1

public/mathlib/polyhedron.h

@@ -0,0 +1,73 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//
+//=============================================================================//
+
+#ifndef POLYHEDRON_H_
+#define	POLYHEDRON_H_
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "mathlib/mathlib.h"
+
+
+
+struct Polyhedron_IndexedLine_t
+{
+	unsigned short iPointIndices[2];
+};
+
+struct Polyhedron_IndexedLineReference_t
+{
+	unsigned short iLineIndex;
+	unsigned char iEndPointIndex; //since two polygons reference any one line, one needs to traverse the line backwards, this flags that behavior
+};
+
+struct Polyhedron_IndexedPolygon_t
+{
+	unsigned short iFirstIndex;
+	unsigned short iIndexCount;
+	Vector polyNormal;
+};
+
+class CPolyhedron //made into a class because it's going virtual to support distinctions between temp and permanent versions
+{
+public:
+	Vector *pVertices;
+	Polyhedron_IndexedLine_t *pLines;
+	Polyhedron_IndexedLineReference_t *pIndices;
+	Polyhedron_IndexedPolygon_t *pPolygons;
+	
+	unsigned short iVertexCount;
+	unsigned short iLineCount;
+	unsigned short iIndexCount;
+	unsigned short iPolygonCount;
+
+	virtual ~CPolyhedron( void ) {};
+	virtual void Release( void ) = 0;
+	Vector Center( void );
+};
+
+class CPolyhedron_AllocByNew : public CPolyhedron
+{
+public:
+	virtual void Release( void );
+	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
+
+private:
+	CPolyhedron_AllocByNew( void ) { }; //CPolyhedron_AllocByNew::Allocate() is the only way to create one of these.
+};
+
+CPolyhedron *GeneratePolyhedronFromPlanes( const float *pOutwardFacingPlanes, int iPlaneCount, float fOnPlaneEpsilon, bool bUseTemporaryMemory = false ); //be sure to polyhedron->Release()
+CPolyhedron *ClipPolyhedron( const CPolyhedron *pExistingPolyhedron, const float *pOutwardFacingPlanes, int iPlaneCount, float fOnPlaneEpsilon, bool bUseTemporaryMemory = false ); //this does NOT modify/delete the existing polyhedron
+
+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
+
+
+#endif //#ifndef POLYHEDRON_H_
+