Ensure texture-generated formats default to scalar packing
Ensure texture-generated formats default to scalar packing

* On APIs like OpenGL texture formats (like vertex buffer formats) can be
  tightly packed even in cases that apparently are otherwise not allowed - e.g.
  with fake RGB formats where the stride looks misaligned due to alpha being
  hidden.

Zorro666/renderdoc,baldurk/renderdoc,Zorro666/renderdoc,baldurk/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc,baldurk/renderdoc,baldurk/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc,baldurk/renderdoc,baldurk/renderdoc