QtBaseViewer.cc 72.5 KB
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/*===========================================================================*\
*                                                                            *
*                              OpenFlipper                                   *
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*      Copyright (C) 2001-2014 by Computer Graphics Group, RWTH Aachen       *
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*                           www.openflipper.org                              *
*                                                                            *
*--------------------------------------------------------------------------- *
*  This file is part of OpenFlipper.                                         *
*                                                                            *
*  OpenFlipper is free software: you can redistribute it and/or modify       *
*  it under the terms of the GNU Lesser General Public License as            *
*  published by the Free Software Foundation, either version 3 of            *
*  the License, or (at your option) any later version with the               *
*  following exceptions:                                                     *
*                                                                            *
*  If other files instantiate templates or use macros                        *
*  or inline functions from this file, or you compile this file and          *
*  link it with other files to produce an executable, this file does         *
*  not by itself cause the resulting executable to be covered by the         *
*  GNU Lesser General Public License. This exception does not however        *
*  invalidate any other reasons why the executable file might be             *
*  covered by the GNU Lesser General Public License.                         *
*                                                                            *
*  OpenFlipper 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 Lesser General Public License for more details.                       *
*                                                                            *
*  You should have received a copy of the GNU LesserGeneral Public           *
*  License along with OpenFlipper. If not,                                   *
*  see <http://www.gnu.org/licenses/>.                                       *
*                                                                            *
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\*===========================================================================*/

/*===========================================================================*\
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*                                                                            *
*   $Revision$                                                       *
*   $LastChangedBy$                                                *
*   $Date$                     *
*                                                                            *
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\*===========================================================================*/
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//=============================================================================
//
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//  CLASS glViewer - IMPLEMENTATION
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//
//=============================================================================


//== INCLUDES =================================================================

#include "QtBaseViewer.hh"
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#include "QtGLViewerLayout.hh"
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#include "CursorPainter.hh"
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#include <ACG/QtWidgets/QtWheel.hh>
#include <ACG/Scenegraph/DrawModes.hh>
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#include <ACG/Scenegraph/CoordsysNode.hh>
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#include <ACG/Scenegraph/SceneGraphAnalysis.hh>
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#include <ACG/GL/gl.hh>
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#include <ACG/GL/GLError.hh>
#include <ACG/GL/FBO.hh>
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#include <ACG/GL/IRenderer.hh>
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#include <iostream>
#include <string>
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#include <cassert>
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#include <QGLFormat>
#include <QBoxLayout>
#include <QtNetwork/QUdpSocket>
#include <QWheelEvent>
#include <QDropEvent>
#include <QContextMenuEvent>
#include <QDragEnterEvent>
#include <QMouseEvent>
#include <QAction>
#include <QKeyEvent>
#include <QSize>
#include <QMap>
#include <QString>
#include <QMenu>
#include <QToolBar>
#include <QTime>
#include <QTimer>
#include <QGraphicsWidget>
#include <QGraphicsSceneDragDropEvent>
#include <QPropertyAnimation>

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#include <QMimeData>
#include <QToolButton>
#include <QFrame>

#include <QClipboard>
#include <QApplication>
#include <QSplitter>
#include <QLayout>
#include <QPushButton>
#include <QLabel>
#include <QImage>
#include <QColorDialog>
#include <QToolTip>
#include <QTextStream>
#include <QDateTime>
#include <QTimer>

#include <QDesktopWidget>
#include <QMouseEvent>
#include <QVBoxLayout>
#include <QKeyEvent>
#include <QGridLayout>
#include <QContextMenuEvent>
#include <QWheelEvent>
#include <QDropEvent>
#include <QPixmap>
#include <QMenu>
#include <QVariant>
#include <QButtonGroup>
#include <QToolBar>

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#include <QGraphicsView>
#include <QGraphicsScene>
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#include <QGraphicsWidget>
#include <QGraphicsGridLayout>
#include <QGraphicsProxyWidget>
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#include <QPainter>
#include <QPaintEngine>
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#include <QImageWriter>

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#if QT_VERSION < 0x050000
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#include <QGLFramebufferObject>
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#else
#include <QOpenGLFramebufferObject>
#endif
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#ifdef max
#  undef max
#endif

#ifdef min
#  undef min
#endif

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#include <OpenFlipper/BasePlugin/PluginFunctions.hh>
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#include <OpenFlipper/common/ViewObjectMarker.hh>
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#include <OpenFlipper/common/GlobalOptions.hh>

