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Fix T62958: Improve exponential easing formula 

Reviewers: brecht

Differential Revision: https://developer.blender.org/D4596
This commit is contained in:
Jacques Lucke 2019-03-26 15:43:51 +01:00
parent 16a04dccd5
commit 9b39a71793
Notes: blender-bot 2023-02-14 05:12:59 +01:00 
Referenced by issue #62958, F-Curve imprecisions for exponential interpolation
1 changed files with 21 additions and 10 deletions
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31
source/blender/blenlib/intern/easing.c
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@ -249,26 +249,37 @@ float BLI_easing_elastic_ease_in_out(float time, float begin, float change, floa
}
}
static const float pow_min = 0.0009765625f; /* = 2^(-10) */
static const float pow_scale = 1.0f / (1.0f - 0.0009765625f);
float BLI_easing_expo_ease_in(float time, float begin, float change, float duration)
{
return (time == 0.0f) ? begin : change * powf(2, 10 * (time / duration - 1)) + begin;
if (time == 0.0) {
return begin;
}
return change * (powf(2, 10 * (time / duration - 1)) - pow_min) * pow_scale + begin;
}
float BLI_easing_expo_ease_out(float time, float begin, float change, float duration)
{
return (time == duration) ? begin + change : change * (-powf(2, -10 * time / duration) + 1) + begin;
if (time == 0.0) {
return begin;
}
return change * (1 - (powf(2, -10 * time / duration) - pow_min) * pow_scale) + begin;
}
float BLI_easing_expo_ease_in_out(float time, float begin, float change, float duration)
{
if (time == 0.0f)
return begin;
if (time == duration)
return begin + change;
if ((time /= duration / 2) < 1)
return change / 2 * powf(2, 10 * (time - 1)) + begin;
time -= 1.0f;
return change / 2 * (-powf(2, -10 * time) + 2) + begin;
float duration_half = duration / 2.0f;
float change_half = change / 2.0f;
if (time <= duration_half) {
return BLI_easing_expo_ease_in(
time, begin, change_half, duration_half);
}
else {
return BLI_easing_expo_ease_out(
time - duration_half, begin + change_half, change_half, duration_half);
}
}
float BLI_easing_linear_ease(float time, float begin, float change, float duration)