1 // Created by: Kirill GAVRILOV
2 // Copyright (c) 2013-2014 OPEN CASCADE SAS
4 // This file is part of Open CASCADE Technology software library.
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
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.
12 // Alternatively, this file may be used under the terms of Open CASCADE
13 // commercial license or contractual agreement.
15 #ifndef _OpenGl_TextureBufferArb_H__
16 #define _OpenGl_TextureBufferArb_H__
18 #include <OpenGl_VertexBuffer.hxx>
19 #include <OpenGl_ArbTBO.hxx>
21 //! Texture Buffer Object.
22 //! This is a special 1D texture that VBO-style initialized.
23 //! The main differences from general 1D texture:
24 //! - no interpolation between field;
26 //! - special sampler object in GLSL shader to access data by index.
28 //! Notice that though TBO is inherited from VBO this is to unify design
29 //! user shouldn't cast it to base class and all really useful methods
30 //! are declared in this class.
31 class OpenGl_TextureBufferArb : public OpenGl_VertexBuffer
37 static const GLuint NO_TEXTURE = 0;
41 //! Create uninitialized TBO.
42 Standard_EXPORT OpenGl_TextureBufferArb();
44 //! Destroy object, will throw exception if GPU memory not released with Release() before.
45 Standard_EXPORT virtual ~OpenGl_TextureBufferArb();
47 //! Override VBO target
48 Standard_EXPORT virtual GLenum GetTarget() const;
50 //! Returns true if TBO is valid.
51 //! Notice that no any real GL call is performed!
54 return OpenGl_VertexBuffer::IsValid()
55 && myTextureId != NO_TEXTURE;
58 //! Destroy object - will release GPU memory if any.
59 Standard_EXPORT virtual void Release (OpenGl_Context* theGlCtx);
61 //! Creates VBO and Texture names (ids) if not yet generated.
62 //! Data should be initialized by another method.
63 Standard_EXPORT bool Create (const Handle(OpenGl_Context)& theGlCtx);
65 //! Perform TBO initialization with specified data.
66 //! Existing data will be deleted.
67 Standard_EXPORT bool Init (const Handle(OpenGl_Context)& theGlCtx,
68 const GLuint theComponentsNb,
69 const GLsizei theElemsNb,
70 const GLfloat* theData);
72 //! Perform TBO initialization with specified data.
73 //! Existing data will be deleted.
74 Standard_EXPORT bool Init (const Handle(OpenGl_Context)& theGlCtx,
75 const GLuint theComponentsNb,
76 const GLsizei theElemsNb,
77 const GLuint* theData);
79 //! Bind TBO to specified Texture Unit.
80 Standard_EXPORT void BindTexture (const Handle(OpenGl_Context)& theGlCtx,
81 const GLenum theTextureUnit = GL_TEXTURE0) const;
84 Standard_EXPORT void UnbindTexture (const Handle(OpenGl_Context)& theGlCtx,
85 const GLenum theTextureUnit = GL_TEXTURE0) const;
89 GLuint myTextureId; //!< texture id
90 GLenum myTexFormat; //!< internal texture format
94 DEFINE_STANDARD_RTTI(OpenGl_TextureBufferArb, OpenGl_VertexBuffer) // Type definition
98 DEFINE_STANDARD_HANDLE(OpenGl_TextureBufferArb, OpenGl_VertexBuffer)
100 #endif // _OpenGl_TextureBufferArb_H__