dataSourcePrimvars.h

//
// 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.
//
#ifndef PXR_USD_IMAGING_USD_IMAGING_DATA_SOURCE_PRIMVARS_H
#define PXR_USD_IMAGING_USD_IMAGING_DATA_SOURCE_PRIMVARS_H

#include "pxr/usdImaging/usdImaging/dataSourceAttribute.h"
#include "pxr/usdImaging/usdImaging/dataSourceStageGlobals.h"

#include "pxr/usd/usdGeom/primvar.h"
#include "pxr/usd/usdGeom/primvarsAPI.h"

PXR_NAMESPACE_OPEN_SCOPE

class UsdImagingDataSourcePrimvars : public HdContainerDataSource
{
public:
    HD_DECLARE_DATASOURCE(UsdImagingDataSourcePrimvars);

    bool Has(const TfToken &name) override;
    TfTokenVector GetNames() override;
    HdDataSourceBaseHandle Get(const TfToken &name) override;

    // This map is passed to the constructor to specify non-"primvars:"
    // attributes to include as primvars (e.g., "points" and "normals").
    // The first token is the datasource name, and the second the USD name.
    using CustomPrimvarMapping = std::vector<std::pair<TfToken, TfToken>>;

private:
    UsdImagingDataSourcePrimvars(
            const SdfPath &sceneIndexPath,
            UsdGeomPrimvarsAPI usdPrimvars,
            const CustomPrimvarMapping &customPrimvarMapping,
            const UsdImagingDataSourceStageGlobals &stageGlobals);

private:

    TfToken _GetCustomPrimvarInterpolation(const UsdAttributeQuery &attrQuery);

    // Path of the owning prim.
    SdfPath _sceneIndexPath;

    // Stage globals handle.
    const UsdImagingDataSourceStageGlobals &_stageGlobals;

    // Maps to custom & namespace-enumerated primvars, populated at
    // construction time...
    using _CustomPrimvarsMap = std::map<TfToken, UsdAttributeQuery>;
    _CustomPrimvarsMap _customPrimvars;
    using _NamespacedPrimvarsMap = std::map<TfToken, UsdGeomPrimvar>;
    _NamespacedPrimvarsMap _namespacedPrimvars;
};

HD_DECLARE_DATASOURCE_HANDLES(UsdImagingDataSourcePrimvars);

// ----------------------------------------------------------------------------

class UsdImagingDataSourcePrimvar : public HdContainerDataSource
{
public:
    HD_DECLARE_DATASOURCE(UsdImagingDataSourcePrimvar);

    bool Has(const TfToken & name) override;
    TfTokenVector GetNames() override;
    HdDataSourceBaseHandle Get(const TfToken & name) override;

private:
    UsdImagingDataSourcePrimvar(
            const SdfPath &sceneIndexPath,
            const TfToken &name,
            const UsdImagingDataSourceStageGlobals &stageGlobals,
            UsdAttributeQuery valueQuery,
            UsdAttributeQuery indicesQuery,
            HdTokenDataSourceHandle interpolation,
            HdTokenDataSourceHandle role);

private:
    const UsdImagingDataSourceStageGlobals &_stageGlobals;
    UsdAttributeQuery _valueQuery;
    UsdAttributeQuery _indicesQuery;
    HdTokenDataSourceHandle _interpolation;
    HdTokenDataSourceHandle _role;
};

HD_DECLARE_DATASOURCE_HANDLES(UsdImagingDataSourcePrimvar);

PXR_NAMESPACE_CLOSE_SCOPE

#endif // PXR_USD_IMAGING_USD_IMAGING_DATA_SOURCE_PRIMVARS_H