// Copyright 2015 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef COBALT_RENDERER_BACKEND_GRAPHICS_SYSTEM_H_
#define COBALT_RENDERER_BACKEND_GRAPHICS_SYSTEM_H_

#include <memory>

#include "base/memory/ref_counted.h"
#include "cobalt/renderer/backend/display.h"
#include "cobalt/renderer/backend/graphics_context.h"
#include "cobalt/renderer/backend/render_target.h"
#include "cobalt/system_window/system_window.h"

namespace cobalt {
namespace renderer {
namespace backend {

// The GraphicsSystem is the entry point for the Cobalt graphics API.
// The first step for doing any graphics-related activity on a Cobalt platform
// is to construct a GraphicsSystem object, which acts not only as a factory
// for other graphics system objects the user may wish to create, but also as a
// central home for any platform-specific global support objects.
// Typically a GraphicsSystem will be constructed via a call to
// CreateDefaultGraphicsSystem() which should be implemented on every Cobalt
// platform, even if it simply returns a GraphicsSystemNull object.
// Most often, there will be one GraphicsSystem per platform.
class GraphicsSystem {
 public:
  virtual ~GraphicsSystem() {}

  // Creates a display associated with a window.
  virtual std::unique_ptr<Display> CreateDisplay(
      system_window::SystemWindow* system_window) = 0;

  // Creates a graphics context that can be used to issue graphics commands to
  // the hardware.
  virtual std::unique_ptr<GraphicsContext> CreateGraphicsContext() = 0;
};

}  // namespace backend
}  // namespace renderer
}  // namespace cobalt

#endif  // COBALT_RENDERER_BACKEND_GRAPHICS_SYSTEM_H_