public void DrawTextureGrid(Rect canvasRect, float zoom, Vector2 pan = default)
{
Texture texture = EditorTools.CreateGridTexture(10, 10);
var size = canvasRect.size;
var center = size / 2f;
float xOffset = -(canvasRect.x * zoom + pan.x) / texture.width;
float yOffset = ((canvasRect.y - size.y) * zoom + pan.y) / texture.height;
Vector2 tileOffset = new Vector2(xOffset, yOffset);
float tileAmountX = Mathf.Round(size.x * zoom) / texture.width;
float tileAmountY = Mathf.Round(size.y * zoom) / texture.height;
Vector2 tileAmount = new Vector2(tileAmountX, tileAmountY);
GUI.DrawTextureWithTexCoords(canvasRect, texture, new Rect(tileOffset, tileAmount));
}