title: What compressed texture formats are supported on iOS?
body: <p>Coming from a Windows background, the only compressed file format I'm used to is DDS, which uses S3 DXT compression.</p>
  
  <p>I'm unsure if DDS is supported on iOS devices, and what other options there might be? I've heard of things like Ericsson Texture Compression (ETC) and PVRTC but I don't understand how they all fit together and how much they rely on specific hardware functionality.</p>