Introduce gCurrentRealTimeTicks and refactor some variable names.

src/openrct2-ui/input/MouseInput.cpp

@@ -259,7 +259,7 @@ static void input_scroll_right(int32_t x, int32_t y, int32_t state)
     switch (state)
     {
         case MOUSE_STATE_RELEASED:
-            _ticksSinceDragStart += gTicksSinceLastUpdate;
+            _ticksSinceDragStart += gCurrentDeltaTime;
             if (x != 0 || y != 0)
             {
                 _ticksSinceDragStart = 1000;
@@ -552,7 +552,7 @@ static void input_viewport_drag_continue()
     }
 
     viewport = w->viewport;
-    _ticksSinceDragStart += gTicksSinceLastUpdate;
+    _ticksSinceDragStart += gCurrentDeltaTime;
     if (viewport == nullptr)
     {
         context_show_cursor();
@@ -1479,7 +1479,7 @@ static void input_update_tooltip(rct_window* w, rct_widgetindex widgetIndex, int
             window_tooltip_close();
         }
 
-        gTooltipTimeout += gTicksSinceLastUpdate;
+        gTooltipTimeout += gCurrentDeltaTime;
         if (gTooltipTimeout >= 8000)
         {
             window_close_by_class(WC_TOOLTIP);

src/openrct2/Context.cpp

@@ -110,7 +110,7 @@ namespace OpenRCT2
         bool _isWindowMinimised = false;
         uint32_t _lastTick = 0;
         uint32_t _accumulator = 0;
-        uint32_t _lastUpdateTick = 0;
+        uint32_t _lastUpdateTime = 0;
         bool _variableFrame = false;
 
         // If set, will end the OpenRCT2 game loop. Intentially private to this module so that the flag can not be set back to
@@ -914,13 +914,14 @@ namespace OpenRCT2
 
         void Update()
         {
-            uint32_t currentUpdateTick = platform_get_ticks();
-            gTicksSinceLastUpdate = std::min<uint32_t>(currentUpdateTick - _lastUpdateTick, 500);
-            _lastUpdateTick = currentUpdateTick;
+            uint32_t currentUpdateTime = platform_get_ticks();
+
+            gCurrentDeltaTime = std::min<uint32_t>(currentUpdateTime - _lastUpdateTime, 500);
+            _lastUpdateTime = currentUpdateTime;
 
             if (game_is_not_paused())
             {
-                gPaletteEffectFrame += gTicksSinceLastUpdate;
+                gPaletteEffectFrame += gCurrentDeltaTime;
             }
 
             date_update_real_time_of_day();

src/openrct2/Game.cpp

@@ -65,7 +65,7 @@
 
 #define NUMBER_OF_AUTOSAVES_TO_KEEP 9
 
-uint16_t gTicksSinceLastUpdate;
+uint16_t gCurrentDeltaTime;
 uint8_t gGamePaused = 0;
 int32_t gGameSpeed = 1;
 bool gDoSingleUpdate = false;
@@ -82,6 +82,7 @@ uint8_t gUnk13CA740;
 uint8_t gUnk141F568;
 
 uint32_t gCurrentTicks;
+uint32_t gCurrentRealTimeTicks;
 
 // clang-format off
 GAME_COMMAND_CALLBACK_POINTER * game_command_callback = nullptr;

src/openrct2/Game.h

@@ -137,8 +137,9 @@ extern rct_string_id gErrorStringId;
 extern GAME_COMMAND_POINTER* new_game_command_table[GAME_COMMAND_COUNT];
 
 extern uint32_t gCurrentTicks;
+extern uint32_t gCurrentRealTimeTicks;
 
-extern uint16_t gTicksSinceLastUpdate;
+extern uint16_t gCurrentDeltaTime;
 extern uint8_t gGamePaused;
 extern int32_t gGameSpeed;
 extern bool gDoSingleUpdate;

src/openrct2/GameState.cpp

@@ -91,6 +91,12 @@ void GameState::Update()
         }
     }
 
+    uint32_t realtimeTicksElapsed = gCurrentDeltaTime / GAME_UPDATE_TIME_MS;
+    realtimeTicksElapsed = std::clamp<uint32_t>(realtimeTicksElapsed, 1, GAME_MAX_UPDATES);
+
+    // We use this variable to always advance ticks in normal speed.
+    gCurrentRealTimeTicks += realtimeTicksElapsed;
+
     // Determine how many times we need to update the game
     if (gGameSpeed > 1)
     {
@@ -98,8 +104,7 @@ void GameState::Update()
     }
     else
     {
-        numUpdates = gTicksSinceLastUpdate / GAME_UPDATE_TIME_MS;
-        numUpdates = std::clamp<uint32_t>(numUpdates, 1, GAME_MAX_UPDATES);
+        numUpdates = realtimeTicksElapsed;
     }
 
     if (network_get_mode() == NETWORK_MODE_CLIENT && network_get_status() == NETWORK_STATUS_CONNECTED

src/openrct2/interface/Window.cpp

@@ -133,7 +133,7 @@ void window_update_all()
     // gfx_draw_all_dirty_blocks();
 
     // 1000 tick update
-    gWindowUpdateTicks += gTicksSinceLastUpdate;
+    gWindowUpdateTicks += gCurrentDeltaTime;
     if (gWindowUpdateTicks >= 1000)
     {
         gWindowUpdateTicks = 0;

src/openrct2/localisation/Localisation.Date.cpp

@@ -62,6 +62,7 @@ void date_reset()
     gDateMonthsElapsed = 0;
     gDateMonthTicks = 0;
     gCurrentTicks = 0;
+    gCurrentRealTimeTicks = 0;
 }
 
 void date_set(int32_t year, int32_t month, int32_t day)

src/openrct2/rct2/S6Importer.cpp

@@ -381,6 +381,7 @@ public:
         user_string_clear_all();
         memcpy(gUserStrings, _s6.custom_strings, sizeof(_s6.custom_strings));
         gCurrentTicks = _s6.game_ticks_1;
+        gCurrentRealTimeTicks = 0;
 
         ImportRides();