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#include <OpenFlipper/common/RendererInfo.hh>
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#include <OpenFlipper/BasePlugin/PostProcessorInterface.hh>

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//== NAMESPACES ===============================================================



//== IMPLEMENTATION ==========================================================

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static const char          COPY_PASTE_VIEW_START_STRING[] =
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  "ACG::QtWidgets::QGLViewerWidget encoded view";

//== IMPLEMENTATION ==========================================================


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glViewer::glViewer( QGraphicsScene* _scene,
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                    QGLWidget* _glWidget,
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                    Viewer::ViewerProperties& _properties,
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                    QGraphicsWidget* _parent) :
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  QGraphicsWidget(_parent),
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  glareaGrabbed_(false),
  projectionUpdateLocked_(false),
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  glScene_(_scene),
  glWidget_(_glWidget),
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  pickCache_(0),
  updatePickCache_(true),
  pickCacheSupported_(true),
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  constrainedRotationAxis_(std::numeric_limits<double>::quiet_NaN(), 0, 0),
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  clickEvent_(QEvent::MouseButtonPress, QPoint (), Qt::NoButton, Qt::NoButton, Qt::NoModifier),
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  properties_(_properties),
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  glstate_(0),
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  initialized_(false),
  flyAnimationPerspective_(0),
  flyAnimationOrthogonal_(0),
  flyAngle_(0.0),
  currentAnimationPos_(0.0),
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  flyMoveBack_(false)
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{

  // widget stuff
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  createWidgets();
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  // bind GL context to GL state class
  glstate_ = new ACG::GLState();
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  properties_.setglState( glstate_ );

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  // state
  isRotating_       = false;
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  lookAround_       = false;
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  sceneGraphRoot_   = 0;

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  normalsMode_      = NORMALIZE_NORMALS;
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  projectionMode_   = PERSPECTIVE_PROJECTION;
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  navigationMode_   = NORMAL_NAVIGATION;
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  trackMouse_ = false;

  // Note: we start locked (initialization of updateLocked_)
  // will be unlocked in initializeGL()

  QSizePolicy sp = sizePolicy();
  sp.setHorizontalPolicy( QSizePolicy::Expanding );
  sp.setVerticalPolicy( QSizePolicy::Expanding );
  sp.setHorizontalStretch( 1 );
  sp.setVerticalStretch( 1 );
  setSizePolicy( sp );

  redrawTime_.start ();

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  // timer for animation
  timer_ = new QTimer( this );
  connect( timer_, SIGNAL(timeout()), this, SLOT( slotAnimation()) );

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  fovyModifier_ = 1.0;

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  allowRotation_ = true;


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  connect( &properties_,SIGNAL(updated()), this, SLOT( slotPropertiesUpdated() ) );


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  //check for updated properties once
  slotPropertiesUpdated();

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  setAcceptDrops(true);
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  setHome();
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  clickTimer_.setSingleShot (true);
  connect (&clickTimer_, SIGNAL(timeout ()), this, SLOT(slotClickTimeout ()));
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}


//-----------------------------------------------------------------------------


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glViewer::~glViewer()
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{
  delete glstate_;
}


//-----------------------------------------------------------------------------


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//QSizeF
//glViewer::sizeHint(Qt::SizeHint which, const QSizeF & constraint) const
//{
//  return QSizeF( 600, 600 );
//}
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//-----------------------------------------------------------------------------


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void glViewer::makeCurrent() {
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  glWidget_->makeCurrent();
}

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void glViewer::swapBuffers() {
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  glWidget_->swapBuffers();
}


//-----------------------------------------------------------------------------

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void glViewer::sceneGraph(ACG::SceneGraph::BaseNode* _root,
                          unsigned int               _maxPasses,
                          ACG::Vec3d                 _bbmin,
                          ACG::Vec3d                 _bbmax,
                          const bool _resetTrackBall)
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{
  sceneGraphRoot_ = _root;

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  if (sceneGraphRoot_ )
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  {

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    // set max number of render pass
    glstate_->set_max_render_passes(_maxPasses);
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    if ( ( _bbmin[0] > _bbmax[0] ) ||
         ( _bbmin[1] > _bbmax[1] ) ||
         ( _bbmin[2] > _bbmax[2] )   ) {
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      // Invalid bounding box, try to recover
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      setScenePos( properties_.sceneCenter() , properties_.sceneRadius(), _resetTrackBall );
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      // Update bounding box to match the scene geometry after recovery
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      _bbmin = ACG::Vec3d(-1.0,-1.0,-1.0);
      _bbmax = ACG::Vec3d( 1.0, 1.0, 1.0);
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    } else {
      
