diff --git a/source/games/blood/src/nnexts.cpp b/source/games/blood/src/nnexts.cpp
index 5974a4177..42b89ae76 100644
--- a/source/games/blood/src/nnexts.cpp
+++ b/source/games/blood/src/nnexts.cpp
@@ -3462,7 +3462,7 @@ void useSectorWindGen(DBloodActor* sourceactor, sectortype* pSector)
 				sourceactor->set_int_ang(nnExtRandom(-kAng360, kAng360) & 2047);
 		}
 	}
-	else if (sourceactor->spr.cstat & CSTAT_SPRITE_MOVE_FORWARD) sourceactor->spr.__int_angle += sourceactor->xspr.data4;
+	else if (sourceactor->spr.cstat & CSTAT_SPRITE_MOVE_FORWARD) sourceactor->add_int_ang(sourceactor->xspr.data4);
 	else if (sourceactor->spr.cstat & CSTAT_SPRITE_MOVE_REVERSE) sourceactor->spr.__int_angle -= sourceactor->xspr.data4;
 	else if (sourceactor->xspr.sysData1 == 0)
 	{
diff --git a/source/games/duke/src/actors.cpp b/source/games/duke/src/actors.cpp
index ea2706027..820bb8cc3 100644
--- a/source/games/duke/src/actors.cpp
+++ b/source/games/duke/src/actors.cpp
@@ -1423,7 +1423,7 @@ bool rat(DDukeActor* actor, bool makesound)
 	if (ssp(actor, CLIPMASK0))
 	{
 		if (makesound && (krand() & 255) == 0) S_PlayActorSound(RATTY, actor);
-		actor->spr.__int_angle += (krand() & 31) - 15 + bsin(actor->temp_data[0] << 8, -11);
+		actor->add_int_ang((krand() & 31) - 15 + bsin(actor->temp_data[0] << 8, -11));
 	}
 	else
 	{
@@ -1437,7 +1437,7 @@ bool rat(DDukeActor* actor, bool makesound)
 	}
 	if (actor->spr.xvel < 128)
 		actor->spr.xvel += 2;
-	actor->spr.__int_angle += (krand() & 3) - 6;
+	actor->add_int_ang((krand() & 3) - 6);
 	return true;
 }
 
@@ -1638,7 +1638,7 @@ void recon(DDukeActor *actor, int explosion, int firelaser, int attacksnd, int p
 		actor->temp_data[2]++;
 		if ((actor->temp_data[2] & 3) == 0) spawn(actor, explosion);
 		getglobalz(actor);
-		actor->spr.__int_angle += 96;
+		actor->add_int_ang(96);
 		actor->spr.xvel = 128;
 		int j = ssp(actor, CLIPMASK0);
 		if (j != 1 || actor->spr.pos.Z > actor->floorz)
@@ -1710,7 +1710,7 @@ void recon(DDukeActor *actor, int explosion, int firelaser, int attacksnd, int p
 				fi.shoot(actor, firelaser);
 			}
 		}
-		actor->spr.__int_angle += getincangle(actor->int_ang(), getangle(ps[p].pos.XY() - actor->spr.pos.XY())) >> 2;
+		actor->add_int_ang(getincangle(actor->int_ang(), getangle(ps[p].pos.XY() - actor->spr.pos.XY())) >> 2);
 	}
 
 	if (actor->temp_data[0] != 2 && actor->temp_data[0] != 3 && Owner)
@@ -1770,7 +1770,7 @@ void recon(DDukeActor *actor, int explosion, int firelaser, int attacksnd, int p
 		}
 
 		actor->temp_data[3] = getincangle(actor->int_ang(), a);
-		actor->spr.__int_angle += actor->temp_data[3] >> 3;
+		actor->add_int_ang(actor->temp_data[3] >> 3);
 
         if (actor->spr.pos.Z < Owner->spr.pos.Z - 2)
             actor->spr.pos.Z += 2;
@@ -1984,7 +1984,7 @@ void camera(DDukeActor *actor)
 			if (actor->int_ang() == minimum || actor->int_ang() == maximum)
 			{
 				increment = -increment;
-				actor->spr.__int_angle += increment;
+				actor->add_int_ang(increment);
 			}
 			else if (actor->int_ang() + increment < minimum)
 			{
@@ -1996,7 +1996,7 @@ void camera(DDukeActor *actor)
 			}
 			else
 			{
-				actor->spr.__int_angle += increment;
+				actor->add_int_ang(increment);
 			}
 		}
 	}
@@ -2038,7 +2038,7 @@ void forcesphereexplode(DDukeActor *actor)
 		}
 
 	actor->spr.pos = Owner->spr.pos;;
-	actor->spr.__int_angle += Owner->temp_data[0];
+	actor->add_int_ang(Owner->temp_data[0]);
 
 	if (l > 64) l = 64;
 	else if (l < 1) l = 1;
@@ -2649,7 +2649,7 @@ void handle_se00(DDukeActor* actor)
 			}
 		}
 
