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	InputCommon: add SDL joystick support
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				@ -10,8 +10,18 @@ set(HEADERS
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            main.h
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            )
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if(SDL2_FOUND)
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    set(SRCS ${SRCS} sdl/sdl.cpp)
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    set(HEADERS ${HEADERS} sdl/sdl.h)
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    include_directories(${SDL2_INCLUDE_DIR})
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endif()
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create_directory_groups(${SRCS} ${HEADERS})
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add_library(input_common STATIC ${SRCS} ${HEADERS})
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target_link_libraries(input_common common core)
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if(SDL2_FOUND)
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    target_link_libraries(input_common ${SDL2_LIBRARY})
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    set_property(TARGET input_common APPEND PROPERTY COMPILE_DEFINITIONS HAVE_SDL2)
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endif()
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@ -7,6 +7,9 @@
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#include "input_common/analog_from_button.h"
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#include "input_common/keyboard.h"
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#include "input_common/main.h"
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#ifdef HAVE_SDL2
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#include "input_common/sdl/sdl.h"
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#endif
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namespace InputCommon {
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@ -17,12 +20,19 @@ void Init() {
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    Input::RegisterFactory<Input::ButtonDevice>("keyboard", keyboard);
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    Input::RegisterFactory<Input::AnalogDevice>("analog_from_button",
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                                                std::make_shared<InputCommon::AnalogFromButton>());
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#ifdef HAVE_SDL2
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    SDL::Init();
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#endif
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}
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void Shutdown() {
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    Input::UnregisterFactory<Input::ButtonDevice>("keyboard");
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    keyboard.reset();
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    Input::UnregisterFactory<Input::AnalogDevice>("analog_from_button");
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#ifdef HAVE_SDL2
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    SDL::Shutdown();
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#endif
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}
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Keyboard* GetKeyboard() {
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										202
									
								
								src/input_common/sdl/sdl.cpp
									
									
									
									
									
										Normal file
									
								
							
							
						
						
									
										202
									
								
								src/input_common/sdl/sdl.cpp
									
									
									
									
									
