Next round of UFO tweaks

- Damage depends on item thrown at it.
- UFO speeds up when getting damaged.
- Made UFO speed up more often.
- First Special Stage item column is active farther back.
- Items can't be disabled if rules can't be changed.
- Item column code with items disabled uses fractional precision.
- Fixed bug with the new item table code to support different lengths better.
- Tweaked UFO speed values again.
- UFO is no longer solid.

src/info.c

@@ -29081,7 +29081,7 @@ mobjinfo_t mobjinfo[NUMMOBJTYPES] =
 		16,             // mass
 		0,              // damage
 		sfx_None,       // activesound
-		MF_SOLID|MF_SHOOTABLE|MF_NOGRAVITY|MF_DONTENCOREMAP, // flags
+		MF_SHOOTABLE|MF_NOGRAVITY|MF_DONTENCOREMAP, // flags
 		S_NULL          // raisestate
 	},
 };

src/k_kart.h

@@ -56,6 +56,7 @@ UINT8 K_ItemResultToAmount(SINT8 getitem);
 tic_t K_GetItemCooldown(SINT8 itemResult);
 void K_SetItemCooldown(SINT8 itemResult, tic_t time);
 void K_RunItemCooldowns(void);
+boolean K_ItemEnabled(SINT8 item);
 fixed_t K_GetMobjWeight(mobj_t *mobj, mobj_t *against);
 boolean K_KartBouncing(mobj_t *mobj1, mobj_t *mobj2);
 boolean K_KartSolidBounce(mobj_t *bounceMobj, mobj_t *solidMobj);

src/k_roulette.c

@@ -693,7 +693,12 @@ static UINT8 K_FindUseodds(const player_t *player, itemroulette_t *const roulett
 	{
 		UINT8 j;
 
-		if (gametype == GT_BATTLE && i > 1)
+		if (specialStage.active == true && i > 3)
+		{
+			oddsvalid[i] = false;
+			continue;
+		}
+		else if (gametype == GT_BATTLE && i > 1)
 		{
 			oddsValid[i] = false;
 			continue;
@@ -724,7 +729,7 @@ static UINT8 K_FindUseodds(const player_t *player, itemroulette_t *const roulett
 	{
 		if (specialStage.active == true) // Special Stages
 		{
-			SETUPDISTTABLE(0,1);
+			SETUPDISTTABLE(0,2);
 			SETUPDISTTABLE(1,2);
 			SETUPDISTTABLE(2,3);
 			SETUPDISTTABLE(3,1);

src/objects/ufo.c

@@ -24,12 +24,12 @@
 #include "../k_waypoint.h"
 #include "../k_specialstage.h"
 
-#define UFO_BASE_SPEED (16 * FRACUNIT) // UFO's slowest speed.
+#define UFO_BASE_SPEED (24 * FRACUNIT) // UFO's slowest speed.
-#define UFO_SPEEDUP (FRACUNIT >> 3)
+#define UFO_SPEEDUP (FRACUNIT >> 1) // Acceleration
-#define UFO_SLOWDOWN (FRACUNIT >> 2)
+#define UFO_SLOWDOWN (FRACUNIT >> 1) // Deceleration
-#define UFO_SPACING (1024 * FRACUNIT)
+#define UFO_SPACING (1024 * FRACUNIT) // How far the UFO wants to stay in front
-#define UFO_DEADZONE (768 * FRACUNIT)
+#define UFO_DEADZONE (2048 * FRACUNIT) // Deadzone where it won't update it's speed as much.
-#define UFO_SPEEDFACTOR (FRACUNIT * 9 / 10)
+#define UFO_SPEEDFACTOR (FRACUNIT * 9 / 10) // Factor of player's best speed, to make it more fair.
 
