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 | |
20 | IMPLEMENT_STANDARD_HANDLE (OpenGl_TextureBufferArb, OpenGl_VertexBuffer) |
21 | IMPLEMENT_STANDARD_RTTIEXT(OpenGl_TextureBufferArb, OpenGl_VertexBuffer) |
22 | |
23 | // ======================================================================= |
24 | // function : OpenGl_TextureBufferArb |
25 | // purpose : |
26 | // ======================================================================= |
27 | OpenGl_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 | // ======================================================================= |
39 | OpenGl_TextureBufferArb::~OpenGl_TextureBufferArb() |
40 | { |
41 | Release (NULL); |
42 | } |
43 | |
44 | // ======================================================================= |
45 | // function : GetTarget |
46 | // purpose : |
47 | // ======================================================================= |
48 | GLenum 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 |
57 | void 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 | // ======================================================================= |
78 | bool 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 | // ======================================================================= |
96 | bool 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 | // ======================================================================= |
142 | bool 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 | // ======================================================================= |
188 | void OpenGl_TextureBufferArb::BindTexture (const Handle(OpenGl_Context)& theGlCtx, |
189 | const GLenum theTextureUnit) const |
190 | { |
4e1523ef |
191 | theGlCtx->core20fwd->glActiveTexture (theTextureUnit); |
5e27df78 |
192 | glBindTexture (GetTarget(), myTextureId); |
193 | } |
194 | |
195 | // ======================================================================= |
196 | // function : UnbindTexture |
197 | // purpose : |
198 | // ======================================================================= |
199 | void OpenGl_TextureBufferArb::UnbindTexture (const Handle(OpenGl_Context)& theGlCtx, |
200 | const GLenum theTextureUnit) const |
201 | { |
4e1523ef |
202 | theGlCtx->core20fwd->glActiveTexture (theTextureUnit); |
5e27df78 |
203 | glBindTexture (GetTarget(), NO_TEXTURE); |
204 | } |