SimpleOpenGLImmediateQtViewer.cpp

// File modified by Deepak Samuel on 25 Sep 2019
//
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// Class SimpleOpenGLImmediateQtViewer : a class derived from G4OpenGLQtViewer and
//                                G4OpenGLImmediateViewer.

#include "SimpleOpenGLImmediateQtViewer.h"
#include "G4OpenGLImmediateSceneHandler.hh"

#include "G4ios.hh"
#ifdef G4MULTITHREADED
#include "G4Threading.hh"
#endif
#include <qapplication.h>
#include <qtabwidget.h>

#ifdef G4OPENGL_VERSION_2
#include <qglshaderprogram.h>
#endif


SimpleOpenGLImmediateQtViewer::SimpleOpenGLImmediateQtViewer
(G4OpenGLImmediateSceneHandler& sceneHandler,
 const G4String&  name):
  G4VViewer (sceneHandler, sceneHandler.IncrementViewCount (), name),
  G4OpenGLViewer (sceneHandler),
  SimpleOpenGLQtViewer (sceneHandler),
  G4OpenGLImmediateViewer (sceneHandler)
{
  fQGLWidgetInitialiseCompleted = false;

  setFocusPolicy(Qt::StrongFocus); // enable keybord events
  fHasToRepaint = false;
  fPaintEventLock = false;

  // Create a new drawer
  // register the QtDrawer to the OpenGLViewer
#ifdef G4OPENGL_VERSION_2
  setVboDrawer(new G4OpenGLVboDrawer(this,"OGL-VBO"));
#endif

  fUpdateGLLock = false;

  if (fViewId < 0) return;  // In case error in base class instantiation.
}

SimpleOpenGLImmediateQtViewer::~SimpleOpenGLImmediateQtViewer() {
  makeCurrent();
}

void SimpleOpenGLImmediateQtViewer::Initialise() {
  makeCurrent();

  fQGLWidgetInitialiseCompleted = false;
  CreateMainWindow (this,QString(GetName()));

  glDrawBuffer (GL_BACK);

  // set the good tab active
  if (QGLWidget::parentWidget()) {
    QTabWidget *parentTab = dynamic_cast<QTabWidget*> (QGLWidget::parentWidget()->parent()) ;
    if (parentTab) {
      parentTab->setCurrentIndex(parentTab->count()-1);
    }
  }

  fQGLWidgetInitialiseCompleted = true;
}

void SimpleOpenGLImmediateQtViewer::initializeGL () {

#ifndef G4OPENGL_VERSION_2
  InitializeGLView ();
#else
    QGLShaderProgram *aQGLShaderProgram = new QGLShaderProgram (context());
    fShaderProgram = aQGLShaderProgram->programId ();

    aQGLShaderProgram->addShaderFromSourceCode(QGLShader::Vertex,
                                               fVboDrawer->getVertexShaderSrc());

    aQGLShaderProgram->addShaderFromSourceCode(QGLShader::Fragment,
                                               fVboDrawer->getFragmentShaderSrc());

    aQGLShaderProgram->link();
    aQGLShaderProgram->bind();

    fVertexPositionAttribute =  glGetAttribLocation(fShaderProgram, "aVertexPosition");
    fcMatrixUniform =  glGetUniformLocation(fShaderProgram, "uCMatrix");
    fpMatrixUniform =  glGetUniformLocation(fShaderProgram, "uPMatrix");
    ftMatrixUniform =  glGetUniformLocation(fShaderProgram, "uTMatrix");
    fmvMatrixUniform = glGetUniformLocation(fShaderProgram, "uMVMatrix");

  // Load identity at beginning
  float identity[16] = {
    1.0f, 0, 0, 0,
    0, 1.0f, 0, 0,
    0, 0, 1.0f, 0,
    0, 0, 0, 1.0f
  };
  glUniformMatrix4fv (fcMatrixUniform, 1, 0, identity);
  glUniformMatrix4fv (fpMatrixUniform, 1, 0, identity);
  glUniformMatrix4fv (ftMatrixUniform, 1, 0, identity);
  glUniformMatrix4fv(fmvMatrixUniform, 1, 0, identity);

  glUseProgram(fShaderProgram);

  setInitialized();  // Should be removed when fuse Wt and Qt

#endif

  // If a double buffer context has been forced upon us, ignore the
  // back buffer for this OpenGLImmediate view.
  //  glDrawBuffer (GL_FRONT); // FIXME : Ne marche pas avec cette ligne, mais affiche le run correctement...

  if (fSceneHandler.GetScene() == 0) {
    fHasToRepaint =false;
  } else {
    fHasToRepaint =true;
  }

  // Set the component visible

  // and update it immediatly before wait for SessionStart() (batch mode)
//  QCoreApplication::sendPostedEvents () ;
}


void  SimpleOpenGLImmediateQtViewer::DrawView() {
#ifdef G4MULTITHREADED
  if (G4Threading::G4GetThreadId() == G4Threading::MASTER_ID) {
    updateQWidget();
  }
#else
  updateQWidget();
#endif
}


void SimpleOpenGLImmediateQtViewer::ComputeView () {

  makeCurrent();
  // If a double buffer context has been forced upon us, ignore the
  // back buffer for this OpenGLImmediate view.
  //  glDrawBuffer (GL_FRONT);

