74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//
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//=============================================================================//
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#ifndef POLYHEDRON_H_
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#define POLYHEDRON_H_
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#ifdef _WIN32
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#pragma once
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#endif
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#include "mathlib/mathlib.h"
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struct Polyhedron_IndexedLine_t
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{
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unsigned short iPointIndices[2];
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};
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struct Polyhedron_IndexedLineReference_t
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{
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unsigned short iLineIndex;
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unsigned char iEndPointIndex; //since two polygons reference any one line, one needs to traverse the line backwards, this flags that behavior
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};
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struct Polyhedron_IndexedPolygon_t
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{
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unsigned short iFirstIndex;
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unsigned short iIndexCount;
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Vector polyNormal;
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};
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class CPolyhedron //made into a class because it's going virtual to support distinctions between temp and permanent versions
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{
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public:
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Vector *pVertices;
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Polyhedron_IndexedLine_t *pLines;
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Polyhedron_IndexedLineReference_t *pIndices;
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Polyhedron_IndexedPolygon_t *pPolygons;
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unsigned short iVertexCount;
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unsigned short iLineCount;
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unsigned short iIndexCount;
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unsigned short iPolygonCount;
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virtual ~CPolyhedron( void ) {};
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virtual void Release( void ) = 0;
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Vector Center( void );
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};
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class CPolyhedron_AllocByNew : public CPolyhedron
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{
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public:
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virtual void Release( void );
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static CPolyhedron_AllocByNew *Allocate( unsigned short iVertices, unsigned short iLines, unsigned short iIndices, unsigned short iPolygons ); //creates the polyhedron along with enough memory to hold all it's data in a single allocation
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private:
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CPolyhedron_AllocByNew( void ) { }; //CPolyhedron_AllocByNew::Allocate() is the only way to create one of these.
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};
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CPolyhedron *GeneratePolyhedronFromPlanes( const float *pOutwardFacingPlanes, int iPlaneCount, float fOnPlaneEpsilon, bool bUseTemporaryMemory = false ); //be sure to polyhedron->Release()
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CPolyhedron *ClipPolyhedron( const CPolyhedron *pExistingPolyhedron, const float *pOutwardFacingPlanes, int iPlaneCount, float fOnPlaneEpsilon, bool bUseTemporaryMemory = false ); //this does NOT modify/delete the existing polyhedron
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CPolyhedron *GetTempPolyhedron( unsigned short iVertices, unsigned short iLines, unsigned short iIndices, unsigned short iPolygons ); //grab the temporary polyhedron. Avoids new/delete for quick work. Can only be in use by one chunk of code at a time
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#endif //#ifndef POLYHEDRON_H_
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