Function rendy::graph::gfx_acquire_barriers

pub fn gfx_acquire_barriers<'b, B, impl IntoIterator, impl IntoIterator>(
    ctx: &'a GraphContext<B>, 
    buffers: impl IntoIterator, 
    images: impl IntoIterator
) -> (Range<PipelineStage>, Vec<Barrier<'a, B>>) where
    B: Backend,
    impl IntoIterator: IntoIterator<Item = &'b NodeBuffer>,
    impl IntoIterator: IntoIterator<Item = &'b NodeImage>, 

Convert graph barriers into gfx barriers.