G4OpenGLStoredViewer.cc

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// $Id$
//
// 
// Andrew Walkden  7th February 1997
// Class G4OpenGLStoredViewer : Encapsulates the `storedness' of
//                            an OpenGL view, for inheritance by
//                            derived (X, Xm...) classes.
 
#ifdef G4VIS_BUILD_OPENGL_DRIVER
 
#include "G4OpenGLStoredViewer.hh"
 
#include "G4PhysicalConstants.hh"
#include "G4OpenGLStoredSceneHandler.hh"
#include "G4Text.hh"
#include "G4Circle.hh"
#include "G4UnitsTable.hh"
#include "G4Scene.hh"
#include "G4OpenGLTransform3D.hh"
 
G4OpenGLStoredViewer::G4OpenGLStoredViewer
(G4OpenGLStoredSceneHandler& sceneHandler):
G4VViewer (sceneHandler, -1),  
G4OpenGLViewer (sceneHandler), 
fG4OpenGLStoredSceneHandler (sceneHandler)
{
  fLastVP = fDefaultVP; // Not sure if this gets executed before or
  // after G4VViewer::G4VViewer!!  Doesn't matter much.
}
 
G4OpenGLStoredViewer::~G4OpenGLStoredViewer () {}
 
void G4OpenGLStoredViewer::KernelVisitDecision () {
  
  // If there's a significant difference with the last view parameters
  // of either the scene handler or this viewer, trigger a rebuild.
 
  if (!fG4OpenGLStoredSceneHandler.fTopPODL ||
      CompareForKernelVisit(fLastVP)) {
    NeedKernelVisit ();
  }      
  fLastVP = fVP;
}
 
G4bool G4OpenGLStoredViewer::CompareForKernelVisit(G4ViewParameters& lastVP) {
 
  if (
      (lastVP.GetDrawingStyle ()    != fVP.GetDrawingStyle ())    ||
      (lastVP.IsAuxEdgeVisible ()   != fVP.IsAuxEdgeVisible ())   ||
      (lastVP.GetRepStyle ()        != fVP.GetRepStyle ())        ||
      (lastVP.IsCulling ()          != fVP.IsCulling ())          ||
      (lastVP.IsCullingInvisible () != fVP.IsCullingInvisible ()) ||
      (lastVP.IsDensityCulling ()   != fVP.IsDensityCulling ())   ||
      (lastVP.IsCullingCovered ()   != fVP.IsCullingCovered ())   ||
      (lastVP.IsSection ()          != fVP.IsSection ())          ||
      // Section (DCUT) implemented locally.  But still need to visit
      // kernel if status changes so that back plane culling can be
      // switched.
      (lastVP.IsCutaway ()          != fVP.IsCutaway ())          ||
      // Cutaways implemented locally.  But still need to visit kernel
      // if status changes so that back plane culling can be switched.
      (lastVP.IsExplode ()          != fVP.IsExplode ())          ||
      (lastVP.GetNoOfSides ()       != fVP.GetNoOfSides ())       ||
      (lastVP.GetDefaultVisAttributes()->GetColour() !=
       fVP.GetDefaultVisAttributes()->GetColour())                ||
      (lastVP.GetDefaultTextVisAttributes()->GetColour() !=
       fVP.GetDefaultTextVisAttributes()->GetColour())            ||
      (lastVP.GetBackgroundColour ()!= fVP.GetBackgroundColour ())||
      (lastVP.IsPicking ()          != fVP.IsPicking ())          ||
      (lastVP.GetVisAttributesModifiers().size() !=
       fVP.GetVisAttributesModifiers().size())
      )
    return true;
  
  if (lastVP.IsDensityCulling () &&
      (lastVP.GetVisibleDensity () != fVP.GetVisibleDensity ()))
    return true;
 
  /**************************************************************
  Section (DCUT) implemented locally.  No need to visit kernel if
  section plane itself changes.
  if (lastVP.IsSection () &&
      (lastVP.GetSectionPlane () != fVP.GetSectionPlane ()))
    return true;
  ***************************************************************/
 
