Keep look backwards direction in a variable, so it can smoothly rotate

src/d_clisrv.c

@@ -631,6 +631,8 @@ static inline void resynch_write_player(resynch_pak *rsp, const size_t i)
 	rsp->tumbleLastBounce = players[i].tumbleLastBounce;
 	rsp->tumbleSound = players[i].tumbleSound;
 
+	rsp->glanceDir = players[i].glanceDir;
+
 	// respawnvars_t
 	rsp->respawn_state = players[i].respawn.state;
 	rsp->respawn_pointx = (fixed_t)LONG(players[i].respawn.pointx);
@@ -789,6 +791,8 @@ static void resynch_read_player(resynch_pak *rsp)
 	players[i].tumbleLastBounce = (boolean)rsp->tumbleLastBounce;
 	players[i].tumbleSound = (boolean)rsp->tumbleSound;
 
+	players[i].glanceDir = (SINT8)rsp->glanceDir;
+
 	// respawnvars_t
 	players[i].respawn.state = rsp->respawn_state;
 	players[i].respawn.pointx = (fixed_t)LONG(rsp->respawn_pointx);

src/d_clisrv.h

@@ -295,6 +295,8 @@ typedef struct
 	boolean tumbleLastBounce;
 	boolean tumbleSound;
 
+	SINT8 glanceDir;
+
 	// respawnvars_t
 	UINT8 respawn_state;
 	fixed_t respawn_pointx;

src/d_player.h

@@ -569,6 +569,8 @@ typedef struct player_s
 	boolean tumbleLastBounce;
 	boolean tumbleSound;
 
+	SINT8 glanceDir; // Direction the player is trying to look backwards in
+
 	//
 
 	UINT32 charflags; // Extra abilities/settings for skins (combinable stuff)

src/k_kart.c

@@ -1849,6 +1849,8 @@ void K_KartMoveAnimation(player_t *player)
 	ticcmd_t *cmd = &player->cmd;
 	const boolean spinningwheels = ((cmd->buttons & BT_ACCELERATE) || (onground && player->speed > 0));
 
+	SINT8 destGlanceDir = 0;
+
 	if (cmd->turning < -minturn)
 	{
 		turndir = -1;
@@ -1943,27 +1945,46 @@ void K_KartMoveAnimation(player_t *player)
 		}
 		else
 		{
-			SINT8 glanceDir = 0;
-
 			if (turndir == 0)
 			{
 				// Only try glancing if you're driving straight.
-				glanceDir = K_GlanceAtPlayers(player);
+				destGlanceDir = K_GlanceAtPlayers(player);
 
 				if (cmd->buttons & BT_LOOKBACK)
 				{
-					if (glanceDir == 0)
+					if (destGlanceDir == 0)
 					{
-						// Look to your right by default
+						if (player->glanceDir != 0)
-						glanceDir = -1;
+						{
+							// Keep to the side you were already on.
+							if (player->glanceDir < 0)
+							{
+								destGlanceDir = -1;
+							}
+							else
+							{
+								destGlanceDir = 1;
+							}
+						}
+						else
+						{
+							// Look to your right by default
+							destGlanceDir = -1;
+						}
 					}
 					else
 					{
 						// Looking back AND glancing? Amplify the look!
-						glanceDir *= 2;
+						destGlanceDir *= 2;
 					}
 				}
 			}
+			else
+			{
+				// Not glancing
+				destGlanceDir = 0;
+				player->glanceDir = 0;
+			}
 
 			if (player->speed >= fastspeed && player->speed >= (player->lastspeed - speedthreshold))
 			{
@@ -1979,7 +2000,7 @@ void K_KartMoveAnimation(player_t *player)
 				}
 				else
 				{
-					switch (glanceDir)
+					switch (player->glanceDir)
 					{
 						case -2:
 							SetState(S_KART_FAST_LOOK_R);
@@ -2015,7 +2036,7 @@ void K_KartMoveAnimation(player_t *player)
 					}
 					else
 					{
-						switch (glanceDir)
+						switch (player->glanceDir)
 						{
 							case -2:
 								SetState(S_KART_SLOW_LOOK_R);
@@ -2049,7 +2070,7 @@ void K_KartMoveAnimation(player_t *player)
 					}
 					else
 					{
-						switch (glanceDir)
+						switch (player->glanceDir)
 						{
 							case -2:
 								SetState(S_KART_STILL_LOOK_R);
@@ -2070,6 +2091,16 @@ void K_KartMoveAnimation(player_t *player)
 					}
 				}
 			}
+
+			// Update your value to smooth it out.
+			if (player->glanceDir > destGlanceDir)
+			{
+				player->glanceDir--;
+			}
+			else if (player->glanceDir < destGlanceDir)
+			{
+				player->glanceDir++;
+			}
 		}
 	}
 

src/lua_playerlib.c

@@ -222,6 +222,8 @@ static int player_get(lua_State *L)
 		lua_pushboolean(L, plr->tumbleLastBounce);
 	else if (fastcmp(field,"tumbleSound"))
 		lua_pushboolean(L, plr->tumbleSound);
+	else if (fastcmp(field,"glanceDir"))
+		lua_pushinteger(L, plr->glanceDir);
 	else if (fastcmp(field,"trickpanel"))
 		lua_pushinteger(L, plr->trickpanel);
 	else if (fastcmp(field,"trickdelay"))
@@ -529,6 +531,8 @@ static int player_set(lua_State *L)
 		plr->tumbleLastBounce = luaL_checkboolean(L, 3);
 	else if (fastcmp(field,"tumbleSound"))
 		plr->tumbleSound = luaL_checkboolean(L, 3);
+	else if (fastcmp(field,"glanceDir"))
+		plr->glanceDir = (SINT8)luaL_checkinteger(L, 3);
 	else if (fastcmp(field,"trickpanel"))
 		plr->trickpanel = luaL_checkinteger(L, 3);
 	else if (fastcmp(field,"trickdelay"))

src/p_saveg.c

@@ -271,6 +271,8 @@ static void P_NetArchivePlayers(void)
 		WRITEUINT8(save_p, players[i].tumbleLastBounce);
 		WRITEUINT8(save_p, players[i].tumbleSound);
 
+		WRITESINT8(save_p, players[i].glanceDir);
+
 		// respawnvars_t
 		WRITEUINT8(save_p, players[i].respawn.state);
 		WRITEUINT32(save_p, K_GetWaypointHeapIndex(players[i].respawn.wp));
@@ -471,6 +473,8 @@ static void P_NetUnArchivePlayers(void)
 		players[i].tumbleLastBounce = (boolean)READUINT8(save_p);
 		players[i].tumbleSound = (boolean)READUINT8(save_p);
 
+		players[i].glanceDir = READSINT8(save_p);
+
 		// respawnvars_t
 		players[i].respawn.state = READUINT8(save_p);
 		players[i].respawn.wp = (waypoint_t *)(size_t)READUINT32(save_p);