Added FOV Interpolation

src/d_main.cpp

@@ -899,11 +899,8 @@ void D_Display ()
 		DAngle fov = DAngle::fromDeg(90.);
 		AActor *cam = players[consoleplayer].camera;
 		if (cam)
-		{
-			if (cam->player)
-				fov = DAngle::fromDeg(cam->player->FOV);
-			else fov = DAngle::fromDeg(cam->CameraFOV);
-		}
+			fov = DAngle::fromDeg(cam->GetFOV(I_GetTimeFrac()));
+
 		R_SetFOV(vp, fov);
 	}
 

src/g_level.cpp

@@ -1702,6 +1702,7 @@ int FLevelLocals::FinishTravel ()
 		}
 		pawn->LinkToWorld (nullptr);
 		pawn->ClearInterpolation();
+		pawn->ClearFOVInterpolation();
 		const int tid = pawn->tid;	// Save TID (actor isn't linked into the hash chain yet)
 		pawn->tid = 0;				// Reset TID
 		pawn->SetTID(tid);			// Set TID (and link actor into the hash chain)

src/p_tick.cpp

@@ -158,6 +158,7 @@ void P_Ticker (void)
 		while ((ac = it.Next()))
 		{
 			ac->ClearInterpolation();
+			ac->ClearFOVInterpolation();
 		}
 
 		P_ThinkParticles(Level);	// [RH] make the particles think

src/playsim/actor.h

@@ -929,6 +929,8 @@ public:
 	void SetViewAngle(DAngle ang, int fflags);
 	void SetViewRoll(DAngle roll, int fflags);
 
+	double GetFOV(double ticFrac);
+
 	PClassActor *GetBloodType(int type = 0) const;
 
 	double Distance2DSquared(AActor *other, bool absolute = false)
@@ -998,6 +1000,7 @@ public:
 	DVector3 Vec3Angle(double length, DAngle angle, double dz, bool absolute = false);
 
 	void ClearInterpolation();
+	void ClearFOVInterpolation();
 
 	void Move(const DVector3 &vel)
 	{
@@ -1278,6 +1281,7 @@ public:
 	// [RH] Used to interpolate the view to get >35 FPS
 	DVector3 Prev;
 	DRotator PrevAngles;
+	DAngle   PrevFOV;
 	int PrevPortalGroup;
 	TArray<FDynamicLight *> AttachedLights;
 	TDeletingArray<FLightDefaults *> UserLights;

src/playsim/actorinlines.h

@@ -34,6 +34,14 @@ inline void AActor::ClearInterpolation()
 	else PrevPortalGroup = 0;
 }
 
+inline void AActor::ClearFOVInterpolation()
+{
+	if (player)
+		PrevFOV = DAngle::fromDeg(player->FOV);
+	else
+		PrevFOV = DAngle::fromDeg(CameraFOV);
+}
+
 inline double secplane_t::ZatPoint(const AActor *ac) const
 {
 	return (D + normal.X*ac->X() + normal.Y*ac->Y()) * negiC;

src/playsim/d_player.h

@@ -124,6 +124,7 @@ typedef enum
 	CF_INTERPVIEW		= 1 << 14,		// [RH] view was changed outside of input, so interpolate one frame
 	CF_INTERPVIEWANGLES	= 1 << 15,		// [MR] flag for interpolating view angles without interpolating the entire frame
 	CF_SCALEDNOLERP		= 1 << 15,		// [MR] flag for applying angles changes in the ticrate without interpolating the frame
+	CF_NOFOVINTERP		= 1 << 16,		// [B] Disable FOV interpolation when instantly zooming
 	CF_EXTREMELYDEAD	= 1 << 22,		// [RH] Reliably let the status bar know about extreme deaths.
 	CF_BUDDHA2			= 1 << 24,		// [MC] Absolute buddha. No voodoo can kill it either.
 	CF_GODMODE2			= 1 << 25,		// [MC] Absolute godmode. No voodoo can kill it either.

src/playsim/p_mobj.cpp

@@ -407,6 +407,7 @@ void AActor::PostSerialize()
 		}
 	}
 	ClearInterpolation();
+	ClearFOVInterpolation();
 	UpdateWaterLevel(false);
 }
 
@@ -3552,6 +3553,28 @@ void AActor::SetViewAngle(DAngle ang, int fflags)
 
