feat(input): Implement SDL3 input and window management

CMakeLists.txt

@@ -66,6 +66,10 @@ include(cmake/config.cmake)
 include(cmake/gamespy.cmake)
 include(cmake/lzhl.cmake)
 
+if(RTS_SDL3_ENABLE AND NOT IS_VS6_BUILD)
+    include(cmake/sdl3.cmake)
+endif()
+
 if (IS_VS6_BUILD)
     # The original max sdk does not compile against a modern compiler.
     # If there is a desire to make this work, then a fixed max sdk needs to be created.

Core/GameEngine/Include/GameClient/Display.h

@@ -80,6 +80,11 @@ class Display : public SubsystemInterface
 	virtual UnsignedInt getBitDepth() { return m_bitDepth; }
 	virtual void setWindowed( Bool windowed ) { m_windowed = windowed; }  ///< set windowed/fullscreen flag
 	virtual Bool getWindowed() { return m_windowed; }				///< return widowed/fullscreen flag
+
+#if RTS_SDL3_ENABLE
+	virtual Bool getViewportRect( Int& x, Int& y, Int& width, Int& height ) const { return FALSE; }
+#endif
+
 	virtual Bool setDisplayMode( UnsignedInt xres, UnsignedInt yres, UnsignedInt bitdepth, Bool windowed );	///<sets screen resolution/mode
 	virtual Int getDisplayModeCount() {return 0;}	///<return number of display modes/resolutions supported by video card.
 	virtual void getDisplayModeDescription(Int modeIndex, Int *xres, Int *yres, Int *bitDepth) {}	///<return description of mode

Core/GameEngineDevice/CMakeLists.txt

@@ -194,6 +194,18 @@ set(GAMEENGINEDEVICE_SRC
     Source/Win32Device/GameClient/Win32Mouse.cpp
 )
 
+# Add Core-level SDL3 implementation
+if(RTS_SDL3_ENABLE AND NOT IS_VS6_BUILD)
+    list(APPEND GAMEENGINEDEVICE_SRC
+        Include/SDL3GameEngine.h
+        Include/SDL3Device/GameClient/SDL3Input.h
+        Include/SDL3Device/GameClient/SDL3Cursor.h
+        Source/SDL3GameEngine.cpp
+        Source/SDL3Device/GameClient/SDL3Input.cpp
+        Source/SDL3Device/GameClient/SDL3Cursor.cpp
+    )
+endif()
+
 # Add C++ 17 FileSystem implementation for non-VS6 builds
 if(NOT IS_VS6_BUILD)
     list(APPEND GAMEENGINEDEVICE_SRC
@@ -229,6 +241,14 @@ target_link_libraries(corei_gameenginedevice_public INTERFACE
     milesstub
 )
 
+# Export SDL3 dependencies for modern builds
+if(RTS_SDL3_ENABLE AND NOT IS_VS6_BUILD)
+    target_link_libraries(corei_gameenginedevice_public INTERFACE
+        SDL3::SDL3
+        SDL3_image::SDL3_image
+    )
+endif()
+
 if(RTS_BUILD_OPTION_FFMPEG)
     find_package(FFMPEG REQUIRED)
 

Core/GameEngineDevice/Include/SDL3Device/GameClient/SDL3Cursor.h

@@ -0,0 +1,63 @@
+/*
+**	Command & Conquer Generals Zero Hour(tm)
+**	Copyright 2026 TheSuperHackers
+**
+**	This program is free software: you can redistribute it and/or modify
+**	it under the terms of the GNU General Public License as published by
+**	the Free Software Foundation, either version 3 of the License, or
+**	(at your option) any later version.
+**
+**	This program is distributed in the hope that it will be useful,
+**	but WITHOUT ANY WARRANTY; without even the implied warranty of
+**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+**	GNU General Public License for more details.
+**
+**	You should have received a copy of the GNU General Public License
+**	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+// Derived from the GeneralsX branch by fbraz3
+
+#pragma once
+
+#include "Lib/BaseType.h"
+#include <SDL3/SDL.h>
+#include <array>
+
+// USER INCLUDES
+#include "GameClient/Mouse.h"
+
+struct AnimatedCursor
+{
+	SDL_Cursor* m_cursor;
+
+	AnimatedCursor()
+		: m_cursor(nullptr)
+	{}
+	~AnimatedCursor()
+	{
+		if (m_cursor)
+		{
+			SDL_DestroyCursor(m_cursor);
+			m_cursor = nullptr;
+		}
+	}
+
+	SDL_Cursor* getCursor() const { return m_cursor; }
+};
+
+class SDL3CursorManager
+{
+public:
+	static void init();
+	static void shutdown();
+
+	static SDL_Cursor* getCursor(Mouse::MouseCursor cursor, int direction);
+
+	// Internal loader used by Mouse implementation
+	static void initResources(Mouse* mouse);
+
+private:
+	static AnimatedCursor* loadANI(const char* filepath);
+	static AnimatedCursor* m_cursorResources[Mouse::NUM_MOUSE_CURSORS][MAX_2D_CURSOR_DIRECTIONS];
+};

