7d3e64ef |
1 | // Created by: Kirill GAVRILOV |
2 | // Copyright (c) 2014 OPEN CASCADE SAS |
3 | // |
4 | // This file is part of Open CASCADE Technology software library. |
5 | // |
6 | // This library is free software; you can redistribute it and/or modify it under |
7 | // the terms of the GNU Lesser General Public License version 2.1 as published |
8 | // by the Free Software Foundation, with special exception defined in the file |
9 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
10 | // distribution for complete text of the license and disclaimer of any warranty. |
11 | // |
12 | // Alternatively, this file may be used under the terms of Open CASCADE |
13 | // commercial license or contractual agreement. |
14 | |
15 | #ifndef _OpenGl_VertexBufferCompat_HeaderFile |
16 | #define _OpenGl_VertexBufferCompat_HeaderFile |
17 | |
18 | #include <OpenGl_VertexBuffer.hxx> |
19 | |
20 | //! Compatibility layer for old OpenGL without VBO. |
21 | //! Make sure to pass pointer from GetDataOffset() instead of NULL. |
22 | //! Method GetDataOffset() returns pointer to real data in this class |
23 | //! (while base class OpenGl_VertexBuffer always return NULL). |
24 | //! |
25 | //! Methods Bind()/Unbind() do nothing (do not affect OpenGL state) |
26 | //! and ::GetTarget() is never used. |
27 | //! For this reason there is no analog for OpenGl_IndexBuffer. |
28 | //! Just pass GetDataOffset() to glDrawElements() directly as last argument. |
29 | //! |
30 | //! Class overrides methods init() and subData() to copy data into own memory buffer. |
31 | //! Extra method initLink() might be used to pass existing buffer through handle without copying the data. |
32 | //! |
33 | //! Method Create() creates dummy identifier for this object which should NOT be passed to OpenGL functions. |
34 | class OpenGl_VertexBufferCompat : public OpenGl_VertexBuffer |
35 | { |
36 | |
37 | public: |
38 | |
39 | //! Create uninitialized VBO. |
40 | Standard_EXPORT OpenGl_VertexBufferCompat(); |
41 | |
42 | //! Destroy object. |
43 | Standard_EXPORT virtual ~OpenGl_VertexBufferCompat(); |
44 | |
45 | //! Creates VBO name (id) if not yet generated. |
46 | //! Data should be initialized by another method. |
79104795 |
47 | Standard_EXPORT bool Create (const Handle(OpenGl_Context)& theGlCtx) Standard_OVERRIDE; |
7d3e64ef |
48 | |
49 | //! Destroy object - will release memory if any. |
50 | Standard_EXPORT virtual void Release (OpenGl_Context* theGlCtx) Standard_OVERRIDE; |
51 | |
52 | //! Bind this VBO. |
53 | Standard_EXPORT virtual void Bind (const Handle(OpenGl_Context)& theGlCtx) const Standard_OVERRIDE; |
54 | |
55 | //! Unbind this VBO. |
56 | Standard_EXPORT virtual void Unbind (const Handle(OpenGl_Context)& theGlCtx) const Standard_OVERRIDE; |
57 | |
58 | public: //! @name advanced methods |
59 | |
60 | //! Initialize buffer with existing data. |
61 | //! Data will NOT be copied by this method! |
62 | Standard_EXPORT bool initLink (const Handle(NCollection_Buffer)& theData, |
63 | const GLuint theComponentsNb, |
64 | const GLsizei theElemsNb, |
65 | const GLenum theDataType); |
66 | |
67 | //! Initialize buffer with new data (data will be copied). |
68 | Standard_EXPORT virtual bool init (const Handle(OpenGl_Context)& theGlCtx, |
69 | const GLuint theComponentsNb, |
70 | const GLsizei theElemsNb, |
71 | const void* theData, |
72 | const GLenum theDataType, |
73 | const GLsizei theStride) Standard_OVERRIDE; |
74 | |
75 | //! Update part of the buffer with new data. |
76 | Standard_EXPORT virtual bool subData (const Handle(OpenGl_Context)& theGlCtx, |
77 | const GLsizei theElemFrom, |
78 | const GLsizei theElemsNb, |
79 | const void* theData, |
80 | const GLenum theDataType) Standard_OVERRIDE; |
81 | |
82 | protected: |
83 | |
84 | Handle(NCollection_Buffer) myData; //!< buffer data |
85 | |
86 | public: |
87 | |
ec357c5c |
88 | DEFINE_STANDARD_RTTI(OpenGl_VertexBufferCompat, OpenGl_VertexBuffer) // Type definition |
7d3e64ef |
89 | |
90 | }; |
91 | |
92 | DEFINE_STANDARD_HANDLE(OpenGl_VertexBufferCompat, OpenGl_VertexBuffer) |
93 | |
94 | #endif // _OpenGl_VertexBufferCompat_HeaderFile |