The Metal API added with iOS 8 provides an alternative to OpenGL for graphics programming with lower overhead and increased performance with Apple’s A7 and the new A8 in the iPhone 6 and iPhone 6 Plus.
Apple has provided a nice amount of documentation, video presentation and examples that you can find over on the Metal for Developers page.
Ray Wenderlich has written a nice straightforward overview comparing Metal to OpenGL ES, SpriteKit, and Unity and step-by-step going through the process of creating a simple scene with Metal explaining shader basics and more.
You can find the tutorial on Ray Wenderlich’s site here.
A nice guide for those getting started with the metal API.
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