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// Frustum.h: interface for the CFrustum class. 
// 
////////////////////////////////////////////////////////////////////// 
 
#if !defined(AFX_FRUSTUM_H__55BE2796_F699_42C5_907D_728962C28269__INCLUDED_) 
#define AFX_FRUSTUM_H__55BE2796_F699_42C5_907D_728962C28269__INCLUDED_ 
 
#if _MSC_VER > 1000 
#pragma once 
#endif // _MSC_VER > 1000 
//class CTerrain; 
#include "gamehead.h" 
#include "vector.h" 
enum FrustumSide 
{ 
	RIGHT	= 2,		// The RIGHT side of the frustum 
	LEFT	= 0,		// The LEFT	 side of the frustum 
	BOTTOM	= 3,		// The BOTTOM side of the frustum 
	TOP		= 1,		// The TOP side of the frustum 
	BACK	= 4,		// The BACK	side of the frustum 
	FRONT	= 5			// The FRONT side of the frustum 
};  
 
// Like above, instead of saying a number for the ABC and D of the plane, we 
// want to be more descriptive. 
enum PlaneData 
{ 
	A = 0,				// The X value of the plane's normal 
	B = 1,				// The Y value of the plane's normal 
	C = 2,				// The Z value of the plane's normal 
	D = 3				// The distance the plane is from the origin 
}; 
class CFrustum   
{ 
	friend class CTerrain; 
	friend class CPortal; 
public: 
 
	// Call this every time the camera moves to update the frustum 
	void CalculateFrustum(CVector3 &vPos); 
 
	// This takes a 3D point and returns TRUE if it's inside of the frustum 
	bool PointInFrustum(float x, float y, float z); 
 
	// This takes a 3D point and a radius and returns TRUE if the sphere is inside of the frustum 
	bool SphereInFrustum(float x, float y, float z, float radius); 
 
	// This takes the center and half the length of the cube. 
	bool CubeInFrustum( float x, float y, float z, float size ); 
 
	bool CuboidInFrustum( float x, float y, float z, float xLen, float yLen,float zLen); 
	bool QuadIsVisible(CVector3 *pVert); 
	bool TrigleIsInFrustum(CVector3 &vViewPos,CVector3 &a,CVector3 &b,CVector3 &c); 
	bool IntersectQuad(CVector3 &a,CVector3 &b,CVector3 &c,CVector3 &d,CVector3 vInter[]); 
 
public: 
	// This holds the A B C and D values for each side of our frustum. 
	float m_Frustum[6][4]; 
	static CVector3 m_vPos; 
public: 
	CFrustum(); 
	virtual ~CFrustum(); 
 
}; 
 
#endif // !defined(AFX_FRUSTUM_H__55BE2796_F699_42C5_907D_728962C28269__INCLUDED_)