diff --git a/source/games/duke/src/spawn.cpp b/source/games/duke/src/spawn.cpp
index dae89de67..e546a6c79 100644
--- a/source/games/duke/src/spawn.cpp
+++ b/source/games/duke/src/spawn.cpp
@@ -870,7 +870,7 @@ void spawneffector(DDukeActor* actor, TArray<DDukeActor*>* actors)
 
 		case SE_9_DOWN_OPEN_DOOR_LIGHTS:
 			if (sectp->lotag &&
-				labs(sectp->int_ceilingz() - actor->int_pos().Z) > 1024)
+				abs(sectp->ceilingz - actor->spr.pos.Z) > 4)
 				sectp->lotag |= 32768; //If its open
 			[[fallthrough]];
 		case SE_8_UP_OPEN_DOOR_LIGHTS:
diff --git a/source/games/sw/src/draw.cpp b/source/games/sw/src/draw.cpp
index 6c8b77f61..79a968f17 100644
--- a/source/games/sw/src/draw.cpp
+++ b/source/games/sw/src/draw.cpp
@@ -488,7 +488,7 @@ void DoStarView(tspritetype* tsp, DSWActor* tActor, int viewz)
     extern STATE s_StarStuck[], s_StarDownStuck[];
     int zdiff = viewz - tsp->int_pos().Z;
 
-    if (labs(zdiff) > Z(24))
+    if (abs(zdiff) > Z(24))
     {
         if (tActor->user.StateStart == s_StarStuck)
             tsp->picnum = s_StarDownStuck[tActor->user.State - s_StarStuck].Pic;
@@ -1127,9 +1127,9 @@ void CameraView(PLAYER* pp, int *tx, int *ty, int *tz, sectortype** tsect, DAngl
                     yvect = int(ang.Sin() * 2048.);
 
                     zdiff = actor->int_pos().Z - *tz;
-                    if (labs(actor->int_pos().X - *tx) > 1000)
+                    if (abs(actor->int_pos().X - *tx) > 1000)
                         zvect = Scale(xvect, zdiff, actor->int_pos().X - *tx);
-                    else if (labs(actor->int_pos().Y - *ty) > 1000)
+                    else if (abs(actor->int_pos().Y - *ty) > 1000)
                         zvect = Scale(yvect, zdiff, actor->int_pos().Y - *ty);
                     else if (actor->int_pos().X - *tx != 0)
                         zvect = Scale(xvect, zdiff, actor->int_pos().X - *tx);
diff --git a/source/games/sw/src/input.cpp b/source/games/sw/src/input.cpp
index a386d9cec..fbfd1f141 100644
--- a/source/games/sw/src/input.cpp
+++ b/source/games/sw/src/input.cpp
@@ -186,7 +186,7 @@ void GameInterface::GetInput(ControlInfo* const hidInput, double const scaleAdju
 
         if ((pp->Flags2 & PF2_INPUT_CAN_TURN_VEHICLE))
         {
-            DoPlayerTurnVehicle(pp, input.avel, pp->int_ppos().Z + Z(10), labs(pp->int_ppos().Z + Z(10) - pp->sop->floor_loz));
+            DoPlayerTurnVehicle(pp, input.avel, pp->int_ppos().Z + Z(10), abs(pp->int_ppos().Z + Z(10) - pp->sop->floor_loz));
         }
 
         if ((pp->Flags2 & PF2_INPUT_CAN_TURN_TURRET))
diff --git a/source/games/sw/src/panel.cpp b/source/games/sw/src/panel.cpp
index 41bcaf73a..8cd4f322b 100644
--- a/source/games/sw/src/panel.cpp
+++ b/source/games/sw/src/panel.cpp
@@ -254,7 +254,7 @@ void PlayerUpdateHealth(PLAYER* pp, short value)
         if (pp->Armor && !NoArmor)
         {
             int armor_damage, player_damage;
-            ArmorCalc(labs(value), &armor_damage, &player_damage);
+            ArmorCalc(abs(value), &armor_damage, &player_damage);
             PlayerUpdateArmor(pp, -armor_damage);
             value = -player_damage;
         }
@@ -6317,7 +6317,7 @@ void pWeaponBob(PANEL_SPRITE* psp, short condition)
     }
     else
     {
-        if (labs((psp->sin_ndx & 1023) - 0) < 70)
+        if (abs((psp->sin_ndx & 1023) - 0) < 70)
         {
             psp->flags &= ~(PANF_BOB);
             psp->sin_ndx = (RANDOM_P2(1024) < 512) ? 1024 : 0;
diff --git a/source/games/sw/src/player.cpp b/source/games/sw/src/player.cpp
index 21867768a..2ae962d49 100644
--- a/source/games/sw/src/player.cpp
+++ b/source/games/sw/src/player.cpp
@@ -1175,7 +1175,7 @@ DSWActor* DoPickTarget(DSWActor* actor, uint32_t max_delta_ang, int skip_targets
             angle2 = NORM_ANGLE(getangle(itActor->int_pos().X - actor->int_pos().X, itActor->int_pos().Y - actor->int_pos().Y));
 
