AnimTestbed/3rdparty/ozz-animation/include/ozz/animation/offline/raw_animation_utils.h

//----------------------------------------------------------------------------//
//                                                                            //
// ozz-animation is hosted at http://github.com/guillaumeblanc/ozz-animation  //
// and distributed under the MIT License (MIT).                               //
//                                                                            //
// Copyright (c) Guillaume Blanc                                              //
//                                                                            //
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//----------------------------------------------------------------------------//

#ifndef OZZ_OZZ_ANIMATION_OFFLINE_RAW_ANIMATION_UTILS_H_
#define OZZ_OZZ_ANIMATION_OFFLINE_RAW_ANIMATION_UTILS_H_

#include "ozz/animation/offline/export.h"
#include "ozz/animation/offline/raw_animation.h"

#include "ozz/base/maths/transform.h"
#include "ozz/base/span.h"

namespace ozz {
namespace animation {
namespace offline {

// Translation interpolation method.
OZZ_ANIMOFFLINE_DLL math::Float3 LerpTranslation(const math::Float3& _a,
                                                 const math::Float3& _b,
                             float _alpha);

// Rotation interpolation method.
OZZ_ANIMOFFLINE_DLL math::Quaternion LerpRotation(const math::Quaternion& _a,
                              const math::Quaternion& _b, float _alpha);

// Scale interpolation method.
OZZ_ANIMOFFLINE_DLL math::Float3 LerpScale(const math::Float3& _a,
                                           const math::Float3& _b,
                       float _alpha);

// Samples a RawAnimation track. This function shall be used for offline
// purpose. Use ozz::animation::Animation and ozz::animation::SamplingJob for
// runtime purpose.
// Returns false if track is invalid.
OZZ_ANIMOFFLINE_DLL bool SampleTrack(const RawAnimation::JointTrack& _track,
                                     float _time,
                 ozz::math::Transform* _transform);

// Samples a RawAnimation. This function shall be used for offline
// purpose. Use ozz::animation::Animation and ozz::animation::SamplingJob for
// runtime purpose.
// _animation must be valid.
// Returns false output range is too small or animation is invalid.
OZZ_ANIMOFFLINE_DLL bool SampleAnimation(
    const RawAnimation& _animation, float _time,
                     const span<ozz::math::Transform>& _transforms);

// Implement fixed rate keyframe time iteration. This utility purpose is to
// ensure that sampling goes strictly from 0 to duration, and that period
// between consecutive time samples have a fixed period.
// This sounds trivial, but floating point error could occur if keyframe time
// was accumulated for a long duration.
class OZZ_ANIMOFFLINE_DLL FixedRateSamplingTime {
 public:
  FixedRateSamplingTime(float _duration, float _frequency);

  float time(size_t _key) const {
    assert(_key < num_keys_);
    return ozz::math::Min(_key * period_, duration_);
  }

  size_t num_keys() const { return num_keys_; }

 private:
  float duration_;
  float period_;
  size_t num_keys_;
};
}  // namespace offline
}  // namespace animation
}  // namespace ozz
#endif  // OZZ_OZZ_ANIMATION_OFFLINE_RAW_ANIMATION_UTILS_H_