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45 lines
1.1 KiB
HLSL
45 lines
1.1 KiB
HLSL
#ifndef SDF_INCLUDED
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#define SDF_INCLUDED
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// based on functions by Inigo Quilez
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// https://iquilezles.org/www/articles/distfunctions2d/distfunctions2d.htm
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// SDF of a box
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float sdBox( in float2 p, in float2 b ) {
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float2 d = abs(p)-b;
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return length(max(d,0.0)) + min(max(d.x,d.y),0.0);
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}
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// SDF of a box with corner radius r
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float sdRoundedBox( in float2 p, in float2 b, in float r ) {
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float2 d = abs(p)-b+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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// SDF of a box with corner radius r, based on the current UV position
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// UV must be ∈ (0,1), with (0,0) on one corner
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float sdRoundedUVBox( float2 uv, float r ) {
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float dx = ddx(uv.x);
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float dy = ddy(uv.y);
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float2 dim = abs(float2(1/dx, 1/dy));
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float2 halfDim = dim / 2;
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float2 pos = (dim * uv) - halfDim;
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return sdRoundedBox(pos, halfDim, r);
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}
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inline float SDFdDist(float dist) {
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return length(float2(ddx(dist), ddy(dist)));
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}
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inline float SDFAA(float dist, float ddist) {
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float pixelDist = dist / ddist;
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return saturate(0.5-pixelDist);
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}
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inline float SDFAA(float dist) {
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return SDFAA(dist, SDFdDist(dist));
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}
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#endif |