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+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2022, 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 post processing step to join identical vertices
+ * for all imported meshes
+ */
+
+
+#ifndef ASSIMP_BUILD_NO_JOINVERTICES_PROCESS
+
+#include "JoinVerticesProcess.h"
+#include "ProcessHelper.h"
+#include <assimp/Vertex.h>
+#include <assimp/TinyFormatter.h>
+#include <stdio.h>
+#include <unordered_set>
+
+using namespace Assimp;
+// ------------------------------------------------------------------------------------------------
+// Constructor to be privately used by Importer
+JoinVerticesProcess::JoinVerticesProcess()
+{
+ // nothing to do here
+}
+
+// ------------------------------------------------------------------------------------------------
+// Destructor, private as well
+JoinVerticesProcess::~JoinVerticesProcess()
+{
+ // nothing to do here
+}
+
+// ------------------------------------------------------------------------------------------------
+// Returns whether the processing step is present in the given flag field.
+bool JoinVerticesProcess::IsActive( unsigned int pFlags) const
+{
+ return (pFlags & aiProcess_JoinIdenticalVertices) != 0;
+}
+// ------------------------------------------------------------------------------------------------
+// Executes the post processing step on the given imported data.
+void JoinVerticesProcess::Execute( aiScene* pScene)
+{
+ ASSIMP_LOG_DEBUG("JoinVerticesProcess begin");
+
+ // get the total number of vertices BEFORE the step is executed
+ int iNumOldVertices = 0;
+ if (!DefaultLogger::isNullLogger()) {
+ for( unsigned int a = 0; a < pScene->mNumMeshes; a++) {
+ iNumOldVertices += pScene->mMeshes[a]->mNumVertices;
+ }
+ }
+
+ // execute the step
+ int iNumVertices = 0;
+ for( unsigned int a = 0; a < pScene->mNumMeshes; a++)
+ iNumVertices += ProcessMesh( pScene->mMeshes[a],a);
+
+ // if logging is active, print detailed statistics
+ if (!DefaultLogger::isNullLogger()) {
+ if (iNumOldVertices == iNumVertices) {
+ ASSIMP_LOG_DEBUG("JoinVerticesProcess finished ");
+ } else {
+ ASSIMP_LOG_INFO("JoinVerticesProcess finished | Verts in: ", iNumOldVertices,
+ " out: ", iNumVertices, " | ~",
+ ((iNumOldVertices - iNumVertices) / (float)iNumOldVertices) * 100.f );
+ }
+ }
+
+ pScene->mFlags |= AI_SCENE_FLAGS_NON_VERBOSE_FORMAT;
+}
+
+namespace {
+
+bool areVerticesEqual(const Vertex &lhs, const Vertex &rhs, bool complex)
+{
+ // A little helper to find locally close vertices faster.
+ // Try to reuse the lookup table from the last step.
+ const static float epsilon = 1e-5f;
+ // Squared because we check against squared length of the vector difference
+ static const float squareEpsilon = epsilon * epsilon;
+
+ // Square compare is useful for animeshes vertices compare
+ if ((lhs.position - rhs.position).SquareLength() > squareEpsilon) {
+ return false;
+ }
+
+ // We just test the other attributes even if they're not present in the mesh.
+ // In this case they're initialized to 0 so the comparison succeeds.
+ // By this method the non-present attributes are effectively ignored in the comparison.
+ if ((lhs.normal - rhs.normal).SquareLength() > squareEpsilon) {
+ return false;
+ }
+
+ if ((lhs.texcoords[0] - rhs.texcoords[0]).SquareLength() > squareEpsilon) {
+ return false;
+ }
+
+ if ((lhs.tangent - rhs.tangent).SquareLength() > squareEpsilon) {
+ return false;
+ }
+
+ if ((lhs.bitangent - rhs.bitangent).SquareLength() > squareEpsilon) {
+ return false;
+ }
+
+ // Usually we won't have vertex colors or multiple UVs, so we can skip from here
+ // Actually this increases runtime performance slightly, at least if branch
+ // prediction is on our side.
