109 lines
2.8 KiB
C++
109 lines
2.8 KiB
C++
#define _USE_MATH_DEFINES
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#include <cmath>
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#include "track.h"
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#include "data.h"
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using namespace sync;
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#include <cstddef>
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/*#ifndef M_PI
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#define M_PI
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#endif */
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static inline float step(Track::KeyFrameContainer::const_iterator lower, Track::KeyFrameContainer::const_iterator upper, float time)
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{
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return lower->second.value;
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}
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static inline float lerp(Track::KeyFrameContainer::const_iterator lower, Track::KeyFrameContainer::const_iterator upper, float time)
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{
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// find local time
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float t = (time - lower->first) / (upper->first - lower->first);
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// lerp, bitch
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float delta = upper->second.value - lower->second.value;
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return lower->second.value + delta * t;
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}
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static inline float cosine(Track::KeyFrameContainer::const_iterator lower, Track::KeyFrameContainer::const_iterator upper, float time)
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{
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// find local time
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float t = (time - lower->first) / (upper->first - lower->first);
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t = float((1.0 - cos(t * M_PI)) * 0.5);
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// lerp, bitch
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float delta = upper->second.value - lower->second.value;
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return lower->second.value + delta * t;
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}
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static inline float ramp(Track::KeyFrameContainer::const_iterator lower, Track::KeyFrameContainer::const_iterator upper, float time)
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{
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// find local time
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float t = (time - lower->first) / (upper->first - lower->first);
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t = powf(t, 2.0f);
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// lerp, bitch
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float delta = upper->second.value - lower->second.value;
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return lower->second.value + delta * t;
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}
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/*float cosine(float time) const;
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float ramp(float time) const; */
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float Track::getValue(float time) const
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{
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if (keyFrames.size() == 0) return 0.0f;
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// find bounding keyframes
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int currRow = int(floor(time));
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KeyFrameContainer::const_iterator upper = keyFrames.upper_bound(currRow);
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KeyFrameContainer::const_iterator lower = upper;
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lower--;
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// bounds check
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if (lower == keyFrames.end()) return upper->second.value;
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if (upper == keyFrames.end()) return lower->second.value;
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switch (lower->second.interpolationType)
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{
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case Track::KeyFrame::IT_STEP: return step( lower, upper, time);
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case Track::KeyFrame::IT_LERP: return lerp( lower, upper, time);
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case Track::KeyFrame::IT_COSINE: return cosine(lower, upper, time);
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case Track::KeyFrame::IT_RAMP: return ramp( lower, upper, time);
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default:
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assert(false);
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return step(lower, upper, time);
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}
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}
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bool Track::isKeyFrame(size_t row) const
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{
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return keyFrames.find(row) != keyFrames.end();
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}
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const Track::KeyFrame *Track::getKeyFrame(size_t row) const
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{
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KeyFrameContainer::const_iterator iter = keyFrames.find(row);
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if (iter == keyFrames.end()) return NULL;
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return &iter->second;
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}
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void Track::deleteKeyFrame(size_t row)
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{
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keyFrames.erase(row);
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}
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void Track::setKeyFrame(size_t row, const KeyFrame &keyFrame)
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{
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keyFrames[row] = keyFrame;
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}
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size_t Track::getFrameCount() const
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{
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if (keyFrames.empty()) return 0;
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KeyFrameContainer::const_iterator iter = keyFrames.end();
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iter--;
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return iter->first;
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}
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