-		actor->spr.__int_angle += (l * q);
+		actor->add_int_ang((l * q));
 		actor->temp_data[2] += (l * q);
 	}
 	else
@@ -2668,7 +2668,7 @@ void handle_se00(DDukeActor* actor)
 			actor->temp_data[3] = ldist(actor, Owner);
 		actor->spr.xvel = actor->temp_data[3];
 		actor->copyXY(Owner);
-		actor->spr.__int_angle += (l * q);
+		actor->add_int_ang((l * q));
 		actor->temp_data[2] += (l * q);
 	}
 
@@ -2708,7 +2708,7 @@ void handle_se00(DDukeActor* actor)
 					continue;
 				}
 
-				act2->spr.__int_angle += (l * q);
+				act2->add_int_ang((l * q));
 				act2->spr.__int_angle &= 2047;
 
 				act2->add_int_z(zchange);
@@ -2795,7 +2795,7 @@ void handle_se14(DDukeActor* actor, bool checkstat, int RPG, int JIBS6)
 		int q = getincangle(actor->int_ang(), x) >> 3;
 
 		actor->temp_data[2] += q;
-		actor->spr.__int_angle += q;
+		actor->add_int_ang(q);
 
 		bool statstate = (!checkstat || ((sc->floorstat & CSTAT_SECTOR_SKY) == 0 && (sc->ceilingstat & CSTAT_SECTOR_SKY) == 0));
 		if (actor->spr.xvel == sc->extra)
@@ -2897,7 +2897,7 @@ void handle_se14(DDukeActor* actor, bool checkstat, int RPG, int JIBS6)
 				pos.Y += x;
 				a2->set_int_pos(pos);
 
-				a2->spr.__int_angle += q;
+				a2->add_int_ang(q);
 
 				if (numplayers > 1)
 				{
@@ -2999,7 +2999,7 @@ void handle_se30(DDukeActor *actor, int JIBS6)
 				actor->spr.xvel = 0;
 				operateactivators(actor->spr.hitag + (short)actor->temp_data[3], -1);
 				actor->SetOwner(nullptr);
-				actor->spr.__int_angle += 1024;
+				actor->add_int_ang(1024);
 				actor->temp_data[4] = 0;
 				fi.operateforcefields(actor, actor->spr.hitag);
 			}
@@ -3361,7 +3361,7 @@ void handle_se05(DDukeActor* actor, int FIRELASER)
 
 	x = getangle(Owner->spr.pos.XY() - actor->spr.pos.XY());
 	int q = getincangle(actor->int_ang(), x) >> 3;
-	actor->spr.__int_angle += q;
+	actor->add_int_ang(q);
 
 	if (rnd(32))
 	{
@@ -4327,7 +4327,7 @@ void handle_se27(DDukeActor* actor)
 				{
 					ud.cameraactor = actor;
 					actor->temp_data[0] = 999;
-					actor->spr.__int_angle += getincangle(actor->int_ang(), getangle(ps[p].pos.XY() - actor->spr.pos.XY())) >> 3;
+					actor->add_int_ang(getincangle(actor->int_ang(), getangle(ps[p].pos.XY() - actor->spr.pos.XY())) >> 3);
 					actor->spr.yvel = 100 + int((actor->spr.pos.Z - ps[p].pos.Z) * (256. / 257.));
 
