1 // Created by: Kirill GAVRILOV
2 // Copyright (c) 2012 OPEN CASCADE SAS
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.
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.
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.
19 #ifndef _OpenGl_TextureBufferArb_H__
20 #define _OpenGl_TextureBufferArb_H__
22 #include <OpenGl_VertexBuffer.hxx>
23 #include <OpenGl_ArbTBO.hxx>
25 //! Texture Buffer Object.
26 //! This is a special 1D texture that VBO-style initialized.
27 //! The main differences from general 1D texture:
28 //! - no interpolation between field;
30 //! - special sampler object in GLSL shader to access data by index.
32 //! Notice that though TBO is inherited from VBO this is to unify design
33 //! user shouldn't cast it to base class and all really useful methods
34 //! are declared in this class.
35 class OpenGl_TextureBufferArb : public OpenGl_VertexBuffer
41 static const GLuint NO_TEXTURE = 0;
45 //! Create uninitialized TBO.
46 Standard_EXPORT OpenGl_TextureBufferArb();
48 //! Destroy object, will throw exception if GPU memory not released with Release() before.
49 Standard_EXPORT virtual ~OpenGl_TextureBufferArb();
51 //! Override VBO target
52 Standard_EXPORT virtual GLenum GetTarget() const;
54 //! Returns true if TBO is valid.
55 //! Notice that no any real GL call is performed!
58 return OpenGl_VertexBuffer::IsValid()
59 && myTextureId != NO_TEXTURE;
62 //! Destroy object - will release GPU memory if any.
63 Standard_EXPORT virtual void Release (const OpenGl_Context* theGlCtx);
65 //! Creates VBO and Texture names (ids) if not yet generated.
66 //! Data should be initialized by another method.
67 Standard_EXPORT bool Create (const Handle(OpenGl_Context)& theGlCtx);
69 //! Perform TBO initialization with specified data.
70 //! Existing data will be deleted.
71 Standard_EXPORT bool Init (const Handle(OpenGl_Context)& theGlCtx,
72 const GLuint theComponentsNb,
73 const GLsizei theElemsNb,
74 const GLfloat* theData);
76 //! Bind TBO to specified Texture Unit.
77 Standard_EXPORT void BindTexture (const Handle(OpenGl_Context)& theGlCtx,
78 const GLenum theTextureUnit = GL_TEXTURE0) const;
81 Standard_EXPORT void UnbindTexture (const Handle(OpenGl_Context)& theGlCtx,
82 const GLenum theTextureUnit = GL_TEXTURE0) const;
86 GLuint myTextureId; //!< texture id
87 GLenum myTexFormat; //!< internal texture format
91 DEFINE_STANDARD_RTTI(OpenGl_TextureBufferArb) // Type definition
95 DEFINE_STANDARD_HANDLE(OpenGl_TextureBufferArb, OpenGl_VertexBuffer)
97 #endif // _OpenGl_TextureBufferArb_H__