noncached_container.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013 CERN
 * Copyright (C) 2021 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * @author Maciej Suminski <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#include <gal/opengl/noncached_container.h>
#include <cstring>
#include <cstdlib>
 
using namespace KIGFX;
 
NONCACHED_CONTAINER::NONCACHED_CONTAINER( unsigned int aSize ) :
 VERTEX_CONTAINER( aSize ),
 m_freePtr( 0 )
{
 m_vertices = static_cast<VERTEX*>( malloc( aSize * sizeof( VERTEX ) ) );
 
 // Unfortunately we cannot remove the use of malloc here because realloc is used in
 // the Allocate method below. The new operator behavior is mimicked here so that a
 // malloc failure can be caught in the OpenGL initialization code further up the stack.
 if( !m_vertices )
 throw std::bad_alloc();
 
 memset( m_vertices, 0x00, aSize * sizeof( VERTEX ) );
}
 
 
NONCACHED_CONTAINER::~NONCACHED_CONTAINER()
{
 free( m_vertices );
}
 
 
void NONCACHED_CONTAINER::SetItem( VERTEX_ITEM* aItem )
{
 // Nothing has to be done, as the noncached container
 // does not care about VERTEX_ITEMs ownership
}
 
 
VERTEX* NONCACHED_CONTAINER::Allocate( unsigned int aSize )
{
 if( m_freeSpace < aSize )
 {
 // Double the space
 VERTEX* newVertices =
 static_cast<VERTEX*>( realloc( m_vertices, m_currentSize * 2 * sizeof( VERTEX ) ) );
 
 if( newVertices != nullptr )
 {
 m_vertices = newVertices;
 m_freeSpace += m_currentSize;
 m_currentSize *= 2;
 }
 else
 {
 throw std::bad_alloc();
 }
 }
 
 VERTEX* freeVertex = &m_vertices[m_freePtr];
 
 // Move to the next free chunk
 m_freePtr += aSize;
 m_freeSpace -= aSize;
 
 return freeVertex;
}
 
 
void NONCACHED_CONTAINER::Clear()
{
 m_freePtr = 0;
 m_freeSpace = m_currentSize;
}