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// Copyright 2017 The Draco Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef DRACO_ANIMATION_KEYFRAME_ANIMATION_H_
#define DRACO_ANIMATION_KEYFRAME_ANIMATION_H_
#include <vector>
#include "draco/point_cloud/point_cloud.h"
namespace draco {
// Class for holding keyframe animation data. It will have two or more
// attributes as a point cloud. The first attribute is always the timestamp
// of the animation. Each KeyframeAnimation could have multiple animations with
// the same number of frames. Each animation will be treated as a point
// attribute.
class KeyframeAnimation : public PointCloud {
public:
// Force time stamp to be float type.
using TimestampType = float;
KeyframeAnimation();
// Animation must have only one timestamp attribute.
// This function must be called before adding any animation data.
// Returns false if timestamp already exists.
bool SetTimestamps(const std::vector<TimestampType> ×tamp);
// Returns an id for the added animation data. This id will be used to
// identify this animation.
// Returns -1 if error, e.g. number of frames is not consistent.
// Type |T| should be consistent with |DataType|, e.g:
// float - DT_FLOAT32,
// int32_t - DT_INT32, ...
template <typename T>
int32_t AddKeyframes(DataType data_type, uint32_t num_components,
const std::vector<T> &data);
const PointAttribute *timestamps() const {
return GetAttributeByUniqueId(kTimestampId);
}
const PointAttribute *keyframes(int32_t animation_id) const {
return GetAttributeByUniqueId(animation_id);
}
// Number of frames should be equal to number points in the point cloud.
void set_num_frames(int32_t num_frames) { set_num_points(num_frames); }
int32_t num_frames() const { return static_cast<int32_t>(num_points()); }
int32_t num_animations() const { return num_attributes() - 1; }
private:
// Attribute id of timestamp is fixed to 0.
static constexpr int32_t kTimestampId = 0;
};
template <typename T>
int32_t KeyframeAnimation::AddKeyframes(DataType data_type,
uint32_t num_components,
const std::vector<T> &data) {
// TODO(draco-eng): Verify T is consistent with |data_type|.
if (num_components == 0) {
return -1;
}
// If timestamps is not added yet, then reserve attribute 0 for timestamps.
if (!num_attributes()) {
// Add a temporary attribute with 0 points to fill attribute id 0.
std::unique_ptr<PointAttribute> temp_att =
std::unique_ptr<PointAttribute>(new PointAttribute());
temp_att->Init(GeometryAttribute::GENERIC, num_components, data_type, false,
0);
this->AddAttribute(std::move(temp_att));
set_num_frames(data.size() / num_components);
}
if (data.size() != num_components * num_frames()) {
return -1;
}
std::unique_ptr<PointAttribute> keyframe_att =
std::unique_ptr<PointAttribute>(new PointAttribute());
keyframe_att->Init(GeometryAttribute::GENERIC, num_components, data_type,
false, num_frames());
const size_t stride = num_components;
for (PointIndex i(0); i < num_frames(); ++i) {
keyframe_att->SetAttributeValue(keyframe_att->mapped_index(i),
&data[i.value() * stride]);
}
return this->AddAttribute(std::move(keyframe_att));
}
} // namespace draco
#endif // DRACO_ANIMATION_KEYFRAME_ANIMATION_H_
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