Skip to content

Instantly share code, notes, and snippets.

@thomasvanta

thomasvanta/Easing.hlsl

Forked from mattatz/Easing.hlsl
Created January 16, 2020 15:07
Show Gist options
  • Save thomasvanta/1b9b2b85051f74593babf43ef8d5a5e0 to your computer and use it in GitHub Desktop.
Save thomasvanta/1b9b2b85051f74593babf43ef8d5a5e0 to your computer and use it in GitHub Desktop.
Download ZIP

Revisions

  1. @mattatz mattatz created this gist Jan 19, 2018.
    201 changes: 201 additions & 0 deletions Easing.hlsl
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,201 @@
    #ifndef _EASING_INCLUDED_
    #define _EASING_INCLUDED_

    float ease_linear(float x) {
    return x;
    }

    float ease_in_quad(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    return c*(t/=d)*t + b;
    }

    float ease_out_quad(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    return -c *(t/=d)*(t-2) + b;
    }

    float ease_in_out_quad(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    if ((t/=d/2) < 1) return c/2*t*t + b;
    return -c/2 * ((--t)*(t-2) - 1) + b;
    }

    float ease_in_cubic(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    return c*(t/=d)*t*t + b;
    }

    float ease_out_cubic(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    return c*((t=t/d-1)*t*t + 1) + b;
    }

    float ease_in_out_cubic(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    if ((t/=d/2) < 1) return c/2*t*t*t + b;
    return c/2*((t-=2)*t*t + 2) + b;
    }

    float ease_in_quart(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    return c*(t/=d)*t*t*t + b;
    }

    float ease_out_quart(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    return -c * ((t=t/d-1)*t*t*t - 1) + b;
    }

    float ease_in_out_quart(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
    return -c/2 * ((t-=2)*t*t*t - 2) + b;
    }

    float ease_in_quint(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    return c*(t/=d)*t*t*t*t + b;
    }

    float ease_out_quint(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    return c*((t=t/d-1)*t*t*t*t + 1) + b;
    }

    float ease_in_out_quint(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
    return c/2*((t-=2)*t*t*t*t + 2) + b;
    }

    float ease_in_sine(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    return -c * cos(t/d * (3.14159265359/2)) + c + b;
    }

    float ease_out_sine(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    return c * sin(t/d * (3.14159265359/2)) + b;
    }

    float ease_in_out_Sine(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    return -c/2 * (cos(3.14159265359*t/d) - 1) + b;
    }

    float ease_in_expo(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    return (t==0) ? b : c * pow(2, 10 * (t/d - 1)) + b;
    }

    float ease_out_expo(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    return (t==d) ? b+c : c * (-pow(2, -10 * t/d) + 1) + b;
    }

    float ease_in_out_expo(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    if (t==0) return b;
    if (t==d) return b+c;
    if ((t/=d/2) < 1) return c/2 * pow(2, 10 * (t - 1)) + b;
    return c/2 * (-pow(2, -10 * --t) + 2) + b;
    }

    float ease_in_circ(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    return -c * (sqrt(1 - (t/=d)*t) - 1) + b;
    }

    float ease_out_circ(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    return c * sqrt(1 - (t=t/d-1)*t) + b;
    }

    float ease_in_out_circ(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    if ((t/=d/2) < 1) return -c/2 * (sqrt(1 - t*t) - 1) + b;
    return c/2 * (sqrt(1 - (t-=2)*t) + 1) + b;
    }

    float ease_in_elastic(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    float s=1.70158;float p=0;float a=c;
    if (t==0) return b; if ((t/=d)==1) return b+c; if (p == 0) p=d*.3;
    if (a < abs(c)) { a=c; s=p/4; }
    else s = p/(2*3.14159265359) * asin (c/a);
    return -(a*pow(2,10*(t-=1)) * sin( (t*d-s)*(2*3.14159265359)/p )) + b;
    }

    float ease_out_elastic(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    float s=1.70158;float p=0;float a=c;
    if (t==0) return b; if ((t/=d)==1) return b+c; if (p ==0) p=d*.3;
    if (a < abs(c)) { a=c; s=p/4; }
    else s = p/(2*3.14159265359) * asin (c/a);
    return a*pow(2,-10*t) * sin( (t*d-s)*(2*3.14159265359)/p ) + c + b;
    }

    float ease_in_out_elastic(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    float s=1.70158;float p=0;float a=c;
    if (t==0) return b; if ((t/=d/2)==2) return b+c; if (p ==0) p=d*(.3*1.5);
    if (a < abs(c)) { a=c; s=p/4; }
    else s = p/(2*3.14159265359) * asin (c/a);
    if (t < 1) return -.5*(a*pow(2,10*(t-=1)) * sin( (t*d-s)*(2*3.14159265359)/p )) + b;
    return a*pow(2,-10*(t-=1)) * sin( (t*d-s)*(2*3.14159265359)/p )*.5 + c + b;
    }

    float ease_in_back(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    float s = 1.70158;
    return c*(t/=d)*t*((s+1)*t - s) + b;
    }

    float ease_out_back(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    float s = 1.70158;
    return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
    }

    float ease_in_out_back(float x) {
    float t = x; float b = 0; float c = 1; float d = 1;
    float s = 1.70158;
    if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
    return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
    }

    float ease_out_bounce(float x, float t, float b, float c, float d) {
    if ((t/=d) < (1/2.75)) {
    return c*(7.5625*t*t) + b;
    } else if (t < (2/2.75)) {
    return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
    } else if (t < (2.5/2.75)) {
    return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
    } else {
    return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
    }
    }

    float ease_out_bounce(float x){
    return ease_out_bounce(x, x, 0, 1, 1);
    }

    float ease_in_bounce(float x, float t, float b, float c, float d) {
    return c - ease_out_bounce (x, d-t, 0, c, d) + b;
    }

    float ease_in_bounce(float x){
    return ease_in_bounce(x, x, 0, 1, 1);
    }

    float ease_in_out_bounce(float x, float t, float b, float c, float d) {
    if (t < d/2) return ease_in_bounce (x, t*2, 0, c, d) * .5 + b;
    return ease_out_bounce (x, t*2-d, 0, c, d) * .5 + c*.5 + b;
    }

    float ease_in_out_bounce(float x){
    return ease_in_out_bounce(x, x, 0, 1, 1);
    }

    #endif // _EASING_INCLUDED_