142 lines
5.0 KiB
C++
142 lines
5.0 KiB
C++
/*
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Open Asset Import Library (ASSIMP)
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----------------------------------------------------------------------
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Copyright (c) 2006-2008, ASSIMP Development Team
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All rights reserved.
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Redistribution and use of this software in source and binary forms,
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with or without modification, are permitted provided that the
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following conditions are met:
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* Redistributions of source code must retain the above
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copyright notice, this list of conditions and the
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following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the
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following disclaimer in the documentation and/or other
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materials provided with the distribution.
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* Neither the name of the ASSIMP team, nor the names of its
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contributors may be used to endorse or promote products
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derived from this software without specific prior
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written permission of the ASSIMP Development Team.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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----------------------------------------------------------------------
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*/
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#ifndef AI_PROCESS_HELPER_H_INCLUDED
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#define AI_PROCESS_HELPER_H_INCLUDED
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#include "../include/aiPostProcess.h"
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#include "SpatialSort.h"
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#include "BaseProcess.h"
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namespace Assimp {
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typedef std::pair< unsigned int,float > PerVertexWeight;
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typedef std::vector< PerVertexWeight > VertexWeightTable;
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// ------------------------------------------------------------------------------------------------
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// compute a good epsilon value for position comparisons
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inline float ComputePositionEpsilon(const aiMesh* pMesh)
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{
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const float epsilon = 1e-5f;
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// calculate the position bounds so we have a reliable epsilon to check position differences against
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aiVector3D minVec( 1e10f, 1e10f, 1e10f), maxVec( -1e10f, -1e10f, -1e10f);
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for( unsigned int a = 0; a < pMesh->mNumVertices; a++)
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{
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minVec.x = std::min( minVec.x, pMesh->mVertices[a].x);
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minVec.y = std::min( minVec.y, pMesh->mVertices[a].y);
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minVec.z = std::min( minVec.z, pMesh->mVertices[a].z);
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maxVec.x = std::max( maxVec.x, pMesh->mVertices[a].x);
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maxVec.y = std::max( maxVec.y, pMesh->mVertices[a].y);
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maxVec.z = std::max( maxVec.z, pMesh->mVertices[a].z);
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}
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return (maxVec - minVec).Length() * epsilon;
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}
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// ------------------------------------------------------------------------------------------------
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// Compute a per-vertex bone weight table
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// NOTE: delete result with operator delete[] ...
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inline VertexWeightTable* ComputeVertexBoneWeightTable(aiMesh* pMesh)
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{
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if (!pMesh || !pMesh->mNumVertices || !pMesh->mNumBones) return NULL;
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VertexWeightTable* avPerVertexWeights = new VertexWeightTable[pMesh->mNumVertices];
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for (unsigned int i = 0; i < pMesh->mNumBones;++i)
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{
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aiBone* bone = pMesh->mBones[i];
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for (unsigned int a = 0; a < bone->mNumWeights;++a)
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{
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aiVertexWeight& weight = bone->mWeights[a];
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avPerVertexWeights[weight.mVertexId].push_back(
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std::pair<unsigned int,float>(i,weight.mWeight));
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}
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}
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return avPerVertexWeights;
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}
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// ------------------------------------------------------------------------------------------------
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class ComputeSpatialSortProcess : public BaseProcess
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{
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bool IsActive( unsigned int pFlags) const
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{
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return NULL != shared && 0 != (pFlags & (aiProcess_CalcTangentSpace |
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aiProcess_GenNormals | aiProcess_JoinIdenticalVertices));
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}
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void Execute( aiScene* pScene)
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{
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typedef std::pair<SpatialSort, float> _Type;
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std::vector<_Type>* p = new std::vector<_Type>(pScene->mNumMeshes);
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std::vector<_Type>::iterator it = p->begin();
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for (unsigned int i = 0; i < pScene->mNumMeshes; ++i, ++it)
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{
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aiMesh* mesh = pScene->mMeshes[i];
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_Type& blubb = *it;
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blubb.first.Fill(mesh->mVertices,mesh->mNumVertices,sizeof(aiVector3D));
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blubb.second = ComputePositionEpsilon(mesh);
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}
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shared->AddProperty(AI_SPP_SPATIAL_SORT,p);
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}
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};
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// ------------------------------------------------------------------------------------------------
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class DestroySpatialSortProcess : public BaseProcess
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{
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bool IsActive( unsigned int pFlags) const
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{
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return NULL != shared && 0 != (pFlags & (aiProcess_CalcTangentSpace |
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aiProcess_GenNormals | aiProcess_JoinIdenticalVertices));
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}
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void Execute( aiScene* pScene)
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{
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shared->RemoveProperty(AI_SPP_SPATIAL_SORT);
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}
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};
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} // !! Assimp
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#endif // !! AI_PROCESS_HELPER_H_INCLUDED
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