//=========================================================
//  MusE
//  Linux Music Editor
//  $Id: organ.cpp,v 1.15.2.8 2009/12/06 10:05:00 terminator356 Exp $
//
//  Parts of this file taken from:
//      Organ - Additive Organ Synthesizer Voice
//      Copyright (c) 1999, 2000 David A. Bartold
//
//  (C) Copyright 2001-2004 Werner Schweer (ws@seh.de)
//
//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the GNU General Public License
//  as published by the Free Software Foundation; version 2 of
//  the License, or (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//
//=========================================================

#include <stdio.h>

#include "muse_math.h"
#include "midi_consts.h"
#include "mpevent.h"

//#include "common_defs.h"
#include "organ.h"
#include "organgui.h"

//#define ORGAN_DEBUG

SynthCtrl Organ::synthCtrl[] = {
      { "harm0",     HARM0,          0 },
      { "harm1",     HARM1,          0 },
      { "harm2",     HARM2,          0 },
      { "harm3",     HARM3,          0 },
      { "harm4",     HARM4,          0 },
      { "harm5",     HARM5,          0 },
      { "attackLo",  ATTACK_LO,     20 },
      { "decayLo",   DECAY_LO,      20 },
      { "sustainLo", SUSTAIN_LO,     0 },
      { "releaseLo", RELEASE_LO,    20 },
      { "attackHi",  ATTACK_HI,     10 },
      { "decayHi",   DECAY_HI,      10 },
      { "sustainHi", SUSTAIN_HI,     0 },
      { "releaseHi", RELEASE_HI,    10 },
      { "brass",     BRASS,          1 },
      { "flute",     FLUTE,          1 },
      { "reed",      REED,           1 },
      { "velocity",  VELO,           0 },
      // next controller not send as init data
      { "volume",    MusECore::CTRL_VOLUME,  100 },
      };

static int NUM_CONTROLLER = sizeof(Organ::synthCtrl)/sizeof(*(Organ::synthCtrl));
static int NUM_INIT_CONTROLLER = NUM_CONTROLLER - 1;

float* Organ::sine_table;
float* Organ::g_triangle_table;
float* Organ::g_pulse_table;
int Organ::useCount = 0;
double Organ::cb2amp_tab[MAX_ATTENUATION];
unsigned Organ::freq256[128];

//---------------------------------------------------------
//   cb2amp
//    convert centibel to amplification (0 - 96dB)
//---------------------------------------------------------

double Organ::cb2amp(int cb)
      {
      if (cb < 0)
            return 1.0;
      if (cb >= MAX_ATTENUATION)
            return 0.0;
      return cb2amp_tab[cb];
      }

//---------------------------------------------------------
//   Organ
//---------------------------------------------------------

Organ::Organ(int sr)
   : Mess(1)
      {
      //idata = new int[NUM_CONTROLLER];
      idata = new unsigned char[3 + NUM_CONTROLLER * sizeof(int)];
      setSampleRate(sr);
      gui = 0;

      ++useCount;
      if (useCount > 1)
            return;

      // centibels to amplitude conversion
      for (int i = 0; i < MAX_ATTENUATION; i++)
            cb2amp_tab[i] = exp10(double(i) / -200.0);

      for (int i = 0; i < 128; ++i) {
            double freq = 8.176 * exp(double(i)*log(2.0)/12.0);
            freq256[i]  = (int) (freq * ((double) RESOLUTION) / sr * 256.0);
            }
      int size  = RESOLUTION;
      int half  = size / 2;
      int slope = size / 10;
      int i;

      // Initialize sine table.
      sine_table = new float[size];
      for (i = 0; i < size; i++)
            sine_table[i] = sin ((i * 2.0 * M_PI) / size) / 6.0;

      // Initialize triangle table.
      g_triangle_table = new float[size];
      for (i = 0; i < half; i++)
            g_triangle_table[i] = (4.0 / size * i - 1.0) / 6.0;
      for (; i < size; i++)
            g_triangle_table[i] = (4.0 / size * (size - i) - 1.0) / 6.0;

