G4OpenGLSceneHandler.hh

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// $Id: G4OpenGLSceneHandler.hh 75567 2013-11-04 11:35:11Z gcosmo $
//
// 
// Andrew Walkden  27th March 1996
// OpenGL scene handler - base for immediate mode and stored mode classes to
//                        inherit from.

#ifdef G4VIS_BUILD_OPENGL_DRIVER

#ifndef G4OPENGLSCENEHANDLER_HH
#define G4OPENGLSCENEHANDLER_HH

#include "globals.hh"

#include "G4VSceneHandler.hh"
#include "G4OpenGL.hh"

#include <map>

class G4AttHolder;

// Base class for various OpenGLSceneHandler classes.
class G4OpenGLSceneHandler: public G4VSceneHandler {

  friend class G4OpenGLViewer;

public:
  virtual void BeginPrimitives (const G4Transform3D& objectTransformation);
  virtual void EndPrimitives ();
  virtual void BeginPrimitives2D (const G4Transform3D& objectTransformation);
  virtual void EndPrimitives2D ();
  void AddPrimitive (const G4Polyline&);
  void AddPrimitive (const G4Polymarker&);
  void AddPrimitive (const G4Text&);
  void AddPrimitive (const G4Circle&);
  void AddPrimitive (const G4Square&);
  void AddPrimitivesCircle (const std::vector <G4VMarker>&);
  void AddPrimitivesSquare (const std::vector <G4VMarker>&);
  void AddPrimitive (const G4Scale&);
  void AddPrimitive (const G4Polyhedron&);

  void PreAddSolid (const G4Transform3D& objectTransformation,
            const G4VisAttributes&);
  void AddSolid (const G4Box&);
  void AddSolid (const G4Cons&);
  void AddSolid (const G4Tubs&);
  void AddSolid (const G4Trd&);
  void AddSolid (const G4Trap&);
  void AddSolid (const G4Sphere&);
  void AddSolid (const G4Para&);
  void AddSolid (const G4Torus&);
  void AddSolid (const G4Polycone&);
  void AddSolid (const G4Polyhedra&);
  void AddSolid (const G4VSolid&);
  void AddCompound (const G4VTrajectory&);
  void AddCompound (const G4VHit&);
  void AddCompound (const G4VDigi&);
  void AddCompound (const G4THitsMap<G4double>&);

  G4int GetEventsDrawInterval() {return fEventsDrawInterval;}
  void SetEventsDrawInterval(G4int interval) {fEventsDrawInterval = interval;}

#ifdef G4OPENGL_VERSION_2
private :
  // vertex vector to be given to the graphic card
  std::vector<double> fOglVertex;
  // indices vector to be given to the graphic card
  std::vector<unsigned short> fOglIndices;
  // before, drawyType (as GL_QUADS, GL_TRIANGLES...) was
  // given in glBegin. Now it has to be given in glDrawArray (at the end)
  GLenum fDrawArrayType;
  // emulate GL_QUADS behaviour by inverting two last positions
  bool fEmulate_GL_QUADS;
  // Try to optimize a bit the pipeline
  void OptimizeVBOForTrd();
  void OptimizeVBOForCons(G4int aNoFacet);
  // emulating glEnd and glBegin
  void glEndVBO();
  void glBeginVBO(GLenum type);
  void drawVBOArray(std::vector<double> vertices);
  
// Buffers used to access vertex and indices elements
#ifndef G4VIS_BUILD_OPENGLWT_DRIVER
  GLuint fVertexBufferObject;
  GLuint fIndicesBufferObject;
#else
  Wt::WGLWidget::Buffer fVertexBufferObject;
  Wt::WGLWidget::Buffer fIndicesBufferObject;
#endif

#endif

protected:

  G4OpenGLSceneHandler (G4VGraphicsSystem& system,
            G4int id,
            const G4String& name = "");
  virtual ~G4OpenGLSceneHandler ();

  void ProcessScene();
  G4VSolid* CreateSectionSolid ();
  G4VSolid* CreateCutawaySolid ();

  void ClearAndDestroyAtts();  // Destroys att holders and clears pick map.

#ifdef G4VIS_BUILD_OPENGLWT_DRIVER
  // Special case for Wt, we want to have acces to the Wt drawer everywhere
  // because instead of OpenGL call which are static, Wt openGL functions are functions of an WGLWidget
  // object(G4OpenGLImmediateViewer in our case)

  inline void setWtDrawer(G4OpenGLWtDrawer* drawer) {
    fWtDrawer = drawer;
  }
  G4OpenGLWtDrawer* fWtDrawer;
#endif
  
  GLuint fPickName;
  std::map<GLuint, G4AttHolder*> fPickMap;  // For picking.

  // Shared code to wait until we make a single glFlush
  void ScaledFlush () ;
  // Number of events to wait until we make a single glFlush
  G4int fEventsDrawInterval;
  // Number of events waiting to be flushed
  G4int fEventsWaitingToBeFlushed;
  
  // True if caller of primitives is capable of processing three passes.
  G4bool fThreePassCapable;

  G4bool fSecondPassForTransparencyRequested;
  G4bool fSecondPassForTransparency;
  
  G4bool fThirdPassForNonHiddenMarkersRequested;
  G4bool fThirdPassForNonHiddenMarkers;
  
  static const GLubyte fStippleMaskHashed [128];
};

#include "G4OpenGLSceneHandler.icc"

#endif

#endif