1 files changed, 372 insertions, 0 deletions
diff --git a/src/common/input.h b/src/common/input.h
new file mode 100644
index 000000000..eaee0bdea
--- /dev/null
+++ b/src/common/input.h
@@ -0,0 +1,372 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <functional>
+#include <memory>
+#include <string>
+#include <unordered_map>
+#include <utility>
+#include "common/logging/log.h"
+#include "common/param_package.h"
+#include "common/uuid.h"
+
+namespace Common::Input {
+
+// Type of data that is expected to recieve or send
+enum class InputType {
+    None,
+    Battery,
+    Button,
+    Stick,
+    Analog,
+    Trigger,
+    Motion,
+    Touch,
+    Color,
+    Vibration,
+    Nfc,
+    Ir,
+};
+
+// Internal battery charge level
+enum class BatteryLevel : u32 {
+    None,
+    Empty,
+    Critical,
+    Low,
+    Medium,
+    Full,
+    Charging,
+};
+
+enum class PollingMode {
+    // Constant polling of buttons, analogs and motion data
+    Active,
+    // Only update on button change, digital analogs
+    Pasive,
+    // Enable near field communication polling
+    NFC,
+    // Enable infrared camera polling
+    IR,
+};
+
+// Vibration reply from the controller
+enum class VibrationError {
+    None,
+    NotSupported,
+    Disabled,
+    Unknown,
+};
+
+// Polling mode reply from the controller
+enum class PollingError {
+    None,
+    NotSupported,
+    Unknown,
+};
+
+// Hint for amplification curve to be used
+enum class VibrationAmplificationType {
+    Linear,
+    Exponential,
+};
+
+// Analog properties for calibration
+struct AnalogProperties {
+    // Anything below this value will be detected as zero
+    float deadzone{};
+    // Anyting above this values will be detected as one
+    float range{1.0f};
+    // Minimum value to be detected as active
+    float threshold{0.5f};
+    // Drift correction applied to the raw data
+    float offset{};
+    // Invert direction of the sensor data
+    bool inverted{};
+};
+
+// Single analog sensor data
+struct AnalogStatus {
+    float value{};
+    float raw_value{};
+    AnalogProperties properties{};
+};
+
+// Button data
+struct ButtonStatus {
+    Common::UUID uuid{};
+    bool value{};
+    bool inverted{};
+    bool toggle{};
+    bool locked{};
+};
+
+// Internal battery data
+using BatteryStatus = BatteryLevel;
+
+// Analog and digital joystick data
+struct StickStatus {
+    Common::UUID uuid{};
+    AnalogStatus x{};
+    AnalogStatus y{};
+    bool left{};
+    bool right{};
+    bool up{};
+    bool down{};
+};
+
+// Analog and digital trigger data
+struct TriggerStatus {
+    Common::UUID uuid{};
+    AnalogStatus analog{};
+    ButtonStatus pressed{};
+};
+
+// 3D vector representing motion input
+struct MotionSensor {
+    AnalogStatus x{};
+    AnalogStatus y{};
+    AnalogStatus z{};
+};
+
+// Motion data used to calculate controller orientation
+struct MotionStatus {
+    // Gyroscope vector measurement in radians/s.
+    MotionSensor gyro{};
+    // Acceleration vector measurement in G force
+    MotionSensor accel{};
+    // Time since last measurement in microseconds
+    u64 delta_timestamp{};
+    // Request to update after reading the value
+    bool force_update{};
+};
+
+// Data of a single point on a touch screen
+struct TouchStatus {
+    ButtonStatus pressed{};
+    AnalogStatus x{};
+    AnalogStatus y{};
+    int id{};
+};
+
+// Physical controller color in RGB format
+struct BodyColorStatus {
+    u32 body{};
+    u32 buttons{};
+};
+
+// HD rumble data
+struct VibrationStatus {
+    f32 low_amplitude{};
+    f32 low_frequency{};
+    f32 high_amplitude{};
+    f32 high_frequency{};
+    VibrationAmplificationType type;
+};
+
+// Physical controller LED pattern
+struct LedStatus {
+    bool led_1{};
+    bool led_2{};
+    bool led_3{};
+    bool led_4{};
+};
+
+// List of buttons to be passed to Qt that can be translated
+enum class ButtonNames {
+    Undefined,
+    Invalid,
+    // This will display the engine name instead of the button name
+    Engine,
+    // This will display the button by value instead of the button name
+    Value,
+    ButtonLeft,
+    ButtonRight,
+    ButtonDown,
+    ButtonUp,
+    TriggerZ,
+    TriggerR,
+    TriggerL,
+    ButtonA,
+    ButtonB,
+    ButtonX,
+    ButtonY,
+    ButtonStart,
+
+    // DS4 button names
+    L1,
+    L2,
+    L3,
+    R1,
+    R2,
+    R3,
+    Circle,
+    Cross,
+    Square,
+    Triangle,
+    Share,
+    Options,
+};
+
+// Callback data consisting of an input type and the equivalent data status
+struct CallbackStatus {
+    InputType type{InputType::None};
+    ButtonStatus button_status{};
+    StickStatus stick_status{};
+    AnalogStatus analog_status{};
+    TriggerStatus trigger_status{};
+    MotionStatus motion_status{};
+    TouchStatus touch_status{};
+    BodyColorStatus color_status{};
+    BatteryStatus battery_status{};
+    VibrationStatus vibration_status{};
+};
+
+// Triggered once every input change
+struct InputCallback {
+    std::function<void(CallbackStatus)> on_change;
+};
+
+/// An abstract class template for an input device (a button, an analog input, etc.).
