Introduce Scene class and handling

Co-authored-by: ζeh Matt <5415177+ZehMatt@users.noreply.github.com>

src/openrct2/Context.cpp

@@ -66,6 +66,7 @@
 #include "ride/TrackDesignRepository.h"
 #include "scenario/Scenario.h"
 #include "scenario/ScenarioRepository.h"
+#include "scenes/Scene.h"
 #include "scripting/HookEngine.h"
 #include "scripting/ScriptEngine.h"
 #include "title/TitleScreen.h"
@@ -122,6 +123,9 @@ namespace OpenRCT2
         NetworkBase _network;
 #endif
 
+        // Scenes
+        IScene* _activeScene = nullptr;
+
         // Game states
         std::unique_ptr<TitleScreen> _titleScreen;
 
@@ -305,6 +309,20 @@ namespace OpenRCT2
             return EXIT_FAILURE;
         }
 
+        virtual IScene* GetActiveScene() override
+        {
+            return _activeScene;
+        }
+
+        void SetActiveScene(IScene* screen) override
+        {
+            if (_activeScene != nullptr)
+                _activeScene->Stop();
+            _activeScene = screen;
+            if (_activeScene)
+                _activeScene->Load();
+        }
+
         void WriteLine(const std::string& s) override
         {
             _stdInOutConsole.WriteLine(s);

src/openrct2/Context.h

@@ -84,6 +84,7 @@ namespace OpenRCT2
 
     struct IPlatformEnvironment;
     struct IReplayManager;
+    struct IScene;
 
     namespace Audio
     {
@@ -142,6 +143,10 @@ namespace OpenRCT2
 #ifndef DISABLE_NETWORK
         virtual NetworkBase& GetNetwork() abstract;
 #endif
+
+        virtual IScene* GetActiveScene() abstract;
+        virtual void SetActiveScene(IScene * screen) abstract;
+
         virtual int32_t RunOpenRCT2(int argc, const char** argv) abstract;
 
         virtual bool Initialise() abstract;

src/openrct2/libopenrct2.vcxproj

@@ -511,6 +511,7 @@
     <ClInclude Include="scenario\Scenario.h" />
     <ClInclude Include="scenario\ScenarioRepository.h" />
     <ClInclude Include="scenario\ScenarioSources.h" />
+    <ClInclude Include="scenes\Scene.h" />
     <ClInclude Include="scripting\bindings\entity\ScGuest.hpp" />
     <ClInclude Include="scripting\bindings\entity\ScLitter.hpp" />
     <ClInclude Include="scripting\bindings\entity\ScPeep.hpp" />
@@ -999,6 +1000,7 @@
     <ClCompile Include="scenario\Scenario.cpp" />
     <ClCompile Include="scenario\ScenarioRepository.cpp" />
     <ClCompile Include="scenario\ScenarioSources.cpp" />
+    <ClCompile Include="scenes\Scene.cpp" />
     <ClCompile Include="scripting\bindings\entity\ScGuest.cpp" />
     <ClCompile Include="scripting\bindings\entity\ScLitter.cpp" />
     <ClCompile Include="scripting\bindings\entity\ScStaff.cpp" />

src/openrct2/scenes/Scene.cpp

@@ -0,0 +1,30 @@
+/*****************************************************************************
+ * Copyright (c) 2014-2024 OpenRCT2 developers
+ *
+ * For a complete list of all authors, please refer to contributors.md
+ * Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
+ *
+ * OpenRCT2 is licensed under the GNU General Public License version 3.
+ *****************************************************************************/
+
+#include "Scene.h"
+
+#include "../Context.h"
+#include "../GameState.h"
+
+using namespace OpenRCT2;
+
+Scene::Scene(IContext& context)
+    : _context(context)
+{
+}
+
+IContext& Scene::GetContext()
+{
+    return _context;
+}
+
+GameState_t& Scene::GetGameState()
+{
+    return OpenRCT2::GetGameState();
+}

src/openrct2/scenes/Scene.h

@@ -0,0 +1,44 @@
+/*****************************************************************************
+ * Copyright (c) 2014-2024 OpenRCT2 developers
+ *
+ * For a complete list of all authors, please refer to contributors.md
+ * Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
+ *
+ * OpenRCT2 is licensed under the GNU General Public License version 3.
+ *****************************************************************************/
+
+#pragma once
+
+#include "../common.h"
+
+namespace OpenRCT2
+{
+    struct GameState_t;
+    struct IContext;
+
+    struct IScene
+    {
+    public:
+        virtual ~IScene() = default;
+
+        virtual GameState_t& GetGameState() = 0;
+        virtual IContext& GetContext() = 0;
+
+        virtual void Load() = 0;
+        virtual void Update() = 0;
+        virtual void Stop() = 0;
+    };
+
+    class Scene : public IScene
+    {
+    public:
+        Scene(IContext& context);
+
+        GameState_t& GetGameState() override;
+        IContext& GetContext() override;
+
+    protected:
+        IContext& _context;
+    };
+
+} // namespace OpenRCT2