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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 | |
24 | IMPLEMENT_STANDARD_HANDLE (OpenGl_TextureBufferArb, OpenGl_VertexBuffer) |
25 | IMPLEMENT_STANDARD_RTTIEXT(OpenGl_TextureBufferArb, OpenGl_VertexBuffer) |
26 | |
27 | // ======================================================================= |
28 | // function : OpenGl_TextureBufferArb |
29 | // purpose : |
30 | // ======================================================================= |
31 | OpenGl_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 | // ======================================================================= |
43 | OpenGl_TextureBufferArb::~OpenGl_TextureBufferArb() |
44 | { |
45 | Release (NULL); |
46 | } |
47 | |
48 | // ======================================================================= |
49 | // function : GetTarget |
50 | // purpose : |
51 | // ======================================================================= |
52 | GLenum 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 | // ======================================================================= |
61 | void 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 | // ======================================================================= |
79 | bool 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 | // ======================================================================= |
97 | bool 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 | // ======================================================================= |
135 | void 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 | // ======================================================================= |
146 | void 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 | } |