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							@ -0,0 +1,202 @@
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// Copyright 2017 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <cmath>
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#include <memory>
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#include <string>
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#include <tuple>
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#include <unordered_map>
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#include <SDL.h>
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#include "common/math_util.h"
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#include "input_common/sdl/sdl.h"
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namespace InputCommon {
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namespace SDL {
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class SDLJoystick;
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class SDLButtonFactory;
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class SDLAnalogFactory;
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static std::unordered_map<int, std::weak_ptr<SDLJoystick>> joystick_list;
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static std::shared_ptr<SDLButtonFactory> button_factory;
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static std::shared_ptr<SDLAnalogFactory> analog_factory;
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static bool initialized = false;
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class SDLJoystick {
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public:
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    explicit SDLJoystick(int joystick_index)
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        : joystick{SDL_JoystickOpen(joystick_index), SDL_JoystickClose} {
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        if (!joystick) {
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            LOG_ERROR(Input, "failed to open joystick %d", joystick_index);
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        }
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    }
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    bool GetButton(int button) const {
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        if (!joystick)
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            return {};
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        SDL_JoystickUpdate();
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        return SDL_JoystickGetButton(joystick.get(), button) == 1;
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    }
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    std::tuple<float, float> GetAnalog(int axis_x, int axis_y) const {
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        if (!joystick)
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            return {};
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        SDL_JoystickUpdate();
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        float x = SDL_JoystickGetAxis(joystick.get(), axis_x) / 32767.0f;
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        float y = SDL_JoystickGetAxis(joystick.get(), axis_y) / 32767.0f;
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        y = -y; // 3DS uses an y-axis inverse from SDL
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        // Make sure the coordinates are in the unit circle,
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        // otherwise normalize it.
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        float r = x * x + y * y;
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        if (r > 1.0f) {
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            r = std::sqrt(r);
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            x /= r;
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            y /= r;
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        }
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        return std::make_tuple(x, y);
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    }
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    bool GetHatDirection(int hat, Uint8 direction) const {
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        return (SDL_JoystickGetHat(joystick.get(), hat) & direction) != 0;
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    }
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private:
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    std::unique_ptr<SDL_Joystick, decltype(&SDL_JoystickClose)> joystick;
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};
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class SDLButton final : public Input::ButtonDevice {
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public:
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    explicit SDLButton(std::shared_ptr<SDLJoystick> joystick_, int button_)
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        : joystick(joystick_), button(button_) {}
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    bool GetStatus() const override {
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        return joystick->GetButton(button);
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    }
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private:
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    std::shared_ptr<SDLJoystick> joystick;
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    int button;
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};
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class SDLDirectionButton final : public Input::ButtonDevice {
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public:
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    explicit SDLDirectionButton(std::shared_ptr<SDLJoystick> joystick_, int hat_, Uint8 direction_)
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        : joystick(joystick_), hat(hat_), direction(direction_) {}
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    bool GetStatus() const override {
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        return joystick->GetHatDirection(hat, direction);
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    }
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private:
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    std::shared_ptr<SDLJoystick> joystick;
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    int hat;
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    Uint8 direction;
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};
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class SDLAnalog final : public Input::AnalogDevice {
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public:
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    SDLAnalog(std::shared_ptr<SDLJoystick> joystick_, int axis_x_, int axis_y_)
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        : joystick(joystick_), axis_x(axis_x_), axis_y(axis_y_) {}
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    std::tuple<float, float> GetStatus() const override {
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        return joystick->GetAnalog(axis_x, axis_y);
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    }
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private:
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    std::shared_ptr<SDLJoystick> joystick;
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    int axis_x;
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    int axis_y;
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};
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static std::shared_ptr<SDLJoystick> GetJoystick(int joystick_index) {
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    std::shared_ptr<SDLJoystick> joystick = joystick_list[joystick_index].lock();
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    if (!joystick) {
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        joystick = std::make_shared<SDLJoystick>(joystick_index);
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        joystick_list[joystick_index] = joystick;
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    }
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    return joystick;
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}
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/// A button device factory that creates button devices from SDL joystick
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class SDLButtonFactory final : public Input::Factory<Input::ButtonDevice> {
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public:
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    /**
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     * Creates a button device from a joystick button
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     * @param params contains parameters for creating the device:
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     *     - "joystick": the index of the joystick to bind
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     *     - "button"(optional): the index of the button to bind
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     *     - "hat"(optional): the index of the hat to bind as direction buttons
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     *     - "direction"(only used for hat): the direction name of the hat to bind. Can be "up",
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     *                                     "down", "left" or "right"
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     */
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    std::unique_ptr<Input::ButtonDevice> Create(const Common::ParamPackage& params) override {
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        const int joystick_index = params.Get("joystick", 0);
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        if (params.Has("hat")) {
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            const int hat = params.Get("hat", 0);
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            const std::string direction_name = params.Get("direction", "");
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            Uint8 direction;
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            if (direction_name == "up") {
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                direction = SDL_HAT_UP;
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            } else if (direction_name == "down") {
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                direction = SDL_HAT_DOWN;
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            } else if (direction_name == "left") {
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                direction = SDL_HAT_LEFT;
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            } else if (direction_name == "right") {
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                direction = SDL_HAT_RIGHT;
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            } else {
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                direction = 0;
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            }
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            return std::make_unique<SDLDirectionButton>(GetJoystick(joystick_index), hat,
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                                                        direction);
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        }
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        const int button = params.Get("button", 0);
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        return std::make_unique<SDLButton>(GetJoystick(joystick_index), button);
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    }
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};
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/// An analog device factory that creates analog devices from SDL joystick
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class SDLAnalogFactory final : public Input::Factory<Input::AnalogDevice> {
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public:
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    /**
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     * Creates analog device from joystick axes
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     * @param params contains parameters for creating the device:
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     *     - "joystick": the index of the joystick to bind
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     *     - "axis_x": the index of the axis to be bind as x-axis
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     *     - "axis_y": the index of the axis to be bind as y-axis
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     */
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    std::unique_ptr<Input::AnalogDevice> Create(const Common::ParamPackage& params) override {
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        const int joystick_index = params.Get("joystick", 0);
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        const int axis_x = params.Get("axis_x", 0);
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        const int axis_y = params.Get("axis_y", 1);
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        return std::make_unique<SDLAnalog>(GetJoystick(joystick_index), axis_x, axis_y);
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    }
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};
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void Init() {
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    if (SDL_Init(SDL_INIT_JOYSTICK) < 0) {
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        LOG_CRITICAL(Input, "SDL_Init(SDL_INIT_JOYSTICK) failed with: %s", SDL_GetError());
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    } else {
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        using namespace Input;
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        RegisterFactory<ButtonDevice>("sdl", std::make_shared<SDLButtonFactory>());
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        RegisterFactory<AnalogDevice>("sdl", std::make_shared<SDLAnalogFactory>());
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        initialized = true;
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    }
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}
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void Shutdown() {
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    if (initialized) {
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        using namespace Input;
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        UnregisterFactory<ButtonDevice>("sdl");
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        UnregisterFactory<AnalogDevice>("sdl");
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        SDL_QuitSubSystem(SDL_INIT_JOYSTICK);
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    }
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}
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} // namespace SDL
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} // namespace InputCommon
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										19
									
								
								src/input_common/sdl/sdl.h
									
									
									
									
									
										Normal file
									
								
							
							
						
						
									
										19
									
								
								src/input_common/sdl/sdl.h
									
									
									
									
									
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							@ -0,0 +1,19 @@
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// Copyright 2017 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include "core/frontend/input.h"
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namespace InputCommon {
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namespace SDL {
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/// Initializes and registers SDL device factories
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void Init();
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/// Unresisters SDL device factories and shut them down.
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void Shutdown();
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} // namespace SDL
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} // namespace InputCommon
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