1 /*
2 Open Asset Import Library (assimp)
3 ----------------------------------------------------------------------
4 
5 Copyright (c) 2006-2019, assimp team
6 
7 
8 All rights reserved.
9 
10 Redistribution and use of this software in source and binary forms,
11 with or without modification, are permitted provided that the
12 following conditions are met:
13 
14 * Redistributions of source code must retain the above
15   copyright notice, this list of conditions and the
16   following disclaimer.
17 
18 * Redistributions in binary form must reproduce the above
19   copyright notice, this list of conditions and the
20   following disclaimer in the documentation and/or other
21   materials provided with the distribution.
22 
23 * Neither the name of the assimp team, nor the names of its
24   contributors may be used to endorse or promote products
25   derived from this software without specific prior
26   written permission of the assimp team.
27 
28 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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39 
40 ----------------------------------------------------------------------
41 */
42 
43 /** @file Defines a helper class to compute a vertex-triangle adjacency map */
44 #ifndef AI_VTADJACENCY_H_INC
45 #define AI_VTADJACENCY_H_INC
46 
47 #include "BaseProcess.h"
48 #include <assimp/types.h>
49 #include <assimp/ai_assert.h>
50 
51 struct aiMesh;
52 struct aiFace;
53 
54 namespace Assimp    {
55 
56 // --------------------------------------------------------------------------------------------
57 /** @brief The VertexTriangleAdjacency class computes a vertex-triangle
58  *  adjacency map from a given index buffer.
59  *
60  *  @note Although it is called #VertexTriangleAdjacency, the current version does also
61  *    support arbitrary polygons. */
62 // --------------------------------------------------------------------------------------------
63 class ASSIMP_API VertexTriangleAdjacency {
64 public:
65     // ----------------------------------------------------------------------------
66     /** @brief Construction from an existing index buffer
67      *  @param pcFaces Index buffer
68      *  @param iNumFaces Number of faces in the buffer
69      *  @param iNumVertices Number of referenced vertices. This value
70      *    is computed automatically if 0 is specified.
71      *  @param bComputeNumTriangles If you want the class to compute
72      *    a list containing the number of referenced triangles per vertex
73      *    per vertex - pass true.  */
74     VertexTriangleAdjacency(aiFace* pcFaces,unsigned int iNumFaces,
75         unsigned int iNumVertices = 0,
76         bool bComputeNumTriangles = true);
77 
78     // ----------------------------------------------------------------------------
79     /** @brief Destructor */
80     ~VertexTriangleAdjacency();
81 
82     // ----------------------------------------------------------------------------
83     /** @brief Get all triangles adjacent to a vertex
84      *  @param iVertIndex Index of the vertex
85      *  @return A pointer to the adjacency list. */
GetAdjacentTriangles(unsigned int iVertIndex)86     unsigned int* GetAdjacentTriangles(unsigned int iVertIndex) const {
87         ai_assert(iVertIndex < mNumVertices);
88         return &mAdjacencyTable[ mOffsetTable[iVertIndex]];
89     }
90 
91     // ----------------------------------------------------------------------------
92     /** @brief Get the number of triangles that are referenced by
93      *    a vertex. This function returns a reference that can be modified
94      *  @param iVertIndex Index of the vertex
95      *  @return Number of referenced triangles */
GetNumTrianglesPtr(unsigned int iVertIndex)96     unsigned int& GetNumTrianglesPtr(unsigned int iVertIndex) {
97         ai_assert( iVertIndex < mNumVertices );
98         ai_assert( nullptr != mLiveTriangles );
99         return mLiveTriangles[iVertIndex];
100     }
101 
102     //! Offset table
103     unsigned int* mOffsetTable;
104 
105     //! Adjacency table
106     unsigned int* mAdjacencyTable;
107 
108     //! Table containing the number of referenced triangles per vertex
109     unsigned int* mLiveTriangles;
110 
111     //! Debug: Number of referenced vertices
112     unsigned int mNumVertices;
113 };
114 
115 } //! ns Assimp
116 
117 #endif // !! AI_VTADJACENCY_H_INC
118