#include "iwa_fractalnoisefx.h"

#include "iwa_noise1234.h"

#include "tparamuiconcept.h"

#include <qvector3d></qvector3d>

namespace {

// convert sRGB color space to power space

template <typename t="double"></typename>

inline T to_linear_color_space(T nonlinear_color, T exposure, T gamma) {

  // return -std::log(T(1) - std::pow(nonlinear_color, gamma)) / exposure;

  if (nonlinear_color <= T(0)) return T(0);

  return std::pow(nonlinear_color, gamma) / exposure;

}

// convert power space to sRGB color space

template <typename t="double"></typename>

inline T to_nonlinear_color_space(T linear_color, T exposure, T gamma) {

  // return std::pow(T(1) - std::exp(-exposure * linear_color), T(1) / gamma);

  if (linear_color <= T(0)) return T(0);

  return std::pow(exposure * linear_color, T(1) / gamma);

}

inline double hardlight(const double *dn, const double *up) {

  if ((*up) < 0.5)

    return (*up) * (*dn) * 2.0;

  else

    return 1.0 - 2.0 * (1.0 - (*up)) * (1.0 - (*dn));

}

template <class t="double"></class>

inline const T &clamp(const T &v, const T &lo, const T &hi) {

  assert(!(hi < lo));

  return (v < lo) ? lo : (hi < v) ? hi : v;

}

const double turbulentGamma = 2.2;

// magic number to offset evolution between generations

const double evolutionOffsetStep  = 19.82;

const double evolutionOffsetStepW = 31.1;

}  // namespace

//------------------------------------------------------------------

Iwa_FractalNoiseFx::Iwa_FractalNoiseFx()

    : m_fractalType(new TIntEnumParam(Basic, "Basic"))

    , m_noiseType(new TIntEnumParam(Block, "Block"))

    , m_invert(false)

    , m_rotation(0.0)

    , m_uniformScaling(true)

    , m_scale(100.0)

    , m_scaleW(100.0)

    , m_scaleH(100.0)

    , m_offsetTurbulence(TPointD(0.0, 0.0))

    , m_perspectiveOffset(false)

    , m_complexity(6.0)

    , m_subInfluence(70.0)

    , m_subScaling(56.0)

    , m_subRotation(0.0)

    , m_subOffset(TPointD(0.0, 0.0))

    ///, m_centerSubscale(false)

    , m_evolution(0.0)

    , m_cycleEvolution(false)

    , m_cycleEvolutionRange(1.0)

    ///, m_randomSeed(0)

    , m_dynamicIntensity(1.0)

    , m_alphaRendering(false)

    , m_doConical(false)

    , m_conicalEvolution(0.0)

    , m_conicalAngle(60.0)

    , m_cameraFov(60.0)

    , m_zScale(2.0) {

  m_fractalType->addItem(TurbulentSmooth, "Turbulent Smooth");

  m_fractalType->addItem(TurbulentBasic, "Turbulent Basic");

  m_fractalType->addItem(TurbulentSharp, "Turbulent Sharp");

  m_fractalType->addItem(Dynamic, "Dynamic");

  m_fractalType->addItem(DynamicTwist, "Dynamic Twist");

  m_fractalType->addItem(Max, "Max");

  m_fractalType->addItem(Rocky, "Rocky");

  m_noiseType->addItem(Smooth, "Smooth");

  m_noiseType->setValue(Smooth);

  m_rotation->setMeasureName("angle");

  m_rotation->setValueRange(-360.0, 360.0);

  m_scale->setMeasureName("fxLength");

  m_scale->setValueRange(20.0, 600.0);

  m_scaleW->setMeasureName("fxLength");

  m_scaleW->setValueRange(20.0, 600.0);

  m_scaleH->setMeasureName("fxLength");

  m_scaleH->setValueRange(20.0, 600.0);

  m_offsetTurbulence->getX()->setMeasureName("fxLength");

  m_offsetTurbulence->getY()->setMeasureName("fxLength");

  m_complexity->setValueRange(1.0, 10.0);

  m_subInfluence->setValueRange(25.0, 100.0);

  m_subScaling->setValueRange(25.0, 100.0);

  m_subRotation->setMeasureName("angle");

