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[occt.git] / src / OpenGl / OpenGl_VertexBufferCompat.cxx
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7d3e64ef 1// Created by: Kirill GAVRILOV
2// Copyright (c) 2013-2014 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#include <OpenGl_VertexBufferCompat.hxx>
16
17#include <NCollection_AlignedAllocator.hxx>
18
7d3e64ef 19
92efcf78 20IMPLEMENT_STANDARD_RTTIEXT(OpenGl_VertexBufferCompat,OpenGl_VertexBuffer)
21
7d3e64ef 22// =======================================================================
23// function : OpenGl_VertexBufferCompat
24// purpose :
25// =======================================================================
26OpenGl_VertexBufferCompat::OpenGl_VertexBufferCompat()
27{
28 //
29}
30
31// =======================================================================
32// function : ~OpenGl_VertexBufferCompat
33// purpose :
34// =======================================================================
35OpenGl_VertexBufferCompat::~OpenGl_VertexBufferCompat()
36{
37 Release (NULL);
38}
39
40// =======================================================================
41// function : Create
42// purpose :
43// =======================================================================
44bool OpenGl_VertexBufferCompat::Create (const Handle(OpenGl_Context)& )
45{
46 if (myBufferId == NO_BUFFER)
47 {
48 myBufferId = (GLuint )-1; // dummy identifier...
49 Handle(NCollection_AlignedAllocator) anAlloc = new NCollection_AlignedAllocator (16);
50 myData = new NCollection_Buffer (anAlloc);
51 }
52 return myBufferId != NO_BUFFER;
53}
54
55// =======================================================================
56// function : Release
57// purpose :
58// =======================================================================
59void OpenGl_VertexBufferCompat::Release (OpenGl_Context* )
60{
61 if (myBufferId == NO_BUFFER)
62 {
63 return;
64 }
65
66 myOffset = NULL;
67 myBufferId = NO_BUFFER;
68 myData.Nullify();
69}
70
71// =======================================================================
72// function : Bind
73// purpose :
74// =======================================================================
75void OpenGl_VertexBufferCompat::Bind (const Handle(OpenGl_Context)& ) const
76{
77 //
78}
79
80// =======================================================================
81// function : Unbind
82// purpose :
83// =======================================================================
84void OpenGl_VertexBufferCompat::Unbind (const Handle(OpenGl_Context)& ) const
85{
86 //
87}
88
7d3e64ef 89// =======================================================================
90// function : initLink
91// purpose :
92// =======================================================================
93bool OpenGl_VertexBufferCompat::initLink (const Handle(NCollection_Buffer)& theData,
94 const GLuint theComponentsNb,
95 const GLsizei theElemsNb,
96 const GLenum theDataType)
97{
98 if (theData.IsNull())
99 {
100 myOffset = NULL;
101 return false;
102 }
103
104 if (myBufferId == NO_BUFFER)
105 {
106 myBufferId = (GLuint )-1; // dummy identifier...
107 }
108 myData = theData;
109 myDataType = theDataType;
110 myComponentsNb = theComponentsNb;
111 myElemsNb = theElemsNb;
112 myOffset = myData->ChangeData();
113 return true;
114}
115
116// =======================================================================
117// function : init
118// purpose :
119// =======================================================================
120bool OpenGl_VertexBufferCompat::init (const Handle(OpenGl_Context)& theCtx,
121 const GLuint theComponentsNb,
122 const GLsizei theElemsNb,
123 const void* theData,
124 const GLenum theDataType,
125 const GLsizei theStride)
126{
127 if (!Create (theCtx))
128 {
129 myOffset = NULL;
130 return false;
131 }
132
133 myDataType = theDataType;
134 myComponentsNb = theComponentsNb;
135 myElemsNb = theElemsNb;
136
137 const size_t aNbBytes = size_t(myElemsNb) * theStride;
138 if (!myData->Allocate (aNbBytes))
139 {
140 myOffset = NULL;
141 return false;
142 }
143
144 myOffset = myData->ChangeData();
145 if (theData != NULL)
146 {
147 memcpy (myData->ChangeData(), theData, aNbBytes);
148 }
149 return true;
150}
151
152// =======================================================================
153// function : subData
154// purpose :
155// =======================================================================
156bool OpenGl_VertexBufferCompat::subData (const Handle(OpenGl_Context)& ,
157 const GLsizei theElemFrom,
158 const GLsizei theElemsNb,
159 const void* theData,
160 const GLenum theDataType)
161{
162 if (!IsValid() || myDataType != theDataType ||
163 theElemFrom < 0 || ((theElemFrom + theElemsNb) > myElemsNb))
164 {
165 return false;
166 }
167 else if (theData == NULL)
168 {
169 return true;
170 }
171
172 const size_t aDataSize = sizeOfGlType (theDataType);
173 const size_t anOffset = size_t(theElemFrom) * size_t(myComponentsNb) * aDataSize;
174 const size_t aNbBytes = size_t(theElemsNb) * size_t(myComponentsNb) * aDataSize;
175 memcpy (myData->ChangeData() + anOffset, theData, aNbBytes);
176 return true;
177}