vladislavbelov
ffc4a56b9f
Fixes #6846 Differential Revision: https://code.wildfiregames.com/D5185 This was SVN commit r27965.
114 lines
3.3 KiB
C++
114 lines
3.3 KiB
C++
/* Copyright (C) 2021 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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* CBrush, a class representing a convex object
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*/
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#ifndef INCLUDED_BRUSH
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#define INCLUDED_BRUSH
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#include "maths/Vector3D.h"
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#include <vector>
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class CBoundingBoxAligned;
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class CFrustum;
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class CPlane;
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/**
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* Class CBrush: Represents a convex object, supports some CSG operations.
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*/
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class CBrush
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{
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public:
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CBrush();
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/**
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* CBrush: Construct a brush from a bounds object.
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*
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* @param bounds the CBoundingBoxAligned object to construct the brush from.
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*/
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CBrush(const CBoundingBoxAligned& bounds);
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/**
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* IsEmpty: Returns whether the brush is empty.
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*
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* @return @c true if the brush is empty, @c false otherwise
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*/
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bool IsEmpty() const { return m_Vertices.size() == 0; }
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/**
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* Bounds: Calculate the axis-aligned bounding box for this brush.
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*
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* @param result the resulting bounding box is stored here
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*/
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void Bounds(CBoundingBoxAligned& result) const;
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/**
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* Slice: Cut the object along the given plane, resulting in a smaller (or even empty) brush representing
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* the part of the object that lies in front of the plane (as defined by the positive direction of its
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* normal vector).
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*
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* @param plane the slicing plane
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* @param result the resulting brush is stored here
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*/
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void Slice(const CPlane& plane, CBrush& result) const;
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/**
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* Intersect: Intersect the brush with the given frustum.
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*
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* @param frustum the frustum to intersect with
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* @param result the resulting brush is stored here
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*/
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void Intersect(const CFrustum& frustum, CBrush& result) const;
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/**
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* Returns vertices in the brush. Intended for testing purposes; you should not need to use
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* this method directly.
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*/
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const std::vector<CVector3D>& GetVertices() const;
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/**
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* Writes a vector of the faces in this brush to @p out. Each face is itself a vector, listing the vertex indices
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* that make up the face, starting and ending with the same index. Intended for testing purposes; you should not
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* need to use this method directly.
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*/
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void GetFaces(std::vector<std::vector<size_t>>& out) const;
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private:
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static const size_t NO_VERTEX = ~0u;
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typedef std::vector<CVector3D> Vertices;
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typedef std::vector<size_t> FaceIndices;
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/// Collection of unique vertices that make up this shape.
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Vertices m_Vertices;
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/**
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* Holds the face definitions of this brush. Each face is a sequence of indices into m_Vertices that starts and ends with
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* the same vertex index, completing a loop through all the vertices that make up the face. This vector holds all the face
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* sequences back-to-back, thus looking something like 'x---xy--------yz--z' in the general case.
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*/
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FaceIndices m_Faces;
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struct Helper;
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};
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#endif // INCLUDED_BRUSH
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