mtl-rs 0.2.1

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

/// Arguments for intersection function buffers (from `MTLIntersectionFunctionBufferArguments`).
///
/// - `intersection_function_buffer` must be 8-byte aligned GPU resource ID.
/// - `intersection_function_buffer_size` is the maximum byte range usable for ray tracing.
/// - `intersection_function_stride` must be 0 or 8-byte aligned; only the lower 12 bits are used.
#[repr(C)]
#[derive(Clone, Copy, Debug, PartialEq)]
pub struct MTLIntersectionFunctionBufferArguments {
    pub intersection_function_buffer: u64,
    pub intersection_function_buffer_size: u64,
    pub intersection_function_stride: u64,
}

unsafe impl Encode for MTLIntersectionFunctionBufferArguments {
    const ENCODING: Encoding = Encoding::Struct("?", &[u64::ENCODING, u64::ENCODING, u64::ENCODING]);
}

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

#[cfg(test)]
mod tests {
    use core::mem::{align_of, size_of};

    use super::MTLIntersectionFunctionBufferArguments;

    #[test]
    fn buffer_arguments_match_the_metal_abi() {
        assert_eq!(size_of::<MTLIntersectionFunctionBufferArguments>(), 24);
        assert_eq!(align_of::<MTLIntersectionFunctionBufferArguments>(), 8);
    }
}