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/*
* Copyright (C) 2005-2020 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_GlHandle_h
#define otb_GlHandle_h
#include "OTBIceExport.h"
#ifdef _WIN32
# include <windows.h>
#endif
#include <GL/glew.h>
#include "otbGlError.h"
#include <cassert>
#include <utility>
namespace otb { namespace gl {
using Id_t = GLuint;
/**
* @class OpenGL handle.
*/
template< typename Policy >
class OTBIce_EXPORT Handle
{
using Policy_t = Policy;
public:
/** OpenGL handle identifier type */
using Id_t = otb::gl::Id_t;
/** Default constructor */
Handle()
{
Policy::Generate( m_Id );
assert( m_Id );
CheckError();
Policy::Bind( m_Id );
CheckError();
}
/** Destructor */
~Handle()
{
Release();
}
/** Copy constructor (disabled). */
Handle( Handle const & ) = delete;
/** Assignement operator (disabled). */
Handle & operator = ( Handle const & ) = delete;
/** Move constructor. */
Handle( Handle && rhs ) noexcept :
m_Id( std::exchange( rhs.m_Id, 0 ) ) {}
/** Move assignment operator. */
Handle &
operator = ( Handle && rhs )
{
Release();
m_Id = std::exchange( rhs.m_Id, GL_ZERO );
return *this;
}
/** Cast operator. */
operator Id_t() const noexcept
{
return m_Id;
}
/** OpenGL handle binding */
void
Bind( bool isEnabled = true ) const
{
assert( m_Id );
Policy::Bind( isEnabled ? m_Id : GL_ZERO );
CheckError();
}
protected:
/** OpenGL handle identifier (handler) */
Id_t m_Id = GL_ZERO;
private:
void
Release()
{
CheckError< error::clear >();
Policy::Release( m_Id );
m_Id = GL_ZERO;
CheckError();
}
};
} // end namespace gl.
} // end namespace otb.
#endif // otb_GlHandle_h
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