fence_waiter_vk.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#pragma once
 
#include <condition_variable>
#include <memory>
#include <thread>
#include <vector>
 
#include "flutter/fml/closure.h"
#include "flutter/fml/macros.h"
#include "impeller/base/thread.h"
#include "impeller/renderer/backend/vulkan/device_holder.h"
#include "impeller/renderer/backend/vulkan/shared_object_vk.h"
#include "impeller/renderer/backend/vulkan/vk.h"
 
namespace impeller {
 
class ContextVK;
class WaitSetEntry;
 
using WaitSet = std::vector<std::shared_ptr<WaitSetEntry>>;
 
class FenceWaiterVK {
 public:
  ~FenceWaiterVK();
 
  bool IsValid() const;
 
  void Terminate();
 
  bool AddFence(vk::UniqueFence fence, const fml::closure& callback);
 
 private:
  friend class ContextVK;
 
  std::weak_ptr<DeviceHolder> device_holder_;
  std::unique_ptr<std::thread> waiter_thread_;
  std::mutex wait_set_mutex_;
  std::condition_variable wait_set_cv_;
  WaitSet wait_set_;
  bool terminate_ = false;
 
  explicit FenceWaiterVK(std::weak_ptr<DeviceHolder> device_holder);
 
  void Main();
 
  bool Wait();
  void WaitUntilEmpty();
 
  FML_DISALLOW_COPY_AND_ASSIGN(FenceWaiterVK);
};
 
}  // namespace impeller