Usage:

1. Add this to your Stage:

.with_pass(amethyst_imgui::DrawUi::default())

2. Add this to GameDataBuilder:

GameDataBuilder::default()
	.with(amethyst_imgui::BeginFrame::default(), "imgui_begin", &[])
	.with_barrier()
	// --- everything else ---
	.with_barrier()
	.with(amethyst_imgui::EndFrame::default(), "imgui_end", &["imgui_begin"]);

3. Use it in any System:

amethyst_imgui::with(|ui| {
	ui.show_demo_window(&mut true);
});

It's annoying that my window/widget state is reset:

Add an ImguiIni resource.

world.add_resource(amethyst_imgui::ImguiIni::new("imgui.ini"));

Example:

cargo run --example demo_window