Easing function macros

$ clib install glisy/ease  --save

#include <glisy/ease.h>
...
float time = glfwGetTime();
vec3 from = {0, 0, 0};
vec3 to = {3, 3, 3};
float from.x = ease_in_cubic(time, from.x, 1, to.x);
float from.y = ease_in_cubic(time, from.y, 1, to.y);
float from.z = ease_in_cubic(time, from.z, 1, to.z);

simple linear tweening - no easing, no acceleration

quadratic easing in - accelerating from zero velocity

quadratic easing out - decelerating to zero velocity

quadratic easing in/out - acceleration until halfway, then deceleration

cubic easing in - accelerating from zero velocity

cubic easing out - decelerating to zero velocity

cubic easing in/out - acceleration until halfway, then deceleration

quartic easing in - accelerating from zero velocity

quartic easing out - decelerating to zero velocity

quartic easing in/out - acceleration until halfway, then deceleration

quintic easing in - accelerating from zero velocity

quintic easing out - decelerating to zero velocity

quintic easing in/out - acceleration until halfway, then deceleration

sinusoidal easing in - accelerating from zero velocity

sinusoidal easing out - decelerating to zero velocity

sinusoidal easing in/out - accelerating until halfway, then decelerating

exponential easing in - accelerating from zero velocity

exponential easing out - decelerating to zero velocity

exponential easing in/out - accelerating until halfway, then decelerating

circular easing in - accelerating from zero velocity

circular easing out - decelerating to zero velocity

circular easing in/out - acceleration until halfway, then deceleration

MIT