117 lines
4.7 KiB
C
117 lines
4.7 KiB
C
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/****************************************************************************
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* VCGLib o o *
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* Visual and Computer Graphics Library o o *
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* _ O _ *
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* Copyright(C) 2004 \/)\/ *
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* Visual Computing Lab /\/| *
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* ISTI - Italian National Research Council | *
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* \ *
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* All rights reserved. *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (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 (http://www.gnu.org/licenses/gpl.txt) *
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* for more details. *
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* *
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****************************************************************************/
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#ifndef __MEMORY_INFO_H
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#define __MEMORY_INFO_H
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#include <stdexcept>
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namespace vcg
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{
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//WARNING: All the classes derived from MemoryInfo has been intended to be instantiated as a singleton in the host application
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//(i.e. in every application using it just an instance of a class derived from MemoryInfo should be declared).
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class MemoryInfo
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{
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public:
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class MemoryInfoException : public std::exception
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{
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public:
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MemoryInfoException(const char* text)
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:std::exception(),_exctext(text){}
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~MemoryInfoException() throw() {}
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inline const char* what() const throw() {return _exctext;}
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private:
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const char* _exctext;
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};
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MemoryInfo(long long unsigned int originalmem)
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:_originaltotalmemory(originalmem),_currentfreememory(_originaltotalmemory)
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{
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}
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virtual ~MemoryInfo() {}
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virtual void acquiredMemory(long long unsigned int mem) = 0;
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virtual long long unsigned int usedMemory() const = 0;
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virtual long long unsigned int currentFreeMemory() const = 0;
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virtual void releasedMemory(long long unsigned int mem = 0) = 0;
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virtual bool isAdditionalMemoryAvailable(long long unsigned int mem) = 0;
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protected:
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const long long unsigned int _originaltotalmemory;
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long long unsigned int _currentfreememory;
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};
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//WARNING: this is not a thread safe class. The object derived from MemoryInfo are intended to be used inside GLMeshAttributeFeeder as static variable in order to manage the available GPUMemory.
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//We strongly recommend you to define in your code a thread safe version of the class, defining mutexed access member functions.
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//This class should be consider just as a basic example for the implementations of the required functionalities.
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//It is safe to use it just when the user has only one mesh to pass to the GPU.
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class NotThreadSafeMemoryInfo : public MemoryInfo
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{
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public:
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NotThreadSafeMemoryInfo(long long unsigned int originalmem)
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:MemoryInfo(originalmem)
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{
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}
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~NotThreadSafeMemoryInfo() {}
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void acquiredMemory(long long unsigned int mem)
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{
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if (mem > _originaltotalmemory)
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throw MemoryInfo::MemoryInfoException("It has been requested more memory than the total one.\\n");
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else
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if (mem > _currentfreememory)
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throw MemoryInfo::MemoryInfoException("It has been requested more memory than the free available one.\\n");
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else
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_currentfreememory -= mem;
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}
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long long unsigned int usedMemory() const
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{
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return _originaltotalmemory - _currentfreememory;
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}
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long long unsigned int currentFreeMemory() const
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{
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return _currentfreememory;
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}
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void releasedMemory(long long unsigned int mem = 0)
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{
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if (mem > _originaltotalmemory)
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throw MemoryInfo::MemoryInfoException("It has been released more memory than the total one. Something strange happened!\\n");
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else
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_currentfreememory += mem;
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}
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bool isAdditionalMemoryAvailable(long long unsigned int mem)
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{
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return (_currentfreememory >= mem);
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}
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};
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};
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#endif
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