      // Initialize pulse table.
      g_pulse_table = new float[size];
      for (i = 0; i < slope; i++)
            g_pulse_table[i] = (((double) -i) / slope) / 6.0;
      for (; i < half - slope; i++)
            g_pulse_table[i] = -1.0 / 6.0;
      for (; i < half + slope; i++)
            g_pulse_table[i] = (((double) i - half) / slope) / 6.0;
      for (; i < size - slope; i++)
            g_pulse_table[i] = 1.0 / 6.0;
      for (; i < size; i++)
            g_pulse_table[i] = (((double) size - i) / slope) / 6.0;
      }

//---------------------------------------------------------
//   ~Organ
//---------------------------------------------------------

Organ::~Organ()
      {
      if (gui)
            delete gui;
      //delete idata;
      delete [] idata;   // p4.0.27
      --useCount;
      if (useCount == 0) {
            delete[] g_pulse_table;
            delete[] g_triangle_table;
            delete[] sine_table;
            }
      }

//---------------------------------------------------------
//   table_pos
//---------------------------------------------------------

static inline float table_pos (float* table, unsigned long freq_256, unsigned *accum)
      {
      *accum += freq_256;
      while (*accum >= RESOLUTION * 256)
            *accum -= RESOLUTION * 256;
      return table[*accum >> 8];
      }

//---------------------------------------------------------
//   init
//---------------------------------------------------------

bool Organ::init(const char* name)
      {
      gui = new OrganGui;
      gui->setWindowTitle(QString(name));
      gui->hide();

      for (int i = 0; i < NUM_CONTROLLER; ++i)
            setController(0, synthCtrl[i].num, synthCtrl[i].val);

      for (int i = 0; i < VOICES; ++i)
            voices[i].isOn = false;
      return false;
      }

int Organ::oldMidiStateHeader(const unsigned char** data) const 
{
  static unsigned char const d[3] = {MUSE_SYNTH_SYSEX_MFG_ID, ORGAN_UNIQUE_ID, INIT_DATA_CMD};
  *data = &d[0];
  return 3; 
}
        
//---------------------------------------------------------
//   processMessages
//   Called from host always, even if output path is unconnected.
//---------------------------------------------------------

void Organ::processMessages()
{
  //Process messages from the gui
  //
  //  get and process all pending events from the
  //  synthesizer GUI
  //
  while (gui->fifoSize()) 
  {
    MusECore::MidiPlayEvent ev = gui->readEvent();
    if (ev.type() == MusECore::ME_CONTROLLER) 
    {
      // process local?
      setController(ev.dataA(), ev.dataB());
      sendEvent(ev);
    }
    else
    {
      #ifdef ORGAN_DEBUG
      printf("Organ::process(): unknown event\n");
      #endif
    }  
  }
}
  
//---------------------------------------------------------
//   process
//   Called from host, ONLY if output path is connected.
//---------------------------------------------------------

void Organ::process(unsigned /*pos*/, float** ports, int /*numPorts*/, int offset, int sampleCount)
      {
      /*
      //
      //  get and process all pending events from the
      //  synthesizer GUI
      //
      while (gui->fifoSize()) {
            MusECore::MidiPlayEvent ev = gui->readEvent();
            if (ev.type() == MusECore::ME_CONTROLLER) {
                  // process local?
                  setController(ev.dataA(), ev.dataB());
                  sendEvent(ev);
                  }
            else
                  printf("Organ::process(): unknown event\n");
            }
      */
      
      float* buffer = *ports + offset;
      for (int i = 0; i < VOICES; ++i) {
            Voice* v = &voices[i];
            if (!v->isOn)
                  continue;
            double vol = velo ? v->velocity : 1.0;
            vol *= volume;

            unsigned freq_256 = freq256[v->pitch];
            unsigned* harm0_accum = &(v->harm0_accum);
            unsigned* harm1_accum = &(v->harm1_accum);
            unsigned* harm2_accum = &(v->harm2_accum);
            unsigned* harm3_accum = &(v->harm3_accum);
            unsigned* harm4_accum = &(v->harm4_accum);
            unsigned* harm5_accum = &(v->harm5_accum);

            unsigned long freq_256_harm2, freq_256_harm3;
            unsigned long freq_256_harm4, freq_256_harm5;

            float* reed_table  = reed  ? g_pulse_table    : sine_table;
            float* flute_table = flute ? g_triangle_table : sine_table;

