renderVarAdapter.h

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//
// Copyright 2023 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_USD_IMAGING_USD_IMAGING_RENDER_VAR_ADAPTER_H
#define PXR_USD_IMAGING_USD_IMAGING_RENDER_VAR_ADAPTER_H

/// \file usdImaging/renderVarAdapter.h

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

PXR_NAMESPACE_OPEN_SCOPE


/// \class UsdImagingRenderVarAdapter
///
/// Adapter support for UsdRenderVar for *only* the scene index (2.0) API.
///
/// \note For the legacy (UsdImagingDelegate and associated prim adapter API)
///       scenario, UsdImagingRenderSettingsAdapter handles the flattening of
///       products and vars. 
///
class UsdImagingRenderVarAdapter : public UsdImagingPrimAdapter {
public:
    using BaseAdapter = UsdImagingPrimAdapter;

    UsdImagingRenderVarAdapter()
        : UsdImagingPrimAdapter()
    {}

    USDIMAGING_API
    ~UsdImagingRenderVarAdapter() override;

    // ---------------------------------------------------------------------- //
    /// \name Scene Index Support
    // ---------------------------------------------------------------------- //

    USDIMAGING_API
    TfTokenVector GetImagingSubprims(UsdPrim const& prim) override;

    USDIMAGING_API
    TfToken GetImagingSubprimType(
            UsdPrim const& prim,
            TfToken const& subprim) override;

    USDIMAGING_API
    HdContainerDataSourceHandle GetImagingSubprimData(
            UsdPrim const& prim,
            TfToken const& subprim,
            const UsdImagingDataSourceStageGlobals &stageGlobals) override;

    USDIMAGING_API
    HdDataSourceLocatorSet InvalidateImagingSubprim(
            UsdPrim const& prim,
            TfToken const& subprim,
            TfTokenVector const& properties,
            UsdImagingPropertyInvalidationType invalidationType) override;

    // ---------------------------------------------------------------------- //
    /// \name Initialization
    // ---------------------------------------------------------------------- //

    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;


    /// Thread Safe.
    USDIMAGING_API
    void UpdateForTime(UsdPrim const& prim,
                       SdfPath const& cachePath,
                       UsdTimeCode time,
                       HdDirtyBits requestedBits,
                       UsdImagingInstancerContext const* 
                       instancerContext = nullptr) const override;

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

    /// Returns a bit mask of attributes to be udpated, or
    /// HdChangeTracker::AllDirty if the entire prim must be resynchronized.
    USDIMAGING_API
    HdDirtyBits ProcessPropertyChange(UsdPrim const& prim,
                                      SdfPath const& cachePath,
                                      TfToken const& propertyName) override;

    USDIMAGING_API
    void MarkDirty(UsdPrim const& prim,
                   SdfPath const& cachePath,
                   HdDirtyBits dirty,
                   UsdImagingIndexProxy* index) override;

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

    USDIMAGING_API
    VtValue Get(UsdPrim const& prim,
                SdfPath const& cachePath,
                TfToken const& key,
                UsdTimeCode time,
                VtIntArray *outIndices) const override;

protected:
    USDIMAGING_API
    void _RemovePrim(SdfPath const& cachePath,
                     UsdImagingIndexProxy* index) override;

};


PXR_NAMESPACE_CLOSE_SCOPE

#endif // PXR_USD_IMAGING_USD_IMAGING_RENDER_VAR_ADAPTER_H