TGLQuadric.cxx

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// @(#)root/gl:$Id$

/*************************************************************************
 * Copyright (C) 1995-2005, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

#include "TGLQuadric.h"
#include "TGLIncludes.h"
#include "TError.h"

/** \class TGLQuadric
\ingroup opengl
Wrapper class for GLU quadric shape drawing object. Lazy creation of
internal GLU raw quadric on first call to TGLQuadric::Get()
*/

ClassImp(TGLQuadric)

////////////////////////////////////////////////////////////////////////////////
/// Construct quadric

TGLQuadric::TGLQuadric() :
   fQuad(0)
{
}

////////////////////////////////////////////////////////////////////////////////
/// Destroy quadric

TGLQuadric::~TGLQuadric()
{
   if (fQuad) {
      gluDeleteQuadric(fQuad);
   }
}

////////////////////////////////////////////////////////////////////////////////
/// Get the internal raw GLU quadric object. Created on first call.

GLUquadric * TGLQuadric::Get()
{
   if (!fQuad) {
      fQuad = gluNewQuadric();
      if (!fQuad) {
         Error("TGLQuadric::Get", "create failed");
      } else {
         gluQuadricOrientation(fQuad, (GLenum)GLU_OUTSIDE);
         gluQuadricNormals(fQuad, (GLenum)GLU_SMOOTH);
      }
   }
   return fQuad;
}