            unsigned freq_256_harm0 = freq_256 / 2;
            unsigned freq_256_harm1 = freq_256;

            if (brass) {
                  freq_256_harm2 = freq_256       * 2;
                  freq_256_harm3 = freq_256_harm2 * 2;
                  freq_256_harm4 = freq_256_harm3 * 2;
                  freq_256_harm5 = freq_256_harm4 * 2;
                  for (int i = 0; i < sampleCount; i++) {
                        int a1=0, a2=0;	//prevent compiler warning: uninitialized usage of vars a1 & a2
                        switch(v->state1) {
                              case ATTACK:
                                    if (v->envL1.step(&a1))
                                          break;
                                    v->state1 = DECAY;
                                    // NOTE: Error suppressor for new gcc 7 'fallthrough' level 3 and 4:
                                    // FALLTHROUGH
                              case DECAY:
                                    if (v->envL2.step(&a1))
                                          break;
                                    v->state1 = SUSTAIN;
                                    // NOTE: Error suppressor for new gcc 7 'fallthrough' level 3 and 4:
                                    // FALLTHROUGH
                              case SUSTAIN:
                                    a1 = sustain0;
                                    break;
                              case RELEASE:
                                    if (v->envL3.step(&a1))
                                          break;
                                    v->state1 = OFF;
                                    a1 = MAX_ATTENUATION;
                                    break;
                              }
                        switch(v->state2) {
                              case ATTACK:
                                    if (v->envH1.step(&a2))
                                          break;
                                    v->state2 = DECAY;
                                    // NOTE: Error suppressor for new gcc 7 'fallthrough' level 3 and 4:
                                    // FALLTHROUGH
                              case DECAY:
                                    if (v->envH2.step(&a2))
                                          break;
                                    v->state2 = SUSTAIN;
                                    // NOTE: Error suppressor for new gcc 7 'fallthrough' level 3 and 4:
                                    // FALLTHROUGH
                              case SUSTAIN:
                                    a2 = sustain1;
                                    break;
                              case RELEASE:
                                    if (v->envH3.step(&a2))
                                          break;
                                    v->state2 = OFF;
                                    a1 = MAX_ATTENUATION;
                                    break;
                              }
                        if (v->state1 == OFF && v->state2 == OFF) {
                              v->isOn = false;
                              break;
                              }
                        buffer[i] +=
                            (table_pos (sine_table, freq_256_harm0, harm0_accum) * harm0
                           + table_pos (sine_table, freq_256_harm1, harm1_accum) * harm1
                           + table_pos (reed_table, freq_256_harm2, harm2_accum) * harm2)
                              * cb2amp(a1) * vol
                           + (table_pos (sine_table,  freq_256_harm3, harm3_accum) * harm3
                           +  table_pos (flute_table, freq_256_harm4, harm4_accum) * harm4
                           +  table_pos (flute_table, freq_256_harm5, harm5_accum) * harm5)
                             * cb2amp(a2) * vol;
                        }
                  }
            else {
                  freq_256_harm2 = freq_256 * 3 / 2;
                  freq_256_harm3 = freq_256 * 2;
                  freq_256_harm4 = freq_256 * 3;
                  freq_256_harm5 = freq_256_harm3 * 2;
                  for (int i = 0; i < sampleCount; i++) {
                        int a1=0, a2=0;//prevent compiler warning: uninitialized usage of vars a1 & a2
                        switch(v->state1) {
                              case ATTACK:
                                    if (v->envL1.step(&a1))
                                          break;
                                    v->state1 = DECAY;
                                    // NOTE: Error suppressor for new gcc 7 'fallthrough' level 3 and 4:
                                    // FALLTHROUGH
                              case DECAY:
                                    if (v->envL2.step(&a1))
                                          break;
                                    v->state1 = SUSTAIN;
                                    // FALLTHROUGH
                              case SUSTAIN:
                                    a1 = sustain0;
                                    break;
                              case RELEASE:
                                    if (v->envL3.step(&a1))
                                          break;
                                    v->state1 = OFF;
                                    a1 = MAX_ATTENUATION;
                                    break;
                              }
                        switch(v->state2) {
                              case ATTACK:
                                    if (v->envH1.step(&a2))
                                          break;
                                    v->state2 = DECAY;
                                    // FALLTHROUGH
                              case DECAY:
                                    if (v->envH2.step(&a2))
                                          break;
                                    v->state2 = SUSTAIN;
                                    // FALLTHROUGH
                              case SUSTAIN:
                                    a2 = sustain1;
                                    break;
                              case RELEASE:
                                    if (v->envH3.step(&a2))
                                          break;
                                    v->state2 = OFF;
                                    a1 = MAX_ATTENUATION;
                                    break;
                              }
                        if (v->state1 == OFF && v->state2 == OFF) {
                              v->isOn = false;
                              break;
                              }
                        buffer[i] +=
                           (table_pos (sine_table, freq_256_harm0, harm0_accum) * harm0
                           + table_pos (sine_table, freq_256_harm1, harm1_accum) * harm1
                           + table_pos (sine_table, freq_256_harm2, harm2_accum) * harm2)
                              * cb2amp(a1) * vol
                           + (table_pos (reed_table, freq_256_harm3, harm3_accum) * harm3
                           + table_pos (sine_table, freq_256_harm4,  harm4_accum) * harm4
                           + table_pos (flute_table, freq_256_harm5, harm5_accum) * harm5)
                             * cb2amp(a2) * vol;
                        }
                  }
            }
      }