 }
 
+double AActor::GetFOV(double ticFrac)
+{
+	// [B] Disable interpolation when playing online, otherwise it gets vomit inducing
+	if (netgame)
+		return player ? player->FOV : CameraFOV;
+
+	double fov;
+	if (player)
+	{
+		if (player->cheats & CF_NOFOVINTERP)
+			return player->FOV;
+
+		fov = player->FOV;
+	}
+	else
+	{
+		fov = CameraFOV;
+	}
+
+	return PrevFOV.Degrees() * (1 - ticFrac) + fov * ticFrac;
+}
+
 void AActor::SetViewRoll(DAngle r, int fflags)
 {
 	if (r != ViewAngles.Roll)
@@ -4566,6 +4589,7 @@ void ConstructActor(AActor *actor, const DVector3 &pos, bool SpawningMapThing)
 	// set subsector and/or block links
 	actor->LinkToWorld (nullptr, SpawningMapThing);
 	actor->ClearInterpolation();
+	actor->ClearFOVInterpolation();
 
 	actor->dropoffz = actor->floorz = actor->Sector->floorplane.ZatPoint(pos);
 	actor->ceilingz = actor->Sector->ceilingplane.ZatPoint(pos);

src/playsim/p_user.cpp

@@ -1266,6 +1266,7 @@ void P_PlayerThink (player_t *player)
 	player->cheats &= ~CF_INTERPVIEW;
 	player->cheats &= ~CF_INTERPVIEWANGLES;
 	player->cheats &= ~CF_SCALEDNOLERP;
+	player->cheats &= ~CF_NOFOVINTERP;
 	player->mo->FloatVar("prevBob") = player->bob;
 
 	IFVIRTUALPTRNAME(player->mo, NAME_PlayerPawn, PlayerThink)

src/scripting/vmthunks_actors.cpp

@@ -716,6 +716,13 @@ DEFINE_ACTION_FUNCTION_NATIVE(AActor, ClearInterpolation, ClearInterpolation)
 	return 0;
 }
 
+DEFINE_ACTION_FUNCTION(AActor, ClearFOVInterpolation)
+{
+	PARAM_SELF_PROLOGUE(AActor);
+	self->ClearFOVInterpolation();
+	return 0;
+}
+
 static int ApplyDamageFactors(PClassActor *itemcls, int damagetype, int damage, int defdamage)
 {
 	DmgFactors &df = itemcls->ActorInfo()->DamageFactors;

wadsrc/static/zscript/actors/actor.zs

@@ -669,6 +669,7 @@ class Actor : Thinker native
 	native bool UpdateWaterLevel (bool splash = true);
 	native bool IsZeroDamage();
 	native void ClearInterpolation();
+	native void ClearFOVInterpolation();
 	native clearscope Vector3 PosRelative(sector sec) const;
 	native void RailAttack(FRailParams p);
 		

wadsrc/static/zscript/actors/inventory/weapons.zs

@@ -464,6 +464,7 @@ class Weapon : StateProvider
 			if (flags & 1)
 			{ // Make the zoom instant.
 				player.FOV = player.DesiredFOV * zoom;
+				player.cheats |= CF_NOFOVINTERP;
 			}
 			if (flags & 2)
 			{ // Disable pitch/yaw scaling.

wadsrc/static/zscript/actors/player/player_morph.zs

@@ -220,6 +220,7 @@ extend class PlayerPawn
 		{
 			p.camera = morphed;
 		}
+		morphed.ClearFOVInterpolation();
 		morphed.ScoreIcon = ScoreIcon;	// [GRB]
 		if (eflash)	
 			eflash.target = morphed;
@@ -336,6 +337,7 @@ extend class PlayerPawn
 		{
 			player.camera = altmo;
 		}
+		altmo.ClearFOVInterpolation();
 
 		// [MH]
 		// If the player that was morphed is the one

wadsrc/static/zscript/constants.zs

@@ -1140,6 +1140,7 @@ enum EPlayerCheats
 	CF_INTERPVIEW		= 1 << 14,		// [RH] view was changed outside of input, so interpolate one frame
 	CF_INTERPVIEWANGLES	= 1 << 15,		// [MR] flag for interpolating view angles without interpolating the entire frame
 	CF_SCALEDNOLERP		= 1 << 15,		// [MR] flag for applying angles changes in the ticrate without interpolating the frame
+	CF_NOFOVINTERP		= 1 << 16,		// [B] Disable FOV interpolation when instantly zooming
 
 	CF_EXTREMELYDEAD	= 1 << 22,		// [RH] Reliably let the status bar know about extreme deaths.