Patch SPR locks to prevent softlock when opening them from behind.

src/d/actor/d_a_obj_Lv5Key.cpp

@@ -7,6 +7,9 @@
 
 #include "d/actor/d_a_obj_Lv5Key.h"
 #include "d/d_com_inf_game.h"
+#if TARGET_PC
+#include "d/d_map.h"
+#endif
 
 static int useHeapInit(fopAc_ac_c*);
 
@@ -113,6 +116,40 @@ void daObjLv5Key_c::Action() {
 }
 
 void daObjLv5Key_c::Wait(int param_0) {
+#if TARGET_PC
+    if (randomizer_IsActive()) {
+        // Prevent softlock that occurs when opening a locked door from behind.
+        // This patch compares z and x pos depending on yRot and turns the lock to face the player.
+        Vec player_pos = dMapInfo_n::getMapPlayerPos();
+
+        const s32 collisionRotY = shape_angle.y;
+
+        float* playerAxisPos = NULL;
+        float* lockPos = NULL;
+
+        if (collisionRotY & 0x4000) {
+            playerAxisPos = &player_pos.x;
+            lockPos = &current.pos.x;
+        } else {
+            playerAxisPos = &player_pos.z;
+            lockPos = &current.pos.z;
+        }
+
+        bool swapSides = false;
+        if (collisionRotY & 0x8000 && *playerAxisPos > *lockPos + 17.f) {
+            *lockPos += 34.f;
+            swapSides = true;
+        } else if (!(collisionRotY & 0x8000) && *playerAxisPos < *lockPos - 17.f) {
+            *lockPos -= 34.f;
+            swapSides = true;
+        }
+
+        if (swapSides) {
+            shape_angle.y ^= 0x8000;
+            current.angle.y ^= 0x8000;
+        }
+    }
+#endif
     switch (mMode) {
     case -1:
         break;