mev 0.1.0

Metal Et Vulkan abstraction
Documentation 
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use std::{fmt, ops::Deref};

use foreign_types::ForeignType;

use crate::generic::{DeviceError, OutOfMemory, PipelineStages};

use super::{CommandBuffer, CommandEncoder, Device, Frame};

pub struct Queue {
    device: Device,
    queue: metal::CommandQueue,
    last_cbuf: Option<metal::CommandBuffer>,
}

unsafe impl Send for Queue {}
unsafe impl Sync for Queue {}

impl fmt::Debug for Queue {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("Queue")
            .field("device", &self.device.metal())
            .field("queue", &self.queue.as_ptr())
            .finish()
    }
}

impl Queue {
    pub(super) fn new(device: Device, queue: metal::CommandQueue) -> Self {
        Queue {
            device,
            queue,
            last_cbuf: None,
        }
    }
}

impl Deref for Queue {
    type Target = Device;

    #[inline(always)]
    fn deref(&self) -> &Device {
        &self.device
    }
}

impl crate::traits::Resource for Queue {}

#[hidden_trait::expose]
impl crate::traits::Queue for Queue {
    fn device(&self) -> &Device {
        &self.device
    }

    fn family(&self) -> u32 {
        0
    }

    fn new_command_encoder(&mut self) -> CommandEncoder {
        CommandEncoder::new(
            self.device.metal().to_owned(),
            self.queue.new_command_buffer().to_owned(),
        )
    }

    fn submit<I>(&mut self, command_buffers: I) -> Result<(), DeviceError>
    where
        I: IntoIterator<Item = CommandBuffer>,
    {
        let last_cbuf = command_buffers
            .into_iter()
            .map(CommandBuffer::commit)
            .last();

        if let Some(last_cbuf) = last_cbuf {
            self.last_cbuf = Some(last_cbuf);
        }

        Ok(())
    }

    fn submit_with_checkpoint<I>(&mut self, command_buffers: I) -> Result<(), DeviceError>
    where
        I: IntoIterator<Item = crate::backend::CommandBuffer>,
    {
        let last_cbuf = command_buffers
            .into_iter()
            .map(CommandBuffer::commit)
            .last();

        if let Some(last_cbuf) = last_cbuf {
            self.last_cbuf = Some(last_cbuf);
        }

        Ok(())
    }

    fn sync_frame(&mut self, _frame: &mut Frame, _before: PipelineStages) {}

    fn wait_idle(&self) -> Result<(), DeviceError> {
        if let Some(last_cbuf) = &self.last_cbuf {
            last_cbuf.wait_until_completed();
        }
        Ok(())
    }
}