cl_demo.c

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

*/

#include "quakedef.h"

int		stufftext_frame;

static void CL_FinishTimeDemo (void);
/* vars for the mission pack intro */
qboolean	intro_playing = false;

/* these should have been used for
 * recording the mission pack intro
 */
//qboolean	skip_start = false;
//int		num_intro_msg = 0;


/*
==============================================================================

DEMO CODE

When a demo is playing back, all NET_SendMessages are skipped, and
NET_GetMessages are read from the demo file.

Whenever cl.time gets past the last received message, another message is
read from the demo file.
==============================================================================
*/

/*
==============
CL_StopPlayback

Called when a demo file runs out, or the user starts a game
==============
*/
void CL_StopPlayback (void)
{
	if (!cls.demoplayback)
		return;

	if (intro_playing)
		M_ToggleMenu_f();

	intro_playing = false;
//	num_intro_msg = 0;

	fclose (cls.demofile);
	cls.demoplayback = false;
	cls.demofile = NULL;
	cls.state = ca_disconnected;

	if (cls.timedemo)
		CL_FinishTimeDemo ();
}

/*
====================
CL_WriteDemoMessage

Dumps the current net message, prefixed by the length and view angles
====================
*/
static void CL_WriteDemoMessage (void)
{
	int		len;
	int		i;
	float	f;

	if (!cls.demorecording)
		return;

	len = LittleLong (net_message->message->cursize);
	fwrite (&len, 4, 1, cls.demofile);
//	fwrite (&len, 4, 1, cls.introdemofile);
	for (i = 0; i < 3; i++)
	{
		f = LittleFloat (cl.viewangles[i]);
		fwrite (&f, 4, 1, cls.demofile);
//		fwrite (&f, 4, 1, cls.introdemofile);
	}
	fwrite (net_message->message->data, net_message->message->cursize, 1, cls.demofile);
	fflush (cls.demofile);
//	fwrite (net_message.data, net_message.cursize, 1, cls.introdemofile);
//	fflush (cls.introdemofile);
}


/*
====================
CL_GetMessage

Handles recording and playback of demos, on top of NET_ code
====================
*/
int CL_GetMessage (void)
{
	int		r, i;
	float	f;

	if (cl.paused & 2)
		return 0;
	if (cls.demoplayback)
	{
	
	// decide if it is time to grab the next message		
		if (cls.signon == SIGNONS)	// always grab until fully connected
		{
		// Always wait for full frame update on stuff messages.
		// If the server stuffs a reconnect, we must wait for
		// the client to re-initialize before accepting further
		// messages. Otherwise demo playback may freeze. Pa3PyX
		if (stufftext_frame == host_framecount)
			return 0;

			if (cls.timedemo)
			{
				if (host_framecount == cls.td_lastframe)
					return 0;		// already read this frame's message
				cls.td_lastframe = host_framecount;
			// if this is the second frame, grab the real td_starttime
			// so the bogus time on the first frame doesn't count
				if (host_framecount == cls.td_startframe + 1)
					cls.td_starttime = realtime;
			}
			else if (/* cl.time > 0 && */ cl.time <= cl.mtime[0])
			{
					return 0;		// don't need another message yet
			}
		}
		

	// get the next message
			fread (&net_message->message->cursize, 4, 1, cls.demofile);

			VectorCopy (cl.mviewangles[0], cl.mviewangles[1]);
			for (i = 0 ; i < 3 ; i++)
			{
				r = fread (&f, 4, 1, cls.demofile);
				cl.mviewangles[0][i] = LittleFloat (f);
			}
			
			net_message->message->cursize = LittleLong (net_message->message->cursize);

			if (net_message->message->cursize > MAX_MSGLEN)
				Sys_Error ("Demo message > MAX_MSGLEN");
			r = fread (net_message->message->data, net_message->message->cursize, 1, cls.demofile);
			if (r != 1)
			{
				CL_StopPlayback ();
				return 0;
			}


		return 1;
	}

	while (1)
	{
		r = NET_GetMessage (cls.netcon);
		
		if (r != 1 && r != 2)
			return r;
	
	// discard nop keepalive message
		if (net_message->message->cursize == 1 && net_message->message->data[0] == svc_nop)
			Con_Printf ("<-- server to client keepalive\n");
		else
			break;
	}

	if (cls.demorecording)
		CL_WriteDemoMessage ();
	
	return r;
}


/*
====================
CL_Stop_f

stop recording a demo
====================
*/
void CL_Stop_f (void)
{
	if (cmd_source != src_command)
		return;

	if (!cls.demorecording)
	{
		Con_Printf ("Not recording a demo.\n");
		return;
	}

	intro_playing = false;
//	num_intro_msg = 0;
// write a disconnect message to the demo file
	SZ_Clear (net_message->message);
	MSG_WriteByte (net_message->message, svc_disconnect);
	CL_WriteDemoMessage ();