  m_subRotation->setValueRange(-360.0, 360.0);

  m_subOffset->getX()->setMeasureName("fxLength");

  m_subOffset->getY()->setMeasureName("fxLength");

  m_evolution->setValueRange(-100.0, 100.0);

  m_cycleEvolutionRange->setValueRange(0.1, 30.0);

  m_dynamicIntensity->setValueRange(-10.0, 10.0);

  m_conicalEvolution->setValueRange(-100, 100.0);

  m_conicalAngle->setValueRange(0.0, 89.9);

  m_cameraFov->setValueRange(10.0, 170.0);

  m_zScale->setValueRange(0.0, 3.0);

  bindParam(this, "fractalType", m_fractalType);

  bindParam(this, "noiseType", m_noiseType);

  bindParam(this, "invert", m_invert);

  bindParam(this, "rotation", m_rotation);

  bindParam(this, "uniformScaling", m_uniformScaling);

  bindParam(this, "scale", m_scale);

  bindParam(this, "scaleW", m_scaleW);

  bindParam(this, "scaleH", m_scaleH);

  bindParam(this, "offsetTurbulence", m_offsetTurbulence);

  bindParam(this, "perspectiveOffset", m_perspectiveOffset);

  bindParam(this, "complexity", m_complexity);

  bindParam(this, "subInfluence", m_subInfluence);

  bindParam(this, "subScaling", m_subScaling);

  bindParam(this, "subRotation", m_subRotation);

  bindParam(this, "subOffset", m_subOffset);

  /// bindParam(this, "centerSubscale", m_centerSubscale);

  bindParam(this, "evolution", m_evolution);

  bindParam(this, "cycleEvolution", m_cycleEvolution);

  bindParam(this, "cycleEvolutionRange", m_cycleEvolutionRange);

  /// bindParam(this, "randomSeed", m_randomSeed);

  bindParam(this, "dynamicIntensity", m_dynamicIntensity);

  bindParam(this, "doConical", m_doConical);

  bindParam(this, "conicalEvolution", m_conicalEvolution);

  bindParam(this, "conicalAngle", m_conicalAngle);

  bindParam(this, "cameraFov", m_cameraFov);

  bindParam(this, "zScale", m_zScale);

  bindParam(this, "alphaRendering", m_alphaRendering);

  enableComputeInFloat(true);

}

//------------------------------------------------------------------

bool Iwa_FractalNoiseFx::doGetBBox(double frame, TRectD &bBox,

                                   const TRenderSettings &ri) {

  bBox = TConsts::infiniteRectD;

  return true;

}

//------------------------------------------------------------------

void Iwa_FractalNoiseFx::doCompute(TTile &tile, double frame,

                                   const TRenderSettings &ri) {

  // obtain current parameters

  FNParam param;

  obtainParams(param, frame, ri.m_affine);

  Noise1234 pn;

  TDimension outDim = tile.getRaster()->getSize();

  // allocate buffer for accumulating the noise patterns

  TRasterGR8P out_buf_ras = TRasterGR8P(outDim.lx * sizeof(double), outDim.ly);

  out_buf_ras->clear();

  out_buf_ras->lock();

  double *out_buf = (double *)out_buf_ras->getRawData();

  // allocate buffer for storing the noise pattern of each generation

  TRasterGR8P work_buf_ras = TRasterGR8P(outDim.lx * sizeof(double), outDim.ly);

  work_buf_ras->lock();

  double *work_buf = (double *)work_buf_ras->getRawData();

  // affine transformations

  TAffine globalAff = TTranslation(-tile.m_pos) * ri.m_affine;

  TAffine parentAff =

      TScale(param.scale.lx, param.scale.ly) * TRotation(-param.rotation);

  TAffine subAff = TTranslation(param.subOffset) * TScale(param.subScaling) *

                   TRotation(-param.subRotation);

  TAffine genAff;

  // for cyclic evolution, rotate the sample position in ZW space instead of

  // using the periodic noise in Z space so that it can cycle in arbitral

  // period.

  double evolution_z = param.evolution;

