let mut egui_painter = egui_vulkano::Painter::new(
    device.clone(), // your Vulkano Device
    queue.clone(), // your Vulkano Queue
    Subpass::from(render_pass.clone(), 1).unwrap(), // subpass that you set up to render the gui
)
.unwrap();

// ...

// Get the shapes from egui
let egui_output = egui_ctx.end_frame();
let result = egui_painter.update_textures(egui_output.textures_delta, &mut builder).unwrap();
// If using egui-winit:
egui_winit.handle_platform_output(surface.window(), &egui_ctx, egui_output.platform_output);

// Do your own rendering ...

// Automatically start the next render subpass and draw the gui
egui_painter
    .draw(
        &mut builder, // your vulkano AutoCommandBufferBuilder
        [width, height], // window size
        &egui_ctx, // your egui CtxRef
        egui_output.shapes // shapes from egui,
    )
    .unwrap();