// finish up
//	fclose (cls.introdemofile);
//	cls.introdemofile = NULL;
	fclose (cls.demofile);
	cls.demofile = NULL;
	cls.demorecording = false;
	Con_Printf ("Completed demo\n");
}

/*
====================
CL_Record_f

record <demoname> <map> [cd track]
====================
*/
void CL_Record_f (void)
{
	int		c;
	char	name[MAX_OSPATH];
	const char	*p;
	int		track;

	if (cmd_source != src_command)
		return;

	if (cls.demorecording)
		CL_Stop_f();

	c = Cmd_Argc();
	if (c != 2 && c != 3 && c != 4)
	{
		Con_Printf ("record <demoname> [<map> [cd track]]\n");
		return;
	}

	p = Cmd_Argv(1);
	if (*p == '.' || strstr(p, ".."))
	{
		Con_Printf ("Invalid demo name.\n");
		return;
	}
	while (*p)
	{
		if (*p == '.' || isalnum(*p))
		{
			p++;
			continue;
		}
		Con_Printf ("Invalid demo name.\n");
		return;
	}

	if (c == 2 && cls.state == ca_connected)
	{
		Con_Printf("Can not record - already connected to server\nClient demo recording must be started before connecting\n");
		return;
	}

// write the forced cd track number, or -1
	if (c == 4)
	{
		track = atoi(Cmd_Argv(3));
		Con_Printf ("Forcing CD track to %i\n", cls.forcetrack);
	}
	else
	{
		track = -1;	
	}

	sprintf (name, "%s/%s", com_gamedir, Cmd_Argv(1));
	
//
// start the map up
//
	if (c > 2)
		Cmd_ExecuteString ( va("map %s", Cmd_Argv(2)), src_command);
	
//
// open the demo file
//
	COM_DefaultExtension (name, ".dem");

	Con_Printf ("recording to %s.\n", name);
	cls.demofile = fopen (name, "wb");
	if (!cls.demofile)
	{
		Con_Printf ("ERROR: couldn't create %s\n", name);
		return;
	}

	cls.forcetrack = track;
	fprintf (cls.demofile, "%i\n", cls.forcetrack);
	
	cls.demorecording = true;
}


/*
====================
CL_PlayDemo_f

play [demoname]
====================
*/
void CL_PlayDemo_f (void)
{
	char	name[MAX_OSPATH];

	if (cmd_source != src_command)
		return;

	if (Cmd_Argc() != 2)
	{
		Con_Printf ("playdemo <demoname> : plays a demo\n");
		return;
	}

// get rid of the menu and/or console
	key_dest = key_game;

//
// disconnect from server
//
	CL_Disconnect ();
	
//
// open the demo file
//
	strcpy (name, Cmd_Argv(1));

	intro_playing = false;
	if (portals)
	{
	/* the mission pack specific intro is actually
	 * a pre-recorded demo named t9.dem, which is
	 * plain crap, because it reserves an ordinary
	 * name for a special purpose...
	 */
		if(!stricmp(name,"t9"))
		{
			intro_playing = true;
//			skip_start = true;
		}
	}

	COM_DefaultExtension (name, ".dem");

	Con_Printf ("Playing demo from %s.\n", name);
	/*
	if (intro_playing)
	{
		cls.demorecording = true;
		cls.introdemofile = fopen("t9.dem","wb");
	}
	*/

	COM_FOpenFile (name, &cls.demofile, NULL);
	if (!cls.demofile)
	{
		Con_Printf ("ERROR: couldn't open %s\n", name);
		cls.demonum = -1;		// stop demo loop
		return;
	}

	cls.demoplayback = true;
	cls.state = ca_connected;
	fscanf (cls.demofile, "%i\n", &cls.forcetrack);

// Get a new message on playback start.
// Moved from CL_TimeDemo_f to here, Pa3PyX.
	cls.td_lastframe = -1;
}

/*
====================
CL_FinishTimeDemo

====================
*/
static void CL_FinishTimeDemo (void)
{
	int		frames;
	float	time;
	
	cls.timedemo = false;
	
// the first frame didn't count
	frames = (host_framecount - cls.td_startframe) - 1;
	time = realtime - cls.td_starttime;
	if (!time)
		time = 1;
	Con_Printf ("%i frames %5.1f seconds %5.1f fps\n", frames, time, frames/time);
}

/*
====================
CL_TimeDemo_f

timedemo [demoname]
====================
*/
void CL_TimeDemo_f (void)
{
	if (cmd_source != src_command)
		return;

	if (Cmd_Argc() != 2)
	{
		Con_Printf ("timedemo <demoname> : gets demo speeds\n");
		return;
	}

	CL_PlayDemo_f ();
	
// cls.td_starttime will be grabbed at the second frame of the demo, so
// all the loading time doesn't get counted
	
	cls.timedemo = true;
	cls.td_startframe = host_framecount;
//	cls.td_lastframe = -1;	// get a new message this frame
				// Moved to CL_PlayDemo_f(), Pa3PyX.
}