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Fixed interpolation alpha in timeline

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brunoherbelin
2020-08-28 22:29:20 +02:00
parent f90964bac8
commit 6213f3da59
1 changed files with 6 additions and 7 deletions
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13
Timeline.cpp
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@@ -1,6 +1,6 @@
#include <algorithm>
#include <cmath>
#include "defines.h"
#include "Log.h"
@@ -194,14 +194,13 @@ void Timeline::clearGaps()
float Timeline::fadingAt(const GstClockTime t)
{
GstClockTime modulo = t % step_;
GstClockTime keyframe = t - modulo;
size_t keyframe_index = CLAMP( (MAX_TIMELINE_ARRAY * keyframe) / timing_.end, 0, MAX_TIMELINE_ARRAY-1);
double true_index = (static_cast<double>(MAX_TIMELINE_ARRAY) * static_cast<double>(t)) / static_cast<double>(timing_.end);
double previous_index = floor(true_index);
float percent = static_cast<float>(true_index - previous_index);
size_t keyframe_index = CLAMP( static_cast<size_t>(previous_index), 0, MAX_TIMELINE_ARRAY-1);
size_t keyframe_next_index = CLAMP( keyframe_index+1, 0, MAX_TIMELINE_ARRAY-1);
float interpol = static_cast<float>( static_cast<double>(modulo) / static_cast<double>(step_) );
float v = fadingArray_[keyframe_index];
v += interpol * (fadingArray_[keyframe_next_index] - fadingArray_[keyframe_index]);
v += percent * (fadingArray_[keyframe_next_index] - fadingArray_[keyframe_index]);
return v;
}