Rewrite streaming code to C++ and forklift most of the setup out of the GUI code

app/streaming/input.hpp

@@ -0,0 +1,50 @@
+#pragma once
+
+#include <SDL.h>
+
+struct GamepadState {
+    SDL_GameController* controller;
+    SDL_JoystickID jsId;
+    short index;
+
+    short buttons;
+    short lsX, lsY;
+    short rsX, rsY;
+    unsigned char lt, rt;
+};
+
+#define MAX_GAMEPADS 4
+
+class SdlInputHandler
+{
+public:
+    explicit SdlInputHandler(bool multiController);
+
+    void handleKeyEvent(SDL_KeyboardEvent* event);
+
+    void handleMouseButtonEvent(SDL_MouseButtonEvent* event);
+
+    void handleMouseMotionEvent(SDL_MouseMotionEvent* event);
+
+    void handleMouseWheelEvent(SDL_MouseWheelEvent* event);
+
+    void handleControllerAxisEvent(SDL_ControllerAxisEvent* event);
+
+    void handleControllerButtonEvent(SDL_ControllerButtonEvent* event);
+
+    void handleControllerDeviceEvent(SDL_ControllerDeviceEvent* event);
+
+    int getAttachedGamepadMask();
+
+private:
+    GamepadState*
+    findStateForGamepad(SDL_JoystickID id);
+
+    void sendGamepadState(GamepadState* state);
+
+    bool m_MultiController;
+    int m_GamepadMask;
+    GamepadState m_GamepadState[MAX_GAMEPADS];
+
+    static const int k_ButtonMap[];
+};