 				}
@@ -4535,7 +4535,7 @@ void handle_se35(DDukeActor *actor, int SMALLSMOKE, int EXPLOSION2)
 	if (sc->int_ceilingz() > actor->int_pos().Z)
 		for (int j = 0; j < 8; j++)
 		{
-			actor->spr.__int_angle += krand() & 511;
+			actor->add_int_ang(krand() & 511);
 			auto spawned = spawn(actor, SMALLSMOKE);
 			if (spawned)
 			{
@@ -4631,7 +4631,7 @@ void handle_se130(DDukeActor *actor, int countmax, int EXPLOSION2)
 		{
 			k->spr.xrepeat = k->spr.yrepeat = 2 + (krand() & 7);
 			k->set_int_z(sc->int_floorz() - (krand() % x));
-			k->spr.__int_angle += 256 - (krand() % 511);
+			k->add_int_ang(256 - (krand() % 511));
 			k->spr.xvel = krand() & 127;
 			ssp(k, CLIPMASK0);
 		}
@@ -5039,7 +5039,7 @@ void alterang(int ang, DDukeActor* actor, int playernum)
 				if (abs(angdif) < 256)
 				{
 					j = 128 - (krand() & 256);
-					actor->spr.__int_angle += j;
+					actor->add_int_ang(j);
 					if (hits(actor) < 844)
 						actor->spr.__int_angle -= j;
 				}
@@ -5047,7 +5047,7 @@ void alterang(int ang, DDukeActor* actor, int playernum)
 			else if (ticselapsed > 18 && ticselapsed < 26) // choose
 			{
 				if (abs(angdif >> 2) < 128) actor->set_int_ang(goalang);
-				else actor->spr.__int_angle += angdif >> 2;
+				else actor->add_int_ang(angdif >> 2);
 			}
 		}
 		else actor->set_int_ang(goalang);
diff --git a/source/games/duke/src/actors_d.cpp b/source/games/duke/src/actors_d.cpp
index 6b18734ec..f7b7ef16a 100644
--- a/source/games/duke/src/actors_d.cpp
+++ b/source/games/duke/src/actors_d.cpp
@@ -485,7 +485,7 @@ int movesprite_ex_d(DDukeActor* actor, int xchange, int ychange, int zchange, un
 			if (dasectp == nullptr) dasectp = &sector[0];
 			return result.setSector(dasectp);
 		}
-		if ((result.type == kHitWall || result.type == kHitSprite) && (actor->cgg == 0)) actor->spr.__int_angle += 768;
+		if ((result.type == kHitWall || result.type == kHitSprite) && (actor->cgg == 0)) actor->add_int_ang(768);
 	}
 	else
 	{
@@ -2382,8 +2382,8 @@ static void greenslime(DDukeActor *actor)
 			if (actor->spr.xvel < 32) actor->spr.xvel += 4;
 			actor->spr.xvel = 64 - bcos(actor->temp_data[1], -9);
 
-			actor->spr.__int_angle += getincangle(actor->int_ang(),
-				getangle(ps[p].pos.XY() - actor->spr.pos.XY())) >> 3;
+			actor->add_int_ang(
+				getincangle(actor->int_ang(), getangle(ps[p].pos.XY() - actor->spr.pos.XY())) >> 3);
 			// TJR
 		}
 
@@ -3513,11 +3513,11 @@ void move_d(DDukeActor *actor, int playernum, int xvel)
 		else goalang = getangle(ps[playernum].pos.XY() - actor->spr.pos.XY());
 		angdif = getincangle(actor->int_ang(), goalang) >> 2;
 		if (angdif > -8 && angdif < 0) angdif = 0;
-		actor->spr.__int_angle += angdif;
+		actor->add_int_ang(angdif);
 	}
 
 	if (a & spin)
-		actor->spr.__int_angle += bsin(actor->temp_data[0] << 3, -6);
+		actor->add_int_ang(bsin(actor->temp_data[0] << 3, -6));
 
 	if (a & face_player_slow)
 	{
@@ -3530,7 +3530,7 @@ void move_d(DDukeActor *actor, int playernum, int xvel)
 			angdif = 0;
 			actor->set_int_ang(goalang);
 		}
-		actor->spr.__int_angle += angdif;
+		actor->add_int_ang(angdif);
 	}
 
 
@@ -3547,7 +3547,7 @@ void move_d(DDukeActor *actor, int playernum, int xvel)
 		goalang = getangle(newx - actor->spr.pos.X, newy - actor->spr.pos.Y);
 		angdif = getincangle(actor->int_ang(), goalang) >> 2;
 		if (angdif > -8 && angdif < 0) angdif = 0;
-		actor->spr.__int_angle += angdif;
+		actor->add_int_ang(angdif);
 	}
 
