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121 lines
4.3 KiB
C++
121 lines
4.3 KiB
C++
// Created by: Kirill GAVRILOV
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// Copyright (c) 2013-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef _OpenGl_TextureBufferArb_H__
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#define _OpenGl_TextureBufferArb_H__
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#include <OpenGl_VertexBuffer.hxx>
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#include <OpenGl_ArbTBO.hxx>
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//! Texture Buffer Object.
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//! This is a special 1D texture that VBO-style initialized.
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//! The main differences from general 1D texture:
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//! - no interpolation between field;
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//! - greater sizes;
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//! - special sampler object in GLSL shader to access data by index.
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//!
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//! Notice that though TBO is inherited from VBO this is to unify design
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//! user shouldn't cast it to base class and all really useful methods
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//! are declared in this class.
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class OpenGl_TextureBufferArb : public OpenGl_VertexBuffer
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{
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public:
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//! Helpful constants
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static const GLuint NO_TEXTURE = 0;
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public:
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//! Create uninitialized TBO.
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Standard_EXPORT OpenGl_TextureBufferArb();
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//! Destroy object, will throw exception if GPU memory not released with Release() before.
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Standard_EXPORT virtual ~OpenGl_TextureBufferArb();
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//! Override VBO target
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Standard_EXPORT virtual GLenum GetTarget() const Standard_OVERRIDE;
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//! Returns true if TBO is valid.
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//! Notice that no any real GL call is performed!
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bool IsValid() const
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{
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return OpenGl_VertexBuffer::IsValid()
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&& myTextureId != NO_TEXTURE;
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}
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//! Destroy object - will release GPU memory if any.
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Standard_EXPORT virtual void Release (OpenGl_Context* theGlCtx) Standard_OVERRIDE;
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//! Creates VBO and Texture names (ids) if not yet generated.
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//! Data should be initialized by another method.
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Standard_EXPORT bool Create (const Handle(OpenGl_Context)& theGlCtx) Standard_OVERRIDE;
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//! Perform TBO initialization with specified data.
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//! Existing data will be deleted.
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Standard_EXPORT bool Init (const Handle(OpenGl_Context)& theGlCtx,
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const GLuint theComponentsNb,
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const GLsizei theElemsNb,
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const GLfloat* theData);
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//! Perform TBO initialization with specified data.
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//! Existing data will be deleted.
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Standard_EXPORT bool Init (const Handle(OpenGl_Context)& theGlCtx,
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const GLuint theComponentsNb,
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const GLsizei theElemsNb,
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const GLuint* theData);
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//! Perform TBO initialization with specified data.
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//! Existing data will be deleted.
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Standard_EXPORT bool Init (const Handle(OpenGl_Context)& theGlCtx,
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const GLuint theComponentsNb,
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const GLsizei theElemsNb,
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const GLushort* theData);
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//! Perform TBO initialization with specified data.
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//! Existing data will be deleted.
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Standard_EXPORT bool Init (const Handle(OpenGl_Context)& theGlCtx,
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const GLuint theComponentsNb,
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const GLsizei theElemsNb,
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const GLubyte* theData);
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//! Bind TBO to specified Texture Unit.
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Standard_EXPORT void BindTexture (const Handle(OpenGl_Context)& theGlCtx,
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const Graphic3d_TextureUnit theTextureUnit) const;
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//! Unbind TBO.
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Standard_EXPORT void UnbindTexture (const Handle(OpenGl_Context)& theGlCtx,
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const Graphic3d_TextureUnit theTextureUnit) const;
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//! Returns name of TBO.
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GLuint TextureId() const
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{
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return myTextureId;
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}
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protected:
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GLuint myTextureId; //!< texture id
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GLenum myTexFormat; //!< internal texture format
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public:
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DEFINE_STANDARD_RTTIEXT(OpenGl_TextureBufferArb,OpenGl_VertexBuffer) // Type definition
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};
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DEFINE_STANDARD_HANDLE(OpenGl_TextureBufferArb, OpenGl_VertexBuffer)
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#endif // _OpenGl_TextureBufferArb_H__
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