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1 | // Copyright (c) 2014 OPEN CASCADE SAS |
2 | // |
3 | // This file is part of Open CASCADE Technology software library. |
4 | // |
5 | // This library is free software; you can redistribute it and/or modify it under |
6 | // the terms of the GNU Lesser General Public License version 2.1 as published |
7 | // by the Free Software Foundation, with special exception defined in the file |
8 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
9 | // distribution for complete text of the license and disclaimer of any warranty. |
10 | // |
11 | // Alternatively, this file may be used under the terms of Open CASCADE |
12 | // commercial license or contractual agreement. |
13 | |
14 | #ifndef _Graphic3d_IndexBuffer_HeaderFile |
15 | #define _Graphic3d_IndexBuffer_HeaderFile |
16 | |
17 | #include <Graphic3d_Buffer.hxx> |
18 | |
19 | //! Index buffer. |
20 | class Graphic3d_IndexBuffer : public Graphic3d_Buffer |
21 | { |
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22 | DEFINE_STANDARD_RTTIEXT(Graphic3d_IndexBuffer, Graphic3d_Buffer) |
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23 | public: |
24 | |
25 | //! Empty constructor. |
26 | Graphic3d_IndexBuffer (const Handle(NCollection_BaseAllocator)& theAlloc) |
27 | : Graphic3d_Buffer (theAlloc) {} |
28 | |
29 | //! Allocates new empty index array |
30 | template<typename IndexType_t> |
31 | bool Init (const Standard_Integer theNbElems) |
32 | { |
33 | release(); |
34 | Stride = sizeof(IndexType_t); |
35 | if (Stride != sizeof(unsigned short) |
36 | && Stride != sizeof(unsigned int)) |
37 | { |
38 | return false; |
39 | } |
40 | |
41 | NbElements = theNbElems; |
42 | NbAttributes = 0; |
43 | if (NbElements != 0 |
44 | && !Allocate (size_t(Stride) * size_t(NbElements))) |
45 | { |
46 | release(); |
47 | return false; |
48 | } |
49 | return true; |
50 | } |
51 | |
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52 | //! Allocates new empty index array |
53 | bool InitInt32 (const Standard_Integer theNbElems) |
54 | { |
55 | return Init<int> (theNbElems); |
56 | } |
57 | |
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58 | //! Access index at specified position |
59 | Standard_Integer Index (const Standard_Integer theIndex) const |
60 | { |
61 | return Stride == sizeof(unsigned short) |
62 | ? Standard_Integer(Value<unsigned short> (theIndex)) |
63 | : Standard_Integer(Value<unsigned int> (theIndex)); |
64 | } |
65 | |
66 | //! Change index at specified position |
67 | void SetIndex (const Standard_Integer theIndex, |
68 | const Standard_Integer theValue) |
69 | { |
70 | if (Stride == sizeof(unsigned short)) |
71 | { |
72 | ChangeValue<unsigned short> (theIndex) = (unsigned short )theValue; |
73 | } |
74 | else |
75 | { |
76 | ChangeValue<unsigned int> (theIndex) = (unsigned int )theValue; |
77 | } |
78 | } |
79 | |
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80 | |
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81 | }; |
82 | |
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83 | DEFINE_STANDARD_HANDLE(Graphic3d_IndexBuffer, Graphic3d_Buffer) |
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84 | |
85 | #endif // _Graphic3d_IndexBuffer_HeaderFile |