device_buffer.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.
 
#pragma once
 
#include <memory>
#include <string>
 
#include "flutter/fml/macros.h"
#include "impeller/core/allocator.h"
#include "impeller/core/buffer.h"
#include "impeller/core/buffer_view.h"
#include "impeller/core/device_buffer_descriptor.h"
#include "impeller/core/range.h"
#include "impeller/core/texture.h"
 
namespace impeller {
 
class DeviceBuffer : public Buffer,
                     public std::enable_shared_from_this<DeviceBuffer> {
 public:
  virtual ~DeviceBuffer();
 
  [[nodiscard]] bool CopyHostBuffer(const uint8_t* source,
                                    Range source_range,
                                    size_t offset = 0u);
 
  virtual bool SetLabel(const std::string& label) = 0;
 
  virtual bool SetLabel(const std::string& label, Range range) = 0;
 
  BufferView AsBufferView() const;
 
  virtual std::shared_ptr<Texture> AsTexture(
      Allocator& allocator,
      const TextureDescriptor& descriptor,
      uint16_t row_bytes) const;
 
  // |Buffer|
  std::shared_ptr<const DeviceBuffer> GetDeviceBuffer(
      Allocator& allocator) const;
 
  const DeviceBufferDescriptor& GetDeviceBufferDescriptor() const;
 
  virtual uint8_t* OnGetContents() const = 0;
 
 protected:
  const DeviceBufferDescriptor desc_;
 
  explicit DeviceBuffer(DeviceBufferDescriptor desc);
 
  virtual bool OnCopyHostBuffer(const uint8_t* source,
                                Range source_range,
                                size_t offset) = 0;
 
 private:
  FML_DISALLOW_COPY_AND_ASSIGN(DeviceBuffer);
};
 
}  // namespace impeller