render_target_cache.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_ENTITY_RENDER_TARGET_CACHE_H_
#define FLUTTER_IMPELLER_ENTITY_RENDER_TARGET_CACHE_H_
 
#include "impeller/renderer/render_target.h"
 
namespace impeller {
 
/// @brief An implementation of the [RenderTargetAllocator] that caches all
///        allocated texture data for one frame.
///
///        Any textures unused after a frame are immediately discarded.
class RenderTargetCache : public RenderTargetAllocator {
 public:
  explicit RenderTargetCache(std::shared_ptr<Allocator> allocator);
 
  ~RenderTargetCache() = default;
 
  // |RenderTargetAllocator|
  void Start() override;
 
  // |RenderTargetAllocator|
  void End() override;
 
  // |RenderTargetAllocator|
  std::shared_ptr<Texture> CreateTexture(
      const TextureDescriptor& desc) override;
 
  // visible for testing.
  size_t CachedTextureCount() const;
 
 private:
  struct TextureData {
    bool used_this_frame;
    std::shared_ptr<Texture> texture;
  };
 
  std::vector<TextureData> texture_data_;
 
  RenderTargetCache(const RenderTargetCache&) = delete;
 
  RenderTargetCache& operator=(const RenderTargetCache&) = delete;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_ENTITY_RENDER_TARGET_CACHE_H_