distance field from rectangle

Distance.metal

float distance_from_rect(vector_float2 pixel_pos, vector_float2 rect_center, vector_float2 rect_corner, float corner_radius) {
   vector_float2 p = pixel_pos - rect_center;
   vector_float2 q = abs(p) - (rect_corner - corner_radius);
   return length(max(q, 0.0)) + min(max(q.x, q.y), 0.0) - corner_radius;
}