0025442: Visualization, TKOpenGl - prevent inclusion of system header glxext.h
[occt.git] / src / OpenGl / OpenGl_TextureBufferArb.cxx
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5e27df78 1// Created by: Kirill GAVRILOV
d5f74e42 2// Copyright (c) 2013-2014 OPEN CASCADE SAS
5e27df78 3//
973c2be1 4// This file is part of Open CASCADE Technology software library.
5e27df78 5//
d5f74e42 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
973c2be1 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.
5e27df78 11//
973c2be1 12// Alternatively, this file may be used under the terms of Open CASCADE
13// commercial license or contractual agreement.
5e27df78 14
15#include <OpenGl_TextureBufferArb.hxx>
16
17#include <OpenGl_Context.hxx>
18#include <Standard_Assert.hxx>
19
20IMPLEMENT_STANDARD_HANDLE (OpenGl_TextureBufferArb, OpenGl_VertexBuffer)
21IMPLEMENT_STANDARD_RTTIEXT(OpenGl_TextureBufferArb, OpenGl_VertexBuffer)
22
23// =======================================================================
24// function : OpenGl_TextureBufferArb
25// purpose :
26// =======================================================================
27OpenGl_TextureBufferArb::OpenGl_TextureBufferArb()
28: OpenGl_VertexBuffer(),
29 myTextureId (NO_TEXTURE),
30 myTexFormat (GL_RGBA32F)
31{
32 //
33}
34
35// =======================================================================
36// function : ~OpenGl_TextureBufferArb
37// purpose :
38// =======================================================================
39OpenGl_TextureBufferArb::~OpenGl_TextureBufferArb()
40{
41 Release (NULL);
42}
43
44// =======================================================================
45// function : GetTarget
46// purpose :
47// =======================================================================
48GLenum OpenGl_TextureBufferArb::GetTarget() const
49{
50 return GL_TEXTURE_BUFFER_ARB; // GL_TEXTURE_BUFFER for OpenGL 3.1+
51}
52
53// =======================================================================
54// function : Release
55// purpose :
56// =======================================================================
10b9c7df 57void OpenGl_TextureBufferArb::Release (OpenGl_Context* theGlCtx)
5e27df78 58{
59 if (myTextureId != NO_TEXTURE)
60 {
61 // application can not handle this case by exception - this is bug in code
62 Standard_ASSERT_RETURN (theGlCtx != NULL,
63 "OpenGl_TextureBufferExt destroyed without GL context! Possible GPU memory leakage...",);
64
fd4a6963 65 if (theGlCtx->IsValid())
66 {
67 glDeleteTextures (1, &myTextureId);
68 }
5e27df78 69 myTextureId = NO_TEXTURE;
70 }
71 OpenGl_VertexBuffer::Release (theGlCtx);
72}
73
74// =======================================================================
75// function : Create
76// purpose :
77// =======================================================================
78bool OpenGl_TextureBufferArb::Create (const Handle(OpenGl_Context)& theGlCtx)
79{
80 if (!OpenGl_VertexBuffer::Create (theGlCtx))
81 {
82 return false;
83 }
84
85 if (myTextureId == NO_TEXTURE)
86 {
87 glGenTextures (1, &myTextureId);
88 }
89 return myTextureId != NO_TEXTURE;
90}
91
92// =======================================================================
93// function : Init
94// purpose :
95// =======================================================================
96bool OpenGl_TextureBufferArb::Init (const Handle(OpenGl_Context)& theGlCtx,
97 const GLuint theComponentsNb,
98 const GLsizei theElemsNb,
99 const GLfloat* theData)
100{
ca3c13d1 101#if !defined(GL_ES_VERSION_2_0)
25ef750e 102 if (theComponentsNb < 1
103 || theComponentsNb > 4)
5e27df78 104 {
105 // unsupported format
106 return false;
107 }
25ef750e 108 else if (theComponentsNb == 3
109 && !theGlCtx->arbTboRGB32)
110 {
111 return false;
112 }
5e27df78 113 else if (!Create (theGlCtx)
114 || !OpenGl_VertexBuffer::Init (theGlCtx, theComponentsNb, theElemsNb, theData))
115 {
116 return false;
117 }
118
119 switch (theComponentsNb)
120 {
121 case 1: myTexFormat = GL_R32F; break;
122 case 2: myTexFormat = GL_RG32F; break;
25ef750e 123 case 3: myTexFormat = GL_RGB32F; break; // GL_ARB_texture_buffer_object_rgb32
5e27df78 124 case 4: myTexFormat = GL_RGBA32F; break;
125 }
126
127 Bind (theGlCtx);
128 BindTexture (theGlCtx);
01ca42b2 129 theGlCtx->arbTBO->glTexBuffer (GetTarget(), myTexFormat, myBufferId);
fc73a202 130 UnbindTexture (theGlCtx);
131 Unbind (theGlCtx);
132 return true;
ca3c13d1 133#else
134 return false;
135#endif
fc73a202 136}
137
138// =======================================================================
139// function : Init
140// purpose :
141// =======================================================================
142bool OpenGl_TextureBufferArb::Init (const Handle(OpenGl_Context)& theGlCtx,
143 const GLuint theComponentsNb,
144 const GLsizei theElemsNb,
145 const GLuint* theData)
146{
ca3c13d1 147#if !defined(GL_ES_VERSION_2_0)
25ef750e 148 if (theComponentsNb < 1
149 || theComponentsNb > 4)
fc73a202 150 {
151 // unsupported format
152 return false;
153 }
25ef750e 154 else if (theComponentsNb == 3
155 && !theGlCtx->arbTboRGB32)
156 {
157 return false;
158 }
fc73a202 159 else if (!Create (theGlCtx)
160 || !OpenGl_VertexBuffer::Init (theGlCtx, theComponentsNb, theElemsNb, theData))
161 {
162 return false;
163 }
164
165 switch (theComponentsNb)
166 {
167 case 1: myTexFormat = GL_R32I; break;
168 case 2: myTexFormat = GL_RG32I; break;
169 case 3: myTexFormat = GL_RGB32I; break;
170 case 4: myTexFormat = GL_RGBA32I; break;
171 }
172
173 Bind (theGlCtx);
174 BindTexture (theGlCtx);
175 theGlCtx->arbTBO->glTexBuffer (GetTarget(), myTexFormat, myBufferId);
5e27df78 176 UnbindTexture (theGlCtx);
177 Unbind (theGlCtx);
178 return true;
ca3c13d1 179#else
180 return false;
181#endif
5e27df78 182}
183
184// =======================================================================
185// function : BindTexture
186// purpose :
187// =======================================================================
188void OpenGl_TextureBufferArb::BindTexture (const Handle(OpenGl_Context)& theGlCtx,
189 const GLenum theTextureUnit) const
190{
191 theGlCtx->core20->glActiveTexture (theTextureUnit);
192 glBindTexture (GetTarget(), myTextureId);
193}
194
195// =======================================================================
196// function : UnbindTexture
197// purpose :
198// =======================================================================
199void OpenGl_TextureBufferArb::UnbindTexture (const Handle(OpenGl_Context)& theGlCtx,
200 const GLenum theTextureUnit) const
201{
202 theGlCtx->core20->glActiveTexture (theTextureUnit);
203 glBindTexture (GetTarget(), NO_TEXTURE);
204}