/// Returns raw `gfx-rs` state objects, if you want to use `gfx-rs` to write
/// your own graphics pipeline then this gets you the interfaces you need
/// to do so.
/// Returns all the relevant objects at once;
/// getting them one by one is awkward 'cause it tends to create double-borrows
/// on the Context object.
pub fn gfx_objects(
    context: &mut Context,
) -> (
    &mut <GlBackendSpec as BackendSpec>::Factory,
    &mut <GlBackendSpec as BackendSpec>::Device,
    &mut gfx::Encoder<
        <GlBackendSpec as BackendSpec>::Resources,
        <GlBackendSpec as BackendSpec>::CommandBuffer,
    >,
    gfx::handle::RawDepthStencilView<<GlBackendSpec as BackendSpec>::Resources>,
    gfx::handle::RawRenderTargetView<<GlBackendSpec as BackendSpec>::Resources>,
) {
    let gfx = &mut context.gfx_context;
    let f = &mut gfx.factory;
    let d = gfx.device.as_mut();
    let e = &mut gfx.encoder;
    let dv = gfx.depth_view.clone();
    let cv = gfx.data.out.clone();
    (f, d, e, dv, cv)
}