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//=============================================================================
//
//                               OpenFlipper
//        Copyright (C) 2008 by Computer Graphics Group, RWTH Aachen
//                           www.openflipper.org
//
//-----------------------------------------------------------------------------
//
//                                License
//
//  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.
//
//  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 Lesser General Public License
//  along with OpenFlipper.  If not, see <http://www.gnu.org/licenses/>.
//
//-----------------------------------------------------------------------------
//
//   $Revision: 4430 $
//   $Author: moebius $
//   $Date: 2009-01-23 17:14:32 +0100 (Fr, 23. Jan 2009) $
//
//=============================================================================




//=============================================================================
//
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//  CLASS glViewer - IMPLEMENTATION
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//
//=============================================================================


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

#include "QtBaseViewer.hh"
#include "QtGLGraphicsScene.hh"
#include "QtGLGraphicsView.hh"
#include <ACG/QtWidgets/QtWheel.hh>
#include <ACG/Scenegraph/DrawModes.hh>
#include <ACG/GL/gl.hh>

#include <iostream>
#include <string>
#include <assert.h>

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

#include <QClipboard>
#include <QApplication>
#include <QSplitter>
#include <QLayout>
#include <QPushButton>
#include <QLabel>
#include <QStatusBar>
#include <QImage>
#include <QColorDialog>
#include <QFileDialog>
#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>

#include <QGraphicsWidget>
#include <QGraphicsGridLayout>
#include <QGraphicsProxyWidget>

#ifdef max
#  undef max
#endif

#ifdef min
#  undef min
#endif


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



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

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

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


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glViewer::glViewer( QWidget* _parent,
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			    const char* /* _name */ ,
			    QStatusBar *_statusBar,
			    const QGLFormat* _format,
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			    const glViewer* _share) :
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  QWidget(_parent),
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  statusbar_(_statusBar),
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  glareaGrabbed_(false),
  updateLocked_(false),
  projectionUpdateLocked_(false),
  blending_(true),
  pick_mode_name_(""),
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  pick_mode_idx_(-1),
  glstate_(0)
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{
  // check for OpenGL support
  if ( !QGLFormat::hasOpenGL() )
  {
    std::cerr << "This system has no OpenGL support.\n";
    exit(1);
  }


  // widget stuff
  createWidgets(_format,_statusBar,_share);


  // bind GL context to GL state class
  glstate_ = new ACG::GLState();

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  properties_.setglState( glstate_ );

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  // state
  orthoWidth_       = 2.0;
  isRotating_       = false;
  near_             = 0.1;
  far_              = 100.0;
  fovy_             = 45.0;

  focalDist_        = 3.0;
  eyeDist_          = 0.01;

  sceneGraphRoot_   = 0;
  curDrawMode_      = ACG::SceneGraph::DrawModes::NONE;
  availDrawModes_   = ACG::SceneGraph::DrawModes::NONE;

  normalsMode_      = DONT_TOUCH_NORMALS;
  projectionMode_   = PERSPECTIVE_PROJECTION;
  backFaceCulling_  = false;
  twoSidedLighting_ = true;
  animation_        = false;

  light_matrix_.identity();

  trackMouse_ = false;

  // stereo
  stereo_ = false;


  pickMenu_ = 0;
  drawMenu_ = 0;


  // 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()) );

  allowRotation_ = true;

  //default wheel zoom factors
  wZoomFactor_ = 1.0;
  wZoomFactorShift_ = 0.2;

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  connect( &properties_,SIGNAL(updated()), this, SLOT( slotPropertiesUpdated() ) );
  connect( &properties_,SIGNAL(actionModeChanged(Viewer::ActionMode)), this, SLOT( updateActionMode(Viewer::ActionMode) ) );

  properties_.setExamineMode();

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}


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


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


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


QSize
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glViewer::sizeHint() const
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{
  return QSize( 600, 600 );
}


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


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void glViewer::setStatusBar(QStatusBar* _sb)
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{
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  statusbar_ = _sb;
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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)
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{
  sceneGraphRoot_ = _root;

  if (sceneGraphRoot_)
  {
    // get draw modes
    ACG::SceneGraph::CollectDrawModesAction action;
    ACG::SceneGraph::traverse(sceneGraphRoot_, action);
    availDrawModes_ = action.drawModes();
    updatePopupMenu();