 	if (actor->temp_data[1] == 0 || a == 0)
diff --git a/source/games/duke/src/actors_r.cpp b/source/games/duke/src/actors_r.cpp
index 30658bbf7..2dac80c87 100644
--- a/source/games/duke/src/actors_r.cpp
+++ b/source/games/duke/src/actors_r.cpp
@@ -401,7 +401,7 @@ int movesprite_ex_r(DDukeActor* actor, int xchange, int ychange, int zchange, un
 			if (dasectp == nullptr) dasectp = &sector[0];
 			return result.setSector(dasectp);
 		}
-		if ((result.type == kHitWall || result.type == kHitSprite) && (actor->cgg == 0)) actor->spr.__int_angle += 768;
+		if ((result.type == kHitWall || result.type == kHitSprite) && (actor->cgg == 0)) actor->add_int_ang(768);
 	}
 	else
 	{
@@ -941,7 +941,7 @@ static void chickenarrow(DDukeActor* actor)
 		if (ang2 < 100)
 		{
 			if (ang3 > 1023)
-				actor->spr.__int_angle += 51;
+				actor->add_int_ang(51);
 			else
 				actor->spr.__int_angle -= 51;
 		}
@@ -950,7 +950,7 @@ static void chickenarrow(DDukeActor* actor)
 			if (ang3 > 1023)
 				actor->spr.__int_angle -= 51;
 			else
-				actor->spr.__int_angle += 51;
+				actor->add_int_ang(51);
 		}
 		else
 			actor->set_int_ang(ang);
@@ -3496,11 +3496,11 @@ void move_r(DDukeActor *actor, int pnum, int xvel)
 		else goalang = getangle(ps[pnum].pos.XY() - actor->spr.pos.XY());
 		angdif = getincangle(actor->int_ang(), goalang) >> 2;
 		if (angdif > -8 && angdif < 0) angdif = 0;
-		actor->spr.__int_angle += angdif;
+		actor->add_int_ang(angdif);
 	}
 
 	if (a & spin)
-		actor->spr.__int_angle += bsin(actor->temp_data[0] << 3, -6);
+		actor->add_int_ang(bsin(actor->temp_data[0] << 3, -6));
 
 	if (a & face_player_slow)
 	{
@@ -3513,7 +3513,7 @@ void move_r(DDukeActor *actor, int pnum, int xvel)
 			angdif = 0;
 			actor->set_int_ang(goalang);
 		}
-		actor->spr.__int_angle += angdif;
+		actor->add_int_ang(angdif);
 	}
 
 	if (isRRRA())
@@ -3529,7 +3529,7 @@ void move_r(DDukeActor *actor, int pnum, int xvel)
 				angdif = 0;
 				actor->set_int_ang(goalang);
 			}
-			actor->spr.__int_angle += angdif;
+			actor->add_int_ang(angdif);
 		}
 
 		if ((a & jumptoplayer) == jumptoplayer)
@@ -3591,7 +3591,7 @@ void move_r(DDukeActor *actor, int pnum, int xvel)
 		goalang = getangle(newx - actor->spr.pos.X, newy - actor->spr.pos.Y);
 		angdif = getincangle(actor->int_ang(), goalang) >> 2;
 		if (angdif > -8 && angdif < 0) angdif = 0;
-		actor->spr.__int_angle += angdif;
+		actor->add_int_ang(angdif);
 	}
 
 	if (actor->temp_data[1] == 0 || a == 0)
diff --git a/source/games/duke/src/gameexec.cpp b/source/games/duke/src/gameexec.cpp
index 8631b27e1..f70e9912c 100644
--- a/source/games/duke/src/gameexec.cpp
+++ b/source/games/duke/src/gameexec.cpp
@@ -1416,14 +1416,14 @@ static int ifcanshoottarget(DDukeActor *actor, int g_p, int g_x)
 				j = 0;
 			else
 			{
-				actor->spr.__int_angle += angdif; j = hitasprite(actor, &hit); actor->spr.__int_angle -= angdif;
+				actor->add_int_ang(angdif); j = hitasprite(actor, &hit); actor->spr.__int_angle -= angdif;
 				if (j > sclip)
 				{
 					if (hit != nullptr && hit->spr.picnum == actor->spr.picnum)
 						j = 0;
 					else
 					{
-						actor->spr.__int_angle -= angdif; j = hitasprite(actor, &hit); actor->spr.__int_angle += angdif;
+						actor->spr.__int_angle -= angdif; j = hitasprite(actor, &hit); actor->add_int_ang(angdif);
 						if (j > 768)
 						{
 							if (hit != nullptr && hit->spr.picnum == actor->spr.picnum)
diff --git a/source/games/duke/src/player_d.cpp b/source/games/duke/src/player_d.cpp
index 3cb670131..ec4bedb52 100644
--- a/source/games/duke/src/player_d.cpp
+++ b/source/games/duke/src/player_d.cpp
@@ -442,7 +442,7 @@ static void shootweapon(DDukeActor *actor, int p, int sx, int sy, int sz, int sa
 					jib->spr.pos.Z += 4;
 					jib->spr.xvel = 16;
 					jib->spr.xrepeat = jib->spr.yrepeat = 24;
-					jib->spr.__int_angle += 64 - (krand() & 127);
+					jib->add_int_ang(64 - (krand() & 127));
 				}
 			}
 			else spawn(spark, SMALLSMOKE);
@@ -651,7 +651,7 @@ static void shootstuff(DDukeActor* actor, int p, int sx, int sy, int sz, int sa,
 				spawned->spr.xvel = 1024;
 				ssp(spawned, CLIPMASK0);
 				spawned->spr.xvel = l;
-				spawned->spr.__int_angle += 128 - (krand() & 255);
+				spawned->add_int_ang(128 - (krand() & 255));
 			}
 		}
 
