = CUR_TIME;
    LOG("**************************************************\n");
    LOG("                Generate Hologram                 \n");
    LOG("1) Algorithm Method : WRP\n");
    LOG("2) Generate Hologram with %s\n", m_mode & MODE_GPU ?
        "GPU" :
#ifdef _OPENMP
        "Multi Core CPU"
#else
        "Single Core CPU"
#endif
    );
    LOG("3) Random Phase Use : %s\n", GetRandomPhase() ? "Y" : "N");
    LOG("4) Number of Point Cloud : %d\n", n_points);
    LOG("5) Precision Level : %s\n", m_mode & MODE_FLOAT ? "Single" : "Double");
    if (m_mode & MODE_GPU)
        LOG("6) Use FastMath : %s\n", m_mode & MODE_FASTMATH ? "Y" : "N");
    LOG("**************************************************\n");
    
    autoScaling();
    m_mode & MODE_GPU ? calculateWRPGPU() : calculateWRPCPU();

    fftFree();
    LOG("Total Elapsed Time: %lf (s)\n", ELAPSED_TIME(begin, CUR_TIME));
}

Complex<Real>** ophWRP::calculateMWRP(void)
{
    int wrp_num = wrp_config_.num_wrp;

    if (wrp_num < 1)
        return nullptr;

    Complex<Real>** wrp_list = nullptr;

    Real k = context_.k;   // wave_number
    Real lambda = context_.wave_length[0];  //wave_length
    const long long int pnXY = context_.pixel_number[_X] * context_.pixel_number[_Y];

    Complex<Real>* wrp = new Complex<Real>[pnXY];

    //OphPointCloudData pc = obj_;

    for (int i = 0; i < wrp_num; i++)
    {
//      wrp = calSubWRP(wrp_d, wrp, &pc);
        wrp_list[i] = wrp;
    }

    return wrp_list;
}

void ophWRP::ophFree(void)
{
    ophGen::ophFree();

    if (obj_.vertices) {
        delete[] obj_.vertices;
        obj_.vertices = nullptr;
    }
}

void ophWRP::transVW(Real* dst, Real* src, int size)
{
    Real fieldLens = getFieldLens();
    for (int i = 0; i < size; i++) {
        dst[i] = (-fieldLens * src[i]) / (src[i] - fieldLens);
    }
}