             // Get the angle difference
-            // delta_ang = labs(pp->angle.ang.Buildang() - angle2);
+            // delta_ang = abs(pp->angle.ang.Buildang() - angle2);
 
             delta_ang = short(abs(getincangle(angle2, actor->int_ang())));
 
@@ -1855,7 +1855,7 @@ void DoPlayerSlide(PLAYER* pp)
     pp->slide_vect.X  = MulScale(pp->slide_vect.X, PLAYER_SLIDE_FRICTION, 16);
     pp->slide_vect.Y  = MulScale(pp->slide_vect.Y, PLAYER_SLIDE_FRICTION, 16);
 
-    if (labs(pp->slide_vect.X) < 12800 && labs(pp->slide_vect.Y) < 12800)
+    if (abs(pp->slide_vect.X) < 12800 && abs(pp->slide_vect.Y) < 12800)
         pp->slide_vect.X = pp->slide_vect.Y = 0;
 
     push_ret = pushmove(pp->pos, &pp->cursector, ((int)actor->spr.clipdist<<2), pp->p_ceiling_dist, pp->p_floor_dist, CLIPMASK_PLAYER);
@@ -1988,7 +1988,7 @@ void DoPlayerMove(PLAYER* pp)
         pp->vect.Y = (pp->vect.Y + (pp->ovect.Y*2))/3;
     }
 
-    if (labs(pp->vect.X) < 12800 && labs(pp->vect.Y) < 12800)
+    if (abs(pp->vect.X) < 12800 && abs(pp->vect.Y) < 12800)
         pp->vect.X = pp->vect.Y = 0;
 
     actor->set_int_xvel(FindDistance2D(pp->vect.X,pp->vect.Y)>>14);
@@ -2468,9 +2468,9 @@ void DoPlayerMoveVehicle(PLAYER* pp)
 
     if (!Prediction)
     {
-        if (labs(pp->input.fvel|pp->input.svel) && !labs(pp->lastinput.fvel| pp->lastinput.svel))
+        if (abs(pp->input.fvel|pp->input.svel) && !abs(pp->lastinput.fvel| pp->lastinput.svel))
             PlaySOsound(pp->sop->mid_sector,SO_DRIVE_SOUND);
-        else if (!labs(pp->input.fvel|pp->input.svel) && labs(pp->lastinput.fvel| pp->lastinput.svel))
+        else if (!abs(pp->input.fvel|pp->input.svel) && abs(pp->lastinput.fvel| pp->lastinput.svel))
             PlaySOsound(pp->sop->mid_sector,SO_IDLE_SOUND);
     }
 
@@ -2506,7 +2506,7 @@ void DoPlayerMoveVehicle(PLAYER* pp)
         pp->vect.Y = (pp->vect.Y + (pp->ovect.Y*1))/2;
     }
 
-    if (labs(pp->vect.X) < 12800 && labs(pp->vect.Y) < 12800)
+    if (abs(pp->vect.X) < 12800 && abs(pp->vect.Y) < 12800)
         pp->vect.X = pp->vect.Y = 0;
 
     pp->lastcursector = pp->cursector;
@@ -2540,7 +2540,7 @@ void DoPlayerMoveVehicle(PLAYER* pp)
     OperateSectorObject(pp->sop, pp->angle.ang.Buildang(), { MAXSO, MAXSO });
     pp->setcursector(pp->sop->op_main_sector); // for speed
 
