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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 | { |
22 | public: |
23 | |
24 | //! Empty constructor. |
25 | Graphic3d_IndexBuffer (const Handle(NCollection_BaseAllocator)& theAlloc) |
26 | : Graphic3d_Buffer (theAlloc) {} |
27 | |
28 | //! Allocates new empty index array |
29 | template<typename IndexType_t> |
30 | bool Init (const Standard_Integer theNbElems) |
31 | { |
32 | release(); |
33 | Stride = sizeof(IndexType_t); |
34 | if (Stride != sizeof(unsigned short) |
35 | && Stride != sizeof(unsigned int)) |
36 | { |
37 | return false; |
38 | } |
39 | |
40 | NbElements = theNbElems; |
41 | NbAttributes = 0; |
42 | if (NbElements != 0 |
43 | && !Allocate (size_t(Stride) * size_t(NbElements))) |
44 | { |
45 | release(); |
46 | return false; |
47 | } |
48 | return true; |
49 | } |
50 | |
51 | //! Access index at specified position |
52 | Standard_Integer Index (const Standard_Integer theIndex) const |
53 | { |
54 | return Stride == sizeof(unsigned short) |
55 | ? Standard_Integer(Value<unsigned short> (theIndex)) |
56 | : Standard_Integer(Value<unsigned int> (theIndex)); |
57 | } |
58 | |
59 | //! Change index at specified position |
60 | void SetIndex (const Standard_Integer theIndex, |
61 | const Standard_Integer theValue) |
62 | { |
63 | if (Stride == sizeof(unsigned short)) |
64 | { |
65 | ChangeValue<unsigned short> (theIndex) = (unsigned short )theValue; |
66 | } |
67 | else |
68 | { |
69 | ChangeValue<unsigned int> (theIndex) = (unsigned int )theValue; |
70 | } |
71 | } |
72 | |
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73 | public: |
74 | |
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75 | DEFINE_STANDARD_RTTI_INLINE(Graphic3d_IndexBuffer,Graphic3d_Buffer) // Type definition |
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76 | |
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77 | }; |
78 | |
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79 | DEFINE_STANDARD_HANDLE(Graphic3d_IndexBuffer, Graphic3d_Buffer) |
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80 | |
81 | #endif // _Graphic3d_IndexBuffer_HeaderFile |