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Coding - Fix draco buffer index out of bounds

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Fixed an exception where the bufferIndex is out of bounds.
Happens when Draco compression is combined with SetMergeFaces.
This commit is contained in:
Elias Cohenca 2025-01-23 02:25:08 +02:00 committed by GitHub
parent 87a64bbad5
commit bb84ecf5c6
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GPG Key ID: B5690EEEBB952194
1 changed files with 41 additions and 45 deletions
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86
src/RWGltf/RWGltf_CafWriter.cxx
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@ -746,27 +746,27 @@ bool RWGltf_CafWriter::writeBinData (const Handle(TDocStd_Document)& theDocument
continue;
}
std::shared_ptr<RWGltf_CafWriter::Mesh> aMeshPtr;
#ifdef HAVE_DRACO
++aMeshIndex;
if (myDracoParameters.DracoCompression)
{
if (aMeshIndex <= aMeshes.size())
{
aMeshPtr = aMeshes.at(aMeshIndex - 1);
}
else
{
aMeshes.push_back(std::make_shared<RWGltf_CafWriter::Mesh>(RWGltf_CafWriter::Mesh()));
aMeshPtr = aMeshes.back();
}
}
#endif
for (RWGltf_GltfFaceList::Iterator aGltfFaceIter (*aGltfFaceList); aGltfFaceIter.More() && aPSentryBin.More(); aGltfFaceIter.Next())
{
const Handle(RWGltf_GltfFace)& aGltfFace = aGltfFaceIter.Value();
std::shared_ptr<RWGltf_CafWriter::Mesh> aMeshPtr;
#ifdef HAVE_DRACO
++aMeshIndex;
if (myDracoParameters.DracoCompression)
{
if (aMeshIndex <= aMeshes.size())
{
aMeshPtr = aMeshes.at(aMeshIndex - 1);
}
else
{
aMeshes.push_back(std::make_shared<RWGltf_CafWriter::Mesh>(RWGltf_CafWriter::Mesh()));
aMeshPtr = aMeshes.back();
}
}
#endif
Handle(RWGltf_GltfFace) anOldGltfFace;
if (aWrittenPrimData.Find (aGltfFace->Shape, anOldGltfFace))
{
@ -1899,23 +1899,21 @@ void RWGltf_CafWriter::writeMeshes (const RWGltf_GltfSceneNodeMap& theSceneNodeM
for (RWGltf_GltfFaceList::Iterator aFaceGroupIter (*aGltfFaceList); aFaceGroupIter.More(); aFaceGroupIter.Next())
{
const Handle(RWGltf_GltfFace)& aGltfFace = aFaceGroupIter.Value();
const int aPrevSize = aDracoBufIndMap.Size();
const int aTempDracoBufInd = aDracoBufInd;
if (myDracoParameters.DracoCompression
&& !aDracoBufIndMap.FindFromKey (aGltfFace->NodePos.Id, aDracoBufInd))
int aCurrentDracoBufInd = 0;
if (myDracoParameters.DracoCompression)
{
aDracoBufIndMap.Add (aGltfFace->NodePos.Id, aDracoBufInd);
// Check if we've seen this NodePos.Id before
if (!aDracoBufIndMap.FindFromKey(aGltfFace->NodePos.Id, aCurrentDracoBufInd))
{
// New Draco buffer entry needed
aCurrentDracoBufInd = aDracoBufInd;
aDracoBufIndMap.Add(aGltfFace->NodePos.Id, aCurrentDracoBufInd);
++aDracoBufInd;
}
}
writePrimArray (*aGltfFace, aNodeName, aDracoBufInd, toStartPrims);
if (aTempDracoBufInd != aDracoBufInd)
{
aDracoBufInd = aTempDracoBufInd;
}
if (!myDracoParameters.DracoCompression || aDracoBufIndMap.Size() > aPrevSize)
{
++aDracoBufInd;
}
writePrimArray(*aGltfFace, aNodeName, aCurrentDracoBufInd, toStartPrims);
}
}
else
@ -1935,23 +1933,21 @@ void RWGltf_CafWriter::writeMeshes (const RWGltf_GltfSceneNodeMap& theSceneNodeM
}
const Handle(RWGltf_GltfFace)& aGltfFace = aGltfFaceList->First();
const int aPrevSize = aDracoBufIndMap.Size();
const int aTempDracoBufInd = aDracoBufInd;
if (myDracoParameters.DracoCompression
&& !aDracoBufIndMap.FindFromKey(aGltfFace->NodePos.Id, aDracoBufInd))
int aCurrentDracoBufInd = 0;
if (myDracoParameters.DracoCompression)
{
aDracoBufIndMap.Add(aGltfFace->NodePos.Id, aDracoBufInd);
// Check if we've seen this NodePos.Id before
if (!aDracoBufIndMap.FindFromKey(aGltfFace->NodePos.Id, aCurrentDracoBufInd))
{
// New Draco buffer entry needed
aCurrentDracoBufInd = aDracoBufInd;
aDracoBufIndMap.Add(aGltfFace->NodePos.Id, aCurrentDracoBufInd);
++aDracoBufInd;
}
}
writePrimArray (*aGltfFace, aNodeName, aDracoBufInd, toStartPrims);
if (aTempDracoBufInd != aDracoBufInd)
{
aDracoBufInd = aTempDracoBufInd;
}
if (!myDracoParameters.DracoCompression || aDracoBufIndMap.Size() > aPrevSize)
{
++aDracoBufInd;
}
writePrimArray(*aGltfFace, aNodeName, aCurrentDracoBufInd, toStartPrims);
}
}