descriptor_pool_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 <optional>
#include <queue>
 
#include "flutter/fml/macros.h"
#include "impeller/renderer/backend/vulkan/device_holder.h"
#include "impeller/renderer/backend/vulkan/vk.h"
 
namespace impeller {
 
//------------------------------------------------------------------------------
/// @brief      A short-lived dynamically-sized descriptor pool. Descriptors
///             from this pool don't need to be freed individually. Instead, the
///             pool must be collected after all the descriptors allocated from
///             it are done being used.
///
///             The pool or it's descriptors may not be accessed from multiple
///             threads.
///
///             Encoders create pools as necessary as they have the same
///             threading and lifecycle restrictions.
///
class DescriptorPoolVK {
 public:
  explicit DescriptorPoolVK(
      const std::weak_ptr<const DeviceHolder>& device_holder);
 
  ~DescriptorPoolVK();
 
  std::optional<vk::DescriptorSet> AllocateDescriptorSet(
      const vk::DescriptorSetLayout& layout,
      size_t command_count);
 
 private:
  std::optional<vk::DescriptorSet> AllocateDescriptorSet(
      const vk::DescriptorSetLayout& layout);
 
  std::weak_ptr<const DeviceHolder> device_holder_;
  uint32_t pool_size_ = 31u;
  std::queue<vk::UniqueDescriptorPool> pools_;
 
  std::optional<vk::DescriptorPool> GetDescriptorPool();
 
  bool GrowPool();
 
  FML_DISALLOW_COPY_AND_ASSIGN(DescriptorPoolVK);
};
 
}  // namespace impeller