EgtGraphics/ObjNewGraphics.cpp

//----------------------------------------------------------------------------
//  EgalTech 2014-2014
//----------------------------------------------------------------------------
// File : ObjNewGraphics.cpp       Data : 10.02.14          Versione : 1.5b1
// Contenuto : Implementazione della classe grafica di un oggetto geometrico.
//
//
//
// Modifiche : 10.02.14 DS Creazione modulo.
//
//
//----------------------------------------------------------------------------

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


//--------------------------- Macro ------------------------------------------
// Per funzioni glew dipendenti dal context
#define glewGetContext()    (( m_pScene != nullptr) ? m_pScene->glewGetContext() : nullptr)


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

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

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

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

//----------------------------------------------------------------------------
bool
ObjNewGraphics::AddPoint( const Point3d& ptP)
{
   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.x, ptP.y, ptP.z) ;
   glBufferSubData( GL_ARRAY_BUFFER, 0, SIZEV3F, &v3V) ;
   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) ;
  // dichiaro valida la grafica
   m_bValid = true ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ObjNewGraphics::AddPolyLine( const PolyLine& PL)
{
   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.x, ptP.y, ptP.z) ;
      glBufferSubData( GL_ARRAY_BUFFER, nCount * SIZEV3F, SIZEV3F, &v3V) ;
      ++ 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) ;
  // dichiaro valida la grafica
   m_bValid = true ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ObjNewGraphics::Draw( int nStat)
{
   if ( m_pScene == nullptr  ||  ! m_pScene->MakeCurrent())
      return false ;

  // gestione stato di visualizzazione
   if ( nStat == GDB_ST_OFF)
      return true ;
   if ( nStat == GDB_ST_SEL) {
      glPointSize( 5) ;
      glLineWidth( 3) ;
   }

  // ciclo di disegno
   NGALIST::iterator iIter ;
   for ( iIter = m_ngaList.begin() ; iIter != m_ngaList.end() ; ++ iIter) {
      switch ( iIter->m_nType) {
      case NewGrAtom::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 NewGrAtom::COLOR :
         glColor4f( iIter->m_fRed, iIter->m_fGreen, iIter->m_fBlue, iIter->m_fAlpha) ;
         break ;
      }
   }

  // se necessario, ripristino la normale visualizzazione
   if ( nStat == GDB_ST_SEL) {
      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 ==  NewGrAtom::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 ;
}