121 lines
3.8 KiB
C++
121 lines
3.8 KiB
C++
#pragma region License
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/*******************************************************************************
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Copyright (c) 2005-2009 David 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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#pragma endregion
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#ifndef __PolyVox_SurfaceExtractor_H__
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#define __PolyVox_SurfaceExtractor_H__
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#pragma region Headers
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#include "PolyVoxForwardDeclarations.h"
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#include "VolumeSampler.h"
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#include "PolyVoxImpl/TypeDef.h"
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#include "PolyVoxImpl/CPlusPlusZeroXSupport.h"
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#pragma endregion
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namespace PolyVox
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{
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class POLYVOXCORE_API SurfaceExtractor
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{
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public:
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SurfaceExtractor(Volume<uint8_t>& volData);
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POLYVOX_SHARED_PTR<SurfaceMesh> extractSurfaceForRegion(Region region);
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private:
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//Extract the surface for a particular LOD level
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void extractSurfaceImpl(void);
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//Compute the cell bitmask for a particular slice in z.
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template<bool isPrevZAvail>
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uint32_t computeBitmaskForSlice(void);
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//Compute the cell bitmask for a given cell.
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template<bool isPrevXAvail, bool isPrevYAvail, bool isPrevZAvail>
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void computeBitmaskForCell(void);
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//Use the cell bitmasks to generate all the vertices needed for that slice
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void generateVerticesForSlice();
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//Use the cell bitmasks to generate all the indices needed for that slice
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void generateIndicesForSlice();
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//Converts a position into an index for accessing scratch areas.
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inline uint32_t getIndex(uint32_t x, uint32_t y)
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{
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return x + (y * m_uScratchPadWidth);
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}
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//The volume data and a sampler to access it.
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Volume<uint8_t> m_volData;
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VolumeSampler<uint8_t> m_sampVolume;
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//Cell bitmasks for the current and previous slices.
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uint8_t* m_pPreviousBitmask;
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uint8_t* m_pCurrentBitmask;
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//Used to keep track of where generated vertices have been placed.
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int32_t* m_pPreviousVertexIndicesX;
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int32_t* m_pPreviousVertexIndicesY;
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int32_t* m_pPreviousVertexIndicesZ;
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int32_t* m_pCurrentVertexIndicesX;
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int32_t* m_pCurrentVertexIndicesY;
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int32_t* m_pCurrentVertexIndicesZ;
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//Holds a position in volume space.
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uint16_t uXVolSpace;
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uint16_t uYVolSpace;
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uint16_t uZVolSpace;
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//Holds a position in region space.
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uint16_t uXRegSpace;
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uint16_t uYRegSpace;
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uint16_t uZRegSpace;
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//Used to return the number of cells in a slice which contain triangles.
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uint32_t m_uNoOfOccupiedCells;
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//The surface patch we are currently filling.
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SurfaceMesh* m_meshCurrent;
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//Information about the region we are currently processing
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Region m_regInputCropped;
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Region m_regInputUncropped;
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Region m_regVolumeCropped;
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Region m_regSlicePrevious;
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Region m_regSliceCurrent;
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//Store the width and height because they are frequently
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//used and have some overhead to compute.
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uint16_t m_uRegionWidth;
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uint16_t m_uRegionHeight;
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//These are used in several places so best stored.
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uint16_t m_uScratchPadWidth;
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uint16_t m_uScratchPadHeight;
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};
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}
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#endif
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