    // get scene size
    ACG::SceneGraph::BoundingBoxAction act;
    ACG::SceneGraph::traverse(sceneGraphRoot_, act);

    ACG::Vec3d bbmin = (ACG::Vec3d) act.bbMin();
    ACG::Vec3d bbmax = (ACG::Vec3d) act.bbMax();

    if ( ( bbmin[0] > bbmax[0] ) ||
         ( bbmin[1] > bbmax[1] ) ||
         ( bbmin[2] > bbmax[2] )   )
      setScenePos( ACG::Vec3d( 0.0,0.0,0.0 ) , 1.0 );
    else
      setScenePos( ( bbmin + bbmax )        * 0.5,
                   ( bbmax - bbmin ).norm() * 0.5 );
  }

  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::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);

  // sync
  emit(signalSetView(glstate_->modelview(), glstate_->inverse_modelview()));

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

  makeCurrent();

  glstate_->reset_projection();

  switch (projectionMode_)
  {
    case ORTHOGRAPHIC_PROJECTION:
    {
      double aspect = (double) glWidth() / (double) glHeight();
      glstate_->ortho( -orthoWidth_, orthoWidth_,
		       -orthoWidth_/aspect, orthoWidth_/aspect,
		       near_, far_ );
      break;
    }

    case PERSPECTIVE_PROJECTION:
    {
      glstate_->perspective(fovy_,
			    (GLdouble) glWidth() / (GLdouble) glHeight(),
			    near_, far_);
      break;
    }
  }
}


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


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void glViewer::setScenePos(const ACG::Vec3d& _center, double _radius)
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{
  scene_center_ = trackball_center_ = _center;
  scene_radius_ = trackball_radius_ = _radius;

  orthoWidth_ = 2.0   * scene_radius_;
  near_       = 0.001 * scene_radius_;
  far_        = 10.0  * scene_radius_;

  updateProjectionMatrix();
  updateGL();
}


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


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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
  ACG::Vec3d eye = scene_center_ - _dir*(3.0*scene_radius_);

  glstate_->reset_modelview();
  glstate_->lookAt((ACG::Vec3d)eye, (ACG::Vec3d)scene_center_, (ACG::Vec3d)_up);
}


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


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void glViewer::updateActionMode(Viewer::ActionMode _am)
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{

  trackMouse(false);


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  switch ( properties_.actionMode() )
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  {
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    case Viewer::ExamineMode:
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    {
      glView_->setCursor(Qt::PointingHandCursor);
      glBase_->setCursor(Qt::PointingHandCursor);
      break;
    }


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    case Viewer::LightMode:
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    {
      glView_->setCursor(Qt::PointingHandCursor);
      glBase_->setCursor(Qt::PointingHandCursor);
      break;
    }


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    case Viewer::PickingMode:
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    {
      glView_->setCursor(Qt::ArrowCursor);
      glBase_->setCursor(Qt::ArrowCursor);
      if (pick_mode_idx_ != -1) {
	     trackMouse(pick_modes_[pick_mode_idx_].tracking);
        glView_->setCursor(pick_modes_[pick_mode_idx_].cursor);
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	     glBase_->setCursor(pick_modes_[pick_mode_idx_].cursor);
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      }

      break;
    }


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    case Viewer::QuestionMode:
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    {
      glView_->setCursor(Qt::WhatsThisCursor);
      glBase_->setCursor(Qt::WhatsThisCursor);
      break;
    }
  }


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  emit(signalActionModeChanged( _am ));
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  //emit pickmodeChanged with either the name of the current pickmode or an empty string
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  if( properties_.pickingMode() )
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    emit(signalPickModeChanged(pick_mode_name_));
  else
    emit(signalPickModeChanged(""));
}


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


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void glViewer::backFaceCulling(bool _b)
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{
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  emit functionMenuUpdate();

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  makeCurrent();
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  if ( (backFaceCulling_ = _b) )
    glEnable( GL_CULL_FACE );
  else
    glDisable( GL_CULL_FACE );

  updateGL();
}


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void glViewer::twoSidedLighting(bool _b)
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{
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  emit functionMenuUpdate();