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      // For very small scenes, we set the scene radius to 0.1
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      // otherwise we take the real radius
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      if ( ( _bbmax - _bbmin ).max() < OpenFlipperSettings().value("Core/Gui/glViewer/minimalSceneSize",0.1).toDouble() )  {
        setScenePos( ( _bbmin + _bbmax )        * 0.5,
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                     OpenFlipperSettings().value("Core/Gui/glViewer/minimalSceneSize",0.1).toDouble(),
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                     _resetTrackBall);
                   
      } else {
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        setScenePos( ( _bbmin + _bbmax )        * 0.5,
                     ( _bbmax - _bbmin ).norm() * 0.5,
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                     _resetTrackBall); 
      }
                   
    }
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    // remember the new bounding box for the state
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    glstate_->set_bounding_box(_bbmin,_bbmax);
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  }
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  updateGL();

  emit(signalSceneGraphChanged(sceneGraphRoot_));
}


//-----------------------------------------------------------------------------


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void glViewer::trackMouse(bool _track)
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{
  trackMouse_ = _track;
}


//-----------------------------------------------------------------------------

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void glViewer::setCoordSysProjection(ProjectionMode _mode) {
  // Find coordsys node
  ACG::SceneGraph::BaseNode* node = 0;
  node = PluginFunctions::getSceneGraphRootNode()->find("Core Coordsys Node");

  // set the projection mode for the coordinate system node
  if (node != 0) {
    ACG::SceneGraph::CoordsysNode* cnode = dynamic_cast<ACG::SceneGraph::CoordsysNode*> (node);
    if (_mode ==  ORTHOGRAPHIC_PROJECTION) {
      cnode->setProjectionMode(ACG::SceneGraph::CoordsysNode::ORTHOGRAPHIC_PROJECTION);
    } else {
      cnode->setProjectionMode(ACG::SceneGraph::CoordsysNode::PERSPECTIVE_PROJECTION);
    }
  }
}


//-----------------------------------------------------------------------------


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void glViewer::perspectiveProjection()
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{
  projectionMode(PERSPECTIVE_PROJECTION);
  updateGL();
}


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void glViewer::orthographicProjection()
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{
  projectionMode(ORTHOGRAPHIC_PROJECTION);
  updateGL();
}


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void glViewer::toggleProjectionMode()
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{
  if (projectionMode_ == ORTHOGRAPHIC_PROJECTION)
    projectionMode(PERSPECTIVE_PROJECTION);
  else
    projectionMode(ORTHOGRAPHIC_PROJECTION);

  updateGL();
}


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void glViewer::projectionMode(ProjectionMode _p)
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{
  if ((projectionMode_ = _p) == ORTHOGRAPHIC_PROJECTION)
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    emit projectionModeChanged( true );
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  else
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    emit projectionModeChanged( false );
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  updateProjectionMatrix();
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  setCoordSysProjection(_p);

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  emit viewChanged();
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}

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void glViewer::toggleNavigationMode()
{
  if (navigationMode_ == NORMAL_NAVIGATION)
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    navigationMode(FIRSTPERSON_NAVIGATION);
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  else
    navigationMode(NORMAL_NAVIGATION);
}


void glViewer::navigationMode(NavigationMode _n)
{
  if ((navigationMode_ = _n) == NORMAL_NAVIGATION)
    emit navigationModeChanged( true );
  else
    emit navigationModeChanged( false );
}

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void glViewer::setFOVY(double _fovy) {
    
  if(_fovy <= 0.0 || _fovy >= 180) {
    std::cerr << "Error: Minimum or maximum fovy angle exceeded!" << std::endl;
    return;
  }
  
  OpenFlipperSettings().setValue("Core/Projection/FOVY", _fovy);
  updateProjectionMatrix();
}

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void glViewer::updateProjectionMatrix()
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{
  if( projectionUpdateLocked_ )
    return;

  makeCurrent();

  glstate_->reset_projection();

