Macro buffer

macro_rules! buffer {
    { @buffertype STORAGE } => { ... };
    { @buffertype UNIFORM } => { ... };
    { $struct:ident as $( $usage:ident )|+ } => { ... };
    { $struct:ident < $inner:ty > as $storageuniform:ident $( | $usage:ident )* } => { ... };
}

Define a storage buffer, with an optional internal type/struct to align its length with.

For example, if the buffer stores an array of f32 matrices, you could set the internal type to [f32; 16], and the buffer descriptor will initialize a multiple of the internal type’s size.
If omitted, the internal type will default to u8, so you can initialize the buffer using a number of bytes manually.

You also need to specify the wgpu::BufferUsages, but note that it requires either STORAGE or UNIFORM as the first usage.

buffer! { MatrixBuffer <SomeMatrixStructYouDefinedBefore> as UNIFORM | COPY_DST }

let buffer: MatrixBuffer = render_context.new_buffer(1);

queue.write_buffer(&buffer, 0, &[1, 2, 3, ..]);