kicad/include/gal/opengl/cached_container.h

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright 2013-2017 CERN
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* Copyright (C) 2020 KiCad Developers, see AUTHORS.txt for contributors.
*
* @author Maciej Suminski <maciej.suminski@cern.ch>
*
* 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
*/
#ifndef CACHED_CONTAINER_H_
#define CACHED_CONTAINER_H_
#include <gal/opengl/vertex_container.h>
#include <map>
#include <set>
namespace KIGFX
{
class VERTEX_ITEM;
class SHADER;
/**
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* Class to store VERTEX instances with caching.
*
* It associates VERTEX objects and with VERTEX_ITEMs. Caching vertices data in the memory and a
* enables fast reuse of that data.
*/
class CACHED_CONTAINER : public VERTEX_CONTAINER
{
public:
CACHED_CONTAINER( unsigned int aSize = DEFAULT_SIZE );
virtual ~CACHED_CONTAINER() {}
bool IsCached() const override
{
return true;
}
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///> @copydoc VERTEX_CONTAINER::SetItem()
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virtual void SetItem( VERTEX_ITEM* aItem ) override;
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///> @copydoc VERTEX_CONTAINER::FinishItem()
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virtual void FinishItem() override;
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///> @copydoc VERTEX_CONTAINER::Allocate()
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virtual VERTEX* Allocate( unsigned int aSize ) override;
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///> @copydoc VERTEX_CONTAINER::Delete()
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virtual void Delete( VERTEX_ITEM* aItem ) override;
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///> @copydoc VERTEX_CONTAINER::Clear()
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virtual void Clear() override;
/**
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* Return handle to the vertex buffer. It might be negative if the buffer is not initialized.
*/
virtual unsigned int GetBufferHandle() const = 0;
/**
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* Return true if vertex buffer is currently mapped.
*/
virtual bool IsMapped() const = 0;
///> @copydoc VERTEX_CONTAINER::Map()
virtual void Map() override = 0;
///> @copydoc VERTEX_CONTAINER::Unmap()
virtual void Unmap() override = 0;
protected:
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///> Maps size of free memory chunks to their offsets
typedef std::pair<unsigned int, unsigned int> CHUNK;
typedef std::multimap<unsigned int, unsigned int> FREE_CHUNK_MAP;
/// List of all the stored items
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typedef std::set<VERTEX_ITEM*> ITEMS;
/**
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* Resize the chunk that stores the current item to the given size. The current item has
* its offset adjusted after the call, and the new chunk parameters are stored
* in m_chunkOffset and m_chunkSize.
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*
* @param aSize is the requested chunk size.
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* @return true in case of success, false otherwise.
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*/
bool reallocate( unsigned int aSize );
/**
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* Remove empty spaces between chunks and optionally resizes the container.
*
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* After the operation there is continuous space for storing vertices at the end of the
* container.
*
* @param aNewSize is the new size of container, expressed in number of vertices.
* @return false in case of failure (e.g. memory shortage).
*/
virtual bool defragmentResize( unsigned int aNewSize ) = 0;
/**
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* Transfer all stored data to a new buffer, removing empty spaces between the data chunks
* in the container.
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*
* @param aTarget is the destination for the defragmented data.
*/
void defragment( VERTEX* aTarget );
/**
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* Look for consecutive free memory chunks and merges them, decreasing fragmentation of
* memory.
*/
void mergeFreeChunks();
/**
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* Return the size of a chunk.
*
* @param aChunk is the chunk.
*/
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inline int getChunkSize( const CHUNK& aChunk ) const
{
return aChunk.first;
}
/**
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* Return the offset of a chunk.
*
* @param aChunk is the chunk.
*/
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inline unsigned int getChunkOffset( const CHUNK& aChunk ) const
{
return aChunk.second;
}
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/**
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* Add a chunk marked as a free space.
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*/
void addFreeChunk( unsigned int aOffset, unsigned int aSize );
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///> Store size & offset of free chunks.
FREE_CHUNK_MAP m_freeChunks;
///> Stored VERTEX_ITEMs
ITEMS m_items;
///> Currently modified item
VERTEX_ITEM* m_item;
///> Properties of currently modified chunk & item
unsigned int m_chunkSize;
unsigned int m_chunkOffset;
///> Maximal vertex index number stored in the container
unsigned int m_maxIndex;
private:
/// Debug & test functions
void showFreeChunks();
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void showUsedChunks();
void test();
};
} // namespace KIGFX
#endif /* CACHED_CONTAINER_H_ */