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  const double aspect = this->aspect_ratio();
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  // In stereo mode we have to use a perspective matrix
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  if ( projectionMode_ == PERSPECTIVE_PROJECTION)
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  {
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    // Get fovy
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    const double fovy = this->field_of_view_vertical();
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    glstate_->perspective(fovy, (GLdouble) aspect,
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                          near_plane(), far_plane());
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  }
  else
  {
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    glstate_->ortho( -ortho_width(), ortho_width(),
                     -ortho_width() / aspect, ortho_width() / aspect,
                     near_plane(), far_plane() );
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  }
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}


//-----------------------------------------------------------------------------


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void glViewer::setScenePos(const ACG::Vec3d& _center, double _radius, const bool _resetTrackBall)
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{
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  if(_resetTrackBall) {
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    properties_.trackballCenter(_center);
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  }

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  properties_.sceneCenter(_center);
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  properties_.sceneRadius(_radius);
  properties_.trackballRadius(_radius);
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  ACG::Vec3d c = glstate_->modelview().transform_point(properties_.sceneCenter());
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  double nearPlane = std::max(0.0001f * properties_.sceneRadius(),  -(c[2] + properties_.sceneRadius()));
  double farPlane  = std::max(0.0002f * properties_.sceneRadius(),  -(c[2] - properties_.sceneRadius()));
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   // Safety check, if near < 0
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   if ( nearPlane <= 0.0 ) {
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     std::cerr << "Error in BaseViewer drawScene, nearplane <= 0.0" << std::endl;
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     nearPlane = 0.000000000000001;
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   }

  // Safety check. Make sure that they are in the right order
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  if ( nearPlane > farPlane ) {
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    std::cerr << "Error in BaseViewer setScenePos, Nearplane > Farplane" << std::endl;
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    std::swap(nearPlane,farPlane);
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  }

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  properties_.setPlanes(nearPlane,farPlane);
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  properties_.orthoWidth(_radius);
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  updateProjectionMatrix();
  updateGL();

  emit viewChanged();
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}


//----------------------------------------------------------------------------


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void glViewer::viewingDirection( const ACG::Vec3d& _dir, const ACG::Vec3d& _up )
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{
  // calc eye point for this direction
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  ACG::Vec3d eye = properties_.sceneCenter() - _dir * ( 3.0 * properties_.sceneRadius());
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  glstate_->reset_modelview();
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  glstate_->lookAt((ACG::Vec3d)eye, (ACG::Vec3d)properties_.sceneCenter(), (ACG::Vec3d)_up);
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  emit viewChanged();
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}

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//-----------------------------------------------------------------------------

void glViewer::lookAt(const ACG::Vec3d& _eye, const ACG::Vec3d& _center, const ACG::Vec3d& _up) {
    
    glstate_->reset_modelview();
    glstate_->lookAt(_eye, _center, _up);
    
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    properties_.sceneCenter( _center );
    properties_.sceneRadius( (properties_.sceneCenter() - _eye).norm() );
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    emit viewChanged();
}
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//-----------------------------------------------------------------------------

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void glViewer::normalsMode(NormalsMode _mode)
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{
  makeCurrent();

  switch(normalsMode_ = _mode)
  {
    case DONT_TOUCH_NORMALS:
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      ACG::GLState::disable(GL_NORMALIZE);
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      break;

    case NORMALIZE_NORMALS:
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      ACG::GLState::enable(GL_NORMALIZE);
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      break;
  }

  updateGL();
}


//-----------------------------------------------------------------------------


void
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glViewer::copyToImage( QImage& _image,
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		       unsigned int _l, unsigned int _t,
		       unsigned int _w, unsigned int _h,
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			     GLenum /* _buffer */ )
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{
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//    makeCurrent();

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  _image = glWidget_->grabFrameBuffer(true).copy (_l, _t, _w, _h).convertToFormat (QImage::Format_RGB32);
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}


//-----------------------------------------------------------------------------


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void glViewer::updateGL()
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{
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  if (!properties_.updateLocked() && isVisible() )
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  {
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    updatePickCache_ = true;
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    update();
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    emit viewUpdated();
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  }
}



//-----------------------------------------------------------------------------


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void glViewer::drawScene()
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{
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  // Inside the glWidget rendering, the system should not send extra updates
  properties_.blockSignals(true);
  
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  QTime  timer;
  timer.start();

