Bots: Improve rubberbanding further

- Use easing functions for the rubberbanding values themselves, for more fine-control over the end-points and the curves.
- Fixed K_UpdateRubberband being broken from using shift instead of divide.
- Rename `debugbotpredict` to `debugbots`, it now displays some of the bots' botvars values as well. If the player isn't a bot, it will show them from the first place bot (for inspecting the rubberband value).
- Bot turning buff was increased, from x1.25 to x2.0. Noticed that Tails bots were failing turns on Popcorn Workshop. I personally think that Tails bots shouldn't be failing very many turns unless if they're finding objects, and constant wall-bumping should be reserved for Eggman and Metal :P

src/d_netcmd.c

@@ -449,7 +449,7 @@ consvar_t cv_kartdebugdistribution = CVAR_INIT ("debugitemodds", "Off", CV_NETVA
 consvar_t cv_kartdebughuddrop = CVAR_INIT ("debugitemdrop", "Off", CV_NETVAR|CV_CHEAT, CV_OnOff, NULL);
 static CV_PossibleValue_t kartdebugwaypoint_cons_t[] = {{0, "Off"}, {1, "Forwards"}, {2, "Backwards"}, {0, NULL}};
 consvar_t cv_kartdebugwaypoints = CVAR_INIT ("debugwaypoints", "Off", CV_NETVAR|CV_CHEAT, kartdebugwaypoint_cons_t, NULL);
-consvar_t cv_kartdebugbotpredict = CVAR_INIT ("debugbotpredict", "Off", CV_NETVAR|CV_CHEAT, CV_OnOff, NULL);
+consvar_t cv_kartdebugbots = CVAR_INIT ("debugbots", "Off", CV_NETVAR|CV_CHEAT, CV_OnOff, NULL);
 consvar_t cv_kartdebugnodes = CVAR_INIT ("debugnodes", "Off", CV_CHEAT, CV_OnOff, NULL);
 consvar_t cv_kartdebugcolorize = CVAR_INIT ("debugcolorize", "Off", CV_CHEAT, CV_OnOff, NULL);
 consvar_t cv_kartdebugdirector = CVAR_INIT ("debugdirector", "Off", CV_CHEAT, CV_OnOff, NULL);

src/d_netcmd.h

@@ -96,7 +96,7 @@ extern consvar_t cv_botscanvote;
 extern consvar_t cv_kartdebugitem, cv_kartdebugamount, cv_kartdebugdistribution, cv_kartdebughuddrop;
 extern consvar_t cv_kartdebugnodes, cv_kartdebugcolorize, cv_kartdebugdirector;
 extern consvar_t cv_spbtest, cv_reducevfx;
-extern consvar_t cv_kartdebugwaypoints, cv_kartdebugbotpredict;
+extern consvar_t cv_kartdebugwaypoints, cv_kartdebugbots;
 extern consvar_t cv_debugrank;
 extern consvar_t cv_battletest;
 

src/k_bot.c

@@ -487,11 +487,19 @@ static UINT32 K_BotRubberbandDistance(player_t *player)
 --------------------------------------------------*/
 fixed_t K_BotRubberband(player_t *player)
 {
+	const fixed_t difficultyEase = ((player->botvars.difficulty - 1) * FRACUNIT) / (DIFFICULTBOT - 1);
+
+	// Lv.   1: x0.35 min
+	// Lv.   9: x1.35 min
+	const fixed_t rubbermin = Easing_Linear(difficultyEase, FRACUNIT * 35 / 100, FRACUNIT * 135 / 100);
+
+	// Lv.   1: x1.0 max
+	// Lv.   9: x1.65 max
+	const fixed_t rubbermax = Easing_Linear(difficultyEase, FRACUNIT, FRACUNIT * 165 / 100);
+
 	fixed_t rubberband = FRACUNIT >> 1;
-	fixed_t rubbermin = FRACUNIT;
-	fixed_t rubbermax = FRACUNIT;
 	player_t *firstplace = NULL;
-	UINT8 i;
+	size_t i = SIZE_MAX;
 
 	if (player->exiting)
 	{
@@ -513,18 +521,6 @@ fixed_t K_BotRubberband(player_t *player)
 		}
 	}
 
-	// Lv.   1: x0.5 min
-	// Lv.   5: x0.75 min
-	// Lv.   9: x1.0 min
-	// Lv. MAX: x1.25 min
-	rubbermin = FRACUNIT - (((FRACUNIT/2) * (DIFFICULTBOT - player->botvars.difficulty)) / (DIFFICULTBOT - 1));
-
-	// Lv.   1: x0.8 max
-	// Lv.   5: x1.2 max
-	// Lv.   9: x1.4 max
-	// Lv. MAX: x2.0 max
-	rubbermax = FRACUNIT + ((FRACUNIT * (player->botvars.difficulty - 3)) / 10);
-
 	for (i = 0; i < MAXPLAYERS; i++)
 	{
 		if (!playeringame[i] || players[i].spectator)
@@ -548,20 +544,28 @@ fixed_t K_BotRubberband(player_t *player)
 
 	if (firstplace != NULL)
 	{
-		const UINT32 spacing = FixedDiv(1280 * mapobjectscale, K_GetKartGameSpeedScalar(gamespeed)) / FRACUNIT;
+		// Lv.   1: 5120 units
+		// Lv.   9: 320 units
+		const fixed_t spacing = FixedDiv(
+			max(
+				80 * mapobjectscale,
+				Easing_Linear(difficultyEase, 5120 * mapobjectscale, 320 * mapobjectscale)
+			),
+			K_GetKartGameSpeedScalar(gamespeed)
+		) / FRACUNIT;
 		const UINT32 wanteddist = firstplace->distancetofinish + K_BotRubberbandDistance(player);
 		const INT32 distdiff = player->distancetofinish - wanteddist;
 
