Make sliptiding actually good (no visuals)

50% increased effect of handling boosts, 75% reduced penalty for handling boost stacking, grants a boost proportional to your sliptide length when you straighten out

src/d_player.h

@@ -675,6 +675,10 @@ struct player_t
 
 	UINT8 tripwireReboundDelay; // When failing Tripwire, brieftly lock out speed-based tripwire pass (anti-cheese)
 
+	UINT16 sliptideZip; // How long is our chained sliptide? Grant a proportional boost when it's over.
+	UINT8 sliptideZipDelay; // How long since the last sliptide? Only boost once you've been straightened out for a bit.
+	UINT16 sliptideZipBoost; // The actual boost granted from sliptideZip.
+
 	mobj_t *stumbleIndicator;
 
 #ifdef HWRENDER

src/k_kart.c

@@ -1809,6 +1809,11 @@ static void K_SpawnGenericSpeedLines(player_t *player, boolean top)
 		fast->colorized = true;
 		fast->renderflags |= RF_ADD;
 	}
+	else if (player->sliptideZipBoost)
+	{
+		fast->color = SKINCOLOR_WHITE;
+		fast->colorized = true;
+	}
 }
 
 void K_SpawnNormalSpeedLines(player_t *player)
@@ -3046,7 +3051,7 @@ static void K_GetKartBoostPower(player_t *player)
 	speedboost += FixedDiv(s, FRACUNIT + (metabolism * (numboosts-1))); \
 	accelboost += FixedDiv(a, FRACUNIT + (metabolism * (numboosts-1))); \
 	if (player->aizdriftstrat) \
-		handleboost += FixedDiv(h, FRACUNIT + (metabolism * (numboosts-1))); \
+		handleboost += FixedDiv(3*h/2, FRACUNIT + (metabolism * (numboosts-1))/4); \
 	else \
 		handleboost = max(h, handleboost); \
 }
@@ -3080,6 +3085,11 @@ static void K_GetKartBoostPower(player_t *player)
 		);
 	}
 
+	if (player->sliptideZipBoost)
+	{
+		ADDBOOST(3*FRACUNIT/4, 4*FRACUNIT, sliptidehandling/2); 
+	}
+
 	if (player->spindashboost) // Spindash boost
 	{
 		const fixed_t MAXCHARGESPEED = K_GetSpindashChargeSpeed(player);
@@ -7483,7 +7493,7 @@ void K_KartPlayerThink(player_t *player, ticcmd_t *cmd)
 			if (player->sneakertimer || player->ringboost
 				|| player->driftboost || player->startboost
 				|| player->eggmanexplode || player->trickboost
-				|| player->gateBoost)
+				|| player->gateBoost || player->sliptideZipBoost)
 			{
 #if 0
 				if (player->invincibilitytimer)
@@ -7745,6 +7755,11 @@ void K_KartPlayerThink(player_t *player, ticcmd_t *cmd)
 		player->startboost--;
 	}
 
+	if (player->sliptideZipBoost > 0 && onground == true)
+	{
+		player->sliptideZipBoost--;
+	}
+
 	if (player->spindashboost)
 	{
 		player->spindashboost--;
@@ -9205,6 +9220,8 @@ static void K_KartDrift(player_t *player, boolean onground)
 	{
 		K_SpawnAIZDust(player);
 
+		player->sliptideZip++;
+
 		if (abs(player->aizdrifttilt) < ANGLE_22h)
 		{
 			player->aizdrifttilt =
@@ -9222,6 +9239,18 @@ static void K_KartDrift(player_t *player, boolean onground)
 
 	if (!K_Sliptiding(player))
 	{
+		if (player->sliptideZip > 0)
+		{
+			player->sliptideZipDelay++;
+			if (player->sliptideZipDelay > TICRATE && player->drift == 0)
+			{
+				S_StartSound(player->mo, sfx_s3kb6);
+				player->sliptideZipBoost += player->sliptideZip;
+				player->sliptideZip = 0;
+				player->sliptideZipDelay = 0;
+			}
+		}
+
 		player->aizdrifttilt -= player->aizdrifttilt / 4;
 		player->aizdriftturn -= player->aizdriftturn / 4;
 
@@ -9230,6 +9259,10 @@ static void K_KartDrift(player_t *player, boolean onground)
 		if (abs(player->aizdriftturn) < ANGLE_11hh)
 			player->aizdriftturn = 0;
 	}
+	else
+	{
+		player->sliptideZipDelay = 0;
+	}
 
 	if (player->drift
 		&& ((buttons & BT_BRAKE)

src/lua_playerlib.c

@@ -308,6 +308,12 @@ static int player_get(lua_State *L)
 		lua_pushinteger(L, plr->tripwireLeniency);
 	else if (fastcmp(field,"tripwireReboundDelay"))
 		lua_pushinteger(L, plr->tripwireReboundDelay);
+	else if (fastcmp(field,"sliptideZip"))
+		lua_pushinteger(L, plr->sliptideZip);
+	else if (fastcmp(field,"sliptideZipDelay"))
+		lua_pushinteger(L, plr->sliptideZipDelay);
+	else if (fastcmp(field,"sliptideZipBoost"))
+		lua_pushinteger(L, plr->sliptideZipDelay);
 	/*
 	else if (fastcmp(field,"itemroulette"))
 		lua_pushinteger(L, plr->itemroulette);
@@ -688,6 +694,12 @@ static int player_set(lua_State *L)
 		plr->tripwireLeniency = luaL_checkinteger(L, 3);
 	else if (fastcmp(field,"tripwireReboundDelay"))
 		plr->tripwireReboundDelay = luaL_checkinteger(L, 3);
+	else if (fastcmp(field,"sliptideZip"))
+		plr->sliptideZip = luaL_checkinteger(L, 3);
+	else if (fastcmp(field,"sliptideZipDelay"))
+		plr->sliptideZipDelay = luaL_checkinteger(L, 3);
+	else if (fastcmp(field,"sliptideZipBoost"))
+		plr->sliptideZipDelay = luaL_checkinteger(L, 3);
 	/*
 	else if (fastcmp(field,"itemroulette"))
 		plr->itemroulette = luaL_checkinteger(L, 3);

src/p_saveg.c

@@ -397,6 +397,10 @@ static void P_NetArchivePlayers(savebuffer_t *save)
 
 		WRITEUINT8(save->p, players[i].tripwireReboundDelay);
 
+		WRITEUINT16(save->p, players[i].sliptideZip);
+		WRITEUINT8(save->p, players[i].sliptideZipDelay);
+		WRITEUINT16(save->p, players[i].sliptideZipBoost);
+
 		// respawnvars_t
 		WRITEUINT8(save->p, players[i].respawn.state);
 		WRITEUINT32(save->p, K_GetWaypointHeapIndex(players[i].respawn.wp));
@@ -767,6 +771,10 @@ static void P_NetUnArchivePlayers(savebuffer_t *save)
 
 		players[i].tripwireReboundDelay = READUINT8(save->p);
 
+		players[i].sliptideZip = READUINT16(save->p);
+		players[i].sliptideZipDelay = READUINT8(save->p);
+		players[i].sliptideZipBoost = READUINT16(save->p);
+
 		// respawnvars_t
 		players[i].respawn.state = READUINT8(save->p);
 		players[i].respawn.wp = (waypoint_t *)(size_t)READUINT32(save->p);