using UnityEngine;

[RequireComponent(typeof(SpriteRenderer))]
public class AutoSquareSprite : MonoBehaviour
{
    private static Sprite cachedSquare;

    private void Awake()
    {
        var spriteRenderer = GetComponent<SpriteRenderer>();
        if (spriteRenderer.sprite != null)
        {
            return;
        }

        if (cachedSquare == null)
        {
            var texture = Texture2D.whiteTexture;
            cachedSquare = Sprite.Create(
                texture,
                new Rect(0f, 0f, texture.width, texture.height),
                new Vector2(0.5f, 0.5f),
                1f);
            cachedSquare.name = "RuntimeSquare";
        }

        spriteRenderer.sprite = cachedSquare;
    }
}