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[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
5e27df78 20
92efcf78 21IMPLEMENT_STANDARD_RTTIEXT(OpenGl_TextureBufferArb,OpenGl_VertexBuffer)
22
5e27df78 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{
20aeeb7b 50 return GL_TEXTURE_BUFFER; // GL_TEXTURE_BUFFER for OpenGL 3.1+, OpenGL ES 3.2
5e27df78 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{
20aeeb7b 101 if (theGlCtx->arbTBO == NULL)
102 {
103 return false;
104 }
105 else if (theComponentsNb < 1
106 || theComponentsNb > 4)
5e27df78 107 {
108 // unsupported format
109 return false;
110 }
25ef750e 111 else if (theComponentsNb == 3
112 && !theGlCtx->arbTboRGB32)
113 {
114 return false;
115 }
5e27df78 116 else if (!Create (theGlCtx)
117 || !OpenGl_VertexBuffer::Init (theGlCtx, theComponentsNb, theElemsNb, theData))
118 {
119 return false;
120 }
121
122 switch (theComponentsNb)
123 {
124 case 1: myTexFormat = GL_R32F; break;
125 case 2: myTexFormat = GL_RG32F; break;
25ef750e 126 case 3: myTexFormat = GL_RGB32F; break; // GL_ARB_texture_buffer_object_rgb32
5e27df78 127 case 4: myTexFormat = GL_RGBA32F; break;
128 }
129
130 Bind (theGlCtx);
cc8cbabe 131 BindTexture (theGlCtx, Graphic3d_TextureUnit_0);
01ca42b2 132 theGlCtx->arbTBO->glTexBuffer (GetTarget(), myTexFormat, myBufferId);
cc8cbabe 133 UnbindTexture(theGlCtx, Graphic3d_TextureUnit_0);
fc73a202 134 Unbind (theGlCtx);
135 return true;
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{
20aeeb7b 147 if (theGlCtx->arbTBO == NULL)
148 {
149 return false;
150 }
151 else if (theComponentsNb < 1
152 || theComponentsNb > 4)
fc73a202 153 {
154 // unsupported format
155 return false;
156 }
25ef750e 157 else if (theComponentsNb == 3
158 && !theGlCtx->arbTboRGB32)
159 {
160 return false;
161 }
fc73a202 162 else if (!Create (theGlCtx)
163 || !OpenGl_VertexBuffer::Init (theGlCtx, theComponentsNb, theElemsNb, theData))
164 {
165 return false;
166 }
167
168 switch (theComponentsNb)
169 {
170 case 1: myTexFormat = GL_R32I; break;
171 case 2: myTexFormat = GL_RG32I; break;
172 case 3: myTexFormat = GL_RGB32I; break;
173 case 4: myTexFormat = GL_RGBA32I; break;
174 }
175
176 Bind (theGlCtx);
cc8cbabe 177 BindTexture (theGlCtx, Graphic3d_TextureUnit_0);
fc73a202 178 theGlCtx->arbTBO->glTexBuffer (GetTarget(), myTexFormat, myBufferId);
cc8cbabe 179 UnbindTexture(theGlCtx, Graphic3d_TextureUnit_0);
df45f8db 180 Unbind (theGlCtx);
181 return true;
182}
183
184// =======================================================================
185// function : Init
186// purpose :
187// =======================================================================
188bool OpenGl_TextureBufferArb::Init (const Handle(OpenGl_Context)& theGlCtx,
189 const GLuint theComponentsNb,
190 const GLsizei theElemsNb,
191 const GLushort* theData)
192{
193 if (theGlCtx->arbTBO == NULL)
194 {
195 return false;
196 }
197 else if (theComponentsNb < 1
198 || theComponentsNb > 4)
199 {
200 // unsupported format
201 return false;
202 }
203 else if (!Create (theGlCtx)
204 || !OpenGl_VertexBuffer::Init (theGlCtx, theComponentsNb, theElemsNb, theData))
205 {
206 return false;
207 }
208
209 switch (theComponentsNb)
210 {
211 case 1: myTexFormat = GL_R16I; break;
212 case 2: myTexFormat = GL_RG16I; break;
213 case 3: myTexFormat = GL_RGB16I; break;
214 case 4: myTexFormat = GL_RGBA16I; break;
215 }
216
217 Bind (theGlCtx);
cc8cbabe 218 BindTexture (theGlCtx, Graphic3d_TextureUnit_0);
df45f8db 219 theGlCtx->arbTBO->glTexBuffer (GetTarget(), myTexFormat, myBufferId);
cc8cbabe 220 UnbindTexture(theGlCtx, Graphic3d_TextureUnit_0);
df45f8db 221 Unbind (theGlCtx);
222 return true;
223}
224
225// =======================================================================
226// function : Init
227// purpose :
228// =======================================================================
229bool OpenGl_TextureBufferArb::Init (const Handle(OpenGl_Context)& theGlCtx,
230 const GLuint theComponentsNb,
231 const GLsizei theElemsNb,
232 const GLubyte* theData)
233{
234 if (theGlCtx->arbTBO == NULL)
235 {
236 return false;
237 }
238 else if (theComponentsNb < 1
239 || theComponentsNb > 4)
240 {
241 // unsupported format
242 return false;
243 }
244 else if (!Create (theGlCtx)
245 || !OpenGl_VertexBuffer::Init (theGlCtx, theComponentsNb, theElemsNb, theData))
246 {
247 return false;
248 }
249
250 switch (theComponentsNb)
251 {
252 case 1: myTexFormat = GL_R8; break;
253 case 2: myTexFormat = GL_RG8; break;
254 case 3: myTexFormat = GL_RGB8; break;
255 case 4: myTexFormat = GL_RGBA8; break;
256 }
257
258 Bind (theGlCtx);
cc8cbabe 259 BindTexture (theGlCtx, Graphic3d_TextureUnit_0);
df45f8db 260 theGlCtx->arbTBO->glTexBuffer (GetTarget(), myTexFormat, myBufferId);
cc8cbabe 261 UnbindTexture(theGlCtx, Graphic3d_TextureUnit_0);
5e27df78 262 Unbind (theGlCtx);
263 return true;
264}
265
266// =======================================================================
267// function : BindTexture
268// purpose :
269// =======================================================================
270void OpenGl_TextureBufferArb::BindTexture (const Handle(OpenGl_Context)& theGlCtx,
cc8cbabe 271 const Graphic3d_TextureUnit theTextureUnit) const
5e27df78 272{
cc8cbabe 273 theGlCtx->core20fwd->glActiveTexture (GL_TEXTURE0 + theTextureUnit);
5e27df78 274 glBindTexture (GetTarget(), myTextureId);
275}
276
277// =======================================================================
278// function : UnbindTexture
279// purpose :
280// =======================================================================
281void OpenGl_TextureBufferArb::UnbindTexture (const Handle(OpenGl_Context)& theGlCtx,
cc8cbabe 282 const Graphic3d_TextureUnit theTextureUnit) const
5e27df78 283{
cc8cbabe 284 theGlCtx->core20fwd->glActiveTexture (GL_TEXTURE0 + theTextureUnit);
5e27df78 285 glBindTexture (GetTarget(), NO_TEXTURE);
286}