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