lygia/v1.1.6/animation/easing/circularIn)circular in easing. From https://github.com/stackgl/glsl-easings
Use:
circularIn(<float> x)
#ifndef FNC_CIRCULARIN
#define FNC_CIRCULARIN
float circularIn(in float t) { return 1.0 - sqrt(1.0 - t * t); }
#endif
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