41 lines
741 B
HLSL
41 lines
741 B
HLSL
struct SDF {
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float dot2(float2 a)
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{
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return dot(a,a);
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}
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float circle(float2 p, float r)
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{
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return length(p) - r;
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}
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// p = uv point
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// b = width,height
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// r = roundedness of the 4 corners
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float rounded_box(float2 p, float2 b, float4 r)
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{
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r.xy = (p.x>0.0)?r.xy : r.zw;
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r.x = (p.y>0.0)?r.x : r.y;
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float2 q = abs(p)-b+r.x;
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return min(max(q.x,q.y),0.0) + length(max(q,0.0)) - r.x;
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}
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float box(float2 p, float2 b)
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{
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float2 d = abs(p)-b;
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return length(max(d,0)) + min(max(d.x,d.y),0);
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}
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float heart( in float2 p )
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{
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p.x = abs(p.x);
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if( p.y+p.x>1.0 )
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return sqrt(dot2(p-float2(0.25,0.75))) - sqrt(2.0)/4.0;
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return sqrt(min(dot2(p-float2(0.00,1.00)), dot2(p-0.5*max(p.x+p.y,0.0)))) * sign(p.x-p.y);
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}
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};
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SDF sdf; |