Core/GameEngineDevice/Include/SDL3Device/GameClient/SDL3Input.h

@@ -0,0 +1,184 @@
+/*
+**	Command & Conquer Generals Zero Hour(tm)
+**	Copyright 2026 TheSuperHackers
+**
+**	This program is free software: you can redistribute it and/or modify
+**	it under the terms of the GNU General Public License as published by
+**	the Free Software Foundation, either version 3 of the License, or
+**	(at your option) any later version.
+**
+**	This program is distributed in the hope that it will be useful,
+**	but WITHOUT ANY WARRANTY; without even the implied warranty of
+**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+**	GNU General Public License for more details.
+**
+**	You should have received a copy of the GNU General Public License
+**	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+// Derived from the GeneralsX branch by fbraz3
+
+#pragma once
+
+#include "Lib/BaseType.h"
+
+// SYSTEM INCLUDES
+#include <SDL3/SDL.h>
+#include <array>
+#include <functional>
+
+// USER INCLUDES
+#include "GameClient/Mouse.h"
+#include "GameClient/Keyboard.h"
+#include "GameClient/KeyDefs.h"
+
+// FORWARD REFERENCES
+class SDL3InputManager;
+
+extern SDL3InputManager* TheSDL3InputManager;
+
+typedef KeyDefType KeyVal;
+
+class SDL3Mouse : public Mouse
+{
+public:
+	SDL3Mouse(SDL_Window* window);
+	virtual ~SDL3Mouse(void);
+
+	// SubsystemInterface
+	virtual void init(void) override;
+	virtual void reset(void) override;
+	virtual void update(void) override;
+	virtual void initCursorResources(void) override;
+	static void freeCursorResources(void);
+
+	// Mouse interface
+	virtual void setCursor(MouseCursor cursor) override;
+	virtual void setVisibility(Bool visible) override;
+	virtual void loseFocus() override;
+	virtual void regainFocus() override;
+
+	// SDL3-specific methods
+	void addSDLEvent(SDL_Event* event);
+
+protected:
+	virtual void capture(void) override;
+	virtual void releaseCapture(void) override;
+	virtual UnsignedByte getMouseEvent(MouseIO* result, Bool flush) override;
+
+private:
+	// Event translation from SDL_Event (Clean Slate implementation)
+	void translateEvent(const SDL_Event& event, MouseIO* result);
+
+	// Scale raw SDL window coordinates to game internal resolution
+	void scaleMouseCoordinates(int rawX, int rawY, Uint32 windowID, int& scaledX, int& scaledY);
+
+	SDL_Window* m_Window;
+	Bool m_IsCaptured;
+	Bool m_IsVisible;
+	Bool m_LostFocus;
+
+	Int m_directionFrame;
+
+	float m_accumulatedDeltaX;
+	float m_accumulatedDeltaY;
+
+	SDL_Cursor* m_activeSDLCursor;
+};
+
+class SDL3Keyboard : public Keyboard
+{
+public:
+	SDL3Keyboard(void);
+	virtual ~SDL3Keyboard(void);
+
+	// SubsystemInterface
+	virtual void init(void) override;
+	virtual void reset(void) override;
+	virtual void update(void) override;
+
+	// Keyboard interface
+	virtual Bool getCapsState(void) override;
+
+	// SDL3-specific methods
+	void addSDLEvent(SDL_Event* event);
+
+protected:
+	virtual void getKey(KeyboardIO* key) override;
+	virtual KeyVal translateScanCodeToKeyVal(unsigned char scan);
+
+private:
+	void translateKeyEvent(const SDL_KeyboardEvent& event);
+};
+
+class SDL3InputManager
+{
+public:
+	SDL3InputManager(SDL_Window* window);
+	virtual ~SDL3InputManager();
+
+	void update();
+
+	// Buffer access
+	Bool getNextMouseEvent(SDL_Event& outEvent);
+	Bool getNextKeyboardEvent(SDL_Event& outEvent);
+
+	void addMouseSDLEvent(const SDL_Event& event);
+	void addKeyboardSDLEvent(const SDL_Event& event);
+
+	Bool isQuitting() const { return m_isQuitting; }
+
+	// Constants
+	static constexpr float AXIS_MAX = 32767.0f;
+	static constexpr int TRIGGER_THRESHOLD = 16384;
+	static constexpr float DEFAULT_DEADZONE = 0.15f;
+	static constexpr float DEFAULT_CURSOR_SPEED = 800.0f;
+
+private:
+	struct GamepadState
+	{
+		bool buttonState[SDL_GAMEPAD_BUTTON_COUNT];
+		bool stickLeft, stickRight, stickUp, stickDown;
+		bool ltDown, rtDown;
+
+		GamepadState()
+		{
+			memset(buttonState, 0, sizeof(buttonState));
+			stickLeft = stickRight = stickUp = stickDown = false;
+			ltDown = rtDown = false;
+		}
+	};
+
+private:
+	// Gamepad management
+	void openFirstGamepad();
+	void closeGamepad();
+
+	SDL_Window* m_window;
+	SDL_Gamepad* m_gamepad;
+	void processGamepadInput();
+	void handleGamepadButton(SDL_GamepadButton button, bool& currentState, bool isDown, std::function<void(bool)> action);
+
+	// Virtual event injection
+	void virtualPulseKey(SDL_Scancode scancode, bool down);
+	void virtualPulseMouse(Uint8 button, bool down);
+
+	// Event buffers
+	static const UnsignedInt MAX_MOUSE_EVENTS = 256;
+	static const UnsignedInt MAX_KEY_EVENTS = 256;
+
+	SDL_Event m_mouseEvents[MAX_MOUSE_EVENTS];
+	UnsignedInt m_mouseNextFree;
+	UnsignedInt m_mouseNextGet;
+
+	SDL_Event m_keyEvents[MAX_KEY_EVENTS];
+	UnsignedInt m_keyNextFree;
+	UnsignedInt m_keyNextGet;
+
+	// Gamepad state
+	GamepadState m_state;
+
+	Bool m_precisionMode;
+	Uint64 m_lastUpdateTime;
+	Bool m_isQuitting;
+};

