Update UsdImagingCoordSysAPIAdapter

- Adds coordSys:<instanceName> coordSys hydra prim
    - This provides info for coordSys hydra prim, which can be queried for:
        - name (instanceName of the corresponding applied UsdShadeCoordSysAPI)
        - xform values
    - Updated stageSceneIndexContext test usda and baseline

Following updates were done for the above:
- Implemented GetImagingSubprims and GetImagingSubprimType methods for UsdImagingCoordSysAPIAdapter
- Implement UsdImagingDataSourceCoordsysPrim which is a data source representing the subprim and is responsible for providing coordSys prim's name and xform.
- Adds a new HdCoordSysSchema which also provides "name" member field and its builder interface(s).

(Internal change: 2263106)

pxr/imaging/hd/CMakeLists.txt

@@ -43,6 +43,7 @@ pxr_library(hd
         coneSchema
         containerDataSourceEditor
         coordSys
+        coordSysSchema
         coordSysBindingSchema
         cubeSchema
         cylinderSchema

pxr/imaging/hd/coordSysBindingSchema.h

@@ -78,4 +78,4 @@ class HdCoordSysBindingSchema : public HdSchema
 
 PXR_NAMESPACE_CLOSE_SCOPE
 
-#endif
+#endif

pxr/imaging/hd/coordSysSchema.cpp

@@ -0,0 +1,107 @@
+//
+// Copyright 2022 Pixar
+//
+// Licensed under the Apache License, Version 2.0 (the "Apache License")
+// with the following modification; you may not use this file except in
+// compliance with the Apache License and the following modification to it:
+// Section 6. Trademarks. is deleted and replaced with:
+//
+// 6. Trademarks. This License does not grant permission to use the trade
+//    names, trademarks, service marks, or product names of the Licensor
+//    and its affiliates, except as required to comply with Section 4(c) of
+//    the License and to reproduce the content of the NOTICE file.
+//
+// You may obtain a copy of the Apache License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the Apache License with the above modification is
+// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the Apache License for the specific
+// language governing permissions and limitations under the Apache License.
+//
+////////////////////////////////////////////////////////////////////////
+
+/* ************************************************************************** */
+/* ** This file is generated by a script.  Do not edit directly.  Edit     ** */
+/* ** defs.py or the (*)Schema.template.cpp files to make changes.         ** */
+/* ************************************************************************** */
+
+#include "pxr/imaging/hd/coordSysSchema.h"
+#include "pxr/imaging/hd/retainedDataSource.h"
+
+#include "pxr/base/trace/trace.h"
+
+
+PXR_NAMESPACE_OPEN_SCOPE
+
+TF_DEFINE_PUBLIC_TOKENS(HdCoordSysSchemaTokens,
+    HDCOORDSYS_SCHEMA_TOKENS);
+
+
+
+HdTokenDataSourceHandle
+HdCoordSysSchema::GetName()
+{
+    return _GetTypedDataSource<HdTokenDataSource>(
+        HdCoordSysSchemaTokens->name);
+}
+
+/*static*/
+HdContainerDataSourceHandle
+HdCoordSysSchema::BuildRetained(
+        const HdTokenDataSourceHandle &name
+)
+{
+    TfToken names[1];
+    HdDataSourceBaseHandle values[1];
+
+    size_t count = 0;
+    if (name) {
+        names[count] = HdCoordSysSchemaTokens->name;
+        values[count++] = name;
+    }
+
+    return HdRetainedContainerDataSource::New(count, names, values);
+}
+
+/*static*/
+HdCoordSysSchema
+HdCoordSysSchema::GetFromParent(
+        const HdContainerDataSourceHandle &fromParentContainer)
+{
+    return HdCoordSysSchema(
+        fromParentContainer
+        ? HdContainerDataSource::Cast(fromParentContainer->Get(
+                HdCoordSysSchemaTokens->coordSys))
+        : nullptr);
+}
+
+/*static*/
+const HdDataSourceLocator &
+HdCoordSysSchema::GetDefaultLocator()
+{
+    static const HdDataSourceLocator locator(
+        HdCoordSysSchemaTokens->coordSys
+    );
+    return locator;
+} 
+HdCoordSysSchema::Builder &
+HdCoordSysSchema::Builder::SetName(
+    const HdTokenDataSourceHandle &name)
+{
+    _name = name;
+    return *this;
+}
+
+HdContainerDataSourceHandle
+HdCoordSysSchema::Builder::Build()
+{
+    return HdCoordSysSchema::BuildRetained(
+        _name
+    );
+}
+
+
+PXR_NAMESPACE_CLOSE_SCOPE

