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1 | // Created on: 2014-10-15 |
2 | // Created by: Denis Bogolepov |
3 | // Copyright (c) 2014 OPEN CASCADE SAS |
4 | // |
5 | // This file is part of Open CASCADE Technology software library. |
6 | // |
7 | // This library is free software; you can redistribute it and/or modify it under |
8 | // the terms of the GNU Lesser General Public License version 2.1 as published |
9 | // by the Free Software Foundation, with special exception defined in the file |
10 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
11 | // distribution for complete text of the license and disclaimer of any warranty. |
12 | // |
13 | // Alternatively, this file may be used under the terms of Open CASCADE |
14 | // commercial license or contractual agreement. |
15 | |
16 | #include <OpenGl_Quadric.hxx> |
17 | |
18 | #include <NCollection_AlignedAllocator.hxx> |
19 | |
20 | // ======================================================================= |
21 | // function : OpenGl_Quadric |
22 | // purpose : |
23 | // ======================================================================= |
24 | OpenGl_Quadric::OpenGl_Quadric() |
25 | : OpenGl_PrimitiveArray (NULL, Graphic3d_TOPA_TRIANGLES, NULL, NULL, NULL), |
26 | myNbSlices (0), |
27 | myNbStacks (0) |
28 | { |
29 | myDrawMode = GL_TRIANGLES; |
30 | } |
31 | |
32 | // ======================================================================= |
33 | // function : init |
34 | // purpose : |
35 | // ======================================================================= |
36 | Standard_Boolean OpenGl_Quadric::init (const Standard_Integer theNbSlices, |
37 | const Standard_Integer theNbStacks) |
38 | { |
39 | myNbSlices = theNbSlices; |
40 | myNbStacks = theNbStacks; |
41 | return createArrays(); |
42 | } |
43 | |
44 | // ======================================================================= |
45 | // function : Release |
46 | // purpose : |
47 | // ======================================================================= |
48 | void OpenGl_Quadric::Release (OpenGl_Context* theContext) |
49 | { |
50 | myNbSlices = 0; |
51 | myNbStacks = 0; |
52 | OpenGl_PrimitiveArray::Release (theContext); |
53 | } |
54 | |
55 | // ======================================================================= |
56 | // function : createArrays |
57 | // purpose : |
58 | // ======================================================================= |
59 | Standard_Boolean OpenGl_Quadric::createArrays() const |
60 | { |
61 | // Evaluate surface points and normals |
62 | Graphic3d_Attribute anAttribsInfo[] = |
63 | { |
64 | { Graphic3d_TOA_POS, Graphic3d_TOD_VEC3 }, |
65 | { Graphic3d_TOA_NORM, Graphic3d_TOD_VEC3 } |
66 | }; |
67 | Handle(NCollection_AlignedAllocator) anAlloc = new NCollection_AlignedAllocator (16); |
68 | myAttribs = new Graphic3d_Buffer (anAlloc); |
69 | myIndices = new Graphic3d_IndexBuffer (anAlloc); |
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70 | if (!myAttribs->Init (NbVertices(), anAttribsInfo, 2)) |
71 | { |
72 | return Standard_False; |
73 | } |
74 | |
75 | const Standard_Integer aNbIndices = NbTriangles() * 3; |
76 | if (aNbIndices < Standard_Integer(USHRT_MAX)) |
77 | { |
78 | if (!myIndices->Init<GLushort> (aNbIndices)) |
79 | { |
80 | return Standard_False; |
81 | } |
82 | } |
83 | else if (!myIndices->Init<GLuint> (aNbIndices)) |
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84 | { |
85 | return Standard_False; |
86 | } |
87 | |
88 | const Standard_ShortReal aStepU = 1.0f / myNbSlices; |
89 | const Standard_ShortReal aStepV = 1.0f / myNbStacks; |
90 | for (Standard_Integer aU = 0; aU <= myNbSlices; ++aU) |
91 | { |
92 | const Standard_ShortReal aParamU = aU * aStepU; |
93 | for (Standard_Integer aV = 0; aV <= myNbStacks; ++aV) |
94 | { |
95 | const Standard_ShortReal aParamV = aV * aStepV; |
96 | const Standard_Integer aVertId = aU * (myNbStacks + 1) + aV; |
97 | Graphic3d_Vec3* aVertData = reinterpret_cast<Graphic3d_Vec3* >(myAttribs->changeValue (aVertId)); |
98 | aVertData[0] = evalVertex (aParamU, aParamV); |
99 | aVertData[1] = evalNormal (aParamU, aParamV); |
100 | } |
101 | } |
102 | |
103 | // Extract triangle indices |
104 | for (Standard_Integer aU = 0, aLastIndex = -1; aU < myNbSlices; ++aU) |
105 | { |
106 | for (Standard_Integer aV = 0; aV < myNbStacks; ++aV) |
107 | { |
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108 | myIndices->SetIndex (++aLastIndex, aU * (myNbStacks + 1) + aV); |
109 | myIndices->SetIndex (++aLastIndex, (aU + 1) * (myNbStacks + 1) + aV); |
110 | myIndices->SetIndex (++aLastIndex, (aU + 1) * (myNbStacks + 1) + (aV + 1)); |
111 | myIndices->SetIndex (++aLastIndex, (aU + 1) * (myNbStacks + 1) + (aV + 1)); |
112 | myIndices->SetIndex (++aLastIndex, aU * (myNbStacks + 1) + (aV + 1)); |
113 | myIndices->SetIndex (++aLastIndex, aU * (myNbStacks + 1) + aV); |
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114 | } |
115 | } |
116 | return Standard_True; |
117 | } |