instancer.h

//
// Copyright 2019 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 EXT_RMANPKG_24_0_PLUGIN_RENDERMAN_PLUGIN_HD_PRMAN_INSTANCER_H
#define EXT_RMANPKG_24_0_PLUGIN_RENDERMAN_PLUGIN_HD_PRMAN_INSTANCER_H

#include "pxr/pxr.h"
#include "hdPrman/context.h"
#include "pxr/imaging/hd/instancer.h"
#include "pxr/imaging/hd/sceneDelegate.h"
#include "pxr/imaging/hd/timeSampleArray.h"
#include "pxr/base/tf/hashmap.h"
#include "pxr/base/tf/token.h"
#include "pxr/base/vt/types.h"
#include "pxr/base/vt/value.h"

PXR_NAMESPACE_OPEN_SCOPE

class HdPrmanInstancer : public HdInstancer {
public:
    HdPrmanInstancer(HdSceneDelegate* delegate, SdfPath const& id);

    ~HdPrmanInstancer();

    void SampleInstanceTransforms(
        SdfPath const& prototypeId,
        VtIntArray const& instanceIndices,
        HdTimeSampleArray<VtMatrix4dArray, HDPRMAN_MAX_TIME_SAMPLES> *sa);

    void GetInstancePrimvars(
        SdfPath const& prototypeId,
        size_t instanceIndex,
        RtParamList& attrs);

    void Sync(HdSceneDelegate *sceneDelegate,
              HdRenderParam   *renderParam,
              HdDirtyBits     *dirtyBits) override;

private:

    void _SyncPrimvars(HdSceneDelegate *sceneDelegate,
                       HdDirtyBits dirtyBits);

    // Map of the latest primvar data for this instancer, keyed by primvar name
    struct _PrimvarValue {
        HdPrimvarDescriptor desc;
        VtValue value;
    };
    TfHashMap<TfToken,
              _PrimvarValue,
              TfToken::HashFunctor> _primvarMap;
};


PXR_NAMESPACE_CLOSE_SCOPE

#endif  // EXT_RMANPKG_24_0_PLUGIN_RENDERMAN_PLUGIN_HD_PRMAN_INSTANCER_H