lygia/v1.1.6/animation/easing/backIn)Back in easing. From https://github.com/stackgl/glsl-easings
Dependencies:
Use:
backIn(<float> x)
#ifndef FNC_BACKIN
#define FNC_BACKIN
float backIn(in float t) { return pow(t, 3.) - t * sin(t * PI); }
#endif
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