@@ -770,7 +770,7 @@ static void shootrpg(DDukeActor *actor, int p, int sx, int sy, int sz, int sa, i
 			}
 
 			spawned->add_int_pos({ xoffs, yoffs, 0 });
-			spawned->spr.__int_angle += aoffs;
+			spawned->add_int_ang(aoffs);
 
 			spawned->spr.xrepeat = 42;
 			spawned->spr.yrepeat = 42;
@@ -804,7 +804,7 @@ static void shootrpg(DDukeActor *actor, int p, int sx, int sy, int sz, int sa, i
 	else if ((isWW2GI() && aplWeaponWorksLike(ps[p].curr_weapon, p) == DEVISTATOR_WEAPON) || (!isWW2GI() && ps[p].curr_weapon == DEVISTATOR_WEAPON))
 	{
 		spawned->spr.extra >>= 2;
-		spawned->spr.__int_angle += 16 - (krand() & 31);
+		spawned->add_int_ang(16 - (krand() & 31));
 		spawned->spr.zvel += 256 - (krand() & 511);
 
 		if (ps[p].hbomb_hold_delay)
@@ -2219,7 +2219,7 @@ static void operateweapon(int snum, ESyncBits actions)
 			k = hits(pact);
 			if (k < 512)
 			{
-				spawned->spr.__int_angle += 1024;
+				spawned->add_int_ang(1024);
 				spawned->spr.zvel /= 3;
 				spawned->spr.xvel /= 3;
 			}
@@ -2347,9 +2347,9 @@ static void operateweapon(int snum, ESyncBits actions)
 			auto j = spawn(pact, SHOTGUNSHELL);
 			if (j)
 			{
-				j->spr.__int_angle += 1024;
+				j->add_int_ang(1024);
 				ssp(j, CLIPMASK0);
-				j->spr.__int_angle += 1024;
+				j->add_int_ang(1024);
 			}
 			p->kickback_pic++;
 			break;
@@ -2375,7 +2375,7 @@ static void operateweapon(int snum, ESyncBits actions)
 					auto j = spawn(pact, SHELL);
 					if (j)
 					{
-						j->spr.__int_angle += 1024;
+						j->add_int_ang(1024);
 						j->spr.__int_angle &= 2047;
 						j->spr.xvel += 32;
 						j->spr.pos.Z += 3;
diff --git a/source/games/duke/src/player_r.cpp b/source/games/duke/src/player_r.cpp
index 86058ff8a..0a5727f3b 100644
--- a/source/games/duke/src/player_r.cpp
+++ b/source/games/duke/src/player_r.cpp
@@ -337,7 +337,7 @@ static void shootweapon(DDukeActor* actor, int p, int sx, int sy, int sz, int sa
 					l->spr.pos.Z += 4;
 					l->spr.xvel = 16;
 					l->spr.xrepeat = l->spr.yrepeat = 24;
-					l->spr.__int_angle += 64 - (krand() & 127);
+					l->add_int_ang(64 - (krand() & 127));
 				}
 			}
 			else spawn(spark, SMALLSMOKE);
@@ -717,7 +717,7 @@ static void shootrpg(DDukeActor* actor, int p, int sx, int sy, int sz, int sa, i
 	else if (ps[p].curr_weapon == TIT_WEAPON)
 	{
 		spawned->spr.extra >>= 2;
-		spawned->spr.__int_angle += 16 - (krand() & 31);
+		spawned->add_int_ang(16 - (krand() & 31));
 		spawned->spr.zvel += 256 - (krand() & 511);
 
