/**
 ******************************************************************************
 * Xenia : Xbox 360 Emulator Research Project                                 *
 ******************************************************************************
 * Copyright 2014 Ben Vanik. All rights reserved.                             *
 * Released under the BSD license - see LICENSE in the root for more details. *
 ******************************************************************************
 */

#ifndef XENIA_GPU_COMMAND_PROCESSOR_H_
#define XENIA_GPU_COMMAND_PROCESSOR_H_

#include <xenia/common.h>
#include <xenia/gpu/draw_command.h>
#include <xenia/gpu/register_file.h>
#include <xenia/gpu/xenos/xenos.h>

namespace xe {
namespace gpu {

class GraphicsDriver;
class GraphicsSystem;

class CommandProcessor {
public:
  CommandProcessor(GraphicsSystem* graphics_system, Memory* memory);
  virtual ~CommandProcessor();

  Memory* memory() const { return memory_; }

  uint64_t QueryTime();
  uint32_t counter() const { return counter_; }
  void increment_counter() { counter_++; }

  void Initialize(GraphicsDriver* driver, uint32_t ptr, uint32_t page_count);
  void EnableReadPointerWriteBack(uint32_t ptr, uint32_t block_size);

  void UpdateWritePointer(uint32_t value);

  void Pump();

private:
  typedef struct {
    uint32_t ptr;
    uint32_t base_ptr;
    uint32_t max_address;
    uint32_t ptr_mask;
  } PacketArgs;

  void AdvancePtr(PacketArgs& args, uint32_t n);
  void ExecutePrimaryBuffer(uint32_t start_index, uint32_t end_index);
  void ExecuteIndirectBuffer(uint32_t ptr, uint32_t length);
  uint32_t ExecutePacket(PacketArgs& args);
  void WriteRegister(uint32_t packet_ptr, uint32_t index, uint32_t value);
  void MakeCoherent();

  Memory*           memory_;
  GraphicsSystem*   graphics_system_;
  GraphicsDriver*   driver_;

  uint64_t          time_base_;
  uint32_t          counter_;

  uint32_t          primary_buffer_ptr_;
  uint32_t          primary_buffer_size_;

  uint32_t          read_ptr_index_;
  uint32_t          read_ptr_update_freq_;
  uint32_t          read_ptr_writeback_ptr_;

  HANDLE            write_ptr_index_event_;
  volatile uint32_t write_ptr_index_;
  volatile uint32_t write_ptr_max_index_;

  DrawCommand       draw_command_;
};

}  // namespace gpu
}  // namespace xe

#endif  // XENIA_GPU_COMMAND_PROCESSOR_H_