Teleportationstrank: the running campaign's portal list

In the Underworld the potion opens the Underworld portals (busy dialog mode
6, as the teleporters there do); g_campaign moved to game/addresses.h.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/teleport-potion.md

@@ -32,3 +32,11 @@ one of them.
 - The potion is used up (flag, RemoveItem, DestroyObject as UseItem does; a
   stack loses one) only when cCreature::Teleport is called from the portal
   case while it is pending; closing the window keeps it.
+
+## Campaign (2026-10-21)
+
+The potion showed Ancaria's portals in the Underworld. cInterpretSQW::Teleporter
+(0x4ae330) chooses the busy dialog's mode by the portal touched: index > 0xd
+(Underworld) mode 6, else mode 5, both with the hero's known-portal mask
+(+0x578). The potion now chooses by the running campaign, g_campaign
+(0x182cdc8, u16: 0 Ancaria, 1 Underworld): mode 6 in the Underworld.

src/game/addresses.h

@@ -28,6 +28,7 @@ constexpr uint32_t WorldToScreen = 0x00623c40;
 // --- globals -----------------------------------------------------------------
 constexpr uint32_t g_dxDriver = 0x00cda99c;  // DxDriver7*
 constexpr uint32_t g_appFlags = 0x0182cdb8;  // uint32_t, 0x20000 = inactive
+constexpr uint32_t g_campaign = 0x0182cdc8;  // uint16_t, the running game's campaign: 0 Ancaria, 1 Underworld
 constexpr uint32_t g_mouseCursor = 0x00cdbadc;  // mouse cursor object*: x +4, y +8 (render pixels)
 
 // --- read-only constants -----------------------------------------------------

src/mods/characters.cpp

@@ -43,6 +43,7 @@
 
 #include <windows.h>
 
+#include "game/addresses.h"
 #include "game/engine/events.h"
 #include "game/engine/objects.h"
 #include "game/ui/draw.h"
@@ -102,7 +103,7 @@ constexpr uintptr_t kGameLevel = 0x0182cdc4;  // g_gameLevel: the difficulty of
 // g_campaign (u16): the campaign of the game to start / running. The main menu
 // sets it by entry (0x712180..), cEngine::Load from the save header; the load
 // window lists only saves of it (0x71e2b9).
-constexpr uintptr_t kCampaign = 0x0182cdc8;
+constexpr uintptr_t kCampaign = game::addr::g_campaign;
 constexpr size_t kSessionSinglePlayer = 0x14;  // set to 1 by both
 constexpr size_t kSessionHeroClass = 0x44;     // the start hero's class (Session::SetHeroClass 0x7d7cf0)
 // cCommand_armaPlay (vtable 0x894ff4): execute (0x755ac0) posts 0x8002 (mode,

src/mods/teleportpotion.cpp

@@ -8,7 +8,8 @@
 // whose tooltip names the potion too). Touching a teleporter runs
 // cInterpretSQW::Teleporter (0x4ae330): it adds the portal to the hero's known ones (bit mask at hero +0x578) and posts
 // a UI event (type 0x39) to DEFAULT_BUSYDLG with +8 = 2, +0xc = 5 (portal
-// mode; 6 for the underworld portals above 0xd) and +0x10 = the mask;
+// mode; 6 for the underworld portals above 0xd, the same mask) and +0x10 =
+// the mask;
 // cUI_BusyDlg::HandleEvent (0x720c10) then calls SetMode (0x720180, (mode, a,
 // b), ret 0xc). Choosing a portal sends the engine an event whose case
 // (0x619671, "EE_USEPORTAL") teleports the hero with cCreature::Teleport
@@ -26,11 +27,13 @@
 #include <string>
 #include <vector>
 
+#include "game/addresses.h"
 #include "game/engine/events.h"
 #include "game/engine/items.h"
 #include "game/engine/objects.h"
 #include "game/engine/orders.h"
 #include "game/ui/texts.h"
+#include "mods/charfile.h"
 #include "mods/skillslots.h"
 #include "re/hook.h"
 #include "re/log.h"
@@ -55,7 +58,8 @@ constexpr uint32_t kUiEventBusyDialog = 0x39;
 constexpr uintptr_t kBusyDialogName = 0x0094d700;  // "DEFAULT_BUSYDLG"
 constexpr uintptr_t kNoSender = 0x00aa24bc;  // the game's empty name
 constexpr uint32_t kBusyDialogSetMode = 2;
-constexpr uint32_t kBusyModePortals = 5;
+constexpr uint32_t kBusyModePortals = 5;  // Ancaria's portals
+constexpr uint32_t kBusyModeUnderworldPortals = 6;
 constexpr size_t kUiEventSize = 0x80;
 constexpr size_t kUiEventString = 0x68;
 
@@ -65,6 +69,13 @@ constexpr uintptr_t kPortalTeleportReturn = 0x006197c8;
 constexpr size_t kControlFlags = 0x10;
 constexpr uint32_t kControlVisible = 1;
 
+// The portal list of the running campaign (user, 2026-10-21: the potion
+// showed Ancaria's portals in the Underworld), as the teleporters choose it.
+uint32_t PortalMode() {
+    const uint16_t campaign = *reinterpret_cast<const uint16_t*>(game::addr::g_campaign);
+    return campaign == characters::kCampaignUnderworld ? kBusyModeUnderworldPortals : kBusyModePortals;
+}
+
 // The potion that opened the portal window, until it is used or the window
 // closes; and the dialog, once it showed for it.
 uint32_t g_pending = 0;
@@ -77,7 +88,7 @@ void OpenPortalWindow(uint32_t knownPortals) {
                                       uint32_t, uint32_t, uint32_t);
     reinterpret_cast<CtorFn>(0x00553080)(event, nullptr, kUiEventBusyDialog, reinterpret_cast<const char*>(kBusyDialogName),
                                          reinterpret_cast<const char*>(kNoSender),
-                                         kBusyDialogSetMode, kBusyModePortals, knownPortals, 0, 0, 0);
+                                         kBusyDialogSetMode, PortalMode(), knownPortals, 0, 0, 0);
     game::PostEvent(event);
     using FreeFn = void(__fastcall*)(void*, void*);
     reinterpret_cast<FreeFn>(0x006e85d0)(event + kUiEventString, nullptr);
@@ -162,7 +173,7 @@ void __fastcall BusyDlg_SetMode(void* self, void* edx, uint32_t mode, uint32_t a
     using namespace mods::teleportpotion;
     if (g_pending) {
         g_dialog = static_cast<uint8_t*>(self);
-        if (mode != kBusyModePortals) {
+        if (mode != kBusyModePortals && mode != kBusyModeUnderworldPortals) {
             g_pending = 0;
         }
     }