39 lines
1 KiB
HLSL
39 lines
1 KiB
HLSL
/*
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contributors: Patricio Gonzalez Vivo
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description: Returns a rectangular SDF
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use: rectSDF(<float2> st, <float2> size)
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license:
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Prosperity License - https://prosperitylicense.com/versions/3.0.0
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Patron License - https://lygia.xyz/license
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*/
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#ifndef FNC_RECTSDF
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#define FNC_RECTSDF
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float rectSDF(float2 p, float2 b, float r) {
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float2 d = abs(p - 0.5) * 4.2 - b + float2(r, r);
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return min(max(d.x, d.y), 0.0) + length(max(d, 0.0)) - r;
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}
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float rectSDF(float2 p, float b, float r) {
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return rectSDF(p, float2(b, b), r);
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}
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float rectSDF(in float2 st, in float2 s) {
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#ifdef CENTER_2D
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st -= CENTER_2D;
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st *= 2.0;
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#else
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st = st * 2.0 - 1.0;
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#endif
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return max( abs(st.x / s.x),
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abs(st.y / s.y) );
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}
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float rectSDF(in float2 st, in float s) {
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return rectSDF(st, float2(s, s) );
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}
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float rectSDF(in float2 st) {
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return rectSDF(st, float2(1.0, 1.0));
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}
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#endif
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