Frustum.h

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#pragma once

// global definitions
#include "Structures.h"           // CullingLocation, FrustumInformation

// includes for mathematical objects
#include "Plane.h"                // plane object
#include "Vector3.h"              // vector object
#include "CameraObject.h"         // camera object


class Frustum {
public:
  Frustum( FrustumInformation frustum );
  ~Frustum( void );
  void update( CameraObject *camera );

  float Frustum::getFrustumWidth( float dist );
  float Frustum::getFrustumHeight( float dist );
  CullingLocation isPointInFrustum( const Vector3 &p );
  CullingLocation isSphereInFrustum( const Vector3 &p, float radius );
  bool isInUpperHalf( const Vector3 &p );
  bool isInRightHalf( const Vector3 &p );
  void setFrustumInformation( FrustumInformation frustum );
private:
  enum {// enumeration that give's us easy access to the planes array
    topPlane = 0,
    bottomPlane,
    leftPlane,
    rightPlane,
    nearPlane,
    farPlane
  };
  Plane planes[6]; // array for the six bording planes of the frustum

  // declaration of the 8 edges of the frustum
  Vector3 farTopLeft;
  Vector3 farTopRight;
  Vector3 farBottomLeft;
  Vector3 farBottomRight;
  Vector3 nearTopLeft;
  Vector3 nearTopRight;
  Vector3 nearBottomLeft;
  Vector3 nearBottomRight;

  FrustumInformation frustum;
};