render_target_cache.cc

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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.
 
#include "impeller/entity/render_target_cache.h"
#include "impeller/renderer/render_target.h"
 
namespace impeller {
 
RenderTargetCache::RenderTargetCache(std::shared_ptr<Allocator> allocator)
    : RenderTargetAllocator(std::move(allocator)) {}
 
void RenderTargetCache::Start() {
  for (auto& td : texture_data_) {
    td.used_this_frame = false;
  }
}
 
void RenderTargetCache::End() {
  std::vector<TextureData> retain;
 
  for (const auto& td : texture_data_) {
    if (td.used_this_frame) {
      retain.push_back(td);
    }
  }
  texture_data_.swap(retain);
}
 
size_t RenderTargetCache::CachedTextureCount() const {
  return texture_data_.size();
}
 
std::shared_ptr<Texture> RenderTargetCache::CreateTexture(
    const TextureDescriptor& desc) {
  FML_DCHECK(desc.storage_mode != StorageMode::kHostVisible);
  FML_DCHECK(desc.usage &
             static_cast<TextureUsageMask>(TextureUsage::kRenderTarget));
 
  for (auto& td : texture_data_) {
    const auto other_desc = td.texture->GetTextureDescriptor();
    FML_DCHECK(td.texture != nullptr);
    if (!td.used_this_frame && desc == other_desc) {
      td.used_this_frame = true;
      return td.texture;
    }
  }
  auto result = RenderTargetAllocator::CreateTexture(desc);
  if (result == nullptr) {
    return result;
  }
  texture_data_.push_back(
      TextureData{.used_this_frame = true, .texture = result});
  return result;
}
 
}  // namespace impeller