76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
/* Copyright (C) 2009 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* CFrustum is a collection of planes which define a viewing space.
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*/
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/*
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Usually associated with the camera, there are 6 planes which define the
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view pyramid. But we allow more planes per frustum which may be used for
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portal rendering, where a portal may have 3 or more edges.
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*/
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#ifndef INCLUDED_FRUSTUM
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#define INCLUDED_FRUSTUM
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#include "maths/Plane.h"
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//10 planes should be enough
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#define MAX_NUM_FRUSTUM_PLANES (10)
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class CBoundingBoxAligned;
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class CMatrix3D;
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class CFrustum
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{
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public:
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CFrustum ();
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~CFrustum ();
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//Set the number of planes to use for
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//calculations. This is clipped to
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//[0,MAX_NUM_FRUSTUM_PLANES]
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void SetNumPlanes (size_t num);
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size_t GetNumPlanes() const { return m_NumPlanes; }
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void AddPlane (const CPlane& plane);
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void Transform(CMatrix3D& m);
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//The following methods return true if the shape is
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//partially or completely in front of the frustum planes
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bool IsPointVisible(const CVector3D& point) const;
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bool DoesSegmentIntersect(const CVector3D& start, const CVector3D& end) const;
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bool IsSphereVisible(const CVector3D& center, float radius) const;
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bool IsBoxVisible(const CVector3D& position, const CBoundingBoxAligned& bounds) const;
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bool IsBoxVisible(const CBoundingBoxAligned& bounds) const;
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CPlane& operator[](size_t idx) { return m_aPlanes[idx]; }
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const CPlane& operator[](size_t idx) const { return m_aPlanes[idx]; }
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public:
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//make the planes public for ease of use
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CPlane m_aPlanes[MAX_NUM_FRUSTUM_PLANES];
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private:
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size_t m_NumPlanes;
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};
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#endif
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