impeller/renderer/render_target.h

// 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.

#pragma once

#include <functional>
#include <map>
#include <optional>

#include "flutter/fml/macros.h"
#include "impeller/geometry/size.h"
#include "impeller/renderer/formats.h"

namespace impeller {

class Context;

class RenderTarget {
 public:
  static RenderTarget CreateOffscreen(const Context& context,
                                      ISize size,
                                      std::string label = "Offscreen");

  static RenderTarget CreateMSAA(const Context& context,
                                 std::shared_ptr<Texture> resolve_texture,
                                 std::string label = "Offscreen");

  RenderTarget();

  ~RenderTarget();

  bool IsValid() const;

  SampleCount GetSampleCount() const;

  bool HasColorAttachment(size_t index) const;

  ISize GetRenderTargetSize() const;

  std::shared_ptr<Texture> GetRenderTargetTexture() const;

  std::optional<ISize> GetColorAttachmentSize(size_t index) const;

  RenderTarget& SetColorAttachment(ColorAttachment attachment, size_t index);

  RenderTarget& SetDepthAttachment(DepthAttachment attachment);

  RenderTarget& SetStencilAttachment(StencilAttachment attachment);

  const std::map<size_t, ColorAttachment>& GetColorAttachments() const;

  const std::optional<DepthAttachment>& GetDepthAttachment() const;

  const std::optional<StencilAttachment>& GetStencilAttachment() const;

 private:
  std::map<size_t, ColorAttachment> colors_;
  std::optional<DepthAttachment> depth_;
  std::optional<StencilAttachment> stencil_;

  void IterateAllAttachments(
      std::function<bool(const Attachment& attachment)> iterator) const;
};

}  // namespace impeller