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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
use deno_core::error::type_error;use deno_core::error::AnyError;use deno_core::futures::channel::oneshot;use deno_core::op;use deno_core::OpState;use deno_core::Resource;use deno_core::ResourceId;use deno_core::ZeroCopyBuf;use std::borrow::Cow;use std::cell::RefCell;use std::convert::TryFrom;use std::rc::Rc;use std::time::Duration;
use super::error::DomExceptionOperationError;use super::error::WebGpuResult;
pub(crate) struct WebGpuBuffer(pub(crate) wgpu_core::id::BufferId);impl Resource for WebGpuBuffer {  fn name(&self) -> Cow<str> {    "webGPUBuffer".into()  }}
struct WebGpuBufferMapped(*mut u8, usize);impl Resource for WebGpuBufferMapped {  fn name(&self) -> Cow<str> {    "webGPUBufferMapped".into()  }}
#[op]pub fn op_webgpu_create_buffer(  state: &mut OpState,  device_rid: ResourceId,  label: Option<String>,  size: u64,  usage: u32,  mapped_at_creation: bool,) -> Result<WebGpuResult, AnyError> {  let instance = state.borrow::<super::Instance>();  let device_resource = state    .resource_table    .get::<super::WebGpuDevice>(device_rid)?;  let device = device_resource.0;
  let descriptor = wgpu_core::resource::BufferDescriptor {    label: label.map(Cow::from),    size,    usage: wgpu_types::BufferUsages::from_bits(usage)      .ok_or_else(|| type_error("usage is not valid"))?,    mapped_at_creation,  };
  gfx_put!(device => instance.device_create_buffer(    device,    &descriptor,    std::marker::PhantomData  ) => state, WebGpuBuffer)}
#[op]pub async fn op_webgpu_buffer_get_map_async(  state: Rc<RefCell<OpState>>,  buffer_rid: ResourceId,  device_rid: ResourceId,  mode: u32,  offset: u64,  size: u64,) -> Result<WebGpuResult, AnyError> {  let (sender, receiver) = oneshot::channel::<Result<(), AnyError>>();
  let device;  {    let state_ = state.borrow();    let instance = state_.borrow::<super::Instance>();    let buffer_resource =      state_.resource_table.get::<WebGpuBuffer>(buffer_rid)?;    let buffer = buffer_resource.0;    let device_resource = state_      .resource_table      .get::<super::WebGpuDevice>(device_rid)?;    device = device_resource.0;
    let callback = Box::new(move |status| {      sender        .send(match status {          wgpu_core::resource::BufferMapAsyncStatus::Success => Ok(()),          _ => unreachable!(), // TODO        })        .unwrap();    });
    // TODO(lucacasonato): error handling    let maybe_err = gfx_select!(buffer => instance.buffer_map_async(            buffer,            offset..(offset + size),            wgpu_core::resource::BufferMapOperation {                host: match mode {                    1 => wgpu_core::device::HostMap::Read,                    2 => wgpu_core::device::HostMap::Write,                    _ => unreachable!(),                },                callback: wgpu_core::resource::BufferMapCallback::from_rust(callback),            }        ))        .err();
    if maybe_err.is_some() {      return Ok(WebGpuResult::maybe_err(maybe_err));    }  }
  let done = Rc::new(RefCell::new(false));  let done_ = done.clone();  let device_poll_fut = async move {    while !*done.borrow() {      {        let state = state.borrow();        let instance = state.borrow::<super::Instance>();        gfx_select!(device => instance.device_poll(device, wgpu_types::Maintain::Wait)).unwrap();      }      tokio::time::sleep(Duration::from_millis(10)).await;    }    Ok::<(), AnyError>(())  };
  let receiver_fut = async move {    receiver.await??;    let mut done = done_.borrow_mut();    *done = true;    Ok::<(), AnyError>(())  };
  tokio::try_join!(device_poll_fut, receiver_fut)?;
  Ok(WebGpuResult::empty())}
#[op]pub fn op_webgpu_buffer_get_mapped_range(  state: &mut OpState,  buffer_rid: ResourceId,  offset: u64,  size: Option<u64>,  mut buf: ZeroCopyBuf,) -> Result<WebGpuResult, AnyError> {  let instance = state.borrow::<super::Instance>();  let buffer_resource = state.resource_table.get::<WebGpuBuffer>(buffer_rid)?;  let buffer = buffer_resource.0;
  let (slice_pointer, range_size) =    gfx_select!(buffer => instance.buffer_get_mapped_range(      buffer,      offset,      size    ))    .map_err(|e| DomExceptionOperationError::new(&e.to_string()))?;
  // TODO(crowlKats):  #[allow(clippy::undocumented_unsafe_blocks)]  let slice = unsafe {    std::slice::from_raw_parts_mut(slice_pointer, range_size as usize)  };  buf.copy_from_slice(slice);
  let rid = state    .resource_table    .add(WebGpuBufferMapped(slice_pointer, range_size as usize));
  Ok(WebGpuResult::rid(rid))}
#[op]pub fn op_webgpu_buffer_unmap(  state: &mut OpState,  buffer_rid: ResourceId,  mapped_rid: ResourceId,  buf: Option<ZeroCopyBuf>,) -> Result<WebGpuResult, AnyError> {  let mapped_resource = state    .resource_table    .take::<WebGpuBufferMapped>(mapped_rid)?;  let instance = state.borrow::<super::Instance>();  let buffer_resource = state.resource_table.get::<WebGpuBuffer>(buffer_rid)?;  let buffer = buffer_resource.0;
  if let Some(buf) = buf {    // TODO(crowlKats):    #[allow(clippy::undocumented_unsafe_blocks)]    let slice = unsafe {      std::slice::from_raw_parts_mut(mapped_resource.0, mapped_resource.1)    };    slice.copy_from_slice(&buf);  }
  gfx_ok!(buffer => instance.buffer_unmap(buffer))}