+class InputDevice {
+public:
+    virtual ~InputDevice() = default;
+
+    // Request input device to update if necessary
+    virtual void SoftUpdate() {
+        return;
+    }
+
+    // Force input device to update data regardless of the current state
+    virtual void ForceUpdate() {
+        return;
+    }
+
+    // Sets the function to be triggered when input changes
+    void SetCallback(InputCallback callback_) {
+        callback = std::move(callback_);
+    }
+
+    // Triggers the function set in the callback
+    void TriggerOnChange(CallbackStatus status) {
+        if (callback.on_change) {
+            callback.on_change(status);
+        }
+    }
+
+private:
+    InputCallback callback;
+};
+
+/// An abstract class template for an output device (rumble, LED pattern, polling mode).
+class OutputDevice {
+public:
+    virtual ~OutputDevice() = default;
+
+    virtual void SetLED([[maybe_unused]] LedStatus led_status) {
+        return;
+    }
+
+    virtual VibrationError SetVibration([[maybe_unused]] VibrationStatus vibration_status) {
+        return VibrationError::NotSupported;
+    }
+
+    virtual PollingError SetPollingMode([[maybe_unused]] PollingMode polling_mode) {
+        return PollingError::NotSupported;
+    }
+};
+
+/// An abstract class template for a factory that can create input devices.
+template <typename InputDeviceType>
+class Factory {
+public:
+    virtual ~Factory() = default;
+    virtual std::unique_ptr<InputDeviceType> Create(const Common::ParamPackage&) = 0;
+};
+
+namespace Impl {
+
+template <typename InputDeviceType>
+using FactoryListType = std::unordered_map<std::string, std::shared_ptr<Factory<InputDeviceType>>>;
+
+template <typename InputDeviceType>
+struct FactoryList {
+    static FactoryListType<InputDeviceType> list;
+};
+
+template <typename InputDeviceType>
+FactoryListType<InputDeviceType> FactoryList<InputDeviceType>::list;
+
+} // namespace Impl
+
+/**
+ * Registers an input device factory.
+ * @tparam InputDeviceType the type of input devices the factory can create
+ * @param name the name of the factory. Will be used to match the "engine" parameter when creating
+ *     a device
+ * @param factory the factory object to register
+ */
+template <typename InputDeviceType>
+void RegisterFactory(const std::string& name, std::shared_ptr<Factory<InputDeviceType>> factory) {
+    auto pair = std::make_pair(name, std::move(factory));
+    if (!Impl::FactoryList<InputDeviceType>::list.insert(std::move(pair)).second) {
+        LOG_ERROR(Input, "Factory '{}' already registered", name);
+    }
+}
+
+/**
+ * Unregisters an input device factory.
+ * @tparam InputDeviceType the type of input devices the factory can create
+ * @param name the name of the factory to unregister
+ */
+template <typename InputDeviceType>
+void UnregisterFactory(const std::string& name) {
+    if (Impl::FactoryList<InputDeviceType>::list.erase(name) == 0) {
+        LOG_ERROR(Input, "Factory '{}' not registered", name);
+    }
+}
+
+/**
+ * Create an input device from given paramters.
+ * @tparam InputDeviceType the type of input devices to create
+ * @param params a serialized ParamPackage string that contains all parameters for creating the
+ * device
+ */
+template <typename InputDeviceType>
+std::unique_ptr<InputDeviceType> CreateDeviceFromString(const std::string& params) {
+    const Common::ParamPackage package(params);
+    const std::string engine = package.Get("engine", "null");
+    const auto& factory_list = Impl::FactoryList<InputDeviceType>::list;
+    const auto pair = factory_list.find(engine);
+    if (pair == factory_list.end()) {
+        if (engine != "null") {
+            LOG_ERROR(Input, "Unknown engine name: {}", engine);
+        }
+        return std::make_unique<InputDeviceType>();
+    }
+    return pair->second->Create(package);
+}
+
+/**
+ * Create an input device from given paramters.
+ * @tparam InputDeviceType the type of input devices to create
+ * @param A ParamPackage that contains all parameters for creating the device
+ */
+template <typename InputDeviceType>
+std::unique_ptr<InputDeviceType> CreateDevice(const Common::ParamPackage package) {
+    const std::string engine = package.Get("engine", "null");
+    const auto& factory_list = Impl::FactoryList<InputDeviceType>::list;
+    const auto pair = factory_list.find(engine);
+    if (pair == factory_list.end()) {
+        if (engine != "null") {
+            LOG_ERROR(Input, "Unknown engine name: {}", engine);
+        }
+        return std::make_unique<InputDeviceType>();
+    }
+    return pair->second->Create(package);
+}
+
+} // namespace Common::Input