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

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/*  Visualization Library                                                             */
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#ifndef RayIntersector_INCLUDE_ONCE
#define RayIntersector_INCLUDE_ONCE

#include <vlCore/Ray.hpp>
#include <vlGraphics/Actor.hpp>
#include <vlGraphics/Geometry.hpp>
#include <vlCore/Vector4.hpp>
#include <vlCore/Matrix4.hpp>
#include <vlGraphics/Frustum.hpp>

namespace vl
{
  class SceneManager;
  //-----------------------------------------------------------------------------
  // RayIntersection
  //-----------------------------------------------------------------------------
  class RayIntersection: public Object
  {
    VL_INSTRUMENT_CLASS(vl::RayIntersection, Object)

  public:
    RayIntersection(): mActor(NULL), mDistance(0.0f) 
    {
      VL_DEBUG_SET_OBJECT_NAME()
    }

    void setActor(Actor* a) { mActor = a; }
    const Actor* actor() const { return mActor; }
    Actor* actor() { return mActor; }

    const vec3& intersectionPoint() const { return mIntersectionPoint; }
    void setIntersectionPoint(const vec3& v) { mIntersectionPoint = v; }

    real distance() const { return mDistance; }
    void setDistance(real dist) { mDistance = dist; }

  protected:
    vec3 mIntersectionPoint;
    Actor* mActor;
    real mDistance;
  };
  //-----------------------------------------------------------------------------
  // RayIntersectionGeometry
  //-----------------------------------------------------------------------------
  class RayIntersectionGeometry: public RayIntersection
  {
    VL_INSTRUMENT_CLASS(vl::RayIntersectionGeometry, RayIntersection)

  public:
    RayIntersectionGeometry(): mGeometry(NULL), mDrawCalls(NULL), mTriangleIndex(-1) 
    {
      VL_DEBUG_SET_OBJECT_NAME()
      memset(mTriangle, 0xFF, sizeof(mTriangle));
    }

    Geometry* geometry() { return mGeometry; }
    const Geometry* geometry() const { return mGeometry; }
    DrawCall* drawCalls() { return mDrawCalls; }
    const DrawCall* drawCalls() const { return mDrawCalls; }
    int triangleIndex() const { return mTriangleIndex; }
    const int* triangle() const { return mTriangle; }

    void setGeometry(Geometry* g) { mGeometry = g; }
    void setPrimitives(DrawCall* p) { mDrawCalls = p; }
    void setTriangleIndex(int t_idx) { mTriangleIndex = t_idx; }
    void setTriangle(int a, int b, int c) { mTriangle[0] = a; mTriangle[1] = b; mTriangle[2] = c; }

  protected:
    vec3 mIntersectionPoint;
    Geometry* mGeometry;
    DrawCall* mDrawCalls;
    int mTriangleIndex;
    int mTriangle[3];
    float mDistance;
  };
  //-----------------------------------------------------------------------------
  // RayIntersector
  //-----------------------------------------------------------------------------
  class VLGRAPHICS_EXPORT RayIntersector: public Object
  {
    VL_INSTRUMENT_CLASS(vl::RayIntersector, Object)

  public:
    RayIntersector()
    {
      VL_DEBUG_SET_OBJECT_NAME()
      mActors = new ActorCollection;
    }

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

    const Ray& ray() const { return mRay; }
    void setRay(const Ray& ray) { mRay = ray; }

    const Frustum& frustum() const { return mFrustum; }
    void setFrustum(const Frustum& frustum) { mFrustum = frustum; }

    const std::vector< ref<RayIntersection> >& intersections() const { return mIntersections; }

    void intersect();

    void intersect(const Ray& ray, SceneManager* scene_manager);

  protected:
    static bool sorter(const ref<RayIntersection>& a, const ref<RayIntersection>& b) { return a->distance() < b->distance(); }

    void intersect(Actor* act);
    void intersectGeometry(Actor* act, Geometry* geom);

    // T should be either fvec3-4 or dvec3-4
    template<class T>
    void intersectTriangle(const T& a, const T& b, const T& c, int ia, int ib, int ic, Actor*, Geometry* geom, DrawCall* prim, int prim_idx);

  protected:
    Frustum mFrustum;
    std::vector< ref<RayIntersection> > mIntersections;
    ref<ActorCollection> mActors;
    Ray mRay;
  };
}

#endif