In this Metal tutorial, you will learn how to get started with Apple’s 3D graphics API by rendering a simple triangle to the screen.
“8 bytes for Blue, Green, Red and Alpha, in that order — with normalized values between 0 and 1.” should be: “8 Bits, 1 Byte for Blue, Green, Red and Alpha, in that order (32 bits in total) — since it is “Unorm” (unsigned normalized) it means that each of these 8-bit values is stored as an integer between 0 and 255, but when used by the GPU, they are normalized to a floating-point range between 0.0 and 1.0.”