/*------------------------------------

Iwa_SpectrumFx

参照画像を位相差として、干渉色を出力する

------------------------------------*/

#include "iwa_spectrumfx.h"

#include "iwa_cie_d65.h"

#include "iwa_xyz.h"

namespace {

const float PI = 3.14159265f;

}

/*------------------------------------

 Calculate soap bubble color map

------------------------------------*/

void Iwa_SpectrumFx::calcBubbleMap(float3 *bubbleColor, double frame,

                                   bool computeAngularAxis) {

  int i, j, k;  /* bubbleColor[j][k] = [256][3] */

  float d;      /* Thickness of the film (μm) */

  int ram;      /* rambda iterator */

  float rambda; /* wavelength of light (μm) */

  struct REFLECTIVITY {

    /* transmission and reflection amplitudes for each boundary */

    float r_ab, t_ab, r_ba, t_ba;

    float r_real, r_img; /* reflection amplitude of the film */

    float R;             /* energy reflectance */

  } p, s;

  float R_final;                   /* combined energy reflectance */

  float phi;                       /* phase */

  float color_x, color_y, color_z; /* xyz color channels */

  /* obtain parameters */

  float intensity       = (float)m_intensity->getValue(frame);

  float refractiveIndex = (float)m_refractiveIndex->getValue(frame);

  float thickMax        = (float)m_thickMax->getValue(frame);

  float thickMin        = (float)m_thickMin->getValue(frame);

  float rgbGamma[3]     = {(float)m_RGamma->getValue(frame),

                       (float)m_GGamma->getValue(frame),

                       (float)m_BGamma->getValue(frame)};

  float lensFactor = (float)m_lensFactor->getValue(frame);

  float shift      = (float)m_spectrumShift->getValue(frame);

  float fadeWidth  = (float)m_loopSpectrumFadeWidth->getValue(frame) / 2.0f;

  /* for Iwa_SpectrumFx, incident angle is fixed to 0,

     for Iwa_SoapBubbleFx, compute for all discrete incident angles*/

  int i_max        = (computeAngularAxis) ? 256 : 1;

  float3 *bubble_p = bubbleColor;

  /* for each discrete incident angle */

  for (i = 0; i < i_max; i++) {

    /* incident angle (radian) */

    float angle_in = PI / 2.0f / 255.0f * (float)i;

    /* refraction angle (radian) */

    float angle_re = asinf(sinf(angle_in) / refractiveIndex);

    /* transmission and reflection amplitudes for each boundary, for each

     * polarization */

    float cos_in = cosf(angle_in);

    float cos_re = cosf(angle_re);

    // compute the offset in order to make the seam of looped-spectrum curved

    // along the stripe

    float seam_offset = 0.0f;

    if (fadeWidth != 0.0f) {  // if the fade width is 0, the seam does not curve

      float base_light_diff =

          (thickMax + thickMin) / cosf(asinf(1 / refractiveIndex));

      float offset_width = 0.5f * (base_light_diff - thickMax - thickMin);

      seam_offset        = 0.5f * (base_light_diff *

                                cosf(asinf(cosf(angle_in) / refractiveIndex)) -

                            thickMax - thickMin - offset_width);

    }

    // P-polarized light

    p.r_ab = (cos_re - refractiveIndex * cos_in) /

             (cos_re + refractiveIndex * cos_re);

    p.t_ab = (1.0f - p.r_ab) / refractiveIndex;

    p.r_ba = -p.r_ab;

    p.t_ba = (1.0f + p.r_ab) * refractiveIndex;

    // S-polarized light

    s.r_ab = (cos_in - refractiveIndex * cos_re) /

             (cos_in + refractiveIndex * cos_re);

    s.t_ab = 1.0f + s.r_ab;

    s.r_ba = -s.r_ab;

    s.t_ba = 1.0f - s.r_ab;

    /* for each discrete thickness */

    for (j = 0; j < 256; j++) {

      // normalize within 0-1 and shift

      float t = (float)j / 255.0f + shift;

      // get fractional part

      t -= std::floor(t);

      // apply lens factor

      t = powf(t, lensFactor);

      float tmp_rgb[2][3];

      float tmp_t[2];

      float tmp_ratio[2];

      if (t < seam_offset - fadeWidth) {

        tmp_t[0]     = t + 1.0f;

        tmp_t[1]     = 0;  // unused

        tmp_ratio[0] = 1.0f;

        tmp_ratio[1] = 0.0f;