  TPointD evolution_zw;

  if (param.cycleEvolution) {

    double theta   = 2.0 * M_PI * param.evolution / param.cycleEvolutionRange;

    double d       = param.cycleEvolutionRange / (2.0 * M_PI);

    evolution_zw.x = d * cos(theta);

    evolution_zw.y = d * sin(theta);

  }

  int genCount = (int)std::ceil(param.complexity);

  if (!param.doConical) {

    TAffine parentOffsetAff = TTranslation(param.offsetTurbulence);

    // accumulate base noise pattern for each generation

    for (int gen = 0; gen < genCount; gen++) {

      // affine transformation for the current generation

      TAffine currentAff =

          (globalAff * parentOffsetAff * parentAff * genAff).inv();

      // scale of the current pattern ( used for the Dynamic / Dynamic Twist

      // offset )

      double scale = sqrt(std::abs(currentAff.det()));

      // for each pixel

      double *buf_p = work_buf;

      for (int y = 0; y < outDim.ly; y++) {

        for (int x = 0; x < outDim.lx; x++, buf_p++) {

          // obtain sampling position

          // For Dynamic and Dynamic Twist patterns, the position offsets using

          // gradient / rotation of the parent pattern

          TPointD samplePos =

              getSamplePos(x, y, outDim, out_buf, gen, scale, param);

          // multiply affine transformation

          samplePos = currentAff * samplePos;

          // adjust position for the block pattern

          if (param.noiseType == Block)

            samplePos = TPointD(std::floor(samplePos.x) + 0.5,

                                std::floor(samplePos.y) + 0.5);

          // calculate the base noise

          if (param.cycleEvolution)

            *buf_p = (pn.noise(samplePos.x, samplePos.y, evolution_zw.x,

                               evolution_zw.y) +

                      1.0) *

                     0.5;

          else

            *buf_p =

                (pn.noise(samplePos.x, samplePos.y, evolution_z) + 1.0) * 0.5;

          // convert the noise

          convert(buf_p, param);

        }

      }

      // just copy the values for the first generation

      if (gen == 0) {

        memcpy(out_buf, work_buf, outDim.lx * outDim.ly * sizeof(double));

      } else {

        // intensity of the last generation will take the fraction part of

        // complexity

        double genIntensity = std::min(1.0, param.complexity - (double)gen);

        // influence of the current generation

        double influence =

            genIntensity * std::pow(param.subInfluence, (double)gen);

        // composite the base noise pattern

        buf_p         = work_buf;

        double *out_p = out_buf;

        for (int i = 0; i < outDim.lx * outDim.ly; i++, buf_p++, out_p++)

          composite(out_p, buf_p, influence, param);

      }

      // update affine transformations (for the next generation loop)

      genAff *= subAff;

      // When the "Perspective Offset" option is ON, reduce the offset amount

      // according to the sub scale

      if (param.perspectiveOffset)

        parentOffsetAff = TScale(param.subScaling) *

                          TRotation(-param.subRotation) * parentOffsetAff *

                          TRotation(param.subRotation) *

                          TScale(1 / param.subScaling);

      if (param.cycleEvolution)

        evolution_zw.x += evolutionOffsetStep;

      else

        evolution_z += evolutionOffsetStep;

    }

  }

  // conical noise

  else {

    // angle of slope of the cone

    double theta_n = param.conicalAngle * M_PI_180;

    // half of the vertical fov

    double phi_2       = param.cameraFov * 0.5 * M_PI_180;

    double z_scale     = std::pow(10.0, param.zScale);

    double evolution_w = param.conicalEvolution;

    // pixel distance between camera and the screen

    double D = ri.m_cameraBox.getLy() * 0.5 / std::tan(phi_2);

    // the line on the slope :  d = U * z + V

    double U = -1.0 / std::tan(theta_n);

    double V = ri.m_cameraBox.getLy() * 0.5;

    TPointD center = ri.m_affine * param.offsetTurbulence;

    // accumulate base noise pattern for each generation

    for (int gen = 0; gen < genCount; gen++) {

      // affine transformation for the current generation

      TAffine currentAff = (globalAff * parentAff * genAff).inv();

      // scale of the current pattern ( used for the Dynamic / Dynamic Twist

      // offset )

      double scale = sqrt(std::abs(currentAff.det()));

