forked from 0ad/0ad
70 lines
2.0 KiB
C++
70 lines
2.0 KiB
C++
/* 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 CBound;
|
|
|
|
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; }
|
|
|
|
//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 CBound &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
|