HdTopology::ID
HdBasisCurvesTopology::ComputeHash() const
{
HD_TRACE_FUNCTION();
HdTopology::ID hash = 0;
hash = ArchHash64((const char*)&_curveBasis, sizeof(TfToken), hash);
hash = ArchHash64((const char*)&_curveType, sizeof(TfToken), hash);
hash = ArchHash64((const char*)&_curveWrap, sizeof(TfToken), hash);
hash = ArchHash64((const char*)_curveVertexCounts.cdata(),
_curveVertexCounts.size() * sizeof(int), hash);
hash = ArchHash64((const char*)_curveIndices.cdata(),
_curveIndices.size() * sizeof(int), hash);
return hash;
}
HdTopology::ID
HdMeshTopology::ComputeHash() const
{
HD_TRACE_FUNCTION();
HdTopology::ID hash =_topology.ComputeHash();
hash = ArchHash64((const char*)&_refineLevel, sizeof(_refineLevel), hash);
return hash;
}
//
// De-duplicating and sharing of ExtComputation data.
//
// This is similar to sharing of primvar data. We identify
// data by computing a hash of the sources of the data. For
// now, buffer data allocated here is read-only and is never
// mutated. If that changes, then we will have to deal with
// migrating shared data to a non-shared buffer so that it
// can be modified safely.
//
static uint64_t
_ComputeSharedComputationInputId(uint64_t baseId,
HdBufferSourceVector const &sources)
{
size_t inputId = baseId;
for (HdBufferSourceSharedPtr const &bufferSource : sources) {
size_t sourceId = bufferSource->ComputeHash();
inputId = ArchHash64((const char*)&sourceId,
sizeof(sourceId), inputId);
}
return inputId;
}
