InputCommon: add SDL joystick support
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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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@ -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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