Throttle networking to 72 if host_maxfps is set any higher (or 0).

This means that you can just disable vsync and set host_maxfps to 0 for uncapped framerates without any new physics issues.
Note that this commit does not fix bf flashes.

Quake/cl_input.c

@@ -311,8 +311,6 @@ void CL_BaseMove (usercmd_t *cmd)
 	if (cls.signon != SIGNONS)
 		return;
 
-	CL_AdjustAngles ();
-
 	Q_memset (cmd, 0, sizeof(*cmd));
 
 	if (in_strafe.state & 1)

Quake/cl_main.c

@@ -67,6 +67,7 @@ int				cl_maxvisedicts;
 entity_t		**cl_visedicts;
 
 extern cvar_t	r_lerpmodels, r_lerpmove; //johnfitz
+extern float	host_netinterval;	//Spike
 
 void CL_ClearTrailStates(void)
 {
@@ -413,7 +414,7 @@ float	CL_LerpPoint (void)
 
 	f = cl.mtime[0] - cl.mtime[1];
 
-	if (!f || cls.timedemo || sv.active)
+	if (!f || cls.timedemo || (sv.active && !host_netinterval))
 	{
 		cl.time = cl.mtime[0];
 		return 1;
@@ -1119,6 +1120,25 @@ int CL_ReadFromServer (void)
 	return 0;
 }
 
+/*
+=================
+CL_UpdateViewAngles
+
+Spike: split from CL_SendCmd, to do clientside viewangle changes separately from outgoing packets.
+=================
+*/
+void CL_AccumulateCmd (void)
+{
+	if (cls.signon == SIGNONS)
+	{
+		//basic keyboard looking
+		CL_AdjustAngles ();
+
+		//accumulate movement from other devices
+		IN_Move (&cl.pendingcmd);
+	}
+}
+
 /*
 =================
 CL_SendCmd
@@ -1137,13 +1157,16 @@ void CL_SendCmd (void)
 		CL_BaseMove (&cmd);
 
 	// allow mice or other external controllers to add to the move
-		IN_Move (&cmd);
+		cmd.forwardmove	+= cl.pendingcmd.forwardmove;
+		cmd.sidemove	+= cl.pendingcmd.sidemove;
+		cmd.upmove		+= cl.pendingcmd.upmove;
 
 	// send the unreliable message
 		CL_SendMove (&cmd);
 	}
 	else
 		CL_SendMove (NULL);
+	memset(&cl.pendingcmd, 0, sizeof(cl.pendingcmd));
 
 	if (cls.demoplayback)
 	{

Quake/client.h

@@ -159,6 +159,7 @@ typedef struct
 								// doesn't accidentally do something the
 								// first frame
 	usercmd_t	cmd;			// last command sent to the server
+	usercmd_t	pendingcmd;		// accumulated state from mice+joysticks.
 
 // information for local display
 	int			stats[MAX_CL_STATS];	// health, etc
@@ -379,9 +380,11 @@ extern 	kbutton_t 	in_strafe;
 extern 	kbutton_t 	in_speed;
 
 void CL_InitInput (void);
+void CL_AccumulateCmd (void);
 void CL_SendCmd (void);
 void CL_SendMove (const usercmd_t *cmd);
 int  CL_ReadFromServer (void);
+void CL_AdjustAngles (void);
 void CL_BaseMove (usercmd_t *cmd);
 
 void CL_Download_Data(void);

Quake/cmd.c

@@ -149,9 +149,17 @@ void Cbuf_InsertText (const char *text)
 	}
 }
 
+//Spike: for renderer/server isolation
+void Cbuf_Waited(void)
+{
+	cmd_wait = false;
+}
+
 /*
 ============
 Cbuf_Execute
+
+Spike: reworked 'wait' for renderer/server rate independance
 ============
 */
 void Cbuf_Execute (void)
@@ -161,7 +169,7 @@ void Cbuf_Execute (void)
 	char	line[1024];
 	int		quotes, comment;
 
-	while (cmd_text.cursize)
+	while (cmd_text.cursize && !cmd_wait)
 	{
 // find a \n or ; line break
 		text = (char *)cmd_text.data;
@@ -206,13 +214,6 @@ void Cbuf_Execute (void)
 
 // execute the command line
 		Cmd_ExecuteString (line, src_command);
-
-		if (cmd_wait)
-		{	// skip out while text still remains in buffer, leaving it
-			// for next frame
-			cmd_wait = false;
-			break;
-		}
 	}
 }
 

Quake/cmd.h

@@ -58,6 +58,13 @@ void Cbuf_Execute (void);
 // Normally called once per frame, but may be explicitly invoked.
 // Do not call inside a command function!
 