+ if (complex) {
+ for (int i = 0; i < 8; i++) {
+ if (i > 0 && (lhs.texcoords[i] - rhs.texcoords[i]).SquareLength() > squareEpsilon) {
+ return false;
+ }
+ if (GetColorDifference(lhs.colors[i], rhs.colors[i]) > squareEpsilon) {
+ return false;
+ }
+ }
+ }
+ return true;
+}
+
+template<class XMesh>
+void updateXMeshVertices(XMesh *pMesh, std::vector<Vertex> &uniqueVertices) {
+ // replace vertex data with the unique data sets
+ pMesh->mNumVertices = (unsigned int)uniqueVertices.size();
+
+ // ----------------------------------------------------------------------------
+ // NOTE - we're *not* calling Vertex::SortBack() because it would check for
+ // presence of every single vertex component once PER VERTEX. And our CPU
+ // dislikes branches, even if they're easily predictable.
+ // ----------------------------------------------------------------------------
+
+ // Position, if present (check made for aiAnimMesh)
+ if (pMesh->mVertices)
+ {
+ delete [] pMesh->mVertices;
+ pMesh->mVertices = new aiVector3D[pMesh->mNumVertices];
+ for (unsigned int a = 0; a < pMesh->mNumVertices; a++) {
+ pMesh->mVertices[a] = uniqueVertices[a].position;
+ }
+ }
+
+ // Normals, if present
+ if (pMesh->mNormals)
+ {
+ delete [] pMesh->mNormals;
+ pMesh->mNormals = new aiVector3D[pMesh->mNumVertices];
+ for( unsigned int a = 0; a < pMesh->mNumVertices; a++) {
+ pMesh->mNormals[a] = uniqueVertices[a].normal;
+ }
+ }
+ // Tangents, if present
+ if (pMesh->mTangents)
+ {
+ delete [] pMesh->mTangents;
+ pMesh->mTangents = new aiVector3D[pMesh->mNumVertices];
+ for (unsigned int a = 0; a < pMesh->mNumVertices; a++) {
+ pMesh->mTangents[a] = uniqueVertices[a].tangent;
+ }
+ }
+ // Bitangents as well
+ if (pMesh->mBitangents)
+ {
+ delete [] pMesh->mBitangents;
+ pMesh->mBitangents = new aiVector3D[pMesh->mNumVertices];
+ for (unsigned int a = 0; a < pMesh->mNumVertices; a++) {
+ pMesh->mBitangents[a] = uniqueVertices[a].bitangent;
+ }
+ }
+ // Vertex colors
+ for (unsigned int a = 0; pMesh->HasVertexColors(a); a++)
+ {
+ delete [] pMesh->mColors[a];
+ pMesh->mColors[a] = new aiColor4D[pMesh->mNumVertices];
+ for( unsigned int b = 0; b < pMesh->mNumVertices; b++) {
+ pMesh->mColors[a][b] = uniqueVertices[b].colors[a];
+ }
+ }
+ // Texture coords
+ for (unsigned int a = 0; pMesh->HasTextureCoords(a); a++)
+ {
+ delete [] pMesh->mTextureCoords[a];
+ pMesh->mTextureCoords[a] = new aiVector3D[pMesh->mNumVertices];
+ for (unsigned int b = 0; b < pMesh->mNumVertices; b++) {
+ pMesh->mTextureCoords[a][b] = uniqueVertices[b].texcoords[a];
+ }
+ }
+}
+} // namespace
+
+// ------------------------------------------------------------------------------------------------
+// Unites identical vertices in the given mesh
+int JoinVerticesProcess::ProcessMesh( aiMesh* pMesh, unsigned int meshIndex)
+{
+ static_assert( AI_MAX_NUMBER_OF_COLOR_SETS == 8, "AI_MAX_NUMBER_OF_COLOR_SETS == 8");
+ static_assert( AI_MAX_NUMBER_OF_TEXTURECOORDS == 8, "AI_MAX_NUMBER_OF_TEXTURECOORDS == 8");
+
+ // Return early if we don't have any positions
+ if (!pMesh->HasPositions() || !pMesh->HasFaces()) {
+ return 0;
+ }
+
+ // We should care only about used vertices, not all of them
+ // (this can happen due to original file vertices buffer being used by
+ // multiple meshes)
+ std::unordered_set<unsigned int> usedVertexIndices;
+ usedVertexIndices.reserve(pMesh->mNumVertices);
+ for( unsigned int a = 0; a < pMesh->mNumFaces; a++)
+ {
+ aiFace& face = pMesh->mFaces[a];
+ for( unsigned int b = 0; b < face.mNumIndices; b++) {
+ usedVertexIndices.insert(face.mIndices[b]);
+ }
+ }
+
+ // We'll never have more vertices afterwards.
