// Copyright (c) 2012 The Chromium 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 GPU_IPC_GL_IN_PROCESS_CONTEXT_H_
#define GPU_IPC_GL_IN_PROCESS_CONTEXT_H_

#include <memory>

#include "base/single_thread_task_runner.h"
#include "gpu/command_buffer/common/context_creation_attribs.h"
#include "gpu/ipc/command_buffer_task_executor.h"
#include "gpu/ipc/gl_in_process_context_export.h"
#include "gpu/ipc/in_process_command_buffer.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/gl/gl_surface.h"

namespace gpu {
class SharedImageInterface;
class TransferBuffer;
struct GpuFeatureInfo;
struct SharedMemoryLimits;

namespace gles2 {
class GLES2CmdHelper;
class GLES2Implementation;
}

// Wraps everything needed to use an in process GL context.
class GL_IN_PROCESS_CONTEXT_EXPORT GLInProcessContext {
 public:
  // You must call Initialize() before using the context.
  GLInProcessContext();
  ~GLInProcessContext();

  // Initialize the GLInProcessContext, if |is_offscreen| is true, renders to an
  // offscreen context. |attrib_list| must be null or a NONE-terminated list
  // of attribute/value pairs.
  // If |surface| is not null, then it must match |is_offscreen|,
  // |window| must be gfx::kNullAcceleratedWidget, and the command buffer
  // service must run on the same thread as this client because GLSurface is
  // not thread safe. If |surface| is null, then the other parameters are used
  // to correctly create a surface.
  // |gpu_channel_manager| should be non-null when used in the GPU process.
  ContextResult Initialize(
      scoped_refptr<CommandBufferTaskExecutor> task_executor,
      scoped_refptr<gl::GLSurface> surface,
      bool is_offscreen,
      SurfaceHandle window,
      const ContextCreationAttribs& attribs,
      const SharedMemoryLimits& memory_limits,
      GpuMemoryBufferManager* gpu_memory_buffer_manager,
      ImageFactory* image_factory,
      GpuChannelManagerDelegate* gpu_channel_manager_delegate,
      scoped_refptr<base::SingleThreadTaskRunner> task_runner);

  const Capabilities& GetCapabilities() const;
  const GpuFeatureInfo& GetGpuFeatureInfo() const;

  // Allows direct access to the GLES2 implementation so a GLInProcessContext
  // can be used without making it current.
  gles2::GLES2Implementation* GetImplementation();

  CommandBuffer* GetCommandBuffer();

  SharedImageInterface* GetSharedImageInterface();

  void SetUpdateVSyncParametersCallback(
      const InProcessCommandBuffer::UpdateVSyncParametersCallback& callback);

 private:
  // The destruction order is important, don't reorder these member variables.
  std::unique_ptr<InProcessCommandBuffer> command_buffer_;
  std::unique_ptr<gles2::GLES2CmdHelper> gles2_helper_;
  std::unique_ptr<TransferBuffer> transfer_buffer_;
  std::unique_ptr<gles2::GLES2Implementation> gles2_implementation_;

  DISALLOW_COPY_AND_ASSIGN(GLInProcessContext);
};

}  // namespace gpu

#endif  // GPU_IPC_GL_IN_PROCESS_CONTEXT_H_