 		if (ps[p].hbomb_hold_delay)
@@ -2761,7 +2761,7 @@ static void operateweapon(int snum, ESyncBits actions, sectortype* psectp)
 				k = hits(p->GetActor());
 				if (k < 512)
 				{
-					spawned->spr.__int_angle += 1024;
+					spawned->add_int_ang(1024);
 					spawned->spr.zvel /= 3;
 					spawned->spr.xvel /= 3;
 				}
@@ -2977,7 +2977,7 @@ static void operateweapon(int snum, ESyncBits actions, sectortype* psectp)
 					if (j)
 					{
 
-						j->spr.__int_angle += 1024;
+						j->add_int_ang(1024);
 						j->spr.__int_angle &= 2047;
 						j->spr.xvel += 32;
 						j->spr.pos.Z += 3;
diff --git a/source/games/duke/src/player_w.cpp b/source/games/duke/src/player_w.cpp
index a1cdc16de..8d2fb02c8 100644
--- a/source/games/duke/src/player_w.cpp
+++ b/source/games/duke/src/player_w.cpp
@@ -117,15 +117,15 @@ void DoSpawn(player_struct *p, int snum)
 	if((aplWeaponFlags(p->curr_weapon, snum) & WEAPON_FLAG_SPAWNTYPE2 ) )
 	{
 		// like shotgun shells
-		j->spr.__int_angle += 1024;
+		j->add_int_ang(1024);
 		ssp(j,CLIPMASK0);
-		j->spr.__int_angle += 1024;
+		j->add_int_ang(1024);
 //		p->kickback_pic++;
 	}
 	else if((aplWeaponFlags(p->curr_weapon, snum) & WEAPON_FLAG_SPAWNTYPE3 ) )
 	{
 		// like chaingun shells
-		j->spr.__int_angle += 1024;
+		j->add_int_ang(1024);
 		j->spr.__int_angle &= 2047;
 		j->spr.xvel += 32;
 		j->add_int_z(3<<8);
@@ -367,7 +367,7 @@ void operateweapon_ww(int snum, ESyncBits actions)
 				k = hits(p->GetActor());
 				if (k < 512)
 				{
-					j->spr.__int_angle += 1024;
+					j->add_int_ang(1024);
 					j->spr.zvel /= 3;
 					j->spr.xvel /= 3;
 				}
diff --git a/source/games/duke/src/sectors.cpp b/source/games/duke/src/sectors.cpp
index b4f5823b7..b50cc9d2f 100644
--- a/source/games/duke/src/sectors.cpp
+++ b/source/games/duke/src/sectors.cpp
@@ -927,7 +927,7 @@ static void handle_st25(sectortype* sptr, DDukeActor* actor)
 			if (act3->spr.lotag == 15)
 			{
 				act3->sector()->lotag ^= 0x8000; // Toggle the open or close
-				act3->spr.__int_angle += 1024;
+				act3->add_int_ang(1024;
 				if (act3->temp_data[4]) callsound(act3->sector(), act3);
 				callsound(act3->sector(), act3);
 				if (act3->sector()->lotag & 0x8000) act3->temp_data[4] = 1;
diff --git a/source/games/duke/src/sectors_d.cpp b/source/games/duke/src/sectors_d.cpp
index 599273722..fbbf16f02 100644
--- a/source/games/duke/src/sectors_d.cpp
+++ b/source/games/duke/src/sectors_d.cpp
@@ -1190,7 +1190,7 @@ void checkhitsprite_d(DDukeActor* targ, DDukeActor* proj)
 		for (j = 0; j < 48; j++)
 		{
 			fi.shoot(targ, BLOODSPLAT1);
-			targ->spr.__int_angle += 333;
+			targ->add_int_ang(333);
 		}
 		S_PlayActorSound(GLASS_HEAVYBREAK, targ);
 		S_PlayActorSound(SQUISHED, targ);
@@ -1377,7 +1377,7 @@ void checkhitsprite_d(DDukeActor* targ, DDukeActor* proj)
 								spawned->spr.pos.Z += 4;
 								spawned->spr.xvel = 16;
 								spawned->spr.xrepeat = spawned->spr.yrepeat = 24;
-								spawned->spr.__int_angle += 32 - (krand() & 63);
+								spawned->add_int_ang(32 - (krand() & 63));
 							}
 						}
 
