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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 | #ifndef OpenGl_Quadric_Header |
17 | #define OpenGl_Quadric_Header |
18 | |
19 | #include <OpenGl_PrimitiveArray.hxx> |
20 | |
21 | //! Class for rendering of arbitrary primitive array. |
22 | //! Tool class for generating tessellation of quadric surface. |
23 | class OpenGl_Quadric : public OpenGl_PrimitiveArray |
24 | { |
25 | public: |
26 | |
27 | //! Creates undefined abstract quadric surface |
28 | Standard_EXPORT OpenGl_Quadric(); |
29 | |
30 | //! Returns true if quadric has been defined |
31 | Standard_Boolean IsDefined() const { return myNbSlices != 0; } |
32 | |
33 | //! Returns number of slices |
34 | Standard_Integer NbSlices() const { return myNbSlices; } |
35 | |
36 | //! Returns number of stacks |
37 | Standard_Integer NbStacks() const { return myNbStacks; } |
38 | |
39 | //! Returns total number of vertices |
40 | Standard_Integer NbVertices() const { return (myNbSlices + 1) * (myNbStacks + 1); } |
41 | |
42 | //! Returns total number of triangles |
43 | Standard_Integer NbTriangles() const { return myNbSlices * myNbStacks * 2; } |
44 | |
45 | //! Release GL resources |
46 | virtual void Release (OpenGl_Context* theContext) Standard_OVERRIDE; |
47 | |
48 | protected: |
49 | |
50 | //! Returns surface point for the given parameters. |
51 | virtual OpenGl_Vec3 evalVertex (const Standard_ShortReal theU, |
52 | const Standard_ShortReal theV) const = 0; |
53 | |
54 | //! Returns surface normal for the given parameters. |
55 | virtual OpenGl_Vec3 evalNormal (const Standard_ShortReal theU, |
56 | const Standard_ShortReal theV) const = 0; |
57 | |
58 | //! Initialize primitive. |
59 | Standard_EXPORT Standard_Boolean init (const Standard_Integer theNbSlices, |
60 | const Standard_Integer theNbStacks); |
61 | |
62 | private: |
63 | |
64 | //! Initialize arrays. |
65 | Standard_Boolean createArrays() const; |
66 | |
67 | private: |
68 | |
69 | Standard_Integer myNbSlices; //!< Number of slices (u partitions) |
70 | Standard_Integer myNbStacks; //!< Number of stacks (v partitions) |
71 | |
72 | }; |
73 | |
74 | #endif // OpenGl_Quadric_Header |