swapchain_transients_mtl.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_METAL_SWAPCHAIN_TRANSIENTS_MTL_H_
#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SWAPCHAIN_TRANSIENTS_MTL_H_
 
#include <memory>
 
#include "impeller/core/formats.h"
#include "impeller/geometry/rect.h"
#include "impeller/geometry/size.h"
#include "impeller/renderer/context.h"
#include "impeller/renderer/surface.h"
 
namespace impeller {
 
/// @brief A cache for the onscreen texture attachments used in surface_mtl.
///
/// Typically the onscreen resolve texture is created from a Metal drawable and
/// this cache is only used for the MSAA texture and the depth+stencil
/// attachment. When partial repaint is active, this class also provides a cache
/// for an offscreen resolve texture that is blitted to the real onscreen during
/// present.
class SwapchainTransientsMTL {
 public:
  explicit SwapchainTransientsMTL(const std::shared_ptr<Allocator>& allocator);
 
  ~SwapchainTransientsMTL();
 
  /// @brief Update the size and pixel format of the onscreens.
  ///
  /// Note: this will invalidate any cached textures if either property changes.
  void SetSizeAndFormat(ISize size, PixelFormat format);
 
  /// @brief Retrieve the resolve texture, creating one if needed.
  std::shared_ptr<Texture> GetResolveTexture();
 
  /// @brief Retrieve the MSAA texture, creating one if needed.
  std::shared_ptr<Texture> GetMSAATexture();
 
  /// @brief Retrieve the depth+stencil texture, creating one if needed.
  std::shared_ptr<Texture> GetDepthStencilTexture();
 
 private:
  std::shared_ptr<Allocator> allocator_;
  ISize size_ = {0, 0};
  PixelFormat format_ = PixelFormat::kUnknown;
  std::shared_ptr<Texture> resolve_tex_;
  std::shared_ptr<Texture> msaa_tex_;
  std::shared_ptr<Texture> depth_stencil_tex_;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_SWAPCHAIN_TRANSIENTS_MTL_H_