/*
	msg.c

	(description)

	Copyright (C) 1996-1997  Id Software, Inc.

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

	See the GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

static __attribute__ ((used)) const char rcsid[] = 
	"$Id$";

#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif

#include "QF/msg.h"
#include "QF/qendian.h"
#include "QF/sys.h"

#include "qw/msg_ucmd.h"
#include "qw/protocol.h"

struct usercmd_s nullcmd;

void
MSG_WriteDeltaUsercmd (sizebuf_t *buf, usercmd_t *from, usercmd_t *cmd)
{
	int         bits;

	// send the movement message
	bits = 0;
	if (cmd->angles[0] != from->angles[0])
		bits |= CM_ANGLE1;
	if (cmd->angles[1] != from->angles[1])
		bits |= CM_ANGLE2;
	if (cmd->angles[2] != from->angles[2])
		bits |= CM_ANGLE3;
	if (cmd->forwardmove != from->forwardmove)
		bits |= CM_FORWARD;
	if (cmd->sidemove != from->sidemove)
		bits |= CM_SIDE;
	if (cmd->upmove != from->upmove)
		bits |= CM_UP;
	if (cmd->buttons != from->buttons)
		bits |= CM_BUTTONS;
	if (cmd->impulse != from->impulse)
		bits |= CM_IMPULSE;
	MSG_WriteByte (buf, bits);

	if (bits & CM_ANGLE1)
		MSG_WriteAngle16 (buf, cmd->angles[0]);
	if (bits & CM_ANGLE2)
		MSG_WriteAngle16 (buf, cmd->angles[1]);
	if (bits & CM_ANGLE3)
		MSG_WriteAngle16 (buf, cmd->angles[2]);

	if (bits & CM_FORWARD)
		MSG_WriteShort (buf, cmd->forwardmove);
	if (bits & CM_SIDE)
		MSG_WriteShort (buf, cmd->sidemove);
	if (bits & CM_UP)
		MSG_WriteShort (buf, cmd->upmove);

	if (bits & CM_BUTTONS)
		MSG_WriteByte (buf, cmd->buttons);
	if (bits & CM_IMPULSE)
		MSG_WriteByte (buf, cmd->impulse);
	MSG_WriteByte (buf, cmd->msec);
}

void
MSG_ReadDeltaUsercmd (qmsg_t *msg, usercmd_t *from, usercmd_t *move)
{
	int         bits;

	memcpy (move, from, sizeof (*move));

	bits = MSG_ReadByte (msg);

	// read current angles
	if (bits & CM_ANGLE1)
		move->angles[0] = MSG_ReadAngle16 (msg);
	if (bits & CM_ANGLE2)
		move->angles[1] = MSG_ReadAngle16 (msg);
	if (bits & CM_ANGLE3)
		move->angles[2] = MSG_ReadAngle16 (msg);

	// read movement
	if (bits & CM_FORWARD)
		move->forwardmove = MSG_ReadShort (msg);
	if (bits & CM_SIDE)
		move->sidemove = MSG_ReadShort (msg);
	if (bits & CM_UP)
		move->upmove = MSG_ReadShort (msg);

	// read buttons
	if (bits & CM_BUTTONS)
		move->buttons = MSG_ReadByte (msg);

	if (bits & CM_IMPULSE)
		move->impulse = MSG_ReadByte (msg);

	// read time to run command
	move->msec = MSG_ReadByte (msg);
}