Interpolate from time of previous tic

Previously interpolated from last 35th of a second, which
may be offset from game time due to connection lag.

Consider this the proper fix to 6ecac4159a too.

src/d_clisrv.c

@@ -5259,8 +5259,10 @@ static void SV_Maketic(void)
 	maketic++;
 }
 
-void TryRunTics(tic_t realtics)
+boolean TryRunTics(tic_t realtics)
 {
+	boolean ticking;
+
 	// the machine has lagged but it is not so bad
 	if (realtics > TICRATE/7) // FIXME: consistency failure!!
 	{
@@ -5304,7 +5306,9 @@ void TryRunTics(tic_t realtics)
 	}
 #endif
 
-	if (neededtic > gametic)
+	ticking = neededtic > gametic;
+
+	if (ticking)
 	{
 		if (realtics)
 			hu_stopped = false;
@@ -5314,10 +5318,10 @@ void TryRunTics(tic_t realtics)
 	{
 		if (realtics)
 			hu_stopped = true;
-		return;
+		return false;
 	}
 
-	if (neededtic > gametic)
+	if (ticking)
 	{
 		if (advancedemo)
 		{
@@ -5354,6 +5358,8 @@ void TryRunTics(tic_t realtics)
 		if (realtics)
 			hu_stopped = true;
 	}
+
+	return ticking;
 }
 
 

src/d_clisrv.h

@@ -488,7 +488,7 @@ boolean Playing(void);
 void D_QuitNetGame(void);
 
 //? How many ticks to run?
-void TryRunTics(tic_t realtic);
+boolean TryRunTics(tic_t realtic);
 
 // extra data for lmps
 // these functions scare me. they contain magic.

src/d_main.c

@@ -687,6 +687,7 @@ tic_t rendergametic;
 void D_SRB2Loop(void)
 {
 	tic_t oldentertics = 0, entertic = 0, realtics = 0, rendertimeout = INFTICS;
+	boolean ticked;
 
 	if (dedicated)
 		server = true;
@@ -774,11 +775,20 @@ void D_SRB2Loop(void)
 			realtics = 1;
 
 		// process tics (but maybe not if realtic == 0)
-		TryRunTics(realtics);
+		ticked = TryRunTics(realtics);
 
-		if (cv_frameinterpolation.value == 1 && !(paused || P_AutoPause() || hu_stopped))
+		if (cv_frameinterpolation.value == 1 && !(paused || P_AutoPause()))
 		{
-			fixed_t entertimefrac = I_GetTimeFrac();
+			static float tictime;
+			float entertime = I_GetTimeFrac();
+
+			fixed_t entertimefrac;
+
+			if (ticked)
+				tictime = entertime;
+
+			entertimefrac = FLOAT_TO_FIXED(entertime - tictime);
+
 			// renderdeltatics is a bit awkard to evaluate, since the system time interface is whole tic-based
 			renderdeltatics = realtics * FRACUNIT;
 			if (entertimefrac > rendertimefrac)

src/i_system.h

@@ -46,9 +46,9 @@ UINT32 I_GetFreeMem(UINT32 *total);
 */
 tic_t I_GetTime(void);
 
-/** \brief  Get the current time as a fraction of a tic since the last tic.
+/** \brief  Get the current time in tics including fractions.
 */
-fixed_t I_GetTimeFrac(void);
+float I_GetTimeFrac(void);
 
 /**	\brief	Returns precise time value for performance measurement.
   */

src/sdl/i_system.c

@@ -1568,11 +1568,10 @@ tic_t I_GetTime(void)
 	return (tic_t)f;
 }
 
-fixed_t I_GetTimeFrac(void)
+float I_GetTimeFrac(void)
 {
 	UpdateElapsedTics();
-	
-	return FLOAT_TO_FIXED((float) (elapsed_tics - floor(elapsed_tics)));
+	return elapsed_tics;
 }
 
 precise_t I_GetPreciseTime(void)