ahb_swapchain_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.
 
#ifndef FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SWAPCHAIN_AHB_AHB_SWAPCHAIN_VK_H_
#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SWAPCHAIN_AHB_AHB_SWAPCHAIN_VK_H_
 
#include "impeller/renderer/backend/vulkan/swapchain/ahb/ahb_swapchain_impl_vk.h"
#include "impeller/renderer/backend/vulkan/swapchain/swapchain_vk.h"
#include "impeller/toolkit/android/native_window.h"
#include "impeller/toolkit/android/surface_control.h"
 
namespace impeller {
 
//------------------------------------------------------------------------------
/// @brief      The implementation of a swapchain that uses hardware buffers
///             presented to a given surface control on Android.
///
/// @warning    This swapchain implementation is not available on all Android
///             versions supported by Flutter. Perform the
///             `IsAvailableOnPlatform` check and fallback to KHR swapchains if
///             this type of swapchain cannot be created. The available building
///             blocks for these kinds of swapchains are only available on
///             Android API levels >= 29.
///
class AHBSwapchainVK final : public SwapchainVK {
 public:
  static bool IsAvailableOnPlatform();
 
  // |SwapchainVK|
  ~AHBSwapchainVK() override;
 
  AHBSwapchainVK(const AHBSwapchainVK&) = delete;
 
  AHBSwapchainVK& operator=(const AHBSwapchainVK&) = delete;
 
  // |SwapchainVK|
  bool IsValid() const override;
 
  // |SwapchainVK|
  std::unique_ptr<Surface> AcquireNextDrawable() override;
 
  // |SwapchainVK|
  vk::Format GetSurfaceFormat() const override;
 
  // |SwapchainVK|
  void UpdateSurfaceSize(const ISize& size) override;
 
 private:
  friend class SwapchainVK;
 
  std::weak_ptr<Context> context_;
  std::shared_ptr<android::SurfaceControl> surface_control_;
  const bool enable_msaa_;
  size_t swapchain_image_count_ = 3u;
  std::shared_ptr<AHBSwapchainImplVK> impl_;
 
  explicit AHBSwapchainVK(const std::shared_ptr<Context>& context,
                          ANativeWindow* window,
                          const vk::UniqueSurfaceKHR& surface,
                          const ISize& size,
                          bool enable_msaa);
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SWAPCHAIN_AHB_AHB_SWAPCHAIN_VK_H_