I noticed that MTLPixelFormat has this cases:
case r32Float = 55
case rg32Float = 105
case rgba32Float = 125
But no case rgb32Float. What's the reason for such a discrimination?
Why there's no rgb32Float in Metal?
GPU pixel formats typically use a power-of-2 number of bytes: 1, 2, 4, 8, or 16 bytes, i.e. 8, 16, 32, 64, or 128 bits. The formats you list are 4 bytes, 8, and 16. A hypothetical rgb32Float would be 12 bytes or 96 bits, neither of which is a power of 2.