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  // *****************************************************************
  // Adjust clipping planes
  // *****************************************************************
  // Far plane
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  ACG::Vec3d c = glstate_->modelview().transform_point(properties_.sceneCenter());
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  double nearPlane = std::max(0.0001f * properties_.sceneRadius(),  -(c[2] + properties_.sceneRadius()));
  double farPlane  = std::max(0.0002f * properties_.sceneRadius(),  -(c[2] - properties_.sceneRadius()));
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  // Safety check, if near < 0
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  if ( nearPlane <= 0.0 ) {
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    std::cerr << "Error in BaseViewer drawScene, nearplane < 0" << std::endl;
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    nearPlane = 0.000000000000001;
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  }

  // Safety check. Make sure that they are in the right order
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  if ( nearPlane > farPlane ) {
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    std::cerr << "Error in BaseViewer drawScene, Nearplane > Farplane" << std::endl;
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    std::swap(nearPlane,farPlane);
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  }
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  properties_.setPlanes(nearPlane,farPlane);
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  updateProjectionMatrix();

  // store time since last repaint in gl state and restart timer
  glstate_->set_msSinceLastRedraw (redrawTime_.restart ());

  makeCurrent();
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  // draw mono or stereo
  // If stereo mode is selected, we have to provide multiple ways of rendering.

  // 1. Default internal pipeline : Directly to output buffer (no stereo support!)
  // 2. Non default : Non-stereo Directly to output buffer (no stereo support!)
  //
  //

//  if (OpenFlipper::Options::stereoMode () == OpenFlipper::Options::OpenGL && OpenFlipper::Options::glStereo ())
//  {
//    // Stereo      : Hardware support (OpenGL stereo : left and right buffer with offset eyes)
//
//    return;
//  }
//  else if (OpenFlipper::Options::stereoMode () == OpenFlipper::Options::AnaglyphCustom && customAnaglyphSupported_)
//  {
//    //Stereo      : No Hardware support (Left and right frame buffer with offset eyes)
//  } else {
//
//  }

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  // Clear back buffer here:
  // Render plugins do not have to worry about using scissor test for clearing their viewports later on.
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  glClearColor(properties_.backgroundColor()[0], properties_.backgroundColor()[1],
		  properties_.backgroundColor()[2], properties_.backgroundColor()[3]);
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  GLint curViewport[4];
  glGetIntegerv(GL_VIEWPORT, curViewport);
  glScissor(curViewport[0], curViewport[1], curViewport[2], curViewport[3]);
  glEnable(GL_SCISSOR_TEST);
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  glDisable(GL_SCISSOR_TEST);

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  // Check if we use build in default renderer
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  if ( renderManager().activeId( properties_.viewerId() ) == 0 ) {
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    drawScene_mono();
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  } else {
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    RenderInterface* renderPlugin = renderManager().active( properties_.viewerId() )->plugin;

    // eventually set viewer id in IRenderer
    ACG::IRenderer* shaderRenderPlugin = dynamic_cast<ACG::IRenderer*>(renderPlugin);

    if (shaderRenderPlugin)
      shaderRenderPlugin->setViewerID( properties_.viewerId() );

    renderPlugin->render(glstate_,properties_);
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  }
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  checkGLError();
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  // =================================================================================
  // Post-Processing pipeline
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  const int numPostProcessors = postProcessorManager().numActive(properties_.viewerId());
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  if (numPostProcessors)
  {
    GLuint backbufferFbo = 0;
    glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, (GLint*)&backbufferFbo);
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    updatePostProcessingBufs(glstate_->viewport_width(),glstate_->viewport_height());
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    readBackBuffer(glstate_);
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    // 1st post processing source: active fbo
    int postProcSrc = 1;
    PostProcessorInput postProcInput;
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    postProcInput.colorTex_ = readBackFbo_.getAttachment(GL_COLOR_ATTACHMENT0);
    postProcInput.depthTex_ = readBackFbo_.getAttachment(GL_DEPTH_ATTACHMENT);
    postProcInput.width     = readBackFbo_.width();
    postProcInput.height    = readBackFbo_.height();
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    // execute post processing chain with 2 FBOs
    for (int i = 0; i < numPostProcessors; ++i)  {
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      int postProcTarget = 1 - postProcSrc;
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      GLuint targetFBO = postProcessFBO_[postProcTarget].getFboID();
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      // write to back buffer in last step
      if (i + 1 == numPostProcessors)
        targetFBO = backbufferFbo;
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      // apply post processor
      PostProcessorInfo* proc = postProcessorManager().active( properties_.viewerId(), i );
      if (proc && proc->plugin)
        proc->plugin->postProcess(glstate_, postProcInput, targetFBO);
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      // swap target/source fbo
      postProcSrc = postProcTarget;
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      postProcInput.colorTex_ = postProcessFBO_[postProcSrc].getAttachment(GL_COLOR_ATTACHMENT0);
    }
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  }
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  // =================================================================================

