HYDRA-1286 : Support displacement on GeomSubset wireframe highlights (#242)

Author: debloip-adsk

lib/flowViewport/fvpUtils.cpp

@@ -16,8 +16,11 @@
 #include "fvpUtils.h"
 
 #include <pxr/imaging/hd/instanceIndicesSchema.h>
+#include <pxr/imaging/hd/materialBindingsSchema.h>
 #include <pxr/imaging/hd/selectionSchema.h>
 
+PXR_NAMESPACE_USING_DIRECTIVE
+
 namespace FVP_NS_DEF {
 
 #ifdef CODE_COVERAGE_WORKAROUND
@@ -56,4 +59,53 @@ PXR_NS::HdDataSourceBaseHandle createSelectionDataSource(const Fvp::PrimSelectio
     return PXR_NS::HdDataSourceBase::Cast(selectionBuilder.Build());
 }
 
+Fvp::PrimSelection ConvertHydraToFvpSelection(const SdfPath& primPath, const HdSelectionSchema& selectionSchema) {
+    Fvp::PrimSelection primSelection;
+    primSelection.primPath = primPath;
+
+    auto nestedInstanceIndicesSchema = 
+#if HD_API_VERSION < 66
+    const_cast<HdSelectionSchema&>(selectionSchema).GetNestedInstanceIndices();
+#else
+    selectionSchema.GetNestedInstanceIndices();
+#endif
+    for (size_t iNestedInstanceIndices = 0; iNestedInstanceIndices < nestedInstanceIndicesSchema.GetNumElements(); iNestedInstanceIndices++) {
+        HdInstanceIndicesSchema instanceIndicesSchema = nestedInstanceIndicesSchema.GetElement(iNestedInstanceIndices);
+        auto instanceIndices = instanceIndicesSchema.GetInstanceIndices()->GetTypedValue(0);
+        primSelection.nestedInstanceIndices.push_back(
+            {
+                instanceIndicesSchema.GetInstancer()->GetTypedValue(0),
+                instanceIndicesSchema.GetPrototypeIndex()->GetTypedValue(0),
+                std::vector<int>(instanceIndices.begin(), instanceIndices.end())
+            }
+        );
+    }
+
+    return primSelection;
+}
+
+SdfPath GetMaterialPath(const PXR_NS::HdContainerDataSourceHandle& primDataSource)
+{
+    if (!primDataSource) {
+        return {};
+    }
+
+    HdMaterialBindingsSchema materialBindingsSchema = HdMaterialBindingsSchema::GetFromParent(primDataSource);
+    if (!materialBindingsSchema.IsDefined()) {
+        return {};
+    }
+
+    HdMaterialBindingSchema materialBindingSchema = materialBindingsSchema.GetMaterialBinding();
+    if (!materialBindingSchema) {
+        return {};
+    }
+
+    HdPathDataSourceHandle bindingPathDataSource = materialBindingSchema.GetPath();
+    if (!bindingPathDataSource) {
+        return {};
+    }
+
+    return bindingPathDataSource->GetTypedValue(0);
+}
+
 } // namespace FVP_NS_DEF

lib/flowViewport/fvpUtils.h

@@ -24,6 +24,7 @@
 
 #include <pxr/imaging/hd/tokens.h>
 #include <pxr/imaging/hd/retainedDataSource.h>
+#include <pxr/imaging/hd/selectionSchema.h>
 #include <pxr/imaging/hd/primvarsSchema.h>
 
 namespace FVP_NS_DEF {
@@ -125,6 +126,12 @@ auto FindSelfOrFirstChild(const PXR_NS::SdfPath& path, const std::map<PXR_NS::Sd
     return pathMap.cend();
 }
 
+// Return a Fvp::PrimSelection equivalent to the given Hydra selection
+Fvp::PrimSelection ConvertHydraToFvpSelection(const PXR_NS::SdfPath& primPath, const PXR_NS::HdSelectionSchema& selectionSchema);
+
+// Get the path to the prim's bound material.
+PXR_NS::SdfPath GetMaterialPath(const PXR_NS::HdContainerDataSourceHandle& primDataSource);
+
 } // namespace FVP_NS_DEF
 
 #endif // FVP_UTILS_H