+ std::vector<Vertex> uniqueVertices;
+ uniqueVertices.reserve( pMesh->mNumVertices);
+
+ // For each vertex the index of the vertex it was replaced by.
+ // Since the maximal number of vertices is 2^31-1, the most significand bit can be used to mark
+ // whether a new vertex was created for the index (true) or if it was replaced by an existing
+ // unique vertex (false). This saves an additional std::vector<bool> and greatly enhances
+ // branching performance.
+ static_assert(AI_MAX_VERTICES == 0x7fffffff, "AI_MAX_VERTICES == 0x7fffffff");
+ std::vector<unsigned int> replaceIndex( pMesh->mNumVertices, 0xffffffff);
+
+ // float posEpsilonSqr;
+ SpatialSort *vertexFinder = nullptr;
+ SpatialSort _vertexFinder;
+
+ typedef std::pair<SpatialSort,float> SpatPair;
+ if (shared) {
+ std::vector<SpatPair >* avf;
+ shared->GetProperty(AI_SPP_SPATIAL_SORT,avf);
+ if (avf) {
+ SpatPair& blubb = (*avf)[meshIndex];
+ vertexFinder = &blubb.first;
+ // posEpsilonSqr = blubb.second;
+ }
+ }
+ if (!vertexFinder) {
+ // bad, need to compute it.
+ _vertexFinder.Fill(pMesh->mVertices, pMesh->mNumVertices, sizeof( aiVector3D));
+ vertexFinder = &_vertexFinder;
+ // posEpsilonSqr = ComputePositionEpsilon(pMesh);
+ }
+
+ // Again, better waste some bytes than a realloc ...
+ std::vector<unsigned int> verticesFound;
+ verticesFound.reserve(10);
+
+ // Run an optimized code path if we don't have multiple UVs or vertex colors.
+ // This should yield false in more than 99% of all imports ...
+ const bool complex = ( pMesh->GetNumColorChannels() > 0 || pMesh->GetNumUVChannels() > 1);
+ const bool hasAnimMeshes = pMesh->mNumAnimMeshes > 0;
+
+ // We'll never have more vertices afterwards.
+ std::vector<std::vector<Vertex>> uniqueAnimatedVertices;
+ if (hasAnimMeshes) {
+ uniqueAnimatedVertices.resize(pMesh->mNumAnimMeshes);
+ for (unsigned int animMeshIndex = 0; animMeshIndex < pMesh->mNumAnimMeshes; animMeshIndex++) {
+ uniqueAnimatedVertices[animMeshIndex].reserve(pMesh->mNumVertices);
+ }
+ }
+
+ // Now check each vertex if it brings something new to the table
+ for( unsigned int a = 0; a < pMesh->mNumVertices; a++) {
+ if (usedVertexIndices.find(a) == usedVertexIndices.end()) {
+ continue;
+ }
+
+ // collect the vertex data
+ Vertex v(pMesh,a);
+
+ // collect all vertices that are close enough to the given position
+ vertexFinder->FindIdenticalPositions( v.position, verticesFound);
+ unsigned int matchIndex = 0xffffffff;
+
+ // check all unique vertices close to the position if this vertex is already present among them
+ for( unsigned int b = 0; b < verticesFound.size(); b++) {
+ const unsigned int vidx = verticesFound[b];
+ const unsigned int uidx = replaceIndex[ vidx];
+ if( uidx & 0x80000000)
+ continue;
+
+ const Vertex& uv = uniqueVertices[ uidx];
+
+ if (!areVerticesEqual(v, uv, complex)) {
+ continue;
+ }
+
+ if (hasAnimMeshes) {
+ // If given vertex is animated, then it has to be preserver 1 to 1 (base mesh and animated mesh require same topology)
+ // NOTE: not doing this totaly breaks anim meshes as they don't have their own faces (they use pMesh->mFaces)
+ bool breaksAnimMesh = false;
+ for (unsigned int animMeshIndex = 0; animMeshIndex < pMesh->mNumAnimMeshes; animMeshIndex++) {
+ const Vertex& animatedUV = uniqueAnimatedVertices[animMeshIndex][ uidx];
+ Vertex aniMeshVertex(pMesh->mAnimMeshes[animMeshIndex], a);
+ if (!areVerticesEqual(aniMeshVertex, animatedUV, complex)) {
+ breaksAnimMesh = true;
+ break;
+ }
+ }
+ if (breaksAnimMesh) {
+ continue;
+ }
+ }
+
+ // we're still here -> this vertex perfectly matches our given vertex
+ matchIndex = uidx;
+ break;
+ }
+
+ // found a replacement vertex among the uniques?