  // unbind vbo for qt log window
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  ACG::GLState::bindBuffer(GL_ARRAY_BUFFER, 0);
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  ACG::GLState::activeTexture(GL_TEXTURE0);
  ACG::GLState::bindTexture(GL_TEXTURE_2D, 0);
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//  fbo.release();
//
//  QRect blitRect(0,0,glstate_->viewport_width(),glstate_->viewport_height());
//
//  //
//  //QTime time;
//  //time.restart();
//  QGLFramebufferObject::blitFramebuffer( 0 , blitRect, &fbo, blitRect , GL_COLOR_BUFFER_BIT );
//  //std::cerr << "Elapsed for blit: " << time.elapsed() << std::endl;

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  glFinish();
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  frame_time_ = timer.elapsed();
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  // Inside the glWidget rendering, the system should not send extra updates
  properties_.blockSignals(false);
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}


//-----------------------------------------------------------------------------


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void glViewer::drawScene_mono()
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{
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  if (sceneGraphRoot_) {
    ViewObjectMarker *oM = properties_.objectMarker();
    GLuint refBits = 0;
    QSet<GLuint> references;
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    if (oM)
    {
      glClear (GL_STENCIL_BUFFER_BIT);
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      ACG::GLState::enable (GL_STENCIL_TEST);
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      glStencilOp (GL_KEEP, GL_KEEP, GL_ZERO);
      glStencilFunc (GL_ALWAYS, 0, ~0);
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      for (PluginFunctions::ObjectIterator o_it(PluginFunctions::ALL_OBJECTS, DATA_ALL) ;
          o_it != PluginFunctions::objectsEnd(); ++o_it)
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      {
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        bool ok;
        GLuint ref;

        ok = oM->stencilRefForObject(*o_it, ref);
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        if (ok)
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        {
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          o_it->stencilRefNode ()->setReference (ref);
          o_it->stencilRefNode ()->show ();
          refBits |= ref;
          references << ref;
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        }
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        else
          o_it->stencilRefNode ()->hide ();
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      }
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    }

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    // First pass
    ACG::SceneGraph::DrawAction pass1( properties_.drawMode(), *glstate_ , false);
    ACG::SceneGraph::traverse_multipass(sceneGraphRoot_, pass1, *glstate_, properties_.drawMode() );
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    // Second Pass for Blending operations
    ACG::SceneGraph::DrawAction pass2(properties_.drawMode(), *glstate_, true);
    ACG::SceneGraph::traverse_multipass(sceneGraphRoot_, pass2, *glstate_, properties_.drawMode());
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    if (oM)
    {
      if (oM->type() == ViewObjectMarker::PerBit)
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      {
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        references.clear ();
        for (unsigned int i = 0; i < sizeof (GLuint) * 8; i++)
          if (refBits & (1 << i))
            references << (1 << i);
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      }
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      glPushAttrib(GL_ALL_ATTRIB_BITS);
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      ACG::GLState::enable(GL_BLEND);
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      ACG::GLState::disable(GL_DEPTH_TEST);
      ACG::GLState::disable(GL_LIGHTING);
      ACG::GLState::disable(GL_DITHER);
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      int vp_l, vp_b, vp_w, vp_h;
      glstate_->get_viewport (vp_l, vp_b, vp_w, vp_h);
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      glMatrixMode(GL_PROJECTION);
      glPushMatrix ();
      glLoadIdentity();
      glOrtho(0, vp_w, vp_h, 0, 0, 1.0);
      glMatrixMode(GL_MODELVIEW);
      glPushMatrix ();
      glLoadIdentity();
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      glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP);
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      foreach (unsigned int ref, references)
      {
        bool ok;
        GLenum sfactor;
        GLenum dfactor;
        ACG::Vec4f color;
        unsigned int mask = ~0;
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        if (oM->type() == ViewObjectMarker::PerBit)
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        {
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          ok = oM->blendForStencilRefBit (ref, sfactor, dfactor, color);
          mask = ref;
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        }
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        else
          ok = oM->blendForStencilRefNumber (ref, sfactor, dfactor, color);
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        if (!ok)
          continue;
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        gl