      } else if (t < seam_offset + fadeWidth) {

        tmp_t[0]     = t;

        tmp_t[1]     = t + 1.0f;

        tmp_ratio[0] = 0.5f + 0.5f * (t - seam_offset) / fadeWidth;

        tmp_ratio[1] = 1.0f - tmp_ratio[0];

      } else if (t > 1.0f + seam_offset + fadeWidth) {

        tmp_t[0]     = t - 1.0f;

        tmp_t[1]     = 0;  // unused

        tmp_ratio[0] = 1.0f;

        tmp_ratio[1] = 0.0f;

      } else if (t > 1.0f + seam_offset - fadeWidth) {

        tmp_t[0]     = t;

        tmp_t[1]     = t - 1.0f;

        tmp_ratio[0] = 0.5f + 0.5f * (1.0f - t + seam_offset) / fadeWidth;

        tmp_ratio[1] = 1.0f - tmp_ratio[0];

      } else {  // no fade

        tmp_t[0]     = t;

        tmp_t[1]     = 0;  // unused

        tmp_ratio[0] = 1.0f;

        tmp_ratio[1] = 0.0f;

      }

      /* compute colors for two thickness values and fade them*/

      for (int fadeId = 0; fadeId < 2; fadeId++) {

        // if composit ratio is 0, skip computing

        if (tmp_ratio[fadeId] == 0.0f) continue;

        /* calculate the thickness of film (μm) */

        d = thickMin + (thickMax - thickMin) * tmp_t[fadeId];

        /* there may be a case that the thickness is smaller than 0 */

        if (d < 0.0f) d = 0.0f;

        /* initialize XYZ color channels */

        color_x = 0.0f;

        color_y = 0.0f;

        color_z = 0.0f;

        /* for each wavelength (in the range of visible light, 380nm-710nm) */

        for (ram = 0; ram < 34; ram++) {

          /* wavelength `λ` (μm) */

          rambda = 0.38f + 0.01f * (float)ram;

          /* phase of light */

          phi = 4.0f * PI * refractiveIndex * d * cos_re / rambda;

          /* reflection amplitude of the film for each polarization */

          // P-polarized light

          p.r_real = p.r_ab + p.t_ab * p.r_ba * p.t_ba * cosf(phi);

          p.r_img  = p.t_ab * p.r_ba * p.t_ba * sinf(phi);

          // S-polarized light

          s.r_real = s.r_ab + s.t_ab * s.r_ba * s.t_ba * cosf(phi);

          s.r_img  = s.t_ab * s.r_ba * s.t_ba * sinf(phi);

          p.R = p.r_real * p.r_real + p.r_img * p.r_img;

          s.R = s.r_real * s.r_real + s.r_img * s.r_img;

          /* combined energy reflectance */

          R_final = (p.R + s.R) / 2.0f;

          /* accumulate XYZ channel values */

          color_x += intensity * cie_d65[ram] * R_final * xyz[ram * 3 + 0];

          color_y += intensity * cie_d65[ram] * R_final * xyz[ram * 3 + 1];

          color_z += intensity * cie_d65[ram] * R_final * xyz[ram * 3 + 2];

        } /* next wavelength (ram) */

        tmp_rgb[fadeId][0] =

            3.240479f * color_x - 1.537150f * color_y - 0.498535f * color_z;

        tmp_rgb[fadeId][1] =

            -0.969256f * color_x + 1.875992f * color_y + 0.041556f * color_z;

        tmp_rgb[fadeId][2] =

            0.055648f * color_x - 0.204043f * color_y + 1.057311f * color_z;

        /* clamp overflows */

        for (k = 0; k < 3; k++) {

          if (tmp_rgb[fadeId][k] < 0.0f) tmp_rgb[fadeId][k] = 0.0f;

          /* gamma adjustment */

          tmp_rgb[fadeId][k] = powf((tmp_rgb[fadeId][k] / 255.0f), rgbGamma[k]);

          if (tmp_rgb[fadeId][k] >= 1.0f) tmp_rgb[fadeId][k] = 1.0f;

        }

      }

      bubble_p->x = tmp_rgb[0][0] * tmp_ratio[0] + tmp_rgb[1][0] * tmp_ratio[1];

      bubble_p->y = tmp_rgb[0][1] * tmp_ratio[0] + tmp_rgb[1][1] * tmp_ratio[1];

      bubble_p->z = tmp_rgb[0][2] * tmp_ratio[0] + tmp_rgb[1][2] * tmp_ratio[1];

      bubble_p++;

    } /*- next thickness d (j) -*/

  }   /*- next incident angle (i) -*/

}

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

Iwa_SpectrumFx::Iwa_SpectrumFx()

