The number of bits of numeric precision available for each feature channel.
- iOS 10.0+
- macOS 10.13+
- Mac Catalyst 13.0+
- tvOS 10.0+
- Metal Performance Shaders
This is precision, not size (float is 24 bits, not 32; half-precision floating-point is 11 bits, not 16;
Snorm pixel formats have one less bit of precision for the sign bit, etc.). For formats like
MTLPixel, this value is the precision of the most precise channel (which is 6 in this case). When this information is unavailable, typically for compressed formats, this value is 0.