Core/GameEngineDevice/Include/SDL3GameEngine.h

@@ -0,0 +1,87 @@
+/*
+**	Command & Conquer Generals Zero Hour(tm)
+**	Copyright 2026 TheSuperHackers
+**
+**	This program is free software: you can redistribute it and/or modify
+**	it under the terms of the GNU General Public License as published by
+**	the Free Software Foundation, either version 3 of the License, or
+**	(at your option) any later version.
+**
+**	This program is distributed in the hope that it will be useful,
+**	but WITHOUT ANY WARRANTY; without even the implied warranty of
+**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+**	GNU General Public License for more details.
+**
+**	You should have received a copy of the GNU General Public License
+**	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+// Derived from the GeneralsX branch by fbraz3
+
+#pragma once
+
+#include "Lib/BaseType.h"
+
+#include "Common/GameEngine.h"
+#include <SDL3/SDL.h>
+
+// EXTERNALS
+// SDL3 window typically provided by WinMain integration
+extern SDL_Window* TheSDL3Window;
+
+// Forward declarations for base classes
+class AudioManager;
+class Mouse;
+class Keyboard;
+class GameWindow;
+class LocalFileSystem;
+class ArchiveFileSystem;
+class ThingFactory;
+class ModuleFactory;
+class FunctionLexicon;
+class Radar;
+class WebBrowser;
+class ParticleSystemManager;
+
+class SDL3GameEngine : public GameEngine
+{
+public:
+	SDL3GameEngine();
+	virtual ~SDL3GameEngine();
+
+	// GameEngine interface
+	virtual void init(void) override;
+	virtual void reset(void) override;
+	virtual void update(void) override;
+	virtual void serviceWindowsOS(void) override;
+	virtual Bool isActive(void) override;
+	virtual void setIsActive(Bool isActive) override;
+
+	// Factory methods (override GameEngine)
+	virtual LocalFileSystem* createLocalFileSystem(void) override;
+	virtual ArchiveFileSystem* createArchiveFileSystem(void) override;
+	virtual GameLogic* createGameLogic(void) override;
+	virtual GameClient* createGameClient(void) override;
+	virtual ModuleFactory* createModuleFactory(void) override;
+	virtual ThingFactory* createThingFactory(void) override;
+	virtual FunctionLexicon* createFunctionLexicon(void) override;
+	virtual Radar* createRadar(Bool dummy) override;
+	virtual WebBrowser* createWebBrowser(void) override;
+	virtual ParticleSystemManager* createParticleSystemManager(Bool dummy) override;
+	virtual AudioManager* createAudioManager(Bool dummy) override;
+
+	// SDL3 specific
+	virtual SDL_Window* getSDLWindow(void) const { return m_SDLWindow; }
+	virtual void forwardTextInputEvent(const char* utf8Text);
+
+protected:
+	SDL_Window* m_SDLWindow;
+	Bool m_IsInitialized;
+	Bool m_IsActive;
+	Bool m_IsTextInputActive;
+	GameWindow* m_TextInputFocusWindow;
+
+	// Event processing
+	void pollSDL3Events(void);
+	void updateTextInputState(void);
+};