//----------------------------------------------------------------------------
//  EgalTech 2014-2014
//----------------------------------------------------------------------------
// File : ObjNewGraphics.cpp       Data : 23.04.14          Versione : 1.5d5
// Contenuto : Implementazione della classe grafica di un oggetto geometrico.
//
//
//
// Modifiche : 10.02.14 DS Creazione modulo.
//             23.04.14 DS Agg. gestione materiali.
//
//----------------------------------------------------------------------------

//--------------------------- Include ----------------------------------------
#include "stdafx.h"
#include "ObjNewGraphics.h"
#include "Scene.h"
#include "GraphObjs.h"
#include "/EgtDev/Include/EGkPolyLine.h"
#include "/EgtDev/Include/EGkGdbConst.h"
#include "/EgtDev/Include/EGKTriangle3d.h"


//--------------------------- Macro e Costanti -------------------------------
// Per funzioni glew dipendenti dal context
#define glewGetContext()    (( m_pScene != nullptr) ? m_pScene->glewGetContext() : nullptr)
// Dimensioni flag per edge di triangoli
const size_t SIZEFLAG = sizeof( unsigned char) ;
// Dimensioni record del buffer ( vertice + normale + flag)
const size_t SIZEVNF = ( 2 * SIZEV3F + SIZEFLAG) ;

//----------------------------------------------------------------------------
ObjNewGraphics::~ObjNewGraphics( void)
{
   Clear() ;
}

//----------------------------------------------------------------------------
void
ObjNewGraphics::Reset( void)
{
   m_bValid = false ;
   m_nCurrMode = GL_NONE ;
}

//----------------------------------------------------------------------------
void
ObjNewGraphics::Clear( void)
{
   DeleteVaoVbo() ;
   m_ngaList.clear() ;
   m_bValid = false ;
   m_nCurrMode = GL_NONE ;
}

//----------------------------------------------------------------------------
bool
ObjNewGraphics::AddColor( const Color& colC)
{
   return AddColor( colC.GetRed(), colC.GetGreen(), colC.GetBlue(), colC.GetAlpha()) ;
}

//----------------------------------------------------------------------------
bool
ObjNewGraphics::AddMaterial( const Color& colAmb, const Color& colDiff,
                             const Color& colSpec, float fShin)
{
   return AddMaterial( NgAtom::MAT_A, colAmb.GetRed(), colAmb.GetGreen(),
                                      colAmb.GetBlue(), colDiff.GetAlpha()) &&
          AddMaterial( NgAtom::MAT_D, colDiff.GetRed(), colDiff.GetGreen(),
                                      colDiff.GetBlue(), colDiff.GetAlpha()) &&
          AddMaterial( NgAtom::MAT_S, colSpec.GetRed(), colSpec.GetGreen(),
                                      colSpec.GetBlue(), colDiff.GetAlpha()) &&
          AddMaterial( NgAtom::MAT_SH, fShin, 0, 0, 0) ;
}

//----------------------------------------------------------------------------
bool
ObjNewGraphics::AddBackMaterial( const Color& colAmbDiff)
{
   return AddMaterial( NgAtom::MAT_B, colAmbDiff.GetRed(), colAmbDiff.GetGreen(),
                                      colAmbDiff.GetBlue(), colAmbDiff.GetAlpha()) ;
}