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  makeCurrent();
  glstate_->set_twosided_lighting(twoSidedLighting_=_b);
  updateGL();
}


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void glViewer::animation(bool _b)
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{
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  emit functionMenuUpdate();
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  makeCurrent();
  animation_ = _b;
  updateGL();
}


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


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

  switch(normalsMode_ = _mode)
  {
    case DONT_TOUCH_NORMALS:
      glDisable(GL_NORMALIZE);
      break;

    case NORMALIZE_NORMALS:
      glEnable(GL_NORMALIZE);
      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 */ ,
			   GLenum /* _buffer */ )
{
  makeCurrent();
  _image = glWidget_->grabFrameBuffer(true);
}


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


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void glViewer::drawNow()
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{
  makeCurrent();
  paintGL();
  swapBuffers();
  glView_->repaint();
}

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void glViewer::updateGL()
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{
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  if (!properties_.updateLocked() && !isHidden() )
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  {
    glScene_->update();
  }
}



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


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void glViewer::drawScene()
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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(scene_center_);
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  // Set far plane
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  far_    = std::max(0.0002f * scene_radius_,  -(c[2] - scene_radius_));
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  // Set near plane
  near_   = std::max(0.0001f * scene_radius_,  -(c[2] + scene_radius_));

  // measure distance from scene center ( as projection onto the z-Axis )
//   if ( -c[2] < scene_radius_ ) {
//     std::cerr << "Camera in scene radius" << std::endl;
//
//   }
//
//   std::cerr << "-c[2]   : " << -c[2] << std::endl;
//   std::cerr << "radius  : " << scene_radius_ << std::endl;
//   std::cerr << "z-range : " << far_ - near_ << std::endl;
//   std::cerr << "Near    : " << near_ << std::endl;
//   std::cerr << "Far     : " << far_ << std::endl;
//   near_   = std::max(far_ / 256.0f,  -(c[2] + scene_radius_));

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  updateProjectionMatrix();

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

  // draw mono or stereo
  makeCurrent();
  if (stereo_) drawScene_stereo();
  else         drawScene_mono();


  glFinish();
  frame_time_ = timer.elapsed();
}


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


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void glViewer::drawScene_mono()
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{
  if (sceneGraphRoot_)
  {
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    if (! properties_.renderPicking() ) {
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      ACG::SceneGraph::DrawAction action(curDrawMode_, false);
      ACG::SceneGraph::traverse(sceneGraphRoot_, action, *glstate_, curDrawMode_);

      if( blending_ )
      {
        ACG::SceneGraph::DrawAction action(curDrawMode_, true);
        ACG::SceneGraph::traverse(sceneGraphRoot_, action, *glstate_, curDrawMode_);
      }
    } else {

      // prepare GL state
      makeCurrent();

      glDisable(GL_LIGHTING);
      glClear(GL_DEPTH_BUFFER_BIT);
      glInitNames();
      glPushName((GLuint) 0);

      // do the picking
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      ACG::SceneGraph::PickAction action(properties_.renderPickingMode());
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      ACG::SceneGraph::traverse(sceneGraphRoot_, action, *glstate_);

      glEnable(GL_LIGHTING);
    }
  }
}


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


void
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glViewer::drawScene_stereo()
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{
  double l, r, t, b, w, h, a, radians, wd2, ndfl;

  w = glWidth();
  h = glHeight();
  a = w / h;

  radians = fovy_ * 0.5 / 180.0 * M_PI;
  wd2     = near_ * tan(radians);
  ndfl    = near_ / focalDist_ * scene_radius_;

  l = -a*wd2;
  r =  a*wd2;
  t =  wd2;
  b = -wd2;

  double offset  = 0.5 * eyeDist_;
  double offset2 = offset * ndfl;



  // left eye
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glFrustum(l+offset2, r+offset2, b, t, near_, far_);
  glTranslatef(-offset, 0.0, 0.0);
  glMatrixMode(GL_MODELVIEW);
  glDrawBuffer(GL_BACK_LEFT);
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  drawScene_mono();


