From db8a53e7d45f43a34d5522e33dca2c3c6ab80c99 Mon Sep 17 00:00:00 2001
From: Mitchell Richters <mjr4077au@gmail.com>
Date: Mon, 2 Jan 2023 11:53:10 +1100
Subject: [PATCH] - SW: Add inertia correction to `PlayerWarpUpdatePos()`.

* Warping between sectors such as the clouds in $volcano now maintains perfect velocity, etc.
---
 source/games/sw/src/player.cpp | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/source/games/sw/src/player.cpp b/source/games/sw/src/player.cpp
index 24b05f42b..8bc6b1d65 100644
--- a/source/games/sw/src/player.cpp
+++ b/source/games/sw/src/player.cpp
@@ -166,7 +166,7 @@ void DoPlayerDeathExplode(PLAYER* pp);
 void DoPlayerDeathFall(PLAYER* pp);
 
 void PlayerCheckValidMove(PLAYER* pp);
-void PlayerWarpUpdatePos(PLAYER* pp);
+void PlayerWarpUpdatePos(PLAYER* pp, const DVector3& oldpos);
 void DoPlayerBeginDiveNoWarp(PLAYER* pp);
 int PlayerCanDiveNoWarp(PLAYER* pp);
 void DoPlayerCurrent(PLAYER* pp);
@@ -2222,12 +2222,15 @@ void DoPlayerMove(PLAYER* pp)
     }
 
     // check for warp - probably can remove from CeilingHit
+    const auto oldpos = pp->pos;
     if (WarpPlane(pp->pos, &pp->cursector))
     {
-        PlayerWarpUpdatePos(pp);
+        PlayerWarpUpdatePos(pp, oldpos);
+    }
+    else
+    {
+        DoPlayerZrange(pp);
     }
-
-    DoPlayerZrange(pp);
 
     //PlayerSectorBound(pp, 1);
 
@@ -3500,9 +3503,10 @@ void DoPlayerClimb(PLAYER* pp)
         LadderUpdate = true;
     }
 
+    const auto oldpos = pp->pos;
     if (WarpPlane(pp->pos, &pp->cursector))
     {
-        PlayerWarpUpdatePos(pp);
+        PlayerWarpUpdatePos(pp, oldpos);
         LadderUpdate = true;
     }
 
@@ -3750,12 +3754,12 @@ void DoPlayerBeginFly(PLAYER* pp)
 //
 //---------------------------------------------------------------------------
 
-void PlayerWarpUpdatePos(PLAYER* pp)
+void PlayerWarpUpdatePos(PLAYER* pp, const DVector3& oldpos)
 {
     if (Prediction)
         return;
 
-    pp->opos = pp->pos;
+    pp->opos += pp->pos - oldpos;
     DoPlayerZrange(pp);
     UpdatePlayerSprite(pp);
 }