//----------------------------------------------------------------------------
bool
ObjNewGraphics::AddPoint( const Point3d& ptP, bool bAux)
{
   if ( m_pScene == nullptr  ||  ! m_pScene->MakeCurrent())
      return false ;
  // definisco i buffer per la scheda grafica e vi inserisco i nuovi vertici
   unsigned int nVaoId ;
   glGenVertexArrays( 1, &nVaoId) ;
   if ( nVaoId == 0)
      return false ;
   glBindVertexArray( nVaoId) ;
   unsigned int nVboId ;
   glGenBuffers( 1, &nVboId) ;
   if ( nVboId == 0) {
      glBindVertexArray( 0) ;
      glDeleteVertexArrays( 1, &nVaoId) ;
      return false ;
   }
   glBindBuffer( GL_ARRAY_BUFFER, nVboId) ;
   glBufferData( GL_ARRAY_BUFFER, 1 * SIZEV3F, NULL, GL_STATIC_DRAW) ;
   Vert3f  v3V( ptP) ;
   glBufferSubData( GL_ARRAY_BUFFER, 0, SIZEV3F, &v3V) ;
   m_b3Loc.Add( ptP) ;
   int nCount = 1 ;
   glVertexPointer( 3, GL_FLOAT, 0, ((void*)(0))) ;
   glEnableClientState( GL_VERTEX_ARRAY) ;
   glBindVertexArray( 0) ;
  // aggiungo i dati in lista
   AddVerts( GL_POINTS, nCount, nVaoId, nVboId, bAux) ;
  // dichiaro valida la grafica
   m_bValid = true ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ObjNewGraphics::AddLines( const PNTVECTOR& vPnt, bool bAux)
{
   if ( m_pScene == nullptr  ||  ! m_pScene->MakeCurrent())
      return false ;
  // definisco i buffer per la scheda grafica e vi inserisco i nuovi vertici
   unsigned int nVaoId ;
   glGenVertexArrays( 1, &nVaoId) ;
   if ( nVaoId == 0)
      return false ;
   glBindVertexArray( nVaoId) ;
   unsigned int nVboId ;
   glGenBuffers( 1, &nVboId) ;
   if ( nVboId == 0) {
      glBindVertexArray( 0) ;
      glDeleteVertexArrays( 1, &nVaoId) ;
      return false ;
   }
   glBindBuffer( GL_ARRAY_BUFFER, nVboId) ;
   int nCount = int( vPnt.size()) ;
   glBufferData( GL_ARRAY_BUFFER, nCount * SIZEV3F, NULL, GL_STATIC_DRAW) ;
   Vert3f  v3V ;
   for ( int i = 0 ; i < nCount ; ++ i) {
      v3V.Set( vPnt[i]) ;
      glBufferSubData( GL_ARRAY_BUFFER, i * SIZEV3F, SIZEV3F, &v3V) ;
      m_b3Loc.Add( vPnt[i]) ;
   }
   glVertexPointer( 3, GL_FLOAT, 0, ((void*)(0))) ;
   glEnableClientState( GL_VERTEX_ARRAY) ;
   glBindVertexArray( 0) ;
  // aggiungo i dati in lista
   AddVerts( GL_LINES, nCount, nVaoId, nVboId, bAux) ;
  // dichiaro valida la grafica
   m_bValid = true ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ObjNewGraphics::AddPolyLine( const PolyLine& PL, bool bAux)
{
   if ( m_pScene == nullptr  ||  ! m_pScene->MakeCurrent())
      return false ;
  // definisco i buffer per la scheda grafica e vi inserisco i nuovi vertici
   unsigned int nVaoId ;
   glGenVertexArrays( 1, &nVaoId) ;
   if ( nVaoId == 0)
      return false ;
   glBindVertexArray( nVaoId) ;
   unsigned int nVboId ;
   glGenBuffers( 1, &nVboId) ;
   if ( nVboId == 0) {
      glBindVertexArray( 0) ;
      glDeleteVertexArrays( 1, &nVaoId) ;
      return false ;
   }
   glBindBuffer( GL_ARRAY_BUFFER, nVboId) ;
   glBufferData( GL_ARRAY_BUFFER, PL.GetPointNbr() * SIZEV3F, NULL, GL_STATIC_DRAW) ;
   Point3d ptP ;
   Vert3f  v3V ;
   int nCount = 0 ;
   for ( bool bFound = PL.GetFirstPoint( ptP) ; bFound ; bFound = PL.GetNextPoint( ptP)) {
      v3V.Set( ptP) ;
      glBufferSubData( GL_ARRAY_BUFFER, nCount * SIZEV3F, SIZEV3F, &v3V) ;
      m_b3Loc.Add( ptP) ;
      ++ nCount ;
   }
   glVertexPointer( 3, GL_FLOAT, 0, ((void*)(0))) ;
   glEnableClientState( GL_VERTEX_ARRAY) ;
   glBindVertexArray( 0) ;
  // aggiungo i dati in lista
   AddVerts( GL_LINE_STRIP, nCount, nVaoId, nVboId, bAux) ;
  // dichiaro valida la grafica
   m_bValid = true ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ObjNewGraphics::StartTriangles( int nNum, bool bAux)
{
   if ( m_pScene == nullptr  ||  ! m_pScene->MakeCurrent())
      return false ;
  // modo corrente deve essere nullo
   if ( m_nCurrMode != GL_NONE)
      return false ;
  // inizializzo emissione triangoli
   unsigned int nVaoId ;
   glGenVertexArrays( 1, &nVaoId) ;
   if ( nVaoId == 0)
      return false ;
   glBindVertexArray( nVaoId) ;
   unsigned int nVboId ;
   glGenBuffers( 1, &nVboId) ;
   if ( nVboId == 0) {
      glBindVertexArray( 0) ;
      glDeleteVertexArrays( 1, &nVaoId) ;
      return false ;
   }
   glBindBuffer( GL_ARRAY_BUFFER, nVboId) ;
   // NumTria * 3 * dimensione( vertice+normale+flag)
   glBufferData( GL_ARRAY_BUFFER, nNum * 3 * SIZEVNF, NULL, GL_STATIC_DRAW) ;
  // aggiungo i dati in lista
   AddVerts( GL_TRIANGLES, 0, nVaoId, nVboId, bAux) ;
  // dichiaro modo triangoli
   m_nCurrMode = GL_TRIANGLES ;
   return true ;
}

