Borders

borders.metal

fragment float4 rect_fragment_shader(
       RectFragmentData in [[stage_in]],
constant Uniforms *uniforms [[buffer(0)]])
{
   vector_float2 border_corner = in.rect_corner;
   if (in.position.y >= in.rect_center.y) {
       border_corner.y -= in.border_bottom;
   } else {   
       border_corner.y -= in.border_top;
   }
   if (in.position.x >= in.rect_center.x) {
       border_corner.x -= in.border_right;
   } else {
       border_corner.x -= in.border_left;
   }
   ...

}