      // for each pixel

      double *buf_p = work_buf;

      for (int y = 0; y < outDim.ly; y++) {

        for (int x = 0; x < outDim.lx; x++, buf_p++) {

          double dx, dy, dz;

          if (theta_n == 0.0) {

            dx = x;

            dy = y;

            dz = 0.0;

          } else {

            // conical, without offset

            if (center == TPointD()) {

              TPointD p = TTranslation(tile.m_pos) * TPointD(x, y);

              // pixel distance from the screen center

              double d = tdistance(p, TPointD());

              // line of sight : d = S * z + T

              double S  = d / D;

              double T  = d;

              dz        = (V - T) / (S - U);

              double dp = S * dz + T;

              if (d != 0.0) {

                p.x *= dp / d;

                p.y *= dp / d;

              }

              p += center * (dp / V);

              p  = TTranslation(tile.m_pos).inv() * p;

              dx = p.x;

              dy = p.y;

              dz /= z_scale;

            }

            // conical, with offset

            else {

              // compute the intersecting point between the "noise cone" and the

              // line of sight

              TPointD _p = TTranslation(tile.m_pos) * TPointD(x, y);

              // offset by combination of offsets of A) projection position and

              // B) eye position.

              //

              // A) 0.5 * projection position offset

              QVector3D p(_p.x - center.x * 0.5, _p.y - center.y * 0.5, 0.0);

              QVector3D cone_C(0.0, 0.0, V * std::tan(theta_n));

              QVector3D cone_a(0, 0, -1);

              // B) 0.5 * eye position offset

              double offsetAdj = 0.5 * (D + cone_C.z()) / cone_C.z();

              QVector3D eye_O(center.x * offsetAdj, center.y * offsetAdj, -D);

              QVector3D eye_d  = (p - eye_O).normalized();

              double cos_ConeT = std::sin(theta_n);

              float d_a   = QVector3D::dotProduct(eye_d, cone_a);

              float Ca_Oa = QVector3D::dotProduct(cone_C, cone_a) -

                            QVector3D::dotProduct(eye_O, cone_a);

              // A * t^2 + B * t + C = 0

              float A =

                  d_a * d_a - eye_d.lengthSquared() * cos_ConeT * cos_ConeT;

              float B = 2.0 *

                            (QVector3D::dotProduct(eye_d, cone_C) -

                             QVector3D::dotProduct(eye_d, eye_O)) *

                            cos_ConeT * cos_ConeT -

                        2.0 * Ca_Oa * d_a;

              float C = Ca_Oa * Ca_Oa -

                        cos_ConeT * cos_ConeT *

                            (cone_C.lengthSquared() -

                             2.0 * QVector3D::dotProduct(eye_O, cone_C) +

                             eye_O.lengthSquared());

              // obtain t

              double t1 = (-B + std::sqrt(B * B - 4.0 * A * C)) / (2.0 * A);

              double t2 = (-B - std::sqrt(B * B - 4.0 * A * C)) / (2.0 * A);

              if (t1 < 0)

                t1 = t2;

              else if (t2 < 0)

                t2 = t1;

              double t = std::min(t1, t2);

              // intersecting point

              QVector3D sampleP = eye_O + eye_d * t;

              _p.x              = sampleP.x();

              _p.y              = sampleP.y();

              _p                = TTranslation(tile.m_pos).inv() * _p;

              dx                = _p.x;

              dy                = _p.y;

              dz                = sampleP.z() / z_scale;

            }

            if (param.cycleEvolution) {

              double cycle_theta =

                  2.0 * M_PI * (param.evolution + param.conicalEvolution + dz) /

                  param.cycleEvolutionRange;

              double cycle_d = param.cycleEvolutionRange / (2.0 * M_PI);

              evolution_zw.x = cycle_d * cos(cycle_theta);

              evolution_zw.y = cycle_d * sin(cycle_theta);

            }

          }

          // obtain sampling position

          // For Dynamic and Dynamic Twist patterns, the position offsets using

          // gradient / rotation of the parent pattern

          TPointD samplePosOffset =

              getSamplePos(x, y, outDim, out_buf, gen, scale, param) -

              TPointD(x, y);

          TPointD samplePos =

              TPointD(dx, dy) + samplePosOffset * (D / (D + dz));

