use std::{thread, time::Duration};

async fn run() {
    let ins = wgpu::Instance::new(wgpu::InstanceDescriptor {
        backends: wgpu::Backends::DX12,
        ..Default::default()
    });
    let adp = ins
        .request_adapter(&wgpu::RequestAdapterOptions::default())
        .await
        .unwrap();
    let info = adp.get_info();
    println!("Using {} ({} {})", info.name, info.backend, info.driver);
    let (dev, que) = adp
        .request_device(
            &wgpu::DeviceDescriptor {
                memory_hints: wgpu::MemoryHints::MemoryUsage,
                ..Default::default()
            },
            None,
        )
        .await
        .unwrap();
    let buf_src = vec![255u8; 4 << 10];
    loop {
        let buf = dev.create_buffer(&wgpu::BufferDescriptor {
            label: None,
            size: 4 << 10,
            usage: wgpu::BufferUsages::COPY_DST | wgpu::BufferUsages::UNIFORM,
            mapped_at_creation: false,
        });
        que.write_buffer(&buf, 0, &buf_src);
        dev.poll(wgpu::Maintain::Wait);
        que.submit(None);
        thread::sleep(Duration::from_secs_f32(1. / 60.));
    }
}
pub fn main() {
    pollster::block_on(run());
}