  /**************************************************************
  Cutaways implemented locally.  No need to visit kernel if cutaway
  planes themselves change.
  if (lastVP.IsCutaway ()) {
    if (lastVP.GetCutawayPlanes ().size () !=
    fVP.GetCutawayPlanes ().size ()) return true;
    for (size_t i = 0; i < lastVP.GetCutawayPlanes().size(); ++i)
      if (lastVP.GetCutawayPlanes()[i] != fVP.GetCutawayPlanes()[i])
    return true;
  }
  ***************************************************************/
 
  if (lastVP.IsExplode () &&
      (lastVP.GetExplodeFactor () != fVP.GetExplodeFactor ()))
    return true;
 
  return false;
}
 
void G4OpenGLStoredViewer::DrawDisplayLists () {
#ifdef G4DEBUG_VIS_OGL
  printf("G4OpenGLStoredViewer::DrawDisplayLists \n");
#endif
 
  const G4Planes& cutaways = fVP.GetCutawayPlanes();
  G4bool cutawayUnion = fVP.IsCutaway() &&
    fVP.GetCutawayMode() == G4ViewParameters::cutawayUnion;
  const size_t nCutaways = cutawayUnion? cutaways.size(): 1;
#ifdef G4DEBUG_VIS_OGL
  printf("G4OpenGLStoredViewer::DrawDisplayLists");
#endif
  G4int iPass = 1;
  G4bool secondPassForTransparencyRequested = false;
  G4bool thirdPassForNonHiddenMarkersRequested = false;
  do {
    for (size_t iCutaway = 0; iCutaway < nCutaways; ++iCutaway) {
 
      if (cutawayUnion) {
    double a[4];
    a[0] = cutaways[iCutaway].a();
    a[1] = cutaways[iCutaway].b();
    a[2] = cutaways[iCutaway].c();
    a[3] = cutaways[iCutaway].d();
    glClipPlane (GL_CLIP_PLANE2, a);
    glEnable (GL_CLIP_PLANE2);
      }
 
      G4bool isPicking = fVP.IsPicking();
 
      for (size_t iPO = 0;
       iPO < fG4OpenGLStoredSceneHandler.fPOList.size(); ++iPO) {
    if (POSelected(iPO)) {
      G4OpenGLStoredSceneHandler::PO& po =
        fG4OpenGLStoredSceneHandler.fPOList[iPO];
      G4Colour c = po.fColour;
      DisplayTimePOColourModification(c,iPO);
          const G4bool isTransparent = c.GetAlpha() < 1.;
      if ( iPass == 1) {
        if (isTransparent && transparency_enabled) {
          secondPassForTransparencyRequested = true;
          continue;
        }
        if (po.fMarkerOrPolyline && fVP.IsMarkerNotHidden()) {
          thirdPassForNonHiddenMarkersRequested = true;
          continue;
        }
      } else if (iPass == 2) {  // Second pass for transparency.
        if (!isTransparent) {
          continue;
        }
      } else {  // Third pass for non-hidden markers
        if (!po.fMarkerOrPolyline) {
          continue;
        }            
          }
      if (isPicking) glLoadName(po.fPickName);
          if (transparency_enabled) {
            glColor4d(c.GetRed(),c.GetGreen(),c.GetBlue(),c.GetAlpha());
          } else {
            glColor3d(c.GetRed(),c.GetGreen(),c.GetBlue());
          }
          if (po.fMarkerOrPolyline && fVP.IsMarkerNotHidden())
            glDisable (GL_DEPTH_TEST);
          else {glEnable (GL_DEPTH_TEST); glDepthFunc (GL_LEQUAL);}
      if (po.fpG4TextPlus) {
        if (po.fpG4TextPlus->fProcessing2D) {
          glMatrixMode (GL_PROJECTION);
          glPushMatrix();
          glLoadIdentity();
          glOrtho (-1., 1., -1., 1., -G4OPENGL_FLT_BIG, G4OPENGL_FLT_BIG);
          glMatrixMode (GL_MODELVIEW);
          glPushMatrix();
          glLoadIdentity();
        }
        G4OpenGLTransform3D oglt (po.fTransform);
        glMultMatrixd (oglt.GetGLMatrix ());
        fOpenGLSceneHandler.G4OpenGLSceneHandler::AddPrimitive
          (po.fpG4TextPlus->fG4Text);
        if (po.fpG4TextPlus->fProcessing2D) {
          glMatrixMode (GL_PROJECTION);
          glPopMatrix();
          glMatrixMode (GL_MODELVIEW);
          glPopMatrix();
        }
      } else {
        glPushMatrix();
        G4OpenGLTransform3D oglt (po.fTransform);
        glMultMatrixd (oglt.GetGLMatrix ());
        glCallList (po.fDisplayListId);
        glPopMatrix();
      }
    }
      }
 