//---------------------------------------------------------
//   playNote
//---------------------------------------------------------

bool Organ::playNote(int channel, int pitch, int velo)
      {
      if (velo == 0) {
            noteoff(channel, pitch);
            return false;
            }
      for (int i = 0; i < VOICES; ++i) {
            if (voices[i].isOn)
                  continue;
            voices[i].isOn     = true;
            voices[i].pitch    = pitch;
            voices[i].channel  = channel;
            // velo is never 0
            voices[i].velocity = cb2amp(int(200 * log10((127.0 * 127)/(velo*velo))));
            voices[i].state1 = ATTACK;
            voices[i].state2 = ATTACK;
            voices[i].envL1.set(attack0,  MAX_ATTENUATION, 0);
            voices[i].envL2.set(decay0,   MAX_ATTENUATION, sustain0);
            voices[i].envL3.set(release0, sustain0, MAX_ATTENUATION);

            voices[i].envH1.set(attack1,  MAX_ATTENUATION, 0);
            voices[i].envH2.set(decay1,   MAX_ATTENUATION, sustain1);
            voices[i].envH3.set(release1, sustain1, MAX_ATTENUATION);

            voices[i].harm0_accum = 0;
            voices[i].harm1_accum = 0;
            voices[i].harm2_accum = 0;
            voices[i].harm3_accum = 0;
            voices[i].harm4_accum = 0;
            voices[i].harm5_accum = 0;
            return false;
            }
      #ifdef ORGAN_DEBUG
      printf("organ: voices overflow!\n");
      #endif
      return false;
      }

//---------------------------------------------------------
//   noteoff
//---------------------------------------------------------

void Organ::noteoff(int channel, int pitch)
      {
      bool found = false;
      for (int i = 0; i < VOICES; ++i) {
            if (voices[i].isOn && (voices[i].pitch == pitch)
               && (voices[i].channel == channel)) {
                  found = true;
                  voices[i].state1 = RELEASE;
                  voices[i].state2 = RELEASE;
                  }
            }
      if (!found)
      {
            #ifdef ORGAN_DEBUG
            printf("Organ: noteoff %d:%d not found\n", channel, pitch);
            #endif
      }      
      }

//---------------------------------------------------------
//   setController
//---------------------------------------------------------

void Organ::setController(int ctrl, int data)
      {
      int sr = sampleRate();
      
      // Changed By T356.
      // Because of muse's auto-bias controllers, some of these negative-range 
      //  controls need to apply the auto-bias correction.
      
