texture_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_TEXTURE_MTL_H_
#define FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_TEXTURE_MTL_H_
 
#include <Metal/Metal.h>
 
#include "flutter/fml/macros.h"
#include "impeller/base/backend_cast.h"
#include "impeller/core/texture.h"
 
namespace impeller {
 
class TextureMTL final : public Texture,
                         public BackendCast<TextureMTL, Texture> {
 public:
  /// @brief This callback needs to always return the same texture when called
  ///        multiple times.
  using AcquireTextureProc = std::function<id<MTLTexture>()>;
 
  TextureMTL(TextureDescriptor desc,
             const AcquireTextureProc& aquire_proc,
             bool wrapped = false,
             bool drawable = false);
 
  static std::shared_ptr<TextureMTL> Wrapper(
      TextureDescriptor desc,
      id<MTLTexture> texture,
      std::function<void()> deletion_proc = nullptr);
 
  static std::shared_ptr<TextureMTL> Create(TextureDescriptor desc,
                                            id<MTLTexture> texture);
 
  // |Texture|
  ~TextureMTL() override;
 
  id<MTLTexture> GetMTLTexture() const;
 
  bool IsWrapped() const;
 
  /// @brief Whether or not this texture is wrapping a Metal drawable.
  bool IsDrawable() const;
 
  // |Texture|
  bool IsValid() const override;
 
  bool GenerateMipmap(id<MTLBlitCommandEncoder> encoder);
 
 private:
  AcquireTextureProc aquire_proc_ = {};
  bool is_valid_ = false;
  bool is_wrapped_ = false;
  bool is_drawable_ = false;
 
  // |Texture|
  void SetLabel(std::string_view label) override;
 
  // |Texture|
  bool OnSetContents(const uint8_t* contents,
                     size_t length,
                     size_t slice) override;
 
  // |Texture|
  bool OnSetContents(std::shared_ptr<const fml::Mapping> mapping,
                     size_t slice) override;
  // |Texture|
  ISize GetSize() const override;
 
  TextureMTL(const TextureMTL&) = delete;
 
  TextureMTL& operator=(const TextureMTL&) = delete;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_RENDERER_BACKEND_METAL_TEXTURE_MTL_H_