    : m_intensity(1.0)

    , m_refractiveIndex(1.25)

    , m_thickMax(1.0)

    , m_thickMin(0.0)

    , m_RGamma(1.0)

    , m_GGamma(1.0)

    , m_BGamma(1.0)

    , m_lensFactor(1.0)

    , m_lightThres(1.0)

    , m_lightIntensity(1.0)

    , m_loopSpectrumFadeWidth(0.0)

    , m_spectrumShift(0.0) {

  addInputPort("Source", m_input);

  addInputPort("Light", m_light);

  bindParam(this, "intensity", m_intensity);

  bindParam(this, "refractiveIndex", m_refractiveIndex);

  bindParam(this, "thickMax", m_thickMax);

  bindParam(this, "thickMin", m_thickMin);

  bindParam(this, "RGamma", m_RGamma);

  bindParam(this, "GGamma", m_GGamma);

  bindParam(this, "BGamma", m_BGamma);

  bindParam(this, "lensFactor", m_lensFactor);

  bindParam(this, "lightThres", m_lightThres);

  bindParam(this, "lightIntensity", m_lightIntensity);

  bindParam(this, "loopSpectrumFadeWidth", m_loopSpectrumFadeWidth);

  bindParam(this, "spectrumShift", m_spectrumShift);

  m_intensity->setValueRange(0.0, 8.0);

  m_refractiveIndex->setValueRange(1.0, 3.0);

  m_thickMax->setValueRange(-1.5, 2.0);

  m_thickMin->setValueRange(-1.5, 2.0);

  m_RGamma->setValueRange(0.001, 1.0);

  m_GGamma->setValueRange(0.001, 1.0);

  m_BGamma->setValueRange(0.001, 1.0);

  m_lensFactor->setValueRange(0.01, 10.0);

  m_lightThres->setValueRange(-5.0, 1.0);

  m_lightIntensity->setValueRange(0.0, 1.0);

  m_loopSpectrumFadeWidth->setValueRange(0.0, 1.0);

  m_spectrumShift->setValueRange(-10.0, 10.0);

}

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

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

                               const TRenderSettings &settings) {

  if (!m_input.isConnected()) return;

  /*- 薄膜干渉色マップ -*/

  float3 *bubbleColor;

  TDimensionI dim(tile.getRaster()->getLx(), tile.getRaster()->getLy());

  /*- 256段階で干渉色を計算 -*/

  TRasterGR8P bubbleColor_ras(sizeof(float3) * 256, 1);

  bubbleColor_ras->lock();

  bubbleColor = (float3 *)bubbleColor_ras->getRawData();

  /*- シャボン色マップの生成 -*/

  calcBubbleMap(bubbleColor, frame);

  /*- いったん素材をTileに収める -*/

  m_input->compute(tile, frame, settings);

  /*--------------------

   ここで、Lightが刺さっていた場合は、Lightのアルファを使用＆HDRThresでスクリーン合成

  --------------------*/

  TRasterP lightRas = 0;

  if (m_light.isConnected()) {

    TTile light_tile;

    m_light->allocateAndCompute(light_tile, tile.m_pos, dim, tile.getRaster(),

                                frame, settings);

    lightRas = light_tile.getRaster();

    lightRas->lock();

  }

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

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

  {

    if (ras32) {

      if (lightRas)

        convertRasterWithLight<traster32p, tpixel32="">(</traster32p,>

            ras32, dim, bubbleColor, (TRaster32P)lightRas,

            (float)m_lightThres->getValue(frame),

            (float)m_lightIntensity->getValue(frame));

      else

        convertRaster<traster32p, tpixel32="">(ras32, dim, bubbleColor);</traster32p,>

    } else if (ras64) {

      if (lightRas)

        convertRasterWithLight<traster64p, tpixel64="">(</traster64p,>

            ras64, dim, bubbleColor, (TRaster64P)lightRas,

            (float)m_lightThres->getValue(frame),

            (float)m_lightIntensity->getValue(frame));

      else

        convertRaster<traster64p, tpixel64="">(ras64, dim, bubbleColor);</traster64p,>

    }

  }

  //メモリ解放

  // brightness_ras->unlock();

  bubbleColor_ras->unlock();

  if (lightRas) lightRas->unlock();

}

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

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

void Iwa_SpectrumFx::convertRaster(const RASTER ras, TDimensionI dim,

                                   float3 *bubbleColor) {

  float rr, gg, bb, aa;

  float spec_r, spec_g, spec_b;

  float brightness;