      switch (ctrl) {
            case HARM0:
                  //harm0 = cb2amp(-data);
                  harm0 = cb2amp(-data + 8192);
                  break;
            case HARM1:
                  //harm1 = cb2amp(-data);
                  harm1 = cb2amp(-data + 8192);
                  break;
            case HARM2:
                  //harm2 = cb2amp(-data);
                  harm2 = cb2amp(-data + 8192);
                  break;
            case HARM3:
                  //harm3 = cb2amp(-data);
                  harm3 = cb2amp(-data + 8192);
                  break;
            case HARM4:
                  //harm4 = cb2amp(-data);
                  harm4 = cb2amp(-data + 8192);
                  break;
            case HARM5:
                  //harm5 = cb2amp(-data);
                  harm5 = cb2amp(-data + 8192);
                  break;
            case ATTACK_LO:   // maxval -> 500msec
                  attack0 = (data * sr) / 1000;
                  break;
            case DECAY_LO:    // maxval -> 5000msec
                  decay0 = (data * sr) / 1000;
                  break;
            case SUSTAIN_LO:
                  //sustain0 = -data;
                  sustain0 = -data + 8192;
                  break;
            case RELEASE_LO:
                  release0 = (data * sr) / 1000;
                  break;
            case ATTACK_HI:
                  attack1 = (data * sr) / 1000;
                  break;
            case DECAY_HI:
                  decay1 =  (data * sr) / 1000;
                  break;
            case SUSTAIN_HI:
                  //sustain1 = -data;
                  sustain1 = -data + 8192;
                  break;
            case RELEASE_HI:
                  release1 = (data * sr) / 1000;
                  break;
            case BRASS:
                  brass = data;
                  break;
            case FLUTE:
                  flute = data;
                  break;
            case REED:
                  reed  = data;
                  break;
            case VELO:
                  velo = data;
                  break;
            case MusECore::CTRL_VOLUME:
                  data &= 0x7f;
                  volume = data == 0 ? 0.0 : cb2amp(int(200 * log10((127.0 * 127)/(data*data))));
                  break;
            case MusECore::CTRL_ALL_SOUNDS_OFF:
                  for (int i = 0; i < VOICES; ++i)
                        voices[i].isOn = false;
                  break;
            case MusECore::CTRL_RESET_ALL_CTRL:
                  for (int i = 0; i < NUM_CONTROLLER; ++i)
                        setController(0, synthCtrl[i].num, synthCtrl[i].val);
                  break;
            default:
                  #ifdef ORGAN_DEBUG
                  fprintf(stderr, "Organ:set unknown Ctrl 0x%x to 0x%x\n", ctrl, data);
                  #endif
                  return;
            }
      for (int i = 0; i < NUM_CONTROLLER; ++i) {
            if (synthCtrl[i].num == ctrl) {
                  synthCtrl[i].val = data;
                  break;
                  }
            }
      }

//---------------------------------------------------------
//   setController
//---------------------------------------------------------

bool Organ::setController(int channel, int ctrl, int data)
      {
      setController(ctrl, data);

      switch (ctrl) {
            case HARM0:
            case HARM1:
            case HARM2:
            case HARM3:
            case HARM4:
            case HARM5:
            case ATTACK_LO:
            case DECAY_LO:
            case SUSTAIN_LO:
            case RELEASE_LO:
            case ATTACK_HI:
            case DECAY_HI:
            case SUSTAIN_HI:
            case RELEASE_HI:
            case BRASS:
            case FLUTE:
            case REED:
            case VELO:
                  {
                  MusECore::MidiPlayEvent ev(0, 0, channel, MusECore::ME_CONTROLLER, ctrl, data);
                  #ifdef ORGAN_DEBUG
                  fprintf(stderr, "OrganGui:setController before gui->writeEvent ctrl:%d data:%d\n", ctrl, data);
                  #endif
            
                  gui->writeEvent(ev);
                  }
                  break;
            default:
                  break;
            }
      return false;
      }

//---------------------------------------------------------
//   sysex
//---------------------------------------------------------

bool Organ::sysex(int n, const unsigned char* data)
{
      #ifdef ORGAN_DEBUG
      printf("Organ: sysex\n");
      #endif
      