+void Cbuf_Waited (void);
+//In vanilla, the 'wait' command is used by both input configs and servers.
+//mods do hacky stuff like syncing waits to StartFrame calls.
+//thankfully, c2s packets and server logic can both happen at the same intervals.
+//so wait sets a flag to inhibit execution of more commands, and we only clear it once we've run a network frame.
+//so this function lets the cbuf know when to clear the flag again (instead of part of cbuf_execute).
+
 //===========================================================================
 
 /*

Quake/host.c

@@ -56,7 +56,7 @@ client_t	*host_client;			// current client
 jmp_buf 	host_abortserver;
 
 byte		*host_colormap;
-
+float	host_netinterval;
 cvar_t	host_framerate = {"host_framerate","0",CVAR_NONE};	// set for slow motion
 cvar_t	host_speeds = {"host_speeds","0",CVAR_NONE};			// set for running times
 cvar_t	host_maxfps = {"host_maxfps", "72", CVAR_ARCHIVE}; //johnfitz
@@ -106,9 +106,22 @@ Max_Fps_f -- ericw
 */
 static void Max_Fps_f (cvar_t *var)
 {
+	if (var->value > 72 || var->value <= 0)
+	{
+		if (!host_netinterval)
+			Con_Printf ("Using renderer/network isolation.\n");
+		host_netinterval = 1.0/72;
+	}
+	else
+	{
+		if (host_netinterval)
+			Con_Printf ("Disabling renderer/network isolation.\n");
+		host_netinterval = 0;
+
 		if (var->value > 72)
 			Con_Warning ("host_maxfps above 72 breaks physics.\n");
 	}
+}
 
 /*
 ================
@@ -607,7 +620,7 @@ qboolean Host_FilterTime (float time)
 	else if (host_framerate.value > 0)
 		host_frametime = host_framerate.value;
 	else if (host_maxfps.value)// don't allow really long or short frames
-		host_frametime = CLAMP (0.001, host_frametime, 0.1); //johnfitz -- use CLAMP
+		host_frametime = CLAMP (0.0001, host_frametime, 0.1); //johnfitz -- use CLAMP
 
 	return true;
 }
@@ -697,8 +710,9 @@ Host_Frame
 Runs all active servers
 ==================
 */
-void _Host_Frame (float time)
+void _Host_Frame (double time)
 {
+	static double	accumtime = 0;
 	static double		time1 = 0;
 	static double		time2 = 0;
 	static double		time3 = 0;
@@ -711,6 +725,7 @@ void _Host_Frame (float time)
 	rand ();
 
 // decide the simulation time
+	accumtime += host_netinterval?CLAMP(0, time, 0.2):0;	//for renderer/server isolation
 	if (!Host_FilterTime (time))
 		return;			// don't run too fast, or packets will flood out
 
@@ -722,6 +737,9 @@ void _Host_Frame (float time)
 // allow mice or other external controllers to add commands
 	IN_Commands ();
 
+//check the stdin for commands (dedicated servers)
+	Host_GetConsoleCommands ();
+
 // process console commands
 	Cbuf_Execute ();
 
@@ -779,36 +797,31 @@ void _Host_Frame (float time)
 			MSG_WriteByte (&cls.message, clc_nop);
 	}
 
-// if running the server locally, make intentions now
-	if (sv.active)
+	CL_AccumulateCmd ();
+
+	//Run the server+networking (client->server->client), at a different rate from everyt
+	if (accumtime >= host_netinterval)
+	{
+		float realframetime = host_frametime;
+		accumtime -= host_netinterval;
+		if (host_netinterval)
+		{
+			host_frametime = host_netinterval;
+			if (host_timescale.value > 0)
+				host_frametime *= host_timescale.value;
+			else if (host_framerate.value)
+				host_frametime = host_framerate.value;
+		}
 		CL_SendCmd ();
-
-//-------------------
-//
-// server operations
-//
-//-------------------
-
-// check for commands typed to the host
-	Host_GetConsoleCommands ();
-
 		if (sv.active)
 		{
 			PR_SwitchQCVM(&sv.qcvm);
 			Host_ServerFrame ();
 			PR_SwitchQCVM(NULL);
 		}
-
-//-------------------
-//
-// client operations
-//
-//-------------------
-
-// if running the server remotely, send intentions now after
-// the incoming messages have been read
-	if (!sv.active)
-		CL_SendCmd ();
+		host_frametime = realframetime;
+		Cbuf_Waited();
+	}
 
 // fetch results from server
 	if (cls.state == ca_connected)
@@ -851,7 +864,7 @@ void _Host_Frame (float time)
 
 }
 
-void Host_Frame (float time)
+void Host_Frame (double time)
 {
 	double	time1, time2;
 	static double	timetotal;

Quake/quakedef.h

@@ -335,7 +335,7 @@ FUNC_NORETURN void Host_EndGame (const char *message, ...) FUNC_PRINTF(1,2);
 #pragma aux Host_Error aborts;
 #pragma aux Host_EndGame aborts;
 #endif
-void Host_Frame (float time);
+void Host_Frame (double time);
 void Host_Quit_f (void);
 void Host_ClientCommands (const char *fmt, ...) FUNC_PRINTF(1,2);
 void Host_ShutdownServer (qboolean crash);