0023316: OpenGl package can not be compiled on RedHat40-64
[occt.git] / src / OpenGl / OpenGl_TextureBufferArb.cxx
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5e27df78 1// Created by: Kirill GAVRILOV
2// Copyright (c) 2012 OPEN CASCADE SAS
3//
4// The content of this file is subject to the Open CASCADE Technology Public
5// License Version 6.5 (the "License"). You may not use the content of this file
6// except in compliance with the License. Please obtain a copy of the License
7// at http://www.opencascade.org and read it completely before using this file.
8//
9// The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
10// main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
11//
12// The Original Code and all software distributed under the License is
13// distributed on an "AS IS" basis, without warranty of any kind, and the
14// Initial Developer hereby disclaims all such warranties, including without
15// limitation, any warranties of merchantability, fitness for a particular
16// purpose or non-infringement. Please see the License for the specific terms
17// and conditions governing the rights and limitations under the License.
18
19#include <OpenGl_TextureBufferArb.hxx>
20
21#include <OpenGl_Context.hxx>
22#include <Standard_Assert.hxx>
23
24IMPLEMENT_STANDARD_HANDLE (OpenGl_TextureBufferArb, OpenGl_VertexBuffer)
25IMPLEMENT_STANDARD_RTTIEXT(OpenGl_TextureBufferArb, OpenGl_VertexBuffer)
26
27// =======================================================================
28// function : OpenGl_TextureBufferArb
29// purpose :
30// =======================================================================
31OpenGl_TextureBufferArb::OpenGl_TextureBufferArb()
32: OpenGl_VertexBuffer(),
33 myTextureId (NO_TEXTURE),
34 myTexFormat (GL_RGBA32F)
35{
36 //
37}
38
39// =======================================================================
40// function : ~OpenGl_TextureBufferArb
41// purpose :
42// =======================================================================
43OpenGl_TextureBufferArb::~OpenGl_TextureBufferArb()
44{
45 Release (NULL);
46}
47
48// =======================================================================
49// function : GetTarget
50// purpose :
51// =======================================================================
52GLenum OpenGl_TextureBufferArb::GetTarget() const
53{
54 return GL_TEXTURE_BUFFER_ARB; // GL_TEXTURE_BUFFER for OpenGL 3.1+
55}
56
57// =======================================================================
58// function : Release
59// purpose :
60// =======================================================================
61void OpenGl_TextureBufferArb::Release (const OpenGl_Context* theGlCtx)
62{
63 if (myTextureId != NO_TEXTURE)
64 {
65 // application can not handle this case by exception - this is bug in code
66 Standard_ASSERT_RETURN (theGlCtx != NULL,
67 "OpenGl_TextureBufferExt destroyed without GL context! Possible GPU memory leakage...",);
68
69 glDeleteTextures (1, &myTextureId);
70 myTextureId = NO_TEXTURE;
71 }
72 OpenGl_VertexBuffer::Release (theGlCtx);
73}
74
75// =======================================================================
76// function : Create
77// purpose :
78// =======================================================================
79bool OpenGl_TextureBufferArb::Create (const Handle(OpenGl_Context)& theGlCtx)
80{
81 if (!OpenGl_VertexBuffer::Create (theGlCtx))
82 {
83 return false;
84 }
85
86 if (myTextureId == NO_TEXTURE)
87 {
88 glGenTextures (1, &myTextureId);
89 }
90 return myTextureId != NO_TEXTURE;
91}
92
93// =======================================================================
94// function : Init
95// purpose :
96// =======================================================================
97bool OpenGl_TextureBufferArb::Init (const Handle(OpenGl_Context)& theGlCtx,
98 const GLuint theComponentsNb,
99 const GLsizei theElemsNb,
100 const GLfloat* theData)
101{
102 if (theComponentsNb != 1
103 && theComponentsNb != 2
104 && theComponentsNb != 4)
105 {
106 // unsupported format
107 return false;
108 }
109 else if (!Create (theGlCtx)
110 || !OpenGl_VertexBuffer::Init (theGlCtx, theComponentsNb, theElemsNb, theData))
111 {
112 return false;
113 }
114
115 switch (theComponentsNb)
116 {
117 case 1: myTexFormat = GL_R32F; break;
118 case 2: myTexFormat = GL_RG32F; break;
119 //case 3: myTexFormat = GL_RGB32F; break; // GL_ARB_texture_buffer_object_rgb32
120 case 4: myTexFormat = GL_RGBA32F; break;
121 }
122
123 Bind (theGlCtx);
124 BindTexture (theGlCtx);
125 theGlCtx->arbTBO->glTexBufferARB (GetTarget(), myTexFormat, myBufferId);
126 UnbindTexture (theGlCtx);
127 Unbind (theGlCtx);
128 return true;
129}
130
131// =======================================================================
132// function : BindTexture
133// purpose :
134// =======================================================================
135void OpenGl_TextureBufferArb::BindTexture (const Handle(OpenGl_Context)& theGlCtx,
136 const GLenum theTextureUnit) const
137{
138 theGlCtx->core20->glActiveTexture (theTextureUnit);
139 glBindTexture (GetTarget(), myTextureId);
140}
141
142// =======================================================================
143// function : UnbindTexture
144// purpose :
145// =======================================================================
146void OpenGl_TextureBufferArb::UnbindTexture (const Handle(OpenGl_Context)& theGlCtx,
147 const GLenum theTextureUnit) const
148{
149 theGlCtx->core20->glActiveTexture (theTextureUnit);
150 glBindTexture (GetTarget(), NO_TEXTURE);
151}