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#ifndef UNITY_SDF2D_INCLUDED
#define UNITY_SDF2D_INCLUDED
// Ref: https://www.iquilezles.org/www/articles/distfunctions2d/distfunctions2d.htm
float CircleSDF(float2 position, float radius)
{
return length(position) - radius;
}
float RectangleSDF(float2 position, float2 bound)
{
float2 d = abs(position) - bound;
return length(max(d, float2(0, 0))) + min(max(d.x, d.y), 0.0);
}
float EllipseSDF(float2 position, float2 r)
{
float2 p = position;
float2 r2 = r*r;
float k0 = length(p/r);
float k1 = length(p/r2);
return k0*(k0 - 1.0)/k1;
}
#endif // UNITY_SDF2D_INCLUDED