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/* Copyright (C) 2009 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* CFrustum is a collection of planes which define a viewing space.
*/
/*
Usually associated with the camera, there are 6 planes which define the
view pyramid. But we allow more planes per frustum which may be used for
portal rendering, where a portal may have 3 or more edges.
*/
#ifndef INCLUDED_FRUSTUM
#define INCLUDED_FRUSTUM
#include "maths/Plane.h"
//10 planes should be enough
#define MAX_NUM_FRUSTUM_PLANES (10)
class CBoundingBoxAligned;
class CFrustum
{
public:
CFrustum ();
~CFrustum ();
//Set the number of planes to use for
//calculations. This is clipped to
//[0,MAX_NUM_FRUSTUM_PLANES]
void SetNumPlanes (size_t num);
size_t GetNumPlanes() const { return m_NumPlanes; }
void AddPlane (const CPlane& plane);
//The following methods return true if the shape is
//partially or completely in front of the frustum planes
bool IsPointVisible (const CVector3D &point) const;
bool DoesSegmentIntersect(const CVector3D& start, const CVector3D &end);
bool IsSphereVisible (const CVector3D ¢er, float radius) const;
bool IsBoxVisible (const CVector3D &position,const CBoundingBoxAligned &bounds) const;
CPlane& operator[](size_t idx) { return m_aPlanes[idx]; }
const CPlane& operator[](size_t idx) const { return m_aPlanes[idx]; }
public:
//make the planes public for ease of use
CPlane m_aPlanes[MAX_NUM_FRUSTUM_PLANES];
private:
size_t m_NumPlanes;
};
#endif
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