135 lines
4.9 KiB
C++
135 lines
4.9 KiB
C++
/*
|
|
---------------------------------------------------------------------------
|
|
Open Asset Import Library (assimp)
|
|
---------------------------------------------------------------------------
|
|
|
|
Copyright (c) 2006-2018, assimp team
|
|
|
|
|
|
|
|
All rights reserved.
|
|
|
|
Redistribution and use of this software in source and binary forms,
|
|
with or without modification, are permitted provided that the following
|
|
conditions are met:
|
|
|
|
* Redistributions of source code must retain the above
|
|
copyright notice, this list of conditions and the
|
|
following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above
|
|
copyright notice, this list of conditions and the
|
|
following disclaimer in the documentation and/or other
|
|
materials provided with the distribution.
|
|
|
|
* Neither the name of the assimp team, nor the names of its
|
|
contributors may be used to endorse or promote products
|
|
derived from this software without specific prior
|
|
written permission of the assimp team.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
---------------------------------------------------------------------------
|
|
*/
|
|
|
|
/** @file Implementation of the VertexTriangleAdjacency helper class
|
|
*/
|
|
|
|
// internal headers
|
|
#include "VertexTriangleAdjacency.h"
|
|
#include <assimp/mesh.h>
|
|
|
|
using namespace Assimp;
|
|
|
|
// ------------------------------------------------------------------------------------------------
|
|
VertexTriangleAdjacency::VertexTriangleAdjacency(aiFace *pcFaces,
|
|
unsigned int iNumFaces,
|
|
unsigned int iNumVertices /*= 0*/,
|
|
bool bComputeNumTriangles /*= false*/)
|
|
{
|
|
// compute the number of referenced vertices if it wasn't specified by the caller
|
|
const aiFace* const pcFaceEnd = pcFaces + iNumFaces;
|
|
if (!iNumVertices) {
|
|
for (aiFace* pcFace = pcFaces; pcFace != pcFaceEnd; ++pcFace) {
|
|
ai_assert( nullptr != pcFace );
|
|
ai_assert(3 == pcFace->mNumIndices);
|
|
iNumVertices = std::max(iNumVertices,pcFace->mIndices[0]);
|
|
iNumVertices = std::max(iNumVertices,pcFace->mIndices[1]);
|
|
iNumVertices = std::max(iNumVertices,pcFace->mIndices[2]);
|
|
}
|
|
}
|
|
|
|
mNumVertices = iNumVertices;
|
|
|
|
unsigned int* pi;
|
|
|
|
// allocate storage
|
|
if (bComputeNumTriangles) {
|
|
pi = mLiveTriangles = new unsigned int[iNumVertices+1];
|
|
::memset(mLiveTriangles,0,sizeof(unsigned int)*(iNumVertices+1));
|
|
mOffsetTable = new unsigned int[iNumVertices+2]+1;
|
|
} else {
|
|
pi = mOffsetTable = new unsigned int[iNumVertices+2]+1;
|
|
::memset(mOffsetTable,0,sizeof(unsigned int)*(iNumVertices+1));
|
|
mLiveTriangles = NULL; // important, otherwise the d'tor would crash
|
|
}
|
|
|
|
// get a pointer to the end of the buffer
|
|
unsigned int* piEnd = pi+iNumVertices;
|
|
*piEnd++ = 0u;
|
|
|
|
// first pass: compute the number of faces referencing each vertex
|
|
for (aiFace* pcFace = pcFaces; pcFace != pcFaceEnd; ++pcFace) {
|
|
pi[pcFace->mIndices[0]]++;
|
|
pi[pcFace->mIndices[1]]++;
|
|
pi[pcFace->mIndices[2]]++;
|
|
}
|
|
|
|
// second pass: compute the final offset table
|
|
unsigned int iSum = 0;
|
|
unsigned int* piCurOut = this->mOffsetTable;
|
|
for (unsigned int* piCur = pi; piCur != piEnd;++piCur,++piCurOut) {
|
|
|
|
unsigned int iLastSum = iSum;
|
|
iSum += *piCur;
|
|
*piCurOut = iLastSum;
|
|
}
|
|
pi = this->mOffsetTable;
|
|
|
|
// third pass: compute the final table
|
|
this->mAdjacencyTable = new unsigned int[iSum];
|
|
iSum = 0;
|
|
for (aiFace* pcFace = pcFaces; pcFace != pcFaceEnd; ++pcFace,++iSum) {
|
|
|
|
unsigned int idx = pcFace->mIndices[0];
|
|
mAdjacencyTable[pi[idx]++] = iSum;
|
|
|
|
idx = pcFace->mIndices[1];
|
|
mAdjacencyTable[pi[idx]++] = iSum;
|
|
|
|
idx = pcFace->mIndices[2];
|
|
mAdjacencyTable[pi[idx]++] = iSum;
|
|
}
|
|
// fourth pass: undo the offset computations made during the third pass
|
|
// We could do this in a separate buffer, but this would be TIMES slower.
|
|
--mOffsetTable;
|
|
*mOffsetTable = 0u;
|
|
}
|
|
// ------------------------------------------------------------------------------------------------
|
|
VertexTriangleAdjacency::~VertexTriangleAdjacency()
|
|
{
|
|
// delete allocated storage
|
|
delete[] mOffsetTable;
|
|
delete[] mAdjacencyTable;
|
|
delete[] mLiveTriangles;
|
|
}
|