1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

/// Wrapper aligning contents to at least 4.
#[repr(align(4))]
pub struct WordAligned<Bytes: ?Sized>(pub Bytes);

/// Treat the given by slice as a SPIR-V module.
///
/// # Errors
///
/// Returns errors when:
///
/// - Input length is not divisible by 4
/// - Input is longer than usize::max_value()
/// - SPIR-V magic number is missing from beginning of stream
pub fn make_spirv<'a>(data: &'a [u8]) -> super::ShaderModuleSource<'a> {
    const MAGIC_NUMBER: u32 = 0x0723_0203;

    let (pre, words, post) = unsafe { data.align_to::<u32>() };
    assert_eq!(pre, &[], "data offset is not aligned to words!");
    assert_eq!(post, &[], "data size is not aligned to words!");
    assert_eq!(
        words[0], MAGIC_NUMBER,
        "wrong magic word {:x}. Make sure you are using a binary SPIRV file.",
        words[0]
    );
    super::ShaderModuleSource::SpirV(words)
}