lightAdapter.h

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//
// Copyright 2017 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_LIGHT_ADAPTER_H
#define PXR_USD_IMAGING_USD_IMAGING_LIGHT_ADAPTER_H

/// \file usdImaging/lightAdapter.h

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

PXR_NAMESPACE_OPEN_SCOPE


class UsdPrim;

/// \class UsdImagingLightAdapter
///
/// Base class for all lights.
///
class UsdImagingLightAdapter : public UsdImagingPrimAdapter {
public:
    typedef UsdImagingPrimAdapter BaseAdapter;

    USDIMAGING_API
    static bool IsEnabledSceneLights();

    UsdImagingLightAdapter()
        : UsdImagingPrimAdapter()
    {}

    USDIMAGING_API
    ~UsdImagingLightAdapter() override;

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

    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 = NULL) 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 = NULL) const override;


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

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

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

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

    USDIMAGING_API
    virtual void MarkCollectionsDirty(UsdPrim const& prim,
                                      SdfPath const& cachePath,
                                      UsdImagingIndexProxy* index) override;

    // ---------------------------------------------------------------------- //
    /// \name Utilities 
    // ---------------------------------------------------------------------- //

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

    // Helper function: map USD path to UsdImaging cache path,
    // applying any name-encoding required by the instancerContext.
    USDIMAGING_API
    static SdfPath
    _ResolveCachePath(
        const SdfPath& usdPath,
        const UsdImagingInstancerContext* instancerContext);

    // Helper function: add a given type of sprim, potentially with instancer
    // name mangling
    USDIMAGING_API
    SdfPath
    _AddSprim(
        const TfToken& primType,
        const UsdPrim& usdPrim,
        UsdImagingIndexProxy* index,
        const UsdImagingInstancerContext* instancerContext = nullptr);

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

    // To be called from the Light Populate method
    void _UnregisterLightCollections(SdfPath const& cachePath);

    // To be called from the Light _RemovePrim method
    void _RegisterLightCollections(UsdPrim const& prim);

private:
    /// Updates the collection cache content
    /// Checks for collection hash change and returns true if they are different
    bool _UpdateCollectionsChanged(UsdPrim const& prim) const;


};


PXR_NAMESPACE_CLOSE_SCOPE

#endif // PXR_USD_IMAGING_USD_IMAGING_LIGHT_ADAPTER_H