//----------------------------------------------------------------------------
bool
ObjNewGraphics::AddTriangle( const Triangle3d& Tria, const TriFlags3d& TFlags, const TriNormals3d& TNrms)
{
   if ( m_pScene == nullptr  ||  ! m_pScene->MakeCurrent())
      return false ;
  // modo corrente deve essere triangoli
   if ( m_nCurrMode != GL_TRIANGLES)
      return false ;
  // recupero il conteggio dei vertici
   int nCount = m_ngaList.back().m_nCount ;
  // emetto i vertici, le normali e i flag del triangolo
   #pragma pack( push, 1)
   struct VnfBuf {
      Vert3f v3V ;
      Vert3f v3N ;
      unsigned char cFlag ;
   } ;
   #pragma pack( pop)
   VnfBuf Buffer[3] ;
   for ( int i = 0 ; i < 3 ; ++ i) {
      Buffer[i].v3V = Tria.GetP( i) ;
      Buffer[i].v3N = TNrms.vtN[i] ;
      Buffer[i].cFlag = ( TFlags.bFlag[i] ? 1 : 0) ;
   }
   glBufferSubData( GL_ARRAY_BUFFER, nCount * SIZEVNF, 3 * SIZEVNF, Buffer) ;
  // aggiorno il conteggio
   nCount += 3 ;
   m_ngaList.back().m_nCount = nCount ;
  // aggiorno bbox
   for ( int i = 0 ; i < 3 ; ++ i)
      m_b3Loc.Add( Tria.GetP( i)) ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ObjNewGraphics::EndTriangles( void)
{
   if ( m_pScene == nullptr  ||  ! m_pScene->MakeCurrent())
      return false ;
  // modo corrente deve essere triangoli
   if ( m_nCurrMode != GL_TRIANGLES)
      return false ;
  // termino il modo triangoli
   glVertexPointer( 3, GL_FLOAT, SIZEVNF, ((void*)(0))) ;
   glEnableClientState( GL_VERTEX_ARRAY) ;
   glNormalPointer( GL_FLOAT, SIZEVNF, ((void*)( 1 * SIZEV3F))) ;
   glEnableClientState( GL_NORMAL_ARRAY) ;
   glEdgeFlagPointer( SIZEVNF, ((void*)( 2 * SIZEV3F))) ;
   glEnableClientState( GL_EDGE_FLAG_ARRAY) ;
   glBindVertexArray( 0) ;
  // dichiaro modalità standard
   m_nCurrMode = GL_NONE ;
  // dichiaro valida la grafica
   m_bValid = true ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ObjNewGraphics::Draw( int nStat, int nMark, bool bSurfSha, int nAlpha, bool bShowAux)
{
   if ( ! m_bValid  ||  m_pScene == nullptr  ||  ! m_pScene->MakeCurrent())
      return false ;

  // se vuoto non faccio alcunché
   if ( m_ngaList.size() == 0)
      return true ;

  // gestione stato di visualizzazione
   if ( nStat == GDB_ST_OFF)
      return true ;
   if ( nStat == GDB_ST_SEL) {
      glPointSize( 5) ;
      glLineWidth( 2) ;
   }

  // colori speciali per superficie shading selezionata o marcata
   bool bStdCol = true ;
   float fSelMarkCol[4] = { 1, 1, 1, 1} ;
   float fSelMarkBackCol[4] = { 0.75, 0.75, 0.75, 1} ;
   if ( bSurfSha) {
      if ( nMark == GDB_MK_ON) {
         bStdCol = false ;
         Color colMark = ( ( GetScene() != nullptr) ? GetScene()->GetMark() : Color( 192, 192, 0)) ;
         colMark.SetAlpha( nAlpha) ;
         colMark.GetFloat( fSelMarkCol) ;
         Color colMarkBack = GetSurfBackColor( colMark) ;
         colMarkBack.SetAlpha( nAlpha) ;
         colMarkBack.GetFloat( fSelMarkBackCol) ;
      }
      else if ( nStat == GDB_ST_SEL) {
         bStdCol = false ;
         Color colSelSurf = ( ( GetScene() != nullptr) ? GetScene()->GetSelSurf() : Color( 255, 255, 192)) ;
         colSelSurf.SetAlpha( nAlpha) ;
         colSelSurf.GetFloat( fSelMarkCol) ;
         Color colSelSurfBack = GetSurfBackColor( colSelSurf) ;
         colSelSurfBack.SetAlpha( nAlpha) ;
         colSelSurfBack.GetFloat( fSelMarkBackCol) ;
      }
   }