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

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

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

      aa = (float)pix->m / PIXEL::maxChannelValue;

      if (aa == 0.0f) /*- アルファが０なら変化なし -*/

      {

        pix++;

        continue;

      }

      /*- depremutiplyはしないでおく -*/

      rr         = (float)pix->r / (float)PIXEL::maxChannelValue;

      gg         = (float)pix->g / (float)PIXEL::maxChannelValue;

      bb         = (float)pix->b / (float)PIXEL::maxChannelValue;

      brightness = 0.298912f * rr + 0.586611f * gg + 0.114478f * bb;

      /*- 反転 -*/

      brightness = 1.0f - brightness;

      /*- 輝度MAXの場合 -*/

      if (brightness >= 1.0f) {

        spec_r = bubbleColor[255].x * aa;

        spec_g = bubbleColor[255].y * aa;

        spec_b = bubbleColor[255].z * aa;

      } else {

        /*- 線形補間する -*/

        int index   = (int)(brightness * 255.0f);

        float ratio = brightness * 255.0f - (float)index;

        spec_r = bubbleColor[index].x * (1.0f - ratio) +

                 bubbleColor[index + 1].x * ratio;

        spec_g = bubbleColor[index].y * (1.0f - ratio) +

                 bubbleColor[index + 1].y * ratio;

        spec_b = bubbleColor[index].z * (1.0f - ratio) +

                 bubbleColor[index + 1].z * ratio;

        spec_r *= aa;

        spec_g *= aa;

        spec_b *= aa;

      }

      /*- 元のピクセルに書き戻す -*/

      float val;

      /*- チャンネル範囲にクランプ -*/

      val    = spec_r * (float)PIXEL::maxChannelValue + 0.5f;

      pix->r = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)

                                             ? (float)PIXEL::maxChannelValue

                                             : val);

      val    = spec_g * (float)PIXEL::maxChannelValue + 0.5f;

      pix->g = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)

                                             ? (float)PIXEL::maxChannelValue

                                             : val);

      val    = spec_b * (float)PIXEL::maxChannelValue + 0.5f;

      pix->b = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)

                                             ? (float)PIXEL::maxChannelValue

                                             : val);

      pix++;

    }

  }

}

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

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

void Iwa_SpectrumFx::convertRasterWithLight(const RASTER ras, TDimensionI dim,

                                            float3 *bubbleColor,

                                            const RASTER lightRas,

                                            float lightThres,

                                            float lightIntensity) {

  float rr, gg, bb, aa;

  float spec_r, spec_g, spec_b;

  float brightness;

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

    PIXEL *light_pix = lightRas->pixels(j);

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

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

      aa = (float)light_pix->m / PIXEL::maxChannelValue;

      if (aa == 0.0f) /*- アルファが０なら透明にする -*/

      {

        *pix = PIXEL::Transparent;

        light_pix++;

        pix++;

        continue;

      }

      /*- depremutiplyはしないでおく -*/

      rr         = (float)pix->r / (float)PIXEL::maxChannelValue;

      gg         = (float)pix->g / (float)PIXEL::maxChannelValue;

      bb         = (float)pix->b / (float)PIXEL::maxChannelValue;

      brightness = 0.298912f * rr + 0.586611f * gg + 0.114478f * bb;

      /*- 反転 -*/

      brightness = 1.0f - brightness;

      /*- 輝度MAXの場合 -*/

      if (brightness >= 1.0f) {

        spec_r = bubbleColor[255].x;

        spec_g = bubbleColor[255].y;

        spec_b = bubbleColor[255].z;

      } else {

        /*- 線形補間する -*/

        int index   = (int)(brightness * 255.0f);

        float ratio = brightness * 255.0f - (float)index;

        spec_r = bubbleColor[index].x * (1.0f - ratio) +

                 bubbleColor[index + 1].x * ratio;

        spec_g = bubbleColor[index].y * (1.0f - ratio) +

                 bubbleColor[index + 1].y * ratio;

        spec_b = bubbleColor[index].z * (1.0f - ratio) +

                 bubbleColor[index + 1].z * ratio;

      }

      /*- ここで、Light画像とのスクリーン合成を行う -*/

      float HDR_Factor;

      if (aa <= lightThres || lightThres == 1.0f)

        HDR_Factor = 0.0;

      else

        HDR_Factor = lightIntensity * (aa - lightThres) / (1.0 - lightThres);

      float light_r = (float)light_pix->r / (float)PIXEL::maxChannelValue;

      float light_g = (float)light_pix->g / (float)PIXEL::maxChannelValue;

      float light_b = (float)light_pix->b / (float)PIXEL::maxChannelValue;

