AnimationTranslator.h

#pragma once
#include "AL/usdmaya/fileio/translators/DgNodeTranslator.h"

#include "maya/MPlug.h"
#include <vector>
#include <utility>

#include "pxr/usd/usd/stage.h"

namespace AL {
namespace usdmaya {
namespace fileio {

typedef std::pair<MPlug, UsdAttribute> PlugAttrPair;
typedef std::vector<PlugAttrPair> PlugAttrVector;
typedef std::pair<PlugAttrPair, float> PlugAttrScaledPair;
typedef std::vector<PlugAttrScaledPair> PlugAttrScaledVector;

//----------------------------------------------------------------------------------------------------------------------
//----------------------------------------------------------------------------------------------------------------------
struct AnimationTranslator
{
  static bool isAnimated(const MObject& node, const MObject& attr, const bool assumeExpressionIsAnimated = true)
    { return isAnimated(MPlug(node, attr), assumeExpressionIsAnimated); }

  static bool isAnimated(MPlug attr, bool assumeExpressionIsAnimated = true);

  inline void addPlug(const MPlug& plug, const UsdAttribute& attribute, const bool assumeExpressionIsAnimated)
  {
    if(isAnimated(plug, assumeExpressionIsAnimated))
      m_animatedPlugs.emplace_back(std::make_pair(plug, attribute));
  }

  inline void addPlug(const MPlug& plug, const UsdAttribute& attribute, const float scale, const bool assumeExpressionIsAnimated)
  {
    if(isAnimated(plug, assumeExpressionIsAnimated))
      m_scaledAnimatedPlugs.emplace_back(std::make_pair(std::make_pair(plug, attribute), scale));
  }

  void exportAnimation(const ExporterParams& params);

private:
  PlugAttrVector m_animatedPlugs;
  PlugAttrScaledVector m_scaledAnimatedPlugs;
};

//----------------------------------------------------------------------------------------------------------------------
} // fileio
} // usdmaya
} // AL
//----------------------------------------------------------------------------------------------------------------------