title: Crop and scale MTLTexture
body: <p>Can I create a new <code>MTLTexture</code> of dimensions <code>w2/h2</code> of an existing <code>MTLTexture</code> region <code>x1/y1/w1/h1</code>?</p>
  
  <p>PS: I thought about using <code>MTLTexture.buffer?.makeTexture</code> but the offset needs to be 64 bytes. Why?</p>