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//
// $Id: G4OpenGLStoredXViewer.cc,v 1.24 2009/01/19 16:53:42 lgarnier Exp $
// GEANT4 tag $Name:  $
//
// 
// Andrew Walkden  7th February 1997
// Class G4OpenGLStoredXViewer : a class derived from G4OpenGLXViewer and
//                             G4OpenGLStoredViewer.

#ifdef G4VIS_BUILD_OPENGLX_DRIVER

#include "G4OpenGLStoredXViewer.hh"

#include "G4ios.hh"

G4OpenGLStoredXViewer::
G4OpenGLStoredXViewer (G4OpenGLStoredSceneHandler& sceneHandler,
		 const G4String& name)
 : G4VViewer (sceneHandler, sceneHandler.IncrementViewCount (), name),
   G4OpenGLViewer (sceneHandler),
   G4OpenGLXViewer (sceneHandler),
   G4OpenGLStoredViewer (sceneHandler)
{
  if (fViewId < 0) return;  // In case error in base class instantiation.

  if (!vi_stored) {
    fViewId = -1;  // This flags an error.
    G4cerr << "G4OpenGLStoredXViewer::G4OpenGLStoredXViewer -"
      " G4OpenGLXViewer couldn't get a visual." << G4endl;
    return;
  }
}

G4OpenGLStoredXViewer::~G4OpenGLStoredXViewer () {}

void G4OpenGLStoredXViewer::Initialise () {

#ifdef G4DEBUG_VIS_OGL
  printf("G4OpenGLStoredXViewer::Initialise\n");
#endif
  CreateGLXContext (vi_stored);
  CreateMainWindow ();
  CreateFontLists ();

  InitializeGLView ();

// clear the buffers and window.
  ClearView ();
  FinishView ();

  glDepthFunc (GL_LEQUAL);
  glDepthMask (GL_TRUE);
}

void G4OpenGLStoredXViewer::DrawView () {

#ifdef G4DEBUG_VIS_OGL
  printf("G4OpenGLStoredXViewer::DrawView\n");
#endif
  //Make sure current viewer is attached and clean...
  glXMakeCurrent (dpy, fGLXWin, cx);

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

  //See if things have changed from last time and remake if necessary...
  // The fNeedKernelVisit flag might have been set by the user in
  // /vis/viewer/rebuild, but if not, make decision and set flag only
  // if necessary...
  if (!fNeedKernelVisit) KernelVisitDecision ();
  G4bool kernelVisitWasNeeded = fNeedKernelVisit; // Keep (ProcessView resets).
  ProcessView ();

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

    HaloingFirstPass ();
    DrawDisplayLists ();
#ifdef G4DEBUG_VIS_OGL
  printf("G4OpenGLStoredXViewer::DrawView flush \n");
#endif
    glFlush ();

    HaloingSecondPass ();

    DrawDisplayLists ();
    FinishView ();

  } else {

    // If kernel visit was needed, drawing and FinishView will already
    // have been done, so...
    if (!kernelVisitWasNeeded) {
#ifdef G4DEBUG_VIS_OGL
      printf("G4OpenGLStoredXViewer::DrawView NO need kernel visit\n");
#endif
      DrawDisplayLists ();
      FinishView ();
    } else {
#ifdef G4DEBUG_VIS_OGL
      printf("G4OpenGLStoredXViewer::DrawView NEED kernel visit\n");
#endif
    // However, union cutaways are implemented in DrawDisplayLists, so make
    // an extra pass...
      if (fVP.IsCutaway() &&
	  fVP.GetCutawayMode() == G4ViewParameters::cutawayUnion) {
	ClearView();
	DrawDisplayLists ();
	FinishView ();
      } else { // ADD TO AVOID KernelVisit=1 and nothing to display
        DrawDisplayLists ();
        FinishView ();
      }
    }
  }
}

void G4OpenGLStoredXViewer::FinishView () {
#ifdef G4DEBUG_VIS_OGL
  printf("G4OpenGLStoredXViewer::FinishView\n");
#endif
  glXWaitGL (); //Wait for effects of all previous OpenGL commands to
                //be propogated before progressing.

#ifdef G4DEBUG_VIS_OGL
  printf("G4OpenGLStoredXViewer::FinishView flush \n");
#endif
  glFlush (); //FIXME

  GLint renderMode;
  glGetIntegerv(GL_RENDER_MODE, &renderMode);
  if (renderMode == GL_RENDER) glXSwapBuffers (dpy, fGLXWin);  
}

#endif
