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/*
* Copyright (C) 2005-2022 Centre National d'Etudes Spatiales (CNES)
*
* This file is part of Orfeo Toolbox
*
* https://www.orfeo-toolbox.org/
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef otb_GlBufferObject_h
#define otb_GlBufferObject_h
#include "OTBIceExport.h"
#include "otbGlHandle.h"
#include "otbGlTypeTraits.h"
namespace otb { namespace gl {
/** OpenGL element-type of buffer-object.
*/
enum class element : GLenum
{
vertex = GL_ARRAY_BUFFER,
index = GL_ELEMENT_ARRAY_BUFFER,
};
/**
*/
template< element E >
struct BufferObjectPolicy
{
static
void
Generate( Id_t & id )
{
glGenBuffers( 1, &id );
}
static
void
Bind( Id_t id )
{
glBindBuffer( static_cast< GLenum >( E ), id );
}
static
void
Release( Id_t & id )
{
glDeleteBuffers( 1, &id );
}
};
/**
* @class OpenGL object.
*/
template< element E >
struct BufferObject
{
/** Buffer identifier type. */
using Id_t = otb::gl::Id_t;
/** @return element type. */
static constexpr
element
Element() noexcept
{
return E;
}
/** Default constructor. */
BufferObject() = default;
/** Construct and fill. */
template< typename T >
BufferObject( std::initializer_list< T > data,
std::size_t components = 1 ) :
m_Id(),
m_Count( data.size() ),
m_Size( sizeof( T ) ),
m_Components( components ),
m_GlType( TypeTraits< T >::value() )
{
assert( data.size() );
assert( components );
glBufferData(
static_cast< GLenum >( E ),
data.size() * sizeof( T ),
data.begin(),
GL_STATIC_DRAW
);
CheckError();
}
~BufferObject() = default;
BufferObject( BufferObject && ) = default;
BufferObject & operator = ( BufferObject && ) = default;
/** Cast operator. */
operator Id_t() const noexcept
{
return m_Id;
}
void
Bind( bool isEnabled = true ) const
{
m_Id.Bind( isEnabled );
}
GLenum
GlType() const noexcept
{
return m_GlType;
}
std::size_t
Size() const noexcept
{
return m_Size;
}
std::size_t
Stride( std::size_t components ) const noexcept
{
assert( m_Size>0 );
assert( m_Components>0 );
assert( components<=m_Components );
return m_Size * ( m_Components - components );
}
private:
Handle< BufferObjectPolicy< E > > m_Id;
std::size_t m_Count = 0;
std::size_t m_Size = 0;
std::size_t m_Components = 0;
GLenum m_GlType = GL_ZERO;
};
using VertexBufferObject = BufferObject< element::vertex >;
using IndexBufferObject = BufferObject< element::index >;
} // end namespace gl.
} // end namespace otb.
#endif // otb_GlBufferObject_h
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