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vphysics/ledgewriter.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================
+
+#ifndef LEDGEWRITER_H
+#define LEDGEWRITER_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "vphysics/virtualmesh.h"
+
+// 2-sided triangle ledge rep
+struct triangleledge_t
+{
+	IVP_Compact_Ledge		ledge;
+	IVP_Compact_Triangle	faces[2];
+};
+
+// minimum footprint convex hull rep.  Assume 8-bits of index space per edge/triangle/vert
+// NOTE: EACH ELEMENT OF THESE STRUCTS MUST BE 8-bits OR YOU HAVE TO WRITE SWAPPING CODE FOR 
+// THE X360 IMPLEMENTATION.  THERE IS NO SUCH CODE AS OF NOW.
+#pragma pack(1)
+struct packedtriangle_t
+{
+	byte e0;	// only bytes allowed see above
+	byte e1;
+	byte e2;
+	byte opposite;
+};
+
+struct packededge_t
+{
+	byte v0;	// only bytes allowed see above
+	byte v1;
+};
+
+struct packedhull_t
+{
+	byte triangleCount; // only bytes allowed see above
+	byte vtriCount;
+	byte edgeCount;
+	byte vedgeCount;
+	byte baseVert;
+	inline size_t DataSize() const
+	{
+		return (sizeof(packedtriangle_t) * triangleCount) + (sizeof(packededge_t)*edgeCount);
+	}
+};
+
+struct virtualmeshhull_t
+{
+	byte		hullCount; // only bytes allowed see above
+	byte		pad[3];
+	
+	inline const packedhull_t *GetPackedHull( int hullIndex ) const
+	{
+		Assert(hullIndex<hullCount);
+		return ((const packedhull_t *)(this+1)) + hullIndex;
+	}
+	inline const packedtriangle_t *GetPackedTriangles( int hullIndex ) const
+	{
+		const packedhull_t *pHull = GetPackedHull(0);
+		// the first triangle is immediately following the memory for the packed hulls
+		const byte *pStart = reinterpret_cast<const byte *>(GetPackedHull(0) + hullCount);
+		for ( int i = 0; i < hullIndex; i++ )
+		{
+			pStart += pHull[i].DataSize();
+		}
+		return reinterpret_cast<const packedtriangle_t *>(pStart);
+	}
+	inline const packededge_t *GetPackedEdges( int hullIndex ) const
+	{
+		return reinterpret_cast<const packededge_t *>(GetPackedTriangles(hullIndex) + GetPackedHull(hullIndex)->triangleCount);
+	}
+	inline size_t TotalSize() const
+	{
+		size_t size = sizeof(*this) + sizeof(packedhull_t) * hullCount;
+		for ( int i = 0; i < hullCount; i++ )
+		{
+			size += GetPackedHull(i)->DataSize();
+		}
+		return size;
+
+	}
+};
+
+#pragma pack()
+// end
+// NOTE: EACH ELEMENT OF THE ABOVE STRUCTS MUST BE 8-bits OR YOU HAVE TO WRITE SWAPPING CODE FOR 
+// THE X360 IMPLEMENTATION.  THERE IS NO SUCH CODE AS OF NOW.
+
+
+// These statics are grouped in a class so they can be friends of IVP_Compact_Ledge and access its private data
+class CVPhysicsVirtualMeshWriter
+{
+public:
+	// init a 2-sided triangle ledge
+	static void InitTwoSidedTriangleLege( triangleledge_t *pOut, const IVP_Compact_Poly_Point *pPoints, int v0, int v1, int v2, int materialIndex );
+
+	static virtualmeshhull_t *CreatePackedHullFromLedges( const virtualmeshlist_t &list, const IVP_Compact_Ledge **pLedges, int ledgeCount );
+	static void UnpackCompactLedgeFromHull( IVP_Compact_Ledge *pLedge, int materialIndex, const IVP_Compact_Poly_Point *pPointList, const virtualmeshhull_t *pHullHeader, int hullIndex, bool isVirtualLedge );
+	static void DestroyPackedHull( virtualmeshhull_t *pHull );
+	static bool LedgeCanBePacked(const IVP_Compact_Ledge *pLedge, const virtualmeshlist_t &list);
+	static unsigned int UnpackLedgeListFromHull( byte *pOut, virtualmeshhull_t *pHull, IVP_Compact_Poly_Point *pPoints );
+};
+
+#endif // LEDGEWRITER_H