//
// Copyright 2016 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.
//
#include "pxr/imaging/hd/instancer.h"
#include "pxr/imaging/hd/renderIndex.h"
#include "pxr/imaging/hd/rprim.h"
#include "pxr/imaging/hd/tokens.h"

PXR_NAMESPACE_OPEN_SCOPE

HdInstancer::HdInstancer(HdSceneDelegate* delegate,
                         SdfPath const& id,
                         SdfPath const &parentId)
    : _delegate(delegate)
    , _id(id)
    , _parentId(parentId)
{
}

/* static */
int
HdInstancer::GetInstancerNumLevels(HdRenderIndex& index,
                                   HdRprim const& rprim)
{
    // Walk up the instancing hierarchy to figure out how many levels of
    // instancing the passed-in rprim has.

    int instancerLevels = 0;
    SdfPath parent = rprim.GetInstancerId();
    HdInstancer *instancer = nullptr;
    while (!parent.IsEmpty()) {
        instancerLevels++;
        instancer = index.GetInstancer(parent);
        TF_VERIFY(instancer);
        parent = instancer ? instancer->GetParentId()
            : SdfPath::EmptyPath();
    }
    return instancerLevels;
}

TfTokenVector const &
HdInstancer::GetBuiltinPrimvarNames() const
{
    static const TfTokenVector primvarNames = {
        HdInstancerTokens->instanceTransform,
        HdInstancerTokens->rotate,
        HdInstancerTokens->scale,
        HdInstancerTokens->translate
    };
    return primvarNames;
}

PXR_NAMESPACE_CLOSE_SCOPE