void
UsdImagingGprimAdapter::TrackVariabilityPrep(UsdPrim const& prim,
SdfPath const& cachePath,
int requestedBits,
UsdImagingInstancerContext const*
instancerContext)
{
// Prepopulate cache entries to avoid mutation during multi-threaded data
// fetch.
UsdImagingValueCache* valueCache = _GetValueCache();
if (requestedBits & HdChangeTracker::DirtyVisibility) {
valueCache->GetVisible(cachePath);
valueCache->GetPurpose(cachePath);
}
if (requestedBits & HdChangeTracker::DirtyPrimVar) {
valueCache->GetPrimvars(cachePath);
}
}
void
UsdImagingGprimAdapter::TrackVariability(UsdPrim const& prim,
SdfPath const& cachePath,
int requestedBits,
int* dirtyBits,
UsdImagingInstancerContext const*
instancerContext)
{
// WARNING: This method is executed from multiple threads, the value cache
// has been carefully pre-populated to avoid mutating the underlying
// container during update.
// Why is this OK?
// Either the value is unvarying, in which case the time ordinate doesn't
// matter; or the value is varying, in which case we will update it upon
// first call to Delegate::SetTime().
UsdTimeCode time(1.0);
UsdImagingValueCache* valueCache = _GetValueCache();
if (requestedBits & HdChangeTracker::DirtyPrimVar) {
if (not _IsVarying(prim,
UsdGeomTokens->primvarsDisplayColor,
HdChangeTracker::DirtyPrimVar,
UsdImagingTokens->usdVaryingPrimVar,
dirtyBits,
false)) {
// Only do this second check if the displayColor isn't already known
// to be varying.
_IsVarying(prim,
UsdGeomTokens->primvarsDisplayOpacity,
HdChangeTracker::DirtyPrimVar,
UsdImagingTokens->usdVaryingPrimVar,
dirtyBits,
false);
}
}
if (requestedBits & HdChangeTracker::DirtyExtent) {
// Discover time-varying extent.
_IsVarying(prim,
UsdGeomTokens->extent,
HdChangeTracker::DirtyExtent,
UsdImagingTokens->usdVaryingExtent,
dirtyBits,
false);
}
if (requestedBits & HdChangeTracker::DirtyTransform) {
// Discover time-varying transforms.
_IsTransformVarying(prim,
HdChangeTracker::DirtyTransform,
UsdImagingTokens->usdVaryingXform,
dirtyBits);
}
if (requestedBits & HdChangeTracker::DirtyVisibility) {
valueCache->GetVisible(cachePath) = GetVisible(prim, time);
// Discover time-varying visibility.
_IsVarying(prim,
UsdGeomTokens->visibility,
HdChangeTracker::DirtyVisibility,
UsdImagingTokens->usdVaryingVisibility,
dirtyBits,
true);
TfToken purpose = _GetPurpose(prim, time);
// Empty purpose means there is no opinion, fall back to geom.
if (purpose.IsEmpty())
purpose = UsdGeomTokens->default_;
valueCache->GetPurpose(cachePath) = purpose;
}
}