-    floor_dist = labs(z - pp->sop->floor_loz);
+    floor_dist = abs(z - pp->sop->floor_loz);
 
 
     if (RectClip)
@@ -3099,7 +3099,7 @@ void DoPlayerClimb(PLAYER* pp)
     pp->vect.Y += ((pp->input.svel*synctics*2)<<6);
     pp->vect.X  = MulScale(pp->vect.X, PLAYER_CLIMB_FRICTION, 16);
     pp->vect.Y  = MulScale(pp->vect.Y, PLAYER_CLIMB_FRICTION, 16);
-    if (labs(pp->vect.X) < 12800 && labs(pp->vect.Y) < 12800)
+    if (abs(pp->vect.X) < 12800 && abs(pp->vect.Y) < 12800)
         pp->vect.X = pp->vect.Y = 0;
 
     climbvel = FindDistance2D(pp->vect.X, pp->vect.Y)>>9;
@@ -3333,7 +3333,7 @@ int DoPlayerWadeSuperJump(PLAYER* pp)
         {
             hit.hitSector = hit.hitWall->nextSector();
 
-            if (hit.hitSector != nullptr && labs(hit.hitSector->int_floorz() - pp->int_ppos().Z) < Z(50))
+            if (hit.hitSector != nullptr && abs(hit.hitSector->int_floorz() - pp->int_ppos().Z) < Z(50))
             {
                 if (Distance(pp->int_ppos().X, pp->int_ppos().Y, hit.int_hitpos().X, hit.int_hitpos().Y) < ((((int)pp->actor->spr.clipdist)<<2) + 256))
                     return true;
@@ -3381,7 +3381,7 @@ bool PlayerFallTest(PLAYER* pp, double player_height)
     {
         // if on a STEEP slope sector and you have not moved off of the sector
         if (pp->lo_sectp &&
-            labs(pp->lo_sectp->floorheinum) > 3000 &&
+            abs(pp->lo_sectp->floorheinum) > 3000 &&
             (pp->lo_sectp->floorstat & CSTAT_SECTOR_SLOPE) &&
             pp->lo_sectp == pp->lastcursector)
         {
diff --git a/source/games/sw/src/rooms.cpp b/source/games/sw/src/rooms.cpp
index bb8642d5f..436ab47a4 100644
--- a/source/games/sw/src/rooms.cpp
+++ b/source/games/sw/src/rooms.cpp
@@ -205,7 +205,7 @@ FAFhitscan(int32_t x, int32_t y, int32_t z, sectortype* sect,
                 plax_found = true;
             }
         }
-        else if (labs(hit.int_hitpos().Z - hiz) < Z(4))
+        else if (abs(hit.int_hitpos().Z - hiz) < Z(4))
         {
             if (FAF_ConnectCeiling(hit.hitSector) && !(hit.hitSector->floorstat & CSTAT_SECTOR_FAF_BLOCK_HITSCAN))
             {
@@ -273,7 +273,7 @@ bool FAFcansee_(int32_t xs, int32_t ys, int32_t zs, sectortype* sects,
     if (hit.hitWall == nullptr && hit.actor() == nullptr)
     {
         getzsofslopeptr(hit.hitSector, hit.int_hitpos().X, hit.int_hitpos().Y, &hiz, &loz);
-        if (labs(hit.int_hitpos().Z - loz) < Z(4))
+        if (abs(hit.int_hitpos().Z - loz) < Z(4))
         {
             if (FAF_ConnectFloor(hit.hitSector))
             {
@@ -281,7 +281,7 @@ bool FAFcansee_(int32_t xs, int32_t ys, int32_t zs, sectortype* sects,
                 plax_found = true;
             }
         }
-        else if (labs(hit.int_hitpos().Z - hiz) < Z(4))
+        else if (abs(hit.int_hitpos().Z - hiz) < Z(4))
         {
             if (FAF_ConnectCeiling(hit.hitSector))
             {
diff --git a/source/games/sw/src/rotator.cpp b/source/games/sw/src/rotator.cpp
index 0dff082fe..1e4da295d 100644
--- a/source/games/sw/src/rotator.cpp
+++ b/source/games/sw/src/rotator.cpp
@@ -301,7 +301,7 @@ int DoRotator(DSWActor* actor)
             // new tgt is OPEN (open)
             r->tgt = r->open_dest;
             r->speed = r->orig_speed;
-            r->vel = labs(r->vel);
+            r->vel = abs(r->vel);
 
