G4OpenGLImmediateViewer.cc

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// Andrew Walkden  7th February 1997
// Class G4OpenGLImmediateViewer : Encapsulates the `immediateness' of
//                               an OpenGL view, for inheritance by
//                               derived (X, Xm...) classes.
 
#include "G4OpenGLImmediateViewer.hh"
#include "G4OpenGLImmediateSceneHandler.hh"
 
G4OpenGLImmediateViewer::G4OpenGLImmediateViewer (G4OpenGLImmediateSceneHandler& scene):
G4VViewer (scene, -1),
G4OpenGLViewer (scene)
{}
 
void G4OpenGLImmediateViewer::ProcessView ()
{
  const G4Planes& cutaways = fVP.GetCutawayPlanes();
  G4bool cutawayUnion = fVP.IsCutaway() &&
    fVP.GetCutawayMode() == G4ViewParameters::cutawayUnion;
  size_t nPasses = cutawayUnion? cutaways.size(): 1;
  for (size_t i = 0; i < nPasses; ++i) {
 
    if (cutawayUnion) {
      double a[4];
      a[0] = cutaways[i].a();
      a[1] = cutaways[i].b();
      a[2] = cutaways[i].c();
      a[3] = cutaways[i].d();
      glClipPlane (GL_CLIP_PLANE2, a);
      glEnable (GL_CLIP_PLANE2);
    }
 
    NeedKernelVisit ();  // Always need to visit G4 kernel.
    G4VViewer::ProcessView ();
 
    if (cutawayUnion) glDisable (GL_CLIP_PLANE2);
  }
}