155 lines
4.3 KiB
C
155 lines
4.3 KiB
C
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//////////////////////////////////////////////////////////////////////////////////
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// SPARK particle engine //
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// Copyright (C) 2008-2009 - Julien Fryer - julienfryer@gmail.com //
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// //
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// This software is provided 'as-is', without any express or implied //
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// warranty. In no event will the authors be held liable for any damages //
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// arising from the use of this software. //
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// //
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// Permission is granted to anyone to use this software for any purpose, //
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// including commercial applications, and to alter it and redistribute it //
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// freely, subject to the following restrictions: //
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// //
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// 1. The origin of this software must not be misrepresented; you must not //
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// claim that you wrote the original software. If you use this software //
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// in a product, an acknowledgment in the product documentation would be //
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// appreciated but is not required. //
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// 2. Altered source versions must be plainly marked as such, and must not be //
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// misrepresented as being the original software. //
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// 3. This notice may not be removed or altered from any source distribution. //
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//////////////////////////////////////////////////////////////////////////////////
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#ifndef H_SPK_AABOX
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#define H_SPK_AABOX
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#include "Core/SPK_Zone.h"
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namespace SPK
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{
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/**
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* @class AABox
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* @brief A Zone defining an axis-aligned Box
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*
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* An AABox is defined by its center and a dimension in each axis.
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*/
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class SPK_PREFIX AABox : public Zone
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{
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SPK_IMPLEMENT_REGISTERABLE(AABox)
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public :
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/////////////////
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// Constructor //
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/////////////////
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/**
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* @brief Constructor of AABox
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* @param position : the position of the AABox
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* @param dimension : the dimension of the AABox
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*/
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AABox(const Vector3D& position = Vector3D(0.0f,0.0f,0.0f),const Vector3D& dimension = Vector3D(0.0f,0.0f,0.0f));
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/**
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* @brief Creates and registers a new AABox
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* @param position : the position of the AABox
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* @param dimension : the dimension of the AABox
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* @since 1.04.00
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*/
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static inline AABox* create(const Vector3D& position = Vector3D(0.0f,0.0f,0.0f),const Vector3D& dimension = Vector3D(0.0f,0.0f,0.0f));
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////////////
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// Setter //
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////////////
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/**
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* @brief Sets the dimensions of this AABox
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*
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* The negative dimensions are clamped to 0.<br>
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* An AABox with 0 as its 3 dimensions is equivalent to a Point
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*
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* @param dimension : the dimensions of this AABox
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*/
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void setDimension(const Vector3D& dimension);
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////////////
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// Getter //
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////////////
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/**
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* @brief Gets the dimensions of this AABox
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* @return the dimensions of this AABox
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*/
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inline const Vector3D& getDimension() const;
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///////////////
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// Interface //
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///////////////
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virtual void generatePosition(Particle& particle,bool full) const;
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virtual bool contains(const Vector3D& v) const;
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virtual bool intersects(const Vector3D& v0,const Vector3D& v1,Vector3D* intersection,Vector3D* normal) const;
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virtual void moveAtBorder(Vector3D& v,bool inside) const;
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virtual Vector3D computeNormal(const Vector3D& point) const;
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private :
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Vector3D dimension;
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inline bool slabIntersects(float p0,float p1,float bMin,float bMax,float& tEnter,float& tExit,int& firstAxis,int axis) const;
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};
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inline AABox* AABox::create(const Vector3D& position,const Vector3D& dimension)
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{
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AABox* obj = new AABox(position,dimension);
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registerObject(obj);
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return obj;
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}
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inline const Vector3D& AABox::getDimension() const
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{
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return dimension;
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}
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inline bool AABox::slabIntersects(float p0,float p1,float bMin,float bMax,float& tEnter,float& tExit,int& firstAxis,int axis) const
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{
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float dir = p1 - p0;
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if (dir == 0.0f)
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{
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if ((p0 < bMin)||(p0 > bMax))
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return false;
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return true;
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}
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float t0 = (bMin - p0) / dir;
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float t1 = (bMax - p0) / dir;
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if (t0 > t1)
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{
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std::swap(t0,t1);
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axis += 3;
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}
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if ((t1 < tEnter)||(t0 > tExit))
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return false;
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if (t0 > tEnter)
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{
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tEnter = t0;
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firstAxis = (firstAxis & 0xF0) | (axis & 0x0F);
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}
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if (t1 < tExit)
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{
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tExit = t1;
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firstAxis = (firstAxis & 0x0F) | ((axis << 4) & 0xF0);
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}
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return true;
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}
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}
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#endif
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