citra/src/input_common/drivers/sdl_driver.h

// SPDX-FileCopyrightText: 2018 Citra Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

#pragma once

#include <atomic>
#include <mutex>
#include <thread>
#include <unordered_map>

#include <SDL.h>

#include "common/common_types.h"
#include "common/threadsafe_queue.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;

namespace InputCommon {

class SDLJoystick;

using ButtonBindings =
    std::array<std::pair<Settings::NativeButton::Values, SDL_GameControllerButton>, 18>;
using ZButtonBindings =
    std::array<std::pair<Settings::NativeButton::Values, SDL_GameControllerAxis>, 2>;

class SDLDriver : public InputEngine {
public:
    /// Initializes and registers SDL device factories
    explicit SDLDriver(std::string input_engine_);

    /// Unregisters SDL device factories and shut them down.
    ~SDLDriver() override;

    void PumpEvents() const;

    /// 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 Common::UUID& guid, int 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;
    Common::Input::ButtonNames 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 IsStickInverted(const Common::ParamPackage& params) override;

    Common::Input::DriverResult SetVibration(
        const PadIdentifier& identifier, const Common::Input::VibrationStatus& vibration) override;

    bool IsVibrationEnabled(const PadIdentifier& identifier) override;

private:
    struct VibrationRequest {
        PadIdentifier identifier;
        Common::Input::VibrationStatus vibration;
    };

    void InitJoystick(int joystick_index);
    void CloseJoystick(SDL_Joystick* sdl_joystick);

    /// Needs to be called before SDL_QuitSubSystem.
    void CloseJoysticks();

    /// Takes all vibrations from the queue and sends the command to the controller
    void SendVibrations();

    Common::ParamPackage BuildAnalogParamPackageForButton(int port, const Common::UUID& guid,
                                                          s32 axis, float value = 0.1f) const;
    Common::ParamPackage BuildButtonParamPackageForButton(int port, const Common::UUID& guid,
                                                          s32 button) const;

    Common::ParamPackage BuildHatParamPackageForButton(int port, const Common::UUID& guid, s32 hat,
                                                       u8 value) const;

    Common::ParamPackage BuildMotionParam(int port, const Common::UUID& guid) const;

    Common::ParamPackage BuildParamPackageForBinding(
        int port, const Common::UUID& 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;

    /// Queue of vibration request to controllers
    Common::SPSCQueue<VibrationRequest> vibration_queue;

    /// Map of GUID of a list of corresponding virtual Joysticks
    std::unordered_map<Common::UUID, std::vector<std::shared_ptr<SDLJoystick>>> joystick_map;
    std::mutex joystick_map_mutex;

    bool start_thread = false;
    std::atomic<bool> initialized = false;

    std::thread vibration_thread;
};
} // namespace InputCommon