Function CalcLuminance

examples/LuminescentGrand/shared/Painter.cpp:40–73

}

float CalcLuminance(float time_delta_ms,
                    bool sustain_pedal_on,
                    const Key& key,
                    int key_idx) {
                             
  if (key.mCurrColor.v_ <= 0.0) {
    return 0.0;
  }

  const bool dampened_key = (key_idx < kFirstNoteNoDamp);

  const float decay_factor = CalcDecayFactor(sustain_pedal_on,
                                             key.mOn,
                                             key_idx,
                                             key.mVelocity * (1.f/127.f),  // Normalizing
                                             dampened_key,
                                             time_delta_ms);

  if (key.mOn) {
    //const float brigthness_factor = sin(key.mOrigColor.v_ * PI / 2.0);
    float brigthness_factor = 0.0f;

    if (kUseLedCurtin) {
      brigthness_factor = fl::sqrt(fl::sqrt(key.mOrigColor.v_));
    } else {
      //brigthness_factor = key.mOrigColor.v_ * key.mOrigColor.v_;
      brigthness_factor = key.mOrigColor.v_;
    }
    return LuminanceDecay(decay_factor) * brigthness_factor;
    //return 1.0f;
  } else {
    return decay_factor * key.mOrigColor.v_;
  }
}

float CalcSaturation(float time_delta_ms, const ColorHSV& color, bool key_on) {
  if (color.v_ <= 0.0) {