diff --git a/source/games/duke/src/sectors_r.cpp b/source/games/duke/src/sectors_r.cpp
index 1adc9189e..23149475b 100644
--- a/source/games/duke/src/sectors_r.cpp
+++ b/source/games/duke/src/sectors_r.cpp
@@ -2333,7 +2333,7 @@ void checkhitsprite_r(DDukeActor* targ, DDukeActor* proj)
 								spawned->spr.pos.Z += 4;
 								spawned->spr.xvel = 16;
 								spawned->spr.xrepeat = spawned->spr.yrepeat = 24;
-								spawned->spr.__int_angle += 32 - (krand() & 63);
+								spawned->add_int_ang(32 - (krand() & 63));
 							}
 						}
 
diff --git a/source/games/exhumed/src/fish.cpp b/source/games/exhumed/src/fish.cpp
index 4f51a7070..d5bd0e1a3 100644
--- a/source/games/exhumed/src/fish.cpp
+++ b/source/games/exhumed/src/fish.cpp
@@ -187,7 +187,7 @@ void BuildFish(DExhumedActor* pActor, int x, int y, int z, sectortype* pSector,
 
 void IdleFish(DExhumedActor* pActor, int edx)
 {
-    pActor->spr.__int_angle += (256 - RandomSize(9)) + 1024;
+    pActor->add_int_ang((256 - RandomSize(9)) + 1024);
     pActor->spr.__int_angle &= kAngleMask;
 
     pActor->spr.xvel = bcos(pActor->int_ang(), -8);
diff --git a/source/games/exhumed/src/queen.cpp b/source/games/exhumed/src/queen.cpp
index 732e7d6b6..f73e94fe8 100644
--- a/source/games/exhumed/src/queen.cpp
+++ b/source/games/exhumed/src/queen.cpp
@@ -624,7 +624,7 @@ void AIQueenEgg::Tick(RunListEvent* ev)
             }
             [[fallthrough]];
         case kHitWall:
-            pActor->spr.__int_angle += (RandomSize(9) + 768);
+            pActor->add_int_ang((RandomSize(9) + 768);
             pActor->spr.__int_angle &= kAngleMask;
             pActor->spr.xvel = bcos(pActor->int_ang(), -3);
             pActor->spr.yvel = bsin(pActor->int_ang(), -3);
@@ -906,7 +906,7 @@ void AIQueenHead::Tick(RunListEvent* ev)
                     runlist_DamageEnemy(pTarget, pActor, 10);
                     D3PlayFX(StaticSound[kSoundQTail] | 0x2000, pActor);
 
-                    pActor->spr.__int_angle += RandomSize(9) + 768;
+                    pActor->add_int_ang(RandomSize(9) + 768);
                     pActor->spr.__int_angle &= kAngleMask;
 
                     pActor->spr.zvel = (-20) - RandomSize(6);
@@ -1303,7 +1303,7 @@ void AIQueen::Tick(RunListEvent* ev)
             }
             [[fallthrough]];
         case 0x8000:
-            pActor->spr.__int_angle += 256;
+            pActor->add_int_ang(256);
             pActor->spr.__int_angle &= kAngleMask;
 
             SetQueenSpeed(pActor, si);
diff --git a/source/games/exhumed/src/scorp.cpp b/source/games/exhumed/src/scorp.cpp
index 450a536c3..200fb8414 100644
--- a/source/games/exhumed/src/scorp.cpp
+++ b/source/games/exhumed/src/scorp.cpp
@@ -410,7 +410,7 @@ void AIScorp::Effect(RunListEvent* ev, DExhumedActor* pTarget, int mode)
     if (mode == 0)
     {
         PlotCourseToSprite(pActor, pTarget);
-        pActor->spr.__int_angle += RandomSize(7) - 63;
+        pActor->add_int_ang(RandomSize(7) - 63);
         pActor->spr.__int_angle &= kAngleMask;
 
         pActor->spr.xvel = bcos(pActor->int_ang());
diff --git a/source/games/exhumed/src/wasp.cpp b/source/games/exhumed/src/wasp.cpp
index 5bf26fc17..074c05f0e 100644
--- a/source/games/exhumed/src/wasp.cpp
+++ b/source/games/exhumed/src/wasp.cpp
@@ -156,7 +156,7 @@ void AIWasp::Damage(RunListEvent* ev)
             }
 
