i_system.h

// SONIC ROBO BLAST 2
//-----------------------------------------------------------------------------
// Copyright (C) 1993-1996 by id Software, Inc.
// Copyright (C) 1998-2000 by DooM Legacy Team.
// Copyright (C) 1999-2014 by Sonic Team Junior.
//
// This program is free software distributed under the
// terms of the GNU General Public License, version 2.
// See the 'LICENSE' file for more details.
//-----------------------------------------------------------------------------
/// \file  i_system.h
/// \brief System specific interface stuff.

#ifndef __I_SYSTEM__
#define __I_SYSTEM__

#include "d_ticcmd.h"
#include "d_event.h"

#ifdef __GNUG__
#pragma interface
#endif

/**	\brief max quit functions
*/
#define MAX_QUIT_FUNCS     16


/**	\brief Graphic system had started up
*/
extern UINT8 graphics_started;

/**	\brief Keyboard system is up and run
*/
extern UINT8 keyboard_started;

/**	\brief	The I_GetFreeMem function

	\param	total	total memory in the system

	\return	free memory in the system
*/
UINT32 I_GetFreeMem(UINT32 *total);

/**	\brief  Called by D_SRB2Loop, returns current time in tics.
*/
tic_t I_GetTime(void);

/**	\brief	The I_Sleep function

	\return	void
*/
void I_Sleep(void);

/**	\brief Get events

	Called by D_SRB2Loop,
	called before processing each tic in a frame.
	Quick syncronous operations are performed here.
	Can call D_PostEvent.
*/
void I_GetEvent(void);

/**	\brief Asynchronous interrupt functions should maintain private queues
	that are read by the synchronous functions
	to be converted into events.
*/
void I_OsPolling(void);

// Either returns a null ticcmd,