 #define ufo_waypoint(o) ((o)->extravalue1)
 #define ufo_distancetofinish(o) ((o)->extravalue2)
@@ -157,19 +157,19 @@ static void UFOUpdateSpeed(mobj_t *ufo)
 
 		distDelta = ufo_distancetofinish(ufo) - wantedDist;
 
-		if (abs(distDelta) <= deadzone)
-		{
-			// We're in a good spot, try to match the player.
-			wantedSpeed = max(bestSpeed >> 1, baseSpeed);
-		}
-		else
-		{
 		if (distDelta > 0)
 		{
 			// Too far behind! Start speeding up!
 			wantedSpeed = max(bestSpeed << 1, baseSpeed << 2);
 		}
 		else
+		{
+			if (abs(distDelta) < deadzone)
+			{
+				// We're in a good spot, try to match the player.
+				wantedSpeed = max(bestSpeed >> 1, baseSpeed);
+			}
+			else
 			{
 				// Too far ahead! Start slowing down!
 				wantedSpeed = baseSpeed;
@@ -354,14 +354,29 @@ static UINT8 GetUFODamage(mobj_t *inflictor)
 {
 	if (inflictor == NULL || P_MobjWasRemoved(inflictor) == true)
 	{
-		return 1;
+		// Default damage value.
+		return 10;
 	}
 
 	switch (inflictor->type)
 	{
+		case MT_SPB:
+		{
+			// SPB deals triple damage.
+			return 30;
+		}
+		case MT_ORBINAUT:
+		case MT_ORBINAUT_SHIELD:
+		{
+			// Orbinauts deal double damage.
+			return 20;
+		}
+		case MT_JAWZ:
+		case MT_JAWZ_SHIELD:
 		default:
 		{
-			return 1;
+			// Jawz deal minimal damage.
+			return 10;
 		}
 	}
 }
@@ -373,6 +388,9 @@ boolean Obj_SpecialUFODamage(mobj_t *ufo, mobj_t *inflictor, mobj_t *source, UIN
 	(void)source;
 	(void)damageType;
 
+	// Speed up on damage!
+	ufo_speed(ufo) += FixedMul(UFO_BASE_SPEED, K_GetKartGameSpeedScalar(gamespeed));
+
 	if (UFOEmeraldChase(ufo) == true)
 	{
 		// Damaged fully already, no need for any more.
@@ -384,14 +402,14 @@ boolean Obj_SpecialUFODamage(mobj_t *ufo, mobj_t *inflictor, mobj_t *source, UIN
 
 	if (damage >= ufo->health - 1)
 	{
-		// Turn into just an emerald, and make it collectible!
+		// Destroy the UFO parts, and make the emerald collectible!
 		ufo->health = 1;
 		ufo->flags = (ufo->flags & ~MF_SHOOTABLE) | (MF_SPECIAL|MF_PICKUPFROMBELOW);
 		return true;
 	}
 
 	ufo->health -= damage;
-	K_SetHitLagForObjects(ufo, inflictor, damage * 6, true);
+	K_SetHitLagForObjects(ufo, inflictor, (damage / 3) + 2, true);
 	return true;
 }
 
@@ -415,15 +433,18 @@ static mobj_t *InitSpecialUFO(waypoint_t *start)
 		UFOUpdateDistanceToFinish(ufo);
 	}
 
-	ufo_speed(ufo) = UFO_BASE_SPEED;
+	ufo_speed(ufo) = FixedMul(UFO_BASE_SPEED << 2, K_GetKartGameSpeedScalar(gamespeed));
 
+	// TODO: Adjustable Special Stage emerald color
 	ufo->color = SKINCOLOR_CHAOSEMERALD1;
 
 	underlay = P_SpawnMobjFromMobj(ufo, 0, 0, 0, MT_OVERLAY);
 	P_SetTarget(&underlay->target, ufo);
-	P_SetMobjState(underlay, S_CHAOSEMERALD_UNDER);
 	underlay->color = ufo->color;
 
+	// TODO: Super Emeralds / Chaos Rings
+	P_SetMobjState(underlay, S_CHAOSEMERALD_UNDER);
+
 	return ufo;
 }