mtl-rs 0.2.1

Rust bindings for Apple's Metal API
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use objc2::{Encode, Encoding, RefEncode};

#[repr(u64)]
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub enum MTLLanguageVersion {
    #[deprecated(note = "use a newer language standard")]
    Version1_0 = 1 << 16,
    Version1_1 = (1 << 16) + 1,
    Version1_2 = (1 << 16) + 2,
    Version2_0 = 2 << 16,
    Version2_1 = (2 << 16) + 1,
    Version2_2 = (2 << 16) + 2,
    Version2_3 = (2 << 16) + 3,
    Version2_4 = (2 << 16) + 4,
    Version3_0 = (3 << 16),
    Version3_1 = (3 << 16) + 1,
    Version3_2 = (3 << 16) + 2,
    Version4_0 = (4 << 16),
    Version4_1 = (4 << 16) + 1,
}

/// The Metal shading-language version used to compile a library.
///
/// Compatibility alias for the crate's original misspelling of
/// [`MTLLanguageVersion`].
pub type MLTLanguageVersion = MTLLanguageVersion;

unsafe impl Encode for MTLLanguageVersion {
    const ENCODING: Encoding = u64::ENCODING;
}
unsafe impl RefEncode for MTLLanguageVersion {
    const ENCODING_REF: Encoding = Encoding::Pointer(&Self::ENCODING);
}

#[cfg(test)]
mod tests {
    use super::MTLLanguageVersion;

    #[test]
    fn xcode_27_language_versions_match_header_values() {
        assert_eq!(MTLLanguageVersion::Version4_0 as u64, 4 << 16);
        assert_eq!(MTLLanguageVersion::Version4_1 as u64, (4 << 16) + 1);
    }
}