lygia/animation/easing/sineInOut)Sine in/out easing. From https://github.com/stackgl/glsl-easings
Dependencies:
Use:
sineInOut(<float> x)
#ifndef FNC_SINEINOUT
#define FNC_SINEINOUT
float sineInOut(in float t) { return -0.5 * (cos(PI * t) - 1.0); }
#endif
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