      G4Transform3D lastMatrixTransform;
      G4bool first = true;
 
      for (size_t iTO = 0;
       iTO < fG4OpenGLStoredSceneHandler.fTOList.size(); ++iTO) {
    if (TOSelected(iTO)) {
      G4OpenGLStoredSceneHandler::TO& to =
        fG4OpenGLStoredSceneHandler.fTOList[iTO];
          const G4Colour& c = to.fColour;
          const G4bool isTransparent = c.GetAlpha() < 1.;
      if ( iPass == 1) {
        if (isTransparent && transparency_enabled) {
          secondPassForTransparencyRequested = true;
          continue;
        }
        if (to.fMarkerOrPolyline && fVP.IsMarkerNotHidden()) {
          thirdPassForNonHiddenMarkersRequested = true;
          continue;
        }
      } else if (iPass == 2) {  // Second pass for transparency.
        if (!isTransparent) {
          continue;
        }
      } else {  // Third pass for non-hidden markers
        if (!to.fMarkerOrPolyline) {
          continue;
        }
          }
          if (to.fMarkerOrPolyline && fVP.IsMarkerNotHidden())
            glDisable (GL_DEPTH_TEST);
          else {glEnable (GL_DEPTH_TEST); glDepthFunc (GL_LEQUAL);}
      if (to.fEndTime >= fStartTime && to.fStartTime <= fEndTime) {
        if (fVP.IsPicking()) glLoadName(to.fPickName);
        if (to.fpG4TextPlus) {
          if (to.fpG4TextPlus->fProcessing2D) {
        glMatrixMode (GL_PROJECTION);
        glPushMatrix();
        glLoadIdentity();
        glOrtho (-1., 1., -1., 1., -G4OPENGL_FLT_BIG, G4OPENGL_FLT_BIG);
        glMatrixMode (GL_MODELVIEW);
        glPushMatrix();
        glLoadIdentity();
          }
          G4OpenGLTransform3D oglt (to.fTransform);
          glMultMatrixd (oglt.GetGLMatrix ());
              if (transparency_enabled) {
                glColor4d(c.GetRed(),c.GetGreen(),c.GetBlue(),c.GetAlpha());
              } else {
                glColor3d(c.GetRed(),c.GetGreen(),c.GetBlue());
              }
          fOpenGLSceneHandler.G4OpenGLSceneHandler::AddPrimitive
        (to.fpG4TextPlus->fG4Text);
          if (to.fpG4TextPlus->fProcessing2D) {
        glMatrixMode (GL_PROJECTION);
        glPopMatrix();
        glMatrixMode (GL_MODELVIEW);
        glPopMatrix();
          }
        } else {
          if (to.fTransform != lastMatrixTransform) {
        if (! first) {
          glPopMatrix();
        }
        first = false;
        glPushMatrix();
        G4OpenGLTransform3D oglt (to.fTransform);
        glMultMatrixd (oglt.GetGLMatrix ());
          }
          const G4Colour& cc = to.fColour;
          if (fFadeFactor > 0. && to.fEndTime < fEndTime) {
        // Brightness scaling factor
        G4double bsf = 1. - fFadeFactor *
          ((fEndTime - to.fEndTime) / (fEndTime - fStartTime));
        const G4Colour& bg = fVP.GetBackgroundColour();
                if (transparency_enabled) {
                  glColor4d
          (bsf * cc.GetRed() + (1. - bsf) * bg.GetRed(),
           bsf * cc.GetGreen() + (1. - bsf) * bg.GetGreen(),
           bsf * cc.GetBlue() + (1. - bsf) * bg.GetBlue(),
                   bsf * cc.GetAlpha() + (1. - bsf) * bg.GetAlpha());
                } else {
                  glColor3d
          (bsf * cc.GetRed() + (1. - bsf) * bg.GetRed(),
           bsf * cc.GetGreen() + (1. - bsf) * bg.GetGreen(),
           bsf * cc.GetBlue() + (1. - bsf) * bg.GetBlue());
                }
          } else {
                if (transparency_enabled) {
                  glColor4d(cc.GetRed(),cc.GetGreen(),cc.GetBlue(),cc.GetAlpha());
                } else {
                  glColor3d(cc.GetRed(),cc.GetGreen(),cc.GetBlue());
                }
          }
          glCallList (to.fDisplayListId);
        }
        if (to.fTransform != lastMatrixTransform) {
          lastMatrixTransform = to.fTransform;
        }
      }
    }
      }
      if (! first) {
    glPopMatrix();
      }
 
      if (cutawayUnion) glDisable (GL_CLIP_PLANE2);
    }  // iCutaway
    
    if (iPass == 2) secondPassForTransparencyRequested = false;  // Done.
    if (iPass == 3) thirdPassForNonHiddenMarkersRequested = false;  // Done.
    
