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03_command_buffer_blit/
03_command_buffer_blit.rs

1use apple_metal::{resource_options, MetalDevice};
2
3fn main() {
4    let dev = MetalDevice::system_default().expect("no Metal");
5    let queue = dev.new_command_queue().expect("queue");
6    let src = dev
7        .new_buffer(64, resource_options::STORAGE_MODE_SHARED)
8        .expect("src");
9    let dst = dev
10        .new_buffer(64, resource_options::STORAGE_MODE_SHARED)
11        .expect("dst");
12    let _ = src.write_bytes(b"hello GPU blit from apple-metal-rs!!!!!");
13
14    let cb = queue.new_command_buffer().expect("cb");
15    assert!(cb.blit_copy_buffer(&src, 0, &dst, 0, 64));
16    cb.commit();
17    cb.wait_until_completed();
18
19    let p = dst.contents().unwrap().cast::<u8>();
20    let bytes = unsafe { core::slice::from_raw_parts(p, 40) };
21    let s = String::from_utf8_lossy(bytes);
22    println!("GPU blit result: {s:?}");
23    assert!(s.starts_with("hello GPU blit"));
24}