lygia/v1.2.0/math/aafloor)Is similar to floor() but has a 2-pixel wide gradient between clamped steps to allow the edges in the result to be anti-aliased. Based on examples https://www.shadertoy.com/view/4l2BRD and https://www.shadertoy.com/view/3tSGWy
Dependencies:
Use:
<float> aafloor(<float> x)
#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
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