          // multiply affine transformation

          samplePos = currentAff * samplePos;

          // adjust position for the block pattern

          if (param.noiseType == Block)

            samplePos = TPointD(std::floor(samplePos.x) + 0.5,

                                std::floor(samplePos.y) + 0.5);

          // calculate the base noise

          if (param.cycleEvolution)

            *buf_p = (pn.noise(samplePos.x, samplePos.y, evolution_zw.x,

                               evolution_zw.y) +

                      1.0) *

                     0.5;

          else

            *buf_p = (pn.noise(samplePos.x, samplePos.y, evolution_z,

                               evolution_w + dz) +

                      1.0) *

                     0.5;

          // convert the noise

          convert(buf_p, param);

        }

      }

      // just copy the values for the first generation

      if (gen == 0) {

        memcpy(out_buf, work_buf, outDim.lx * outDim.ly * sizeof(double));

      } else {

        // intensity of the last generation will take the fraction part of

        // complexity

        double genIntensity = std::min(1.0, param.complexity - (double)gen);

        // influence of the current generation

        double influence =

            genIntensity * std::pow(param.subInfluence, (double)gen);

        // composite the base noise pattern

        buf_p         = work_buf;

        double *out_p = out_buf;

        for (int i = 0; i < outDim.lx * outDim.ly; i++, buf_p++, out_p++)

          composite(out_p, buf_p, influence, param);

      }

      // update affine transformations (for the next generation loop)

      genAff *= subAff;

      if (param.cycleEvolution)

        evolution_zw.x += evolutionOffsetStep;

      else {

        evolution_z += evolutionOffsetStep;

        evolution_w += evolutionOffsetStepW;

      }

    }

  }

  work_buf_ras->unlock();

  // finalize pattern (converting the color space)

  if (param.fractalType == TurbulentSmooth ||

      param.fractalType == TurbulentBasic ||

      param.fractalType == TurbulentSharp) {

    double *out_p = out_buf;

    for (int i = 0; i < outDim.lx * outDim.ly; i++, out_p++)

      finalize(out_p, param);

  }

  tile.getRaster()->clear();

  // convert to RGB channel values

  TRaster32P ras32 = (TRaster32P)tile.getRaster();

  TRaster64P ras64 = (TRaster64P)tile.getRaster();

  TRasterFP rasF   = (TRasterFP)tile.getRaster();

  if (ras32)

    outputRaster<traster32p, tpixel32="">(ras32, out_buf, param);</traster32p,>

  else if (ras64)

    outputRaster<traster64p, tpixel64="">(ras64, out_buf, param);</traster64p,>

  else if (rasF)

    outputRaster<trasterfp, tpixelf="">(rasF, out_buf, param);</trasterfp,>

  out_buf_ras->unlock();

}

//------------------------------------------------------------------

// obtain current parameters

void Iwa_FractalNoiseFx::obtainParams(FNParam ¶m, const double frame,

                                      const TAffine &aff) {

  param.fractalType = (FractalType)m_fractalType->getValue();

  param.noiseType   = (NoiseType)m_noiseType->getValue();

  param.invert      = m_invert->getValue();

  param.rotation    = m_rotation->getValue(frame);  // in degree, not radian

  if (m_uniformScaling->getValue()) {               // uniform case

    double s    = m_scale->getValue(frame);

    param.scale = TDimensionD(s, s);

  } else {  // non-uniform case

    param.scale.lx = m_scaleW->getValue(frame);

    param.scale.ly = m_scaleH->getValue(frame);

  }

  assert(param.scale.lx != 0.0 && param.scale.ly != 0.0);

  if (param.scale.lx == 0.0) param.scale.lx = 1e-8;

  if (param.scale.ly == 0.0) param.scale.ly = 1e-8;

  param.offsetTurbulence  = m_offsetTurbulence->getValue(frame);

  param.perspectiveOffset = m_perspectiveOffset->getValue();

  param.complexity        = m_complexity->getValue(frame);

  if (param.complexity < 1.0)