  // ciclo di disegno
   NGALIST::iterator iIter ;
   for ( iIter = m_ngaList.begin() ; iIter != m_ngaList.end() ; ++ iIter) {
      switch ( iIter->m_nType) {
      case NgAtom::VERTS :
         if ( iIter->m_nCount > 0  &&  iIter->m_nVaoId != 0) {
            glBindVertexArray( iIter->m_nVaoId) ; 
            glDrawArrays( iIter->m_nMode, 0, iIter->m_nCount) ;
            glBindVertexArray( 0) ;
         }
         break ;
      case NgAtom::VERTS_A :
         if ( bShowAux  &&  iIter->m_nCount > 0  &&  iIter->m_nVaoId != 0) {
            glBindVertexArray( iIter->m_nVaoId) ; 
            glDrawArrays( iIter->m_nMode, 0, iIter->m_nCount) ;
            glBindVertexArray( 0) ;
         }
         break ;
      case NgAtom::COLOR :
         glColor4fv( ( bStdCol ? iIter->m_fCol : fSelMarkCol)) ;
         break ;
      case NgAtom::MAT_A :
         glMaterialfv( GL_FRONT, GL_AMBIENT, ( bStdCol ? iIter->m_fCol : fSelMarkCol)) ;
         break ;
      case NgAtom::MAT_D :
         glMaterialfv( GL_FRONT, GL_DIFFUSE, ( bStdCol ? iIter->m_fCol : fSelMarkCol)) ;
         break ;
      case NgAtom::MAT_S :
         glMaterialfv( GL_FRONT, GL_SPECULAR, ( bStdCol ? iIter->m_fCol : fSelMarkCol)) ;
         break ;
      case NgAtom::MAT_SH :
         glMaterialf( GL_FRONT, GL_SHININESS, iIter->m_fCol[0]) ;
         break ;
      case NgAtom::MAT_B :
         glMaterialfv( GL_BACK, GL_AMBIENT_AND_DIFFUSE, ( bStdCol ? iIter->m_fCol : fSelMarkBackCol)) ;
         break ;
      }
   }

  // se marcato e non superficie in shading, disegno halo
   if ( nMark == GDB_MK_ON  &&  ! bSurfSha) {
     // cambio test di depth per non sovrascrivere il disegno appena fatto
      glDepthFunc( GL_LESS) ;

     // dimensioni per halo
      glPointSize( 7) ;
      glLineWidth( 4) ;

     // colore di marcatura
      Color colMark = ( ( GetScene() != nullptr) ? GetScene()->GetMark() : Color( 192, 192, 0)) ;
      glColor4f( colMark.GetRed(), colMark.GetGreen(), colMark.GetBlue(), colMark.GetAlpha()) ;

     // ciclo di disegno
      NGALIST::iterator iIter ;
      for ( iIter = m_ngaList.begin() ; iIter != m_ngaList.end() ; ++ iIter) {
         switch ( iIter->m_nType) {
         case NgAtom::VERTS :
            if ( iIter->m_nCount > 0  &&  iIter->m_nVaoId != 0) {
               glBindVertexArray( iIter->m_nVaoId) ; 
               glDrawArrays( iIter->m_nMode, 0, iIter->m_nCount) ;
               glBindVertexArray( 0) ;
            }
            break ;
         case NgAtom::VERTS_A :
            if ( bShowAux  &&  iIter->m_nCount > 0  &&  iIter->m_nVaoId != 0) {
               glBindVertexArray( iIter->m_nVaoId) ; 
               glDrawArrays( iIter->m_nMode, 0, iIter->m_nCount) ;
               glBindVertexArray( 0) ;
            }
            break ;
         // non si impostano i colori, si usa quello di marcatura
         }
      }
     // ripristino test di depth
      glDepthFunc( GL_LEQUAL) ;
   }

  // se necessario, ripristino la normale visualizzazione
   if ( nStat == GDB_ST_SEL  ||  nMark == GDB_MK_ON) {
      glPointSize( 3) ;
      glLineWidth( 1) ;
   }

   return true ;
}

//----------------------------------------------------------------------------
bool
ObjNewGraphics::DeleteVaoVbo( void)
{
   if ( m_pScene == nullptr  ||  ! m_pScene->MakeCurrent())
      return false ;

  // ciclo di cancellazione VAO/VBO
   NGALIST::iterator iIter ;
   for ( iIter = m_ngaList.begin() ; iIter != m_ngaList.end() ; ++ iIter) {
      if ( iIter->m_nType ==  NgAtom::VERTS  &&  iIter->m_nCount > 0) {
         glBindBuffer( GL_ARRAY_BUFFER, 0) ;
         glDeleteBuffers( 1, &iIter->m_nVboId) ;
         glBindVertexArray( 0) ;
         glDeleteVertexArrays( 1, &iIter->m_nVaoId) ;
         iIter->m_nCount = 0 ;
      }
   }

   return true ;
}