e82d6beca1
Chunks of voxel data are stored in a map, and it is quite common to need to search the map for a particular chunk. The key type used to be a Vector3D (i.e. the position of the chunk in 3D space) which makes conceptual sense but is relatively slow. Using a Vector3D as a key seems to have overhead, probably in terms of copying and performing comparisons. It seems to be significantly faster to use an integer as a key, so we now take the 3D position and pack it into a single integer by bitshifting. Naturally this reduces the range of positions we can store - a 32-bit int can only encode 3 x 10-bit values, which means our volume can only be 1024 chunks in each direction (with a chunk often being 32x32x32 voxels). This should still be large enough for most uses, but an upcoming change will allow 64-bit keys to be used (at least on 64-bit builds) which then allows 21 bits of precision per component. This is so large that it's almost infinite for any practical purposes.
70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
/*******************************************************************************
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Copyright (c) 2010 Matt Williams
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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*******************************************************************************/
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#ifndef __PolyVox_TestVolume_H__
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#define __PolyVox_TestVolume_H__
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#include "PolyVox/PolyVoxForwardDeclarations.h"
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#include "PolyVox/Region.h"
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#include <QObject>
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class TestVolume: public QObject
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{
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Q_OBJECT
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public:
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TestVolume();
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~TestVolume();
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private slots:
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/*void testRawVolumeDirectAccessAllInternalForwards();
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void testRawVolumeSamplersAllInternalForwards();
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void testRawVolumeDirectAccessWithExternalForwards();
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void testRawVolumeSamplersWithExternalForwards();
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void testRawVolumeDirectAccessAllInternalBackwards();
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void testRawVolumeSamplersAllInternalBackwards();
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void testRawVolumeDirectAccessWithExternalBackwards();
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void testRawVolumeSamplersWithExternalBackwards();*/
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void testPagedVolumeDirectAccessAllInternalForwards();
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void testPagedVolumeSamplersAllInternalForwards();
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void testPagedVolumeDirectAccessWithExternalForwards();
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void testPagedVolumeSamplersWithExternalForwards();
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void testPagedVolumeDirectAccessAllInternalBackwards();
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void testPagedVolumeSamplersAllInternalBackwards();
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void testPagedVolumeDirectAccessWithExternalBackwards();
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void testPagedVolumeSamplersWithExternalBackwards();
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private:
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PolyVox::Region m_regVolume;
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PolyVox::Region m_regInternal;
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PolyVox::Region m_regExternal;
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PolyVox::FilePager<int32_t>* m_pFilePager;
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PolyVox::RawVolume<int32_t>* m_pRawVolume;
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PolyVox::PagedVolume<int32_t>* m_pPagedVolume;
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};
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#endif
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