      // p4.0.27
      if(unsigned(n) == (3 + NUM_INIT_CONTROLLER * sizeof(int))) 
      {
        if (data[0] == MUSE_SYNTH_SYSEX_MFG_ID)        // MusE Soft Synth
        {
          if (data[1] == ORGAN_UNIQUE_ID)              // ORGAN
          {
            if (data[2] == INIT_DATA_CMD)              // Initialization
            {  
              int* s = (int*)(data + 3);
              for (int i = 0; i < NUM_INIT_CONTROLLER; ++i) 
              {
                    int val = *s++;
                    #ifdef ORGAN_DEBUG
                    printf("Organ: sysex before setController num:%d val:%d\n", synthCtrl[i].num, val);
                    #endif
                    setController(0, synthCtrl[i].num, val);
              }
              return false;
            }
          }
        }      
      }
      #ifdef ORGAN_DEBUG
      printf("Organ: unknown sysex\n");
      #endif
      return false;
}
//---------------------------------------------------------
//   getInitData
//---------------------------------------------------------

//void Organ::getInitData(int* n, const unsigned char**p) const
void Organ::getInitData(int* n, const unsigned char**p) 
{
      // p4.0.27
      *n = 3 + NUM_INIT_CONTROLLER * sizeof(int);
      idata[0] = MUSE_SYNTH_SYSEX_MFG_ID;           // MusE Soft Synth
      idata[1] = ORGAN_UNIQUE_ID;                   // ORGAN
      idata[2] = INIT_DATA_CMD;                     // Initialization
      int* d = (int*)&idata[3];
      
      //int* d = idata;
      for (int i = 0; i < NUM_INIT_CONTROLLER; ++i)
            *d++ = synthCtrl[i].val;
      //*n = NUM_INIT_CONTROLLER * sizeof(int); // sizeof(idata);
      *p = (unsigned char*)idata;
}

//---------------------------------------------------------
//   MESS
//---------------------------------------------------------

//---------------------------------------------------------
//   getControllerInfo
//---------------------------------------------------------

int Organ::getControllerInfo(int id, const char** name, int* controller,
   int* min, int* max, int* initval) const
      {
      if (id >= NUM_CONTROLLER)
            return 0;
      *controller = synthCtrl[id].num;
      *name       = synthCtrl[id].name;
      *initval    = synthCtrl[id].val;
      
      if(synthCtrl[id].num == MusECore::CTRL_VOLUME)
      {
        *min = 0;
        *max = 127;
      }
      else
        gui->getControllerMinMax(id,min,max);
      
      //*min        = 0;
      //*max        = 128*128-1;
      return ++id;
      }

//---------------------------------------------------------
//   nativeGuiVisible
//---------------------------------------------------------

bool Organ::nativeGuiVisible() const
      {
      return gui->isVisible();
      }

//---------------------------------------------------------
//   showNativeGui
//---------------------------------------------------------

void Organ::showNativeGui(bool val)
      {
      gui->setVisible(val);
      }

//---------------------------------------------------------
//   getNativeGeometry
//---------------------------------------------------------

void Organ::getNativeGeometry(int* x, int* y, int* w, int* h) const
      {
      QPoint pos(gui->pos());
      QSize size(gui->size());
      *x = pos.x();
      *y = pos.y();
      *w = size.width();
      *h = size.height();
      }

//---------------------------------------------------------
//   setNativeGeometry
//---------------------------------------------------------

void Organ::setNativeGeometry(int x, int y, int w, int h)
      {
      gui->resize(QSize(w, h));
      gui->move(QPoint(x, y));
      }

//---------------------------------------------------------
//   instantiate
//    construct a new synthesizer instance
//---------------------------------------------------------

static Mess* instantiate(unsigned long long /*parentWinId*/, const char* name, const MessConfig* config)
      {
      Organ* synth = new Organ(config->_sampleRate);
      if (synth->init(name)) {
            delete synth;
            synth = 0;
            }
      return synth;
      }

//---------------------------------------------------------
//   msynth_descriptor
//    Return a descriptor of the requested plugin type.
//---------------------------------------------------------

extern "C" {
      static MESS descriptor = {
            "Organ",
            "Organ based on David A. Bartold's LADSPA plugin",
            "0.1",      // version string
            MESS_MAJOR_VERSION, MESS_MINOR_VERSION,
            instantiate,
            };
      // We must compile with -fvisibility=hidden to avoid namespace
      // conflicts with global variables.
      // Only visible symbol is "mess_descriptor".
      // (TODO: all plugins should be compiled this way)
  
      __attribute__ ((visibility("default")))
      const MESS* mess_descriptor() { return &descriptor; }
      }

