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// ********************************************************************
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//
// $Id: G4OpenGLViewer.hh,v 1.33 2010/10/05 15:45:19 lgarnier Exp $
// GEANT4 tag $Name:  $
//
// 
// Andrew Walkden  27th March 1996
// OpenGL viewer - opens window, hard copy, etc.

#ifdef G4VIS_BUILD_OPENGL_DRIVER

#ifndef G4OPENGLVIEWER_HH
#define G4OPENGLVIEWER_HH

#include "G4VViewer.hh"
#include "G4OpenGL.hh"

class G4OpenGLSceneHandler;
class G4OpenGL2PSAction;

// Base class for various OpenGLView classes.
class G4OpenGLViewer: virtual public G4VViewer {

  friend class G4OpenGLSceneHandler;
  friend class G4OpenGLImmediateSceneHandler;
  friend class G4OpenGLStoredSceneHandler;
  friend class G4OpenGLFileSceneHandler;
  friend class G4OpenGLViewerMessenger;

public:
  void ClearView  ();

protected:
  G4OpenGLViewer (G4OpenGLSceneHandler& scene);
  virtual ~G4OpenGLViewer ();
  void SetView    ();
  void HaloingFirstPass ();
  void HaloingSecondPass ();
  void HLRFirstPass ();
  void HLRSecondPass ();
  void HLRThirdPass ();
  void InitializeGLView ();
  void ResizeGLView();
  void ResizeWindow(unsigned int, unsigned int);
  void Pick(GLdouble x, GLdouble y);
  virtual void CreateFontLists () {}
  void rotateScene (G4double dx, G4double dy,G4double delta);
  void rotateSceneInViewDirection (G4double dx, G4double dy,G4double delta);
//////////////////////////////Vectored PostScript production functions///
  void printEPS();
  // print EPS file. Depending of fVectoredPs, it will print Vectored or not
  void setPrintSize(G4int,G4int);
  // set the new print size. 
  // -1 means 'print size' = 'window size'
  // Setting size greater than max OpenGL viewport size will set the size to
  // maximum
  void setPrintFilename(G4String name,G4bool inc);
  // set print filename. 
  // if inc, then the filename will be increment by one each time
  std::string getRealPrintFilename();
  unsigned int getWinWidth();
  unsigned int getWinHeight();
  G4bool sizeHasChanged();
  // return true if size has change since last redraw
  GLdouble getSceneNearWidth();
  GLdouble getSceneFarWidth();
  GLdouble getSceneDepth();
  G4bool                            fPrintColour;
  G4bool                            fVectoredPs;

  G4OpenGLSceneHandler& fOpenGLSceneHandler;
  G4Colour background;      //the OpenGL clear colour
  G4bool
    transparency_enabled,   //is alpha blending enabled?
    antialiasing_enabled,   //is antialiasing enabled?
    haloing_enabled;        //is haloing enabled for wireframe?
  G4double fStartTime, fEndTime;  // Time range (e.g., for trajectory steps).
  G4double fFadeFactor;  // 0: no fade; 1: maximum fade with time within range.
  G4bool fDisplayHeadTime;  // Display head time (fEndTime) in 2D text.
  G4double fDisplayHeadTimeX, fDisplayHeadTimeY;  // 2D screen coords.
  G4double fDisplayHeadTimeSize;  // Screen size.
  G4double fDisplayHeadTimeRed, fDisplayHeadTimeGreen, fDisplayHeadTimeBlue;
  G4bool fDisplayLightFront;// Display light front at head time originating at
  G4double fDisplayLightFrontX, fDisplayLightFrontY, fDisplayLightFrontZ,
    fDisplayLightFrontT;
  G4double fDisplayLightFrontRed, fDisplayLightFrontGreen, fDisplayLightFrontBlue;
  G4OpenGL2PSAction* fGL2PSAction;

private :
  G4int                             fPrintSizeX;
  G4int                             fPrintSizeY;
  G4String                          fPrintFilename;
  int                               fPrintFilenameIndex;
  unsigned int fWinSize_x, fWinSize_y;
  G4float                           fPointSize;
  G4bool fSizeHasChanged;
  // size of the OpenGL frame
  bool printGl2PS();
  G4int getRealPrintSizeX();
  G4int getRealPrintSizeY();
  GLubyte* grabPixels (int inColor,
		       unsigned int width,
		       unsigned int height);
  bool printNonVectoredEPS ();
  // print non vectored EPS files

  bool printVectoredEPS();
  // print vectored EPS files
};

typedef struct G4OpenGLViewerFeedback3Dcolor {
  GLfloat x;
  GLfloat y;
  GLfloat z;
  GLfloat red;
  GLfloat green;
  GLfloat blue;
  GLfloat alpha;
} Feedback3Dcolor;

#endif

#endif