  // right eye
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glFrustum(l-offset2, r-offset2, b, t, near_, far_);
  glTranslatef(offset, 0.0, 0.0);
  glMatrixMode(GL_MODELVIEW);
  glDrawBuffer(GL_BACK_RIGHT);
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  drawScene_mono();
  glDrawBuffer(GL_BACK);
}



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


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void glViewer::setHome()
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{
  home_modelview_          = glstate_->modelview();
  home_inverse_modelview_  = glstate_->inverse_modelview();
  homeOrthoWidth_          = orthoWidth_;
  home_center_             = trackball_center_;
  home_radius_             = trackball_radius_;
}


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void glViewer::home()
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{
  makeCurrent();
  glstate_->set_modelview(home_modelview_, home_inverse_modelview_);
  orthoWidth_ = homeOrthoWidth_;
  trackball_center_ = home_center_;
  trackball_radius_ = home_radius_;
  updateProjectionMatrix();
  updateGL();

  // sync
  emit(signalSetView(glstate_->modelview(), glstate_->inverse_modelview()));
}


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


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void glViewer::viewAll()
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{
  makeCurrent();

  // move center (in camera coords) to origin and translate in -z dir
  translate(-(glstate_->modelview().transform_point(scene_center_))
	    - ACG::Vec3d(0.0, 0.0, 3.0*scene_radius_ ));

  orthoWidth_ = 1.1*scene_radius_;
  double aspect = (double) glWidth() / (double) glHeight();
  if (aspect > 1.0) orthoWidth_ *= aspect;
  updateProjectionMatrix();
  updateGL();

  // sync
  emit(signalSetView(glstate_->modelview(), glstate_->inverse_modelview()));
}


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


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void glViewer::flyTo(const QPoint& _pos, bool _move_back)
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{
  makeCurrent();

  unsigned int nodeIdx, targetIdx;
  ACG::Vec3d hitPoint;

  if (pick( ACG::SceneGraph::PICK_ANYTHING, _pos, nodeIdx, targetIdx, &hitPoint))
  {
    if (projectionMode_ == PERSPECTIVE_PROJECTION)
    {
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      ACG::Vec3d eye(glstate_->eye());
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      ACG::Vec3d t = hitPoint - eye;
      ACG::Vec3d e = eye + t * (_move_back ? -0.5f : 0.5f);
      flyTo(e, hitPoint, 300);
    }
    else
    {
      // Zoom in or out?
      orthoWidth_ *= _move_back ? 2.0 : 0.5;

      // Set the double click point as the new trackball center
      // Rotations will use this point as the center.
      trackball_center_ = hitPoint;

      /// @todo : Translate view such that hitpoint is in center of viewport

      // Update the projection matrix
      updateProjectionMatrix();

      // Redraw scene
      updateGL();
    }

    // sync with external viewer
    emit(signalSetView(glstate_->modelview(), glstate_->inverse_modelview()));
  }
}


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void glViewer::flyTo(const ACG::Vec3d&  _position,
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			 const ACG::Vec3d&  _center,
			 double        _time)
{
  makeCurrent();

  // compute rotation
  ACG::Vec3d c = glstate_->modelview().transform_point(_center);
  ACG::Vec3d p = glstate_->modelview().transform_point(_position);
  ACG::Vec3d view =(p-c).normalize();
  ACG::Vec3d z(0,0,1);
  ACG::Vec3d axis = (z % -view).normalize();
  double angle = acos(std::max(-1.0,
			      std::min(1.0,
				       (z | view)))) / M_PI * 180.0;

  if (angle > 175)
    axis  = ACG::Vec3d(0,1,0);


  // compute translation
  ACG::Vec3d target = glstate_->modelview().transform_point(_center);
  ACG::Vec3d trans ( -target[0],
		-target[1],
		-target[2] - (_position-_center).norm() );



  // how many frames in _time ms ?
  unsigned int  frames = (unsigned int)(_time / frame_time_);
  if (frames > 1000) frames=1000;




  // animate it
  if (frames > 10)
  {
    ACG::Vec3d t = trans / (double)frames;
    double a = angle / (double)frames;

    for (unsigned int i=0; i<frames; ++i)
    {
      translate(t);
      if (fabs(a) > FLT_MIN)
	     rotate(axis, a, _center);

      drawNow();
    }
  }


  // no animation
  else
  {
    translate(trans);
    if (fabs(angle) > FLT_MIN)
      rotate(axis, angle, _center);

    updateGL();
  }


  trackball_center_ = _center;
  trackball_radius_ = std::max(scene_radius_,
			       (_center-_position).norm()*0.9f);
}