             pActor->nAction = 1;
-            pActor->spr.__int_angle += RandomSize(9) + 768;
+            pActor->add_int_ang(RandomSize(9) + 768);
             pActor->spr.__int_angle &= kAngleMask;
 
             pActor->nVel = 3000;
@@ -304,7 +304,7 @@ void AIWasp::Tick(RunListEvent* ev)
     {
         if (bVal)
         {
-            pActor->spr.__int_angle += RandomSize(9) + 768;
+            pActor->add_int_ang(RandomSize(9) + 768);
             pActor->spr.__int_angle &= kAngleMask;
             pActor->spr.zvel = (-20) - RandomSize(6);
 
diff --git a/source/games/sw/src/bunny.cpp b/source/games/sw/src/bunny.cpp
index 669652eba..f99543471 100644
--- a/source/games/sw/src/bunny.cpp
+++ b/source/games/sw/src/bunny.cpp
@@ -1201,7 +1201,7 @@ DSWActor* BunnyHatch2(DSWActor* actor)
         actorNew->spr.xvel = 150 + RandomRange(1000);
         actorNew->user.Health = 1; // Easy to pop. Like shootn' skeet.
         actorNew->spr.__int_angle -= RandomRange(128);
-        actorNew->spr.__int_angle += RandomRange(128);
+        actorNew->add_int_ang(RandomRange(128));
     }
     else
         PickJumpMaxSpeed(actorNew, -600);
diff --git a/source/games/sw/src/jweapon.cpp b/source/games/sw/src/jweapon.cpp
index be464578d..efd346bf8 100644
--- a/source/games/sw/src/jweapon.cpp
+++ b/source/games/sw/src/jweapon.cpp
@@ -2209,7 +2209,7 @@ int SpawnShell(DSWActor* actor, int ShellNum)
             HelpMissileLateral(actorNew,1500);
             actorNew->set_int_ang(NORM_ANGLE(actorNew->spr.int_ang() - 128));
         }
-        actorNew->spr.__int_angle += (RANDOM_P2(128<<5)>>5) - (128 / 2);
+        actorNew->add_int_ang((RANDOM_P2(128<<5)>>5) - (128 / 2));
         actorNew->set_int_ang(NORM_ANGLE(actorNew->int_ang()));
 
         // Set the shell number
@@ -2223,7 +2223,7 @@ int SpawnShell(DSWActor* actor, int ShellNum)
         actorNew->set_int_ang(NORM_ANGLE(actorNew->spr.int_ang() + 512));
         HelpMissileLateral(actorNew,1300);
         actorNew->set_int_ang(NORM_ANGLE(actorNew->spr.int_ang() - 128 - 64));
-        actorNew->spr.__int_angle += (RANDOM_P2(128<<5)>>5) - (128 / 2);
+        actorNew->add_int_ang((RANDOM_P2(128<<5)>>5) - (128 / 2));
          actorNew->set_int_ang(NORM_ANGLE(actorNew->int_ang()));
 
         // Set the shell number
diff --git a/source/games/sw/src/weapon.cpp b/source/games/sw/src/weapon.cpp
index 346db8182..4f44ee9a5 100644
--- a/source/games/sw/src/weapon.cpp
+++ b/source/games/sw/src/weapon.cpp
@@ -15369,7 +15369,7 @@ int InitTankShell(DSWActor* actor, PLAYER* pp)
 
     WeaponAutoAim(actor, actorNew, 64, false);
     // a bit of randomness
-    actorNew->spr.__int_angle += RandomRange(30) - 15;
+    actorNew->add_int_ang(RandomRange(30) - 15);
     actorNew->set_int_ang(NORM_ANGLE(actorNew->int_ang()));
 
     actorNew->user.change.X = MOVEx(actorNew->spr.xvel, actorNew->int_ang());
@@ -15544,7 +15544,7 @@ int InitTurretFireball(DSWActor* actor, PLAYER* pp)
 
     WeaponAutoAim(actor, actorNew, 64, false);
     // a bit of randomness
-    actorNew->spr.__int_angle += RandomRange(30) - 15;
+    actorNew->add_int_ang(RandomRange(30) - 15);
     actorNew->set_int_ang(NORM_ANGLE(actorNew->int_ang()));
 
     actorNew->user.change.X = MOVEx(actorNew->spr.xvel, actorNew->int_ang());