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1 | // Created by: Kirill GAVRILOV |
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2 | // Copyright (c) 2013-2014 OPEN CASCADE SAS |
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3 | // |
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4 | // This file is part of Open CASCADE Technology software library. |
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5 | // |
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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 |
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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. |
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11 | // |
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12 | // Alternatively, this file may be used under the terms of Open CASCADE |
13 | // commercial license or contractual agreement. |
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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 | // ======================================================================= |
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57 | void OpenGl_TextureBufferArb::Release (OpenGl_Context* theGlCtx) |
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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 | |
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65 | if (theGlCtx->IsValid()) |
66 | { |
67 | glDeleteTextures (1, &myTextureId); |
68 | } |
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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 | { |
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101 | #if !defined(GL_ES_VERSION_2_0) |
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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); |
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125 | theGlCtx->arbTBO->glTexBuffer (GetTarget(), myTexFormat, myBufferId); |
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126 | UnbindTexture (theGlCtx); |
127 | Unbind (theGlCtx); |
128 | return true; |
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129 | #else |
130 | return false; |
131 | #endif |
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132 | } |
133 | |
134 | // ======================================================================= |
135 | // function : Init |
136 | // purpose : |
137 | // ======================================================================= |
138 | bool OpenGl_TextureBufferArb::Init (const Handle(OpenGl_Context)& theGlCtx, |
139 | const GLuint theComponentsNb, |
140 | const GLsizei theElemsNb, |
141 | const GLuint* theData) |
142 | { |
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143 | #if !defined(GL_ES_VERSION_2_0) |
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144 | if (theComponentsNb != 1 |
145 | && theComponentsNb != 2 |
146 | && theComponentsNb != 3 |
147 | && theComponentsNb != 4) |
148 | { |
149 | // unsupported format |
150 | return false; |
151 | } |
152 | else if (!Create (theGlCtx) |
153 | || !OpenGl_VertexBuffer::Init (theGlCtx, theComponentsNb, theElemsNb, theData)) |
154 | { |
155 | return false; |
156 | } |
157 | |
158 | switch (theComponentsNb) |
159 | { |
160 | case 1: myTexFormat = GL_R32I; break; |
161 | case 2: myTexFormat = GL_RG32I; break; |
162 | case 3: myTexFormat = GL_RGB32I; break; |
163 | case 4: myTexFormat = GL_RGBA32I; break; |
164 | } |
165 | |
166 | Bind (theGlCtx); |
167 | BindTexture (theGlCtx); |
168 | theGlCtx->arbTBO->glTexBuffer (GetTarget(), myTexFormat, myBufferId); |
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169 | UnbindTexture (theGlCtx); |
170 | Unbind (theGlCtx); |
171 | return true; |
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172 | #else |
173 | return false; |
174 | #endif |
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175 | } |
176 | |
177 | // ======================================================================= |
178 | // function : BindTexture |
179 | // purpose : |
180 | // ======================================================================= |
181 | void OpenGl_TextureBufferArb::BindTexture (const Handle(OpenGl_Context)& theGlCtx, |
182 | const GLenum theTextureUnit) const |
183 | { |
184 | theGlCtx->core20->glActiveTexture (theTextureUnit); |
185 | glBindTexture (GetTarget(), myTextureId); |
186 | } |
187 | |
188 | // ======================================================================= |
189 | // function : UnbindTexture |
190 | // purpose : |
191 | // ======================================================================= |
192 | void OpenGl_TextureBufferArb::UnbindTexture (const Handle(OpenGl_Context)& theGlCtx, |
193 | const GLenum theTextureUnit) const |
194 | { |
195 | theGlCtx->core20->glActiveTexture (theTextureUnit); |
196 | glBindTexture (GetTarget(), NO_TEXTURE); |
197 | } |