main.rs - mozsearch

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// Copyright 2020 GFX developers

//

// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or

// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or

// http://opensource.org/licenses/MIT>, at your option. This file may not be

// copied, modified, or distributed except according to those terms.

use dispatch::{Queue, QueueAttribute};

use metal::*;

/// This example replicates `Synchronizing Events Between a GPU and the CPU` article.

/// See https://developer.apple.com/documentation/metal/synchronization/synchronizing_events_between_a_gpu_and_the_cpu

fn main() {

    let device = Device::system_default().expect("No device found");

    let command_queue = device.new_command_queue();

    let command_buffer = command_queue.new_command_buffer();

    // Shareable event

    let shared_event = device.new_shared_event();

    // Shareable event listener

    let my_queue = Queue::create(

        "com.example.apple-samplecode.MyQueue",

        QueueAttribute::Serial,

);

    // Enable `dispatch` feature to use dispatch queues,

    // otherwise unsafe `from_queue_handle` is available for use with native APIs.

    let shared_event_listener = SharedEventListener::from_queue(&my_queue);

    // Register CPU work

    let notify_block = block::ConcreteBlock::new(move |evt: &SharedEventRef, val: u64| {

        println!("Got notification from GPU: {}", val);

        evt.set_signaled_value(3);

});

    shared_event.notify(&shared_event_listener, 2, notify_block.copy());

    // Encode GPU work

    command_buffer.encode_signal_event(&shared_event, 1);

    command_buffer.encode_signal_event(&shared_event, 2);

    command_buffer.encode_wait_for_event(&shared_event, 3);

    command_buffer.commit();

    command_buffer.wait_until_completed();

    println!("Done");