    param.complexity =

        1.0;  // at least the first generation is rendered in full opacity

  param.subInfluence =

      m_subInfluence->getValue(frame) / 100.0;  // normalize to 0 - 1

  param.subScaling =

      m_subScaling->getValue(frame) / 100.0;           // normalize to 0 - 1

  param.subRotation = m_subRotation->getValue(frame);  // in degree, not radian

  param.subOffset   = m_subOffset->getValue(frame);

  param.evolution   = m_evolution->getValue(frame);

  param.cycleEvolution      = m_cycleEvolution->getValue();

  param.cycleEvolutionRange = m_cycleEvolutionRange->getValue(frame);

  param.dynamicIntensity    = m_dynamicIntensity->getValue(frame) * 10.0;

  param.doConical        = m_doConical->getValue();

  param.conicalEvolution = m_conicalEvolution->getValue(frame);

  param.conicalAngle     = m_conicalAngle->getValue(frame);

  param.cameraFov        = m_cameraFov->getValue(frame);

  param.zScale           = m_zScale->getValue(frame);

  param.alphaRendering = m_alphaRendering->getValue();

}

//------------------------------------------------------------------

template <typename pixel="" raster,="" typename=""></typename>

void Iwa_FractalNoiseFx::outputRaster(const RASTER outRas, double *out_buf,

                                      const FNParam ¶m) {

  TDimension dim = outRas->getSize();

  double *buf_p  = out_buf;

  bool doClamp   = !(outRas->getPixelSize() == 16);

  for (int j = 0; j < dim.ly; j++) {

    PIXEL *pix = outRas->pixels(j);

    for (int i = 0; i < dim.lx; i++, pix++, buf_p++) {

      double val = (param.invert) ? 1.0 - (*buf_p) : (*buf_p);

      if (doClamp) val = clamp(val, 0.0, 1.0);

      typename PIXEL::Channel chan = static_cast<typename pixel::channel="">(</typename>

          val * (double)PIXEL::maxChannelValue);

      pix->r = chan;

      pix->g = chan;

      pix->b = chan;

      pix->m = (param.alphaRendering) ? chan : PIXEL::maxChannelValue;

    }

  }

}

//------------------------------------------------------------------

void Iwa_FractalNoiseFx::getParamUIs(TParamUIConcept *&concepts, int &length) {

  concepts = new TParamUIConcept[length = 2];

  concepts[0].m_type  = TParamUIConcept::POINT;

  concepts[0].m_label = "Offset Turbulence";

  concepts[0].m_params.push_back(m_offsetTurbulence);

  concepts[1].m_type  = TParamUIConcept::POINT;

  concepts[1].m_label = "Sub Offset";

  concepts[1].m_params.push_back(m_subOffset);

}

//------------------------------------------------------------------

// For Dynamic and Dynamic Twist patterns, the position offsets using gradient /

// rotation of the parent pattern

TPointD Iwa_FractalNoiseFx::getSamplePos(double x, double y,

                                         const TDimension outDim,

                                         const double *out_buf, const int gen,

                                         const double scale,

                                         const FNParam ¶m) {

  // the position does not offset in the first generation

  if (gen == 0 || param.dynamicIntensity == 0.0 ||

      (param.fractalType != Dynamic && param.fractalType != DynamicTwist))

    return TPointD(x, y);

  auto clampPos = [&](double x, double y) {

    if (x < 0.0)

      x = 0.0;

    else if (x > (double)(outDim.lx - 1))

      x = (double)(outDim.lx - 1);

    if (y < 0.0)

      y = 0.0;

    else if (y > (double)(outDim.ly - 1))

      y = (double)(outDim.ly - 1);

    return TPointD(x, y);

  };

  auto val = [&](const TPoint &p) {

    return out_buf[std::min(p.y, outDim.ly - 1) * outDim.lx +

                   std::min(p.x, outDim.lx - 1)];

  };

  auto lerp = [](double v0, double v1, double ratio) {

    return (1.0 - ratio) * v0 + ratio * v1;

  };

  auto lerpVal = [&](const TPointD &p) {

    int id_x       = (int)std::floor(p.x);

    double ratio_x = p.x - (double)id_x;

    int id_y       = (int)std::floor(p.y);

    double ratio_y = p.y - (double)id_y;

    return lerp(

        lerp(val(TPoint(id_x, id_y)), val(TPoint(id_x + 1, id_y)), ratio_x),

        lerp(val(TPoint(id_x, id_y + 1)), val(TPoint(id_x + 1, id_y + 1)),

             ratio_x),

        ratio_y);

