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Optimized usedVertexIndices by using bitmask instead of unordered_set

pull/4901/head
AdamCichocki 2023-01-23 14:51:02 +01:00
parent cff81568f3
commit 72b178b9fc
1 changed files with 7 additions and 6 deletions
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13
code/PostProcessing/JoinVerticesProcess.cpp
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@ -264,12 +264,13 @@ int JoinVerticesProcess::ProcessMesh( aiMesh* pMesh, unsigned int meshIndex) {
// 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++) {
std::vector<unsigned int> usedVertexIndicesMask;
usedVertexIndicesMask.resize((pMesh->mNumVertices + 31) / 32, 0);
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]);
for (unsigned int b = 0; b < face.mNumIndices; b++) {
const unsigned int currIndex = face.mIndices[b];
usedVertexIndicesMask[currIndex / 32] |= 1u << (currIndex % 32);
}
}
@ -335,7 +336,7 @@ int JoinVerticesProcess::ProcessMesh( aiMesh* pMesh, unsigned int meshIndex) {
int newIndex = 0;
for( unsigned int a = 0; a < pMesh->mNumVertices; a++) {
// if the vertex is unused Do nothing
if (usedVertexIndices.find(a) == usedVertexIndices.end()) {
if (0 == (usedVertexIndicesMask[a / 32] & (1u << (a % 32)))) {
continue;
}
// collect the vertex data