/home/master/UCL/VisualizationLibrary/src/vlGraphics/SceneManagerPortals.hpp

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/*  Visualization Library                                                             */
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#ifndef PortalSceneManager_INCLUDE_ONCE
#define PortalSceneManager_INCLUDE_ONCE

#include <vlGraphics/Actor.hpp>
#include <vlCore/Vector4.hpp>
#include <vlCore/Vector3.hpp>
#include <vlGraphics/SceneManager.hpp>
#include <vlCore/Log.hpp>
#include <vlGraphics/Frustum.hpp>

namespace vl
{
//-----------------------------------------------------------------------------
  class Sector;
  class SceneManagerPortals;
//-----------------------------------------------------------------------------
  class VLGRAPHICS_EXPORT Portal: public Object
  {
    VL_INSTRUMENT_CLASS(vl::Portal, Object)

    friend class SceneManagerPortals;

  public:
    Portal()
    {
      VL_DEBUG_SET_OBJECT_NAME()
      mIsOpen = true;
      mVisitTick = 0;
    }

    std::vector<fvec3>& geometry() { return mPortalGeometry; }
    const std::vector<fvec3>& geometry() const { return mPortalGeometry; }

    void setTargetSector(Sector* sector) { mTargetSector = sector; }
    Sector* targetSector() { return mTargetSector; }
    const Sector* targetSector() const { return mTargetSector; }

    bool isOpen() const { return mIsOpen; }
    void setIsOpen(bool is_open) { mIsOpen = is_open; }

  protected:
    void setNormal(const fvec3& n) { mNormal = n; }
    const fvec3& normal() const { return mNormal; }

    bool computeNormal();

  protected:
    std::vector<fvec3> mPortalGeometry;
    Sector* mTargetSector;
    fvec3 mNormal;
    unsigned int mVisitTick;
    bool mIsOpen;
  };
//-----------------------------------------------------------------------------
  class VLGRAPHICS_EXPORT Sector: public Object
  {
    VL_INSTRUMENT_CLASS(vl::Sector, Object)

  public:
    class VisibilityCallback: public Object
    {
    public:
        virtual void operator()(const Camera* cam, SceneManagerPortals* psm, Sector* s, Portal* p) = 0;
    };
  public:
    Sector() 
    { 
      VL_DEBUG_SET_OBJECT_NAME()
      mActors = new ActorCollection; 
    }

    ActorCollection* actors() { return mActors.get(); }
    const ActorCollection* actors() const { return mActors.get(); }

    std::vector< ref<Portal> >& portals() { return mPortals; }
    const std::vector< ref<Portal> >& portals() const { return mPortals; }

    std::vector< AABB >& volumes() { return mVolumes; }
    const std::vector< AABB >& volumes() const { return mVolumes; }

    AABB computeBoundingBox();

    std::vector< ref<VisibilityCallback> >& callbacks() { return mCallbacks; }
    const std::vector< ref<VisibilityCallback> >& callbacks() const { return mCallbacks; }
    void executeCallbacks(const Camera*cam,SceneManagerPortals* psm, Portal*p);

  protected:
    std::vector< ref<Portal> > mPortals;
    std::vector< AABB > mVolumes;
    ref< ActorCollection > mActors;
    std::vector< ref<VisibilityCallback> > mCallbacks;
  };
//-----------------------------------------------------------------------------
  class VLGRAPHICS_EXPORT SceneManagerPortals: public SceneManager
  {
    VL_INSTRUMENT_CLASS(vl::SceneManagerPortals, SceneManager)

  public:
    SceneManagerPortals(): mExternalSector(new Sector), mVisitTick(1), mShowPortals(false) 
    {
      VL_DEBUG_SET_OBJECT_NAME()
    }

    void extractActors(ActorCollection& list);
    void extractVisibleActors(ActorCollection& list, const Camera* camera);

    std::vector< ref<Sector> >& sectors() { return mSectors; }
    const std::vector< ref<Sector> >& sectors() const { return mSectors; }

    Sector* externalSector() { return mExternalSector.get(); }
    const Sector* externalSector() const { return mExternalSector.get(); }

    void computePortalNormals();

    void initialize();

    bool showPortals() const { return mShowPortals; }
    void setShowPortals(bool show) { mShowPortals = show; }
    void invalidatePortalActors() { mPortalActorMap.clear(); }

    const std::vector<Frustum>& frustumStack() const { return mFrustumStack; }

  protected:
    void renderPortal(Portal* portal);
    void visitSector(Sector* prev, Sector* sector, const vec3& eye, const Camera* camera);
    Sector* computeStartingSector(const Camera* camera);

  protected:
    ref<Sector> mExternalSector;
    std::vector< ref<Sector> > mSectors;
    std::vector< ref<Actor> > mTempActors;
    std::map<Portal*, ref<Actor> > mPortalActorMap;
    std::vector<Frustum> mFrustumStack;
    unsigned mVisitTick;
    bool mShowPortals;
  };
//-----------------------------------------------------------------------------
}

#endif