Macro offsetable_struct 

macro_rules! offsetable_struct {
    (
		$( #[$attribute: meta] )*
		$struct_vis: vis struct $name: ident {
			$(
				$field_vis: vis $field: ident: $ftype: ty
			),*
		} repr(C) as $offsets_name: ident
	) => { ... };
}

Creates a repr(C) struct and a companion offsets struct which represents byte offsets of the fields.

offsetable_struct! {
	#[derive(Debug)]
	pub struct Name {
		pub a: f32,
		pub b: [f32; 4],
		c: u8
	} repr(C) as NameOffsets
}

expands to:

#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash, Ord, PartialOrd)]
pub struct NameOffsets {
	pub a: usize,
	pub b: usize,
	c: usize
}

#[derive(Debug)]
#[repr(C)]
pub struct Name {
	pub a: f32,
	pub b: [f32; 4],
	c: u8
}
impl Name {
	#[allow(unused_variables)]
	pub const fn offsets() -> NameOffsets {
		let current_offset: usize = 0;

		let a = vulkayes_core::util::align_up(current_offset, std::mem::align_of::<f32>());
		let current_offset = a + std::mem::size_of::<f32>();

		let b = vulkayes_core::util::align_up(current_offset, std::mem::align_of::<[f32; 4]>());
		let current_offset = b + std::mem::size_of::<[f32; 4]>();

		let c = vulkayes_core::util::align_up(current_offset, std::mem::align_of::<u8>());
		let current_offset = c + std::mem::size_of::<u8>();

		NameOffsets {
			a,
			b,
			c
		}
	}
}