  G4ViewParameters::DrawingStyle dstyle = GetViewParameters().GetDrawingStyle();

  if(dstyle!=G4ViewParameters::hlr &&
     haloing_enabled) {

    HaloingFirstPass ();
    NeedKernelVisit ();
    ProcessView ();
    FinishView();
    HaloingSecondPass ();

  }

  NeedKernelVisit ();  // Always need to visit G4 kernel.
  ProcessView ();

  if (isRecording()) {
    savePPMToTemp();
  }

  fHasToRepaint = true;
}

/**
   - Lors du resize de la fenetre, on doit non pas redessiner le detecteur, mais aussi les evenements
*/
void SimpleOpenGLImmediateQtViewer::resizeGL(
 int aWidth
,int aHeight)
{
  if ((aWidth > 0) && (aHeight > 0)) {
    ResizeWindow(aWidth,aHeight);
    fHasToRepaint = sizeHasChanged();
  }
}


void SimpleOpenGLImmediateQtViewer::paintGL()
{
  updateToolbarAndMouseContextMenu();

  if (fPaintEventLock) {
//    return ;
  }
  if (!fQGLWidgetInitialiseCompleted) {
    fPaintEventLock = false;
    return;
  }
  if ((getWinWidth() == 0) && (getWinHeight() == 0)) {
      return;
  }

  // DO NOT RESIZE IF SIZE HAS NOT CHANGE
  if ( !fHasToRepaint) {
    // L. Garnier : Trap to get the size with mac OSX 10.6 and Qt 4.6(devel)
    // Tested on Qt4.5 on mac, 4.4 on windows, 4.5 on unbuntu
    int sw = 0;
    int sh = 0;
    if (!isMaximized() && !isFullScreen()) {
      sw = normalGeometry().width();
      sh = normalGeometry().height();
    } else {
      sw = frameGeometry().width();
      sh = frameGeometry().height();
    }
    if ((getWinWidth() == (unsigned int)sw) &&(getWinHeight() == (unsigned int)sh)) {
      return;

    } else if ((sw == 0) && (sh == 0)) { // NOT A TOP LEVEL WIDGET
      if (((getWinWidth() == (unsigned int)width())) &&(getWinHeight() == (unsigned int) height())) {
        return;
      }
    }
  }

  SetView();

  ClearView (); //ok, put the background correct
  ComputeView();

  fHasToRepaint = false; // could be set to false by ComputeView

  fPaintEventLock = false;
}

void SimpleOpenGLImmediateQtViewer::mousePressEvent(QMouseEvent *event)
{
  G4MousePressEvent(event);
}

void SimpleOpenGLImmediateQtViewer::keyPressEvent (QKeyEvent * event)
{
  G4keyPressEvent(event);
}

void SimpleOpenGLImmediateQtViewer::keyReleaseEvent (QKeyEvent * event)
{
  G4keyReleaseEvent(event);
}

void SimpleOpenGLImmediateQtViewer::wheelEvent (QWheelEvent * event)
{
  G4wheelEvent(event);
}

void SimpleOpenGLImmediateQtViewer::showEvent (QShowEvent *)
{
  if (fQGLWidgetInitialiseCompleted) {
    fHasToRepaint = true;
  }
}


/**
 * This function was build in order to make a zoom on double clic event.
 * It was think to build a rubberband on the zoom area, but never work fine
 */
void SimpleOpenGLImmediateQtViewer::mouseDoubleClickEvent(QMouseEvent *)
{
  G4MouseDoubleClickEvent();
}

void SimpleOpenGLImmediateQtViewer::mouseReleaseEvent(QMouseEvent *event)
{
  G4MouseReleaseEvent(event);
}

void SimpleOpenGLImmediateQtViewer::mouseMoveEvent(QMouseEvent *event)
{
  G4MouseMoveEvent(event);
}


void SimpleOpenGLImmediateQtViewer::contextMenuEvent(QContextMenuEvent *e)
{
  G4manageContextMenuEvent(e);
}

void SimpleOpenGLImmediateQtViewer::paintEvent(QPaintEvent *) {
  if (! fQGLWidgetInitialiseCompleted) {
    return;
  }
  // Force a repaint next time if the FRAMEBUFFER is not READY
  fHasToRepaint = isFramebufferReady();
  if ( fHasToRepaint) {
    updateGL();
  }
}


void SimpleOpenGLImmediateQtViewer::updateQWidget() {
  if (fUpdateGLLock) {
    return;
  }

  if (! isCurrentWidget()){
    return;
  }

  fUpdateGLLock = true;
  fHasToRepaint= true;
  repaint();
  updateViewerPropertiesTableWidget();
  updateSceneTreeWidget();
  fUpdateGLLock= false;
}


void SimpleOpenGLImmediateQtViewer::ShowView (
)
//////////////////////////////////////////////////////////////////////////////
//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!//
{
  fHasToRepaint = true;
  activateWindow();
}