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#[macro_export]
macro_rules! vertex_attr_array {
($($loc:expr => $fmt:ident),*) => {
$crate::vertex_attr_array!([] ; 0; $($loc => $fmt ,)*)
};
([$($t:expr,)*] ; $off:expr ;) => { [$($t,)*] };
([$($t:expr,)*] ; $off:expr ; $loc:expr => $item:ident, $($ll:expr => $ii:ident ,)*) => {
$crate::vertex_attr_array!(
[$($t,)*
$crate::VertexAttributeDescriptor {
format: $crate::VertexFormat :: $item,
offset: $off,
shader_location: $loc,
},];
$off + $crate::vertex_format_size!($item);
$($ll => $ii ,)*
)
};
}
#[macro_export]
macro_rules! vertex_format_size {
(Uchar2) => { 2 };
(Uchar4) => { 4 };
(Char2) => { 2 };
(Char4) => { 4 };
(Uchar2Norm) => { 2 };
(Uchar4Norm) => { 4 };
(Char2Norm) => { 2 };
(Char4Norm) => { 4 };
(Ushort2) => { 4 };
(Ushort4) => { 8 };
(Short2) => { 4 };
(Short4) => { 8 };
(Ushort2Norm) => { 4 };
(Ushort4Norm) => { 8 };
(Short2Norm) => { 4 };
(Short4Norm) => { 8 };
(Half2) => { 4 };
(Half4) => { 8 };
(Float) => { 4 };
(Float2) => { 8 };
(Float3) => { 12 };
(Float4) => { 16 };
(Uint) => { 4 };
(Uint2) => { 8 };
(Uint3) => { 12 };
(Uint4) => { 16 };
(Int) => { 4 };
(Int2) => { 8 };
(Int3) => { 12 };
(Int4) => { 16 };
}
#[test]
fn test_vertex_attr_array() {
let attrs = vertex_attr_array![0 => Float2, 3 => Ushort4];
assert_eq!(attrs.len(), 2);
assert_eq!(attrs[0].offset, 0);
assert_eq!(attrs[0].shader_location, 0);
assert_eq!(attrs[1].offset, std::mem::size_of::<(f32, f32)>() as u64);
assert_eq!(attrs[1].shader_location, 3);
}