hermiteCurvesAdapter.h

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//
// Copyright 2020 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_USD_IMAGING_USD_IMAGING_HERMITE_CURVES_ADAPTER_H
#define PXR_USD_IMAGING_USD_IMAGING_HERMITE_CURVES_ADAPTER_H

/// \file usdImaging/hermiteCurvesAdapter.h

#include "pxr/pxr.h"
#include "pxr/usdImaging/usdImaging/api.h"
#include "pxr/usdImaging/usdImaging/primAdapter.h"
#include "pxr/usdImaging/usdImaging/gprimAdapter.h"

PXR_NAMESPACE_OPEN_SCOPE


/// \class UsdImagingHermiteCurvesAdapter
///
/// Delegate support for UsdGeomHermiteCurves.
///
/// As Hydra doesn't support imaging of Hermite curves, we render
/// the points as linearly interpolated BasisCurves, ignoring tangents,
/// widths, and normals.
///
class UsdImagingHermiteCurvesAdapter : public UsdImagingGprimAdapter {
public:
    typedef UsdImagingGprimAdapter BaseAdapter;

    UsdImagingHermiteCurvesAdapter()
        : UsdImagingGprimAdapter()
    {}
    USDIMAGING_API
    virtual ~UsdImagingHermiteCurvesAdapter();

    USDIMAGING_API
    SdfPath Populate(
        UsdPrim const& prim,
        UsdImagingIndexProxy* index,
        UsdImagingInstancerContext const* instancerContext = nullptr) override;

    USDIMAGING_API
    bool IsSupported(UsdImagingIndexProxy const* index) const override;

    // ---------------------------------------------------------------------- //
    /// \name Parallel Setup and Resolve
    // ---------------------------------------------------------------------- //

    /// Thread Safe.
    USDIMAGING_API
    void TrackVariability(
        UsdPrim const& prim,
        SdfPath const& cachePath,
        HdDirtyBits* timeVaryingBits,
        UsdImagingInstancerContext const* instancerContext = nullptr) 
            const override;

    // ---------------------------------------------------------------------- //
    /// \name Change Processing
    // ---------------------------------------------------------------------- //

    USDIMAGING_API
    HdDirtyBits ProcessPropertyChange(UsdPrim const& prim,
                                      SdfPath const& cachePath,
                                      TfToken const& propertyName) override;

    // ---------------------------------------------------------------------- //
    /// \name Data access
    // ---------------------------------------------------------------------- //

    USDIMAGING_API
    VtValue GetTopology(UsdPrim const& prim,
                        SdfPath const& cachePath,
                        UsdTimeCode time) const override;

protected:
    USDIMAGING_API
    bool _IsBuiltinPrimvar(TfToken const& primvarName) const override;
};


PXR_NAMESPACE_CLOSE_SCOPE

#endif // PXR_USD_IMAGING_USD_IMAGING_HERMITE_CURVES_ADAPTER_H