  };

  int range     = std::max(2, (int)(0.1 / scale));

  TPointD left  = clampPos(x - range, y);

  TPointD right = clampPos(x + range, y);

  TPointD down  = clampPos(x, y - range);

  TPointD up    = clampPos(x, y + range);

  double dif_x = param.dynamicIntensity * (1 / scale) *

                 (lerpVal(left) - lerpVal(right)) / (left.x - right.x);

  double dif_y = param.dynamicIntensity * (1 / scale) *

                 (lerpVal(up) - lerpVal(down)) / (up.y - down.y);

  if (param.fractalType == Dynamic)

    return TPointD(x + dif_x, y + dif_y);  // gradient

  else                                     // Dynamic_twist

    return TPointD(x + dif_y, y - dif_x);  // rotation

}

//------------------------------------------------------------------

// convert the noise

void Iwa_FractalNoiseFx::convert(double *buf, const FNParam ¶m) {

  if (param.fractalType == Basic || param.fractalType == Dynamic ||

      param.fractalType == DynamicTwist)

    return;

  switch (param.fractalType) {

  case TurbulentSmooth:

    *buf = std::pow(std::abs(*buf - 0.5), 2.0) * 3.75;

    *buf = to_linear_color_space(*buf, 1.0, turbulentGamma);

    break;

  case TurbulentBasic:

    *buf = std::pow(std::abs(*buf - 0.5), 1.62) * 4.454;

    *buf = to_linear_color_space(*buf, 1.0, turbulentGamma);

    break;

  case TurbulentSharp:

    *buf = std::pow(std::abs(*buf - 0.5), 0.725) * 1.77;

    *buf = to_linear_color_space(*buf, 1.0, turbulentGamma);

    break;

  case Max:

    *buf = std::abs(*buf - 0.5) * 1.96;

    break;

  case Rocky:

    // conversion LUT for the range from 0.43 to 0.57, every 0.01

    static double table[15] = {

        0.25,        0.256658635, 0.275550218, 0.30569519,  0.345275591,

        0.392513494, 0.440512,    0.5,         0.555085147, 0.607486506,

        0.654724409, 0.69430481,  0.724449782, 0.743341365, 0.75};

    if (*buf <= 0.43)

      *buf = 0.25;

    else if (*buf >= 0.57)

      *buf = 0.75;

    else {

      int id   = (int)std::floor(*buf * 100.0) - 43;

      double t = *buf * 100.0 - (double)(id + 43);

      // linear interpolation the LUT values

      *buf = (1 - t) * table[id] + t * table[id + 1];

    }

    break;

  }

}

//------------------------------------------------------------------

// composite the base noise pattern

void Iwa_FractalNoiseFx::composite(double *out, double *buf,

                                   const double influence,

                                   const FNParam ¶m) {

  switch (param.fractalType) {

  case Basic:

  case Dynamic:

  case DynamicTwist:

  case Rocky: {

    // hard light composition

    double val = hardlight(out, buf);

    *out       = (1.0 - influence) * (*out) + influence * val;

    break;

  }

  case TurbulentSmooth:

  case TurbulentBasic:

  case TurbulentSharp:

    // add composition in the linear color space

    *out += (*buf) * influence;

    break;

  case Max:

    // max composition

    *out = std::max(*out, influence * (*buf));

    break;

  default: {

    double val = hardlight(out, buf);

    *out       = (1.0 - influence) * (*out) + influence * val;

    break;

  }

  }

}

//------------------------------------------------------------------

// finalize pattern (converting the color space)

void Iwa_FractalNoiseFx::finalize(double *out, const FNParam ¶m) {

  assert(param.fractalType == TurbulentSmooth ||

         param.fractalType == TurbulentBasic ||

         param.fractalType == TurbulentSharp);

  // TurbulentSmooth / TurbulentBasic / TurbulentSharp

  *out = to_nonlinear_color_space(*out, 1.0, turbulentGamma);

}

FX_PLUGIN_IDENTIFIER(Iwa_FractalNoiseFx, "iwa_FractalNoiseFx");