topology.h

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//
// Copyright 2016 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_USD_USD_SKEL_TOPOLOGY_H
#define PXR_USD_USD_SKEL_TOPOLOGY_H


#include "pxr/pxr.h"
#include "pxr/usd/usdSkel/api.h"

#include "pxr/base/tf/span.h"
#include "pxr/usd/sdf/path.h"
#include "pxr/usd/sdf/types.h"


PXR_NAMESPACE_OPEN_SCOPE


class UsdSkelTopology
{
public:
    UsdSkelTopology() = default;

    USDSKEL_API
    UsdSkelTopology(TfSpan<const TfToken> paths);

    USDSKEL_API
    UsdSkelTopology(TfSpan<const SdfPath> paths);

    USDSKEL_API
    UsdSkelTopology(const VtIntArray& parentIndices);

    USDSKEL_API
    bool Validate(std::string* reason=nullptr) const;

    const VtIntArray& GetParentIndices() const { return _parentIndices; }

    size_t GetNumJoints() const { return size(); }

    size_t size() const { return _parentIndices.size(); }

    inline int GetParent(size_t index) const;

    bool IsRoot(size_t index) const { return GetParent(index) < 0; }

    bool operator==(const UsdSkelTopology& o) const;

    bool operator!=(const UsdSkelTopology& o) const {
        return !(*this == o);
    }

private:
    VtIntArray _parentIndices;
};


int
UsdSkelTopology::GetParent(size_t index) const
{
    TF_DEV_AXIOM(index < _parentIndices.size());
    return _parentIndices[index];
}


PXR_NAMESPACE_CLOSE_SCOPE

#endif // PXR_USD_USD_SKEL_TOPOLOGY_H