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


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void glViewer::setView(const ACG::GLMatrixd& _modelview,
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			                  const ACG::GLMatrixd& _inverse_modelview)
{
  makeCurrent();
  glstate_->set_modelview(_modelview, _inverse_modelview);
  updateGL();
}


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


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void glViewer::initializeGL()
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{
  // we use GLEW to manage extensions
  // initialize it first
  glewInit();


  // lock update
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  properties_.lockUpdate();
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  // init GL state
  glstate_->initialize();

  // OpenGL state
  glEnable(GL_DEPTH_TEST);
  glEnable(GL_LIGHTING);
  glDisable(GL_DITHER);
  glShadeModel( GL_FLAT );


  projectionMode(   projectionMode_   );
  normalsMode(      normalsMode_      );
  backFaceCulling(  backFaceCulling_  );
  twoSidedLighting( twoSidedLighting_ );

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  // Update all settings which would require a redraw
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  applyProperties();
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  // light sources
  light_matrix_.identity();
  update_lights();


  // scene pos and size
  scene_center_ = trackball_center_ = ACG::Vec3d( 0.0, 0.0, 0.0 );
  scene_radius_ = trackball_radius_ = 1.0;
  orthoWidth_   = 2.0;


  // modelview
  glstate_->translate(0.0, 0.0, -3.0);
  setHome();


  // pixel transfer
  glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
  glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
  glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
  glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  glPixelStorei(GL_PACK_ROW_LENGTH, 0);
  glPixelStorei(GL_PACK_SKIP_ROWS, 0);
  glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
  glPixelStorei(GL_PACK_ALIGNMENT, 1);


  // emit initialization signal
  emit(signalInitializeGL());


  // unlock update (we started locked)
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  properties_.unLockUpdate();
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}


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


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void glViewer::update_lights()
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{
  makeCurrent();

  glMatrixMode(GL_MODELVIEW);
  glPushMatrix();
  glLoadIdentity();
  glMultMatrixd(light_matrix_.data());

  GLfloat pos[4], col[4];

  col[0] = col[1] = col[2] = 0.7;
  pos[3] = col[3] = 0.0;

#define SET_LIGHT(i,x,y,z) { 			\
    pos[0]=x; pos[1]=y; pos[2]=z;		\
    glLightfv(GL_LIGHT##i, GL_POSITION, pos);	\
    glLightfv(GL_LIGHT##i, GL_DIFFUSE,  col);	\
    glLightfv(GL_LIGHT##i, GL_SPECULAR, col);	\
    glEnable(GL_LIGHT##i);			\
  }

  SET_LIGHT(0,  0.0,  0.0, 1.0);
  SET_LIGHT(1, -1.0,  1.0, 0.7);
  SET_LIGHT(2,  1.0,  1.0, 0.7);

  col[0] = col[1] = col[2] = 0.3; col[3] = 1.0;
  glLightModelfv(GL_LIGHT_MODEL_AMBIENT, col);

  glPopMatrix();
}


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void glViewer::rotate_lights(ACG::Vec3d& _axis, double _angle)
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{
  light_matrix_.rotate(_angle, _axis[0], _axis[1], _axis[2], ACG::MULT_FROM_LEFT);
  update_lights();
}


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


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void glViewer::paintGL()
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{
  static bool initialized = false;
  if (!initialized)
  {
    // we use GLEW to manage extensions
    // initialize it first
    glewInit();

    // lock update
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    properties_.lockUpdate();
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    // init GL state
    glstate_->initialize();

    // initialize lights
    light_matrix_.identity();

    // scene pos and size
    scene_center_ = trackball_center_ = ACG::Vec3d( 0.0, 0.0, 0.0 );
    scene_radius_ = trackball_radius_ = 1.0;
    orthoWidth_   = 2.0;

    // modelview
    glstate_->translate(0.0, 0.0, -3.0);
    setHome();

    // pixel transfer
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