surface_context_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_SURFACE_CONTEXT_VK_H_
#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SURFACE_CONTEXT_VK_H_
 
#include <memory>
 
#include "impeller/base/backend_cast.h"
#include "impeller/renderer/backend/vulkan/vk.h"
#include "impeller/renderer/command_queue.h"
#include "impeller/renderer/context.h"
 
namespace impeller {
 
class ContextVK;
class Surface;
class SwapchainVK;
 
/// For Vulkan, there is both a ContextVK that implements Context and a
/// SurfaceContextVK that also implements Context and takes a ContextVK as its
/// parent. There is a one to many relationship between ContextVK and
/// SurfaceContextVK.
///
/// Most operations in this class are delegated to the parent ContextVK.
/// This class specifically manages swapchains and creation of VkSurfaces on
/// Android. By maintaining the swapchain this way, it is possible to have
/// multiple surfaces sharing the same ContextVK without stepping on each
/// other's swapchains.
class SurfaceContextVK : public Context,
                         public BackendCast<SurfaceContextVK, Context> {
 public:
  explicit SurfaceContextVK(const std::shared_ptr<ContextVK>& parent);
 
  // |Context|
  ~SurfaceContextVK() override;
 
  // |Context|
  BackendType GetBackendType() const override;
 
  // |Context|
  std::string DescribeGpuModel() const override;
 
  // |Context|
  bool IsValid() const override;
 
  // |Context|
  std::shared_ptr<Allocator> GetResourceAllocator() const override;
 
  // |Context|
  std::shared_ptr<ShaderLibrary> GetShaderLibrary() const override;
 
  // |Context|
  std::shared_ptr<SamplerLibrary> GetSamplerLibrary() const override;
 
  // |Context|
  std::shared_ptr<PipelineLibrary> GetPipelineLibrary() const override;
 
  // |Context|
  std::shared_ptr<CommandBuffer> CreateCommandBuffer() const override;
 
  // |Context|
  const std::shared_ptr<const Capabilities>& GetCapabilities() const override;
 
  // |Context|
  std::shared_ptr<CommandQueue> GetCommandQueue() const override;
 
  // |Context|
  void Shutdown() override;
 
  [[nodiscard]] bool SetWindowSurface(vk::UniqueSurfaceKHR surface,
                                      const ISize& size);
 
  [[nodiscard]] bool SetSwapchain(std::shared_ptr<SwapchainVK> swapchain);
 
  std::unique_ptr<Surface> AcquireNextSurface();
 
  /// @brief Mark the current swapchain configuration as dirty, forcing it to be
  ///        recreated on the next frame.
  void UpdateSurfaceSize(const ISize& size) const;
 
  void InitializeCommonlyUsedShadersIfNeeded() const override;
 
  const vk::Device& GetDevice() const;
 
  const std::shared_ptr<ContextVK>& GetParent() const;
 
 private:
  std::shared_ptr<ContextVK> parent_;
  std::shared_ptr<SwapchainVK> swapchain_;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SURFACE_CONTEXT_VK_H_