swapchain_transients_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_SWAPCHAIN_TRANSIENTS_VK_H_
#define FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SWAPCHAIN_SWAPCHAIN_TRANSIENTS_VK_H_
 
#include "impeller/core/texture.h"
#include "impeller/core/texture_descriptor.h"
#include "impeller/renderer/context.h"
 
namespace impeller {
 
//------------------------------------------------------------------------------
/// @brief      Resources, meant to be memoized by the texture descriptor of the
///             wrapped swapchain images, that are intuitively cheap to create
///             but have been observed to be time consuming to construct on some
///             Vulkan drivers. This includes the device-transient MSAA and
///             depth-stencil textures.
///
///             The same textures are used for all swapchain images.
///
class SwapchainTransientsVK {
 public:
  explicit SwapchainTransientsVK(std::weak_ptr<Context> context,
                                 TextureDescriptor desc,
                                 bool enable_msaa);
 
  ~SwapchainTransientsVK();
 
  SwapchainTransientsVK(const SwapchainTransientsVK&) = delete;
 
  SwapchainTransientsVK& operator=(const SwapchainTransientsVK&) = delete;
 
  const std::weak_ptr<Context>& GetContext() const;
 
  bool IsMSAAEnabled() const;
 
  const std::shared_ptr<Texture>& GetMSAATexture();
 
  const std::shared_ptr<Texture>& GetDepthStencilTexture();
 
 private:
  std::weak_ptr<Context> context_;
  const TextureDescriptor desc_;
  const bool enable_msaa_;
  std::shared_ptr<Texture> cached_msaa_texture_;
  std::shared_ptr<Texture> cached_depth_stencil_;
 
  std::shared_ptr<Texture> CreateMSAATexture() const;
 
  std::shared_ptr<Texture> CreateDepthStencilTexture() const;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_VULKAN_SWAPCHAIN_SWAPCHAIN_TRANSIENTS_VK_H_