    if (secondPassForTransparencyRequested) iPass = 2;
    else if (thirdPassForNonHiddenMarkersRequested) iPass = 3;
    else break;
 
  } while (true);
 
  // Display time at "head" of time range, which is fEndTime...
  if (fDisplayHeadTime && fEndTime < DBL_MAX) {
    glMatrixMode (GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();
    glOrtho (-1., 1., -1., 1., -G4OPENGL_FLT_BIG, G4OPENGL_FLT_BIG);
    glMatrixMode (GL_MODELVIEW);
    glPushMatrix();
    glLoadIdentity();
    G4Text headTimeText(G4BestUnit(fEndTime,"Time"),
            G4Point3D(fDisplayHeadTimeX, fDisplayHeadTimeY, 0.));
    headTimeText.SetScreenSize(fDisplayHeadTimeSize);
    G4VisAttributes visAtts (G4Colour
                 (fDisplayHeadTimeRed,
                  fDisplayHeadTimeGreen,
                  fDisplayHeadTimeBlue));
    headTimeText.SetVisAttributes(&visAtts);
    fOpenGLSceneHandler.G4OpenGLSceneHandler::AddPrimitive(headTimeText);
    glMatrixMode (GL_PROJECTION);
    glPopMatrix();
    glMatrixMode (GL_MODELVIEW);
    glPopMatrix();
  }
 
  // Display light front...
  if (fDisplayLightFront && fEndTime < DBL_MAX) {
    G4double lightFrontRadius = (fEndTime - fDisplayLightFrontT) * c_light;
    if (lightFrontRadius > 0.) {
      G4Point3D lightFrontCentre(fDisplayLightFrontX, fDisplayLightFrontY, fDisplayLightFrontZ);
      G4Point3D circleCentre = lightFrontCentre;
      G4double circleRadius = lightFrontRadius;
      if (fVP.GetFieldHalfAngle() > 0.) {
    // Perspective view.  Find horizon centre and radius...
    G4Point3D targetPoint = fSceneHandler.GetScene()->GetStandardTargetPoint() +
      fVP.GetCurrentTargetPoint();
    G4double sceneRadius = fSceneHandler.GetScene()->GetExtent().GetExtentRadius();
    if(sceneRadius <= 0.) sceneRadius = 1.;
    G4double cameraDistance = fVP.GetCameraDistance(sceneRadius);
    G4Point3D cameraPosition = targetPoint + cameraDistance * fVP.GetViewpointDirection().unit();
    G4Vector3D lightFrontToCameraDirection = cameraPosition - lightFrontCentre;
    G4double lightFrontCentreDistance = lightFrontToCameraDirection.mag();
    /*
    G4cout << "cameraPosition: " << cameraPosition
           << ", lightFrontCentre: " << lightFrontCentre
           << ", lightFrontRadius: " << lightFrontRadius
           << ", lightFrontCentreDistance: " << lightFrontCentreDistance
           << ", dot: " << lightFrontToCameraDirection * fVP.GetViewpointDirection()
           << G4endl;
    */
    if (lightFrontToCameraDirection * fVP.GetViewpointDirection() > 0. && lightFrontRadius < lightFrontCentreDistance) {
      // Light front in front of camera...
      G4double sineHorizonAngle = lightFrontRadius / lightFrontCentreDistance;
      circleCentre = lightFrontCentre + (lightFrontRadius * sineHorizonAngle) * lightFrontToCameraDirection.unit();
      circleRadius = lightFrontRadius * std::sqrt(1. - std::pow(sineHorizonAngle, 2));
      /*
      G4cout << "sineHorizonAngle: " << sineHorizonAngle
         << ", circleCentre: " << circleCentre
         << ", circleRadius: " << circleRadius
         << G4endl;
      */
    } else {
      circleRadius = -1.;
    }
      }
      if (circleRadius > 0.) {
    G4Circle lightFront(circleCentre);
    lightFront.SetWorldRadius(circleRadius);
    glColor3d(fDisplayLightFrontRed,
          fDisplayLightFrontGreen,
          fDisplayLightFrontBlue);
    fOpenGLSceneHandler.G4OpenGLSceneHandler::AddPrimitive(lightFront);
      }
    }
  }
}
 
#endif