      /*- スクリーン合成結果と虹色をHDR_Factorで混ぜる -*/

      spec_r = (1.0f - HDR_Factor) * spec_r +

               HDR_Factor * (spec_r + light_r - spec_r * light_r);

      spec_g = (1.0f - HDR_Factor) * spec_g +

               HDR_Factor * (spec_g + light_g - spec_g * light_g);

      spec_b = (1.0f - HDR_Factor) * spec_b +

               HDR_Factor * (spec_b + light_b - spec_b * light_b);

      spec_r *= aa;

      spec_g *= aa;

      spec_b *= aa;

      /*- 元のピクセルに書き戻す -*/

      float val;

      /*- チャンネル範囲にクランプ -*/

      val    = spec_r * (float)PIXEL::maxChannelValue + 0.5f;

      pix->r = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)

                                             ? (float)PIXEL::maxChannelValue

                                             : val);

      val    = spec_g * (float)PIXEL::maxChannelValue + 0.5f;

      pix->g = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)

                                             ? (float)PIXEL::maxChannelValue

                                             : val);

      val    = spec_b * (float)PIXEL::maxChannelValue + 0.5f;

      pix->b = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)

                                             ? (float)PIXEL::maxChannelValue

                                             : val);

      pix->m = light_pix->m;

      pix++;

      light_pix++;

    }

  }

}

/*------------------------------------

 素材タイルを０〜１に正規化して格納

------------------------------------*/

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

void Iwa_SpectrumFx::setSourceRasters(const RASTER ras,

                                      float4 *in_out_tile_host,

                                      const RASTER light_ras,

                                      float4 *light_host, TDimensionI dim,

                                      bool useLight) {

  float4 *chann_p      = in_out_tile_host;

  float4 *lightChann_p = light_host;

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

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

    PIXEL *lightPix = (useLight) ? light_ras->pixels(j) : 0;

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

      (*chann_p).x = (float)pix->r / (float)PIXEL::maxChannelValue;

      (*chann_p).y = (float)pix->g / (float)PIXEL::maxChannelValue;

      (*chann_p).z = (float)pix->b / (float)PIXEL::maxChannelValue;

      (*chann_p).w = (float)pix->m / (float)PIXEL::maxChannelValue;

      pix++;

      chann_p++;

      if (useLight) {

        (*lightChann_p).x = (float)lightPix->r / (float)PIXEL::maxChannelValue;

        (*lightChann_p).y = (float)lightPix->g / (float)PIXEL::maxChannelValue;

        (*lightChann_p).z = (float)lightPix->b / (float)PIXEL::maxChannelValue;

        (*lightChann_p).w = (float)lightPix->m / (float)PIXEL::maxChannelValue;

        lightPix++;

        lightChann_p++;

      }

    }

  }

}

/*------------------------------------

 出力結果をChannel値に変換してタイルに格納

------------------------------------*/

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

void Iwa_SpectrumFx::outputRasters(const RASTER outRas,

                                   float4 *in_out_tile_host, TDimensionI dim) {

  float4 *chann_p = in_out_tile_host;

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

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

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

      float val;

      val    = (*chann_p).x * (float)PIXEL::maxChannelValue + 0.5f;

      pix->r = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)

                                             ? (float)PIXEL::maxChannelValue

                                             : val);

      val    = (*chann_p).y * (float)PIXEL::maxChannelValue + 0.5f;

      pix->g = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)

                                             ? (float)PIXEL::maxChannelValue

                                             : val);

      val    = (*chann_p).z * (float)PIXEL::maxChannelValue + 0.5f;

      pix->b = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)

                                             ? (float)PIXEL::maxChannelValue

                                             : val);

      val    = (*chann_p).w * (float)PIXEL::maxChannelValue + 0.5f;

      pix->m = (typename PIXEL::Channel)((val > (float)PIXEL::maxChannelValue)

                                             ? (float)PIXEL::maxChannelValue

                                             : val);

      pix++;

      chann_p++;

    }

  }

}

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

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

                               const TRenderSettings &info) {

  if (!m_input.isConnected()) {

    bBox = TRectD();

    return false;

  }

  return m_input->doGetBBox(frame, bBox, info);

}

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

bool Iwa_SpectrumFx::canHandle(const TRenderSettings &info, double frame) {

  return true;

}

FX_PLUGIN_IDENTIFIER(Iwa_SpectrumFx, "iwa_SpectrumFx")