input_common: Rewrite SDL

src/input_common/drivers/sdl_driver.h

@@ -0,0 +1,120 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <atomic>
+#include <mutex>
+#include <thread>
+#include <unordered_map>
+
+#include <SDL.h>
+
+#include "common/common_types.h"
+#include "input_common/input_engine.h"
+
+union SDL_Event;
+using SDL_GameController = struct _SDL_GameController;
+using SDL_Joystick = struct _SDL_Joystick;
+using SDL_JoystickID = s32;
+
+using ButtonBindings =
+    std::array<std::pair<Settings::NativeButton::Values, SDL_GameControllerButton>, 17>;
+using ZButtonBindings =
+    std::array<std::pair<Settings::NativeButton::Values, SDL_GameControllerAxis>, 2>;
+
+namespace InputCommon {
+
+class SDLJoystick;
+
+class SDLDriver : public InputCommon::InputEngine {
+public:
+    /// Initializes and registers SDL device factories
+    SDLDriver(const std::string& input_engine_);
+
+    /// Unregisters SDL device factories and shut them down.
+    ~SDLDriver() override;
+
+    /// Handle SDL_Events for joysticks from SDL_PollEvent
+    void HandleGameControllerEvent(const SDL_Event& event);
+
+    /// Get the nth joystick with the corresponding GUID
+    std::shared_ptr<SDLJoystick> GetSDLJoystickBySDLID(SDL_JoystickID sdl_id);
+
+    /**
+     * Check how many identical joysticks (by guid) were connected before the one with sdl_id and so
+     * tie it to a SDLJoystick with the same guid and that port
+     */
+    std::shared_ptr<SDLJoystick> GetSDLJoystickByGUID(const std::string& guid, int port);
+
+    std::vector<Common::ParamPackage> GetInputDevices() const override;
+
+    ButtonMapping GetButtonMappingForDevice(const Common::ParamPackage& params) override;
+    AnalogMapping GetAnalogMappingForDevice(const Common::ParamPackage& params) override;
+    MotionMapping GetMotionMappingForDevice(const Common::ParamPackage& params) override;
+    std::string GetUIName(const Common::ParamPackage& params) const override;
+
+    std::string GetHatButtonName(u8 direction_value) const override;
+    u8 GetHatButtonId(const std::string direction_name) const override;
+
+    bool SetRumble(const PadIdentifier& identifier,
+                   const Input::VibrationStatus vibration) override;
+
+private:
+    void InitJoystick(int joystick_index);
+    void CloseJoystick(SDL_Joystick* sdl_joystick);
+
+    /// Needs to be called before SDL_QuitSubSystem.
+    void CloseJoysticks();
+
+    Common::ParamPackage BuildAnalogParamPackageForButton(int port, std::string guid, s32 axis,
+                                                          float value = 0.1f) const;
+    Common::ParamPackage BuildButtonParamPackageForButton(int port, std::string guid,
+                                                          s32 button) const;
+
+    Common::ParamPackage BuildHatParamPackageForButton(int port, std::string guid, s32 hat,
+                                                       u8 value) const;
+
+    Common::ParamPackage BuildMotionParam(int port, std::string guid) const;
+
+    Common::ParamPackage BuildParamPackageForBinding(
+        int port, const std::string& guid, const SDL_GameControllerButtonBind& binding) const;
+
+    Common::ParamPackage BuildParamPackageForAnalog(PadIdentifier identifier, int axis_x,
+                                                    int axis_y, float offset_x,
+                                                    float offset_y) const;
+
+    /// Returns the default button bindings list for generic controllers
+    ButtonBindings GetDefaultButtonBinding() const;
+
+    /// Returns the default button bindings list for nintendo controllers
+    ButtonBindings GetNintendoButtonBinding(const std::shared_ptr<SDLJoystick>& joystick) const;
+
+    /// Returns the button mappings from a single controller
+    ButtonMapping GetSingleControllerMapping(const std::shared_ptr<SDLJoystick>& joystick,
+                                             const ButtonBindings& switch_to_sdl_button,
+                                             const ZButtonBindings& switch_to_sdl_axis) const;
+
+    /// Returns the button mappings from two different controllers
+    ButtonMapping GetDualControllerMapping(const std::shared_ptr<SDLJoystick>& joystick,
+                                           const std::shared_ptr<SDLJoystick>& joystick2,
+                                           const ButtonBindings& switch_to_sdl_button,
+                                           const ZButtonBindings& switch_to_sdl_axis) const;
+
+    /// Returns true if the button is on the left joycon
+    bool IsButtonOnLeftSide(Settings::NativeButton::Values button) const;
+
+    // Set to true if SDL supports game controller subsystem
+    bool has_gamecontroller = false;
+
+    /// Map of GUID of a list of corresponding virtual Joysticks
+    std::unordered_map<std::string, std::vector<std::shared_ptr<SDLJoystick>>> joystick_map;
+    std::mutex joystick_map_mutex;
+
+    bool start_thread = false;
+    std::atomic<bool> initialized = false;
+
+    std::thread poll_thread;
+};
+} // namespace InputCommon