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111 lines
3.3 KiB
C++
111 lines
3.3 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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//=============================================================================
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#ifndef LEDGEWRITER_H
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#define LEDGEWRITER_H
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#ifdef _WIN32
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#pragma once
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#endif
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#include "vphysics/virtualmesh.h"
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// 2-sided triangle ledge rep
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struct triangleledge_t
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{
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IVP_Compact_Ledge ledge;
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IVP_Compact_Triangle faces[2];
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};
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// minimum footprint convex hull rep. Assume 8-bits of index space per edge/triangle/vert
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// NOTE: EACH ELEMENT OF THESE STRUCTS MUST BE 8-bits OR YOU HAVE TO WRITE SWAPPING CODE FOR
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// THE X360 IMPLEMENTATION. THERE IS NO SUCH CODE AS OF NOW.
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#pragma pack(1)
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struct packedtriangle_t
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{
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byte e0; // only bytes allowed see above
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byte e1;
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byte e2;
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byte opposite;
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};
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struct packededge_t
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{
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byte v0; // only bytes allowed see above
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byte v1;
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};
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struct packedhull_t
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{
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byte triangleCount; // only bytes allowed see above
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byte vtriCount;
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byte edgeCount;
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byte vedgeCount;
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byte baseVert;
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inline size_t DataSize() const
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{
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return (sizeof(packedtriangle_t) * triangleCount) + (sizeof(packededge_t)*edgeCount);
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}
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};
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struct virtualmeshhull_t
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{
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byte hullCount; // only bytes allowed see above
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byte pad[3];
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inline const packedhull_t *GetPackedHull( int hullIndex ) const
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{
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Assert(hullIndex<hullCount);
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return ((const packedhull_t *)(this+1)) + hullIndex;
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}
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inline const packedtriangle_t *GetPackedTriangles( int hullIndex ) const
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{
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const packedhull_t *pHull = GetPackedHull(0);
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// the first triangle is immediately following the memory for the packed hulls
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const byte *pStart = reinterpret_cast<const byte *>(GetPackedHull(0) + hullCount);
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for ( int i = 0; i < hullIndex; i++ )
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{
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pStart += pHull[i].DataSize();
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}
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return reinterpret_cast<const packedtriangle_t *>(pStart);
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}
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inline const packededge_t *GetPackedEdges( int hullIndex ) const
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{
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return reinterpret_cast<const packededge_t *>(GetPackedTriangles(hullIndex) + GetPackedHull(hullIndex)->triangleCount);
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}
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inline size_t TotalSize() const
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{
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size_t size = sizeof(*this) + sizeof(packedhull_t) * hullCount;
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for ( int i = 0; i < hullCount; i++ )
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{
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size += GetPackedHull(i)->DataSize();
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}
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return size;
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}
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};
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#pragma pack()
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// end
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// NOTE: EACH ELEMENT OF THE ABOVE STRUCTS MUST BE 8-bits OR YOU HAVE TO WRITE SWAPPING CODE FOR
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// THE X360 IMPLEMENTATION. THERE IS NO SUCH CODE AS OF NOW.
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// These statics are grouped in a class so they can be friends of IVP_Compact_Ledge and access its private data
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class CVPhysicsVirtualMeshWriter
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{
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public:
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// init a 2-sided triangle ledge
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static void InitTwoSidedTriangleLege( triangleledge_t *pOut, const IVP_Compact_Poly_Point *pPoints, int v0, int v1, int v2, int materialIndex );
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static virtualmeshhull_t *CreatePackedHullFromLedges( const virtualmeshlist_t &list, const IVP_Compact_Ledge **pLedges, int ledgeCount );
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static void UnpackCompactLedgeFromHull( IVP_Compact_Ledge *pLedge, int materialIndex, const IVP_Compact_Poly_Point *pPointList, const virtualmeshhull_t *pHullHeader, int hullIndex, bool isVirtualLedge );
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static void DestroyPackedHull( virtualmeshhull_t *pHull );
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static bool LedgeCanBePacked(const IVP_Compact_Ledge *pLedge, const virtualmeshlist_t &list);
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static unsigned int UnpackLedgeListFromHull( byte *pOut, virtualmeshhull_t *pHull, IVP_Compact_Poly_Point *pPoints );
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};
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#endif // LEDGEWRITER_H
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