-		rubberband += (distdiff * (FRACUNIT >> 1)) / spacing;
-	}
+		rubberband = FixedDiv(distdiff + spacing, spacing * 2);
 
-	if (rubberband > FRACUNIT)
-	{
-		rubberband = FRACUNIT;
-	}
-	else if (rubberband < 0)
-	{
-		rubberband = 0;
+		if (rubberband > FRACUNIT)
+		{
+			rubberband = FRACUNIT;
+		}
+		else if (rubberband < 0)
+		{
+			rubberband = 0;
+		}
 	}
 
 	return Easing_Linear(rubberband, rubbermin, rubbermax);
@@ -578,7 +582,7 @@ fixed_t K_UpdateRubberband(player_t *player)
 	fixed_t ret = player->botvars.rubberband;
 
 	// Ease into the new value.
-	ret += (dest - player->botvars.rubberband) >> 3;
+	ret += (dest - player->botvars.rubberband) / 8;
 
 	return ret;
 }
@@ -1732,7 +1736,7 @@ void K_BuildBotTiccmd(player_t *player, ticcmd_t *cmd)
 	// Free the prediction we made earlier
 	if (predict != NULL)
 	{
-		if (cv_kartdebugbotpredict.value != 0 && player - players == displayplayers[0])
+		if (cv_kartdebugbots.value != 0 && player - players == displayplayers[0])
 		{
 			K_DrawPredictionDebug(predict, player);
 		}

src/k_hud.c

@@ -4994,6 +4994,73 @@ static void K_DrawWaypointDebugger(void)
 	}
 }
 
+static void K_DrawBotDebugger(void)
+{
+	player_t *bot = NULL;
+
+	if (cv_kartdebugbots.value == 0)
+	{
+		return;
+	}
+
+	if (stplyr != &players[displayplayers[0]]) // only for p1
+	{
+		return;
+	}
+
+	if (stplyr->bot == true)
+	{
+		// we ARE the bot
+		bot = stplyr;
+	}
+	else
+	{
+		// get winning bot
+		size_t i;
+		for (i = 0; i < MAXPLAYERS; i++)
+		{
+			player_t *p = NULL;
+
+			if (playeringame[i] == false)
+			{
+				continue;
+			}
+
+			p = &players[i];
+			if (p->spectator == true || p->bot == false)
+			{
+				continue;
+			}
+
+			if (bot == NULL || p->distancetofinish < bot->distancetofinish)
+			{
+				bot = p;
+			}
+		}
+	}
+
+	if (bot == NULL)
+	{
+		// no bot exists?
+		return;
+	}
+
+	V_DrawSmallString(8, 8, 0, va("Difficulty: %d / %d", bot->botvars.difficulty, MAXBOTDIFFICULTY));
+	V_DrawSmallString(8, 12, 0, va("Difficulty increase: %d", bot->botvars.diffincrease));
+	V_DrawSmallString(8, 16, 0, va("Rival: %d", (UINT8)(bot->botvars.rival == true)));
+	V_DrawSmallString(8, 20, 0, va("Rubberbanding: %.02f", FIXED_TO_FLOAT(bot->botvars.rubberband) * 100.0f));
+
+	V_DrawSmallString(8, 26, 0, va("Item delay: %d", bot->botvars.itemdelay));
+	V_DrawSmallString(8, 30, 0, va("Item confirm: %d", bot->botvars.itemconfirm));
+
+	V_DrawSmallString(8, 36, 0, va("Turn: %d / %d / %d", -BOTTURNCONFIRM, bot->botvars.turnconfirm, BOTTURNCONFIRM));
+	V_DrawSmallString(8, 40, 0, va("Spindash: %d / %d", bot->botvars.spindashconfirm, BOTSPINDASHCONFIRM));
+	V_DrawSmallString(8, 44, 0, va("Respawn: %d / %d", bot->botvars.respawnconfirm, BOTRESPAWNCONFIRM));
+
+	V_DrawSmallString(8, 50, 0, va("Item priority: %d", bot->botvars.roulettePriority));
+	V_DrawSmallString(8, 54, 0, va("Item timeout: %d", bot->botvars.rouletteTimeout));
+}
+
 static void K_DrawGPRankDebugger(void)
 {
 	gp_rank_e grade = GRADE_E;
@@ -5321,6 +5388,7 @@ void K_drawKartHUD(void)
 	}
 
 	K_DrawWaypointDebugger();
+	K_DrawBotDebugger();
 	K_DrawDirectorDebugger();
 	K_DrawGPRankDebugger();
 }

src/k_kart.c

@@ -311,7 +311,7 @@ void K_RegisterKartStuff(void)
 	CV_RegisterVar(&cv_kartdebugdistribution);
 	CV_RegisterVar(&cv_kartdebughuddrop);
 	CV_RegisterVar(&cv_kartdebugwaypoints);
-	CV_RegisterVar(&cv_kartdebugbotpredict);
+	CV_RegisterVar(&cv_kartdebugbots);
 
 	CV_RegisterVar(&cv_kartdebugnodes);
 	CV_RegisterVar(&cv_kartdebugcolorize);
@@ -9004,7 +9004,7 @@ INT16 K_GetKartTurnValue(player_t *player, INT16 turnvalue)
 
 	if (K_PlayerUsesBotMovement(player))
 	{
-		turnfixed = FixedMul(turnfixed, 5*FRACUNIT/4); // Base increase to turning
+		turnfixed = FixedMul(turnfixed, 2*FRACUNIT); // Base increase to turning
 	}
 
 	if (player->drift != 0 && P_IsObjectOnGround(player->mo))