LYGIA Shader Library

Dependencies:

• lygia/v1.1.6/math/map.glsl

Use:

<float> aafloor(<float> x)

Check it on Github

#ifndef FNC_AAFLOOR
#define FNC_AAFLOOR

#if defined(GL_OES_standard_derivatives)
#extension GL_OES_standard_derivatives : enable
#endif

float aafloor(float x) {
#if !defined(GL_ES) || __VERSION__ >= 300 || defined(GL_OES_standard_derivatives)
    float afwidth = 2.0 * length(vec2(dFdx(x), dFdy(x)));
    float fx = fract(x);
    float idx = 1. - afwidth;
    return (fx < idx) ? x - fx : map(fx, idx, 1., x-fx, x);
#elif defined(AA_EDGE)
    float afwidth = AA_EDGE;
    float fx = fract(x);
    float idx = 1. - afwidth;
    return (fx < idx) ? x - fx : map(fx, idx, 1., x-fx, x);
#else 
    return floor(x);
#endif
}

vec2 aafloor(vec2 x) {
    return vec2(aafloor(x.x), aafloor(x.y));
}

#endif