+ if( matchIndex != 0xffffffff)
+ {
+ // store where to found the matching unique vertex
+ replaceIndex[a] = matchIndex | 0x80000000;
+ }
+ else
+ {
+ // no unique vertex matches it up to now -> so add it
+ replaceIndex[a] = (unsigned int)uniqueVertices.size();
+ uniqueVertices.push_back( v);
+ if (hasAnimMeshes) {
+ for (unsigned int animMeshIndex = 0; animMeshIndex < pMesh->mNumAnimMeshes; animMeshIndex++) {
+ Vertex aniMeshVertex(pMesh->mAnimMeshes[animMeshIndex], a);
+ uniqueAnimatedVertices[animMeshIndex].push_back(aniMeshVertex);
+ }
+ }
+ }
+ }
+
+ if (!DefaultLogger::isNullLogger() && DefaultLogger::get()->getLogSeverity() == Logger::VERBOSE) {
+ ASSIMP_LOG_VERBOSE_DEBUG(
+ "Mesh ",meshIndex,
+ " (",
+ (pMesh->mName.length ? pMesh->mName.data : "unnamed"),
+ ") | Verts in: ",pMesh->mNumVertices,
+ " out: ",
+ uniqueVertices.size(),
+ " | ~",
+ ((pMesh->mNumVertices - uniqueVertices.size()) / (float)pMesh->mNumVertices) * 100.f,
+ "%"
+ );
+ }
+
+ updateXMeshVertices(pMesh, uniqueVertices);
+ if (hasAnimMeshes) {
+ for (unsigned int animMeshIndex = 0; animMeshIndex < pMesh->mNumAnimMeshes; animMeshIndex++) {
+ updateXMeshVertices(pMesh->mAnimMeshes[animMeshIndex], uniqueAnimatedVertices[animMeshIndex]);
+ }
+ }
+
+ // adjust the indices in all faces
+ for( unsigned int a = 0; a < pMesh->mNumFaces; a++)
+ {
+ aiFace& face = pMesh->mFaces[a];
+ for( unsigned int b = 0; b < face.mNumIndices; b++) {
+ face.mIndices[b] = replaceIndex[face.mIndices[b]] & ~0x80000000;
+ }
+ }
+
+ // adjust bone vertex weights.
+ for( int a = 0; a < (int)pMesh->mNumBones; a++) {
+ aiBone* bone = pMesh->mBones[a];
+ std::vector<aiVertexWeight> newWeights;
+ newWeights.reserve( bone->mNumWeights);
+
+ if (nullptr != bone->mWeights) {
+ for ( unsigned int b = 0; b < bone->mNumWeights; b++ ) {
+ const aiVertexWeight& ow = bone->mWeights[ b ];
+ // if the vertex is a unique one, translate it
+ if ( !( replaceIndex[ ow.mVertexId ] & 0x80000000 ) ) {
+ aiVertexWeight nw;
+ nw.mVertexId = replaceIndex[ ow.mVertexId ];
+ nw.mWeight = ow.mWeight;
+ newWeights.push_back( nw );
+ }
+ }
+ } else {
+ ASSIMP_LOG_ERROR( "X-Export: aiBone shall contain weights, but pointer to them is nullptr." );
+ }
+
+ if (newWeights.size() > 0) {
+ // kill the old and replace them with the translated weights
+ delete [] bone->mWeights;
+ bone->mNumWeights = (unsigned int)newWeights.size();
+
+ bone->mWeights = new aiVertexWeight[bone->mNumWeights];
+ memcpy( bone->mWeights, &newWeights[0], bone->mNumWeights * sizeof( aiVertexWeight));
+ }
+ }
+ return pMesh->mNumVertices;
+}
+
+#endif // !! ASSIMP_BUILD_NO_JOINVERTICES_PROCESS
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