             SetRotatorInactive(actor);
 
diff --git a/source/games/sw/src/slidor.cpp b/source/games/sw/src/slidor.cpp
index 234032473..708ce86e2 100644
--- a/source/games/sw/src/slidor.cpp
+++ b/source/games/sw/src/slidor.cpp
@@ -470,7 +470,7 @@ int DoSlidor(DSWActor* actor)
 
             // new tgt is OPEN (open)
             r->speed = r->orig_speed;
-            r->vel = labs(r->vel);
+            r->vel = abs(r->vel);
 
             r->tgt = r->open_dest;
             SetSlidorInactive(actor);
diff --git a/source/games/sw/src/sounds.cpp b/source/games/sw/src/sounds.cpp
index 9f164e5ca..80bad59b7 100644
--- a/source/games/sw/src/sounds.cpp
+++ b/source/games/sw/src/sounds.cpp
@@ -166,7 +166,7 @@ FRolloffInfo GetRolloff(int basedist)
     if (basedist < 0) // if basedist is negative
     {
         double decayshift = 2;
-        int decay = labs(basedist) / DECAY_CONST;
+        int decay = abs(basedist) / DECAY_CONST;
 
         for (int i = 0; i < decay; i++)
             decayshift *= 2;
diff --git a/source/games/sw/src/sprite.cpp b/source/games/sw/src/sprite.cpp
index 734f8fa71..824fd8d6b 100644
--- a/source/games/sw/src/sprite.cpp
+++ b/source/games/sw/src/sprite.cpp
@@ -1508,7 +1508,7 @@ void SpriteSetupPost(void)
                 continue;
 
             getzsofslopeptr(jActor->sector(), jActor->int_pos().X, jActor->int_pos().Y, &cz, &fz);
-            if (labs(jActor->int_pos().Z - fz) > Z(4))
+            if (abs(jActor->int_pos().Z - fz) > Z(4))
                 continue;
 
             SpawnUser(jActor, 0, nullptr);
diff --git a/source/games/sw/src/track.cpp b/source/games/sw/src/track.cpp
index c4cafc48a..f7bf2d86e 100644
--- a/source/games/sw/src/track.cpp
+++ b/source/games/sw/src/track.cpp
@@ -2964,7 +2964,7 @@ bool ActorTrackDecide(TRACK_POINT* tpoint, DSWActor* actor)
                 if (!hit.hitWall->twoSided())
                     return false;
 
-                zdiff = labs(actor->int_pos().Z - hit.hitWall->nextSector()->int_floorz()) >> 8;
+                zdiff = abs(actor->int_pos().Z - hit.hitWall->nextSector()->int_floorz()) >> 8;
 
                 actor->user.jump_speed = PickJumpSpeed(actor, zdiff);
             }
diff --git a/source/games/sw/src/weapon.cpp b/source/games/sw/src/weapon.cpp
index 5e61ce053..54d93c42a 100644
--- a/source/games/sw/src/weapon.cpp
+++ b/source/games/sw/src/weapon.cpp
@@ -4145,7 +4145,7 @@ int SpawnBlood(DSWActor* actor, DSWActor* weapActor, DAngle hit_angle, const DVe
 			UpdateChangeXY(actorNew);
 
             // for FastShrap
-            actorNew->user.set_int_change_z(abs(actorNew->user.jump_speed*4) - RandomRange(labs(actorNew->user.jump_speed)*8));
+            actorNew->user.set_int_change_z(abs(actorNew->user.jump_speed*4) - RandomRange(abs(actorNew->user.jump_speed)*8));
             actorNew->user.WaitTics = 64 + RANDOM_P2(32);
 
             actor->user.Flags |= (SPR_BOUNCE);
@@ -15986,7 +15986,7 @@ int InitMine(PLAYER* pp)
     dot = DOT_PRODUCT_2D(pp->vect.X, pp->vect.Y, pp->angle.ang.Cos() * (1 << 14), pp->angle.ang.Sin() * (1 << 14));
 
     // don't adjust for strafing
-    if (labs(dot) > 10000)
+    if (abs(dot) > 10000)
     {
         // adjust xvel according to player velocity
         actorNew->user.add_int_change_x(pp->vect.X>>13);