pxr/imaging/hd/coordSysSchema.h

@@ -0,0 +1,114 @@
+//
+// Copyright 2022 Pixar
+//
+// Licensed under the Apache License, Version 2.0 (the "Apache License")
+// with the following modification; you may not use this file except in
+// compliance with the Apache License and the following modification to it:
+// Section 6. Trademarks. is deleted and replaced with:
+//
+// 6. Trademarks. This License does not grant permission to use the trade
+//    names, trademarks, service marks, or product names of the Licensor
+//    and its affiliates, except as required to comply with Section 4(c) of
+//    the License and to reproduce the content of the NOTICE file.
+//
+// You may obtain a copy of the Apache License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the Apache License with the above modification is
+// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied. See the Apache License for the specific
+// language governing permissions and limitations under the Apache License.
+//
+////////////////////////////////////////////////////////////////////////
+
+/* ************************************************************************** */
+/* ** This file is generated by a script.  Do not edit directly.  Edit     ** */
+/* ** defs.py or the (*)Schema.template.h files to make changes.           ** */
+/* ************************************************************************** */
+
+#ifndef PXR_IMAGING_HD_COORD_SYS_SCHEMA_H
+#define PXR_IMAGING_HD_COORD_SYS_SCHEMA_H
+
+#include "pxr/imaging/hd/api.h"
+
+#include "pxr/imaging/hd/schema.h" 
+
+PXR_NAMESPACE_OPEN_SCOPE
+
+//-----------------------------------------------------------------------------
+
+#define HDCOORDSYS_SCHEMA_TOKENS \
+    (coordSys) \
+    (name) \
+
+TF_DECLARE_PUBLIC_TOKENS(HdCoordSysSchemaTokens, HD_API,
+    HDCOORDSYS_SCHEMA_TOKENS);
+
+//-----------------------------------------------------------------------------
+
+class HdCoordSysSchema : public HdSchema
+{
+public:
+    HdCoordSysSchema(HdContainerDataSourceHandle container)
+    : HdSchema(container) {}
+
+    //ACCESSORS
+
+    HD_API
+    HdTokenDataSourceHandle GetName();
+
+    // RETRIEVING AND CONSTRUCTING
+
+    /// Builds a container data source which includes the provided child data
+    /// sources. Parameters with nullptr values are excluded. This is a
+    /// low-level interface. For cases in which it's desired to define
+    /// the container with a sparse set of child fields, the Builder class
+    /// is often more convenient and readable.
+    HD_API
+    static HdContainerDataSourceHandle
+    BuildRetained(
+        const HdTokenDataSourceHandle &name
+    );
+
+    /// \class HdCoordSysSchema::Builder
+    /// 
+    /// Utility class for setting sparse sets of child data source fields to be
+    /// filled as arguments into BuildRetained. Because all setter methods
+    /// return a reference to the instance, this can be used in the "builder
+    /// pattern" form.
+    class Builder
+    {
+    public:
+        HD_API
+        Builder &SetName(
+            const HdTokenDataSourceHandle &name);
+
+        /// Returns a container data source containing the members set thus far.
+        HD_API
+        HdContainerDataSourceHandle Build();
+
+    private:
+        HdTokenDataSourceHandle _name;
+    };
+
+    /// Retrieves a container data source with the schema's default name token
+    /// "coordSys" from the parent container and constructs a
+    /// HdCoordSysSchema instance.
+    /// Because the requested container data source may not exist, the result
+    /// should be checked with IsDefined() or a bool comparison before use.
+    HD_API
+    static HdCoordSysSchema GetFromParent(
+        const HdContainerDataSourceHandle &fromParentContainer);
+
+    /// Returns an HdDataSourceLocator (relative to the prim-level data source)
+    /// where the container representing this schema is found by default.
+    HD_API
+    static const HdDataSourceLocator &GetDefaultLocator();
+
+};
+
+PXR_NAMESPACE_CLOSE_SCOPE
+
+#endif